Product Overview
Glass Passivated Bridge Rectifier 200V 8A - GBU Through-Hole, Full-Wave AC/DC
Condition
Unused NOS. Molded body markings legible: GBU8D, GT TAIWAN, 9512. Polarity designations (+, -, ~, ~) stamped on body. Sourced from an electronics distributor consolidating inventory.
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Product Overview
General Instruments GBU8D - glass passivated single-phase bridge rectifier in the 4-pin through-hole GBU package. Rated 200V repetitive peak reverse voltage and 8.0A average rectified forward current (with heatsink at Tc = 100°C). Converts AC to DC in full-wave bridge configuration. Polarity symbols molded on body; integral mounting hole for heatsink attachment. Marked with the original General Instruments logo.
Key Features
- Maximum repetitive peak reverse voltage (VRRM): 200V
- Average rectified forward current (Io): 8.0A with heatsink at Tc = 100°C
- Peak forward surge current (IFSM): 175A (8.3ms single half sine-wave)
- Maximum forward voltage drop (VF): 1.0V per diode at 8.0A
- Operating temperature range: -55°C to +150°C
- Package: GBU / 4-pin through-hole SIP
- Glass passivated junction construction
- Integral mounting hole; polarity symbols stamped on body
Applications
- Repair technician desolders a failed bridge rectifier from a vintage monitor or audio amplifier power supply board and drops this GBU8D in as a direct replacement - same footprint, same specs, original-brand silicon
- Hobbyist restoring a classic switching-mode power supply pulls the blown bridge, checks the 200V/8A rating against the schematic, and solders this in to bring the unit back to spec
- Small-scale fabricator integrating AC/DC rectification into a custom power supply PCB, mounting the GBU package through-hole and attaching a heatsink for sustained current draw
- Maker building a bench power supply or battery charger project that needs a reliable full-wave bridge without the footprint constraints of surface-mount alternatives
Frequently Asked Questions
Is a heatsink required?
A heatsink is required to reach the rated 8.0A continuous output current. The 8.0A figure is specified at a case temperature of 100°C, which assumes adequate thermal management. At lower currents or in well-ventilated enclosures, the thermal requirement is reduced - but for sustained high-current operation, mount it to a heatsink using the integral mounting hole.
Is this compatible with surface-mount PCB assembly?
No. The GBU8D is a 4-pin through-hole SIP package. It is not compatible with surface-mount (SMT) processes or SMT PCB layouts.
What is the difference between the GBU8D and other GBU8 variants?
The GBU8 series shares the same 8A current rating and GBU package. The suffix letter identifies the voltage rating: GBU8D is 200V. Other variants in the series cover 50V (GBU8A), 100V (GBU8B), 400V (GBU8G), 600V (GBU8J), 800V (GBU8K), and 1000V (GBU8M). Match the suffix to your circuit's peak reverse voltage requirement.
What are the AC input terminals, and how do I identify polarity?
The GBU8D has four pins: two AC input terminals (marked ~), one DC positive output (+), and one DC negative output (-). All four designations are stamped on the body of this unit.
Old-school silicon from the General Instruments era, still in the wrapper, still ready to work. Whatever power supply brought you here, this is the part that sends it back into service.
