Skip to main content
Log in
Texas Instruments LM4040A20IDBZTG4 — Analog & Data Acquisition

Texas Instruments LM4040A20IDBZTG4 Shunt Reference

MPNLM4040A20IDBZTG4
End of Life

Texas Instruments LM4040A20IDBZTG4, precision shunt voltage reference, 2.048 V fixed output, ±0.1% tolerance, 100 ppm/°C, 35 µVrms noise, SOT-23-3, tape and reel.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4040A20IDBZTG4 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))2.048V
Output current15 mA
Current - cathode80 µA
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR)
Tolerance±0.1%
CaseTO-236-3, SC-59, SOT-23-3
Noise - 10Hz to 10kHz35µVrms
Temperature coefficient100ppm/°C

Product details

2.048 V shunt reference — the precision anchor

The Texas Instruments LM4040A20IDBZTG4 is a precision shunt voltage reference that delivers a fixed 2.048 V output with an initial tolerance of ±0.1% and a temperature coefficient of 100 ppm/°C.

The 35 µVrms noise specification (10 Hz to 10 kHz) is low enough that this reference can feed a 16-bit SAR ADC without an external RC filter in many designs — the noise contribution stays below 1/2 LSB at 2.048 V full scale. The minimum cathode current is 80 µA, which sets the lower bound for the bias resistor: with a 5 V supply and 2.048 V reference, the series resistor must pass at least 80 µA plus the load current. The maximum output current is 15 mA, so the resistor also needs to keep the total current under that ceiling at the highest supply voltage.

For a precision reference that often lands in long-life industrial or instrumentation BOMs, that means no forced redesign cycle in the near term.

Frequently asked questions

Can LM4040A20IDBZTG4 replace LM4040A20IDBZT?

The two parts share the same base product number LM4040 and the same 2.048 V output and ±0.1% tolerance. The difference is the packaging format: the IDBZTG4 suffix indicates Tape & Reel, while the IDBZT suffix typically indicates a different reel quantity or tube. Electrically they are identical, so the IDBZTG4 is a drop-in replacement for the IDBZT in the same SOT-23-3 footprint.