Taiwan Semiconductor Corporation GBU402

Overview

GBU402 from Taiwan Semiconductor is a 4A, 100V repetitive peak reverse voltage (V_RRM) standard bridge rectifier in GBU package, featuring 1500V_RMS dielectric strength, 150A surge current (8.3ms), and AEC-Q101-qualified variants. It serves as AC-to-DC conversion core in compact power supplies for consumer adapters and LED drivers.

For engineers reviewing the GBU402 datasheet, GBU402 pinout, GBU402 application, or GBU402 equivalent, key selection criteria include V_RRM = 100V, I_F = 4A, I_FSM = 150A, R_θJA = 20°C/W, and UL Recognized File # E-326243 compliance.

Technical Context

The GBU402 integrates four silicon diodes in a single-phase full-wave bridge configuration with quad-terminal layout (AC1, AC2, +, –). Its thermal design supports 150°C maximum junction temperature and delivers 4A average forward current at case temperatures up to 75°C per derating curve.

Electrical behavior is defined by 1.1V max forward voltage at 4A/25°C, 5µA max reverse leakage at 25°C, and 100pF typical junction capacitance per diode at 1MHz/4V - parameters confirmed across GBU401–GBU404 family members in official datasheet revision M2103.

Key Specifications

Pinout & Package

GBU402 uses the industry-standard GBU molded plastic package (19.0 × 13.0 × 16.5 mm), with matte tin-plated leads compliant with J-STD-002 solderability requirements and UL 94V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU4K and KBU4B, the GBU402 offers superior surge robustness (150A vs. ≤120A), better thermal resistance (R_θJC = 4°C/W), and optional AEC-Q101 qualification - making it preferred for automotive lighting and industrial SMPS where reliability under stress is critical.

Availability

GBU402 is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and USB-C wall adapters requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for GBU402 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 industrial, computing, and consumer markets since 1979.

The GBU series was designed specifically for high-reliability AC/DC front-end rectification in compact, thermally constrained power supplies - emphasizing surge resilience, safety certification readiness, and PCB-mounting compatibility.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for GBU402?

The GBU402 has a V_RRM rating of 100 V, meaning it can block up to 100 volts of reverse voltage repeatedly without breakdown. This value is specified in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version M2103) and applies strictly to the GBU402 variant - distinct from GBU401 (50V) and GBU403 (200V). The 100V rating ensures safe operation with 120VAC mains after accounting for peak voltage (≈170V) and safety margins.

Does GBU402 have AEC-Q101 qualification?

Yes, the AEC-Q101-qualified version of GBU402 is designated as GBU402H and is explicitly listed in the Ordering Information section of the Taiwan Semiconductor datasheet. The standard GBU402 is not automatically qualified; only units marked with the "H" suffix meet AEC-Q101 stress test requirements for automotive applications. GBU402H undergoes extended temperature cycling, humidity testing, and mechanical shock validation per the AEC standard.

What is the forward voltage (V_F) of GBU402 at rated current?

The GBU402 exhibits a maximum forward voltage of 1.1 V per diode at 4 A and 25°C junction temperature, as stated in the Electrical Specifications table. This value reflects worst-case conduction loss under full-load conditions and directly impacts power dissipation (P_cond ≈ 4.4 W for the full bridge). At 2 A, V_F drops to ≤1.0 V, improving light-load efficiency.

How does the thermal resistance of GBU402 affect heatsink selection?

With a junction-to-ambient thermal resistance (R_θJA) of 20°C/W, the GBU402 requires careful thermal management at full 4 A load. For example, at 4 A and 1.1 V V_F, power dissipation reaches ~4.4 W, resulting in a 88°C rise above ambient - exceeding the 150°C T_JMAX limit if ambient exceeds 62°C. Therefore, forced air or a small heatsink is recommended for continuous operation above 60°C ambient, as confirmed by the Forward Current Derating Curve in the GBU401–GBU407 datasheet.

What is the marking code and package type for GBU402?

The GBU402 is marked "GBU402" on the device body and uses the GBU package - a standardized 4-pin, single-in-line (SIL) molded plastic housing measuring 19.0 × 13.0 × 16.5 mm. The package features matte tin-plated leads compliant with J-STD-002, UL 94V-0 flammability rating, and polarity indicated by a white bar adjacent to the "+" terminal. This physical form factor is identical across the GBU401–GBU407 family.