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Texas Instruments LM4051CEM3-1.2/NOPB — Analog & Data Acquisition

LM4051CEM3-1.2/NOPB Shunt Voltage Reference, 1.225V ±0.5%

MPNLM4051CEM3-1.2/NOPB
Obsolete

Texas Instruments LM4051CEM3-1.2/NOPB precision shunt voltage reference, fixed 1.225V output, ±0.5% tolerance, 50ppm/°C tempco, 12 mA output, SOT-23-3, -40°C to 125°C.

Texas Instruments LM4051CEM3-1.2/NOPB datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4051CEM3-1.2/NOPB specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))1.225V
Output current12 mA
Current - cathode65 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 10kHz20µVrms
Temperature coefficient50ppm/°C

Product details

Key ratings for the BOM decision

The fixed 1.225V output eliminates the need for external resistor dividers in a shunt configuration, simplifying the BOM. The ±0.5% tolerance and 50 ppm/°C drift together keep the reference voltage within 1% over temperature — adequate for 8- to 12-bit ADC references and comparator thresholds. Maximum cathode current is 65 µA, which sets the lower bound on the series resistor for a given supply rail.

Housed in a SOT-23-3 package, the LM4051CEM3-1.2/NOPB shares the same three-pin footprint as many other shunt references in the LM4051 family, easing layout reuse.

Frequently asked questions

What is the accuracy of LM4051CEM3-1.2/NOPB?

Initial tolerance is ±0.5%, and the temperature coefficient is 50 ppm/°C.

Can I use LM4051CEM3-1.2/NOPB in a 1.2V reference circuit?

Yes, the fixed 1.225V output is the standard 1.2V-class reference. It is a shunt reference, so it requires an external series resistor from the supply to the cathode pin; the cathode current must be kept above 65 µA for regulation.