Taiwan Semiconductor Corporation HER201G R0G

Overview

HER201G from Taiwan Semiconductor is a 2 A, 50 V high-efficiency glass-passivated axial-lead rectifier diode in DO-204AC (DO-15) package, featuring 1.0 V forward voltage at 2 A and 5 µA reverse leakage at 25°C, used in DC-DC converters and freewheeling paths.

For engineers reviewing the HER201G datasheet, HER201G pinout, HER201G application, or HER201G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), surge current capability (60 A), thermal resistance (60 °C/W), junction temperature range (–55 to +150 °C), and RoHS/halogen-free compliance.

Technical Context

The HER201G is a single-die, fast-recovery silicon rectifier optimized for switching-mode power supplies. Its 50 ns reverse recovery time and low VF enable reduced conduction and switching losses in high-frequency converters.

Designed with glass passivation for enhanced reliability, it supports continuous forward current up to 2 A with derating above 75°C ambient and withstands 60 A non-repetitive surge per JEDEC standard, making it suitable for transient-heavy freewheeling and inverter applications.

Key Specifications

Pinout & Package

DO-204AC (DO-15) axial-leaded package with cathode band marking; leads are pure tin-plated, J-STD-002 solderable, and meet JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-efficiency rectifier applications.

Compared with STTH2R06 and MBR2100CT, HER201G offers optimal balance of 50 V blocking, 1.0 V VF, 50 ns trr, and DO-15 form factor for cost-sensitive, space-constrained 12–24 V DC-DC designs requiring AEC-Q101 availability.

Availability

HER201G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling applications requiring stable component supply, long-term lifecycle support, and automotive-grade qualification options.

Supply support for HER201G 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 industrial, computing, and automotive markets since 1979.

The HER201G belongs to TSC's high-efficiency rectifier product line, engineered specifically for high-frequency switching power conversion where low VF, fast trr, and robust thermal performance are critical in compact, cost-driven designs.

FAQ

What is the maximum junction temperature rating for HER201G?

The HER201G has a maximum junction temperature (TJ MAX) of +150°C, allowing reliable operation in high-ambient environments such as enclosed power supplies and automotive engine compartments. This rating is validated under steady-state conduction and transient surge conditions per JEDEC standards. Derating begins above 75°C ambient, and the device must be mounted with adequate PCB copper area to maintain TJ ≤ 150°C under full 2 A load. HER201G maintains specified electrical parameters within this thermal envelope.

Is HER201G RoHS and halogen-free compliant?

Yes, HER201G is fully RoHS compliant and halogen-free per IEC 61249-2-21, using lead-free pure tin-plated leads and UL 94V-0 molding compound. These materials meet global environmental directives for consumer, industrial, and automotive electronics. The halogen-free status ensures reduced corrosive gas emission during soldering and end-of-life recycling. HER201G documentation confirms compliance without exemptions, and material declarations are available upon request from Taiwan Semiconductor.

What does the 'G' suffix in HER201G indicate?

The 'G' suffix in HER201G denotes green compound packaging-specifically, halogen-free epoxy molding compound meeting IEC 61249-2-21. It is distinct from the 'H' suffix (e.g., HER201GH), which indicates AEC-Q101 qualification. HER201G itself is not AEC-Q101 certified, but the 'G' assures environmentally compliant materials and UL 94V-0 flammability rating. This designation appears in Taiwan Semiconductor's official ordering code table and applies uniformly across the HER201G–HER208G family.

How is the polarity marked on HER201G?

HER201G uses a cathode band marking on the body to indicate polarity-the banded end is the cathode terminal, and the unmarked end is the anode. This marking aligns with industry-standard DO-204AC (DO-15) conventions and is visible under standard optical inspection. Correct orientation is critical for forward conduction; reverse installation blocks current flow and may cause circuit malfunction. The band is laser-etched or molded and remains legible after reflow soldering per J-STD-002 specifications.

What is the typical forward voltage drop of HER201G at rated current?

The typical forward voltage drop (VF) of HER201G is 1.0 V at IF = 2 A and TJ = 25°C, as specified in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating effects. At elevated junction temperatures (e.g., 125°C), VF decreases slightly (~0.92 V), improving conduction efficiency in thermally stressed operation. HER201G's low VF directly reduces power dissipation (P = VF × IF) versus standard rectifiers, supporting higher efficiency in compact power designs.