Taiwan Semiconductor Corporation TST20H45C

Overview

TST20H45C from Taiwan Semiconductor is a dual common-cathode trench Schottky rectifier rated for 20 A total forward current (10 A per diode), 45 V repetitive peak reverse voltage, and 210 A surge capability at 8.3 ms - deployed in high-efficiency on-board DC/DC converters and SMPS secondary-side rectification.

For engineers reviewing the TST20H45C datasheet, TST20H45C pinout, TST20H45C application, or TST20H45C equivalent, key selection criteria include its 0.48 V max forward voltage at 10 A/25°C, 150°C junction temperature rating, TO-220AB package thermal resistance (R_θJC = 2.7°C/W), and dual-diode common-cathode configuration for synchronous rectifier layouts.

Technical Context

The TST20H45C integrates two independent Schottky diodes sharing a single cathode terminal, enabling compact dual-output or interleaved rectification. Its trench-based epitaxial structure delivers stable VF across -55°C to +150°C and low leakage (<47 mA at 125°C, rated VR).

Thermal performance is defined with mounting on a 2" × 3" × 0.25" aluminum heatsink: R_θJL = 3.0°C/W and R_θJC = 2.7°C/W confirm suitability for thermally constrained industrial power stages where conduction loss and junction temperature rise must be tightly managed.

Key Specifications

Pinout & Package

Package: TO-220AB, 3-terminal molded plastic case with matte tin-plated leads, UL 94V-0 rated compound, and polarity marked on device body.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Compared with VS-20CPH045 and MBR2045CT, the TST20H45C uniquely combines dual-diode integration, lowest VF (0.48 V max), and best thermal resistance (2.7°C/W) - making it optimal for space- and thermally constrained dual-rail SMPS where efficiency and reliability are co-prioritized.

Availability

TST20H45C is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for TST20H45C 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and power discrete manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and automotive markets since 1979.

The TST20H45C belongs to TSC's high-current trench Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability secondary-side rectification in compact power converters operating up to 150°C junction temperature.

FAQ

What is the maximum continuous forward current rating per diode in the TST20H45C?

The TST20H45C is rated for 10 A continuous forward current per diode at 25°C case temperature, with derating to 0 A at 150°C per the forward current derating curve. Total device rating is 20 A, reflecting its dual-diode architecture. This rating assumes proper heatsinking per the specified R_θJC = 2.7°C/W condition.

Does the TST20H45C have a common-cathode or common-anode configuration?

The TST20H45C uses a dual common-cathode configuration: Pins 1 and 3 are independent anodes, and Pin 2 is the shared cathode terminal. This arrangement is confirmed in the marking diagram and absolute maximum ratings table, and enables efficient dual-output rectification without external node tying.

What is the typical forward voltage of the TST20H45C at 10 A and 125°C junction temperature?

At 10 A forward current and 125°C junction temperature, the TST20H45C exhibits a typical forward voltage of 0.41 V, with a maximum of 0.47 V. This low, stable VF across temperature is enabled by its patented trench Schottky process and is critical for maintaining efficiency in high-ambient environments.

Is the TST20H45C RoHS and halogen-free compliant?

Yes, the TST20H45C is fully RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. This is explicitly stated in the FEATURES section and verified in the mechanical data, confirming suitability for green electronics manufacturing and export to regulated markets.

What is the junction-to-case thermal resistance (R_θJC) specification for the TST20H45C?

The TST20H45C has a junction-to-case thermal resistance of 2.7°C/W per diode, measured under the condition of mounting on a 2" × 3" × 0.25" aluminum heatsink. This value is published in the THERMAL PERFORMANCE table and is essential for calculating safe power dissipation limits in thermal design.