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Texas Instruments LM4040C30QDBZT — Analog & Data Acquisition

LM4040C30QDBZT Shunt Voltage Reference, 3 V ±0.5%, SOT-23-3

MPNLM4040C30QDBZT
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Texas Instruments LM4040C30QDBZT precision shunt voltage reference, fixed 3 V output, ±0.5% tolerance, 35 µVrms noise, 100 ppm/°C drift, SOT-23-3 package, -40°C to 125°C.

$1.8900Ref. price · indicative, final on quote
PackagingTO-236-3, SC-59, SOT-23-3
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM4040C30QDBZT specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))3V
Output current15 mA
Current - cathode82 µA
Operating temperature-40°C~125°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±0.5%
CaseTO-236-3, SC-59, SOT-23-3
Noise - 10Hz to 10kHz35µVrms
Temperature coefficient100ppm/°C

Product details

The shunt topology means it behaves like a two-terminal Zener — you bias it with a series resistor from a higher supply rail, and the reference regulates by shunting current through the cathode.

Package and rework — SOT-23-3 under the hot air

The LM4040C30QDBZT comes in a SOT-23-3 package, which is about as rework-friendly as a three-pin part gets. The body is small, so it heats up fast under a hot-air station — a 300°C nozzle at moderate airflow lifts it clean in about 8 seconds. No thermal pad underneath, so no risk of hidden solder bridges.

Frequently asked questions

What is the tolerance of LM4040C30QDBZT?

The tolerance is ±0.5%, which is a mid-grade precision level — tighter than the 1% versions but not the premium 0.1% grade. For a 3 V reference, that means the output is guaranteed within 15 mV of nominal at 25°C.