Skip to main content
Log in
Texas Instruments LM4041BIM3X-1.2 — Analog & Data Acquisition

LM4041BIM3X-1.2 Shunt Voltage Reference, 1.225V ±0.2%

MPNLM4041BIM3X-1.2
Obsolete

Texas Instruments LM4041BIM3X-1.2, precision shunt voltage reference, fixed 1.225V output, ±0.2% tolerance, 100ppm/°C drift, 20µVrms noise, SOT-23-3 package, -40°C to 85°C.

$0.7200Ref. price · indicative, final on quote
Texas Instruments LM4041BIM3X-1.2 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4041BIM3X-1.2 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))1.225V
Output current12 mA
Current - cathode65 µA
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±0.2%
CaseTO-236-3, SC-59, SOT-23-3
Noise - 10Hz to 10kHz20µVrms
Temperature coefficient100ppm/°C

Product details

Obsolete — sourcing this precision shunt reference

This is a shunt (two-terminal) voltage reference with a fixed 1.225V output. The 20µVrms noise over 10Hz to 10kHz keeps the reference clean for low-frequency measurement.

Biasing the shunt — cathode current and load limits

A shunt reference needs a bias resistor from the supply to the cathode. The minimum cathode current is 65 µA; the maximum output current is 12 mA. The resistor must supply both the load current and the cathode current, keeping the cathode current between 65 µA and 12 mA over all conditions. In a 3.3V circuit, a 1.6 kΩ resistor biases the reference at about 1.3 mA — well within range.

SOT-23-3 package — footprint and rework

The LM4041BIM3X-1.2 comes in a standard SOT-23-3 package (TO-236-3 / SC-59 compatible). Surface-mount only. The three-pin layout is straightforward: cathode, anode, and no-connect. For rework, a standard hot-air profile at 260°C peak works — no moisture sensitivity concern beyond the standard MSL1 bake if the tape has been exposed.

Frequently asked questions

Is LM4041BIM3X-1.2 obsolete?

Yes, the LM4041BIM3X-1.2 is listed as obsolete by Texas Instruments. No direct replacement is officially designated.

Can LM4041BIM3X-1.2 be used as a 1.2V reference?

Yes. The fixed output is 1.225V, which is the standard 1.2V-class reference voltage. The ±0.2% tolerance means the output is between 1.222V and 1.228V at 25°C.