Taiwan Semiconductor Corporation SR804H

Overview

SR804H from Taiwan Semiconductor is an AEC-Q101-qualified 8A, 40V Schottky barrier rectifier in DO-201AD package, featuring 0.55V forward voltage at 8A/25°C, 150A surge capability, and guard ring overvoltage protection-used in automotive-grade DC-DC converters and SMPS secondary-side rectification.

For engineers reviewing the SR804H datasheet, SR804H pinout, SR804H application, or SR804H equivalent, key selection criteria include its 40V V_RRM, AEC-Q101 qualification, 150A I_FSM, thermal resistance of 40°C/W, and DO-201AD mechanical compatibility with high-reliability power conversion designs.

Technical Context

This single-die Schottky rectifier operates with a maximum junction temperature of +125°C (derated to +150°C for selected variants), supports 10,000 V/µs dv/dt, and delivers low conduction loss due to its optimized metal-semiconductor junction. Its guard ring structure enhances ruggedness against transient overvoltage events common in automotive load-dump conditions.

The device exhibits 500 µA max reverse leakage at 25°C and 15 mA at 100°C under rated 40V reverse bias, enabling stable operation in thermally constrained environments. Thermal performance is characterized by R_θJA = 40°C/W, validated per JEDEC JESD51-2 standards using standard PCB mounting conditions.

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-8EWH04-M3/45 and SB840-E3/45, the SR804H uniquely combines AEC-Q101 qualification, 150A I_FSM, and 0.55V V_F in a single DO-201AD offering-making it optimal for automotive power supplies requiring both ruggedness and efficiency.

Availability

SR804H is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS, and USB-C PD adapters requiring stable component supply with full AEC-Q101 traceability and long-term production support.

Supply support for SR804H 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 SR802–SR820 family was designed specifically for high-reliability, medium-current Schottky rectification in automotive and industrial power conversion-emphasizing AEC-Q101 compliance, thermal robustness, and consistent parametric performance across voltage grades.

FAQ

What is the maximum junction temperature rating for SR804H?

The SR804H has a maximum junction temperature (T_J) rating of +125°C, validated under AEC-Q101 stress testing protocols. This rating applies across its full operating range and supports reliable operation in under-hood automotive environments where ambient temperatures reach +85°C. The SR804H datasheet specifies derating curves confirming sustained 8A operation up to this limit with appropriate PCB thermal relief.

Is SR804H pin-compatible with other devices in the SR802–SR820 series?

Yes, all SR802–SR820 devices-including SR804H-share identical DO-201AD packaging, axial lead configuration, and cathode-band polarity marking. This ensures mechanical and layout compatibility across the series, allowing voltage-grade substitution (e.g., SR804H → SR806H) without PCB revision, provided thermal and electrical margins remain satisfied.

Does SR804H require a heatsink in typical 8A applications?

In standard FR-4 PCB layouts with 1-in² 2-oz copper pad, the SR804H's R_θJA of 40°C/W allows operation at 8A with ≤32°C temperature rise above ambient-typically eliminating need for external heatsinks. However, in enclosed or high-ambient (>70°C) environments, thermal simulation using the provided transient impedance curve (Fig.6) is recommended before final thermal design.

What does the "H" suffix signify in SR804H?

The "H" suffix in SR804H explicitly denotes AEC-Q101 qualification per the Taiwan Semiconductor ordering matrix. It confirms full compliance with the AEC-Q101 stress test standard-including HTOL, temperature cycling, HAST, and ESD-distinguishing it from non-H variants (e.g., SR804) intended for commercial applications only.

How does SR804H's reverse leakage compare to SR805H at elevated temperature?

At 100°C and rated 40V reverse bias, SR804H specifies ≤15 mA reverse current, whereas SR805H (50V grade) specifies ≤10 mA under identical conditions. This reflects the inherent trade-off between lower V_RRM and higher leakage in Schottky structures-SR804H's higher leakage is fully characterized and acceptable for its target 40V applications such as 12V/24V automotive rails.