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Texas Instruments LM4040B10IDBZR — Analog & Data Acquisition

TI LM4040B10IDBZR 10V Shunt Reference, ±0.2%, SOT-23-3

MPNLM4040B10IDBZR
Active

Texas Instruments LM4040B10IDBZR, precision shunt voltage reference, fixed 10V output, ±0.2% tolerance, 100ppm/°C, 125 µA cathode current, SOT-23-3, -40°C to 85°C.

$2.5800Ref. price · indicative, final on quote
PackagingTO-236-3, SC-59, SOT-23-3
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM4040B10IDBZR specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))10V
Output current15 mA
Current - cathode125 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 10kHz180µVrms
Temperature coefficient100ppm/°C

Product details

10V fixed shunt reference in SOT-23-3

It delivers a fixed 10V output with an initial tolerance of ±0.2% and a temperature coefficient of 100 ppm/°C over the -40°C to 85°C industrial temperature range. As a shunt reference, it behaves like a precision Zener diode — it requires only a single external resistor to set the bias current, making it a simple, low-component-count solution for generating a stable 10V rail in mixed-signal and power-management circuits.

The ±0.2% tolerance on the 10V output means the reference voltage at 25°C will fall between 9.98V and 10.02V. For a 12-bit ADC with a 10V input range, this contributes roughly 8 LSB of gain error before any temperature drift is factored in. If your design needs tighter than ±0.2% initial accuracy, you would step up to the LM4040A10 variant (typically ±0.1%) or move to a series reference topology. The 100 ppm/°C drift adds another 0.6 mV per degree Celsius of temperature change, so budgeting for system-level calibration or a wider ADC input range is worth considering for precision measurement applications.

Shunt topology — bias current and load limits

The LM4040B10IDBZR operates as a shunt reference, meaning it sinks current from the supply rail through an external resistor to maintain the 10V output. The minimum cathode current is 125 µA, which sets the lower bound for the bias resistor value. The maximum output current is 15 mA, so the total current through the reference (the load current plus the quiescent shunt current) must stay under this ceiling. For a load drawing 10 mA, the bias resistor must be sized to deliver at least 10.125 mA at the minimum supply voltage. The 180 µVrms noise from 10 Hz to 10 kHz is typical for a 10V shunt reference and is acceptable for most 12-bit to 14-bit systems without additional filtering.

SOT-23-3 package — board-level fit

The SOT-23-3 (TO-236-3 / SC-59) package occupies roughly 3 mm × 1.5 mm of board area, with a 1.9 mm pin pitch. It is a standard footprint shared across the LM4040 family, so swapping between voltage options (2.5V, 4.096V, 5V, 10V) requires no layout change.

It is ROHS3 compliant.

Frequently asked questions

Does LM4040B10IDBZR replace LM4040A10IDBZR?

Yes, the LM4040B10IDBZR is a drop-in replacement for the LM4040A10IDBZR in the same SOT-23-3 package. The 'B' grade specifies a ±0.2% initial tolerance, while the 'A' grade is typically ±0.1%. All other specifications — 10V output, shunt topology, 125 µA cathode current, 15 mA output, 100 ppm/°C drift — are identical. If your design requires the tighter ±0.1% tolerance, verify the B-grade ±0.2% still meets your system accuracy budget before substituting.

Can LM4040B10IDBZR be used as a 10V reference?

Yes, the LM4040B10IDBZR is specifically designed as a fixed 10V shunt voltage reference. The 10V output is factory-trimmed to ±0.2% accuracy. It provides a stable 10V rail for biasing ADCs, DACs, comparators, or as a precision voltage source in power supplies and measurement circuits. The shunt topology requires only one external resistor to set the bias current.