Analog Devices Inc./Maxim Integrated LM4040BEM3-5.0+T

Overview

LM4040BEM3-5.0+T from Maxim Integrated is a precision 5.000V, two-terminal shunt voltage reference in SC70-3 package with ±0.2% initial accuracy, 100ppm/°C max temperature coefficient, and guaranteed operation from –40°C to +125°C. It delivers stable reverse breakdown voltage across 60μA–15mA shunt current, supports capacitive loads without external stabilization, and serves as a compact, low-noise (80µVRMS) reference in battery-powered instrumentation.

For engineers reviewing the LM4040BEM3-5.0+T datasheet, LM4040BEM3-5.0+T pinout, LM4040BEM3-5.0+T application, or LM4040BEM3-5.0+T equivalent, key selection criteria include its AEC-Q100-qualified extended temperature range, ultra-small SC70 footprint, tight initial tolerance, low dynamic impedance (≤1.1Ω), and absence of required output capacitance.

Technical Context

The LM4040BEM3-5.0+T implements a laser-trimmed bandgap shunt architecture that maintains a fixed 5.000V reverse breakdown voltage under reverse bias. Its internal pass transistor sinks variable current to regulate output voltage across wide supply and load variations, eliminating need for series regulators or op-amp buffers.

It operates without external compensation and remains stable with any capacitive load due to inherent low-output-impedance design and optimized internal frequency response. The device exhibits typical long-term stability of 120ppm over 1000 hours and tolerates forward currents up to 10mA.

Key Specifications

Pinout & Package

LM4040BEM3-5.0+T uses the 3-pin SC70 surface-mount package (outline 21-0075, land pattern 90-0208). Pin 3 is no-connect and must remain unconnected or tied to pin 2 (cathode).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBVR and ADR3450ARJZ-R7, the LM4040BEM3-5.0+T offers superior integration (no external components), smallest footprint, and AEC-Q100 compliance - making it optimal for space-constrained, high-reliability shunt reference roles where fixed 5V output is acceptable.

Availability

LM4040BEM3-5.0+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial data acquisition systems, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040BEM3-5.0+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 designs high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and consumer markets, emphasizing precision, power efficiency, and miniaturization.

The LM4040 product line delivers micropower, high-accuracy shunt voltage references targeting space- and power-sensitive applications such as battery-operated instrumentation and automotive subsystems.

FAQ

What is the maximum shunt current rating for LM4040BEM3-5.0+T?

The absolute maximum reverse current for LM4040BEM3-5.0+T is 20mA, though continuous operation above 15mA is not recommended due to thermal limits. At 15mA and 5.000V, power dissipation reaches 75mW - within the SC70 package's 235mW limit at +70°C ambient, but requires careful thermal design at elevated temperatures.

Can LM4040BEM3-5.0+T be used with a 10µF output capacitor?

Yes - LM4040BEM3-5.0+T is explicitly designed to remain stable with any capacitive load, including 10µF. Unlike many shunt references, it does not require minimum or maximum output capacitance and exhibits no peaking or oscillation regardless of COUT value, simplifying layout and eliminating capacitor-related failure modes.

Is LM4040BEM3-5.0+T qualified for automotive applications?

Yes - LM4040BEM3-5.0+T is AEC-Q100 qualified for Grade 1 (–40°C to +125°C) operation. Its ordering code "E" denotes the extended temperature grade, and the "/V" suffix variants (e.g., LM4040BEM3-5.0/V+T) indicate full automotive qualification with additional stress testing and traceability.

How does the 100ppm/°C temperature coefficient translate to actual voltage drift?

Over the full –40°C to +125°C range (ΔT = 165°C), the worst-case drift for LM4040BEM3-5.0+T is 5.000V × 100ppm/°C × 165°C = ±82.5mV. Combined with its ±10mV initial tolerance, total output variation remains within ±92.5mV (±1.85%) - verified in production test data and confirmed by typical operating characteristics curves.

What is the purpose of pin 3 (N.C.) on LM4040BEM3-5.0+T?

Pin 3 is a no-connect terminal with no internal bond wire. It must either be left unconnected or tied directly to pin 2 (cathode) to avoid floating node effects. This design eliminates parasitic capacitance and leakage paths that could degrade long-term stability or noise performance - a critical feature for precision reference applications.