K1500E70

Overview

The Littelfuse K1500E70 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 within a breakover voltage range of 140V to 170V. The device supports a repetitive peak off-state voltage (VDRM) of 90V and an on-state RMS current rating of 1A at 50/60Hz. Key electrical parameters include a dynamic holding current maximum of 150mA, a peak non-repetitive surge current (ITSM) of 20A for a single cycle at 60Hz, and a junction temperature range of -40°C to 125°C.

Feature Summary

• Bilateral switching capability with negative resistance region transition
• Glass-passivated junctions for environmental durability
• RoHS compliant construction

Applications

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

Procurement Notes

Verify the specific suffix E70 corresponds to the TO-92 package type when sourcing. Confirm RoHS compliance status through official Littelfuse documentation or authorized distributors. Ensure the ordering quantity matches the bulk packaging base quantity of 2000 units if reel or bulk procurement is required. Cross-reference the part number against the latest datasheet revision to confirm parameter stability.

Selection Notes

Select the K1500E70 when a breakover voltage between 140V and 170V is required for AC circuit triggering. Ensure the application current does not exceed the 1A RMS limit at the specified junction temperature. Consider the TO-92 thermal resistance characteristics for heat dissipation in free air environments. Verify that the 90V VDRM rating is sufficient for the blocking voltage requirements of the target circuit.

Part Context

This component belongs to the Littelfuse Kxxxzy SIDAC family, which includes various voltage ratings and package options such as DO-15 and DO-214. The 'K' prefix identifies it as a SIDAC, while '150' indicates the nominal voltage class. The 'E' suffix denotes the TO-92 package, and '70' specifies the lead form geometry. This series is designed for high-voltage triggering applications requiring reliable bidirectional switching.

Replacement Considerations

Other parts in the Kxxxzy series with different voltage ratings (e.g., K1400E70, K1800E70) may serve as substitutes if the trigger voltage aligns with system requirements. Equivalent SIDACs from other manufacturers must match the 140-170V breakover range, 1A RMS current, and TO-92 package dimensions.