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

STMicroelectronics STPS40L15CW

Name: STPS40L15CW
Brand: STMicroelectronics
SKU: STPS40L15CW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS40L15CW

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: TO-247-3

Datasheet:: STPS40L15CW.pdf

Description:: DIODE ARR SCHOTT 15V 20A TO247-3

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Product details

Overview

STPS40L15CW from STMicroelectronics is a dual center-tap Schottky rectifier in TO-247 package, designed specifically for OR-ing diode applications in fault-tolerant 3 V, 5 V, and 12 V power supply rails. It delivers 2×20 A average forward current per diode, 15 V repetitive peak reverse voltage, and a maximum forward voltage drop of 0.33 V at 125 °C and 40 A, enabling low conduction loss in redundant power systems.

For engineers reviewing the STPS40L15CW datasheet, STPS40L15CW pinout, STPS40L15CW application, or STPS40L15CW equivalent, key selection criteria include its avalanche-rated 13.14 kW peak power capability, 1.6 °C/W junction-to-case thermal resistance per diode, and validated use in hot-swap and N+1 power redundancy architectures.

Technical Context

This dual-center-tap Schottky diode integrates two independent anode-cathode paths sharing a common cathode terminal (K), configured for parallel OR-ing of two input power sources into a single output rail. Its low VF (0.28–0.33 V typ. @ 125 °C) minimizes forward conduction loss, while specified avalanche capability (13140 W @ 1 µs) supports transient overvoltage robustness without external clamping.

The device operates up to 125 °C junction temperature with 0.85 °C/W total junction-to-case thermal resistance (dual-diode mode), and exhibits dV/dt immunity of 10,000 V/µs - critical for fast-switching OR-ing control in high-reliability DC distribution systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	15 V - Supports OR-ing of standard 3 V, 5 V, and 12 V rails with margin against ripple and overshoot
I_F(AV)	40 A total (2×20 A per diode) - Enables high-current redundant power path merging without derating
V_F(max)	0.33 V @ T_j = 125 °C, I_F = 40 A - Reduces conduction loss to ≤1.3 W per diode at full load
R_th(j-c)	1.6 °C/W per diode - Allows direct heatsink mounting with predictable thermal rise under continuous operation
P_ARM	13140 W @ t_p = 1 µs - Provides controlled avalanche energy absorption during bus fault transients
dV/dt	10000 V/µs - Ensures stable blocking behavior during fast-rising line disturbances
I_FSM	310 A non-repetitive surge - Withstands inrush currents during hot-plug events in modular PSUs

Pinout & Package

STPS40L15CW is housed in a TO-247 package with three terminals: two anodes (A1, A2) and one shared cathode (K). The case is electrically isolated and thermally conductive, intended for mechanical mounting to a heatsink using 0.9–1.2 N·m torque on the M3.5 screw.

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode 1	Input terminal for first power source (e.g., PSU #1); reverse-biased when second source dominates
A2	Anode 2	Input terminal for second power source (e.g., PSU #2); reverse-biased when first source dominates
K	Common Cathode	Single output node feeding load; forward conduction occurs only from active input to this rail

Key Features

Feature	Design Value
Low forward voltage drop	0.28 V typ. @ 125 °C, 19 A - Cuts conduction loss by >40% vs. standard Schottkys, reducing heatsink size
Dual center-tap configuration	Two independent anodes + shared cathode - Enables seamless OR-ing without external diode pairing or layout asymmetry
Specified avalanche capability	13140 W peak @ 1 µs - Eliminates need for external TVS in many 12 V OR-ing designs with defined fault energy
High dV/dt immunity	10,000 V/µs - Prevents false turn-on during fast transients in distributed power architectures
TO-247 thermal performance	0.85 °C/W total R_th(j-c) - Supports >35 W dissipation with standard 10 K/W heatsink at 75 °C ambient

Applications

Telecom Power Shelf

Industrial PLC Backplane

Use Scenario: Dual 12 V DC inputs feeding a shared backplane in carrier-grade telecom shelf with N+1 redundancy.

IC Role / Device Role / Timing Role: OR-ing diode ensuring automatic failover between primary and backup power modules without interruption.

Use Value: 0.33 V max V_F limits voltage drop to <1.5% at 40 A, preserving downstream regulator headroom and thermal margin.

Use Scenario: Hot-swappable I/O module with independent 5 V auxiliary rail powered from main chassis supply or local DC-DC.

IC Role / Device Role / Timing Role: Fault-isolating OR-ing element preventing backfeed and enabling live insertion/removal.

Use Value: Avalanche rating absorbs 12 V bus collapse energy (≤100 µJ), avoiding latch-up or catastrophic failure during module swap.

Server PSU Redundancy

Medical Diagnostic Rack

Use Scenario: Parallel connection of two 12 V ATX-style PSUs to a single motherboard VRM input rail.

IC Role / Device Role / Timing Role: Passive OR-ing switch maintaining uninterrupted 12 V delivery during PSU replacement or failure.

Use Value: 310 A I_FSM withstands cold-start inrush of secondary PSU without degradation or bond-wire fusing.

Use Scenario: Dual 3.3 V/5 V power domains powering safety-critical imaging subsystems with zero-failure tolerance.

IC Role / Device Role / Timing Role: Isolation diode enforcing unidirectional power flow between redundant supplies and load.

Use Value: 125 °C max T_j and 1.6 °C/W R_th(j-c) enable stable operation in sealed enclosures with no forced airflow.

Equivalent & Alternatives

The following parts are listed as comparable options for similar OR-ing diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STPS40L15CT	Same die, TO-220AB package; R_th(j-c) = 1.7 °C/W per diode (vs. 1.6 °C/W); lower surge rating (280 A I_FSM)	Better suited for space-constrained PCB-mount designs with moderate thermal budget	Select when board-level heatsinking suffices and TO-247 mechanical footprint is unavailable
Vishay VS-40CPH015	15 V V_RRM, 40 A I_F(AV), but VF = 0.45 V max @ 125 °C - 36% higher conduction loss	Lacks specified avalanche rating; requires external TVS for transient protection	Choose only if STPS40L15CW is unavailable and system-level testing confirms adequate transient margin

Compared with STPS40L15CT, the STPS40L15CW offers superior thermal performance and surge robustness for chassis-mounted, high-power OR-ing; versus VS-40CPH015, it delivers lower loss and integrated avalanche protection - critical for unattended infrastructure equipment.

Availability

STPS40L15CW is available at Aetrix Electronics and suitable for telecom power shelves, industrial PLC backplanes, and server PSU redundancy requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for STPS40L15CW 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, analog ICs, and sensors for industrial, automotive, and consumer markets.

The STPS40L15CW belongs to ST's high-reliability Schottky rectifier product line, engineered specifically for fault-tolerant DC power OR-ing in telecom, computing, and medical infrastructure where zero-downtime power delivery is mandatory.

FAQ

What is the cathode terminal configuration for STPS40L15CW?

The STPS40L15CW features a single shared cathode (K) terminal and two separate anode terminals (A1 and A2), forming a dual center-tap structure. This allows independent connection of two input power sources to A1 and A2, with combined output delivered through K - essential for passive OR-ing without cross-conduction.

Can STPS40L15CW be used in 24 V systems?

No - STPS40L15CW has a 15 V V_RRM rating and is not rated for continuous operation above 15 V reverse bias. Using it in 24 V systems risks premature breakdown and catastrophic failure. For 24 V OR-ing, ST recommends the STPS40H100CW (100 V V_RRM) or equivalent.

Is heatsinking required for STPS40L15CW at 40 A total current?

Yes - at 40 A total (20 A per diode), conduction loss exceeds 13 W. With R_th(j-c) = 0.85 °C/W and max T_j = 125 °C, a heatsink with ≤10 °C/W R_th(c-a) is required to maintain safe junction temperature at 75 °C ambient. Board-only thermal path is insufficient.

Does STPS40L15CW support bidirectional current flow?

No - it is a unidirectional Schottky rectifier. Current flows only from A1→K or A2→K. Reverse current (K→A1 or K→A2) is blocked up to 15 V, and sustained reverse conduction will cause thermal runaway. It is not a bidirectional switch or ideal diode controller.

STPS40L15CW Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Active

Diode Configuration:: 1 Pair Common Cathode

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 15 V

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

Voltage - Forward (Vf) (Max) @ If:: 410 mV @ 19 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 6 mA @ 15 V

Operating Temperature - Junction:: 125°C (Max)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

STPS40L15CW FAQ

1.How can I place an order for STPS40L15CW through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS40L15CW 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 STPS40L15CW reliable?

The price and inventory of STPS40L15CW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40L15CW is usually 5 days.

3.What payment methods are accepted for STPS40L15CW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40L15CW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS40L15CW?

STPS40L15CW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS40L15CW 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 STPS40L15CW?

For technical support, including STPS40L15CW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40L15CW requirements.

6.How does Aetrix verify that STPS40L15CW is sourced from the original manufacturer or authorized distributors?

All STPS40L15CW 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 STPS40L15CW meets industry standards.

7.What is the process for return or replacement of STPS40L15CW?

All STPS40L15CW units undergo pre-shipment inspection (PSI). If there is an issue with STPS40L15CW, 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 STPS40L15CW part is unused and in its original packaging.

Return procedure for STPS40L15CW:

1.Submit a request within 90 days.

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

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