Taiwan Semiconductor Corporation HER203G-T

Overview

HER203G-T from Taiwan Semiconductor is a 2A, 200V fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 50 ns reverse recovery time, 1.0 V forward voltage at 2A/25°C, and 60 A surge current capability. It serves as a primary output rectifier in offline AC-DC power supplies and DC-DC converters.

For engineers reviewing the HER203G-T datasheet, HER203G-T pinout, HER203G-T application, or HER203G-T equivalent, key selection criteria include V_RRM = 200 V, I_F = 2 A, t_rr = 50 ns, V_F = 1.0 V, and thermal resistance R_θJA = 60 °C/W under standard PCB mounting conditions.

Technical Context

This single-die, glass-passivated fast recovery rectifier uses planar junction construction to achieve low forward voltage and controlled reverse recovery characteristics. Its 50 ns t_rr enables efficient operation in 50–100 kHz switching topologies without excessive switching loss or EMI generation.

The device operates across –55°C to +150°C junction temperature range with 60 A non-repetitive surge rating (8.3 ms half-sine), supporting robust startup and fault transient handling in industrial power converters.

Key Specifications

Pinout & Package

Package: DO-204AC (DO-15), axial leaded, epoxy-molded case with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 1A whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH2R02 and ES2D, the HER203G-T offers balanced trade-offs: moderate t_rr (50 ns) with lowest V_F among through-hole 2A/200V rectifiers, making it ideal for cost-sensitive, thermally constrained, and legacy through-hole designs.

Availability

HER203G-T is available at Aetrix Electronics and suitable for AC-DC adapters, industrial DC-DC converters, LED drivers, and UPS battery chargers requiring stable component supply and long-lifecycle availability.

Supply support for HER203G-T 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 power, automotive, and industrial markets since 1979.

The HER20xG-T series is part of TSC's high-reliability rectifier portfolio, designed specifically for cost-effective, high-efficiency AC-DC and DC-DC power conversion in consumer, industrial, and lighting applications.

FAQ

What is the maximum junction temperature rating for HER203G-T?

The HER203G-T has a maximum junction temperature (T_JMAX) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet Version B2105. This rating applies under continuous operation with proper thermal management and is critical for derating calculations in enclosed or high-ambient environments. The HER203G-T must not exceed this limit to ensure long-term reliability and parametric stability.

Does HER203G-T have a RoHS-compliant and halogen-free construction?

Yes, the HER203G-T is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the "Features" section of the Taiwan Semiconductor datasheet. Its molding compound meets UL 94V-0 flammability rating, and its pure tin-plated leads satisfy J-STD-002 solderability requirements. These attributes make HER203G-T suitable for environmentally regulated end equipment including EU CE-marked consumer and industrial devices.

What is the reverse recovery time (t_rr) of HER203G-T and under what test conditions is it specified?

The HER203G-T has a reverse recovery time (t_rr) of 50 ns, measured under the condition I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, per the Electrical Specifications table in the Taiwan Semiconductor datasheet. This value is typical and guaranteed maximum, enabling reliable use in switching power supplies operating up to 100 kHz without significant recovery-related losses or ringing.

Can HER203G-T be used as a direct replacement for HER202G-T or HER204G-T in existing designs?

No - HER203G-T is not a direct replacement for HER202G-T (100 V) or HER204G-T (300 V), as their V_RRM ratings differ significantly. Substitution requires verification of peak reverse voltage stress in the target circuit. While all share identical package, thermal, and forward conduction specs, using HER203G-T in a 300 V design risks avalanche failure, and using it in a 50 V design wastes voltage margin without benefit. Always match V_RRM to application stress.

What is the thermal resistance (R_θJA) of HER203G-T and how does it affect PCB layout?

The HER203G-T has a junction-to-ambient thermal resistance (R_θJA) of 60 °C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). To maintain T_J ≤ 125°C at 2 A continuous current, the PCB must provide ≥1.5 cm² of 2-oz copper connected to both leads. Reducing R_θJA via internal layers or thermal vias directly improves power handling and reliability - a key consideration in compact, sealed enclosures where HER203G-T is commonly deployed.