STPS30150CT – 150V 30A Dual Common-Cathode Schottky Rectifier

Product Overview

The STPS30150CT is a high-voltage power Schottky rectifier manufactured by STMicroelectronics. It is a dual center-tap / common-cathode Schottky diode array designed for high-frequency switched-mode power supplies, DC/DC converters, freewheeling circuits, and output rectification applications.

This device provides a total current rating of 30A, configured as 2 × 15A, with a 150V repetitive reverse voltage rating. It is supplied in a TO-220AB through-hole package, making it suitable for power supply designs that require good thermal performance and robust board-level mounting. DigiKey describes the STPS30150CT as a Schottky diode array, 1 pair common cathode, 150V, 15A, through-hole TO-220-3, while Mouser lists it as 2 × 15A, 150V Schottky rectifier. 

Part Number Breakdown

Competitive Advantages

✔ 150V high-voltage Schottky rectifier

✔ 30A total current capability

✔ Dual common-cathode / center-tap configuration

✔ Low forward voltage drop for improved efficiency

✔ Low leakage current

✔ High junction temperature capability

✔ Avalanche capability specified

✔ TO-220AB package for good thermal performance

✔ Suitable for SMPS, DC/DC converters, industrial power, and telecom power systems

Key Features

1. Dual Common-Cathode Schottky Rectifier Structure

The STPS30150CT integrates two Schottky rectifier diodes in a common-cathode / center-tap configuration.

Benefits include:

• Suitable for secondary rectification circuits
• Useful in center-tap transformer outputs
• Reduces component count compared with two discrete diodes
• Simplifies layout in power supply output stages

2. 150V High Reverse Voltage Rating

With a 150V repetitive reverse voltage rating, the device is suitable for power circuits where higher voltage margin is required.

Benefits include:

• Suitable for medium-voltage power rails
• Useful in 24V, 36V, and 48V power architectures
• Provides design margin for switching transients
• Better fit than low-voltage Schottky diodes in higher-voltage converters

3. 30A Total Current Capability

The STPS30150CT provides a total current rating of 30A, typically configured as 2 × 15A. 

Benefits include:

• Suitable for medium-power rectification
• Can handle higher output current power supplies
• Useful for DC/DC converter output stages
• Supports robust current handling in industrial power designs

4. Low Forward Voltage Drop

As a Schottky rectifier, the STPS30150CT offers lower forward voltage drop than many conventional PN rectifier diodes.

Benefits include:

• Improved conversion efficiency
• Lower conduction losses
• Reduced heat generation
• Better performance in high-current power circuits

5. Low Leakage and Avalanche Capability

ST highlights low leakage current and specified avalanche capability for this device family. 

Benefits include:

• Improved reliability in switching environments
• Better behavior under transient stress
• Useful for rugged power supply designs
• Suitable for industrial and telecom power systems

6. TO-220AB Power Package

The STPS30150CT is supplied in a TO-220AB / TO-220-3 through-hole package. DigiKey lists it as a through-hole TO-220-3 diode array, and TME identifies the case as TO220AB. 

Benefits include:

• Good thermal dissipation capability
• Easy heatsink attachment
• Robust mechanical mounting
• Suitable for power supply and industrial PCB designs

Applications

Switched-Mode Power Supplies

Suitable for:

• AC/DC power supplies
• DC/DC converters
• SMPS secondary rectification
• Adapter and charger output stages
• Industrial power modules

The device is specifically designed for high-frequency switched-mode power supplies. 

DC/DC Converter Output Rectification

Used in:

• Buck converters
• Forward converters
• Push-pull converters
• Telecom power modules
• Industrial DC power systems

Its Schottky structure helps reduce conduction losses and improve power conversion efficiency.

Freewheeling and Flyback Circuits

Applicable to:

• Inductive load discharge paths
• Motor control circuits
• Relay driver circuits
• Solenoid driver circuits
• Switching regulator protection paths

Provides a fast, efficient current path for inductive energy.

Industrial and Telecom Power Systems

Suitable for:

• 24V power systems
• 48V telecom equipment
• Industrial control power boards
• Battery-backed power supplies
• Communication infrastructure

The 150V rating and 30A current capability make it useful in rugged power designs.

Battery Chargers and Power Distribution

Can be used in:

• Battery charger output stages
• Reverse-current protection circuits
• OR-ing diode circuits
• UPS auxiliary power stages
• Power distribution boards

Schottky rectifiers are commonly used where low voltage drop and fast switching behavior are important.