Diodes Incorporated GBU608

Overview

GBU608 from Diodes Incorporated is a 6.0A standard recovery bridge rectifier with 800V maximum repetitive peak reverse voltage (V_RRM), 1.0V forward voltage drop at 3A, and 5µA maximum reverse leakage current at 25°C. It features glass-passivated die construction, 1500V_RMS case dielectric strength, and is rated for surge currents up to 175A peak - used in AC/DC power supplies for industrial motor drives and HVAC control boards.

For engineers reviewing the GBU608 datasheet, GBU608 pinout, GBU608 application, or GBU608 equivalent, key selection criteria include V_RRM margin for line-voltage transients, thermal resistance (2.2°C/W junction-to-case), I_FSM capability for inrush handling, and UL recognition (E95060) for safety-compliant designs.

Technical Context

This single-phase, full-wave bridge rectifier integrates four silicon diodes in a GBU plastic package with through-hole mounting. It operates across -55°C to +150°C junction temperature and requires heatsinking for sustained 6.0A average output current - derated to ~3.5A without heatsink per Fig. 1.

Its standard recovery characteristic (t_rr not specified but implied by "standard recovery" classification) supports 50/60Hz line-frequency rectification, not high-frequency switching. Junction capacitance is 100pF at 1MHz/4V, confirming suitability for low-noise linear power supply front-ends rather than EMI-sensitive SMPS inputs.

Key Specifications

Pinout & Package

Package: GBU - 4-pin, single-in-line (SIP), through-hole plastic housing with #6 screw mounting provision and 3.7g mass. Dimensions per Diodes package outline GBU (A=22.05mm, B=3.8mm, C=7.65mm, J=17.75mm, L=18.55mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with GBU6K and KBU6K, the GBU608 provides verified UL recognition, full +150°C operation, and documented I_2t = 127A²s - making it the preferred choice for safety-critical, thermally demanding, or automotive-adjacent industrial power supplies.

Availability

GBU608 is available at Aetrix Electronics and suitable for industrial motor drives, HVAC control boards, LED streetlight drivers, and PLC power supplies requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for GBU608 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 belongs to Diodes' standard-recovery bridge rectifier product line, engineered for robustness in AC/DC front-end conversion where reliability under surge, temperature, and safety compliance are prioritized over switching speed.

FAQ

What is the maximum heatsink-less continuous current for GBU608?

Per Figure 1 in DS21226 Rev. 8-2, the GBU608 delivers approximately 3.5A average forward current without heatsink at 25°C ambient. This derates linearly to zero at ~100°C case temperature. For sustained 6.0A operation, a 50mm × 50mm × 1.6mm copper plate heatsink is mandatory per datasheet Note 4.

Does GBU608 support 400VAC three-phase rectification?

No - the GBU608 is a single-phase, full-wave bridge rectifier designed for two-wire AC inputs. Three-phase rectification requires a six-diode configuration (e.g., KBPC3510 or discrete 3-phase modules). Using GBU608 on any phase of a three-phase system would result in incomplete rectification and potential device failure.

Is GBU608 suitable for high-frequency switching applications like PFC or SMPS inputs?

No - GBU608 is a standard recovery rectifier with unspecified reverse recovery time (t_rr). Its design targets 50/60Hz line-frequency operation. For high-frequency applications (>20kHz), fast- or ultrafast-recovery bridges (e.g., GBU6J, GBU6K) with defined t_rr ≤ 250ns are required to minimize switching losses and EMI.

How is polarity marked on the GBU608 package?

Polarity is marked on the body: a white band identifies the DC+ (anode) output terminal. The opposite end is DC–, and the two center pins are AC inputs (non-polarized). Mounting orientation follows standard GBU footprint - leads aligned vertically with DC+ at top-right when viewed from top with marking band visible.