STPS40SM120CR

Small Signal Schottky Diode, Dual Common Cathode, 120 V, 40 A, 830 mV, 210 A, 150 °C

⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.

Manufacturer: STMICROELECTRONICS
Product type:
Diode Configuration:Dual Common Cathode; Repetitive Reverse Voltage Vrrm Max:120V; Forward Current If(AV):40A; Forward Voltage VF Max:830mV; Forw; Available until stocks are exhausted
SVHC: No SVHC (17-Dec-2015)
No. of Pins: 3Pins
Product Range: STPS4
Qualification: -
Diode Mounting: Through Hole
Diode Case Style: TO-262
Diode Configuration: Dual Common Cathode
Forward Voltage Max: 830mV
Forward Surge Current: 210A
Reverse Recovery Time: -
Average Forward Current: 40A
Operating Temperature Max: 150°C
Repetitive Peak Reverse Voltage: 120V

Delivery and price
Units per pack	500
Price	1.35 €
Current stock	500+
Lead time	30 days

Datasheet

**==> picture [463 x 293] intentionally omitted <==**

**----- Start of picture text -----**<br>
STPS40SM120C<br>7 re<br>Power Schottky rectifier<br>Datasheet - production data<br>A1 Description<br>K<br>A2 This Schottky rectifier is suited for high frequency<br>switch mode power supply.<br>The voltage drop versus leakage current trade-off<br>is in keeping with medium power hi-density<br>YS K A2 adapter design.<br>A1<br>TO-220AB Packaged in TO-220AB narrow leads, TO-220AB<br>and I²PAK, this device is intended to be used in<br>notebook, game station and desktop adaptors,<br>K [A2]<br>I²PAK TO-220AB A1 providing in these applications a good efficiency<br>N K [A2] narrow leads<br>A1 at both low and high load.<br>**----- End of picture text -----**<br>


The voltage drop versus leakage current trade-off is in keeping with medium power hi-density adapter design. 

Packaged in TO-220AB narrow leads, TO-220AB and I²PAK, this device is intended to be used in notebook, game station and desktop adaptors, providing in these applications a good efficiency at both low and high load. 

**Table 1: Device summary** 

## **Features** 

- High current capability 

- Avalanche rated 

- Low forward voltage drop current 

- High frequency operation 

- ECOPACK[®] 2 compliant component on TO-220AB 

|**Symbol**|**Value**|
|---|---|
|IF(AV)|2 x 20 A|
|VRRM|120 V|
|Tj(max.)|150 °C|
|VF(typ.)|0.46 V|



**Figure 1: Electrical characteristics** 

- [V][ARM][ and I][ARM][ must respect the reverse safe ] operating area defined in Figure 9. VAR and IAR are pulse measurements (tp < 1 μs). VR, IR, VRRM and VF, are static characteristics. 

_www.st.com_ 

April 2017 This is information on a product in full production. 

DocID022917 Rev 3 

1/12 

**Characteristics** 

**STPS40SM120C** 

## **1 Characteristics** 

**Table 2: Absolute ratings (per diode, limiting values at 25 °C, unless otherwise specified)** 

|**Symbol**|**Parameter**|**Parameter**|**Value**|**Unit**|
|---|---|---|---|---|
|VRRM|Repetitivepeak reverse voltage||120|V|
|IF(RMS)|Forward rms current||30|A|
|IF(AV)|Average forward current<br>δ = 0.5, square wave|Per diode, TC= 125 °C|20|A|
|||Per device, TC= 115 °C|40||
|IFSM|Surge non repetitive forward<br>current|tp= 10 ms sine-wave|210|A|
|PARM_(1)_|Repetitive peak avalanche<br>power|tp= 10 µs, Tj= 125 °C|1150|W|
|VARM_(2)_|Maximum repetitive peak<br>avalanche voltage|tp< 10 μs, Tj< 125 °C, IAR< 7.7 A|150|V|
|VASM|Maximum single pulse peak<br>avalanche voltage||||
|Tstg|Storage temperature range||-65 to +175|°C|
|Tj|Maximum operating junction temperature_(3)_||150|°C|



## **Notes:** 

(1)For pulse time duration deratings, please refer to figure 4. More details regarding the avalanche energy measurements and diode validation in the avalanche are provided in the application notes AN1768 and AN2025. (2)See Figure 9 

(3)(dPtot/dTj) < (1/Rth(j-a)) condition to avoid thermal runaway for a diode on its own heatsink. 

**Table 3: Thermal parameters** 

|**Symbol**|**Parameter**||**Max. value**|**Unit**|
|---|---|---|---|---|
|Rth(j-c)|Junction to case|Per diode|1.35|°C/W|
|||Total|0.93||
|Rth(c)|Coupling||0.50||



When the two diodes 1 and 2 are used simultaneously: 

ΔTj(diode 1) = P(diode 1) x Rth(j-c)(Per diode) + P(diode 2) x Rth(c) 

2/12 

DocID022917 Rev 3 

**STPS40SM120C** 

**Characteristics** 

**Table 4: Static electrical characteristics (values per diode)** 

|**Symbol**|**Parameter**|**Test conditions**|**Test conditions**|**Min.**|**Typ.**|**Max.**|**Unit**|
|---|---|---|---|---|---|---|---|
|IR_(1)_|Reverse leakage current|Tj= 25 °C|VR= VRRM|-|55|275|µA|
|||Tj= 125 °C||-|20|50|mA|
|VF_(2)_|Forward voltage drop|Tj= 125 °C|IF= 5 A|-|0.46|0.51|V|
|||Tj= 125 °C|IF= 10 A|-|0.55|0.60||
|||Tj= 25 °C|IF= 20 A|-||0.83||
|||Tj= 125 °C||-|0.63|0.69||



## **Notes:** 

(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 = 0.52 x IF(AV) + 0.0085 x IF[2] (RMS) 

DocID022917 Rev 3 

3/12 

**Characteristics** 

**STPS40SM120C** 

## **1.1 Characteristics (curves)** 

**==> picture [450 x 177] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure 2: Average forward power dissipation  Figure 3: Average forward current versus ambient<br>versus average forward current (per diode)  temperature (δ = 0.5, per diode)<br>20 PF(AV)(W) 24 IF(AV)(A)<br>δ = 0.5<br>Rth(j-a) = Rth(j-c)<br>16 δ = 1 20<br>δ = 0.2<br>δ = 0.1 16<br>12<br>δ = 0.05<br>12<br>8<br>8<br>4 T<br>4<br>0 δ = tp / T tp IF(AV)(A) 0 Tam b(°C)<br>0 4 8 12 16 20 24 28 0 25 50 75 100 125 150<br>**----- End of picture text -----**<br>


**==> picture [462 x 372] intentionally omitted <==**

**----- Start of picture text -----**<br>
Figure 4: Normalized avalanche power derating  Figure 5: Relative variation of thermal impedance<br>versus pulse duration (per diode)  junction to case versus pulse duration (per diode)<br>PARM(tp)<br>1 PARM(10 µs) 1.0 Zth(j-c)/Rth(j-c)<br>0.9<br>0.8<br>0.7<br>0.1<br>0.6<br>0.5<br>0.4<br>0.01 0.3 Single pulse<br>0.2<br>t p(µs) 0.10.0 tp(s)<br>0.001<br>1.E-04 1.E-03 1.E-02 1.E-01 1.E+00<br>1 10 100 1000<br>Figure 6: Reverse leakage current versus reverse  Figure 7: Junction capacitance versus reverse<br>voltage applied (typical values, per diode)  voltage applied (typical values, per diode)<br>IR(mA) C(pF)<br>1.E+02 10000<br>F=1MHz<br>Tj=150°C VoscT=30mVj=25°CRMS<br>1.E+01<br>Tj=125°C<br>1.E+00 Tj=100°C<br>Tj=75°C 1000<br>1.E-01 Tj=50°C<br>1.E-02 Tj=25°C<br>1.E-03 VR(V) 100 VR(V)<br>0 10 20 30 40 50 60 70 80 90 100 110 120 1 10 100 1000<br>**----- End of picture text -----**<br>


4/12 

DocID022917 Rev 3 

**STPS40SM120C** 

**Characteristics** 

**Figure 8: Forward voltage drop versus forward current (per diode)** 

**==> picture [165 x 74] intentionally omitted <==**

**Figure 9: Reverse safe operating area (tp < 1 µs and Tj < 150 °C, per diode)** 

**==> picture [205 x 116] intentionally omitted <==**

**----- Start of picture text -----**<br>
10.0 Iarm (A)<br>9.5<br>9.0<br>8.5<br>8.0<br>7.5<br>7.0<br>6.5 Varm(V)<br>120 130 140 150 160 170<br>**----- End of picture text -----**<br>


DocID022917 Rev 3 

5/12 

**STPS40SM120C** 

**Package** information 

## **2 Package information** 

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. 

- Cooling method: by conduction (C) 

- Epoxy meets UL 94,V0 

- Recommended torque value: 0.55 N·m (for TO-220AB) 

- Maximum torque value: 0.7 N·m (for TO-220AB) 

## **2.1** 

## **TO-220AB narrow leads package information** 

**Figure 10: TO-220AB narrow leads package outline** 

**==> picture [407 x 288] intentionally omitted <==**

6/12 

DocID022917 Rev 3 

**STPS40SM120C Package** information 

**Table 5: TO-220AB narrow leads package mechanical data** 

|**Ref.**|**Dimensions**|**Dimensions**|**Dimensions**|**Dimensions**|
|---|---|---|---|---|
||**Millimeters**||**Inches**||
||**Min.**|**Max.**|**Min.**|**Max.**|
|A|4.40|4.60|0.17|0.18|
|b|0.61|0.88|0.024|0.034|
|b1|0.95|1.20|0.037|0.047|
|c|0.48|0.70|0.019|0.027|
|D|15.25|15.75|0.060|0.062|
|D1|1.27 typ.||0.05 typ.||
|E|10.00|10.40|0.39|0.41|
|e|2.40|2.70|0.094|0.106|
|e1|4.95|5.15|0.19|0.20|
|F|1.23|1.32|0.048|0.052|
|H1|6.20|6.60|0.24|0.26|
|J1|2.40|2.72|0.095|0.107|
|L|13.00|14.00|0.51|0.55|
|L1|2.60|2.90|0.102|0.114|
|L20|15.40 typ.||0.61||
|L30|28.90 typ.||1.14||
|ØP|3.75|3.85|0.147|0.151|
|Q|2.65|2.95|0.104|0.116|



DocID022917 Rev 3 

7/12 

**STPS40SM120C** 

**Package** information 

## **2.2 TO-220AB package information** 

**Figure 11: TO-220AB package outline** 

**==> picture [406 x 544] intentionally omitted <==**

8/12 

DocID022917 Rev 3 

**STPS40SM120C** 

**Package** information 

**Table 6: TO-220AB package mechanical data** 

|**Ref.**|**Dimensions**|**Dimensions**|**Dimensions**|**Dimensions**|
|---|---|---|---|---|
||**Millimeters**||**Inches****_(1)_**||
||**Min.**|**Max.**|**Min.**|**Max.**|
|A|4.40|4.60|0.1732|0.1811|
|b|0.61|0.88|0.0240|0.0346|
|b1|1.14|1.70|0.0449|0.0669|
|c|0.48|0.70|0.0189|0.0276|
|D|15.25|15.75|0.6004|0.6201|
|D1|1.27 typ.||0.0500 typ.||
|E|10.00|10.40|0.3937|0.4094|
|e|2.40|2.70|0.0945|0.1063|
|e1|4.95|5.15|0.1949|0.2028|
|F|1.23|1.32|0.0484|0.0520|
|H1|6.20|6.60|0.2441|0.2598|
|J1|2.40|2.72|0.0945|0.1071|
|L|13.00|14.00|0.5118|0.5512|
|L1|3.50|3.93|0.1378|0.1547|
|L20|16.40 typ.||0.6457 typ.||
|L30|28.90 typ.||1.1378 typ.||
|ØP|3.75|3.85|0.1476|0.1516|
|Q|2.65|2.95|0.1043|0.1161|



**Notes:** 

(1)Inch dimensions are for reference only. 

DocID022917 Rev 3 

9/12 

**STPS40SM120C** 

**Package** information 

## **2.3 I²PAK package information** 

**Figure 12: I²PAK package outline** 

|**Ref.**<br>~~PO~~<br>~~——~~<br>~~ee~~|**Dimensions**<br>~~Cees~~<br>~~PO~~<br>~~——~~|**Dimensions**<br>~~Cees~~<br>~~PO~~<br>~~——~~|**Dimensions**<br>~~Cees~~<br>~~PO~~<br>~~——~~|**Dimensions**<br>~~Cees~~<br>~~PO~~<br>~~——~~|
|---|---|---|---|---|
||**Millimeters**<br>~~Cees~~<br>~~PO—(—“<‘i'~~<br>~~——~~||**Inches**<br>~~Cees~~<br>~~—(—“<‘i'~~<br>~~——~~||
||**Min.**<br>~~PO—(—“<‘i'~~<br>~~——~~<br>~~rs ee~~|**Max.**<br>~~—(—“<‘i'~~<br>~~——~~<br>~~ee~~|**Min.**<br>~~—(—“<‘i'~~<br>~~——~~|**Max.**<br>~~—(—“<‘i'~~|
|A<br>~~——~~<br>~~ee~~<br>~~es~~|4.40<br>~~——~~<br>~~rs ee~~<br>~~ee~~|4.60<br>~~——~~<br>~~ee~~|0.173<br>~~——~~|0.181|
|A1<br>~~ee~~<br>~~es~~|2.40<br>~~rs ee~~<br>~~ee~~|2.72<br>~~ee~~|0.094|0.107|
|b<br>~~es ~~<br>~~a~~<br>~~es~~|0.61<br> ~~ee~~<br>~~ee~~|0.88|0.024|0.035|
|b1<br>~~a~~<br>~~es~~|1.14<br>~~ee~~|1.70|0.044|0.067|
|c<br>~~es ~~<br>~~a~~<br>~~es~~|0.49<br> ~~ee~~<br>~~ee~~|0.70|0.019|0.028|
|c2<br>~~a~~<br>~~es~~<br>~~a~~|1.23<br>~~ee~~<br>~~rs en~~|1.32<br>~~en~~|0.048|0.052|
|D<br>~~es ~~<br>~~a~~<br>~~a~~|8.95<br> ~~ee~~<br>~~rs en~~<br>~~rs Ge~~|9.35<br>~~en~~<br>~~Ge~~|0.352|0.368|
|e<br>~~a~~<br>~~a~~<br>~~es~~|2.40<br>~~rs en~~<br>~~rs Ge~~<br>~~se~~|2.70<br>~~en~~<br>~~Ge~~<br>~~se~~|0.094|0.106|
|e1<br>~~a~~<br>~~es~~|4.95<br>~~rs Ge~~<br>~~se~~|5.15<br>~~Ge~~<br>~~se~~|0.195|0.203|
|E<br>~~es~~<br>~~a~~<br>~~es es~~|10.00<br>~~se~~<br>~~es~~|10.40<br>~~se~~|0.394|0.409|
|L<br>~~es es~~|13.00<br>~~es~~|14.00|0.512|0.551|
|L1<br>~~es es~~<br>~~a~~|3.50<br>~~es~~<br>~~rs~~|3.93<br>~~es~~|0.138<br>~~es~~|0.155<br>~~es~~|
|L2<br>~~a~~|1.27<br>~~rs~~|1.40<br>~~es~~|0.050<br>~~es~~|0.055<br>~~es~~|



~~eS~~ 10/12 DocID022917 Rev 3 

**STPS40SM120C** 

**Ordering** information 

## **3 Ordering information** 

**Table 8: Ordering information** 

|**Order code**|**Marking**|**Package**|**Weight**|**Base**<br>**qty.**|**Delivery**<br>**mode**|
|---|---|---|---|---|---|
|STPS40SM120CR|PS40SM120CR|I²PAK|1.49g|50|Tube|
|STPS40SM120CTN|PS40SM120CTN|TO-220AB<br>narrow leads|1.9 g|50|Tube|
|STPS40SM120CT|PS40SM120CT|TO-220AB|2.2g|50|Tube|



## **4** 

## **Revision history** 

**Table 9: Document revision history** 

|**Date**|**Revision**|**Changes**|
|---|---|---|
|02-Apr-2012|1|First issue.|
|04-Nov-2014|2|Added TO-220AB and TO-220FPABpackage information.|
|11-Apr-2017|3|Updated_Section 1: "Characteristics"_and_Section 1.1:_<br>_"Characteristics (curves)"_.|



DocID022917 Rev 3 

11/12 

**STPS40SM120C** 

## **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. 

- © 2017 STMicroelectronics – All rights reserved 

12/12 

DocID022917 Rev 3

Updated at April 29, 2026

STMicroelectronics is a global leader in the semiconductor industry, recognized for developing highly integrated, energy-efficient solutions that power modern electronics. With a strong focus on innovation, ST provides a comprehensive portfolio of microelectronics that address the demanding requirements of industrial, automotive, communications, and consumer applications. Our extensive selection of STMicroelectronics components is built around a robust lineup of discrete semiconductors and circuit protection devices. We offer a wide variety of single MOSFETs, Schottky diodes, and fast and ultrafast recovery rectifier diodes, designed to deliver exceptional efficiency and thermal performance in power management and conversion systems. For robust circuit protection, our inventory features hundreds of transient voltage suppressors and TVS diodes that safeguard sensitive electronic components against destructive voltage spikes. In addition to core power discretes like TRIACs, SCRs, bipolar transistors, and single IGBTs, our STMicroelectronics range includes specialized integrated passive filters and MEMS sensors. Furthermore, ST offers advanced integrated passive devices, such as baluns and RF filters, which utilize high-quality monolithic RF IPD processes on glass or high-resistance silicon substrates. These components provide competitive cost structures, reduced power losses, and simplified RFIC-to-antenna matching, ensuring optimal system performance and delivering the reliability required for next-generation wireless and power designs.

About Novapart

Novapart is a B2B electronic component broker specialising in stock shortages and cost reduction. We source hard-to-find parts and identify compliant alternatives across a catalogue of 410,000+ components from 500+ manufacturers.

Learn more →

Stock Shortage Specialist

When a component is unavailable, discontinued or has an unacceptable lead time, we tap into our network of vetted European and Asian distributors to source what you need — without compromising on quality or traceability.

Request a quote →

Compliant Alternatives

We identify pin-to-pin, electrically equivalent substitutes that meet the same certifications (RoHS, AEC-Q100, REACH) as your original specification — validated against datasheets, not just part numbers. Often at a lower cost.

BOM Analysis service →