Analog Devices Inc./Maxim Integrated LM4040AEM3-3.0+T

Overview

LM4040AEM3-3.0+T from Maxim Integrated is a precision 3.000V, two-terminal shunt voltage reference in SC70-3 package with 0.1% 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 and is used in high-reliability analog signal conditioning and ADC/DAC biasing circuits.

For engineers reviewing the LM4040AEM3-3.0+T datasheet, LM4040AEM3-3.0+T pinout, LM4040AEM3-3.0+T application, or LM4040AEM3-3.0+T equivalent, key selection criteria include its A-grade accuracy, extended temperature range, ultra-small SC70 footprint, low 45µVRMS noise (10Hz–10kHz), and no-output-capacitor stability for space-constrained industrial and automotive systems.

Technical Context

The LM4040AEM3-3.0+T implements a laser-trimmed bandgap reference core with internal pass transistor, operating as a precision shunt device that maintains fixed 3.000V output when reverse-biased between 60μA and 15mA. Its dynamic impedance is ≤0.8Ω at 1mA, enabling tight regulation under varying load and supply conditions.

Designed for high-temperature environments, it features guaranteed performance over –40°C to +125°C, AEC-Q100 qualification for automotive use (per /V variants), and tolerance of any capacitive load without external compensation-eliminating stability concerns in noisy or dynamically loaded systems.

Key Specifications

Pinout & Package

LM4040AEM3-3.0+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is NC and must be left unconnected or tied to pin 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBVR and ADR3430ARJZ-R7, LM4040AEM3-3.0+T offers true fixed 3.000V output with no external components, smallest SC70 footprint, and guaranteed A-grade accuracy over extended temperature-making it optimal for space- and precision-critical shunt reference implementations.

Availability

LM4040AEM3-3.0+T is available at Aetrix Electronics and suitable for industrial process sensors, automotive engine control units, and portable medical devices requiring stable component supply with full traceability and long-lifecycle support.

Supply support for LM4040AEM3-3.0+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 high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets, emphasizing precision, power efficiency, and reliability.

LM4040AEM3-3.0+T belongs to the LM4040 family of micropower shunt voltage references engineered for space-constrained, high-accuracy applications where stability, low noise, and extended temperature operation are critical.

FAQ

What is the exact output voltage tolerance of LM4040AEM3-3.0+T at +25°C?

The LM4040AEM3-3.0+T has a nominal output voltage of 3.000V with a maximum tolerance of ±3.0mV (±0.1%) at +25°C, as specified in the Electrical Characteristics table for the A-grade 3.0V variant. This tight tolerance is achieved via laser trimming and is guaranteed across production lots.

Does LM4040AEM3-3.0+T require an external output capacitor for stability?

No, LM4040AEM3-3.0+T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC reference inputs or op-amp feedback networks-eliminating capacitor-related layout constraints and failure modes.

What is the minimum operating current for LM4040AEM3-3.0+T, and why is it important?

The minimum operating current for LM4040AEM3-3.0+T is 60μA. Maintaining current above this threshold ensures the device remains in regulation and delivers its specified 3.000V output with full accuracy and tempco performance. Below 60μA, output voltage may deviate beyond guaranteed limits.

Can LM4040AEM3-3.0+T be used in automotive applications?

Yes-LM4040AEM3-3.0+T is rated for operation from –40°C to +125°C and shares identical specifications with the AEC-Q100 qualified LM4040AEM3-3.0/V+T variant. While the +T suffix denotes RoHS compliance and tape-and-reel packaging, the underlying die and performance are automotive-grade capable.

How does the noise performance of LM4040AEM3-3.0+T compare to other shunt references?

LM4040AEM3-3.0+T delivers 45µVRMS wideband noise (10Hz–10kHz), lower than most competing shunt references in its class (e.g., TL431: ~100µVRMS). This low noise directly improves effective resolution in precision ADC applications, especially when paired with low-noise instrumentation amplifiers.