EC103D3

Overview

The Littelfuse EC103D3 is a sensitive gate Silicon Controlled Rectifier (SCR) designed for phase control applications. It features a rated repetitive off-state voltage of 400 V and an RMS on-state current of 800 mA. The device operates within a junction temperature range of -40°C to +110°C and utilizes a TO-92 through-hole package. Key electrical characteristics include a maximum gate trigger voltage of 800 mV, a maximum gate trigger current of 500 µA, and a forward voltage drop of 1.7 V at rated current. The component exhibits a holding current of up to 8 mA and supports non-repetitive peak on-state currents of 16 A or 20 A depending on specific test conditions.

Feature Summary

• Sensitive gate architecture enables triggering with microampere-level currents from sense coils or proximity switches.
• Robust thermal performance supports operation across extended industrial temperature ranges.
• Compact TO-92 form factor facilitates integration into space-constrained circuit designs.

Applications

• Phase control circuits for heating elements
• Motor speed control systems
• Lighting dimmer applications

Procurement Notes

Verify the specific suffix designation when ordering, as variants such as EC103D3RP indicate tape-and-reel packaging while others may be bulk. Confirm the exact gate trigger current specifications required by the design against the manufacturer's datasheet for the specific revision. Ensure compliance with RoHS and REACH requirements relevant to the target market before finalizing procurement.

Selection Notes

Select this component for applications requiring low-gate drive power and reliable switching at moderate voltages. Compare the 400 V rating against system line voltages to ensure adequate margin. Evaluate the 800 mA RMS current capability against load requirements, considering derating factors for ambient temperature. Verify that the TO-92 package thermal resistance meets the heat dissipation needs of the enclosure.

Part Context

The EC103D3 belongs to the EC103xx series of sensitive gate SCRs manufactured by Littelfuse. This series is engineered for unidirectional switching in AC power control circuits. The D3 variant specifically denotes the 400 V blocking voltage class within the family, distinguishing it from lower voltage options like the EC103A3 series.

Replacement Considerations

Cross-reference with Teccor Electronics equivalents in the EC103 series for similar pinouts and ratings. Verify that substitute devices match the 400 V VDRM and 800 mA IT(RMS) specifications. Check gate sensitivity parameters to ensure compatibility with existing drive circuitry.

FAQ

What is the maximum gate trigger current for the EC103D3?

The maximum DC gate trigger current is specified as 500 µA.

Does the EC103D3 support high-temperature operation?

Yes, the device is rated for junction temperatures ranging from -40°C to +110°C.

What is the typical forward voltage drop at rated current?

The forward voltage (Vf) is typically 1.7 V at the rated on-state current.