Taiwan Semiconductor Corporation HER303GH

Overview

HER303GH from Taiwan Semiconductor is a high-efficiency, AEC-Q101-qualified ultrafast recovery rectifier diode in DO-201AD package, rated for 3A average forward current, 200V repetitive peak reverse voltage (V_RRM), and 50ns reverse recovery time (t_rr). It delivers low forward voltage drop (1.0V at 3A, 25°C) and high surge capability (125A IFSM), making it suitable for automotive-grade DC-DC converters and switching-mode power supplies.

For engineers reviewing the HER303GH datasheet, HER303GH pinout, HER303GH application, or HER303GH equivalent, key selection considerations include its AEC-Q101 qualification, 200V V_RRM, 50ns t_rr, DO-201AD mechanical compatibility, and thermal resistance (R_θJL = 10°C/W) for thermally constrained automotive and industrial power designs.

Technical Context

This device is a single-die, planar-passivated silicon rectifier optimized for high-frequency switching applications. Its ultrafast recovery (t_rr ≤ 50ns) minimizes switching losses in hard-switched topologies, while the low VF (1.0V typ. @ 3A) reduces conduction loss under continuous load.

The DO-201AD package provides robust thermal performance (R_θJA = 35°C/W, R_θJL = 10°C/W) and meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements. Cathode polarity is marked by a visible band on the body.

Key Specifications

Pinout & Package

HER303GH uses the DO-201AD axial-leaded package with cathode indicated by a painted band. Leads are pure tin-plated and solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-HER303G and MUR320, HER303GH uniquely combines automotive qualification, 50ns recovery, and 1.0V V_F-enabling compact, high-efficiency, and safety-compliant rectification where reliability and thermal headroom are critical.

Availability

HER303GH is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial switch-mode power supplies, and LED driver power stages requiring stable component supply with AEC-Q101 assurance and long-term lifecycle support.

Supply support for HER303GH 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 global automotive, industrial, and consumer markets since 1979.

The HER30xG family was designed specifically for high-reliability, high-frequency rectification in automotive power conversion-emphasizing AEC-Q101 compliance, ultrafast recovery, and robust thermal performance in standard DO-201AD packaging.

FAQ

What does the 'H' suffix in HER303GH signify?

The 'H' suffix in HER303GH indicates full AEC-Q101 qualification per Rev D. This includes stress testing across temperature cycling, high-temperature operating life, and unbiased highly accelerated stress test-ensuring suitability for automotive under-hood applications. HER303GH is not merely a screened version of HER303G; it undergoes dedicated qualification per automotive reliability standards.

Is HER303GH pin-compatible with standard DO-201AD rectifiers like 1N5408?

Yes, HER303GH uses the standard DO-201AD package with identical mechanical dimensions and lead spacing as 1N5408 and other DO-201AD rectifiers. However, its ultrafast recovery (50ns vs. >2000ns for 1N5408) and lower V_F make it unsuitable as a direct replacement in low-frequency linear supplies where slow recovery is benign-but ideal for high-frequency switching circuits where fast recovery is mandatory.

What is the maximum allowable case temperature for continuous operation of HER303GH?

HER303GH supports continuous operation up to 150°C junction temperature (T_J). With R_θJL = 10°C/W, maintaining case temperature ≤ 125°C ensures T_J stays within limit at 3A I_F. Derating curves in the datasheet show usable current drops to ~2.2A at 100°C case temperature, enabling design flexibility in thermally constrained PCB layouts.

Does HER303GH require a heatsink in typical 3A applications?

HER303GH typically does not require an external heatsink when mounted on ≥1 sq-in copper area (2 oz) with two thermal vias per lead. Its R_θJL = 10°C/W allows efficient heat transfer to the PCB. For ambient temperatures above 70°C or sustained 3A loads, adding minimal copper pour or a small clip-on heatsink improves margin-especially important in AEC-Q101-compliant automotive modules where thermal reliability is audited.

How does HER303GH's reverse recovery behavior compare to HER306GH?

HER303GH has t_rr ≤ 50ns, while HER306GH (600V V_RRM) is rated at ≤ 75ns due to higher voltage die construction. Both share identical package and thermal specs, but HER303GH's faster recovery enables higher switching frequencies and lower EMI in 200V-class designs-making it preferred for 12V/24V automotive DC-DC and compact industrial SMPS where voltage margin is sufficient.