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Texas Instruments LM4040EIM3-2.5 — Analog & Data Acquisition

LM4040EIM3-2.5 Shunt Voltage Reference, 2.5V ±2%, SOT-23-3

MPNLM4040EIM3-2.5
Obsolete

Texas Instruments LM4040EIM3-2.5, precision shunt voltage reference, fixed 2.5V output, ±2% tolerance, 70 µA cathode current, 15 mA output, 150 ppm/°C drift, SOT-23-3 package, -40°C to 85°C.

$1.0400Ref. price · indicative, final on quote
Texas Instruments LM4040EIM3-2.5 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4040EIM3-2.5 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))2.5V
Output current15 mA
Current - cathode70 µA
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±2%
CaseTO-236-3, SC-59, SOT-23-3
Noise - 10Hz to 10kHz35µVrms
Temperature coefficient150ppm/°C

Product details

The LM4040EIM3-2.5 is a precision shunt voltage reference from Texas Instruments, delivering a fixed 2.5 V output with ±2% initial tolerance. It operates as a shunt (two-terminal) reference, meaning it sinks current through a cathode resistor from a supply rail to regulate the output voltage — similar in application to a Zener diode but with tighter accuracy and lower drift. The SOT-23-3 package (TO-236-3, SC-59) keeps board footprint small.

Key ratings that drive the design decision

The ±2% tolerance is the accuracy floor for the reference voltage at 25°C — if your ADC or comparator needs better than 50 mV absolute accuracy at 2.5 V, this grade is adequate for many 8- to 10-bit systems.

Frequently asked questions

What is the tolerance of LM4040EIM3-2.5?

The initial tolerance is ±2% at 25°C. This is a standard commercial grade — adequate for general-purpose analog references but not for high-precision 16-bit ADC applications where tighter grades (e.g., ±0.1%) are required.

What is the replacement for LM4040EIM3-2.5?

No official direct replacement is listed in the lifecycle data. The LM4040 family includes many variants with different tolerances, packages, and temperature ranges — a current-production LM4040 with the same 2.5 V output and SOT-23-3 package (e.g., LM4040AIM3-2.5) may be footprint-compatible, but confirm the tolerance and temperature grade against your BOM requirements.