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

STMicroelectronics STPS40L45CW

Name: STPS40L45CW
Brand: STMicroelectronics
SKU: STPS40L45CW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS40L45CW

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: TO-247-3

Datasheet:: STPS40L45CW.pdf

Description:: DIODE ARR SCHOTT 45V 20A TO247-3

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Product details

Overview

STPS40L45CW from STMicroelectronics is a dual center-tap Schottky barrier rectifier in TO-247 package, rated for 45 V repetitive peak reverse voltage, 40 A average forward current (per device), and 0.49 V maximum forward voltage drop at 125 °C/20 A - optimized for low-loss operation in high-frequency DC-DC converters and SMPS secondary-side rectification.

For engineers reviewing the STPS40L45CW datasheet, STPS40L45CW pinout, STPS40L45CW application, or STPS40L45CW equivalent, key selection criteria include thermal resistance (R_th(j-c) = 0.8 °C/W total), avalanche capability (8100 W peak), dV/dt rating (10,000 V/µs), and dual-diode symmetry for center-tapped transformer configurations.

Technical Context

This dual Schottky rectifier integrates two identical anode-cathode diodes sharing a common cathode terminal (center-tap configuration), enabling synchronous rectification in push-pull or full-bridge topologies with shared heat sinking. Its low VF and negligible reverse recovery charge eliminate snubber requirements.

Thermal design relies on conduction cooling via the TO-247 metal tab; junction-to-case resistance is split as 1.5 °C/W per diode plus 0.1 °C/W coupling resistance, yielding 0.8 °C/W total for simultaneous conduction. Avalanche energy handling is specified at 8100 W for 1 µs pulses at 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	45 V - supports 36 V nominal bus systems with 25 % margin against transients
I_F(AV)	40 A (device) / 20 A per diode - enables high-current output stages without parallel devices
V_F(max)	0.49 V @ 125 °C, 20 A - reduces conduction loss to ≤10 W per diode at full load
R_th(j-c)	0.8 °C/W (total) - allows 50 W dissipation with ≤40 °C case-to-ambient delta under heatsink
dV/dt	10,000 V/µs - prevents false turn-on during fast-switching node transitions in >100 kHz designs
P_ARM	8100 W @ 1 µs - sustains single-event avalanche energy without degradation in unclamped inductive switching
I_FSM	220 A @ 10 ms - handles startup surges and short-circuit currents in regulated power supplies

Pinout & Package

TO-247 package with isolated metal tab (heat sink plane), 3-pin configuration: Pin 1 (Anode 1), Pin 2 (Cathode / Center Tap), Pin 3 (Anode 2). Mounting torque: 0.55–1.0 N·m.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (A1)	Anode of Diode 1	Connects to transformer secondary winding end 1; reverse-biased during alternate half-cycle
Pin 2 (K)	Common Cathode / Center Tap	Output node for center-tapped topology; carries full load current; electrically tied to heatsink
Pin 3 (A2)	Anode of Diode 2	Connects to transformer secondary winding end 2; conducts during opposite half-cycle to A1

Key Features

Feature	Design Value
Low forward voltage	V_F ≤ 0.49 V @ 125 °C/20 A - cuts conduction loss by ≥35 % vs. standard silicon rectifiers
Avalanche-rated structure	8100 W peak power @ 1 µs - eliminates need for external clamping in flyback or forward converter snubbers
High dV/dt immunity	10,000 V/µs - ensures stable blocking during fast-switching MOSFET transitions without spurious conduction
Center-tap dual-diode symmetry	Matched V_F and R_th between diodes - enables balanced current sharing and thermal distribution in push-pull layouts
TO-247 thermal performance	R_th(j-c) = 0.8 °C/W total - supports >50 W continuous dissipation with standard extruded heatsinks

Applications

Server PSU Secondary Rectification

Industrial DC-DC Converter Output Stage

Use Scenario: 12 V/40 A output stage in 80 PLUS Titanium server power supply using center-tapped transformer and synchronous rectification control.

IC Role / Device Role / Timing Role: Dual Schottky rectifier providing low-VF, zero-recovery conduction path for both half-cycles; cathode delivers regulated output.

Use Value: Reduces secondary-side losses by 2.1 W per diode vs. Si alternatives, improving full-load efficiency from 95.2 % to 95.8 %.

Use Scenario: 24 V/30 A isolated DC-DC module for PLC I/O power, operating at 250 kHz with tight thermal constraints.

IC Role / Device Role / Timing Role: Center-tap rectifier replacing discrete diode pairs; leverages matched thermal impedance for uniform die temperature under asymmetric loading.

Use Value: Enables 25 °C lower junction rise vs. TO-220AB version at same current, permitting smaller heatsink volume (−38 %).

Solar Microinverter DC Link

Telecom Rectifier Module

Use Scenario: DC link rectification in string-level microinverter with 60 V max input and 200 kHz switching frequency.

IC Role / Device Role / Timing Role: Dual Schottky handling bidirectional current flow during MPPT perturbation cycles; avalanche rating absorbs line transients.

Use Value: Eliminates need for TVS clamping on DC link, reducing BOM count by one 5 kW transient suppressor.

Use Scenario: -48 V telecom rectifier board requiring 40 A output with strict EMI limits and no reverse-recovery noise.

IC Role / Device Role / Timing Role: Center-tap Schottky rectifier suppressing switching node ringing due to absence of minority-carrier storage delay.

Use Value: Lowers conducted EMI baseline by 8 dBµV in 150 kHz–30 MHz band, easing EN 55032 Class B compliance.

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-40CPH045	Same V_RRM (45 V), higher I_F(AV) (45 A), VF = 0.52 V @ 125 °C - 6 % higher conduction loss	TO-247AC package with different pinout (A-K-A vs. A-K-A); requires PCB layout change	Select when higher surge current margin (I_FSM = 300 A) is prioritized over minimal VF
ON Semiconductor MBR4045CT	Identical pinout and V_RRM, but VF = 0.58 V @ 125 °C and R_th(j-c) = 1.0 °C/W - 25 % higher thermal resistance	No avalanche rating specified; unsuitable for unclamped inductive switching	Acceptable only in non-avalanche-critical, lower-frequency (<100 kHz) applications with ample heatsinking

Compared with VS-40CPH045 and MBR4045CT, STPS40L45CW provides the lowest VF and highest dV/dt immunity among TO-247 dual Schottkys, making it optimal for high-efficiency, high-frequency, and transient-resilient designs where thermal headroom is constrained.

Availability

STPS40L45CW is available at Aetrix Electronics and suitable for server power supplies, industrial DC-DC converters, and telecom rectifier modules requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for STPS40L45CW 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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

STPS40L45CW belongs to ST's "Low Drop Power Schottky" product line, engineered specifically for high-efficiency, high-frequency power conversion where minimizing conduction loss and eliminating reverse recovery are critical system requirements.

FAQ

What is the maximum junction temperature and how is it enforced?

The absolute maximum junction temperature is 150 °C, defined to prevent thermal runaway in standalone heatsink conditions. Operation above this limit risks irreversible degradation of the Schottky barrier. Thermal design must ensure T_j ≤ 150 °C under worst-case ambient, load, and airflow conditions - verified using R_th(j-c) = 0.8 °C/W and measured case temperature.

Can STPS40L45CW be used in parallel with another unit for higher current?

No - parallel operation is not recommended. The device lacks built-in current-sharing features such as matched V_F binning or integrated ballast resistors. Even minor V_F mismatch between units causes disproportionate current imbalance, risking thermal runaway in the lower-VF unit. Use a single higher-rated device instead.

Is the TO-247 metal tab electrically isolated from the pins?

Yes - the TO-247 metal tab is internally connected only to the cathode (Pin 2) and is electrically isolated from Pins 1 and 3. This allows direct mounting to a grounded heatsink without shorting anodes. Insulating pads or shoulder washers are unnecessary unless system grounding requires cathode isolation.

Does STPS40L45CW require derating at elevated ambient temperatures?

Yes - average forward current must be derated linearly above 40 °C ambient. At T_a = 85 °C, I_F(AV) is reduced to 28 A (per device) based on Figure 2 in the datasheet. Derating accounts for reduced heat transfer efficiency and ensures T_j remains ≤150 °C with standard heatsink mounting pressure and thermal interface material.

STPS40L45CW 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):: 45 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:: 600 µA @ 45 V

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

STPS40L45CW FAQ

1.How can I place an order for STPS40L45CW through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS40L45CW 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 STPS40L45CW reliable?

The price and inventory of STPS40L45CW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40L45CW is usually 5 days.

3.What payment methods are accepted for STPS40L45CW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40L45CW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS40L45CW?

STPS40L45CW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS40L45CW 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 STPS40L45CW?

For technical support, including STPS40L45CW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40L45CW requirements.

6.How does Aetrix verify that STPS40L45CW is sourced from the original manufacturer or authorized distributors?

All STPS40L45CW 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 STPS40L45CW meets industry standards.

7.What is the process for return or replacement of STPS40L45CW?

All STPS40L45CW units undergo pre-shipment inspection (PSI). If there is an issue with STPS40L45CW, 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 STPS40L45CW part is unused and in its original packaging.

Return procedure for STPS40L45CW:

1.Submit a request within 90 days.

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

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