TL431CDT

Overview

The TL431CDT is an adjustable shunt voltage reference manufactured by STMicroelectronics, housed in a surface-mount SOIC-8 package. It provides an output voltage range from 2.5 V to 36 V, set via two external resistors. The device features an initial accuracy of 2% and operates with a cathode current range of 1 mA to 100 mA. It has a maximum series input voltage of 36 V and a temperature coefficient of 100 PPM/°C. The component functions within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Adjustable output voltage capability between 2.5 V and 36 V using external resistors
• Guaranteed thermal stability across the specified operating temperature range
• Wide cathode current operation ranging from 1 mA to 100 mA

Applications

• Precision voltage regulation in power supply circuits
• Reference voltage source for analog-to-digital converters
• Feedback control loops in switching regulators

Procurement Notes

Verify the specific suffix 'CDT' corresponds to the SOIC-8 package and commercial temperature grade (0°C to +70°C) required for the design. Confirm RoHS compliance status through official documentation before integration. Ensure the ordering quantity matches the reel or cut tape specifications provided by the distributor to avoid packaging discrepancies during assembly.

Selection Notes

Select this component when a precise, adjustable reference is needed in a surface-mount application. The 2% initial accuracy suits general-purpose regulation where tighter tolerances are not critical. Consider the SOIC-8 footprint for PCB layout constraints. Verify that the 36 V maximum input voltage aligns with the system's supply rails and that the 100 mA sink current meets the load requirements.

Part Context

The TL431CDT belongs to the TL431 family of programmable shunt regulators. This series is widely used as a voltage reference and error amplifier in various electronic designs. The CD variant specifically denotes the commercial temperature range and SOIC-8 packaging, distinguishing it from automotive or through-hole versions within the broader product line.

Replacement Considerations

Direct pin-compatible substitutes include other manufacturers' TL431 variants in SOIC-8 packages. Verify that alternative parts match the 2.5 V to 36 V output range, 100 mA current capability, and 2% accuracy specifications to ensure functional equivalence in existing circuits.