K1050E70AP

Overview

The Littelfuse K1050E70AP is a silicon bilateral voltage-triggered switch (SIDAC) from the Kxxxzy series, housed in a TO-92 package. It features a breakover voltage range of 95V to 113V 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 limit of 125°C. Key electrical parameters include a dynamic holding current of 10mA to 150mA, a peak non-repetitive surge current of 20A at 60Hz, and a critical rate of rise of off-state voltage of 1500 V/μs. Thermal resistance from junction to case is 35 °C/W.

Feature Summary

• Utilizes glass-passivated junctions for ruggedness and dependable performance in harsh environments.
• Switches on through a negative resistance region to a low on-state voltage upon exceeding the breakover point.
• Conduction persists until current is interrupted or drops below the minimum holding current threshold.

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 part numbering system. Confirm that the TO-92 lead form matches the Type 70 specification required for the target circuit board layout. Ensure compliance with RoHS directives by checking the official datasheet for material declarations prior to final procurement authorization.

Selection Notes

Select this component when a bidirectional trigger voltage between 95V and 113V is required for AC circuits. The TO-92 package is suitable for through-hole mounting where space allows. Designers must ensure the operating junction temperature remains within -40°C to 125°C limits. Verify that the circuit can sustain the 1A RMS on-state current without exceeding thermal resistance constraints.

Part Context

This device belongs to the Kxxxzy SIDAC family, which offers various breakover voltages ranging from 79V to 330V. The 'K1050' designation specifically indicates the 95V-113V switching range. The 'E' suffix identifies the TO-92 plastic package, while '70' denotes the standard lead form dimensions. This series provides a cost-effective solution for triggering SCRs or TRIACs in lighting and ignition systems.

Replacement Considerations

Direct substitutes within the same voltage class include the K1050G (DO-15 package) and K1050S (DO-214 package). For identical TO-92 packaging but different reel configurations, consider K1050E70RP2 or K1050E70RP3. Cross-package replacements require verification of physical footprint compatibility and thermal dissipation characteristics.