Automotive-grade 4.096 V reference for precision bias and ADC rails
The LM4128DQ1MF4.1/NOPB is a series voltage reference from Texas Instruments, part of the Automotive, AEC-Q100 family. It delivers a fixed 4.096 V output with ±1% initial tolerance — a common bias voltage for 12-bit and 16-bit ADC reference inputs in engine-control and battery-management modules. Output current is rated 20 mA, enough to drive the reference input of multiple converters or a small sensor bridge.
Noise, drift, and thermal range
For a 4.096 V reference, that drift adds up to about 0.41 mV over a 100 °C swing — well within the ±1% tolerance budget for most automotive sensor chains. Operating temperature covers -40°C to 125°C (junction), which matches the AEC-Q100 Grade 1 band. That means it is qualified for under-hood or cabin-ambient environments where the PCB sees sustained 105°C.
Housed in an SC-74A / SOT-753 package (also called SOT-23-5), the part is a 5-pin surface-mount device with 0.95 mm pitch. The small footprint fits tight automotive ECU layouts, and the 100 µA quiescent supply current keeps the thermal budget low even in dense boards.