2.048 V fixed output with ±0.2% initial accuracy
The LM4040B20IDBZTG4 is a precision shunt voltage reference from Texas Instruments, delivering a fixed 2.048 V output with a ±0.2% initial tolerance. This places it in the B-grade precision tier of the LM4040 family — suitable for applications where the reference voltage directly sets ADC full-scale range or DAC output accuracy without external trimming. The shunt architecture means it operates like a two-terminal Zener: it sinks current from a series resistor connected to a higher supply rail. The cathode current range spans 80 µA minimum to 15 mA maximum, giving flexibility across low-power and higher-drive designs.
Temperature drift and noise floor
In a low-noise signal chain, this noise floor sits below the quantization noise of a typical 12-bit ADC at 2.048 V reference, so it does not become the dominant error source.
SOT-23-3 package and mounting
Housed in the SOT-23-3 package (also designated TO-236-3 / SC-59), this is a three-lead surface-mount device.