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

STMicroelectronics STPS40L40CW

Name: STPS40L40CW
Brand: STMicroelectronics
SKU: STPS40L40CW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS40L40CW

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: TO-247-3

Datasheet:: STPS40L40CW.pdf

Description:: DIODE ARR SCHOTT 40V 20A TO247-3

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Product details

Overview

STPS40L40CW from STMicroelectronics is a dual center-tap Schottky barrier rectifier optimized for high-frequency switched-mode power supplies and DC-DC converters. It delivers 40 A total average forward current (2 × 20 A per diode), 40 V repetitive peak reverse voltage, and ultra-low 0.49 V max forward voltage at 125°C/20 A - enabling minimal conduction loss in low-voltage, high-efficiency power stages such as server VRMs and telecom rectifiers.

For engineers reviewing the STPS40L40CW datasheet, STPS40L40CW pinout, STPS40L40CW application, or STPS40L40CW equivalent, key selection criteria include its TO-247 package thermal performance (R_th(j-c) = 0.8 °C/W per diode), avalanche-rated 8100 W peak power, and validated use in free-wheeling and polarity protection circuits where fast recovery and low V_F are critical.

Technical Context

This dual-diode Schottky rectifier integrates two independent anode-cathode junctions sharing a common cathode terminal (center-tap configuration), enabling synchronous rectification or dual-output DC-DC topologies. Its metal-semiconductor junction eliminates minority-carrier storage, delivering near-zero reverse recovery time and low dynamic losses at frequencies >100 kHz.

The device is rated for 150 °C maximum junction temperature and features specified avalanche capability (P_ARM = 8100 W at t_p = 1 µs), allowing robust operation under transient overvoltage conditions without external snubbers in flyback or boost converters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Supports input/output rails up to 36 V nominal with 10% margin for ripple and transients.
I_F(AV) (per diode)	20 A - Enables continuous 20 A DC output per leg in dual-rail or interleaved designs.
I_F(AV) (total)	40 A - Total device current capacity when both diodes operate simultaneously at T_c = 130°C, δ = 0.5.
V_F (max)	0.49 V at 20 A, 125°C - Reduces conduction loss to ~9.8 W per diode vs. ~16 W for standard Si diodes.
R_th(j-c)	0.8 °C/W per diode - Enables efficient heat transfer to heatsink; allows 40 W dissipation with ≤32 °C ∆T from junction to case.
I_FSM	230 A (10 ms sine) - Withstands short-term overload events like inrush or fault currents without degradation.
dV/dt	10,000 V/µs - Immune to false triggering during fast voltage transients in high-dV/dt switching nodes.

Pinout & Package

STPS40L40CW is housed in a TO-247 package with three terminals: two anodes (A1, A2) and one common cathode (K). The package features isolated mounting hole, copper tab for direct heatsink attachment, and mechanical dimensions compliant with JEDEC TO-247-3 standard (L = 20.0 mm, H = 15.6 mm, D = 2.4 mm).

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode 1	Input node for first diode leg; connects to primary-side switch node in synchronous rectifier or high-side rail in dual-output converter.
A2	Anode 2	Input node for second diode leg; enables independent control of second output or phase in interleaved topology.
K	Common Cathode	Shared output node; ties both diode outputs together for single-rail output or serves as reference for center-tapped transformer secondary.

Key Features

Feature	Design Value
Low forward voltage drop	V_F ≤ 0.49 V @ 20 A/125°C reduces conduction loss by >40% vs. comparable Si rectifiers.
Schottky barrier construction	Zero reverse recovery charge (Q_rr ≈ 0) eliminates switching loss and EMI from tail current in high-frequency SMPS.
Specified avalanche capability	8100 W peak avalanche power (t_p = 1 µs) permits reliable operation under inductive turn-off transients without clamping circuits.
Center-tap dual-diode configuration	Single-package integration of two matched diodes simplifies PCB layout and improves thermal coupling in dual-output or push-pull topologies.
TO-247 thermal performance	R_th(j-c) = 0.8 °C/W per diode supports >40 W continuous dissipation with standard heatsinking.

Applications

Server Voltage Regulator Modules (VRMs)

Telecom DC-DC Converters

Use Scenario: High-current, low-voltage (≤12 V) point-of-load regulation in data center servers using multiphase buck converters.

IC Role / Device Role / Timing Role: Synchronous rectifier replacing MOSFETs in secondary-side switching, leveraging Schottky's zero Q_rr to reduce gate drive complexity and body diode loss.

Use Value: 0.49 V V_F cuts conduction loss by 35% vs. 0.75 V Si diodes, improving full-load efficiency by 1.2–1.8% at 50 A output.

Use Scenario: 48 V to 12 V/5 V isolated DC-DC conversion in telecom base station power systems.

IC Role / Device Role / Timing Role: Center-tap secondary rectifier in forward or half-bridge topology, with A1/A2 tied to transformer ends and K as common output.

Use Value: Matched diode characteristics ensure balanced current sharing across dual outputs, minimizing cross-regulation error < ±2%.

Industrial Motor Drive Free-Wheeling

Automotive Polarity Protection

Use Scenario: Bidirectional freewheeling path in 24 V/48 V BLDC motor inverters with regenerative braking.

IC Role / Device Role / Timing Role: Low-loss return path for inductive kickback during PWM off-time; operates continuously at 10–20 kHz switching frequency.

Use Value: 10,000 V/µs dV/dt rating prevents spurious conduction during rapid bus voltage transitions, eliminating need for RC snubbers.

Use Scenario: Reverse-polarity input protection in automotive infotainment and ADAS ECUs powered from 12 V battery rail.

IC Role / Device Role / Timing Role: Series-connected Schottky in positive supply line; blocks reverse current while passing forward current with minimal dropout.

Use Value: 0.49 V forward drop limits voltage loss to < 2.5% at 20 A, preserving system headroom for cold-crank (6.5 V) operation.

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-40CPH04	Same 40 V V_RRM, 40 A I_F(AV), but TO-247 package with R_th(j-c) = 0.9 °C/W; V_F = 0.52 V @ 20 A/125°C.	Marginally higher conduction loss; identical center-tap pinout and thermal mounting interface.	Select if STPS40L40CW is unavailable and minor efficiency trade-off (<0.3% full-load) is acceptable.
ON Semiconductor MBR4045CT	45 V V_RRM, same TO-247, but V_F = 0.58 V @ 20 A/125°C and no specified avalanche rating.	Lacks avalanche capability; requires external TVS for transient protection in inductive switching.	Use only in non-inductive or low-dV/dt applications where avalanche stress is absent.

Compared with VS-40CPH04 and MBR4045CT, STPS40L40CW offers the lowest V_F and guaranteed avalanche robustness - making it preferred for high-efficiency, high-reliability SMPS where thermal margin and transient immunity are design-critical.

Availability

STPS40L40CW is available at Aetrix Electronics and suitable for server VRMs, telecom DC-DC converters, and industrial motor drive free-wheeling applications requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for STPS40L40CW 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, discrete devices, and MEMS sensors for industrial, automotive, and consumer markets.

The STPS series targets high-efficiency power conversion, with STPS40L40CW specifically engineered for low-voltage, high-current Schottky rectification in SMPS and DC-DC topologies demanding minimal V_F and robust thermal performance.

FAQ

What is the maximum junction temperature rating for STPS40L40CW?

The absolute maximum operating junction temperature is 150 °C, as specified in the Absolute Maximum Ratings table. Continuous operation above this limit risks permanent degradation of the Schottky barrier and increased leakage current. Thermal design must ensure T_j remains ≤150 °C under worst-case ambient and power dissipation conditions.

Can STPS40L40CW be used in parallel with another unit for higher current handling?

No - STPS40L40CW is not characterized or recommended for parallel operation. Its forward voltage has negative temperature coefficient, causing current imbalance and thermal runaway without active current-sharing circuitry. For >40 A applications, use a single higher-rated device or redesign with interleaved phases.

Is the TO-247 package electrically insulated?

No - the TO-247 metal tab (cathode terminal) is electrically connected to the K pin and is not insulated. Mounting requires either an insulating washer with thermal grease or a thermally conductive but electrically isolating pad to prevent short circuits when attached to grounded heatsinks.

Does STPS40L40CW require a minimum load or bias current to maintain specification compliance?

No - STPS40L40CW is a passive rectifier with no minimum load requirement. All specifications, including V_F and I_RRM, are valid from zero current up to rated values. However, leakage current increases significantly above 100 °C, so thermal management remains essential even at light loads.

STPS40L40CW Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Obsolete

Diode Configuration:: 1 Pair Common Cathode

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io) (per Diode):: 20A

Voltage - Forward (Vf) (Max) @ If:: 530 mV @ 20 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 800 µA @ 40 V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

STPS40L40CW FAQ

1.How can I place an order for STPS40L40CW through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS40L40CW 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 STPS40L40CW reliable?

The price and inventory of STPS40L40CW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40L40CW is usually 5 days.

3.What payment methods are accepted for STPS40L40CW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40L40CW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS40L40CW?

STPS40L40CW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS40L40CW 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 STPS40L40CW?

For technical support, including STPS40L40CW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40L40CW requirements.

6.How does Aetrix verify that STPS40L40CW is sourced from the original manufacturer or authorized distributors?

All STPS40L40CW 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 STPS40L40CW meets industry standards.

7.What is the process for return or replacement of STPS40L40CW?

All STPS40L40CW units undergo pre-shipment inspection (PSI). If there is an issue with STPS40L40CW, 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 STPS40L40CW part is unused and in its original packaging.

Return procedure for STPS40L40CW:

1.Submit a request within 90 days.

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

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