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Texas Instruments LM4040AIM3-2.5 — Analog & Data Acquisition

LM4040AIM3-2.5 Shunt Voltage Reference, 2.5 V, ±0.1%

MPNLM4040AIM3-2.5
Obsolete

Texas Instruments LM4040 series precision shunt voltage reference, LM4040AIM3-2.5, 2.5 V fixed output, ±0.1% tolerance, 100 ppm/°C tempco, 35 µVrms noise, SOT-23-3 package, -40°C to 85°C.

$2.3100Ref. price · indicative, final on quote
Texas Instruments LM4040AIM3-2.5 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4040AIM3-2.5 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))2.5V
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

Obsolete — sourcing this 2.5 V shunt reference

Precision grade: ±0.1% tolerance at 2.5 V

The A-grade variant holds output voltage to ±0.1% at 2.5 V — a 2.5 mV window. The shunt architecture means it operates like a two-terminal Zener: a series resistor from the supply to the cathode sets the bias current, and the reference regulates the cathode voltage. Minimum cathode current is 65 µA — the resistor must be sized to deliver at least that at the minimum supply voltage and maximum load.

Noise and temperature drift for ADC biasing

Output noise is specified at 35 µVrms over a 10 Hz to 10 kHz bandwidth — clean enough for a 12-bit ADC reference at 2.5 V where 1 LSB at 5 V full-scale is about 1.22 mV. Maximum output current is 15 mA.

SOT-23-3 footprint for board-level integration

Packaged in a three-pin SOT-23-3 (TO-236-3, SC-59 compatible), this is a surface-mount part.

Frequently asked questions

Is LM4040AIM3-2.5 obsolete?

Engineers and buyers need to know if the part is still in production or available for new designs and BOM maintenance.

What is a direct replacement for LM4040AIM3-2.5?

If obsolete or unavailable, finding a pin-compatible or electrically equivalent substitute is critical for avoiding redesign.

Where can I buy LM4040AIM3-2.5 in stock?

Sourcing buyers need immediate stock and authorized distributors to fulfill orders and avoid counterfeit parts.

What is the pinout of LM4040AIM3-2.5?

Design engineers validating fit need to know the pin configuration for PCB layout and schematic design.

What is the price of LM4040AIM3-2.5?

Budgeting and cost comparison are essential for purchasing decisions and BOM cost optimization.

LM4040AIM3-2.5 vs LM4040AIM3-1.2: what are the differences?

Engineers comparing voltage options within the same series to select the right output voltage for their application.