S886 3A Silicon Controlled Rectifier
What It Is
The S886-3A is a discrete semiconductor device manufactured by HARRIS, packaged in the standard TO-220 case. Based on its part-numbering (S8xx series) and package style, this is a Silicon Controlled Rectifier (SCR/Thyristor) — a 3-terminal switching device.
What an SCR Does
An SCR is a solid-state switch used to control power to a load. It's a four-layer (PNPN) thyristor with three terminals: an input control terminal (gate), an output terminal (anode), and a terminal common to both (cathode). Once triggered by a small gate current, it "latches" on and conducts current until the main current drops below a holding threshold — making it ideal for power switching and control circuits.
Package Details
| Feature | Spec |
|---|---|
| Package type | TO-220AB (3-lead, with heatsink tab) |
| Pin count | 3 (Gate, Anode, Cathode) |
| Mounting | Through-hole, tab-mountable to heatsink |
| Max power dissipation (typical for TO-220) | ~1W without heatsink; higher with heatsink attached |
Typical Applications
- Motor speed controllers
- Light dimmers
- Power supply switching/regulation
- Overvoltage/crowbar protection circuits
- Relay and industrial control circuits
Package Includes
- 1 × S886-3A SCR/Thyristor (TO-220 package)
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