Teccor's alternistor is specifically designed for applications that switch highly inductive loads. It offers better turn-off behavior than a standard triac and can be triggered from either polarity of applied AC voltage.
The Littelfuse E4 Alternistor Triacs are bidirectional thyristor devices designed for switching highly inductive loads. They are available in current ratings from 6 A to 40 A and voltage ratings from 200 V to 1000 V, offering enhanced dv/dt performance and glass‑passivated junctions for reliability.
The devices are offered in several isolated and non‑isolated TO‑220, TO‑218, TO‑218X, TO‑251, TO‑252, TO‑263 and D‑Pak packages, each with a standard isolation voltage of 2500 V rms. Detailed electrical specifications, thermal resistance data, and test conditions are provided for design engineers.
| Current rating | 6 A – 40 A |
|---|---|
| Voltage rating | 200 V – 1000 V |
| Isolation voltage (isolated packages) | 2500 V rms |
| Gate trigger current (6 A‑12 A devices) | 200 mA |
| Operating temperature range | -40 °C to +125 °C |
The gate trigger current (I GT) is 200 mA for 6 A to 12 A devices.
Isolated packages have a standard isolation voltage rating of 2500 V rms.
They operate from –40 °C up to +125 °C.