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

STMicroelectronics STPS40L45CG

Name: STPS40L45CG
Brand: STMicroelectronics
SKU: STPS40L45CG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS40L45CG

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: STPS40L45CG.pdf

Description:: DIODE ARRAY SCHOTT 45V 20A D2PAK

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Product details

Overview

STPS40L45CG from STMicroelectronics is a dual center-tap Schottky barrier rectifier in D2PAK package, rated for 45 V repetitive peak reverse voltage, 2 × 20 A average forward current per diode, and maximum 0.49 V forward voltage drop at 20 A and 125 °C - optimized for low-loss, high-frequency DC-DC converters and SMPS secondary-side rectification.

For engineers reviewing the STPS40L45CG datasheet, STPS40L45CG pinout, STPS40L45CG application, or STPS40L45CG equivalent, this device delivers verified avalanche capability (8100 W peak), low thermal resistance (1.5 °C/W junction-to-case per diode), and dual-diode symmetry critical for center-tapped transformer topologies in telecom power supplies and industrial POL modules.

Technical Context

This dual-center-tap Schottky rectifier integrates two independent anode-cathode paths sharing a common cathode terminal (K), enabling synchronous half-wave rectification in flyback and forward converters. Its low dV/dt rating (10,000 V/µs) and specified avalanche energy absorption support robust operation under transient overvoltage conditions without external snubbers.

The device leverages planar Schottky technology with metal-silicon barrier optimization to achieve sub-0.5 V VF at 125 °C while maintaining IR ≤ 280 mA at VR = 45 V and Tj = 125 °C - directly enabling higher efficiency in 5–12 V output rails where conduction loss dominates.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	45 V - supports input/output isolation up to 45 V reverse bias without breakdown in DC-DC secondaries.
IF(AV) per diode	20 A at Tc = 130 °C - enables 40 A total dual-diode continuous conduction with shared heatsink mounting.
VF(max)	0.49 V at IF = 20 A, Tj = 125 °C - reduces conduction loss to ~9.8 W per diode vs. silicon diodes (>1.1 V).
Rth(j-c) per diode	1.5 °C/W - allows 30 W dissipation per diode before reaching 150 °C junction limit on standard PCB copper.
PARM(peak)	8100 W at tp = 1 µs - provides validated avalanche ruggedness for inductive switching transients in hard-switched topologies.
dV/dt	10,000 V/µs - ensures stable blocking during fast voltage transitions without spurious turn-on.

Pinout & Package

STPS40L45CG uses a 3-terminal D2PAK (TO-263) surface-mount package with exposed thermal pad. Pin configuration: Terminal 1 = Anode 1 (A1), Terminal 2 = Cathode (K), Terminal 3 = Anode 2 (A2). The common cathode enables center-tap transformer connection with symmetrical current sharing.

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode of Diode 1	Connects to one end of center-tapped secondary winding; carries full load current during its half-cycle.
K	Common Cathode	Shared output node for both diodes; must be routed to low-impedance ground/power plane for thermal and EMI control.
A2	Anode of Diode 2	Connects to opposite end of center-tapped secondary; conducts during alternate half-cycle with matched VF and thermal behavior.

Key Features

Feature	Design Value
Low VF at high temperature	0.42 V typ. at 20 A / 125 °C - maintains efficiency in thermally constrained enclosures without derating.
Dual-diode symmetry	Matched VF and Rth(j-c) between A1–K and A2–K paths - ensures balanced current sharing in center-tap topology.
Avalanche-rated operation	8100 W peak avalanche power at 1 µs - eliminates need for external clamping in flyback snubberless designs.
High dV/dt immunity	10,000 V/µs - prevents false triggering during fast-switching MOSFET gate drive coupling or layout parasitics.

Applications

Telecom DC-DC Converters

Industrial POL Modules

Use Scenario: 48 V input to 5 V/20 A isolated DC-DC converter using center-tapped transformer and synchronous rectification.

IC Role / Device Role / Timing Role: Dual Schottky rectifier providing low-loss secondary-side conduction with alternating half-cycle conduction per diode.

Use Value: Reduces secondary conduction loss by 42% versus Si diodes, lowering thermal load on 2-layer FR4 PCB with 40 cm² copper area.

Use Scenario: Point-of-load supply for FPGA I/O banks requiring tight regulation and fast transient response.

IC Role / Device Role / Timing Role: Center-tap rectifier delivering clean, low-noise 1.2 V output with minimal voltage droop during 10 A/µs load steps.

Use Value: Enables >92% efficiency at full load due to 0.49 V max VF and 1.5 °C/W Rth(j-c), reducing heatsink volume by 65%.

Server VRMs

Test Equipment Power Supplies

Use Scenario: High-density 12 V input to 3.3 V/30 A VRM for CPU core logic with multi-phase interleaving.

IC Role / Device Role / Timing Role: Secondary-side rectifier in each phase's center-tapped inductor design, operating at 300 kHz switching frequency.

Use Value: Supports 300 kHz operation with negligible reverse recovery loss, eliminating need for active clamp circuits.

Use Scenario: Programmable bench power supply with adjustable 0–30 V, 0–10 A output using forward converter topology.

IC Role / Device Role / Timing Role: Free-wheeling and polarity protection rectifier handling bidirectional current during dynamic load changes.

Use Value: Withstands 220 A non-repetitive surge and 3 A non-repetitive reverse current, ensuring reliability during fault testing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual center-tap Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-40CPH045	Same VRRM (45 V), but TO-247 package; Rth(j-c) = 1.0 °C/W (lower), VF = 0.52 V max at 20 A/125 °C (higher)	Requires bolt-down heatsink; better thermal performance but larger footprint and higher conduction loss	Select when board space permits and junction temperature margin is critical over VF efficiency
ON Semiconductor MBR4045CT	D2PAK package, same pinout; VRRM = 45 V, IF(AV) = 20 A per diode, but VF = 0.65 V max at 20 A/125 °C	Higher conduction loss increases thermal stress on PCB copper; no specified avalanche rating	Select only if cost sensitivity outweighs efficiency and ruggedness requirements in non-critical applications

Compared with VS-40CPH045 and MBR4045CT, STPS40L45CG uniquely balances low VF (0.49 V), validated avalanche capability (8100 W), and D2PAK surface-mount compatibility - making it optimal for space-constrained, high-efficiency telecom and server power supplies where thermal and transient robustness are co-prioritized.

Availability

STPS40L45CG is available at Aetrix Electronics and suitable for telecom DC-DC converters, industrial point-of-load modules, and server VRMs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant D2PAK packaging.

Supply support for STPS40L45CG 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

STPS40L45CG belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for high-frequency switched-mode power supplies where low forward voltage and avalanche ruggedness are mandatory for reliable secondary-side rectification.

FAQ

What is the thermal resistance junction-to-case for STPS40L45CG?

The junction-to-case thermal resistance (Rth(j-c)) is 1.5 °C/W per diode, measured from each die to the D2PAK package backside thermal pad. This value assumes proper soldering to a minimum 40 mm² copper pour with 35 µm thickness on FR4 PCB, and is confirmed in Table 3 of the official ST datasheet (DocID6857 Rev 5).

Does STPS40L45CG support center-tapped transformer configurations?

Yes - STPS40L45CG is explicitly designed as a dual center-tap Schottky rectifier with terminals A1, K (common cathode), and A2. Its internal structure connects two independent Schottky junctions to a shared cathode, enabling direct interface with center-tapped secondary windings in forward and push-pull topologies.

Is avalanche capability tested and specified for STPS40L45CG?

Yes - ST specifies repetitive peak avalanche power (PARM) as 8100 W at tp = 1 µs and Tj = 25 °C (Table 2), with derating curves provided in Figure 3 and Figure 4. This rating is production-tested and guaranteed per ST's quality standards, enabling use in snubberless flyback designs.

Can STPS40L45CG replace TO-220AB variants like STPS40L45CT in the same PCB layout?

No - STPS40L45CG uses D2PAK (TO-263) package with gull-wing leads and thermal pad, while STPS40L45CT uses through-hole TO-220AB. Footprints, soldering methods, and thermal interface requirements differ fundamentally; mechanical adaptation requires redesign of land pattern, stencil, and assembly process.

STPS40L45CG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: Surface Mount

Supplier Device Package:: D2PAK

STPS40L45CG FAQ

1.How can I place an order for STPS40L45CG through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS40L45CG 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 STPS40L45CG reliable?

The price and inventory of STPS40L45CG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40L45CG is usually 5 days.

3.What payment methods are accepted for STPS40L45CG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40L45CG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS40L45CG?

STPS40L45CG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS40L45CG 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 STPS40L45CG?

For technical support, including STPS40L45CG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40L45CG requirements.

6.How does Aetrix verify that STPS40L45CG is sourced from the original manufacturer or authorized distributors?

All STPS40L45CG 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 STPS40L45CG meets industry standards.

7.What is the process for return or replacement of STPS40L45CG?

All STPS40L45CG units undergo pre-shipment inspection (PSI). If there is an issue with STPS40L45CG, 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 STPS40L45CG part is unused and in its original packaging.

Return procedure for STPS40L45CG:

1.Submit a request within 90 days.

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

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