Taiwan Semiconductor Corporation SR4040PTH

Overview

SR4040PTH from Taiwan Semiconductor is a 40A, 40V 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 dual-die construction for high-efficiency DC/DC conversion and SMPS applications.

For engineers reviewing the SR4040PTH datasheet, SR4040PTH pinout, SR4040PTH application, or SR4040PTH equivalent, key selection criteria include its 40V VRRM rating, 1.2°C/W junction-to-case thermal resistance, AEC-Q101 qualification, and compatibility with high-reliability power supplies requiring low VF and robust surge handling.

Technical Context

This Schottky rectifier uses dual-die configuration to support parallel current paths within a single TO-247AD package, enabling 40A continuous forward current while maintaining low conduction loss. Its guard ring structure provides overvoltage protection, and matte tin-plated leads meet J-STD-002 solderability standards.

The device operates across -55°C to +150°C junction temperature range, with thermal performance characterized by 1.2°C/W R_θJC, and reverse leakage limited to 1000µA at 25°C and 30mA at 100°C - critical for thermally constrained automotive and industrial power stages.

Key Specifications

Pinout & Package

Package: TO-247AD (TO-3P), 3-terminal through-hole package with isolated mounting tab; case serves as cathode terminal; anode and cathode leads are electrically isolated from heatsink when mounted with insulating hardware.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH04-M3 and MBR4045CT, SR4040PTH offers superior thermal resistance (1.2°C/W), guaranteed AEC-Q101 qualification, and optimized 40V rating for cost-sensitive 12V/24V automotive systems - making it the preferred choice where reliability, efficiency, and thermal headroom are jointly critical.

Availability

SR4040PTH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS outputs, and LED TV power stages requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant sourcing.

Supply support for SR4040PTH 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 automotive, industrial, and consumer markets since 1979.

The SR40xxPT series targets high-reliability power conversion applications, with SR4040PTH specifically engineered for AEC-Q101-compliant 40V Schottky rectification in thermally demanding automotive and industrial environments.

FAQ

What is the maximum junction temperature rating for SR4040PTH?

The SR4040PTH has a maximum junction temperature (T_J) of +150°C, with operational range from -55°C to +150°C. This extended rating supports use in under-hood automotive locations and sealed industrial enclosures where ambient temperatures exceed 85°C. The SR4040PTH maintains specified electrical parameters up to this limit when thermal design respects its 1.2°C/W R_θJC and appropriate heatsinking is applied.

Is SR4040PTH pin-compatible with other parts in the SR40xxPT family?

Yes, all SR40xxPT variants - including SR4020PTH, SR4030PTH, SR4040PTH, SR4050PTH, SR4060PTH, SR4090PTH, and SR40100PTH - share identical TO-247AD (TO-3P) package dimensions, pinout, and mechanical mounting. Voltage ratings differ, but PCB layout and thermal interface design can be reused across the family, simplifying BOM rationalization for multi-voltage platforms.

Does SR4040PTH require a heatsink in typical 40A operation?

Yes, SR4040PTH requires a heatsink for continuous 40A operation. At 40A and 0.55V VF, power dissipation exceeds 22W; with R_θJC = 1.2°C/W, even a modest 20°C temperature rise above ambient demands ≥1.7°C/W total system thermal resistance (including heatsink, interface material, and ambient). Derating to ≤25A may allow smaller heatsinks, but full-rated operation mandates active or substantial passive cooling.

What does the "H" suffix in SR4040PTH signify?

The "H" suffix in SR4040PTH indicates AEC-Q101 qualification per the Automotive Electronics Council stress test standard. This includes qualification testing for high-temperature reverse bias (HTRB), temperature cycling (TC), and highly accelerated life testing (HALT), confirming suitability for automotive power modules, body control units, and ADAS subsystems where reliability under thermal and mechanical stress is mandatory.

How does SR4040PTH's reverse leakage compare at elevated temperatures?

SR4040PTH exhibits 1000µA maximum reverse leakage (I_R) at 25°C and rated V_RRM, rising to 30mA at 100°C. This behavior is consistent with Schottky physics and aligns with its 150°C max junction rating. Designers must account for this exponential increase in leakage when sizing output capacitors and selecting feedback divider resistors in high-temperature applications to avoid regulation drift or false fault detection.