K2500EH70RP3

Overview

The Littelfuse K2500EH70RP3 is a high-voltage trigger diode, classified as a SIDAC within the thyristor family. It features a bidirectional breakdown characteristic with a nominal voltage rating of 250V and a specific breakover voltage range of 240V to 280V. The device supports a maximum repetitive off-state voltage of 200V and maintains a low leakage current of 5µA under rated conditions. It is housed in a TO-92 through-hole package, suitable for compact circuit designs. The component operates reliably across an extended temperature range from -40°C to +125°C junction temperature, ensuring stability in demanding environments.

Feature Summary

• Bidirectional switching capability for symmetrical AC signal triggering
• High energy handling with non-repetitive peak on-state current up to 20A
• Robust thermal performance supporting junction temperatures up to 125°C

Applications

• Triggering silicon-controlled rectifiers (SCRs) and triacs in power control circuits
• Overvoltage protection stages in industrial equipment
• Pulse generation circuits for ignition systems

Procurement Notes

Verify the exact suffix RP3 against official Littelfuse documentation to confirm packaging specifics, such as reel quantity or tape-and-reel configuration, as standard bulk packaging may differ. Ensure compliance with RoHS and REACH requirements by checking the latest manufacturer certificates. Confirm lead times and availability directly with authorized distributors, as production cycles can vary based on demand and manufacturing schedules.

Selection Notes

Select this component when a precise, symmetric breakover voltage between 240V and 280V is required for triggering applications. The TO-92 package is ideal for through-hole PCB layouts where space allows. Consider the 1A RMS current rating and 20A peak surge capability to ensure the device can handle the expected load currents without damage. Verify that the operating temperature range meets the environmental constraints of the final assembly.

Part Context

The K2500EH70RP3 belongs to the Kxxxzy series of SIDACs manufactured by Littelfuse. This series is designed for high-voltage triggering applications, offering reliable performance in thyristor gate drive circuits. The 'EH' designation typically indicates the TO-92 package variant, distinguishing it from other form factors like DO-15 used in similar voltage-rated parts within the broader product line.

Replacement Considerations

Direct substitutes include the K2500EH70 and K2500G variants, provided the package type matches the design constraints. The K2500GHU offers similar electrical characteristics but utilizes a DO-15 package, requiring footprint adaptation. Always verify pinout compatibility and thermal dissipation requirements before substituting.