Precision shunt reference in a small SOT-23-3 footprint
The TL4050B10IDBZT is a 10V shunt voltage reference from Texas Instruments, delivering a fixed output with ±0.2% initial tolerance and a 50ppm/°C temperature coefficient. The shunt architecture means it operates as a two-terminal device — the load and bias resistor share the same node — simplifying the BOM for precision bias and ADC reference generation in mixed-signal designs. Rated for continuous cathode current up to 15 mA with a minimum 103 µA bias current, this part suits applications where a stable 10V rail is needed without a dedicated series regulator. The output noise is 150 µVrms over the 10 Hz to 10 kHz band, which keeps the reference clean for a 10-bit or 12-bit ADC reference path.
Package and integration constraints
Supplied in a TO-236-3 / SC-59 / SOT-23-3 surface-mount package (supplier device package SOT-23-3), the device occupies minimal board area. The three-pin footprint — cathode, anode, and no-connect — requires no external compensation capacitor, though a local bypass from cathode to ground reduces noise injection from the supply rail. The shunt reference's inherent simplicity eliminates the dropout voltage concern of a series reference — the only requirement is that the bias resistor delivers enough current to keep the device above 103 µA under all load conditions.
The device is RoHS3 compliant, meeting the current restriction-of-hazardous-substances directive for lead-free soldering processes. Because the part is a shunt reference, it has no direct pin-compatible second source from another manufacturer — the SOT-23-3 footprint is standard, but the specific 10V ±0.2% grade is TI's own.