Taiwan Semiconductor Corporation SR4020PTH

Overview

SR4020PTH from Taiwan Semiconductor is a 40A, 20V AEC-Q101-qualified Schottky barrier rectifier in TO-247AD (TO-3P) package, featuring 0.55V forward voltage at 20A/25°C, 400A surge capability, and junction-to-case thermal resistance of 1.2°C/W. It serves as primary output rectifier in high-efficiency SMPS for automotive infotainment power supplies.

For engineers reviewing the SR4020PTH datasheet, SR4020PTH pinout, SR4020PTH application, or SR4020PTH equivalent, key selection criteria include its AEC-Q101 qualification, low VF at high IF, dual-die construction, TO-247AD mechanical robustness, and 125°C/150°C max junction temperature rating.

Technical Context

This device implements a dual-die Schottky structure with guard ring overvoltage protection, enabling stable operation under repetitive reverse voltage stress up to 20V. Its 1.2°C/W R_θJC supports high-power dissipation in constrained thermal environments without forced airflow.

The 400A non-repetitive surge rating (8.3ms half-sine) and 1000µA max reverse leakage at 25°C confirm suitability for transient-heavy DC-DC outputs. Matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.

Key Specifications

Pinout & Package

TO-247AD (TO-3P) package with three terminals: Anode (pin 1), Cathode (pin 2), and case-connected cathode tab (pin 3). Mounting torque limited to 1.13 N·m; 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-40CPH02-M3 and MBR4020CT, SR4020PTH uniquely combines AEC-Q101 qualification, TO-247AD mechanical ruggedness, and 1.2°C/W thermal resistance-making it the only option qualified for under-hood automotive power modules requiring long-term reliability at 125°C ambient.

Availability

SR4020PTH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial DC-DC converters, flat-panel display power supplies, and AC-DC adapters requiring stable component supply with full traceability and long-lifecycle support.

Supply support for SR4020PTH 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 discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and computing markets since 1979.

The SR40xPT series targets high-reliability power conversion applications requiring AEC-Q101 compliance, low forward drop, and robust surge immunity-specifically engineered for next-generation automotive and industrial SMPS designs.

FAQ

What is the maximum junction temperature rating for SR4020PTH?

The SR4020PTH has a dual-rated maximum junction temperature of 125°C and 150°C, depending on test condition and lifetime requirement. At 125°C, it supports extended operational life in automotive cabin environments; at 150°C, it allows short-term overload tolerance during transient events while maintaining reliability per AEC-Q101 stress testing protocols. The SR4020PTH datasheet specifies both ratings explicitly in the Absolute Maximum Ratings table.

Is SR4020PTH pin-compatible with other parts in the SR40xPT family?

Yes, all SR40xPT and SR40xPTH variants-including SR4020PTH, SR4030PTH, and SR40100PTH-share identical TO-247AD (TO-3P) package dimensions, pinout, and terminal assignments. This allows direct voltage-rating substitution (e.g., upgrading from 20V to 40V) without PCB layout changes, provided thermal and electrical design margins accommodate the higher V_RRM and associated VF increase.

Does SR4020PTH require a heatsink in 40A continuous operation?

Yes, SR4020PTH requires a heatsink for 40A continuous operation. With 0.55V forward voltage, conduction loss reaches ~22W at full load. Given its 1.2°C/W junction-to-case thermal resistance, a heatsink with ≤2.5°C/W junction-to-ambient resistance is necessary to maintain T_J ≤125°C at 25°C ambient. The SR4020PTH mechanical data sheet specifies mounting torque (1.13 N·m) and recommends thermal interface material for optimal contact.

What does the 'H' suffix in SR4020PTH signify?

The 'H' suffix in SR4020PTH indicates full AEC-Q101 qualification per revision H2103 of Taiwan Semiconductor's product specification. This includes passing stress tests for high-temperature reverse bias (HTRB), temperature cycling (TC), and unbiased highly accelerated stress test (uHAST), confirming suitability for automotive power electronics. Non-H versions (e.g., SR4020PT) lack this qualification and are restricted to commercial/industrial use.

How does the guard ring feature improve reliability of SR4020PTH?

The guard ring in SR4020PTH mitigates electric field crowding at the silicon periphery, preventing premature avalanche breakdown under repetitive reverse voltage stress. This design ensures stable 20V V_RRM performance across temperature and lifetime, reducing reverse leakage drift and enabling consistent operation in noisy automotive power rails. The SR4020PTH datasheet confirms guard ring implementation in the Features section and Mechanical Data page.