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Texas Instruments LM4040EEM3X-2.0 — Analog & Data Acquisition

LM4040EEM3X-2.0 Shunt Voltage Reference, 2.048 V, ±2%

MPNLM4040EEM3X-2.0
Obsolete

Texas Instruments LM4040 series precision shunt voltage reference, fixed 2.048 V output, ±2% tolerance, 15 mA output current, 73 µA cathode current, 35 µVrms noise, –40°C to 125°C, SOT-23-3 package, Tape & Reel.

Texas Instruments LM4040EEM3X-2.0 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4040EEM3X-2.0 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))2.048V
Output current15 mA
Current - cathode73 µA
Operating temperature-40°C~125°C(TA)
PackageTape & Reel (TR)
Tolerance±2%
CaseTO-236-3, SC-59, SOT-23-3
Noise - 10Hz to 10kHz35µVrms
Temperature coefficient150ppm/°C

Product details

2.048 V shunt reference in SOT-23-3

The LM4040EEM3X-2.0 is a precision shunt voltage reference from Texas Instruments that delivers a fixed 2.048 V output with ±2% initial accuracy. It uses a shunt (two-terminal) topology, meaning it regulates by shunting current through the cathode to ground — the load and the bias resistor share the same node. The 73 µA minimum cathode current sets the lower bound for the bias resistor calculation; below that the reference drops out of regulation. Output current is rated to 15 mA.

The temperature coefficient is 150 ppm/°C, which translates to roughly 0.3 mV drift over the full range — acceptable for 8-bit or low-end 12-bit references, but not a match for a 16-bit system without calibration. The SOT-23-3 package (TO-236, SC-59) is a standard three-lead footprint shared across the LM4040 family, so board layout transfers directly if you swap to a different voltage option within the series.

Date-code provenance and lot traceability are verified before shipment.

Frequently asked questions

What is a suitable replacement for LM4040EEM3X-2.0?

No official replacement is listed by the manufacturer. Within the LM4040 family, a pin-compatible option with the same 2.048 V output but a tighter tolerance (e.g., ±0.1% or ±0.5%) may be available — check the LM4040A or LM4040B series. Any replacement must match the SOT-23-3 footprint and the shunt topology; the bias resistor value may need adjustment if the minimum cathode current differs.