Taiwan Semiconductor Corporation TSF20H45C

Overview

TSF20H45C 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 DC/DC converters and SMPS secondary-side rectification.

For engineers reviewing the TSF20H45C datasheet, TSF20H45C pinout, TSF20H45C application, or TSF20H45C equivalent, key selection criteria include thermal resistance (R_θJC = 3.4 °C/W), low VF (0.48 V max @ 10 A, 25°C), high-temperature IR stability (47 mA @ 125°C), dual-die ITO-220AB package mounting, and RoHS/halogen-free compliance.

Technical Context

The TSF20H45C integrates two independent Schottky die in a single ITO-220AB thermally optimized package with common cathode configuration, enabling synchronous or interleaved rectification topologies without external parallel wiring. Its trench-based architecture delivers lower VF and superior TJ-dependent leakage control versus planar Schottky diodes.

Designed for surface-mount-compatible through-hole assembly, it supports high-reliability thermal management via direct heatsink mounting (2" × 3" × 0.25" Al plate), achieving R_θJC = 3.4 °C/W and R_θJL = 3.9 °C/W - critical for compact, convection-cooled power supplies operating up to 150°C junction temperature.

Key Specifications

Pinout & Package

Package: ITO-220AB - insulated TO-220 variant with internal isolation barrier, matte tin-plated leads (J-STD-002 compliant), UL 94V-0 molding compound, and 0.56 N·m maximum mounting torque. 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-20CPH04-M3 and MBR2045CT, the TSF20H45C delivers lower VF, tighter IR control at high temperature, and certified halogen-free construction - making it the optimal choice for thermally constrained, regulated, and export-targeted power supplies.

Availability

TSF20H45C is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and LED lighting applications requiring stable component supply, long-lifecycle support, and consistent thermal performance across production batches.

Supply support for TSF20H45C 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 semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability rectifiers, TVS devices, and MOSFETs for industrial and computing markets.

The TSF series targets high-efficiency, thermally demanding power conversion - engineered specifically for SMPS secondary-side rectification where low VF, high I_FSM, and robust thermal metrics outweigh cost-per-watt trade-offs.

FAQ

What is the maximum junction temperature rating for the TSF20H45C?

The TSF20H45C has a maximum junction temperature (T_J) rating of +150°C, with operational capability down to –55°C. This wide range supports deployment in automotive under-hood modules, industrial motor drives, and outdoor LED lighting where ambient temperatures exceed 85°C. The device's thermal design - including R_θJC = 3.4 °C/W - enables reliable operation at T_J = 150°C when mounted on an appropriate heatsink.

Does the TSF20H45C support RoHS and halogen-free compliance?

Yes, the TSF20H45C is fully RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and the matte tin-plated leads meet J-STD-002 solderability standards. These certifications are verified in Taiwan Semiconductor's official product change notices and material declarations for TSF20H45C.

How is the pinout configured for the dual diodes in TSF20H45C?

The TSF20H45C uses a three-terminal ITO-220AB package with Anode 1 (A1), Anode 2 (A2), and Common Cathode (K). A1 and A2 are electrically isolated anodes; K serves as the shared output node and primary thermal path. This configuration avoids cross-conduction risks and simplifies PCB layout for dual-phase or interleaved rectifier designs using TSF20H45C.

What is the forward voltage specification of TSF20H45C at elevated temperature?

At 10 A and 125°C, the TSF20H45C exhibits a maximum forward voltage (V_F) of 0.48 V - significantly lower than conventional planar Schottky diodes. This low, stable VF across temperature improves system efficiency and reduces thermal feedback loop instability in high-ambient applications such as enclosed LED drivers or industrial adapters where TSF20H45C operates near its 150°C T_J limit.

Can TSF20H45C replace MBR2045CT in existing designs?

The TSF20H45C is a drop-in replacement for MBR2045CT in terms of pinout, package (ITO-220AB), and electrical ratings (45 V V_RRM, 20 A total I_F). However, due to its trench Schottky architecture, TSF20H45C delivers lower VF (0.48 V vs. 0.62 V) and superior high-temperature leakage (47 mA vs. 120 mA @ 125°C), enabling immediate efficiency gains without PCB changes - provided thermal mounting remains compatible.