TN22-1500H — 400 V, 2 A RMS standard recovery SCR in TO-251 IPAK
The TN22-1500H is a standard-recovery silicon controlled rectifier (SCR) from STMicroelectronics, rated for 400 V off-state blocking and 2 A RMS on-state current. It comes in a TO-251-3 (IPAK) through-hole package, suited for compact PCB mounting where a tab-heatsink interface is available. Typical applications include AC motor speed controls, lighting dimmers, inrush current limiters, and general-purpose AC switching in industrial and appliance power stages. The -40°C to 110°C operating range covers most indoor and outdoor telecom enclosures, though it stops short of full automotive under-hood temperature.
Package and mounting — TO-251 IPAK
The TO-251 (IPAK) package has three short leads and a metal tab that is electrically common with the middle pin (anode). The tab is designed for soldering to a PCB copper pad or for a small clip-on heatsink. Through-hole mounting keeps it mechanically robust in high-vibration environments like motor drives or pumps. The 100 µA maximum off-state leakage at 400 V is typical for a standard-recovery SCR in this voltage class; no fast-recovery or soft-recovery characteristics are specified.
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