Product Overview
Westinghouse 164-09 Power Transistor - Stud Mount Metal Can, 90V 20A, New and Unused
Condition
New and unused. The photographed piece is held in hand against a plain wood background with no packaging in the shot. The nickel-bright can carries the circled Westinghouse W logo, the part marking that reads 164-0 before it wraps around the curve of the can, and PT stamped underneath. Two flat spade terminals rise from the top, each with a single hole, both straight and free of solder, tinning, or crimp marks. The hex flange and the threaded mounting stud below it are clean, the threads undamaged, with light surface mottling on the plating of the kind that comes from sitting on a shelf rather than from service. Eleven pieces are in stock and the photo shows one representative unit.
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Product Overview
This is a Westinghouse power transistor in a stud mount metal package, marked 164-09 and rated by the original listing at 90V and 20A. The construction is the classic bolt-down arrangement: a sealed round can, a hex flange for a wrench, and a coarse threaded stud that both anchors the device to a heatsink and gives it a direct metal thermal path. Two flat spade terminals with mounting holes come off the top of the can for the remaining connections, sized for ring lugs or fork terminals rather than a PCB. In packages of this style the case and stud typically serve as the collector connection with the two tabs carrying base and emitter, but that pinout is not confirmed on this unit, so ring it out or check a Westinghouse datasheet before wiring. Polarity, gain, and switching characteristics are likewise not confirmed here. What is confirmed is the marking on the metal, the package, and the fact that these are unused pieces off the shelf.
Key Features
- Manufacturer: Westinghouse, circled W logo stamped on the can
- Part marking: 164-09, with PT stamped below the number on the photographed unit
- Rated voltage: 90V per the original listing
- Rated current: 20A per the original listing
- Package: stud mount metal can with hex flange and threaded mounting stud
- Terminals: two flat spade tabs, each with a single mounting hole
- Condition: new and unused, no packaging or mounting hardware supplied
- Stock: 11 pieces on hand, sold individually
- Polarity, pinout, gain, and thread size: not confirmed - verify against the datasheet before use
Applications
- Industrial electrician repairing a legacy Westinghouse drive or control cabinet whose output stage still uses stud mount devices
- Motor control technician rebuilding a series pass or chopper bank where the transistors bolt straight through the heatsink
- Restorer working on a vintage power supply or amplifier chassis already drilled and tapped for a stud package
- Bench engineer who wants a bolt-down high current device with a real metal thermal path instead of a plastic tab
Frequently Asked Questions
The photo only shows part of the number. What does the can actually say?
The marking wraps around the curve of the can, so the camera catches the circled W logo and 164-0 before the number rolls out of view, with PT stamped on the line below. The full part number is 164-09 as listed. If your application depends on a suffix beyond that, ask before ordering and we will look at the piece in hand.
Is the stud the collector?
Not confirmed on this unit. Stud mount power transistors of this era usually put the collector on the case and stud with base and emitter on the two spade terminals, but we have not tested these, so identify the pins with a meter or a Westinghouse datasheet before you wire anything to a supply.
Have these been electrically tested?
No. They are listed as new and unused based on physical condition and the absence of any wiring or mounting evidence on the terminals, flange, and threads. We have not put them on a curve tracer.
Does it come with mounting hardware or an insulating kit?
No. You get the transistor exactly as photographed. Nut, washers, mica or pad insulator, thermal compound, and lugs are all on your side of the bench.
I need three of these, not thirty. Can I just buy three?
Yes. Eleven are on the shelf and they sell one at a time, so you can buy the single spare a repair calls for or the exact count a parallel bank needs, instead of paying for a forced lot of ten or fifty and shelving the rest. Shipping is $8 flat rate, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Westinghouse stamped its W on power devices back when a transistor was something you bolted down with a wrench, not something you placed with tweezers. If a hex flange and a threaded stud are what your heatsink is drilled for, this one is ready to torque back into service.
