Product Overview
Powerex C147PB High-Power Phase Control SCR - TO-65 Stud Mount, Unused NOS
Condition
Unused NOS. Visual inspection confirms the metal-bodied stud-mount SCR is in unissued condition with a yellow adhesive label bearing handwritten notation on the face. No damage, corrosion, or signs of installation observed. Sourced from an electronics distributor consolidating inventory.
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Product Overview
Powerex C147PB is a silicon controlled rectifier (SCR) - a solid-state thyristor designed for high-power, unidirectional switching and phase control. It comes in the TO-65 stud-mount metal package, suited for applications where secure mechanical mounting and heat sinking are required. SCRs of this type turn on with a small gate trigger pulse and remain conducting until anode current drops below the holding current level - making them a standard choice for phase-control circuits in motor drives, heating systems, and power supplies.
Key Features
- Device type: Silicon Controlled Rectifier (SCR), thyristor family
- Package: TO-65 stud-mount metal housing
- Unidirectional conduction - gate-triggered turn-on, current-dropout turn-off
- Designed for phase control and high-power switching applications
- Metal stud base for direct heatsink mounting and thermal dissipation
- Powerex manufacture - industrial-grade discrete power semiconductor
Applications
- Industrial maintenance tech replacing a failed phase-control SCR in a motor drive or heating controller - the TO-65 stud mount drops into the same footprint as the original, getting the machine back online without a redesign.
- OEM engineer integrating a gate-triggered unidirectional switch into a new power supply or AC phase-control board where specific trigger and conduction characteristics govern the design.
- Repair shop technician rebuilding a vintage motor speed controller or power regulator where the original SCR has failed and an exact-package replacement is the fastest path to a working unit.
- Hobbyist or maker building a custom light dimmer, heating control, or AC power regulator circuit that needs a robust stud-mount SCR with genuine industrial provenance.
Frequently Asked Questions
What package is this SCR, and how does it mount?
TO-65 stud-mount metal package. The threaded stud screws directly into a heatsink or chassis, providing both mechanical retention and thermal contact. Standard hardware for TO-65 stud-mount devices applies.
Is this a TRIAC or a bidirectional device?
No. This is an SCR - it conducts current in one direction only. For bidirectional AC control you would need a TRIAC or two SCRs in inverse parallel. If your circuit requires bidirectional switching, this part is not the right choice.
What turns this SCR off once it is conducting?
The gate signal alone cannot turn it off. Once triggered, the device stays on until anode current drops below the holding current level or the main circuit power is removed. Circuit design must account for this behavior.
Does this include a heatsink?
No heatsink is included. High-power SCRs in stud-mount packages require external heatsinking - plan for appropriate thermal management in your installation.
What are the voltage and current ratings?
Conflicting figures appear across available sources and the specifications for this specific unit are not confirmed. Buyers should obtain the Powerex C147PB datasheet and verify ratings match their application before ordering.
There is something satisfying about an SCR that has never fired a single cycle - a TO-65 stud-mount waiting patiently for the circuit that finally puts it to work. This one is ready when you are.
