Taiwan Semiconductor Corporation SR2040PTH

Overview

SR2040PTH from Taiwan Semiconductor is a 20A, 40V AEC-Q101-qualified Schottky barrier rectifier in TO-247AD (TO-3P) package, featuring 0.55V forward voltage at 10A/25°C, 200A surge capability, and guard ring overvoltage protection - deployed in automotive-grade DC-DC converters and industrial SMPS.

For engineers reviewing the SR2040PTH datasheet, SR2040PTH pinout, SR2040PTH application, or SR2040PTH equivalent, key selection criteria include its 40V V_RRM, 1.5°C/W R_θJC, dual-die construction, AEC-Q101 qualification, and compatibility with high-efficiency 20A switching power stages requiring low conduction loss and robust thermal performance.

Technical Context

This Schottky rectifier uses dual silicon dies in a single TO-247AD package to deliver 20A average forward current with low VF and high IFSM. Its guard ring structure enhances ruggedness against transient overvoltage events, while the matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.

The device operates across -55°C to +150°C junction temperature range and exhibits 500µA max reverse leakage at 25°C and rated VR. Thermal resistance from junction-to-case is fixed at 1.5°C/W, enabling predictable heatsink sizing for continuous 20A operation in constrained thermal environments.

Key Specifications

Pinout & Package

Package: TO-247AD (TO-3P), 3-terminal through-hole package with isolated mounting tab, UL 94V-0 molding compound, matte tin-plated leads, polarity marked on case.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20BQ040-M3/45 and MBR2040CT, SR2040PTH offers lower forward voltage, superior thermal resistance, and automotive qualification - making it optimal for space-constrained, thermally demanding, and safety-critical 20A rectification where reliability and efficiency are prioritized over generic substitution.

Availability

SR2040PTH is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS outputs, and consumer adapter rectification requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.

Supply support for SR2040PTH 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 global automotive, industrial, and consumer markets since 1979.

The SR20xxPT series is part of TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in automotive infotainment, body control modules, and industrial power supplies.

FAQ

What is the maximum junction temperature rating for SR2040PTH?

The SR2040PTH has a maximum junction temperature (T_J) rating of +150°C, verified per AEC-Q101 stress testing. This allows reliable operation in under-hood automotive environments and sealed industrial enclosures where ambient temperatures exceed 85°C. The SR2040PTH maintains full 20A current capability up to T_C = 80°C, and derates linearly beyond that based on its 1.5°C/W R_θJC.

Is SR2040PTH pin-compatible with other TO-247AD Schottky rectifiers?

Yes, SR2040PTH uses standard TO-247AD (TO-3P) mechanical dimensions and 3-pin terminal layout (Anode–Cathode–Case), matching industry-standard footprints. However, internal connections differ: SR2040PTH is single-anode/single-cathode, unlike dual-cathode variants such as MBR2040CT. Always verify pin function alignment using the official SR2040PTH marking diagram before PCB reuse.

Does SR2040PTH require a heatsink for 20A continuous operation?

Yes - at 20A continuous current and 25°C ambient, SR2040PTH dissipates approximately 11W (based on 0.55V V_F). With R_θJC = 1.5°C/W and typical R_θCS + R_θSA ≥ 1.0°C/W, a heatsink capable of ≤2.5°C/W total thermal resistance is required to maintain T_J ≤ 130°C. Mounting torque must not exceed 1.13 N·m to avoid package damage.

What does the "H" suffix in SR2040PTH signify?

The "H" suffix in SR2040PTH explicitly denotes AEC-Q101 qualification - confirmed by Taiwan Semiconductor's qualification report and UL Recognition File #E-326243. This includes testing for high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and electrostatic discharge (ESD). Standard SR2040PT lacks this validation.

How does SR2040PTH's guard ring improve system reliability?

The guard ring in SR2040PTH provides lateral edge termination that suppresses premature edge avalanche during voltage transients, increasing the device's effective V_RRM margin beyond 40V. In practice, this reduces failure rate in SMPS subjected to line surges or inductive kickback, especially in automotive 12V systems where load dump events reach ±125V. It also improves consistency of reverse leakage across temperature and lot variations.