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

STMicroelectronics STPS1545R

Name: STPS1545R
Brand: STMicroelectronics
SKU: STPS1545R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS1545R

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-262-3 Long Leads, I2PAK, TO-262AA

Datasheet:: STPS1545R.pdf

Description:: DIODE SCHOTTKY 45V 15A I2PAK

Quantity:: RFQ Add To RFQ list

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Inventory:7,105

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Product details

Overview

STPS1545 from STMicroelectronics is a 45 V, 15 A average forward current power Schottky rectifier in TO-220FPAC insulated package, optimized for low-loss, high-frequency DC/DC converters and SMPS secondary-side rectification. It delivers typ. 0.5 V forward voltage at 15 A and 125 °C, supports 220 A non-repetitive surge current, and features 2000 VRMS insulation rating and avalanche capability.

For engineers reviewing the STPS1545 datasheet, STPS1545 pinout, STPS1545 application, or STPS1545 equivalent, key selection criteria include its low VF conduction loss, thermal resistance (Rth(j-c) = 4.0 °C/W), insulated TO-220FPAC package for enhanced safety in isolated topologies, and ECOPACK®2 compliance for environmental design requirements.

Technical Context

This Schottky rectifier operates as a unidirectional, majority-carrier device with negligible reverse recovery charge and extremely fast switching-enabling high-efficiency operation in 100 kHz–1 MHz DC/DC converters. Its junction-to-case thermal resistance of 4.0 °C/W (TO-220FPAC) and maximum Tj of 175 °C support continuous conduction mode in thermally constrained designs.

The device exhibits avalanche-rated repetitive peak power (430 W at 10 µs, Tj = 125 °C) and specified reverse leakage (≤40 mA at 125 °C, VR = 45 V), making it suitable for freewheeling and polarity protection where transient overvoltage resilience is required without external snubbers.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	45 V - Maximum reverse blocking voltage; defines safe operating range in buck, flyback, or LLC secondary-side applications.
IF(AV)	15 A at TC = 130 °C - Average forward current rating under heatsink-limited thermal conditions; sets continuous output capability.
VF (typ.)	0.5 V at IF = 15 A, Tj = 125 °C - Low conduction loss enables >95% efficiency in 5–12 V output rails.
Rth(j-c)	4.0 °C/W - Junction-to-case thermal resistance for TO-220FPAC; determines minimum heatsink requirement for thermal stability.
IR (max)	40 mA at Tj = 125 °C, VR = VRRM - Reverse leakage impacts standby power in always-on systems; requires careful thermal management.
IFSM	220 A (tp = 10 ms, sinusoidal) - Surge current handling supports inrush and fault conditions without catastrophic failure.
Insulation	2000 VRMS sine - Reinforced isolation between tab and leads enables use in Class I safety-isolated power supplies.

Pinout & Package

STPS1545 in TO-220FPAC package features a 3-terminal configuration with electrically insulated metal tab (cathode-connected), enabling direct mounting to grounded heatsinks without isolation hardware.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input current entry point	Connected to switching node or transformer secondary; must withstand high di/dt during turn-on.
Cathode (Lead 2)	Output current exit point	Typically tied to output capacitor ground; low-inductance layout critical for EMI control.
Insulated Tab (Cathode)	Thermal path & electrical cathode	Electrically isolated metal surface (2000 VRMS) for direct heatsink attachment; no insulating washer needed.

Key Features

Feature	Design Value
Very small conduction losses	0.5 V VF at 15 A/125 °C reduces power dissipation by ~30% vs. standard silicon rectifiers in same footprint.
Extremely fast switching	Negligible Qrr and trr < 10 ns eliminates reverse recovery spikes, simplifying EMI filter design in high-frequency SMPS.
Insulated TO-220FPAC package	2000 VRMS isolation allows direct heatsink mounting to chassis ground-reducing BOM count and assembly cost.
Avalanche capability	430 W repetitive avalanche power (10 µs, Tj = 125 °C) provides robustness against inductive kickback in freewheeling paths.
ECOPACK®2 compliance	Halogen-free, RoHS-compliant construction meets industrial and consumer environmental standards without performance trade-offs.

Applications

Server VRM Output Rectification

Industrial DC/DC Converter Secondary

Use Scenario: 12 V → 1.2 V point-of-load conversion in dual-phase buck regulators with 500 kHz switching frequency.

IC Role / Device Role / Timing Role: Synchronous rectifier replacement; conducts during low-side MOSFET on-time to minimize conduction loss.

Use Value: 0.5 V VF reduces output stage loss by 1.8 W per phase vs. Si diode, lowering thermal load on PCB and heatsink.

Use Scenario: 48 V input to 24 V isolated output in DIN-rail power supply with active clamp flyback topology.

IC Role / Device Role / Timing Role: Secondary-side freewheeling diode; clamps transformer leakage energy and recirculates current.

Use Value: Avalanche rating absorbs 430 W transient energy without derating, eliminating need for external TVS or RCD snubber.

Automotive Infotainment Power Supply

Telecom AC/DC Adapter Secondary

Use Scenario: 12 V battery-fed 5 V/3 A USB-C PD power rail in head unit with wide ambient temperature range (-40 to +105 °C).

IC Role / Device Role / Timing Role: Polarity protection diode in input stage; blocks reverse battery connection.

Use Value: 175 °C max junction temperature ensures reliability at elevated under-hood temperatures without thermal shutdown.

Use Scenario: 230 VAC input, 12 V/5 A output adapter using quasi-resonant flyback with 65 kHz switching.

IC Role / Device Role / Timing Role: Output rectifier; handles continuous 5 A load with minimal ripple and low thermal rise.

Use Value: Insulated TO-220FPAC tab enables direct mounting to grounded metal enclosure-meeting EN 62368-1 creepage/clearance requirements.

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-15BQ040-M3/45	Same VRRM (45 V), IF(AV) = 15 A, but VF = 0.52 V (typ., 125 °C); Rth(j-c) = 3.5 °C/W; non-insulated TO-220AC.	Requires insulating washer for heatsink mounting; better thermal resistance but higher conduction loss.	Select when thermal budget is tighter than isolation requirement and board-level insulation is already implemented.
ON Semiconductor MBR1545CT	Dual common-cathode configuration (15 A per diode), VF = 0.62 V (typ., 125 °C); TO-220AB package; no insulation rating.	Offers dual-diode integration for center-tapped transformer designs; lacks reinforced isolation and avalanche rating.	Prefer for cost-sensitive dual-output supplies where isolation and surge resilience are not primary concerns.

Compared with VS-15BQ040-M3/45 and MBR1545CT, STPS1545 uniquely combines 2000 VRMS insulation, 430 W avalanche capability, and 0.5 V VF in a single-diode TO-220FPAC package-making it optimal for safety-critical, high-reliability isolated DC/DC converters.

Availability

STPS1545 is available at Aetrix Electronics and suitable for server VRMs, industrial DC/DC converters, and automotive infotainment power supplies requiring stable component supply, long-term lifecycle assurance, and certified environmental compliance.

Supply support for STPS1545 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.

STPS1545 belongs to ST's high-efficiency power Schottky rectifier product line, engineered specifically for high-frequency switch-mode power supplies where low VF, fast recovery, and thermal robustness are critical.

FAQ

What is the maximum recommended heatsink temperature for continuous operation?

The TO-220FPAC package specifies IF(AV) = 15 A at TC = 130 °C. To maintain this rating, the heatsink interface temperature must not exceed 130 °C under worst-case ambient and airflow conditions. Derating is required above this point-e.g., 12 A at TC = 145 °C per Figure 2 in the datasheet.

Can STPS1545 be used in synchronous rectification circuits?

No-STPS1545 is a passive Schottky diode, not a synchronous rectifier IC or MOSFET-based controller. It functions as a self-commutated rectifier and cannot be actively gated. For synchronous designs, ST offers dedicated SR controllers like STSR3.

Is the insulated tab rated for continuous high-voltage potential?

Yes-the TO-220FPAC insulation rating of 2000 VRMS sine is validated for continuous AC voltage stress. The insulation withstands dielectric testing per IEC 60747-5-1 and is suitable for use in Class I isolated power supplies with reinforced insulation requirements.

Does STPS1545 require derating in free-air convection environments?

Yes-its Rth(j-a) is not specified in the datasheet because TO-220FPAC relies on heatsink conduction. In free-air operation, junction temperature will exceed 175 °C well below 1 A. A minimum heatsink (≥10 cm² copper area) is mandatory for any practical current level.

STPS1545R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-262-3 Long Leads, I2PAK, TO-262AA

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:: Through Hole

Supplier Device Package:: I2PAK

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

STPS1545R FAQ

1.How can I place an order for STPS1545R through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS1545R 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 STPS1545R reliable?

The price and inventory of STPS1545R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1545R is usually 5 days.

3.What payment methods are accepted for STPS1545R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1545R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS1545R?

STPS1545R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS1545R 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 STPS1545R?

For technical support, including STPS1545R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1545R requirements.

6.How does Aetrix verify that STPS1545R is sourced from the original manufacturer or authorized distributors?

All STPS1545R 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 STPS1545R meets industry standards.

7.What is the process for return or replacement of STPS1545R?

All STPS1545R units undergo pre-shipment inspection (PSI). If there is an issue with STPS1545R, 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 STPS1545R part is unused and in its original packaging.

Return procedure for STPS1545R:

1.Submit a request within 90 days.

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

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