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Texas Instruments LM4040C20QDBZTG4 — Analog & Data Acquisition

Texas Instruments LM4040C20QDBZTG4 Shunt Reference

MPNLM4040C20QDBZTG4
End of Life

Texas Instruments LM4040C20QDBZTG4, precision shunt voltage reference, fixed 2.048 V output, ±0.5% tolerance, 35 µVrms noise, -40°C to 85°C, SOT-23-3 package, Tape & Reel.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4040C20QDBZTG4 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))2.048V
Output current15 mA
Current - cathode80 µA
Operating temperature-40°C~85°C(TA)
PackageTape & Reel (TR)
Tolerance±0.5%
CaseTO-236-3, SC-59, SOT-23-3
Noise - 10Hz to 10kHz35µVrms
Temperature coefficient100ppm/°C

Product details

Fixed 2.048 V shunt reference in SOT-23-3

The Texas Instruments LM4040C20QDBZTG4 is a precision shunt voltage reference delivering a fixed 2.048 V output with ±0.5% initial tolerance. It operates as a two-terminal shunt device, requiring only a single external resistor to set the bias current, making it a simple drop-in for precision bias or ADC reference applications. The SOT-23-3 package (TO-236-3 / SC-59 compatible) occupies minimal board area and is suited for space-constrained designs in industrial control, instrumentation, and portable equipment.

±0.5% tolerance and 35 µVrms noise floor

Initial tolerance of ±0.5% sets the system accuracy baseline — for a 2.048 V reference, the output stays within 2.037 V to 2.059 V at 25°C. This grade suits 10- to 12-bit ADC references where the reference error is a fraction of the LSB.

Active production, sourced to order

The base product number is LM4040; the full suffix encodes the voltage option (20 = 2.048 V), tolerance grade (C = ±0.5%), and package/reel variant.

Frequently asked questions

What is the tolerance of LM4040C20QDBZTG4?

Initial tolerance is ±0.5%.

Can LM4040C20QDBZTG4 replace LM4040AIM3-2.0?

Both are 2.048 V shunt references in SOT-23-3 from the same LM4040 family. The LM4040C20QDBZTG4 carries a ±0.5% tolerance grade (C), while the LM4040AIM3-2.0 is a different ordering code — confirm the tolerance grade and temperature range of your existing BOM position before substituting.