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STMicroelectronics STPS40SM120CTN
- Part No.:
- STPS40SM120CTN
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
STPS40SM120CTN.pdf
- Description:
- DIODE ARR SCHOT 120V 20A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
STPS40SM120CTN from STMicroelectronics is a dual common-cathode 120 V, 2 × 20 A average forward current Schottky rectifier in TO-220AB package, featuring 0.63 V typical forward voltage at 125 °C and 150 °C maximum junction temperature - optimized for high-efficiency notebook and desktop AC/DC adapters.
For engineers reviewing the STPS40SM120CTN datasheet, STPS40SM120CTN pinout, STPS40SM120CTN application, or STPS40SM120CTN equivalent, key selection criteria include avalanche rating (1150 W), thermal resistance (0.93 °C/W total junction-to-case), low leakage (<50 mA at 125 °C), and ECOPACK®2 compliance for industrial power conversion designs.
Technical Context
This dual-diode Schottky rectifier integrates two independent 120 V, 20 A per diode elements in a single TO-220AB thermally enhanced package with common cathode configuration. Its low VF–IR trade-off targets medium-power, high-density SMPS where conduction loss minimization and thermal stability under dynamic load are critical.
The device supports simultaneous conduction of both diodes with coupled thermal behavior modeled by Rth(j-c) = 1.35 °C/W per diode and Rth(c) = 0.50 °C/W coupling resistance. Avalanche-rated operation enables robustness against inductive switching transients in DC/DC converter freewheeling paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 120 V - blocks reverse voltage up to 120 V without breakdown in adapter PFC or secondary-side rectification |
| IF(AV) | 2 × 20 A - delivers 40 A total average forward current (20 A per diode) at TC = 115 °C for dual-rail output designs |
| VF (typ.) | 0.63 V @ 125 °C, IF = 20 A - reduces conduction loss to ~12.6 W per diode at full load, enabling >90% efficiency in 65 W+ adapters |
| Tj (max.) | 150 °C - allows sustained operation under high ambient + self-heating conditions in compact enclosed adapters |
| Rth(j-c) | 0.93 °C/W total - enables direct heatsink mounting with <15 °C temperature rise at 40 W dissipation |
| IR (max) | 50 mA @ 125 °C, VR = 120 V - limits standby leakage power to <6 mW per diode in no-load adapter modes |
| PARM | 1150 W @ tp = 10 µs - withstands repetitive avalanche energy during MOSFET turn-off in synchronous rectifier circuits |
Pinout & Package
TO-220AB package: insulated case, vertical mounting, screw-down heatsink interface (recommended torque 0.55 N·m), epoxy meeting UL 94 V0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| K (Tab) | Common Cathode | Electrically connected to heatsink; must be isolated from chassis ground unless circuit design requires cathode-referenced thermal path |
| A1 | Anode 1 | Input terminal for first diode leg - used for primary-side synchronous rectification or dual-output rail generation |
| A2 | Anode 2 | Input terminal for second diode leg - enables independent control or parallel operation with Anode 1 in interleaved topologies |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche rated | 1150 W peak repetitive avalanche power ensures reliability during transient overvoltage events in unregulated DC/DC stages |
| Low VF at high Tj | 0.63 V typ. @ 125 °C enables stable conduction loss across full operating temperature range without derating |
| ECOPACK®2 compliant | Meets RoHS, halogen-free, and lead-free soldering requirements for global industrial and consumer certifications |
| High-frequency operation | Negligible reverse recovery charge (Qrr ≈ 0) eliminates switching losses in >100 kHz SMPS designs |
Applications
| Notebook AC/DC Adapter | Desktop Power Supply |
|---|---|
Use Scenario: Secondary-side synchronous rectification in 45–90 W ultra-thin laptop adapters with tight thermal envelopes. IC Role / Device Role / Timing Role: Dual-anode Schottky rectifier replacing two discrete diodes to reduce board area and thermal coupling. Use Value: 0.63 V VF at 125 °C cuts conduction loss by ~22% vs. standard 150 V Schottkys, extending battery charging efficiency. | Use Scenario: Dual-rail +12 V/+5 V output rectification in ATX-style desktop PSUs with shared heatsink layout. IC Role / Device Role / Timing Role: Common-cathode dual diode providing independent anode routing for separate regulation loops. Use Value: 0.93 °C/W total Rth(j-c) enables 40 A combined current handling with <10 °C ΔT on standard 10 cm² heatsink. |
| Gaming Console Power Module | LED Driver Power Stage |
Use Scenario: High-pulse-current freewheeling path in resonant LLC converters powering game consoles with dynamic load profiles. IC Role / Device Role / Timing Role: Avalanche-rated Schottky absorbing inductive kickback during MOSFET dead-time transitions. Use Value: 1150 W avalanche power rating sustains 210 A non-repetitive surge without degradation over 10⁶ cycles. | Use Scenario: Constant-current output rectification in high-brightness LED drivers for commercial lighting with 120 V input. IC Role / Device Role / Timing Role: Low-leakage (50 mA max @ 125 °C) Schottky minimizing standby power in always-on LED systems. Use Value: <50 mA IR at elevated temperature prevents thermal runaway in sealed LED housings above 70 °C ambient. |
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 | Same 120 V VRRM, 40 A total IF(AV), but TO-247 package; Rth(j-c) = 1.0 °C/W (slightly higher thermal resistance) | Requires larger PCB footprint and different heatsink interface; better suited for open-frame industrial PSUs | Select when mechanical compatibility with TO-247 sockets is required and thermal margin >0.1 °C/W is acceptable |
| ON Semiconductor MBR40120CT | Identical TO-220AB package and pinout; VF = 0.72 V typ. @ 125 °C (90 mV higher), IR = 100 mA @ 125 °C (2× leakage) | Lower efficiency and higher standby loss in thermally constrained adapters | Select only if STPS40SM120CTN is unavailable and efficiency loss <1% is acceptable in target application |
Compared with VS-40CPH12 and MBR40120CT, STPS40SM120CTN delivers superior thermal performance (0.93 °C/W), lower conduction loss (0.63 V VF), and tighter leakage control (50 mA), making it optimal for space-constrained, high-efficiency consumer power adapters.
Availability
STPS40SM120CTN is available at Aetrix Electronics and suitable for notebook adapters, desktop power supplies, gaming console modules, and LED driver power stages requiring stable component supply and long-term industrial availability.
Supply support for STPS40SM120CTN 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 industrial, automotive, and consumer markets.
The STPS Schottky rectifier product line targets high-efficiency AC/DC and DC/DC conversion, emphasizing low VF, avalanche ruggedness, and thermally optimized packaging for compact power supplies.
FAQ
Is STPS40SM120CTN pin-compatible with STPS40SM120C?
Yes - STPS40SM120CTN and STPS40SM120C share identical TO-220AB package outline, pin assignment (A1/A2/K), and mechanical dimensions. The "N" suffix denotes tape-and-reel packaging per ST's internal ordering convention; electrical and thermal specifications are fully identical.
What is the maximum continuous power dissipation per diode at TC = 115 °C?
At TC = 115 °C and δ = 0.5 duty cycle, each diode supports 20 A IF(AV), resulting in ~12.6 W conduction loss using the formula P = 0.52 × IF(AV) + 0.0085 × IF²(RMS). Total device dissipation is ≤25.2 W with proper heatsinking.
Can STPS40SM120CTN be used in synchronous rectification topologies?
Yes - its zero reverse recovery charge (Qrr ≈ 0) and fast switching enable use as a passive synchronous rectifier replacement in flyback, LLC, and forward converters. Gate drive timing must avoid shoot-through, but no body diode conduction penalty exists.
Does the common cathode configuration require isolation from the heatsink?
Yes - the metal tab (K) is electrically connected to the common cathode. When mounted to a conductive heatsink, electrical isolation (e.g., mica washer + thermal grease or isolating pad) is mandatory unless the system design intentionally references the cathode to heatsink potential.
STPS40SM120CTN 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):
- 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:
- TO-220AB Narrow Leads
STPS40SM120CTN FAQ
1.How can I place an order for STPS40SM120CTN through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS40SM120CTN 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 STPS40SM120CTN reliable?
The price and inventory of STPS40SM120CTN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40SM120CTN is usually 5 days.
3.What payment methods are accepted for STPS40SM120CTN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40SM120CTN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS40SM120CTN?
STPS40SM120CTN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS40SM120CTN 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 STPS40SM120CTN?
For technical support, including STPS40SM120CTN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40SM120CTN requirements.
6.How does Aetrix verify that STPS40SM120CTN is sourced from the original manufacturer or authorized distributors?
All STPS40SM120CTN 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 STPS40SM120CTN meets industry standards.
7.What is the process for return or replacement of STPS40SM120CTN?
All STPS40SM120CTN units undergo pre-shipment inspection (PSI). If there is an issue with STPS40SM120CTN, 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 STPS40SM120CTN part is unused and in its original packaging.
Return procedure for STPS40SM120CTN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS40SM120CTN Tags
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BAV99-7-F
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BAT54C-7-F
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BAV99,215
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BAT54S-7-F
Diodes Incorporated
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