Hitachi
Hitachi 2SC1922 NPN High Voltage Switching Transistor, TO-3, 800 V
- 9 photos
Never used. The original pack has been opened, or the quantity was split off a full reel or tube. Leads are original and unclipped.
New old stock, open stock on the grading scaleSend the quantity you need. You get a quote back with shipping before anything is charged.
Videos
Filmed on the bench. Sound is stripped from product clips.
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Specifications
| Specification | Value |
|---|---|
| Identification | |
| Part number | 2SC1922 |
| Manufacturer | Hitachi |
| Condition | New old stock, open stock |
| Date code | Not recorded |
| Package | TO-3, two lead metal can with the case as collector |
| Country of origin | Japan |
| Family | 2SC1922 |
| Stock number | MHC9Z4EG |
| Overview | |
| Manufacturer part number | 2SC1922 |
| Manufacturer | Hitachi. Case marked HITACHI 2SC1922 JPN |
| Electrical | |
| Polarity and material | NPN silicon |
| Collector emitter voltage | About 800 V |
| Collector current | About 2.5 A |
| Dissipation | About 50 W |
| Construction | |
| Package | TO-3 metal can. The case is the collector |
| Mounting | Bolt down. Needs an insulating washer on a grounded heatsink |
| Condition | |
| Condition | Vintage old stock. Never installed, never soldered |
| Testing | Sold untested. Ask and the exact piece going in the envelope is metered first |
About this part
Horizontal output is the most brutal job in a television, and this is a part built for it. The stage switches the deflection yoke on and off fifteen thousand times a second, and every time it turns off the collapsing field in the yoke throws a flyback spike far above the supply rail. A device that survives that has to hold off something like eight hundred volts while switching fast enough not to cook itself in the transition.
The 2SC1922 is rated around 800 V collector to emitter, 2.5 A and 50 W, in a TO-3 can where the case is the collector. Bolt it to a heatsink and the heatsink is at collector potential, so it needs an insulating washer and a shouldered bush unless the design intends otherwise. That catches people out every time, and on a part working at these voltages it is not a small mistake.
Beyond televisions, high voltage switching transistors of this class turn up in switch mode supplies, inverters and ignition circuits, which is where most of the remaining demand comes from now that the sets themselves are mostly gone. The case is clearly marked HITACHI 2SC1922 JPN. Ordinary storage scratches and oxidation on the metal, never fitted, sold untested.
Questions about this part
Why does a television transistor need 800 volts?
Because of flyback. The horizontal stage switches the deflection yoke about fifteen thousand times a second, and each time it turns off the collapsing magnetic field throws a spike far above the supply rail. The device has to hold that off while still switching fast enough not to overheat in the transition.
Is the case live?
Yes. On a TO-3 the case is the collector, so anything it bolts to becomes part of the circuit. On a grounded heatsink that means an insulating washer and a shouldered bush. At these voltages getting it wrong is not a small mistake.
What else is it good for?
Switch mode power supplies, inverters and ignition circuits: anywhere a fast high voltage switch is wanted. That is where most demand comes from now, since the televisions these were made for have largely gone.
What condition is the case in?
Ordinary storage scratches and oxidation on the metal, which is normal for a bare TO-3 that has been in a box for decades. The markings are clear. It has never been mounted: there is no witness mark on the seating face and the mounting holes are unmarked.