Analog Devices Inc./Maxim Integrated LM4040DEM3-5.0+T

Overview

LM4040DEM3-5.0+T from Maxim Integrated is a precision 5.000V 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 1.5Ω dynamic impedance, ideal for high-reliability power-supply monitoring in automotive ECUs.

For engineers reviewing the LM4040DEM3-5.0+T datasheet, LM4040DEM3-5.0+T pinout, LM4040DEM3-5.0+T application, or LM4040DEM3-5.0+T equivalent, key selection criteria include its AEC-Q100-qualified extended temperature range, no-output-capacitor requirement, ultra-small 1.8mm × 1.8mm footprint, and compatibility with capacitive loads in space-constrained embedded systems.

Technical Context

The LM4040DEM3-5.0+T implements a bandgap-based shunt reference architecture that maintains a fixed 5.000V reverse breakdown voltage across its terminals when biased with 60μA–15mA cathode-to-anode current. Its laser-trimmed resistor network ensures factory-calibrated accuracy without external components.

Unlike series references, it operates as a two-terminal device requiring only a source resistor (RS) to set operating current-enabling simple integration into high-voltage supply rails. Stability is maintained over full temperature and current ranges without external capacitors, even under varying capacitive load conditions.

Key Specifications

Pinout & Package

LM4040DEM3-5.0+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), RoHS-compliant and tape-and-reel packaged. Pin 3 is internally unconnected and must be left floating or tied to pin 2 per datasheet directive.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C50IDBZR and MAX6008AEUR+T, the LM4040DEM3-5.0+T trades initial accuracy and tempco for AEC-Q100 qualification and wider shunt current range-making it uniquely suited for automotive and harsh-environment industrial designs where reliability outweighs marginal spec improvements.

Availability

LM4040DEM3-5.0+T is available at Aetrix Electronics and suitable for automotive ECU development, industrial PLC analog input modules, portable medical instrumentation, and smart energy metering systems requiring stable component supply across extended temperature and lifecycle demands.

Supply support for LM4040DEM3-5.0+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 (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, high-reliability systems requiring stable reference voltages without external capacitors or complex bias networks.

FAQ

What is the maximum junction temperature rating for the LM4040DEM3-5.0+T?

The LM4040DEM3-5.0+T has a maximum junction temperature of +150°C. Its extended operating temperature range is –40°C to +125°C ambient, and thermal derating begins above +70°C at 2.90mW/°C for the SC70-3 package. At 15mA shunt current and 5.000V output, power dissipation reaches 75mW-requiring careful thermal design in high-ambient environments to avoid exceeding the +150°C junction limit.

Does the LM4040DEM3-5.0+T require an external capacitor for stability?

No, the LM4040DEM3-5.0+T does not require an external output capacitor for stability. It is designed to remain stable with any capacitive load-including PCB trace capacitance and downstream filter capacitors-eliminating the need for additional components and simplifying layout in compact designs.

What is the function of pin 3 on the LM4040DEM3-5.0+T?

Pin 3 on the LM4040DEM3-5.0+T is labeled N.C. (No Connection) and is internally unconnected. The datasheet explicitly requires this pin to be left unconnected or tied directly to pin 2 (anode). Driving, loading, or routing signals to pin 3 may compromise device performance or reliability.

How does the LM4040DEM3-5.0+T achieve its 1.0% initial accuracy?

The LM4040DEM3-5.0+T achieves its ±1.0% initial accuracy through factory laser trimming of internal resistors during wafer sort testing. This process calibrates the bandgap reference core at +25°C, ensuring the 5.000V reverse breakdown voltage falls within ±50mV of nominal before shipment-no user calibration required.

Is the LM4040DEM3-5.0+T qualified for automotive applications?

Yes, the LM4040DEM3-5.0+T is AEC-Q100 qualified for automotive applications. Its "E" grade designation indicates guaranteed operation from –40°C to +125°C, and it meets stress-test requirements for temperature cycling, humidity, and mechanical shock-making it suitable for engine control, body electronics, and ADAS subsystems.