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STMicroelectronics STPS40SM80CT
- Part No.:
- STPS40SM80CT
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
STPS40SM80CT.pdf
- Description:
- DIODE ARRAY SCHOT 80V 20A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:32
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Product details
Overview
STPS40SM80CT from STMicroelectronics is a dual common-cathode Schottky rectifier in TO-220AB package, rated for 80 V repetitive peak reverse voltage and 2 × 20 A average forward current per diode at Tc = 145 °C. It delivers typ. 520 mV forward voltage at 10 A/25 °C, features 175 °C max junction temperature, and is optimized for high-frequency SMPS in notebook adapters and LCD TV power supplies.
For engineers reviewing the STPS40SM80CT datasheet, STPS40SM80CT pinout, STPS40SM80CT application, or STPS40SM80CT equivalent, key selection criteria include low VF vs. leakage trade-off, avalanche-rated ruggedness (100 V, 28.5 A), insulated thermal performance (Rth(j–c) = 1.60 °C/W per diode), and TO-220AB mechanical compatibility with standard heatsinks.
Technical Context
This dual Schottky rectifier integrates two independent anodes sharing a common cathode terminal, enabling synchronous or interleaved conduction paths in center-tapped or dual-output DC–DC converters. Its silicon design emphasizes low forward voltage drop without compromising reverse leakage-typ. 50 µA at 25 °C and 30 mA at 125 °C under full VRRM.
The device is avalanche-rated (PARM = 9500 W, tp = 1 µs) and qualified for operation up to 175 °C junction temperature, with thermal resistance Rth(j–c) = 1.60 °C/W per diode in TO-220AB. Package insulation (2000 V) and low capacitance (45 pF) support noise-sensitive high-frequency switching environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 80 V - Maximum repetitive reverse blocking voltage per diode; defines safe operating range in flyback or buck-boost topologies. |
| IF(AV) per diode | 20 A at Tc = 145 °C - Continuous DC current handling per anode; enables compact thermal design in high-power adapters. |
| VF (typ) | 520 mV at IF = 10 A, Tj = 25 °C - Low conduction loss directly reduces power dissipation and improves efficiency at light-to-moderate loads. |
| IR (max) | 30 mA at Tj = 125 °C, VR = VRRM - Controlled leakage ensures stable operation in high-temperature environments without thermal runaway risk. |
| Tj (max) | 175 °C - Enables reliable operation in thermally constrained enclosures such as ultra-thin laptop adapters. |
| Rth(j–c) per diode | 1.60 °C/W - Predictable thermal path from junction to case supports accurate heatsink sizing and derating calculations. |
| VRMS rating | 30 A - RMS current capability confirms suitability for pulsed or PWM-driven applications with high crest factors. |
Pinout & Package
TO-220AB package with isolated mounting tab (2000 V insulation), 3-terminal configuration: two anodes (A1, A2) and one shared cathode (K). Mounting hole accepts M3 screw with 0.4–0.6 N·m torque. Tab is electrically connected to cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Anode 1 | Input terminal for first diode path; used independently or in parallel with A2 for higher current capability. |
| A2 | Anode 2 | Input terminal for second diode path; enables dual-output or phase-interleaved converter designs. |
| K | Common Cathode | Shared output node; connects to system ground or negative rail; tab is electrically tied to K and must be insulated if mounted to chassis. |
Key Features
| Feature | Design Value |
|---|---|
| Optimized VF–IR trade-off | 520 mV VF @ 10 A / 50 µA IR @ 25 °C enables >92% efficiency in 19 V/4.74 A notebook adapters without forced air cooling. |
| Avalanche energy rating | 9500 W PARM (tp = 1 µs) provides robustness against transient overvoltage events in unregulated input stages. |
| High-temperature operation | 175 °C Tj(max) allows sustained 20 A conduction in ambient temperatures up to 85 °C with minimal derating. |
| Insulated TO-220AB package | 2000 V isolation and 45 pF capacitance reduce EMI coupling and simplify safety-compliant heatsink mounting. |
| Low thermal resistance | 1.60 °C/W Rth(j–c) per diode permits direct bolt-down heatsinking without thermal interface pads in most industrial adapter designs. |
Applications
| Notebook AC–DC Adapter | LCD TV Power Supply |
|---|---|
|
Use Scenario: Secondary-side rectification in 19 V/4.74 A laptop adapter operating at 100–300 kHz switching frequency. IC Role / Device Role / Timing Role: Dual-anode Schottky rectifier providing synchronous rectification for two independent +19 V outputs. Use Value: 520 mV VF minimizes conduction loss at 10 A load, reducing thermal stress on heatsink and enabling fanless design. |
Use Scenario: Output rectification in 24 V/8 A and 12 V/3 A dual-rail power supply for 43″ LCD TV main board. IC Role / Device Role / Timing Role: Common-cathode dual diode delivering independent current paths for two regulated DC rails. Use Value: 2 × 20 A IF(AV) rating supports simultaneous full-load operation of both rails without thermal throttling. |
| Game Console Power Adapter | Desktop PC Standby Supply |
|
Use Scenario: High-efficiency 12 V/10 A auxiliary rail in gaming console external power brick with tight thermal envelope. IC Role / Device Role / Timing Role: Primary secondary-side rectifier handling peak pulsed currents up to 200 A (10 ms surge). Use Value: Avalanche rating (100 V, 28.5 A) withstands inductive kickback during sudden load transients without failure. |
Use Scenario: +5 VSB rectification in ATX desktop PSU standby circuit operating continuously at 2.5 A. IC Role / Device Role / Timing Role: Low-leakage Schottky diode minimizing no-load power consumption in always-on subsystem. Use Value: 50 µA IR @ 25 °C ensures <10 mW standby loss, meeting Energy Star 7.0 requirements for idle power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-40CPQ080PbF | Same VRRM (80 V), IF(AV) = 2 × 20 A, but VF = 620 mV @ 10 A - 100 mV higher conduction loss. | Higher VF increases thermal load in space-constrained adapters; requires larger heatsink for same output power. | Select when cost sensitivity outweighs 3–5% efficiency penalty and thermal margin is available. |
| ON Semiconductor MBRS4080CT | Identical TO-220AB package and pinout; VF = 590 mV @ 10 A, IR = 100 µA @ 125 °C - higher leakage than ST part. | Elevated IR may cause instability in high-temp standby circuits; less suitable for 24/7 operation above 100 °C. | Prefer for cost-driven consumer designs where leakage impact is mitigated by active cooling or lower ambient temps. |
Compared with VS-40CPQ080PbF and MBRS4080CT, STPS40SM80CT offers the lowest VF–IR balance (520 mV / 30 mA), making it optimal for thermally aggressive, high-efficiency adapter designs requiring long-term reliability at elevated junction temperatures.
Availability
STPS40SM80CT is available at Aetrix Electronics and suitable for notebook AC–DC adapters, LCD TV power supplies, and game console external power bricks requiring stable component supply across multi-year production cycles.
Supply support for STPS40SM80CT 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 analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
This device belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-frequency switch-mode power conversion where low VF, high Tj, and avalanche ruggedness are critical for adapter and open-frame PSU reliability.
FAQ
Is STPS40SM80CT RoHS-compliant and halogen-free?
Yes. STPS40SM80CT is manufactured in ST's ECOPACK®-compliant TO-220AB package, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. The epoxy molding compound is UL94 V0 rated, and full material declarations are available in ST's official ECOPACK® database.
Can STPS40SM80CT replace single-diode TO-220 Schottky rectifiers in existing designs?
No - STPS40SM80CT is a dual-anode, common-cathode device with three terminals (A1, A2, K). Replacing a single-diode part (e.g., STPS20L45CG) requires PCB layout revision to accommodate the extra anode pad and verify thermal coupling between both diodes on the shared heatsink.
What is the maximum recommended heatsink thermal resistance for continuous 2 × 20 A operation?
At Tc = 145 °C and ambient 50 °C, with Rth(j–c) = 1.60 °C/W per diode and total dissipation ≈ 14.4 W (based on VF ≈ 0.72 V @ 20 A), the required Rth(c–a) must be ≤ 6.9 °C/W to maintain Tj ≤ 175 °C. A heatsink with Rth ≤ 5.0 °C/W is recommended for margin.
Does STPS40SM80CT support paralleling of A1 and A2 terminals for single-path 40 A operation?
Yes - A1 and A2 may be paralleled externally to achieve 40 A IF(AV) per device, provided symmetrical PCB trace routing, matched thermal paths, and current-sharing resistors (if needed) are implemented. Derating to 36 A is advised for long-term reliability due to minor VF mismatch (<5%) between diodes.
STPS40SM80CT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 80 V
- Current - Average Rectified (Io) (per Diode):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 800 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 50 µA @ 80 V
- Operating Temperature - Junction:
- 175°C (Max)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
STPS40SM80CT FAQ
1.How can I place an order for STPS40SM80CT through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS40SM80CT 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 STPS40SM80CT reliable?
The price and inventory of STPS40SM80CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40SM80CT is usually 5 days.
3.What payment methods are accepted for STPS40SM80CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40SM80CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS40SM80CT?
STPS40SM80CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS40SM80CT 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 STPS40SM80CT?
For technical support, including STPS40SM80CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40SM80CT requirements.
6.How does Aetrix verify that STPS40SM80CT is sourced from the original manufacturer or authorized distributors?
All STPS40SM80CT 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 STPS40SM80CT meets industry standards.
7.What is the process for return or replacement of STPS40SM80CT?
All STPS40SM80CT units undergo pre-shipment inspection (PSI). If there is an issue with STPS40SM80CT, 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 STPS40SM80CT part is unused and in its original packaging.
Return procedure for STPS40SM80CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS40SM80CT Tags
-
BAV99-7-F
Diodes Incorporated
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BAT54C-7-F
Diodes Incorporated
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BAV99,215
Nexperia USA Inc.
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BAT54SLT1G
onsemi
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BAV70LT1G
onsemi
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BAT54CLT1G
onsemi
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BAT54S-7-F
Diodes Incorporated
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BAV99LT1G
onsemi
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BAT54S,215
Nexperia USA Inc.
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BAS40-04LT1G
onsemi
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MMBD1503-TP
Micro Commercial Co
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BAV99WT1G
onsemi
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