Taiwan Semiconductor Corporation ABS4 REG

Overview

ABS4 REG from Taiwan Semiconductor is a 1A, 400V standard bridge rectifier in ABS package, featuring glass-passivated junctions, 30A peak surge current capability, and UL Recognized (E-326854) construction. It serves as the AC-to-DC front-end rectifier in compact off-line power supplies for LED drivers and consumer adapters.

For engineers reviewing the ABS4 REG datasheet, ABS4 REG pinout, ABS4 REG application, or ABS4 REG equivalent, key selection criteria include repetitive peak reverse voltage (400 V), forward current rating (1.0 A on aluminum substrate), thermal resistance (R_θJL = 25 °C/W), and AEC-Q101 qualification availability (ABS4H variant).

Technical Context

The ABS4 REG integrates four silicon diodes in a single-phase full-wave bridge configuration with common-cathode and common-anode terminals. Its glass-passivated chip junction ensures stable reverse leakage (<10 µA at 25°C, <150 µA at 125°C) and high reliability under thermal cycling.

Designed for surface-mount assembly on FR-4 or aluminum substrates, it supports automated placement and delivers 3.74 A²s fusing I²t rating under 8.3 ms half-sine surge, enabling robust operation in transient-prone AC line inputs.

Key Specifications

Pinout & Package

Package: ABS - Molded plastic case with matte tin-plated leads, UL 94V-0 rated, 0.120 g weight, polarity marked on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU4K and DB104, ABS4 REG offers optimized SMT manufacturability in compact ABS form factor, lower R_θJL than DB104, and tighter V_F consistency than GBU4K-making it preferred for space-constrained, thermally managed adapter and lighting designs.

Availability

ABS4 REG is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and USB wall adapters requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for ABS4 REG 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 and protection markets since 1979.

The ABS series was developed specifically for cost-sensitive, high-volume AC/DC front-end rectification in consumer and industrial power supplies-emphasizing reliability, manufacturability, and regulatory compliance (UL, AEC-Q101, RoHS, halogen-free).

FAQ

What is the maximum junction temperature rating for ABS4 REG?

The ABS4 REG has a maximum junction temperature (T_J) rating of +150 °C, verified per absolute maximum ratings table in Taiwan Semiconductor's M2103 datasheet. This allows operation in enclosed or high-ambient environments typical of LED drivers and adapters. Derating curves confirm usable current capacity down to 0.8 A at 70 °C ambient on FR-4 board. The ABS4 REG must be operated within this limit to ensure long-term reliability and avoid thermal runaway.

Does ABS4 REG support automotive-grade qualification?

Yes-the ABS4H variant of ABS4 REG is AEC-Q101 qualified, as explicitly stated in the "FEATURES" section of the datasheet. Standard ABS4 REG is not AEC-Q101 qualified; only ABS4H carries that qualification. Engineers requiring automotive use must specify ABS4H and verify packaging (Tape & Reel) and marking ('H' suffix) on the device body. The ABS4 REG itself is intended for industrial and consumer applications unless upgraded to the H-grade version.

What is the forward voltage drop specification for ABS4 REG at rated current?

The ABS4 REG specifies a maximum forward voltage (V_F) of 0.95 V per diode at I_F = 0.4 A and T_J = 25 °C, per electrical specifications table. Since it is a full-wave bridge, total conduction drop across the conducting path is ~1.9 V at this condition. This value is measured under pulsed test (PW = 0.3 ms) and remains stable due to glass passivation. The ABS4 REG's V_F directly impacts efficiency in low-voltage-output SMPS designs.

How does the ABS4 REG package compare to GBU or KBP packages in size and thermal performance?

The ABS4 REG uses the compact ABS surface-mount package (dimensions per datasheet outline drawing), measuring smaller than GBU (18.5 × 13.5 mm) and KBP (15.7 × 10.0 mm). Its R_θJL = 25 °C/W is lower than typical KBP (≈30 °C/W) and significantly better than GBU (≈35 °C/W), enabling superior heat transfer to PCB copper. Unlike through-hole KBP or GBU, ABS4 REG is SMT-only-requiring reflow, not wave soldering. The ABS4 REG thus favors space-constrained, thermally efficient layouts.

Is ABS4 REG compliant with halogen-free and RoHS requirements?

Yes-ABS4 REG is explicitly certified halogen-free per IEC 61249-2-21 and RoHS compliant, as confirmed in the "FEATURES" section of the official datasheet. These compliance statements apply to the standard ABS4 REG part (not limited to ABS4H). Material declarations and test reports are available from Taiwan Semiconductor upon request. For regulated markets including EU and China, ABS4 REG satisfies both environmental directives without requiring special ordering codes or variants.