2.048 V shunt reference with ±0.1% tolerance
The Texas Instruments LM4040A20IDBZRG4 is a precision shunt voltage reference that delivers a fixed 2.048 V output with ±0.1% initial tolerance — tight enough to serve as the reference for a 12-bit ADC without external trimming. Wideband noise is specified at 35 µVrms over 10 Hz to 10 kHz, which keeps the reference contribution well below the LSB of a 12-bit system sampling at moderate rates. The shunt architecture allows the reference to operate from a current source or a resistor from the supply rail, sinking up to 15 mA and requiring a minimum cathode current of 80 µA to maintain regulation.
SOT-23-3 footprint and temperature range
Housed in a SOT-23-3 package (also listed as TO-236-3 / SC-59), the part fits a standard three-pin footprint with 0.95 mm pitch — board space is minimal, and the package is widely second-sourced across the industry.
Standard lead times apply through the independent distribution channel. Because the LM4040 series is a mature, multi-sourced family, pin-compatible alternatives from other manufacturers exist — but the TI part is the original reference designator for many precision analog chains.