B72220R2321K101

## **SIOV Metal Oxide Varistors** 

## ThermoFuse Varistors, NT series 

**Series/Type: NT20 series Ordering code: B72220W/R*** Date: 2018-10-09 Version: c 

>  TDK Electronics AG 2018. Reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without TDK Electronics' prior express consent is prohibited. 

**SIOV Metal Oxide Varistors ThermoFuse Varistors, NT series** 

**B72220W/R* NT20 series** 

## **Construction** 

- Round varistor element, leaded 

- Coating: epoxy resin, flame-retardant to UL 94 V-0 

- Terminals: tinned copper wire, metal compound wire 

## **Features** 

- Wide operating voltage range 130 ...750VRMS 

- Self-protected under abnormal overvoltage conditions 

- High-energy AdvanceD series E2 

- UL approval to UL 1449,4[th] edition, type 4CA(File number E321126) 

- IEC 61051-2-2 certification 

- VDE certification (certificate number 40031102） 

## **Applications** 

- Home appliances 

- Power supplies 

- Inverters 

- Photovoltaic inverters 

- Drives 

- Lighting applications 

- Communication and data systems 

- Smart meters 

## **General technical data** 

|**Climatic category                    to IEC 60068-1**<br>**Operating temperature**<br>**Storage temperature**<br>**Electric strength**<br>**Insulation resistance**<br>**Response time**|**40/85/56**<br>**-40…+85**<br>**-40... +85**<br>≥**2.5**<br>≥**100**<br>**< 25**|**°C**<br>**°C**<br>**kVRMS**<br>**M**Ω<br>**ns**|
|---|---|---|



## **Nomenclature** 

- NT =         Series designation 20 =         Rated disk diameter (mm) K =         Tolerance of VV at 1 mA: ± 10% *** =         Max. AC voltage E2       =         Energy absorption characteristics, AdvanceD series S5       =         Crimp design S5 K4       =         2 leads version 

2018-10-09 

PPD VAR PD 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document . 

Page 2 of 19 

**SIOV Metal Oxide Varistors B72220W/R* ThermoFuse Varistors, NT series NT20 series** 

## **Dimensional drawings in mm** 

**==> picture [327 x 11] intentionally omitted <==**

**----- Start of picture text -----**<br>
Straight leads Kinked version<br>**----- End of picture text -----**<br>


**==> picture [431 x 568] intentionally omitted <==**

**----- Start of picture text -----**<br>
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2018-10-09 

PPD VAR PD 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document . 

Page 3 of 19 

**SIOV Metal Oxide Varistors** 

**B72220W/R* NT20 series** 

## **ThermoFuse Varistors, NT series** 

## **Dimension** 

|**Dimension**<br>~~1)~~|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Ordering code~~1)~~|Type<br>（untaped）<br>-SIOV|wmax<br> <br>mm|hmax<br> <br>mm|thmax<br>mm|e<br>±1<br>mm|e1<br>±1<br>mm|e2<br>±1<br>mm|e3<br>±1<br>mm|Lmin<br>mm|L1min<br>mm|∅d<br>±0.05<br>mm|∅d1<br>±0.05<br>mm|
|B72220W2131K101*<br>~~pO~~|NT20K130E2<br>~~pO~~|23<br>~~pO~~|28<br>~~pO~~|9.0|7.5|2.6|5|1|25|6|0.8|0.8|
|B72220R2131K101*<br>~~pO~~<br>~~po~~|NT20K130E2K4<br>~~pO~~<br>~~po~~|23<br>~~pO~~<br>~~po~~|28<br>~~pO~~<br>~~po~~||7.5|2.6|/|/|25|/|0.8|/|
|B72220W2141K101*<br>~~po~~<br>~~po~~|NT20K140E2<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|28<br>~~po~~<br>~~po~~||7.5|2.7|5|1|25|6|0.8|0.8|
|B72220R2141K101*<br>~~po~~|NT20K140E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|2.7|/|/|25|/|0.8|/|
|B72220W2151K101*<br>~~po~~|NT20K150E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|2.8|5|1|25|6|0.8|0.8|
|B72220R2151K101*<br>~~po~~<br>~~po~~|NT20K150E2K4<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|28<br>~~po~~<br>~~po~~||7.5|2.8|/|/|25|/|0.8|/|
|B72220W2171K101*<br>~~po~~|NT20K175E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|2.8|5|1|25|6|0.8|0.8|
|B72220R2171K101*<br>~~po~~|NT20K175E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|2.8|/|/|25|/|0.8|/|
|B72220W2211K101*<br>~~po~~<br>~~po~~|NT20K210E2<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|28<br>~~po~~<br>~~po~~|9.5|7.5|2.9|5|1|25|6|0.8|0.8|
|B72220R2211K101*<br>~~po~~<br>~~po~~|NT20K210E2K4<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|28<br>~~po~~<br>~~po~~||7.5|2.9|/|/|25|/|0.8|/|
|B72220W2251K101*<br>~~po~~|NT20K250E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|3.1|5|1|25|6|0.8|0.8|
|B72220R2251K101*<br>~~po~~<br>~~po~~|NT20K250E2K4<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|28<br>~~po~~<br>~~po~~||7.5|3.1|/|/|25|/|0.8|/|
|B72220W2271K101*<br>~~po~~<br>~~po~~|NT20K275E2<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|28<br>~~po~~<br>~~po~~||7.5|3.2|5|1|25|6|0.8|0.8|
|B72220R2271K101*<br>~~po~~|NT20K275E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|3.2|/|/|25|/|0.8|/|
|B72220W2301K101*<br>~~pO~~|NT20K300E2<br>~~pO~~|23<br>~~pO~~|28<br>~~pO~~|11.0|7.5|3.3|5|1|25|6|0.8|0.8|
|B72220R2301K101*<br>~~pO~~<br>~~po~~|NT20K300E2K4<br>~~pO~~<br>~~po~~|23<br>~~pO~~<br>~~po~~|28<br>~~pO~~<br>~~po~~||7.5|3.3|/|/|25|/|0.8|/|
|B72220W2321K101*<br>~~po~~<br>~~po~~|NT20K320E2<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|28<br>~~po~~<br>~~po~~||7.5|3.5|5|1|25|6|0.8|0.8|
|B72220R2321K101*<br>~~po~~|NT20K320E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|3.5|/|/|25|/|0.8|/|
|B72220W2351K101*<br>~~po~~|NT20K350E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|3.7|5|1|25|6|0.8|0.8|
|B72220R2351K101*<br>~~po~~|NT20K350E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|3.7|/|/|25|/|0.8|/|
|B72220W2381K101*<br>~~po~~|NT20K385E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|4.0|5|1|25|6|0.8|0.8|
|B72220R2381K101*<br>~~po~~|NT20K385E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|4.0|/|/|25|/|0.8|/|
|B72220W2421K101*<br>~~po~~|NT20K420E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|4.2|5|1|25|6|0.8|0.8|
|B72220R2421K101*<br>~~po~~|NT20K420E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|4.2|/|/|25|/|0.8|/|
|B72220W2461K101*<br>~~po~~|NT20K460E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|4.4|5|1|25|6|1.0|0.8|
|B72220R2461K101*<br>~~po~~|NT20K460E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|4.4|/|/|25|/|1.0|/|
|B72220W2511K101*<br>~~po~~|NT20K510E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~|12.0|7.5|4.5|5|1|25|6|1.0|0.8|
|B72220R2511K101*<br>~~po~~|NT20K510E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|4.5|/|/|25|/|1.0|/|
|B72220W2551K101*<br>~~po~~|NT20K550E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|4.7|5|1|25|6|1.0|0.8|
|B72220R2551K101*<br>~~po~~|NT20K550E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|4.7|/|/|25|/|1.0|/|
|B72220W2621K101*<br>~~po~~|NT20K625E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~|13.0|7.5|5.0|5|1|25|6|1.0|0.8|
|B72220R2621K101*<br>~~po~~|NT20K625E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|5.0|/|/|25|/|1.0|/|
|B72220W2681K101*<br>~~po~~|NT20K680E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|5.5|5|1|25|6|1.0|0.8|
|B72220R2681K101*<br>~~po~~|NT20K680E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|5.5|/|/|25|/|1.0|/|
|B72220W2751K101*<br>~~po~~|NT20K750E2<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|6.0|5|1|25|6|1.0|0.8|
|B72220R2751K101*<br>~~po~~|NT20K750E2K4<br>~~po~~|23<br>~~po~~|28<br>~~po~~||7.5|6.0|/|/|25|/|1.0|/|



1）*May be suffix -V87: CCS wire for leads 

2018-10-09 

PPD VAR PD 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document . 

Page 4 of 19 

**SIOV Metal Oxide Varistors ThermoFuse Varistors, NT series** 

**B72220W/R* NT20 series** 

|~~1)~~|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|Ordering code~~1)~~|Type<br>（untaped）<br>-SIOV|wmax<br> <br>mm|hmax<br> <br>mm|thmax<br>mm|e<br>±1<br>mm|e1<br>±1<br>mm|e2<br>±1<br>mm|e3<br>±1<br>mm|Lmin<br>mm|L1min<br>mm|∅d<br>±0.05<br>mm|∅d1<br>±0.05<br>mm|
|B72220W2131K501*<br>~~po~~<br>~~po~~|NT20K130E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~|9.0|7.5|2.6|5|1|25|6|0.8|0.8|
|B72220R2131K501*<br>~~po~~|NT20K130E2S5K4|23|31||7.5|2.6|/|/|25|/|0.8|/|
|B72220W2141K501*<br>~~po~~<br>~~po~~|NT20K140E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|2.7|5|1|25|6|0.8|0.8|
|B72220R2141K501*<br>~~po~~<br>~~po~~|NT20K140E2S5K4<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|2.7|/|/|25|/|0.8|/|
|B72220W2151K501*<br>~~po~~|NT20K150E2S5|23|31||7.5|2.8|5|1|25|6|0.8|0.8|
|B72220R2151K501*<br>~~po~~<br>~~po~~|NT20K150E2S5K4<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|2.8|/|/|25|/|0.8|/|
|B72220W2171K501*<br>~~po~~<br>~~po~~<br>~~po~~|NT20K175E2S5<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|31<br>~~po~~<br>~~po~~||7.5|2.8|5|1|25|6|0.8|0.8|
|B72220R2171K501*<br>~~po~~|NT20K175E2S5K4|23|31||7.5|2.8|/|/|25|/|0.8|/|
|B72220W2211K501*<br>~~po~~<br>~~pO~~|NT20K210E2S5<br>~~pO~~|23<br>~~pO~~|31<br>~~pO~~|9.5|7.5|2.9|5|1|25|6|0.8|0.8|
|B72220R2211K501*<br>~~pO~~<br>~~po~~|NT20K210E2S5K4<br>~~pO~~<br>~~po~~|23<br>~~pO~~<br>~~po~~|31<br>~~pO~~<br>~~po~~||7.5|2.9|/|/|25|/|0.8|/|
|B72220W2251K501*<br>~~po~~<br>~~po~~|NT20K250E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|3.1|5|1|25|6|0.8|0.8|
|B72220R2251K501*<br>~~po~~|NT20K250E2S5K4|23|31||7.5|3.1|/|/|25|/|0.8|/|
|B72220W2271K501*<br>~~po~~<br>~~po~~|NT20K275E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|3.2|5|1|25|6|0.8|0.8|
|B72220R2271K501*<br>~~po~~|NT20K275E2S5K4<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|3.2|/|/|25|/|0.8|/|
|B72220W2301K501*<br>~~po~~|NT20K300E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~|11.0<br>~~es~~|7.5|3.3|5|1|25|6|0.8|0.8|
|B72220R2301K501*<br>~~po~~<br>~~po~~|NT20K300E2S5K4<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|31<br>~~po~~<br>~~po~~||7.5|3.3|/|/|25|/|0.8|/|
|B72220W2321K501*<br>~~po~~<br>~~po~~<br>~~po~~|NT20K320E2S5<br>~~po~~<br>~~po~~|23<br>~~po~~<br>~~po~~|31<br>~~po~~<br>~~po~~||7.5|3.5|5|1|25|6|0.8|0.8|
|B72220R2321K501*<br>~~po~~|NT20K320E2S5K4|23|31||7.5|3.5|/|/|25|/|0.8|/|
|B72220W2351K501*<br>~~po~~<br>~~po~~|NT20K350E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|3.7|5|1|25|6|0.8|0.8|
|B72220R2351K501*<br>~~po~~|NT20K350E2S5K4<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|3.7|/|/|25|/|0.8|/|
|B72220W2381K501*<br>~~po~~<br>~~po~~|NT20K385E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|4.0|5|1|25|6|0.8|0.8|
|B72220R2381K501*<br>~~po~~|NT20K385E2S5K4|23|31||7.5|4.0|/|/|25|/|0.8|/|
|B72220W2421K501*<br>~~po~~<br>~~po~~|NT20K420E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|4.2|5|1|25|6|0.8|0.8|
|B72220R2421K501*<br>~~po~~|NT20K420E2S5K4<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|4.2|/|/|25|/|0.8|/|
|B72220W2461K501*<br>~~po~~<br>~~GO~~|NT20K460E2S5<br>~~po~~<br>~~GO~~|23<br>~~po~~<br>~~GO~~|31<br>~~po~~<br>~~GO~~||7.5<br>~~GO~~|4.4<br>~~GO GO~~|5<br>~~GO~~|1<br>~~GO~~|25<br>~~GO~~|6<br>~~GO~~|1.0<br>~~GO~~|0.8<br>~~GO~~|
|B72220R2461K501*<br>~~GO~~|NT20K460E2S5K4<br>~~GO~~|23<br>~~GO~~|31<br>~~GO~~||7.5<br>~~GO~~|4.4<br>~~GO GO~~|/<br>~~GO~~|/<br>~~GO~~|25<br>~~GO~~|/<br>~~GO~~|1.0<br>~~GO~~|/<br>~~GO~~|
|B72220W2511K501*<br>~~GO~~<br>~~po~~|NT20K510E2S5<br>~~GO~~<br>~~po~~|23<br>~~GO~~<br>~~po~~|31<br>~~GO ~~<br>~~po~~|12.0<br> ~~es ~~|7.5<br> ~~GO~~|4.5<br>~~GO GO~~|5<br>~~GO~~|1<br>~~GO~~|25<br>~~GO~~|6<br>~~GO~~|1.0<br>~~GO~~|0.8<br>~~GO~~|
|B72220R2511K501*<br>~~po~~<br>~~po~~|NT20K510E2S5K4<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|4.5|/|/|25|/|1.0|/|
|B72220W2551K501*<br>~~po~~|NT20K550E2S5|23|31||7.5|4.7|5|1|25|6|1.0|0.8|
|B72220R2551K501*<br>~~po~~<br>~~po~~|NT20K550E2S5K4<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|4.7|/|/|25|/|1.0|/|
|B72220W2621K501*<br>~~po~~<br>~~po~~|NT20K625E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~|13.0|7.5|5.0|5|1|25|6|1.0|0.8|
|B72220R2621K501*<br>~~po~~|NT20K625E2S5K4|23|31||7.5|5.0|/|/|25|/|1.0|/|
|B72220W2681K501*<br>~~po~~<br>~~po~~|NT20K680E2S5<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|5.5|5|1|25|6|1.0|0.8|
|B72220R2681K501*<br>~~po~~<br>~~po~~|NT20K680E2S5K4<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|5.5|/|/|25|/|1.0|/|
|B72220W2751K501*<br>~~po~~|NT20K750E2S5|23|31||7.5|6.0|5|1|25|6|1.0|0.8|
|B72220R2751K501*<br>~~po~~<br>~~po~~|NT20K750E2S5K4<br>~~po~~|23<br>~~po~~|31<br>~~po~~||7.5|6.0|/|/|25|/|1.0|/|



1）*May be suffix -V87: CCS wire for leads 

2018-10-09 

PPD VAR PD 

Please read _Cautions and warnings_ and _Important notes_ at the end of this document . 

Page 5 of 19 

~~LO~~ **SIOV Metal Oxide Varistors B72220W/R* ThermoFuse Varistors, NT series NT20 series** 

## **Electrical data** 

Maximum ratings (85 °C): 

|||||~~2)~~|||
|---|---|---|---|---|---|---|
|Type<br>（untaped）<br>-SIOV|VRMS<br>V|VDC<br>V|imax<br>(8/20 µs)<br>A|In~~2)~~<br> (8/20 µs)<br>15 times<br>A|Wmax<br>(2 ms)<br>J|Pmax<br>W|
|NT20K130E2*<br>~~a~~<br>~~es~~|130|170|10000|5000|100|1.0|
|NT20K140E2*<br>~~es~~|140|180|10000|5000|110|1.0|
|NT20K150E2*<br>~~es~~<br>~~es~~|150<br>~~es~~|200<br>~~es~~|10000<br>~~es~~|5000<br>~~es~~|120<br>~~es~~|1.0<br>~~es~~|
|NT20K175E2*<br>~~a~~|175<br>|225<br>|10000<br>|5000<br>|135<br>|1.0<br>|
|NT20K210E2*<br>~~es~~|210<br>~~es~~|270<br>~~es~~|10000<br>~~es~~|5000<br>~~es~~|160<br>~~es~~|1.0<br>~~es~~|
|NT20K250E2*<br>~~es~~|250<br>~~es~~|320<br>~~es~~|10000<br>~~es~~|5000<br>~~es~~|195<br>~~es~~|1.0<br>~~es~~|
|NT20K275E2*<br>~~a~~|275<br>|350<br>|10000<br>|5000<br>|215<br>|1.0<br>|
|NT20K300E2*<br>~~es~~|300<br>~~es~~|385<br>~~es~~|10000<br>~~es~~|5000<br>~~es~~|250<br>~~es~~|1.0<br>~~es~~|
|NT20K320E2*<br>~~se~~|320<br>~~se~~|420<br>~~se~~|10000<br>~~se~~|5000<br>~~se~~|273<br>~~se~~|1.0<br>~~se~~|
|NT20K350E2*<br>~~se~~|350<br>~~se~~|460<br>~~se~~|10000<br>~~se~~|5000<br>~~se~~|200<br>~~se~~|1.0<br>~~se~~|
|NT20K385E2*<br>~~a~~|385|505|10000|5000|273|1.0|
|NT20K420E2*<br>~~es~~|420<br>~~es~~|560<br>~~es~~|10000<br>~~es~~|5000<br>~~es~~|273<br>~~es~~|1.0<br>~~es~~|
|NT20K460E2*<br>~~es~~|460<br>~~es~~|615<br>~~es~~|10000<br>~~es~~|5000<br>~~es~~|300<br>~~es~~|1.0<br>~~es~~|
|NT20K510E2*<br>~~a~~|510|670|10000|5000|325|1.0|
|NT20K550E2*<br>~~es~~|550<br>~~es~~|745<br>~~es~~|10000<br>~~es~~|5000<br>~~es~~|360<br>~~es~~|1.0<br>~~es~~|
|NT20K625E2*<br>~~a~~|625|825|10000|5000|400|1.0|
|NT20K680E2*<br>~~se~~|680<br>~~se~~|895<br>~~se~~|10000<br>~~se~~|5000<br>~~se~~|440<br>~~se~~|1.0<br>~~se~~|
|NT20K750E2*<br>~~es~~|750<br>~~es~~|1060<br>~~es~~|10000<br>~~es~~|3000<br>~~es~~|480<br>~~es~~|1.0<br>~~es~~|



*May be suffix S5, K4 

2) Note: 

Nominal discharge current is the specification defined in UL1449 4[th] edition and tested with 8/20 µs current waveform. 

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~~LO~~ **SIOV Metal Oxide Varistors B72220W/R* ThermoFuse Varistors, NT series NT20 series** 

## Characteristics (25 °C): 

|Type|VV<br>(1 mA)<br>V|△Vv<br>(1 mA )<br>%|Vc,max<br>ic<br>V|ic<br>A|Ctyp<br>1 kHz<br>pF|
|---|---|---|---|---|---|
|NT20K130E2*<br>~~a~~|205|10|340|100|1850|
|NT20K140E2*<br>~~a~~|220|10|360|100|1700|
|NT20K150E2*<br>~~a~~|240<br>|10<br>|395<br>|100<br>|1550<br>|
|NT20K175E2*<br>~~ee~~|270<br>~~ee~~|10<br>~~ee~~|455<br>~~ee~~|100<br>~~ee~~|1350<br>~~ee~~|
|NT20K210E2*<br>~~a~~<br>~~Re~~|330|10|545|100|1100|
|NT20K250E2*<br>~~Re~~|390|10|650|100|940|
|NT20K275E2*<br>~~Re~~<br>~~a~~<br>~~a~~|430<br>|10<br>|710<br>|100<br>~~ee~~<br>|850<br>|
|NT20K300E2*<br>~~a ~~<br>~~a~~|470<br> ~~ee~~<br>|10<br>~~ee~~<br>|775<br>~~ee~~<br>|100<br>~~ee~~<br>~~ee~~<br>|780<br>~~ee~~<br>|
|NT20K320E2*<br>~~a ~~|510<br> ~~ee~~|10<br>~~ee~~|840<br>~~ee~~|100<br>~~ee~~<br>~~ee~~|720<br>~~ee~~|
|NT20K350E2*<br>~~a~~|560|10|910|100|660|
|NT20K385E2*<br>~~a~~|620|10|1025|100|600|
|NT20K420E2*<br>~~a~~|680|10|1120|100|550|
|NT20K460E2*<br>~~a ~~|750<br> ~~ee~~|10<br>~~ee~~|1240<br>~~ee~~|100<br>~~ee~~|500<br>~~ee~~|
|NT20K510E2*<br>~~a~~|820|10|1355|100|460|
|NT20K550E2*<br>~~a~~|910|10|1500|100|410|
|NT20K625E2*<br>~~a~~|1000|10|1650|100|380|
|NT20K680E2*<br>~~a~~|1100|10|1815|100|340|
|NT20K750E2*<br>~~a~~|1200|10|2000|100|250|



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**SIOV Metal Oxide Varistors ThermoFuse Varistors, NT series** 

**B72220W/R* NT20 series** 

## **Reliability data** 

|**Reliability data**|||
|---|---|---|
|**Test**|**Test methods**|**Requirement**|
|Varistor<br>voltage|The voltage between two terminals with the specified<br>measuring current applied is called Vv(1 mADC@ 0.2 … 2 s).|To meet the specified<br>value.|
|Clamping<br>voltage|The maximum voltage between two terminals with the<br>specified standard impulse current  (8/20 µs) illustrated below<br>applied.<br>*<br>Pesk<br>100}<br>-~------pyog-—<br>90+-------4<br>i<br>Leading<br>|<br>Ede<br>TrailingEdge<br>50}-----<br>;<br>it}<br>o<br>oo<br>it<br>I<br>Ts<br>RiseTire ps<br>Te<br>Decaytime<br>tohalfvalueys<br>©:<br>Nominalstart<br>Im<br>Peakvalue|To meet the specified<br>value.|
|Surge current<br>derating,<br>8/20 µs|10 surge currents (8/20 µs), unipolar, interval 30 s, amplitude<br>corresponding to derating curve for 10 impulses at 20 µs||△V/V (1 mA)|≤10%<br>(measured in direction<br>of surge current)<br>No visible damage|
|Surge current<br>derating,<br>2 ms|10 surge currents (2 ms), unipolar, interval 120 s, amplitude<br>corresponding to derating curve for 10 impulses at 2 ms||△V/V (1 mA)|≤10%<br>(measured in direction<br>of surge current)<br>No visible damage|



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**SIOV Metal Oxide Varistors ThermoFuse Varistors, NT series** 

**B72220W/R* NT20 series** 

## **Reliability data** 

|**Reliability data**|||
|---|---|---|
|**Characteristics**|**Test methods/Description**|**Specifications**|
|Tensile strength|IEC 60068-2-21, test Ua1<br>After gradually applying the force specified below<br>and keeping the unit fixed for 10 s, the terminal shall<br>be visually examined for any damage.<br>Force for wire diameter:<br>0.6 mm = 10 N<br>0.8 mm = 10 N<br>1.0 mm = 20 N||△V/V (1 mA)|≤5%<br>No break of solder<br>joint, no wire break|
|Vibration|IEC 60068-2-6, test Fc, method B4<br>Frequency range:<br>10 ... 55 Hz<br>Amplitude:<br>0.75 mm or 98 m/s²<br>Duration:<br>6 h (3 x 2 h)<br>Pulse:<br>sine wave<br>After repeatedly applying a single harmonic vibration<br>according to the table above, the change of Vvshall<br>be measured and the part shall be visually<br>examined.||△V/V (1 mA)|≤5%<br>No visible damage|
|Solderability|IEC 60068-2-20, test Ta,<br>method 1 with modified conditions for lead-free<br>solder alloys: 245 °C, 3 s:<br>After dipping the terminals to a depth of<br>approximately 3 mm from the body in a soldering<br>bath of 245 °C for 3 s, the terminals shall be visually<br>examined.|The inspection shall<br>be carried out under<br>adequate light with<br>normal eyesight or<br>with the assistance of<br>a magnifier capable of<br>giving a magnification<br>of 4 to 10 times. The<br>dipped surface shall<br>be covered with a<br>smooth and bright<br>solder coating with no<br>more than small<br>amounts of scattered<br>imperfections such as<br>pinholes or un-wetted<br>or de-wetted areas.<br>These imperfections<br>shall not be<br>concentrated in one<br>area.|



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**SIOV Metal Oxide Varistors** 

**B72220W/R* NT20 series** 

**ThermoFuse Varistors, NT series** 

|**Characteristics**|**Test methods/Description**|**Specifications**|
|---|---|---|
|Resistance to<br>soldering heat|IEC 60068-2-20, test Tb, method 1A, 260 °C, 10 s:<br>Each lead shall be dipped into a solder bath having a<br>temperature of 260±5 °C to a point 2.0 to 2.5 mm<br>from the body of the unit, be held there for 10±1 s<br>and then be stored at room temperature and normal<br>humidity for 1 to 2 hours. The change of Vvshall be<br>measured and the part shall be visually examined.||△V/V (1 mA)|≤5%<br>No visible damage|
|Bump|IEC 60068-2-27,Test Eb<br>Pulse duration:<br>6 ms<br>Max. acceleration:<br>400 m/s2<br>Number of bumps:<br>6×4000<br>Pulse:<br>half sine||△V/V (1 mA)|≤5%<br>No visible damage|
|Fire hazard|IEC 60695-11-5 (needle flame test)<br>Severity: vertical 10 s|5 s max.|
|Electric strength|IEC 61051-1, test 4.9.2<br>Metal balls method, 2500 VRMS, 60 s<br>The varistor is placed in a container holding 1.6±0.2<br>mm diameter metal balls such that only the<br>terminations of the varistor are protruding.<br>The specified voltage shall be applied between both<br>terminals of the specimen connected together and<br>the electrode inserted between the metal balls.|No breakdown|



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**SIOV Metal Oxide Varistors** 

**B72220W/R* NT20 series** 

**ThermoFuse Varistors, NT series** 

## **Reliability data** 

|**Characteristics**<br>~~OC~~|**Test methods/Description**<br>~~OC~~|**Specifications**|
|---|---|---|
|Endurance at upper<br>category<br>temperature<br>~~OC~~|IEC61051-2-2, 1000 h at UCT<br>After having continuously applied the maximum<br>allowable AC voltage at UCT ±2 °C for 1000 h, the<br>specimen shall be stored at room temperature and<br>normal humidity for 1 to 2 h.<br>Thereafter, the change of Vvshall be measured.<br>~~OC~~||△V/V (1 mA)|≤10%|
|Damp heat, steady<br>state|IEC 60068-2-78, test Ca<br>The specimen shall be subjected to 40±2 °C, 90 to<br>95 % r.H. for 56 days without load / with 10% of the<br>maximum continuous DC operating voltage VDC.<br>Then stored at room temperature and normal<br>humidity for 1 to 2 h.<br>Thereafter, the change of Vvshall be measured.<br>Thereafter, insulation resistance Rinsshall be<br>measured at V = 500 V(insulated varistors only).||△V/V (1 mA)|≤10%<br>Rinse100 M&|
|Climatic sequence|The specimen shall be subjected to:<br>a) IEC 60068-2-2, test Ba, dry heat at UCT, 16 h<br>b) IEC 60068-2-30, test Db, damp heat, 1st cycle:<br>55 °C, 93% r.H., 24 h<br>c) IEC 60068-2-1, test Aa, cold, LCT, 2 h<br>d) IEC 60068-2-30, test Db, damp heat, additional 5<br>cycles: 55 °C/25 °C, 93% r.H., 24 h/cycle.<br>Then the specimen shall be stored at room<br>temperature and normal humidity for 1 to 2 h.<br>Thereafter, the change of Vvshall be measured.<br>Thereafter, insulation resistance Rinsshall be<br>measured at V = 500 V.||△V/V (1 mA)|≤10%<br>Rinse100 M&|
|Rapid change of<br>temperature|IEC 60068-2-14, test Na, LCT/UCT, dwell time 30<br>min, 5 cycles||△V/V (1 mA)|≤5%<br>No visible damage|



## **Note:** 

UCT = Upper category temperature 

LCT = Lower category temperature 

Rins = Insulation resistance 

All electrical tests should be performed between terminal pin1 and pin3. 

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## ~~Fe~~ **SIOV Metal Oxide Varistors B72220W/R*** ~~_ ———_____~~ **ThermoFuse Varistors, NT series NT20 series** 

## **v/i characteristic** 

A = Leakage current, B = Protection level } for worst-case varistor tolerances 

## NT20K130...750 

**==> picture [488 x 362] intentionally omitted <==**

**----- Start of picture text -----**<br>
5000<br>V V<br>4000<br>ee<br>A B<br>Se<br>2000<br>sea<br>750<br>CE 680 625 el<br>550<br>1000 750 510<br>460<br>800 || 680 625 420 ere<br>385<br>[a 550 510 SSreSeay 350 SS Serer | |<br>600 ee 320 300<br>460 420 a ee<br>275<br>250<br>ae 385 350 ee ee eaeeee eee<br>210<br>400 320 300<br>BS 275 250 175<br>150<br>210 140 130<br>See SS eer<br>175<br>200 150<br>140 130<br>aor Feit tt tt ye<br>=43 -T} || |] tt] Tt tt qt ty<br>100 PP EP<br>80 a<br>60 a<br>50 aee ee ee ee ee ee<br>-5 -4 -3 -2 -1 0 1 2 3 4 A 5<br>10 10 10 10 10 10 10 10 10 10 10<br>—_=> I<br>**----- End of picture text -----**<br>


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**SIOV Metal Oxide Varistors** 

**B72220W/R* NT20 series** 

## **ThermoFuse Varistors, NT series** 

## **Derating curves** 

Suitable for 130E2 -320E2 

**==> picture [426 x 558] intentionally omitted <==**

**----- Start of picture text -----**<br>
100000 NT20K130…320E2<br>LS RS RS SS SS A<br>LS| i m a x .<br>tr<br>10000<br>I ISOA SO OO<br>[p+ 1 x  +4—_+_—_—___|_|+<br>1000 S 2 x  S eee eee<br>a 15 x<br>a a 10^2 x  a<br>| 5 —_| 10^3 x  — eS<br>100<br>10^4 x<br>a eS 10^5 x<br>10^6 x<br>inf.<br>10 po | |EEE<br>SSS—————————————————eeeeeeeeeeeEEEASSS SS Ee eeESE eee ee ee,<br>a<br>1<br>SSLS SS SS ASSSSSSLS ASSSSS SS eSSS eS SSSS SS SS OS A SSSS LS eS SS SS SS SN SO SS<br>SS RS RS OR SS RS SS EF OSS RS QS SS OS<br>a<br>0,1<br>10 100 1000 10000<br>t r  [μs]<br>NT20K350..NT20K680E2<br>100000<br>a<br>SSSS ASSSSRS SSES A SSSS eS SSES ST SS SS SS SS SSCe | i m a x .<br>SS RSSOI<br>tr<br>10000<br>SS——a OSSerer RS SS I SS ES SSer<br>a|SeaSoene| aes 1 x   eeee aee Baee eea  eeeeee eeee<br>1000 tg | |_| | 2 x  |<br>15 x<br>_——————re a, eS|OSee SE ee ee ee eeerr<br>10^2 x<br>100 jp 10^3 x  ER<br>aSS 10^4 x 10^5 x<br>[$$] a 10^6 x inf.<br>10<br>e e Eeee<br>SS SS SS SS ee ee<br>eS<br>a SO 0 OC ee ee<br>1<br>10 100 1000 10000<br>t r  [μs]<br>I max [A]<br>I max [A]<br>**----- End of picture text -----**<br>


## Suitable for 350E2 -680E2 

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**SIOV Metal Oxide Varistors** 

**B72220W/R* NT20 series** 

## **ThermoFuse Varistors, NT series** 

Suitable for 750E2 

**==> picture [426 x 262] intentionally omitted <==**

**----- Start of picture text -----**<br>
NT20K750E2<br>100000 ——SSSSSS<br>LSASS RS SS A  SOG S SS S S A SSA A SS  eSSS SS SS SSOOOO SS SS CSSe | i m a x .<br>tr<br>10000<br>SS<br>a<br>ee Se a a a a a ee ee ee<br>pf 1 x  EE EHH<br>1000 eSEE 2 x  eee<br>SSSS————Eemeee,TT oSaEe SSNS SSS S  SSee 15 x  SSSRS SS NS SSS S  SSSOee eeeES SSeeer ASeeeOSAS ON<br>10^2 x<br>100 jp ET 10^3 x<br>10^4 x<br>SSS SS 10^5 x   ||<br>10 ESaD SS 10^6 x inf.  ee<br>aSS SS A eeSS e e eo ee ee e S eeee<br>A<br>a A<br>OO Os OO<br>1<br>10 100 1000 10000<br>t r  [μs]<br>I max [A]<br>**----- End of picture text -----**<br>


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**SIOV Metal Oxide Varistors** 

**B72220W/R* NT20 series** 

**ThermoFuse Varistors, NT series** 

## **Soldering instructions only for NT series** 

## **Manual soldering** 

Maximum soldering temperature 350 °C for 3 s. It is recommended to heat sink the lead wires of the ThermoFuse varistors (NT series). 

## **Wave soldering** 

Recommended temperature profile for wave soldering only for ThermoFuse varistors (NT series). 

**Important note** : Temperatures of all preheat stages and the solder bath must be strictly controlled. 

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**SIOV Metal Oxide Varistors** 

**B72220W/R* NT20 series** 

**ThermoFuse Varistors, NT series** 

## **Cautions and warnings** 

## **General** 

1. EPCOS metal oxide varistors (SIOVs) are designed for specific applications and should not be used for purposes not identified in our specifications, application notes and data books unless otherwise agreed with EPCOS during the design-in-phase. 

2. Ensure suitability of SIOVs through reliability testing during the design-in phase. The SIOVs should be evaluated taking into consideration worst-case conditions. 

3. For applications of SIOVs in line-to ground circuits based on various international and local standards there are restrictions existing or additional safety measures required. 

## **Storage** 

1. Store SIOVs only in original packaging. Do not open the package before storage. 

2. Storage conditions in original packaging: 

Storage temperature: -25 °C … +45 °C Relative humidity: <75% annual average, <95% on maximum 30 days a year. Dew precipitation: Is to be avoided. 

3. Avoid contamination of SIOVs surface during storage, handling and processing. 

4. Avoid storage of SIOVs in harmful environments which can affect the function during long-term operation (examples given under operation precautions). 

5. The SIOV type series should be soldered within the time specified. 

SIOV-S, -Q, -LS 24 month T, ETFV and NT types 12 month. 

## **Handling** 

1. SIOVs must not be dropped. 

2. Components must not be touched with bare hands. Gloves are recommended. 

3. Avoid contamination of the surface of SIOV electrodes during handling, be careful of the sharp edge of SIOV electrodes. 

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**SIOV Metal Oxide Varistors ThermoFuse Varistors, NT series** 

**B72220W/R* NT20 series** 

## **Soldering (where applicable)** 

1. Use rosin-type flux or non-activated flux. 

2. Insufficient preheating may cause ceramic cracks. 

3. Rapid cooling by dipping in solvent is not recommended. 

4. Complete removal of flux is recommended. 

## **Mounting** 

1. Potting, sealing or adhesive compounds can produce chemical reactions in the SIOV ceramic that will degrade the component’s electrical characteristics. 

2. Overloading SIOVs may result in ruptured packages and expulsion of hot materials. For this reason the SIOVs should be physically shielded from adjacent components. 

## **Operation** 

1. Use SIOVs only within the specified temperature operating range 

2. Use SIOVs only within the specified voltage and current ranges. 

3.    Environmental conditions must not harm the SIOVs. Use SIOVs only in normal atmospheric conditions. Avoid use in the presence of deoxidizing gases (chlorine gas, hydrogen sulfide gas, ammonia gas, sulfuric acid gas, etc), corrosive agents, humid or salty conditions, Avoid contact with any liquids and solvents. 

## **Display of ordering codes for TDK Electronics products** 

The ordering code for one and the same product can be represented differently in data sheets, data books, other publications, on the company website, or in order-related documents such as shipping notes, order confirmations and product labels. **The varying representations of the ordering codes are due to different processes employed and do not affect the specifications of the respective products** . Detailed information can be found on the Internet under www.tdk-electronics.tdk.com/orderingcodes. 

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## **Important notes** 

The following applies to all products named in this publication: 

1. Some parts of this publication contain **statements about the suitability of our products for certain areas of application** . These statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. We nevertheless expressly point out **that such statements cannot be regarded as binding statements about the suitability of our products for a particular customer application.** As a rule we are either unfamiliar with individual customer applications or less familiar with them than the customers themselves. For these reasons, it is always ultimately incumbent on the customer to check and decide whether a product with the properties described in the product specification is suitable for use in a particular customer application. 

2. We also point out that **in individual cases, a malfunction of electronic components or failure before the end of their usual service life cannot be completely ruled out in the current state of the art, even if they are operated as specified.** In customer applications requiring a very high level of operational safety and especially in customer applications in which the malfunction or failure of an electronic component could endanger human life or health (e.g. in accident prevention or life-saving systems), it must therefore be ensured by means of suitable design of the customer application or other action taken by the customer (e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by third parties in the event of malfunction or failure of an electronic component. 

3. **The warnings, cautions and product-specific notes must be observed.** 

4. In order to satisfy certain technical requirements, **some of the products described in this publication may contain substances subject to restrictions in certain jurisdictions (e.g. because they are classed as hazardous)** . Useful information on this will be found in our Material Data Sheets on the Internet (www.tdk-electronics.tdk.com/material). Should you have any more detailed questions, please contact our sales offices. 

5. We constantly strive to improve our products. Consequently, **the products described in this publication may change from time to time** . The same is true of the corresponding product specifications. Please check therefore to what extent product descriptions and specifications contained in this publication are still applicable before or when you place an order. 

We also **reserve the right to discontinue production and delivery of products** . Consequently, we cannot guarantee that all products named in this publication will always be available. The aforementioned does not apply in the case of individual agreements deviating from the foregoing for customer-specific products. 

6. Unless otherwise agreed in individual contracts, **all orders are subject to our General Terms and Conditions of Supply.** 

7. **Our manufacturing sites serving the automotive business apply the IATF 16949 standard.** The IATF certifications confirm our compliance with requirements regarding the quality management system in the automotive industry. Referring to customer requirements and customer specific requirements (“CSR”) TDK always has and will continue to have the policy of respecting individual agreements. Even if IATF 16949 may appear to support the acceptance of unilateral requirements, we hereby like to emphasize that **only requirements mutually agreed upon can and will be implemented in our Quality Management System.** For clarification purposes we like to point out that obligations from IATF 16949 shall only become legally binding if individually agreed upon. 

Page 18 of 19 

## **Important notes** 

8. The trade names EPCOS, CeraCharge, CeraDiode, CeraLink, CeraPad, CeraPlas, CSMP, CTVS, DeltaCap, DigiSiMic, ExoCore, FilterCap, FormFit, LeaXield, MiniBlue, MiniCell, MKD, MKK, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, PowerHap, PQSine, PQvar, SIFERRIT, SIFI, SIKOREL, SilverCap, SIMDAD, SiMic, SIMID, SineFormer, SIOV, ThermoFuse, WindCap are **trademarks registered or pending** in Europe and in other countries. Further information will be found on the Internet at www.tdk-electronics.tdk.com/trademarks. 

Release 2018-10 

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