Taiwan Semiconductor Corporation BY252G

Overview

BY252G from Taiwan Semiconductor is a single-die standard rectifier diode in DO-201AD package, rated for 3 A average forward current, 400 V repetitive peak reverse voltage (V_RRM), and 150 A non-repetitive surge current (I_FSM). It delivers low forward voltage (≤1.0 V at 3 A, 25°C) and low reverse leakage (≤5 µA at 25°C), enabling efficient operation in high-frequency switching power supplies.

For engineers reviewing the BY252G datasheet, BY252G pinout, BY252G application, or BY252G equivalent, key selection criteria include its 400 V V_RRM, DO-201AD mechanical compatibility, thermal resistance (R_θJA = 40 °C/W), and suitability for DC-DC converters requiring robust surge handling and RoHS-compliant, halogen-free construction.

Technical Context

The BY252G is a silicon planar junction rectifier optimized for general-purpose and switching-mode power conversion. Its single-die DO-201AD construction supports high reliability under thermal cycling and mechanical stress, with cathode polarity marked by a band and pure tin-plated leads compliant with J-STD-002 solderability.

It operates across -55°C to +150°C junction temperature range and exhibits typical junction capacitance of 40 pF at 1 MHz/4 V, supporting stable performance in moderate-frequency rectification where fast recovery is not required but surge robustness is critical.

Key Specifications

Pinout & Package

Package: DO-201AD - Axial leaded, molded plastic case with UL 94V-0 flammability rating, cathode indicated by band, 1.20 g typical weight, pure tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L04 and 1N5404, the BY252G offers the lowest forward voltage and best thermal resistance among the three, making it optimal for thermally constrained, cost-sensitive 50–100 kHz rectification where ultrafast recovery is unnecessary.

Availability

BY252G is available at Aetrix Electronics and suitable for DC–DC converters, switching inverters, and industrial power supplies requiring stable component supply, RoHS compliance, and proven surge robustness.

Supply support for BY252G 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 consumer markets since 1979.

The BY252G belongs to TSC's BY25xG standard rectifier family, designed specifically for cost-effective, high-reliability AC/DC and DC/DC power conversion where high surge tolerance and low conduction loss are prioritized over ultrafast switching.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for BY252G?

The BY252G has a V_RRM of 400 V, as specified in the Absolute Maximum Ratings table. This value is fixed for the BY252G variant within the BY251G–BY254G series and is validated under standard test conditions (TA = 25°C). Exceeding 400 V may cause irreversible avalanche breakdown. The BY252G datasheet confirms this rating is not derated at elevated temperatures for continuous operation.

Is BY252G RoHS and halogen-free compliant?

Yes, BY252G is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the official Taiwan Semiconductor datasheet (Version D2105). The molding compound and plating meet these requirements, and the "G" suffix in the part number denotes green (halogen-free) packaging. No exemptions or exceptions apply to this ordering code.

What package type does BY252G use, and what are its key mechanical attributes?

BY252G uses the DO-201AD package: an axial-leaded, molded plastic case with UL 94V-0 flammability rating, cathode polarity marked by a band, pure tin-plated leads compliant with J-STD-002, and JESD 201 Class 1A whisker resistance. Its typical weight is 1.20 g, and it is supplied in tape-and-reel (1,250 units) or ammo box (500 units) packaging.

What is the forward voltage (V_F) specification for BY252G, and under what conditions is it measured?

The BY252G has a maximum forward voltage of 1.0 V, measured at I_F = 3 A and T_J = 25°C using a pulse test (PW = 0.3 ms). This value represents worst-case conduction loss under nominal operating conditions. At higher junction temperatures (e.g., 125°C), V_F decreases slightly, but the 1.0 V limit remains valid for thermal design margining.

How does BY252G compare to BY251G and BY253G in terms of voltage rating and interchangeability?

BY252G is rated for 400 V V_RRM, distinct from BY251G (200 V) and BY253G (600 V). These variants share identical package (DO-201AD), current rating (3 A), thermal resistance (40 °C/W), and pinout, but differ only in reverse voltage capability. They are not interchangeable without verifying circuit voltage stress margins; substituting BY252G for BY253G risks premature failure in 600 V applications.