Taiwan Semiconductor Corporation SR509H

Overview

SR509H from Taiwan Semiconductor is an AEC-Q101-qualified 5A, 90V Schottky barrier rectifier in DO-201AD package, featuring low forward voltage (0.85 V at 5 A, 25°C), high surge capability (120 A), and guard-ring overvoltage protection-used in automotive-grade DC/DC converters and industrial SMPS.

For engineers reviewing the SR509H datasheet, SR509H pinout, SR509H application, or SR509H equivalent, key selection factors include its 90 V repetitive peak reverse voltage, 5 mA reverse leakage at 125°C, 6°C/W junction-to-case thermal resistance, and AEC-Q101 qualification for under-hood power conversion.

Technical Context

The SR509H implements a single-die Schottky structure with guard ring for enhanced dv/dt immunity (10,000 V/µs) and operates across –55°C to +150°C junction temperature range. Its low VF and high IFSM support high-efficiency, high-reliability rectification in compact, thermally constrained layouts.

Designed for unidirectional current flow, it delivers stable performance under pulsed forward conditions (0.3 ms pulse width) and withstands repetitive reverse voltages up to 90 V with <100 µA leakage at 25°C and <5 mA at 125°C.

Key Specifications

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; leads are pure tin plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-50SQ090 and SB590, the SR509H uniquely combines AEC-Q101 qualification, 0.85 V VF, and 5 mA IR at 125°C-making it optimal for thermally demanding automotive power rails where reliability and leakage control are co-critical.

Availability

SR509H is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS, and USB-C PD adapters requiring stable component supply with long-term lifecycle assurance.

Supply support for SR509H 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 consumer markets since 1979.

The SR502–SR520 series was developed to deliver AEC-Q101-compliant Schottky rectifiers with optimized VF–VRRM trade-offs for next-generation vehicle electrification and high-density power supplies.

FAQ

What is the maximum junction temperature rating for SR509H?

The SR509H has a maximum junction temperature (TJ max) of +150°C, validated per AEC-Q101 stress testing. This rating allows reliable operation in under-hood automotive environments and high-ambient industrial settings. The SR509H maintains specified electrical parameters-including 5 mA reverse leakage-up to this limit, provided thermal design meets RθJC = 6°C/W and RθJA ≤ 35°C/W constraints.

Is SR509H pin-compatible with other parts in the SR502–SR520 family?

Yes, all SR502–SR520 devices-including SR509H-share identical DO-201AD package dimensions, anode/cathode pinout, and mechanical footprint. This enables drop-in substitution across voltage grades (20 V to 200 V) without PCB layout changes, provided thermal and electrical margins are verified for the specific VRRM and VF requirements of the target application.

Does SR509H require derating at elevated ambient temperatures?

Yes, SR509H must be derated above 25°C ambient per its forward current derating curve: at 75°C TA, IF drops to ~3.5 A; at 100°C TA, it falls to ~2.2 A. Derating ensures junction temperature stays within the +150°C limit given RθJA = 35°C/W. For sustained 5 A operation above 25°C, forced airflow or PCB copper thermal spreading is required.

What does the "H" suffix in SR509H signify?

The "H" suffix in SR509H explicitly denotes AEC-Q101 qualification per Rev. J2105 documentation. This certification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing (uHAST). Non-H variants (e.g., SR509) lack this validation and are not approved for automotive power applications.

How does SR509H's reverse leakage compare to SR505 and SR510 at high temperature?

At 125°C and rated VR, SR509H exhibits 5 mA reverse leakage-identical to SR510 and lower than SR505 (10 mA). This reflects tighter process control for higher-voltage Schottky dies: SR502–SR506 show higher IR due to lower barrier height, while SR509/SR510/SR515/SR520 achieve lower leakage through optimized metallization and guard ring geometry. The SR509H thus offers superior standby efficiency in always-on systems.