K1200E70AP

Overview

The Littelfuse K1200E70AP is a silicon bilateral voltage triggered switch (SIDAC) from the Kxxxzy series, housed in a TO-92 package. It features a breakover/trigger voltage range of 110V to 125V and a repetitive peak off-state voltage of 90V. The device supports an on-state RMS current of 1A at 50/60Hz with a junction temperature below 125°C. Key electrical parameters include a dynamic holding current between 10mA and 150mA, a peak non-repetitive surge current of 20A for a single cycle at 60Hz, and a critical rate of rise of on-state current of 150 A/µs. Thermal resistance from junction to ambient is 95 °C/W.

Feature Summary

• Silicon bilateral voltage triggered switch utilizing glass-passivated junctions for ruggedness
• Switches on through a negative resistance region to a low on-state voltage upon exceeding breakover point
• Conduction continues until current drops below the minimum holding current or is interrupted

Applications

• High voltage power supplies
• Natural gas igniters
• High-pressure Sodium lamps
• Xenon flash ignition

Procurement Notes

Verify the specific ordering suffix 'AP' corresponds to the Ammo Pack packaging configuration as defined in the manufacturer's datasheet. Confirm that the component meets RoHS compliance requirements for the intended application environment. Ensure the selected part number matches the required TO-92 package type and lead form specifications before finalizing procurement orders.

Selection Notes

Select this component based on the required breakover voltage range of 110V to 125V for the specific circuit design. Consider the thermal resistance characteristics and maximum allowable case temperature when designing for high RMS on-state currents. Verify that the repetitive peak off-state voltage rating of 90V aligns with the circuit's operating conditions to prevent unintended triggering.

Part Context

This component belongs to the Littelfuse Kxxxzy Series of Standard Bidirectional SIDACs. The series includes various voltage ratings ranging from 79V to 330V, available in DO-15, DO-214, and TO-92 packages. The K1200E70AP specifically utilizes the TO-92 package with Type 70 lead form, distinguishing it from surface-mount or axial-leaded variants within the same product family.

Replacement Considerations

Compatible substitutes within the Kxxxzy series include K1200G (DO-15), K1200S (DO-214), and other K1200y variants. When replacing, ensure the new part maintains the same breakover voltage range and package dimensions. Verify that the thermal and electrical ratings of the substitute match or exceed the original component's specifications.