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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

STMicroelectronics STPS40M120CR

Name: STPS40M120CR
Brand: STMicroelectronics
SKU: STPS40M120CR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS40M120CR

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: TO-262-3 Long Leads, I2PAK, TO-262AA

Datasheet:: STPS40M120CR.pdf

Description:: DIODE ARRAY SCHOT 120V 20A I2PAK

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Product details

Overview

STPS40M120CR from STMicroelectronics is a dual common-cathode 120 V, 40 A (total) Schottky rectifier in TO-220AB package, optimized for high-frequency SMPS in notebook/desktop adapters and LED lighting. It delivers typ. 0.61 V forward voltage at 125 °C/20 A per diode, supports 220 A non-repetitive surge current, and features avalanche-rated ruggedness with 150 °C max junction temperature.

For engineers reviewing the STPS40M120CR datasheet, STPS40M120CR pinout, STPS40M120CR application, or STPS40M120CR equivalent, key selection criteria include forward voltage vs. leakage trade-off at 125 °C, thermal resistance (R_th(j-c) = 0.80 °C/W total), dual-diode parallel conduction capability, and ECOPACK®2 compliance for industrial power supply design.

Technical Context

This dual Schottky rectifier integrates two independent 20 A diodes sharing a common cathode terminal, enabling synchronous or interleaved operation in center-tapped or dual-output DC/DC converters. Its low VF (0.44–0.67 V typ. across 5–20 A, 25–125 °C) minimizes conduction loss, while low junction capacitance (~1000 pF at 0 V) supports >1 MHz switching.

The device is avalanche-rated to 1600 W peak (10 µs pulse, T_j = 125 °C) and exhibits controlled reverse leakage (≤70 mA at 125 °C/V_RRM), making it suitable for thermally constrained adapter designs where reliability under transient overvoltage and high ambient temperature is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	120 V - Withstands repetitive reverse voltage up to 120 V without breakdown in SMPS flyback or boost stages.
I_F(AV)	40 A total (2 × 20 A) - Supports high-output-current adapter designs with dual-diode parallel conduction path.
V_F (typ.)	0.61 V @ 20 A, 125 °C - Enables <1.2 W conduction loss per diode at full load, improving efficiency in compact 65–100 W adapters.
R_th(j-c)	0.80 °C/W total - Allows direct heatsink mounting for thermal management; junction-to-case path enables predictable derating above 120 °C ambient.
I_FSM	220 A (10 ms sine) - Withstands inrush and short-circuit surges in AC-DC front-end and DC/DC input stages.
T_j(max)	150 °C - Permits operation in sealed enclosures or high-ambient environments (e.g., gaming adapters) without forced air cooling.
ECOPACK®2	Compliant - Meets RoHS, halogen-free, and lead-free soldering requirements for global industrial and consumer shipments.

Pinout & Package

Packed in TO-220AB: insulated plastic case with metal tab (cathode-connected), three leads (K–A1–A2), UL 94 V0 epoxy, and recommended mounting torque of 0.55 N·m.

Pin/Terminal	Circuit Role	Design Meaning
K (Tab)	Common cathode	Electrically connected to metal tab; must be isolated from heatsink unless referenced to system ground; primary thermal path.
A1	Anode 1	Independent anode for first diode; used in dual-output or phase-split configurations (e.g., dual-rail DC/DC).
A2	Anode 2	Independent anode for second diode; enables redundancy, current sharing, or interleaved switching with A1.

Key Features

Feature	Design Value
High current capability	40 A total average forward current (2 × 20 A) enables single-package replacement of discrete dual-diode solutions in space-constrained adapters.
Avalanche rated	1600 W peak avalanche power (10 µs, T_j = 125 °C) provides robustness against voltage transients in unregulated or lightly loaded SMPS conditions.
Low forward voltage drop	0.61 V typ. @ 20 A/125 °C reduces conduction loss by ~15% vs. comparable 120 V Schottkys, directly improving full-load efficiency in 19 V/3.4 A+ notebook supplies.
High frequency operation	Junction capacitance ≤1000 pF @ 0 V enables stable operation up to 1 MHz, supporting modern GaN-based high-switching-frequency DC/DC topologies.
ECOPACK®2 compliant	Halogen-free, RoHS-compliant construction meets IEC 61249-2-21 and JEDEC J-STD-020 standards for lead-free reflow and environmental safety.

Applications

Notebook AC Adapter

LED Driver Power Stage

Use Scenario: 65–90 W universal-input AC/DC adapter for ultrabooks with dual 12 V/5 V outputs.

IC Role / Device Role / Timing Role: Output rectifier in synchronous flyback secondary side, conducting during MOSFET off-time.

Use Value: Dual-anode configuration allows independent winding coupling, reducing cross-regulation error and enabling tighter output voltage tolerance (<±2%).

Use Scenario: Constant-current LED driver for commercial downlights with 48 V bus and 350 mA–700 mA output.

IC Role / Device Role / Timing Role: Freewheeling diode in buck converter stage, clamping inductive kickback during switch-off.

Use Value: Low V_F minimizes heat generation in enclosed fixtures, extending LED lifetime and maintaining lumen output over 50,000-hour rating.

Desktop PC Power Supply

Gaming Console Power Module

Use Scenario: +12 V rail rectification in ATX PSUs with active PFC front-end and LLC resonant converter.

IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacing MOSFETs in cost-sensitive mid-tier platforms.

Use Value: Eliminates gate drive complexity and timing control while delivering comparable efficiency (>90%) at 20–100% load range.

Use Scenario: High-density 12 V/20 A auxiliary rail in next-gen game station power modules operating at 50 °C ambient.

IC Role / Device Role / Timing Role: Primary output rectifier in multi-phase buck converter feeding GPU VRM input.

Use Value: 150 °C T_j(max) and 0.80 °C/W R_th(j-c) allow sustained 40 A conduction without thermal throttling in fanless chassis designs.

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 40 A, 120 V; R_th(j-c) = 1.0 °C/W; V_F = 0.65 V @ 20 A/125 °C.	Lacks dual-anode topology; requires two devices for same functionality; higher thermal resistance limits power density.	Select when board layout permits discrete placement and thermal margin exceeds 10 °C.
ON Semiconductor MBR40120CT	Dual 40 A, 120 V; V_F = 0.72 V @ 20 A/125 °C; no avalanche rating; R_th(j-c) = 0.95 °C/W.	Higher conduction loss and no surge ruggedness; unsuitable for unregulated or transient-prone inputs.	Select only for cost-driven, low-stress applications with ample heatsinking and stable line conditions.

Compared with VS-40CPH12 and MBR40120CT, STPS40M120CR offers superior thermal performance (0.80 °C/W), lower forward drop (0.61 V), and verified avalanche capability-critical for high-reliability, high-power-density adapter and gaming PSU designs.

Availability

STPS40M120CR is available at Aetrix Electronics and suitable for notebook AC adapters, LED driver power stages, and desktop PC power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STPS40M120CR 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The STPS series targets high-efficiency, high-reliability power conversion; STPS40M120CR specifically addresses the thermal and electrical demands of compact, high-frequency AC/DC and DC/DC converters in portable and entertainment electronics.

FAQ

Is STPS40M120CR pin-compatible with STPS30M120C?

No. STPS30M120C is a 30 A dual-diode variant in the same TO-220AB package with identical pinout (K–A1–A2), but STPS40M120CR has higher current rating and revised thermal design. Mechanical fit is identical, but layout must verify copper pour and heatsink interface for 40 A conduction.

What is the maximum continuous power dissipation per diode at 100 °C ambient?

At T_amb = 100 °C with R_th(j-a) ≈ 2.5 °C/W (estimated from R_th(j-c) = 1.10 °C/W and typical heatsink R_th(c-a) = 1.4 °C/W), max P_D per diode is ~22 W. This supports ~18 A average forward current per diode using the conduction loss equation P = 0.54×I_F(AV) + 0.0065×I_F(RMS)².

Does STPS40M120CR require a heatsink in a 65 W notebook adapter?

Yes. At 20 A per diode and 0.61 V V_F, conduction loss is ~12.2 W per diode. Without a heatsink, junction temperature would exceed 150 °C even at 25 °C ambient. A minimum 15 cm² aluminum heatsink (0.5 °C/W) is recommended to maintain T_j ≤ 130 °C at full load.

Can STPS40M120CR be used in place of a single 40 A Schottky like STPS40H120CG?

No. STPS40H120CG is a single-anode 40 A device in TO-247 package. STPS40M120CR is dual-anode with common cathode; substituting it requires circuit redesign to accommodate two independent anodes and shared cathode connection-unsuitable for single-diode topologies like standard flyback or boost.

STPS40M120CR 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:: 790 mV @ 20 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 370 µA @ 120 V

Operating Temperature - Junction:: 150°C (Max)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: I2PAK

STPS40M120CR FAQ

1.How can I place an order for STPS40M120CR through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS40M120CR 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 STPS40M120CR reliable?

The price and inventory of STPS40M120CR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40M120CR is usually 5 days.

3.What payment methods are accepted for STPS40M120CR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40M120CR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS40M120CR?

STPS40M120CR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS40M120CR 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 STPS40M120CR?

For technical support, including STPS40M120CR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40M120CR requirements.

6.How does Aetrix verify that STPS40M120CR is sourced from the original manufacturer or authorized distributors?

All STPS40M120CR 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 STPS40M120CR meets industry standards.

7.What is the process for return or replacement of STPS40M120CR?

All STPS40M120CR units undergo pre-shipment inspection (PSI). If there is an issue with STPS40M120CR, 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 STPS40M120CR part is unused and in its original packaging.

Return procedure for STPS40M120CR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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