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STMicroelectronics STPS40SM120CR
- Part No.:
- STPS40SM120CR
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-262-3 Long Leads, I2PAK, TO-262AA
- Datasheet:
-
STPS40SM120CR.pdf
- Description:
- DIODE ARRAY SCHOT 120V 20A I2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:985
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Product details
Overview
STPS40SM120CR from STMicroelectronics is a dual common-cathode 120 V, 2 × 20 A average forward current Schottky rectifier in I²PAK package, featuring 0.63 V typical forward voltage at 125 °C/20 A, 150 °C max junction temperature, and avalanche-rated ruggedness-optimized for high-frequency SMPS in notebook adapters and DC/DC converters.
For engineers reviewing the STPS40SM120CR datasheet, STPS40SM120CR pinout, STPS40SM120CR application, or STPS40SM120CR equivalent, this device supports thermal-aware high-efficiency power conversion where low conduction loss, fast switching, and robust surge handling are critical in compact AC-DC and isolated DC-DC topologies.
Technical Context
This dual-diode Schottky rectifier integrates two independent 120 V, 20 A (per diode) junctions sharing a common cathode terminal, enabling synchronous or interleaved operation in center-tapped or full-wave bridge configurations. Its low VF–IR trade-off targets medium-power, high-density adapters requiring stable efficiency across light-to-full load.
Designed for conduction-limited thermal management, it delivers 0.93 °C/W total junction-to-case thermal resistance with validated avalanche capability up to 1150 W (10 µs pulse), supporting transient overvoltage resilience without external snubbers in flyback and LLC resonant converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 120 V - Maximum repetitive reverse blocking voltage per diode; enables use in 100–120 VAC input-derived 12–24 V output SMPS without derating. |
| IF(AV) | 2 × 20 A - Average forward current rating per diode at TC = 115 °C; supports 40 A total device current in dual-phase or parallel-output designs. |
| VF (typ.) | 0.63 V @ 125 °C / 20 A - Low conduction loss directly reduces power dissipation and improves full-load efficiency in high-current adapter rails. |
| Tj(max) | 150 °C - Maximum operating junction temperature; allows sustained operation under high ambient or thermally constrained PCB layouts. |
| Rth(j-c) | 0.93 °C/W (total) - Junction-to-case thermal resistance enables predictable heatsink sizing for I²PAK-mounting in space-constrained notebook adapter assemblies. |
| IFSM | 210 A (10 ms sine) - Non-repetitive surge rating supports inrush current handling during cold-start of AC-DC supplies without degradation. |
| PARM | 1150 W @ 10 µs - Repetitive peak avalanche power rating confirms robustness against voltage spikes in discontinuous-mode flyback converters. |
Pinout & Package
The STPS40SM120CR is housed in an I²PAK (TO-263AB) surface-mount package with three terminals: two anodes (A1, A2) and one common cathode (K). The package features UL 94 V0 epoxy, copper leadframe, and optimized thermal pad for PCB conduction cooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Anode 1 | Input terminal for first Schottky diode; connects to transformer secondary or switch node in dual-output or interleaved converter. |
| A2 | Anode 2 | Input terminal for second Schottky diode; enables independent control or phase-splitting in multi-rail or redundant power paths. |
| K | Common Cathode | Shared output node delivering combined rectified current; simplifies PCB routing and reduces loop inductance in high-frequency outputs. |
Key Features
| Feature | Design Value |
|---|---|
| High current capability | 2 × 20 A average forward current per diode enables dual-rail 24 V/3 A and 12 V/5 A outputs in single-package adapter designs. |
| Avalanche rated | 1150 W repetitive avalanche power (10 µs) ensures reliable operation during voltage transients without clamping circuitry in flyback topologies. |
| Low forward voltage drop | 0.63 V typical at 125 °C/20 A reduces conduction loss by ~25% vs. comparable 150 V Si diodes, improving full-load efficiency by 1.2–1.8%. |
| High frequency operation | Negligible reverse recovery charge (Qrr ≈ 0) eliminates switching loss and EMI associated with minority-carrier diodes above 100 kHz. |
| ECOPACK®2 compliant | Halogen-free, RoHS-compliant construction meets global environmental requirements for consumer electronics and computing power supplies. |
Applications
| Switching Power Supply | LED Driver |
|---|---|
Use Scenario: High-density 65 W notebook AC-DC adapter with dual-output (20 V + 5 V) using active-clamp flyback topology. IC Role / Device Role / Timing Role: Output rectifier for both secondary windings, leveraging common-cathode configuration to minimize layout area and parasitic inductance. Use Value: 0.63 V VF reduces conduction loss by 1.7 W per diode versus standard 120 V Schottky alternatives, enabling >91% full-load efficiency at 50 °C ambient. |
Use Scenario: Constant-current LED driver for commercial downlight modules with 36 V string and 700 mA output. IC Role / Device Role / Timing Role: Synchronous rectifier in buck-derived constant-current stage, replacing MOSFET+driver for simplified control and lower BOM count. Use Value: Zero reverse recovery eliminates switching noise coupling into analog current sense path, improving dimming linearity and reducing EMI filter size by 30%. |
| Desktop PC PSU | Game Console Power Module |
Use Scenario: +12 V rail rectification in ATX v2.4 compliant 500 W PSU using double-forward topology with center-tapped secondary. IC Role / Device Role / Timing Role: Dual-anode configuration used as center-tapped full-wave rectifier, eliminating need for two discrete devices and associated layout asymmetry. Use Value: Matched VF between A1 and A2 diodes (<±3%) ensures balanced current sharing and prevents thermal runaway under asymmetric loading. |
Use Scenario: 19 V/4.74 A auxiliary power module for next-gen game console motherboard with strict 15 mm height constraint. IC Role / Device Role / Timing Role: Primary output rectifier mounted on bottom-side PCB layer with direct thermal pad to internal copper plane, exploiting I²PAK's 0.93 °C/W Rth(j-c). Use Value: 150 °C Tj(max) and avalanche rating allow safe operation at 110 °C case temperature during sustained 4K video rendering loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-40CPH12 | Single-diode TO-247 package; 120 V/40 A single-anode rating; higher Rth(j-c) (1.2 °C/W); no common-cathode configuration. | Requires two devices for dual-output designs; less suitable for space-constrained PCBs needing shared cathode routing. | Select when single-rail high-current output dominates and thermal margin allows larger heatsink footprint. |
| ON Semiconductor MBR40120CT | TO-220AB dual common-cathode; identical 120 V/2×20 A rating; VF = 0.72 V @ 125 °C/20 A; no avalanche rating specified. | Lacks documented avalanche capability; may require external TVS protection in flyback circuits with high leakage inductance. | Prefer for cost-sensitive, non-avalanche-critical applications like basic LED drivers where thermal margin exceeds 20 °C. |
Compared with VS-40CPH12 and MBR40120CT, STPS40SM120CR uniquely combines I²PAK surface-mount compatibility, matched dual-diode VF, and certified avalanche ruggedness-making it optimal for thermally dense, high-reliability notebook and gaming adapter designs where layout simplicity and transient immunity are non-negotiable.
Availability
STPS40SM120CR is available at Aetrix Electronics and suitable for notebook adapters, game console power modules, and desktop PC PSUs requiring stable component supply, consistent thermal performance, and long-term industrial lifecycle support.
Supply support for STPS40SM120CR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The STPS40SM120CR belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for high-frequency, medium-power AC-DC and DC-DC conversion where low VF, thermal robustness, and avalanche safety are essential.
FAQ
What is the maximum allowable case temperature for continuous operation?
The STPS40SM120CR supports continuous operation up to 115 °C case temperature (TC) when delivering its full 40 A device rating, as specified in the Absolute Ratings table. Exceeding this requires derating per Figure 2 in DS8940, which shows linear reduction to 20 A at 125 °C TC for each diode.
Can STPS40SM120CR be used in parallel with another unit for higher current?
No-parallel operation is not recommended due to VF mismatch between units, which causes current imbalance and thermal runaway. For higher current, use a single higher-rated device such as STPS60SM120C (60 A total), or redesign with interleaved phases using separate transformers.
Is the I²PAK package lead-free and RoHS-compliant?
Yes-the STPS40SM120CR is manufactured in an ECOPACK®2-compliant I²PAK package, meeting RoHS Directive 2011/65/EU and being halogen-free, with lead-free solderability verified per J-STD-020D.3 and JEDEC Level 3 moisture sensitivity.
How does the avalanche rating impact design in flyback converters?
The 1150 W repetitive avalanche power rating (at 10 µs, Tj = 125 °C) allows the STPS40SM120CR to absorb energy from transformer leakage inductance spikes without failure-eliminating the need for external RCD snubbers in most 65–100 W flyback designs and reducing component count and board area.
STPS40SM120CR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-262-3 Long Leads, I2PAK, TO-262AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 120 V
- Current - Average Rectified (Io) (per Diode):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 830 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 275 µA @ 120 V
- Operating Temperature - Junction:
- 150°C (Max)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- I2PAK
STPS40SM120CR FAQ
1.How can I place an order for STPS40SM120CR through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS40SM120CR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STPS40SM120CR reliable?
The price and inventory of STPS40SM120CR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40SM120CR is usually 5 days.
3.What payment methods are accepted for STPS40SM120CR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40SM120CR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS40SM120CR?
STPS40SM120CR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS40SM120CR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STPS40SM120CR?
For technical support, including STPS40SM120CR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40SM120CR requirements.
6.How does Aetrix verify that STPS40SM120CR is sourced from the original manufacturer or authorized distributors?
All STPS40SM120CR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STPS40SM120CR meets industry standards.
7.What is the process for return or replacement of STPS40SM120CR?
All STPS40SM120CR units undergo pre-shipment inspection (PSI). If there is an issue with STPS40SM120CR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STPS40SM120CR part is unused and in its original packaging.
Return procedure for STPS40SM120CR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS40SM120CR Tags
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BAV99-7-F
Diodes Incorporated
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BAT54C-7-F
Diodes Incorporated
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Nexperia USA Inc.
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Diodes Incorporated
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Nexperia USA Inc.
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BAS40-04LT1G
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MMBD1503-TP
Micro Commercial Co
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