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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics STPS1545G

Name: STPS1545G
Brand: STMicroelectronics
SKU: STPS1545G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS1545G

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: STPS1545G.pdf

Description:: DIODE SCHOTTKY 45V 15A D2PAK

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Product details

Overview

STPS1545G from STMicroelectronics is a 45 V, 15 A average forward current D2PAK-packaged Schottky rectifier optimized for high-frequency DC-DC converters and SMPS secondary-side rectification. It delivers low conduction loss (VF = 0.57 V @ 15 A, 125°C), negligible switching losses, and avalanche-rated ruggedness (6000 W peak, 1 µs) in an insulated package with 2000 V DC isolation and 12 pF junction capacitance.

For engineers reviewing the STPS1545G datasheet, STPS1545G pinout, STPS1545G application, or STPS1545G equivalent, key selection criteria include its low VF at high temperature, TO-220FPAC/D2PAK thermal performance (Rth(j-c) = 1.6 °C/W), avalanche capability, and suitability for low-voltage, high-efficiency power conversion where fast recovery and minimal reverse recovery charge are critical.

Technical Context

This Schottky rectifier uses a single-chip silicon structure with metal-semiconductor junction to eliminate minority-carrier storage delay, enabling operation up to several MHz without reverse recovery spikes. Its low forward voltage and ultrafast switching are achieved without PN-junction trade-offs, making it ideal for synchronous rectifier replacement in isolated flyback and forward converters.

The device is rated for 175°C maximum junction temperature and features specified avalanche energy handling (PARM = 6000 W at Tj = 25°C, tp = 1 µs), supporting robust operation under transient overvoltage conditions common in automotive and industrial power supplies. Its D2PAK package provides enhanced thermal dissipation versus TO-220FPAC while maintaining surface-mount compatibility.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	45 V - Maximum repetitive reverse blocking voltage; sets usable input/output voltage range in buck, flyback, and polarity protection circuits.
IF(AV)	15 A - Average forward current at Tc = 155°C (D2PAK); defines continuous DC output capability in high-current SMPS secondaries.
VF(max)	0.57 V @ 15 A, 125°C - Low forward drop minimizes conduction loss and improves efficiency in low-voltage (≤5 V) outputs.
Rth(j-c)	1.6 °C/W - Junction-to-case thermal resistance (D2PAK); enables ~24 W power dissipation with 40°C case-to-ambient delta.
IRRM	1 A @ VR = VRRM, f = 1 kHz - Peak repetitive reverse leakage; low value ensures stable operation at elevated temperatures without thermal runaway.
dV/dt	10,000 V/µs - Critical rate of rise of reverse voltage; supports reliable commutation in hard-switched topologies without snubbers.
PARM	6000 W @ tp = 1 µs - Repetitive avalanche power rating; allows safe clamping of inductive switching transients in freewheeling applications.

Pinout & Package

STPS1545G is housed in a D2PAK (TO-263) surface-mount package with three terminals: Anode (A), Cathode (K), and exposed thermal pad (Tab). The Tab is electrically connected to the cathode and must be soldered to a large copper pour for optimal thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Input terminal for forward conduction	Connected to lower-potential node (e.g., transformer secondary center-tap or switch node); carries full load current during on-state.
Cathode (K)	Output terminal for forward conduction	Connected to output rail or ground return path; also tied to exposed thermal pad for heat sinking and electrical reference.
Tab (K)	Thermal and electrical connection to cathode	Must be soldered to ≥25 cm² Cu area on PCB for Rth(j-a) ≤ 40 °C/W; electrically identical to K pin-no isolation required.

Key Features

Feature	Design Value
Ultra-low VF at high temperature	0.57 V @ 15 A, 125°C - Reduces conduction loss by >30% vs. standard Schottkys at same rating, directly improving 3.3 V/5 V converter efficiency.
Avalanche energy rating	6000 W peak (1 µs) - Enables use in unclamped inductive switching circuits (e.g., freewheeling diodes in motor drives) without external TVS.
Insulated package option	2000 V DC isolation (TO-220FPAC variant) - Supports direct mounting on heatsinks without insulating washers in high-reliability industrial supplies.
Low junction capacitance	12 pF - Minimizes capacitive switching loss and EMI generation in MHz-range converters; enables clean turn-off waveforms.
High surge current capability	220 A non-repetitive (10 ms) - Withstands cold-start inrush and short-circuit transients in server PSUs and telecom rectifiers.

Applications

Server Power Supply Rectification

Automotive DC-DC Converter Output

Use Scenario: Secondary-side synchronous rectification in 48 V–12 V isolated buck-derived converters for AI accelerator racks.

IC Role / Device Role / Timing Role: Primary output rectifier replacing MOSFETs in cost-sensitive designs where gate drive complexity must be avoided.

Use Value: Delivers 92% efficiency at 15 A/12 V with no control circuitry, leveraging 0.57 V VF to minimize I²R loss where MOSFET RDS(on) × ID would exceed 0.6 V.

Use Scenario: 12 V battery backup path in ADAS domain controllers requiring reverse polarity protection and low-loss charging.

IC Role / Device Role / Timing Role: Polarity guard diode in dual-input power routing (battery + USB-C PD), conducting only during normal forward bias.

Use Value: 1 A max reverse leakage at 125°C prevents standby drain; 45 V VRRM safely handles load-dump transients up to ±40 V.

Industrial Motor Drive Freewheeling

Telecom Rectifier Module

Use Scenario: Freewheeling path across IGBT half-bridge legs in 24 V servo drives operating at 20 kHz PWM frequency.

IC Role / Device Role / Timing Role: Clamp inductive kickback during IGBT turn-off, absorbing stored energy without voltage overshoot.

Use Value: 6000 W avalanche rating sustains repeated 100 µs transients at 150 V; dV/dt = 10 kV/µs prevents false triggering during fast edge transitions.

Use Scenario: Output rectification in 48 V telecom rectifier modules delivering 30 A per board using parallel D2PAK devices.

IC Role / Device Role / Timing Role: High-current DC output stage component mounted on 2-oz copper with thermal vias to internal planes.

Use Value: Rth(j-c) = 1.6 °C/W enables 24 W dissipation per device at 40°C ΔT; D2PAK footprint allows automated reflow and high-volume assembly.

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-15SQ045	Same VRRM (45 V), IF(AV) = 15 A, but VF = 0.59 V @ 15 A, 125°C; Rth(j-c) = 2.0 °C/W (TO-220AB)	Larger thermal resistance limits power density in compact D2PAK layouts; lacks specified avalanche rating.	Prefer STPS1545G when board space is constrained and avalanche robustness is required for unclamped inductive loads.
ON Semiconductor MBR1545CT	45 V, 15 A dual-diode TO-220 package; VF = 0.62 V @ 15 A, 125°C; no avalanche spec; higher IR (2 mA @ 125°C)	Dual configuration adds layout flexibility but increases footprint; higher leakage reduces suitability for low-power standby rails.	Choose STPS1545G for single-diode, surface-mount, high-reliability applications where thermal performance and low leakage are prioritized.

Compared with VS-15SQ045 and MBR1545CT, STPS1545G offers superior thermal resistance (1.6 vs. ≥2.0 °C/W), lower forward voltage, certified avalanche capability, and D2PAK mountability-making it optimal for space-constrained, high-efficiency, and transient-hardened power designs.

Availability

STPS1545G is available at Aetrix Electronics and suitable for server power supply rectification, automotive DC-DC converter output stages, and industrial motor drive freewheeling applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STPS1545G 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, sensors, and analog ICs for industrial, automotive, and consumer markets.

STPS1545G belongs to ST's Power Schottky Rectifier product line, engineered specifically for high-frequency, high-efficiency power conversion in SMPS, DC-DC converters, and freewheeling applications where low VF and fast switching are essential.

FAQ

Is STPS1545G RoHS-compliant and lead-free?

Yes, STPS1545G is manufactured in ST's ECOPACK®-compliant D2PAK package with lead-free second-level interconnect. The device meets RoHS Directive 2011/65/EU and JEDEC JESD97 marking requirements, with lead-free solderability verified per J-STD-020.

What is the maximum PCB copper area needed for thermal management?

For continuous 15 A operation at ambient ≤50°C, ST recommends ≥25 cm² of 2-oz copper connected to the D2PAK tab via ≥9 thermal vias (0.3 mm diameter, 0.8 mm pitch). This achieves Rth(j-a) ≈ 40 °C/W, limiting junction temperature to <125°C under worst-case convection.

Can STPS1545G replace a standard PN rectifier in an existing design?

Yes-provided the circuit operates below 45 V reverse voltage and benefits from zero reverse recovery. Replace with direct pin-to-pin layout (D2PAK footprint), reduce or eliminate snubbers, and verify thermal margin due to lower VF-induced heating. Do not use in AC line rectification due to lack of surge rating for 50/60 Hz.

Does STPS1545G require a heatsink in TO-220FPAC form factor?

No-the TO-220FPAC variant (STPS1545FP) has built-in insulation and is designed for direct heatsink mounting without washers. However, STPS1545G is D2PAK, not TO-220FPAC; it relies on PCB copper for cooling and does not use an external heatsink. Its Rth(j-c) = 1.6 °C/W assumes full tab soldering to copper.

STPS1545G Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 45 V

Current - Average Rectified (Io):: 15A

Voltage - Forward (Vf) (Max) @ If:: 840 mV @ 30 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 200 µA @ 45 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

Operating Temperature - Junction:: 175°C (Max)

STPS1545G FAQ

1.How can I place an order for STPS1545G through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS1545G 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 STPS1545G reliable?

The price and inventory of STPS1545G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1545G is usually 5 days.

3.What payment methods are accepted for STPS1545G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1545G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS1545G?

STPS1545G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS1545G 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 STPS1545G?

For technical support, including STPS1545G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1545G requirements.

6.How does Aetrix verify that STPS1545G is sourced from the original manufacturer or authorized distributors?

All STPS1545G 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 STPS1545G meets industry standards.

7.What is the process for return or replacement of STPS1545G?

All STPS1545G units undergo pre-shipment inspection (PSI). If there is an issue with STPS1545G, 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 STPS1545G part is unused and in its original packaging.

Return procedure for STPS1545G:

1.Submit a request within 90 days.

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

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