EC103B1

Overview

The Littelfuse EC103B1 is a sensitive silicon-controlled rectifier (SCR) from the Teccor line, designed as a half-wave unidirectional gate-controlled rectifier. It features a non-isolated TO-92 package with glass-passivated junctions for reliability. The device supports a maximum on-state current of 0.8 A and a repetitive peak off-state voltage of 200 V. Key electrical parameters include a DC gate trigger current of 12 µA, a peak on-state voltage of 1.7 V, and an operating temperature range of -65 °C to +110 °C.

Feature Summary

• Glass-passivated chip construction provides a rugged barrier against junction contamination.
• High sensitivity gate control allows triggering with low current levels.
• Non-isolated TO-92 package offers compact form factor for surface or through-hole mounting.

Applications

• Lighting control circuits
• Motor speed control applications
• General purpose switching

Procurement Notes

Verify the specific ordering suffix to confirm package type and lead configuration. Ensure the procurement documentation matches the required voltage rating and gate sensitivity specifications. Confirm RoHS compliance status if restricted substances are a constraint for the assembly process.

Selection Notes

Select this component when a low-cost, high-sensitivity SCR is required for low-current switching. The 12 µA gate trigger current makes it suitable for microcontroller interfaces. Verify that the 200 V blocking voltage meets the circuit's peak reverse voltage requirements.

Part Context

This part belongs to the EC Series of sensitive SCRs manufactured by Littelfuse under the Teccor brand. The series includes variants with different voltage ratings and gate sensitivities, all sharing similar thermal and mechanical characteristics within the TO-92 footprint.

Replacement Considerations

Direct substitutes include other 0.8 A, 200 V SCRs with comparable gate trigger currents. Check pinout compatibility for TO-92 packages before substitution.