K0900E70AP

Overview

The Littelfuse K0900E70AP is a silicon bilateral voltage triggered switch (SIDAC) from the Kxxxzy series, housed in a TO-92 package. It features glass-passivated junctions for ruggedness and operates as an AC circuit-oriented trigger device. The component switches on when the applied voltage exceeds its breakover point, conducting through a negative resistance region until current drops below the holding threshold. Key electrical parameters include a breakover voltage range of 79V to 97V, a repetitive peak off-state voltage of 70V, and an on-state RMS current rating of 1A at 50/60Hz. It supports a peak non-repetitive surge current of 20A (single cycle, 60Hz) and maintains a storage temperature range from -40°C to 150°C.

Feature Summary

• Silicon bilateral voltage triggered switch with glass-passivated junctions
• Designed for AC circuit orientation and high-voltage triggering applications
• Capable of switching through a negative resistance region to low on-state voltage

Applications

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

Procurement Notes

Verify the specific ordering suffix 'E70AP' against the manufacturer's official documentation to confirm the TO-92 package type and Ammo Pack packaging configuration. Ensure that the application requirements align with the 79V to 97V breakover voltage range and the 1A RMS current rating. Confirm compliance with RoHS standards and check for any recent process change notifications or reliability test updates prior to final procurement decisions.

Selection Notes

Select this component when a bidirectional trigger switch with a 79V to 97V breakover voltage is required for AC circuits. The TO-92 package is suitable for through-hole mounting where space allows. Consider the 1A RMS current capability and 20A single-cycle surge rating for energy dumping applications. Ensure the operating junction temperature remains within the specified -40°C to 125°C range during operation.

Part Context

The K0900E70AP belongs to the Littelfuse Kxxxzy series of standard bidirectional SIDACs. This series utilizes silicon technology with glass-passivated junctions to ensure dependability in harsh environments. The part numbering system indicates the voltage rating (090), circuit function (0 for standard), package (E for TO-92), lead form (70), and packaging option (AP for Ammo Pack). These devices are designed to provide reliable overvoltage protection and triggering in various industrial and consumer electronics applications.

Replacement Considerations

Consult the official Littelfuse datasheet for direct cross-reference options within the Kxxxzy series. Verify that any substitute part matches the 79V to 97V breakover voltage range, TO-92 package dimensions, and equivalent current ratings. Ensure compatibility with existing PCB footprints and soldering profiles.