# TVS Diode, STS521xxxUxxx Series, Unidirectional, 3.3 V, 15 V, SOD-523, 2 Pins

![Product image](https://novapart.co/image/farnell:3755197/)

**URL**: https://novapart.co/products/STS521033U112/tvs-diode-sts521xxxuxxx-series-unidirectional-33-v
**SKU**: STS521033U112
**Manufacturer**: EATON BUSSMANN
**Category**: Circuit Protection || TVS - Transient Voltage Suppressors || TVS Diodes
**Price**: €0.0700
**Stock**: 100+
**Lead Time**: 106 days (indicative)

## Specifications

| Parameter | Value |
|---|---|
| Svhc | To Be Advised |
| No. Of Pins | 2Pins |
| Tvs Polarity | Unidirectional |
| Product Range | STS521xxxUxxx Series |
| Qualification | - |
| Diode Mounting | Surface Mount |
| Diode Case Style | SOD-523 |
| Clamping Voltage Max | 15V |
| Reverse Standoff Voltage | 3.3V |
| Maximum Breakdown Voltage | - |
| Minimum Breakdown Voltage | 4V |
| Operating Temperature Max | 125°C |
| Peak Pulse Power Dissipation | 250W |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:3755197/)

Technical Data **11159** 

Effective September 2020 

## STS521XXXUXXX TVS Diode ESD suppressor 

## **Applications** 

- Cellular handsets and accessories 

- Microprocessor based equipment 

- Portable electronics 

- Notebooks, desktops, and servers 

- Portable instrumentation 

- Peripherals 

- Digital cameras 

## **Product features** 

- Compact package size 0.063” x 0.032” 

- (1.6 mm x 0.8 mm) 

- Protects one uni-directional I/O line 

- Low clamping voltage 

- Low leakage current 

- Meets moisture sensitivity level (MSL) 3 

- Molding compound flammability rating: UL 94V-0 

- Termination finish: Tin 

## **Environmental compliance and general specifications** 

- IEC61000-4-2 (ESD) 

   - Up to ±30 kV (air) 

   - Up to ±30 kV (contact) 

- IEC61000-4-5 (Lightning) Up to 15 A (8/20 µs) 

**==> picture [58 x 28] intentionally omitted <==**

**----- Start of picture text -----**<br>
HALOGEN<br>Pb HF<br>FREE<br>SO<br>**----- End of picture text -----**<br>


## **Ordering part number** 

**ST S52 1 033 U 112** Family Package (S52 = SOD-523) — ~~]~~ }]]| Number of channels (1=1) Operating voltage (033 = 3.3 V) Bi/Uni directional (U=Uni) Capacitance (112 = 110 pF) 

## **Pin out/functional diagram** 

STS521XXXUXXX TVS Diode ESD suppressor 

Technical Data 11159 Effective September 2020 

## **Absolute maximum ratings** 

(+25 °C, RH=45%-75%, unless otherwise noted) 

|**Parameter**||**Symbol**||||||**Value**||||||||**Unit**|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
||||STS521033||STS521050|||STS521070||STS521120||STS521240||STS521360|||
||||U112||U751|||U701||U351||U161||U201|||
|Peak pulse power dissipation on 8/20 μs waveform||Ppp|250||150|||120||120||200||120||W|
|ESD per IEC 61000-4-2 (Air)||VESD|+/-20||+/-30|||+/-30||+/-15||+/-30||+/-25||kV|
|ESD per IEC 61000-4-2 (Contact)|||+/-15||+/-30|||+/-30||+/-8||+/-30||+/-25|||
|Lead soldering temperature||TL||||+260 (10 seconds)||||||||||°C|
|Operating junction temperature range||TJ|||||-55 to +125|||||||||°C|
|Storage temperature range||TSTG|||||-55 to +150|||||||||°C|



## **Electrical characteristics** 

(+25 °C) 

|**STS521033U112**||||||||||
|---|---|---|---|---|---|---|---|---|---|
|**Parameter**|**Test condition**|||**Minimum**||**Typical**||**Maximum**|**Symbol (Units)**|
|Reverse working voltage|-|||-||-||3.3|VRWM(V)|
|Reverse breakdown voltage|IT= 1 mA|||4.0||-||-|VBR(V)|
|Reverse leakage current|VRWM= 3.3V|||-||1||5|IR(μA)|
|Clamping voltage|Ipp =15 A,|||-||15||-|VC(V)|
||tp= 8/20 μs|||||||||
|Junction capacitance|VRWM= 0V, f = 1 MHz|||-||110||-|CJ(pF)|



|**STS521050U751**||||||||||
|---|---|---|---|---|---|---|---|---|---|
|**Parameter**|**Test condition**|||**Minimum**||**Typical**||**Maximum**|**Symbol (Units)**|
|Reverse working voltage|-|||-||-||5.0|VRWM(V)|
|Reverse breakdown voltage|IT= 1 mA|||6.0||-||8.0|VBR(V)|
|Reverse leakage current|VRWM= 5.0 V|||-||0.01||0.1|IR(μA)|
|Forward voltage|IF= 15 mA|||-||0.8||1.1|VF(V)|
|Peak pulse current|tp= 8/20 μs|||-||-||10|IPP(A)|
|Clamping voltage|Ipp =1 A,|||-||8.5||10|VC(V)|
||tp= 8/20 μs|||||||||
||Ipp =10 A,|||-||12||15|VC(V)|
||tp= 8/20 μs|||||||||
|Junction capacitance|VRWM= 0V, f = 1 MHz|||-||75||100|CJ(pF)|



2 

www.eaton.com/electronics 

Technical Data 11159 Effective September 2020 

STS521XXXUXXX TVS Diode ESD suppressor 

|TVS Diode ESD supp||essor|||||||Effective|
|---|---|---|---|---|---|---|---|---|---|
|**STS521070U701**||||||||||
|**Parameter**|**Test condition**|||**Minimum**||**Typical**||**Maximum**|**Symbol (Units)**|
|Reverse working voltage|-|||-||-||7.0|VRWM(V)|
|Reverse breakdown voltage|IT= 1 mA|||7.5||8.5||9.5|VBR(V)|
|Reverse leakage current|VRWM= 7 V|||-||-||0.1|IR(μA)|
|Clamping voltage|Ipp =1 A,|||-||-||13|VC(V)|
||tp= 8/20 μs|||||||||
||Ipp =9 A,|||-||-||16|VC(V)|
||tp= 8/20 μs|||||||||
|Junction capacitance|VRWM= 0V, f = 1 MHz|||-||70||85|CJ(pF)|
|**STS521120U351**||||||||||
|**Parameter**|**Test condition**|||**Minimum**||**Typical**||**Maximum**|**Symbol (Units)**|
|Reverse working voltage|-|||-||-||12.0|VRWM(V)|
|Reverse breakdown voltage|IT= 1 mA|||13.3||-||-|VBR(V)|
|Reverse leakage current|VRWM= 12 V|||-||-||1|IR(μA)|
|Clamping voltage|Ipp =1 A,|||-||16||18|VC(V)|
||tp= 8/20 μs|||||||||
||Ipp =6 A,|||-||21||25|VC(V)|
||tp= 8/20 μs|||||||||
|Junction capacitance|VRWM= 0V, f = 1 MHz|||-||35||40|CJ(pF)|
|**STS521240U161**||||||||||
|**Parameter**|**Test condition**|||**Minimum**||**Typical**||**Maximum**|**Symbol (Units)**|
|Reverse working voltage|-|||-||-||24|VRWM(V)|
|Reverse breakdown voltage|IT= 1 mA|||26.7||-||-|VBR(V)|
|Reverse leakage current|VRWM= 24 V|||-||-||0.1|IR(μA)|
|Clamping voltage|Ipp =1 A,|||-||35||40|VC(V)|
||tp= 8/20 μs|||||||||
||Ipp =4 A,|||-||42||48|VC(V)|
||tp= 8/20 μs|||||||||
|Junction capacitance|VRWM= 0V, f = 1 MHz|||-||16||25|CJ(pF)|
|**STS521360U201**||||||||||
|**Parameter**|**Test condition**|||**Minimum**||**Typical**||**Maximum**|**Symbol (Units)**|
|Reverse working voltage|-|||-||-||36|VRWM(V)|
|Reverse breakdown voltage|IT= 1 mA|||40||-||-|VBR(V)|
|Reverse leakage current|VRWM= 36 V|||-||-||5|IR(μA)|
|Clamping voltage|Ipp =1 A,|||-||-||55|VC(V)|
||tp= 8/20 μs|||||||||
|Junction capacitance|VRWM= 0V, f = 1 MHz|||-||-||20|CJ(pF)|



3 

www.eaton.com/electronics 

STS521XXXUXXX TVS Diode ESD suppressor 

Technical Data 11159 Effective September 2020 

## **Mechanical parameters, pad layout- mm/inches** 

||**Millimeters**|**Millimeters**|**Millimeters**|**Millimeters**||**Inches**|**Inches**|**Inches**|**Inches**||
|---|---|---|---|---|---|---|---|---|---|---|
|**Dimension**|**Minimum**|||**Maximum**||**Minimum**||||**Maximum**|
|A|0.50|||0.70||0.020||||0.028|
|B|0.25|||0.35||0.010||||0.014|
|C|0.07|||0.20||0.0028||||0.0079|
|D|1.10|||1.30||0.043||||0.051|
|E|0.70|||0.90||0.028||||0.035|
|F|1.50|||1.70||0.059||||0.067|
|G|0.15|||0.25||0.006||||0.010|
|P1|0.40|0.40||||0.016|0.016||||
|P|1.80|1.80||||0.072|0.072||||



## **Part marking** 

**==> picture [295 x 108] intentionally omitted <==**

**----- Start of picture text -----**<br>
(STS521033U112) (STS521050U751) (STS521070U701)<br>1 2 1 2 1<br>(STS521120U351) (STS521240U161) (STS521360U201)<br>**----- End of picture text -----**<br>


4 

www.eaton.com/electronics 

Technical Data 11159 Effective September 2020 

STS521XXXUXXX TVS Diode ESD suppressor 

## **Packaging information mm/inches** 

Drawing not to scale. 

Supplied in tape and reel packaging, 5,000 parts per 7” diameter reel (EIA-481 compliant) 

5 

www.eaton.com/electronics 

STS521XXXUXXX TVS Diode ESD suppressor 

Technical Data 11159 Effective September 2020 

**Ratings and V-I characteristic curves** (+25 °C unless otherwise noted) 

## **V- I curve characteristics (Uni-directional)** 

**Pulse derating curve** 

## **Pulse waveform (8/20 µs)** 

**ESD waveform** 

6 

www.eaton.com/electronics 

STS521XXXUXXX TVS Diode ESD suppressor 

Technical Data 11159 Effective Juy 2020 

## **Solder reflow profile** 

**==> picture [328 x 182] intentionally omitted <==**

**----- Start of picture text -----**<br>
TP<br>TC -5°C<br>Max. Ramp Up Rate = 3°C/s tP<br>Max. Ramp Down Rate = 6°C/s<br>TL<br>Preheat t |<br>"= A<br>Tsmax<br>Tsmin<br>   ts<br>25°C<br>Time 25°C to Peak  Time<br>Temperature<br>**----- End of picture text -----**<br>


## **Table 1 - Standard SnPb solder (Tc)** 

|**Package**<br>**thickness**||**Volume**<br>**mm3**<br>**<350**||**Volume**<br>**mm3**<br>**≥350**|
|---|---|---|---|---|
|<2.5 mm<br>≥2.5 mm||235 °C<br>220 °C||220 °C<br>220 °C|



## **Table 2 - Lead (Pb) free solder (Tc)** 

|**Package**<br>**thickness**||**Volume**<br>**mm3**<br>**<350**||**Volume**<br>**mm3**<br>**350 - 2000**||**Volume**<br>**mm3**<br>**>2000**|
|---|---|---|---|---|---|---|
|<1.6 mm||260 °C||260 °C||260 °C|
|1.6 – 2.5 mm||260 °C||250 °C||245 °C|
|>2.5 mm||250 °C||245 °C||245 °C|



## **Reference J-STD-020** 

|**Profile feature**||**Standard SnPb solder**||**Lead (Pb) free solder**|
|---|---|---|---|---|
|Preheat and soak     • Temperature min. (Tsmin)||100 °C||150 °C|
|• Temperature max. (Tsmax)||150 °C||200 °C|
|• Time (Tsminto Tsmax) (ts)||60-120 seconds||60-120 seconds|
|Ramp up rate TLto Tp||3 °C/ second max.||3 °C/ second max.|
|Liquidous temperature (Tl)||183 °C||217 °C|
|Time (tL) maintained above TL||60-150 seconds||60-150 seconds|
|Peak package body temperature (TP)*||Table 1||Table 2|
|Time (tp)* within 5 °C of the specified classification temperature (Tc)||20 seconds*||30 seconds*|
|Ramp-down rate (Tpto TL)||6 °C/ second max.||6 °C/ second max.|
|Time 25 °C to peak temperature||6 minutes max.||8 minutes max.|



* Tolerance for peak profile temperature (Tp) is defined as a supplier minimum and a user maximum. 

Life Support Policy: Eaton does not authorize the use of any of its products for use in life support devices or systems without the express written approval of an officer of the Company. Life support systems are devices which support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 

Eaton reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Eaton also reserves the right to change or update, without notice, any technical information contained in this bulletin. 

**Eaton Electronics Division** 1000 Eaton Boulevard Cleveland, OH 44122 United States Eaton.com/electronics © 2020 Eaton All Rights Reserved Printed in USA Publication No. 11159 BU-MC20141 September 2020 

Follow us on social media to get the Eaton is a registered trademark. latest product and support information. All other trademarks are property of their respective owners. f/¥jinjo 



## Links

- [View this product on Novapart](https://novapart.co/products/STS521033U112/tvs-diode-sts521xxxuxxx-series-unidirectional-33-v)
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- [Supplier page](https://es.farnell.com/eaton-bussmann/sts521033u112/tvs-diode-unidir-3-3v-250w-sod/dp/3755197)
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