Analog Devices Inc./Maxim Integrated LM4040DEM3-4.1+T

Overview

LM4040DEM3-4.1+T from Maxim Integrated is a precision 4.096V two-terminal shunt voltage reference in SC70-3 package, featuring 1.0% initial accuracy, ±150ppm/°C temperature coefficient, and guaranteed operation from –40°C to +125°C. It delivers stable reverse breakdown voltage with 60μA to 15mA shunt current capability and low 1.3Ω dynamic impedance at 1mA, enabling use in high-accuracy ADC/DAC biasing and portable power monitoring circuits.

For engineers reviewing the LM4040DEM3-4.1+T datasheet, LM4040DEM3-4.1+T pinout, LM4040DEM3-4.1+T application, or LM4040DEM3-4.1+T equivalent, key selection criteria include its 4.096V nominal output, SC70-3 footprint compatibility, AEC-Q100-qualified extended temperature range, and absence of required output capacitance - critical for space-constrained industrial sensor nodes and automotive body control modules.

Technical Context

The LM4040DEM3-4.1+T implements a laser-trimmed bandgap shunt architecture that maintains fixed reverse-breakdown voltage across cathode-anode terminals without external components. Its internal pass transistor sinks variable current to regulate output voltage under varying load and supply conditions.

It operates as a two-terminal device with no ground reference needed, requiring only a series source resistor (RS) to set shunt current between 60μA and 15mA. Stability is maintained over full temperature range and with any capacitive load, eliminating need for output capacitor compensation.

Key Specifications

Pinout & Package

LM4040DEM3-4.1+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is unconnected (N.C.) and must remain floating or tied to pin 2 per datasheet requirement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040DEM3-4.1+T uniquely balances AEC-Q100 qualification, ultra-low 60μA operating current, and SC70 size - making it optimal for space- and power-constrained automotive and industrial edge nodes where fixed 4.096V is mandatory.

Availability

LM4040DEM3-4.1+T is available at Aetrix Electronics and suitable for portable data acquisition, automotive body control, and industrial sensor transmitter applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040DEM3-4.1+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated designs high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and consumer markets, with emphasis on precision, power efficiency, and integration.

The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-sensitive, and thermally demanding applications - particularly where fixed-output, capacitor-free stability, and extended temperature operation are essential.

FAQ

What is the exact output voltage tolerance of LM4040DEM3-4.1+T at 25°C?

The LM4040DEM3-4.1+T has a nominal reverse breakdown voltage of 4.096V with ±1.0% initial accuracy at +25°C, corresponding to a guaranteed range of 4.055V to 4.137V. This tolerance is laser-trimmed at wafer test and specified in the Electrical Characteristics table for the D-grade variant under TA = +25°C conditions.

Can LM4040DEM3-4.1+T operate without an external capacitor?

Yes, LM4040DEM3-4.1+T does not require an external output capacitor for stability and remains stable with any capacitive load - including 0pF to ≥1µF. This is confirmed in the Applications Information section and Typical Operating Characteristics (Figure 14–15), which show flat output impedance across frequency with and without 1µF capacitance.

What is the minimum shunt current required for regulation in LM4040DEM3-4.1+T?

The LM4040DEM3-4.1+T requires a minimum shunt current of 73µA at +25°C to maintain regulation, as specified in the Electrical Characteristics table for the 4.096V version under IRMIN (LM4040D grade). At –40°C or +125°C, this increases to 78µA to ensure performance across the full temperature range.

Is LM4040DEM3-4.1+T qualified for automotive applications?

Yes, LM4040DEM3-4.1+T is AEC-Q100 qualified for Grade 1 (–40°C to +125°C) operation, as explicitly stated in the Benefits and Features section and confirmed in the Ordering Information table where "/V" suffix denotes automotive qualification. It meets stress testing requirements for automotive body electronics and infotainment subsystems.

What is the thermal resistance of the SC70-3 package used in LM4040DEM3-4.1+T?

The LM4040DEM3-4.1+T in SC70-3 package has a junction-to-ambient thermal resistance (θJA) of 340.4°C/W on a four-layer board, and 340°C/W on a single-layer board, per JEDEC JESD51-7 methodology. These values are documented in the Package Information section and inform derating calculations for power dissipation above +70°C ambient.