Diodes Incorporated GBU25KH

Overview

GBU25KH from Diodes Incorporated is a 25A, 800V standard recovery bridge rectifier in GBU package, featuring glass-passivated die construction, 350A non-repetitive surge capability, and low 10µA reverse leakage at 25°C. It delivers reliable AC-to-DC conversion in industrial power supplies, motor drive front-ends, and HVAC control systems with through-hole mounting and UL recognition.

For engineers reviewing the GBU25KH datasheet, GBU25KH pinout, GBU25KH application, or GBU25KH equivalent, key selection criteria include peak repetitive reverse voltage (800V), average forward current with heatsink (25A), thermal resistance junction-to-case (1.7°C/W), and compliance with RoHS, halogen-free, and AEC-Q200-ready manufacturing standards.

Technical Context

This single-phase, full-wave bridge rectifier uses four series-connected standard recovery diodes in a molded plastic GBU package. Its 800V VRRM rating supports line-voltage applications up to 560V RMS, while the 350A IFSM surge rating enables robust operation during inrush events in inductive loads.

Thermal performance is defined by RθJC = 1.7°C/W (with heatsink) and RθJL = 1.0°C/W, supporting continuous conduction in ambient temperatures from –55°C to +175°C. Capacitance per element is 93pF at 1MHz/4V, minimizing high-frequency switching noise in legacy linear power designs.

Key Specifications

Pinout & Package

Package: GBU - Molded plastic, UL 94V-0 rated, through-hole mountable with #6 screw, 4g mass, matte tin terminals solderable per MIL-STD-202 Method 208.

Key Features

Applications

Availability

GBU25KH is available at Aetrix Electronics and suitable for industrial power supplies, motor drive front-ends, and HVAC control systems requiring stable component supply across multi-year production cycles.

Supply support for GBU25KH 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The GBU-series bridge rectifiers are engineered for high-reliability AC/DC conversion in cost-sensitive, thermally constrained industrial and appliance applications where standard recovery speed and rugged surge handling are prioritized.

FAQ

What is the maximum case temperature for continuous 25A operation?

The GBU25KH sustains 25A average forward current only when mounted on an adequately sized heatsink that maintains case temperature (TC) ≤ 75°C, per the derating curve in DS39332. At TC = 75°C, junction temperature remains within the 175°C limit assuming RθJC = 1.7°C/W. Operation above this case temperature requires current reduction.

Is GBU25KH suitable for capacitive-input filter applications?

No - the datasheet explicitly states that current must be derated by 20% for capacitive loads due to higher peak currents and increased thermal stress. For such applications, use a higher-rated part like GBU35KH or consider active PFC front-ends to avoid premature failure.

Does GBU25KH meet AEC-Q200 requirements for automotive use?

GBU25KH is manufactured in IATF 16949-certified facilities and supports PPAP, but it is not formally qualified to AEC-Q200. Diodes specifies that automotive-grade variants require explicit change control and separate qualification - contact Diodes directly for AEC-compliant alternatives such as the GBU25KH-A.

How is polarity marked on the GBU25KH package?

Polarity is marked on the body: a white band identifies the cathode common (–) terminal, while the opposite end is the anode common (+). The two AC input terminals (AC1 and AC2) are unmarked and interchangeable, as confirmed in the mechanical outline and marking diagram in DS39332 Rev. 6–2.