Product Overview
General Instruments KBL06 Glass Passivated Bridge Rectifier - 4A 600V Through-Hole, Unused NOS
Condition
Unused NOS. Markings legible: GI KBL06, UL, date code 9136, polarity symbols. Four straight leads, no damage observed. Light surface scuff on face noted; does not affect function. Sourced from an electronics distributor consolidating inventory.
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Product Overview
General Instruments KBL06 - glass passivated single-phase full-wave bridge rectifier in a 4-pin inline through-hole package (KBL-4). Rated 4A average forward output current and 600V maximum repetitive peak reverse voltage. Converts AC to DC in linear and general-purpose power supply circuits. Polarity symbols molded on body for correct installation.
Key Features
- Maximum repetitive peak reverse voltage (VRRM): 600V
- Average rectified forward output current (IO): 4A
- Peak forward surge current (IFSM): 200A (8.3ms single half sine-wave)
- Maximum forward voltage drop (VF): 1.1V per diode at 4A
- Operating temperature range: -50°C to +150°C
- Glass passivated junction construction
- Package: KBL-4, 4-pin inline through-hole (SIP)
- Polarity symbols stamped on body
- UL recognized (file E54214)
- Case dielectric strength: 1500 VRMS
Applications
- Replacing a failed bridge rectifier in a vintage linear power supply - desolder the old part, drop this in, confirm polarity from the body markings, and the supply is back online
- Restoring older consumer audio gear, monitors, or printers where the original KBL06 has failed and an original GI-branded part keeps the build authentic
- Prototyping AC-to-DC rectification stages on through-hole PCBs where the 4-pin inline footprint fits the layout
- Builders adding a regulated DC rail to a workshop project or DIY bench supply using a 120V or 240V transformer secondary
- Hobbyist power supply builds where a full-wave bridge is needed and through-hole assembly is preferred over surface-mount
Frequently Asked Questions
What AC input voltage can the KBL06 handle?
The 600V VRRM rating corresponds to a maximum AC RMS input of 420V. Standard 120V and 240V mains applications are well within range.
Is this a drop-in replacement for other KBL06 parts from different brands?
Yes. The KBL06 is a standardized part number across manufacturers including General Instruments, Vishay, and General Semiconductor. Pin layout, voltage, current, and package dimensions follow the same standard, making this a direct replacement.
Does this include a heat sink?
No heat sink included. For applications running near the 4A maximum, thermal management should be considered to keep junction temperature within the -50°C to +150°C operating range.
Is this suitable for switching power supply (SMPS) applications?
The KBL06 is a standard rectifier optimized for line-frequency (50/60 Hz) AC-to-DC conversion. It is not designed for high-frequency switching stages; those applications typically require fast-recovery or Schottky rectifiers.
There is something satisfying about a GI-marked bridge rectifier from 1991 dropping into the exact spot a failed one left behind - same footprint, same polarity marks, same honest silicon doing the same job it was designed for. Bring the supply back up and hand the machine back over.
