# Fast / Ultrafast Diode, 1.2 kV, 5 A, Single, 1.25 V, 48 ns, 55 A

![Product image](https://novapart.co/image/farnell:2344055RL/)

**URL**: https://novapart.co/products/STTH512B-TR/fast-ultrafast-diode-12-kv-5-a-single-125-v-48-ns
**SKU**: STTH512B-TR
**Manufacturer**: STMICROELECTRONICS
**Category**: Semiconductors - Discretes || Diodes & Rectifiers || Fast & Ultrafast Recovery Rectifier Diodes
**Price**: €0.2540
**Stock**: 1000+
**Lead Time**: 120 days (indicative)

## Description

Repetitive Reverse Voltage Vrrm Max:1.2kV; Forward Current If(AV):5A; Diode Configuration:Single; Forward Voltage VF Max:1.25V; Reverse Recovery Time trr Max:48ns; Forward Surge Current

## Specifications

| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| No. Of Pins | 3 Pin |
| Product Range | STTH5 |
| Qualification | - |
| Diode Case Style | TO-252 (DPAK) |
| Diode Configuration | Single |
| Forward Voltage Max | 1.25V |
| Forward Surge Current | 55A |
| Reverse Recovery Time | 48ns |
| Average Forward Current | 5A |
| Operating Temperature Max | 175°C |
| Repetitive Peak Reverse Voltage | 1.2kV |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:2344055RL/)

## **STTH512** 

## Ultrafast recovery - 1200 V diode 

**Datasheet** - **production data** 

## **Description** 

The high quality design of this diode has produced a device with low leakage current, regularly reproducible characteristics and intrinsic ruggedness. These characteristics make it ideal for heavy duty applications that demand long term reliability. 

Such demanding applications include industrial power supplies, motor control, and similar mission-critical systems that require rectification and freewheeling. These diodes also fit into auxiliary functions such as snubber, bootstrap, and demagnetization applications. 

The improved performance in low leakage current, and therefore thermal runaway guard band, is an immediate competitive advantage for this device. 

**Table 1. Device summary** 

## **Features** 

- Ultrafast, soft recovery 

- Very low conduction and switching losses 

- High frequency and/or high pulsed current operation 

**Symbol Value** I 5 A F(AV) VRRM 1200 V Tj(max) 175 °C VF (typ) 1.25 V trr (typ) 48 ns ~~a~~ 

- High reverse voltage capability 

- High junction temperature 

- ECOPACK[®] 2 compliant component for DPAK on demand 

- Insulated package: TO-220FPAC 

   - Insulated voltage: 2000 VRMS sine 

November 2014 

DocID12154 Rev 2 

1/13 

This is information on a product in full production. 

_www.st.com_ 

**Characteristics** 

**STTH512** 

## **1 Characteristics** 

**Table 2. Absolute ratings (limiting values at 25 °C, unless otherwise stated)** 

|**Symbol**|**Parameter**|**Parameter**|**Parameter**|**Value**|**Unit**|
|---|---|---|---|---|---|
|VRRM|Repetitive peak reverse voltage|||1200|V|
|IF(RMS)|RMS forward current|TO-220AC / TO-220FPAC||30|A|
|||DPAK||10||
|IF(AV)|Average forward current,δ= 0.5, square<br>wave|TO-220AC / DPAK|Tc= 145° C|5|A|
|||TO-220FPAC|Tc= 105° C|||
|IFRM|Repetitive peak forward current|tp= 5 µs, F = 5 kHz square||60|A|
|IFSM|Surge non repetitive forward current|tp= 10 ms Sinusoidal||55|A|
|Tstg|Storage temperature range|||-65 to + 175|°C|
|Tj|Maximum operating junction temperature|||175|°C|



**Table 3. Thermal resistance** 

|**Symbol**|**Parameter**||**Value**|**Unit**|
|---|---|---|---|---|
|Rth(j-c)|Junction to case|TO-220AC / DPAK|2.5|°C/W|
|||TO-220FPAC|5.8||



**Table 4. Static electrical characteristics** 

|**Symbol**|**Parameter**|**Test conditions**|**Test conditions**|**Min.**|**Typ.**|**Max.**|**Unit**|
|---|---|---|---|---|---|---|---|
|IR<br>(1)|Reverse leakage current|Tj= 25° C|VR= VRRM|||5|µA|
|||Tj= 125° C|||3|30||
|VF<br>(2)|Forward voltage drop|Tj= 25° C|IF= 5 A|||2.2|V|
|||Tj= 125° C|||1.30|2.0||
|||Tj= 150° C|||1.25|1.9||



1. Pulse test: tp = 5 ms, δ < 2% 

2. Pulse test: tp = 380 µs, δ < 2% 

To evaluate the conduction losses use the following equation: P = 1.5 x IF(AV) + 0.08 IF2(RMS) 

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**STTH512** 

**Characteristics** 

**Table 5. Dynamic characteristics** 

||**Table 5.**|**Dynamic characteristics**|||||
|---|---|---|---|---|---|---|
|**Symbol**|**Parameter**|**Test conditions**|**Min.**|**Typ.**|**Max.**|**Unit**|
|trr|Reverse recovery time<br>IF <br>V<br>IF <br>V|= 1 A, dIF/dt = -50 A/µs,<br>R= 30 V, Tj= 25 °C|||95|ns|
|||= 1 A, dIF/dt = -100 A/µs,<br>R= 30 V, Tj= 25 °C||48|70||
|IRM|Reverse recovery current<br>IF <br>V|= 5 A, dIF/dt = -200 A/µs,<br>R= 600 V, Tj= 125 °C||11|16|A|
|S|Softness factor<br>IF <br>V|= 5 A, dIF/dt = -200 A/µs,<br>R= 600 V, Tj= 125 °C||2|||
|tfr|Forward recovery time<br>IF <br>V|= 5 A      dIF/dt = 50 A/µs<br>FR= 1.5 x VFmax, Tj= 25 °C|||400|ns|
|VFP|Forward recovery voltage<br>IF <br>Tj|= 5 A, dIF/dt = 50 A/µs,<br>= 25 °C||9.5||V|



**Figure 1. Conduction losses versus average current** 

**Figure 2. Forward voltage drop versus forward current** 

**==> picture [463 x 340] intentionally omitted <==**

**----- Start of picture text -----**<br>
P(W) IFM(A)<br>13 50<br>12 δ = 0.1 δ = 0.2 δ = 0.5 δ = 1<br>45<br>11 δ = 0.05 T =150°C j<br>10 40 (typical values)<br>9 35<br>8 30<br>7 25 T =25j ° C<br>6 (maximum values)<br>5 20 T =150°Cj<br>4 15 (maximum values)<br>3 T<br>10<br>2<br>1 IF(AV)(A) δ =tp/T tp 5 V FM (V)<br>0 0<br>0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0<br>Figure 3. Relative variation of thermal  Figure 4. Relative variation of thermal<br>impedance junction to case versus pulse  impedance junction to case versus pulse<br>duration duration<br>Zth(j-c)/Rth(j-c) Zth(j-c)/Rth(j-c)<br>1.0 1.0<br>Single pulse Single pulse<br>0.9 TO-220AC 0.9 TO-220FPAC<br>DPAK<br>0.8 0.8<br>0.7 0.7<br>0.6 0.6<br>0.5 0.5<br>0.4 0.4<br>0.3 0.3<br>0.2 0.2<br>0.1 tp(s) 0.1 tp(s)<br>0.0 0.0<br>1.E-03 1.E-02 1.E-01 1.E+00 1.E-03 1.E-02 1.E-01 1.E+00 1.E+01<br>**----- End of picture text -----**<br>


DocID12154 Rev 2 

3/13 

**Characteristics** 

**STTH512** 

**Figure 5. Peak reverse recovery current versus dI** F **/dt (typical values)** 

**==> picture [205 x 138] intentionally omitted <==**

**----- Start of picture text -----**<br>
IRM(A)<br>28<br>26 VR=600V<br>24 T =125°C j<br>22 I F =2 x I F(AV)<br>20<br>18 I F =I F(AV)<br>16 I F =0.5 x I F(AV)<br>14<br>12<br>10<br>8<br>6<br>4<br>2 dIF/dt(A/µs)<br>0<br>0 100 200 300 400 500<br>**----- End of picture text -----**<br>


**Figure 6. Reverse recovery time versus dI** F **/dt (typical values)** 

**==> picture [204 x 141] intentionally omitted <==**

**----- Start of picture text -----**<br>
trr(ns)<br>600<br>550 VT =125°CjR=600V<br>500<br>450<br>400<br>350 I F =2 x I F(AV)<br>300 IF=IF(AV) IF=0.5 x IF(AV)<br>250<br>200<br>150<br>100<br>50 dI F /dt(A/µs)<br>0<br>0 100 200 300 400 500<br>**----- End of picture text -----**<br>


**Figure 7. Reverse recovery charges versus dI** F **/dt (typical values)** 

**Figure 8. Softness factor versus dI** F **/dt (typical values)** 

**==> picture [463 x 147] intentionally omitted <==**

**----- Start of picture text -----**<br>
Qrr(nC) S factor<br>2000 4.0<br>1800 V T =125 jR=600V °C 3.5 I T =125 VF j R ≤ =600V2xI°F(AV) C<br>1600 I F =2 x I F(AV)<br>1400 3.0<br>1200<br>IF=IF(AV) 2.5<br>1000 IF=0.5 x IF(AV)<br>2.0<br>800<br>600 1.5<br>400<br>1.0<br>200 dI F /dt(A/µs) dI F /dt(A/µs)<br>0 0.5<br>0 100 200 300 400 500 0 100 200 300 400 500<br>**----- End of picture text -----**<br>


**Figure 9. Relative variations of dynamic parameters versus junction temperature** 

**Figure 10. Transient peak forward voltage versus dI** F **/dt (typical values)** 

**==> picture [463 x 146] intentionally omitted <==**

**----- Start of picture text -----**<br>
VFP(V)<br>2.252.00 Reference: T =125°CV IF R =I =600 F(AV) j V 5045 IT =125°C F j=I F(AV)<br>1.75 S factor 40<br>1.50 35<br>1.25 30<br>1.00 25<br>0.75 trr 20<br>IRM<br>15<br>0.50<br>0.25 QRR T (°C)j 105<br>0.00 dIF/dt(A/µs)<br>25 50 75 100 125 0<br>0 50 100 150 200 250 300<br>**----- End of picture text -----**<br>


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**STTH512** 

**Characteristics** 

**Figure 11. Forward recovery time versus Figure 12. Junction capacitance versus reverse dI** F **/dt (typical values) voltage applied (typical values)** 

**==> picture [435 x 138] intentionally omitted <==**

**----- Start of picture text -----**<br>
tfr(ns) C(pF)<br>700 100<br>IF=IF(AV) F=1MHz<br>V FR =1.5 x V T =125°Cj F max. VOSCT =25=30mVj ° C RMS<br>600 PCAC Eee SSS<br>PCELELEEEC Ee SS<br>500<br>ACELCELEEECCL ELLE 10 TTT SELL LIT<br>400 | [ot<br>FEE HPTSS<br>300 HEP eee SEE<br>FECHA HA |<br>dIF/dt(A/µs) VR(V)<br>200 HH EEE 1 a ee li<br>0 50 100 150 200 250 300 350 400 450 500 1 10 100 1000<br>**----- End of picture text -----**<br>


## **Figure 13. Thermal resistance junction to ambient versus copper surface under tab** 

DocID12154 Rev 2 

5/13 

**STTH512** 

**Package information** 

## **2 Package information** 

- Epoxy meets UL94, V0 

- Cooling method: by conduction (C) 

- Recommended torque values: 0.55 N·m for TO-220AC and TO-220FPAC 

- Maximum torque value: 0.7 N·m for TO-220AC and TO-220FPAC 

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK[®] packages, depending on their level of environmental compliance. ECOPACK[®] specifications, grade definitions and product status are available at: _www.st.com_ . ECOPACK[®] is an ST trademark. 

## **Figure 14. TO-220AC dimension definitions** 

**==> picture [314 x 315] intentionally omitted <==**

**----- Start of picture text -----**<br>
H2 A<br>Ø I C<br>L5<br>L7<br>L6<br>L2<br>D<br>F1 L9<br>L4<br>F<br>M<br>E<br>G<br>**----- End of picture text -----**<br>


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**Package information** 

**Table 6. TO-220AC dimension values** 

||**Table 6. TO-220AC dimension values**|**Table 6. TO-220AC dimension values**|**Table 6. TO-220AC dimension values**|**Table 6. TO-220AC dimension values**|**Table 6. TO-220AC dimension values**|**Table 6. TO-220AC dimension values**|
|---|---|---|---|---|---|---|
|**Ref.**|**Dimensions**||||||
||**Millimeters**|||**Inches**|||
||**Min.**|**Typ.**|**Max.**|**Min.**|**Typ.**|**Max.**|
|A|4.40||4.60|0.173||0.181|
|C|1.23||1.32|0.048||0.051|
|D|2.40||2.72|0.094||0.107|
|E|0.49||0.70|0.019||0.027|
|F|0.61||0.88|0.024||0.034|
|F1|1.14||1.70|0.044||0.066|
|G|4.95||5.15|0.194||0.202|
|H2|10.00||10.40|0.393||0.409|
|L2||16.40 typ.|||0.645 typ.||
|L4|13.00||14.00|0.511||0.551|
|L5|2.65||2.95|0.104||0.116|
|L6|15.25||15.75|0.600||0.620|
|L7|6.20||6.60|0.244||0.259|
|L9|3.50||3.93|0.137||0.154|
|M||2.6 typ.|||0.102 typ.||
|Diam. I|3.75||3.85|0.147||0.151|



DocID12154 Rev 2 

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**STTH512** 

**Package information** 

## **Figure 15. TO-220FPAC dimension definitions** 

**==> picture [368 x 435] intentionally omitted <==**

**----- Start of picture text -----**<br>
A<br>H B<br>Dia<br>L6<br>L2 L7<br>L3<br>D<br>F1<br>L4<br>F<br>E<br>G1<br>G<br>**----- End of picture text -----**<br>


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**Package information** 

**Table 7. TO-220FPAC dimension values** 

||**Table 7. TO-220FPAC dimension values**|**Table 7. TO-220FPAC dimension values**|**Table 7. TO-220FPAC dimension values**|**Table 7. TO-220FPAC dimension values**|**Table 7. TO-220FPAC dimension values**|**Table 7. TO-220FPAC dimension values**|
|---|---|---|---|---|---|---|
|**Ref.**|**Dimensions**||||||
||**Millimeters**|||**Inches**|||
||**Min.**|**Typ.**|**Max.**|**Min.**|**Typ.**|**Max.**|
|A|4.4||4.6|0.173||0.181|
|B|2.5||2.7|0.098||0.106|
|D|2.5||2.75|0.098||0.108|
|E|0.45||0.70|0.018||0.027|
|F|0.75||1|0.030||0.039|
|F1|1.15||1.70|0.045||0.067|
|G|4.95||5.20|0.195||0.205|
|G1|2.4||2.7|0.094||0.106|
|H|10||10.4|0.393||0.409|
|L2||16 Typ.|||0.63 Typ.||
|L3|28.6||30.6|1.126||1.205|
|L4|9.8||10.6|0.386||0.417|
|L6|15.9||16.4|0.626||0.646|
|L7|9.00||9.30|0.354||0.366|
|Dia.|3.00||3.20|0.118||0.126|



DocID12154 Rev 2 

9/13 

**STTH512** 

**Package information** 

## **Figure 16. DPAK dimension definitions** 

**==> picture [350 x 360] intentionally omitted <==**

**----- Start of picture text -----**<br>
E<br>A<br>b4<br>c2 E1<br>L2<br>Thermal pad<br>D1<br>D D<br>H R<br>L4<br>A1<br>e b R<br>e1 c<br>A2<br>L1<br>L<br>V2<br>G auge<br>0.25 plane<br>**----- End of picture text -----**<br>


_Note: This package drawing may slightly differ from the physical package. However, all the specified dimensions are guaranteed._ 

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**STTH512** 

**Package information** 

**Table 8. DPAK dimension values** 

||**Table 8. DPAK dimension values**|**Table 8. DPAK dimension values**|**Table 8. DPAK dimension values**|**Table 8. DPAK dimension values**|**Table 8. DPAK dimension values**|**Table 8. DPAK dimension values**|
|---|---|---|---|---|---|---|
|**Ref.**<br>~~a~~|**Dimensions**<br>~~a~~||||||
||**Millimeters**<br>~~a~~<br>~~ee~~<br>~~eeeeee~~|||**Inches**<br>~~a~~<br>~~ee~~<br>~~ee~~|||
||**Min.**<br>~~ee~~<br>~~ee~~|**Typ.**<br>~~ee~~<br>~~ee~~|**Max.**<br>~~ee~~<br>~~ee~~|**Min.**<br>~~ee~~<br>~~ee~~|**Typ.**<br>~~ee~~<br>~~ee~~|**Max.**<br>~~ee~~<br>~~ee~~|
|A<br>~~a~~<br>~~a~~|2.18<br>~~ee~~<br>~~es~~|~~ee~~<br>~~es~~|2.40<br>~~ee~~<br>~~ee~~|0.085<br>~~ee~~|~~ee~~|0.094<br>~~ee~~|
|A1<br>~~a~~<br>~~a~~<br>~~a~~|0.90<br>~~ee ~~<br>~~es~~<br>|~~ee~~<br>~~es~~<br>|1.1<br>~~ee~~<br>~~ee~~<br>|0.035<br>~~ee~~<br>|~~ee~~<br>|0.043<br>~~ee~~<br>~~ee~~<br>|
|A2<br>~~a ee~~<br>~~a~~<br>~~a~~|0.03<br>~~ee~~<br><br>|~~ee~~<br><br>|0.23<br>~~ee~~<br><br>|0.001<br>~~ee~~<br><br>|~~ee~~<br><br>|0.01<br>~~ee~~<br>~~ee~~<br><br>~~ee~~<br>|
|b<br>~~a ee~~<br>~~a~~<br>~~a~~|0.64<br>~~ee~~<br><br>|~~ee~~<br><br>|0.90<br>~~ee~~<br><br>|0.025<br>~~ee~~<br><br>|~~ee~~<br><br>|0.035<br>~~ee~~<br>~~ee~~<br>~~ee~~<br><br>~~ee~~<br>|
|b4<br>~~a ee~~<br>~~a~~<br>~~a~~|4.95<br>~~ee~~<br><br>|~~ee~~<br><br>|5.46<br>~~ee~~<br><br>|0.195<br>~~ee~~<br><br>|~~ee~~<br><br>|0.215<br>~~ee~~<br>~~ee~~<br>~~ee~~<br><br>~~ee~~<br>|
|c<br>~~a ee~~<br>~~a~~<br>~~a~~|0.46<br>~~ee~~<br>|~~ee~~<br>|0.61<br>~~ee~~<br>|0.018<br>~~ee~~<br>|~~ee~~<br>|0.024<br>~~ee~~<br>~~ee~~<br>~~ee~~<br><br>~~ee~~|
|c2<br>~~a ee~~<br>~~a~~|0.46<br>~~ee~~|~~ee~~|0.60<br>~~ee~~|0.018<br>~~ee~~|~~ee~~|0.024<br>~~ee~~<br>~~ee~~<br>~~ee~~|
|D<br>~~a~~<br>~~es~~|5.97<br>~~ee~~|~~ee~~|6.22<br>~~ee~~|0.235<br>~~ee~~|~~ee~~|0.245<br>~~ee~~<br>~~ee~~|
|D1<br>~~es~~<br>~~a~~|5.10<br>~~ee~~<br>|~~ee~~<br>|~~ee~~<br>|0.201<br>~~ee~~<br>|~~ee~~<br>|~~ee~~<br>~~ee~~<br>|
|E<br>~~es~~<br>~~a ee~~<br>~~a~~|6.35<br>~~ee~~<br>~~ee~~<br>|~~ee~~<br>~~ee~~<br>|6.73<br>~~ee~~<br>~~ee~~<br>|0.250<br>~~ee~~<br>~~ee~~<br>|~~ee~~<br>~~ee~~<br>|0.265<br>~~ee~~<br>~~ee~~<br>~~ee~~<br>|
|E1<br>~~a~~<br>~~es~~|4.32<br>~~**ee**~~|~~**ee**~~|~~**ee**~~|0.170<br>~~**ee**~~|~~**ee**~~|~~ee~~<br>~~**ee**~~|
|e1<br><br>~~es~~<br>~~a~~|4.4<br>~~**ee**~~|~~**ee**~~|4.7<br>~~**ee**~~|0.173<br>~~**ee**~~|~~**ee**~~|0.185<br>~~**ee**~~<br>~~ee~~|
|H<br><br>~~es~~<br>~~a ee~~<br>~~a~~|9.35<br>~~**ee**~~<br>~~ee~~|~~**ee**~~<br>~~ee~~|10.40<br>~~**ee**~~<br>~~ee~~|0.368<br>~~**ee**~~<br>~~ee~~|~~**ee**~~<br>~~ee~~|0.407<br>~~**ee**~~<br>~~ee~~<br>~~ee~~|
|L<br>~~a~~<br>~~es~~|1.0<br>~~ee~~|~~ee~~|1.78<br>~~ee~~|0.039<br>~~ee~~|~~ee~~|0.070<br>~~ee~~<br>~~ee~~|
|L2<br>~~es~~<br>~~a~~|~~ee~~<br>|~~ee~~|1.27<br>~~ee~~|~~ee~~|~~ee~~|0.05<br>~~ee~~<br>~~ee~~|
|L4<br>~~es~~<br>~~a ee~~<br>~~a~~|0.6<br>~~ee~~<br>~~ee~~<br>|~~ee~~<br>~~ee~~|1.02<br>~~ee~~<br>~~ee~~|0.024<br>~~ee~~<br>~~ee~~|~~ee~~<br>~~ee~~|0.040<br>~~ee~~<br>~~ee~~<br>~~ee~~|
|V2<br>~~a ~~|0°<br> ~~i~~||8°|0°||8°<br>~~ee~~|



DocID12154 Rev 2 

11/13 

**Ordering information** 

**STTH512** 

## **3 Ordering information** 

**Table 9. Ordering information** 

|**Order code**|**Marking**|**Package**|**Weight**|**Base qty**|**Delivery mode**|
|---|---|---|---|---|---|
|STTH512D|STTH512D|TO-220AC|1.86 g|50|Tube|
|STTH512FP|STTH512FP|TO-220FPAC|1.9 g|50|Tube|
|STTH512B-TR|STTH512B|DPAK|0.32 g|2500|Tape and reel|



## **4 Revision history** 

**Table 10. Document revision history** 

|**Date**|**Revision**|**Changes**|
|---|---|---|
|02-Mar-2006|1|First issue.|
|26-Nov-2014|2|Updated DPAK package information and reformatted to current<br>standard.|



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**STTH512** 

## **IMPORTANT NOTICE – PLEASE READ CAREFULLY** 

STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. 

Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. 

No license, express or implied, to any intellectual property right is granted by ST herein. 

Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. 

ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. 

Information in this document supersedes and replaces information previously supplied in any prior versions of this document. 

© 2014 STMicroelectronics – All rights reserved 

DocID12154 Rev 2 

13/13 



## Links

- [View this product on Novapart](https://novapart.co/products/STTH512B-TR/fast-ultrafast-diode-12-kv-5-a-single-125-v-48-ns)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/stmicroelectronics/stth512b-tr/diode-ultrafast-5a-1200v-dpak/dp/2344055RL)
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