TLV431BCPK

Overview

The TLV431BCPK is a low-voltage adjustable precision shunt regulator manufactured by Texas Instruments. It features an internal reference voltage of 1.24 V with an initial accuracy of ±0.5%. The device supports an adjustable output voltage range from 1.24 V to 6 V and operates within a temperature range of -40°C to +125°C. Key electrical parameters include a maximum cathode current of 15 mA, a minimum operating cathode current of 80 µA, and a typical dynamic impedance of 0.25 Ω. It is housed in a SC-70 (SOT-363) surface-mount package.

Feature Summary

• Provides precise voltage regulation with a 1.24 V internal reference for high accuracy applications
• Operates at low voltages, making it suitable for battery-powered and portable devices
• Features a compact SC-70 package that reduces board space requirements compared to traditional SOT-23 packages

Applications

• Isolated feedback circuits in 3 V to 3.3 V switch-mode power supplies
• Portable equipment requiring low-power voltage references
• Battery chargers and power management systems

Procurement Notes

Verify the specific suffix 'B' confirms the 0.5% initial accuracy tolerance required for your design. Confirm the SC-70 package dimensions match your PCB footprint. Check for moisture sensitivity levels if reflow soldering is planned. Ensure the 15 mA cathode current limit meets the load requirements of your circuit.

Selection Notes

Select this component when a low-voltage, high-precision reference is needed in a minimal footprint. It serves as a direct replacement for standard TL431 devices in low-voltage applications where the higher 2.5 V reference of the TL431 is unsuitable. Consider the 80 µA minimum cathode current requirement to ensure stable operation at light loads.

Part Context

This part belongs to the TLV431 family of low-voltage adjustable precision shunt regulators. Unlike the standard TL431 which uses a 2.5 V reference, the TLV431 utilizes a 1.24 V reference, enabling operation in lower voltage domains. The 'B' designation indicates a tighter initial accuracy tolerance compared to the standard or 'A' grade variants.

Replacement Considerations

The TLV431BCDR is a pin-compatible alternative in the same SC-70 package. For through-hole applications, the TLV431BLPR in TO-92-3 may be considered. Standard TL431 devices are not direct replacements due to the different reference voltage and operating voltage ranges.