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LM4040AIM3-4.1/NOPB

4.096V precision shunt voltage reference, +/-0.1% accuracy, 100ppm/C, 73uA-15mA, SOT-23-3

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Manufacturer Part：

LM4040AIM3-4.1/NOPB

Package：

SOT-23-3 (2.92 x 1.3 x 0.93 mm)

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Description

Product Overview

The LM4040AIM3-4.1/NOPB from Texas Instruments is a precision micropower shunt voltage reference providing a fixed 4.096V output with +/-0.1% initial accuracy (A grade). It features 100ppm/C temperature coefficient, low 35uVrms noise, and requires no external stabilizing capacitor, in a tiny SOT-23-3 package.

Key Specifications

Manufacturer Texas Instruments
Reference Voltage 4.096V (fixed)
Initial Accuracy +/-0.1% (A grade)
Temperature Coefficient 100 ppm/C (max)
Operating Current Range 73uA ~ 15mA
Output Noise 35uVrms (10Hz-10kHz)
Dynamic Impedance 0.3 ohm (typ)
Package SOT-23-3 (2.92 x 1.3mm)
Operating Temperature -40°C ~ 85°C

Features

  • +/-0.1% initial accuracy (A grade at 25C)
  • 100ppm/C maximum temperature coefficient
  • Low output noise: 35uVrms (10Hz-10kHz)
  • Wide operating current: 73uA to 15mA
  • No external capacitor required for stability
  • Tolerates capacitive loads
  • Ultra-small SOT-23 package
  • Bandgap reference with curvature correction

Applications

  • Data acquisition systems and ADC/DAC references
  • Portable and battery-powered equipment
  • Industrial instrumentation and process control
  • Energy management systems
  • Power supply monitoring and threshold detection

The Texas Instruments LM4040AIM3-4.1/NOPB is a precision micropower shunt voltage reference that provides a stable 4.096V output with +/-0.1% initial accuracy. Designed for space-critical applications, it is available in the compact SOT-23-3 surface-mount package. The device uses laser-trimmed resistors and Zener-zap technology during wafer sort to achieve its high accuracy. Bandgap reference temperature drift curvature correction and low dynamic impedance (0.3 ohm typical) ensure stable output voltage over a wide range of operating temperatures and currents. The LM4040 requires no external stabilizing capacitor while maintaining stability with any capacitive load, simplifying PCB design.

The LM4040 operates as a two-terminal shunt (parallel) voltage reference: 1) Bandgap Core: The internal bandgap reference circuit generates a temperature-compensated voltage using curvature correction techniques. The 4.096V output is derived from the bandgap voltage through laser-trimmed resistive dividers, ensuring +/-0.1% initial accuracy. 2) Shunt Regulation: The device is connected in parallel with the load. A series resistor limits the total current, and the LM4040 shunts excess current to maintain a constant 4.096V across its terminals. Operating current can range from 73uA to 15mA. 3) Stability: The low dynamic impedance of 0.3 ohm at 120Hz ensures the reference voltage remains stable despite variations in load current and supply voltage, without requiring an external bypass capacitor.

Pin Name Type Function
1 NC – No connect (leave floating or tie to pin 2)
2 Cathode Input/Output Positive terminal; connect to supply through series resistor
3 Anode Ground Negative terminal; connect to ground
  • Precision voltage reference for 12-bit and higher ADC/DAC systems
  • Portable and battery-powered data acquisition equipment
  • Industrial process control and instrumentation
  • Power supply voltage monitoring and threshold detection circuits
  • Energy management and smart metering applications
Manufacturer Part Number Package Notes
TI LM4040CIM3-4.1/NOPB SOT-23-3 0.5% accuracy, C grade
TI LM4040AIM3-5.0/NOPB SOT-23-3 5.0V version, A grade
ADI ADR3440ARJZ SOT-23-3 4.096V, 0.1%, 8ppm/C
Maxim MAX6143ASA41+ SOT-23-6 4.096V, 0.05%, 3ppm/C
TI REF3040AIDBZR SOT-23-3 4.096V series reference, 50ppm/C
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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