S4012DRP

Overview

The Littelfuse S4012DRP is a Silicon Controlled Rectifier (SCR) from the Sxx12x series, designed for surface mount applications in the TO-252-3 package. It features a rated repetitive off-state voltage of 400 V and an RMS on-state current capability of 12 A. The device exhibits a maximum holding current of 40 mA and a non-repetitive peak on-state current of 120 A. Electrical characteristics include a forward voltage drop of 1.6 V, a gate trigger voltage of 1.5 V, and a gate trigger current of 20 mA. The component operates within a temperature range of -40°C to +125°C and maintains a low off-state leakage current of 10 µA at rated voltage.

Feature Summary

• Surface mount construction in a TO-252-3 package for automated PCB assembly
• Sensitive gate triggering with defined voltage and current thresholds
• High thermal stability supporting operation up to 125°C junction temperature
• Robust surge handling capability with 120 A non-repetitive peak current

Applications

• General purpose AC power control circuits
• Lighting dimmer implementations
• Motor speed regulation systems
• Solid state relay inputs

Procurement Notes

Verify the specific ordering suffix DRP confirms the reel packaging format and quantity requirements during acquisition. Confirm RoHS compliance status and REACH SVHC declarations against current regulatory standards before integration. Ensure the supplier provides valid traceability documentation matching the Littelfuse manufacturer part number for quality assurance purposes.

Selection Notes

Select this component when a surface mount SCR with 12 A continuous current rating is required. The 400 V blocking voltage suits standard low-voltage AC applications. Verify that the 20 mA gate trigger current aligns with the driving circuit capabilities. Consider the TO-252-3 thermal dissipation limits relative to the expected duty cycle and ambient conditions.

Part Context

This device belongs to the Littelfuse Sxx12x thyristor family, which offers standardized electrical parameters across various package options. The S4012DRP specifically adapts these specifications for surface mount technology, replacing through-hole variants like the S4012R. This lineage ensures consistent performance characteristics while adapting to modern PCB manufacturing constraints.

Replacement Considerations

The S4012R serves as the through-hole equivalent in the same series but utilizes a TO-220-2 package. Direct substitution requires evaluating footprint compatibility and thermal management differences between the SMD and leaded versions.