LM4040DIM3-4.1

The LM4040DIM3-4.1 is a fixed shunt voltage reference (part of TI’s LM4040 family) with a nominal 4.1 V output, in a DIM3 package. It’s a two-terminal device that provides a stable reference voltage with low dynamic impedance for precision analog circuits.
Key points
- Two-terminal fixed reference: simple to use, no amplifiers needed.
- Output: ~4.1 V with tight tolerance and low drift across temperature (typical for precision shunt references).
- Operating method: wired as a shunt between V+ and ground with a resistor from supply to the reference’s cathode. The device conducts a bias current I such that Imin ≤ I ≤ Imax for proper regulation.
- Simple circuit: Vs supplies Vref through a sizing resistor R. I ≈ (Vs − 4.1 V) / R. Choose R to keep I within the device’s recommended current range (tens of µA to a few mA).
- Use cases: ADC/DAC references, precision regulator reference rails, calibration references.
Notes
- Check the datasheet for exact pinout in DIM3 package and the recommended current range, tolerance, and temperature coefficient.
- Add a bypass capacitor if warranted by noise requirements.

Here are the key features of LM4040DIM3-4.1:
- Fixed 4.1 V shunt voltage reference (LM4040 family) in the DIM3 package.
- Compact DIM3 surface-mount package.
- Low dynamic impedance for stable regulation over load/current changes.
- Low-noise reference with good line and load regulation.
- Wide operating current range (supporting micropower to modest drive currents).
- Industrial temperature range (typical -40°C to 125°C) for harsh environments.
- RoHS-compliant.
- Ideal for precision reference needs in ADCs, voltage regulators, and instrumentation.
Note: For exact electrical specs (voltage tolerance, current ranges, dynamic impedance, etc.), please consult the official datasheet.

SOT-23, 3-pin package (SOT-23-3).

- Pin count: 3 pins
- Function: Fixed 4.1V shunt voltage reference (three-terminal precision shunt regulator). It clamps the voltage to 4.1V between its cathode and anode by sinking excess current, providing a stable voltage reference.

- Manufacturer: Texas Instruments (TI).
- What kind of company: American multinational semiconductor company that designs and manufactures analog and mixed-signal integrated circuits and other electronic components.

LM4040DIM3-4.1 is a precision shunt voltage reference (4.1 V nominal). Applications:
- ADC/DAC reference rails in microcontrollers and instrumentation
- Precision biasing and calibration references
- Low-noise reference for sensor front-ends and op-amp circuits
- Simple shunt regulator in single-supply systems
- Battery-powered/portable devices
- Reference for comparators and voltage-sensing circuits

Equivalent products (fixed 4.1V shunt references) include:
- TI LM4040-4.1 family (same device line; DIM3 is packaging variant)
- Analog Devices ADR04 (4.096V shunt reference; close to 4.1V)
- TI LM4050-4.1 (another fixed 4.1V shunt option)
- TL431 with external divider to approximate 4.1V (not pin-for-pin)
Note: pinout, tolerance and thermal specs differ; verify datasheets for a direct substitute.