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Texas Instruments LM4040AIM3-2.0/NOPB — Analog & Data Acquisition

LM4040AIM3-2.0/NOPB Shunt Voltage Reference, 2.048 V, ±0.1%

MPNLM4040AIM3-2.0/NOPB
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Texas Instruments LM4040AIM3-2.0/NOPB precision shunt voltage reference, fixed 2.048 V output, ±0.1% tolerance, 35 µVrms noise, SOT-23-3 surface-mount package, -40°C to 85°C operating range.

$2.1600Ref. price · indicative, final on quote
Texas Instruments LM4040AIM3-2.0/NOPB datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4040AIM3-2.0/NOPB specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))2.048V
Output current15 mA
Current - cathode65 µA
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
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 in SOT-23-3

The Texas Instruments LM4040AIM3-2.0/NOPB is a precision shunt voltage reference delivering a fixed 2.048 V output with ±0.1% initial tolerance. It operates as a shunt (two-terminal) reference, meaning it sinks current through an external resistor from the supply rail — the same topology as a Zener diode, but with far tighter accuracy and temperature stability.

Noise floor and cathode current

Output noise is specified at 35 µVrms over the 10 Hz to 10 kHz bandwidth — low enough that it won't dominate the noise budget of a 12-bit or even a 14-bit ADC reference path. The minimum cathode current is 65 µA, and the device can sink up to 15 mA continuous. That 65 µA floor sets the minimum bias current through the external resistor; below it the reference drops out of regulation. The 15 mA ceiling limits the load you can drive directly — for higher current, buffer the output or step up to the LM4040's higher-current siblings.

That means no last-time-buy scramble, no broker premium, and no risk of a forced redesign mid-production run.

Frequently asked questions

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