TLVH431BQDBZRQ1

• Adjustable Shunt Voltage reference, Programmable from 1.24V to 18V
• Up to 80 mA Cathode Current with a 100 uA Minimum Operating Current
• 0.5% Initial Voltage Tolerance
• 129 Ppm/C Temperature Coefficient
• 3-Pin SOT-23 package, 2.92mm by 1.3mm
• Automotive qualified, MSL 1, -40C to 125C Operating Range

The Texas Instruments TLVH431BQDBZRQ1 is an automotive-qualified adjustable shunt voltage reference programmable from 1.24V to 18V, supplied in a 3-pin SOT-23 measuring 2.92mm by 1.3mm. A shunt reference behaves as a programmable Zener: an external resistor divider sets the voltage at which it begins to conduct, so one part number covers a wide range of reference and threshold values. It handles up to 80 mA of cathode current with a 100 uA minimum operating current, 0.5% initial tolerance and a recorded 129 ppm/C temperature coefficient, across a -40C to 125C range. The device is MSL 1 rated, lead-free and RoHS compliant and ships 3000 per tape and reel; note the record also holds a 70 mA output current figure alongside the 80 mA maximum.

Adjustable shunt references are the standard error amplifier and reference in isolated switching power supplies, sitting on the secondary side and driving an optocoupler to close the feedback loop across the isolation barrier. The same part serves as a programmable voltage or current limit, an undervoltage or overvoltage detector, a simple Linear Regulator when paired with a pass transistor, and a battery charge termination threshold. A 1.24V to 18V programming range with 80 mA capability means one part number covers reference duties across an entire product line instead of stocking a fixed reference for every rail. Automotive qualification and the 125C rating place this variant in vehicle power supplies, battery management and body electronics; designs needing tight drift should note the 129 ppm/C coefficient recorded here and confirm the grade actually required.