Analog Devices Inc./Maxim Integrated LM4040CEM3-3.0+T

Overview

LM4040CEM3-3.0+T from Maxim Integrated is a precision 3.000V fixed-output shunt voltage reference in SC70-3 package, featuring 0.5% initial accuracy, 100ppm/°C max temperature coefficient, and stable operation from -40°C to +125°C. It delivers 60μA–15mA shunt current capability with low 0.9Ω dynamic impedance and 45μVRMS wideband noise (10Hz–10kHz), ideal for high-accuracy ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LM4040CEM3-3.0+T datasheet, LM4040CEM3-3.0+T pinout, LM4040CEM3-3.0+T application, or LM4040CEM3-3.0+T equivalent, key selection criteria include guaranteed extended-temperature performance, no-output-capacitor stability, micropower operation down to 60μA, and AEC-Q100-compliant variants for automotive use.

Technical Context

The LM4040CEM3-3.0+T uses bandgap-based shunt regulation to maintain a precise 3.000V reverse breakdown voltage across its cathode-anode terminals. Its laser-trimmed resistor network ensures 0.5% initial tolerance at +25°C, with overtemperature drift bounded by ±1.15% across -40°C to +125°C per grade C specifications.

It operates without external stabilization capacitors and tolerates arbitrary capacitive loads due to inherent low output impedance (<0.9Ω at 1mA) and stable frequency response up to 1MHz. The device draws only 60μA minimum shunt current, enabling ultra-low-power systems where supply headroom is constrained.

Key Specifications

Pinout & Package

LM4040CEM3-3.0+T is housed in a RoHS-compliant 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. 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 MAX6003EUR+T, the LM4040CEM3-3.0+T offers optimal balance of SC70 size, 0.5% accuracy, wide 60μA–15mA operating range, and proven stability without external components - making it ideal for cost-sensitive, space-constrained industrial and portable designs.

Availability

LM4040CEM3-3.0+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive cabin controllers, industrial process transmitters, and smart energy meters requiring stable component supply across extended temperature ranges.

Supply support for LM4040CEM3-3.0+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 precision analog and mixed-signal ICs for industrial, automotive, and communications markets, emphasizing high accuracy, low power, and small form factors.

The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-reliability applications demanding stable reference performance across extreme temperatures.

FAQ

What is the guaranteed operating temperature range for LM4040CEM3-3.0+T?

The LM4040CEM3-3.0+T is specified for continuous operation from -40°C to +125°C. This extended temperature range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, making it suitable for under-hood automotive and industrial control applications where ambient conditions exceed commercial-grade limits.

Does LM4040CEM3-3.0+T require an external output capacitor for stability?

No, the LM4040CEM3-3.0+T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including zero capacitance. This is explicitly stated in the General Description and Applications Information sections, eliminating layout constraints and reducing BOM count in space-sensitive designs.

What is the minimum shunt current required for proper regulation of LM4040CEM3-3.0+T?

The LM4040CEM3-3.0+T requires a minimum shunt current of 60μA to maintain regulation, as specified in the Electrical Characteristics table for the 3.000V version. This value is consistent across grades C and E temperature ranges and is critical for ensuring accurate output voltage during low-power or standby operation.

How does the pin configuration of LM4040CEM3-3.0+T differ from standard SOT23 voltage references?

The LM4040CEM3-3.0+T uses a 3-pin SC70 package with pin 1 = Cathode (+), pin 2 = Anode (–), and pin 3 = N.C. Unlike many SOT23 references, pin 3 has no internal connection and must remain unconnected or tied to pin 2 - a requirement clearly shown in the Pin Configuration diagram and Pin Description table to prevent misapplication.

Is LM4040CEM3-3.0+T AEC-Q100 qualified?

The LM4040CEM3-3.0+T itself is not AEC-Q100 qualified, but the LM4040CEM3-3.0/V+T variant is explicitly listed as AEC-Q100 qualified in the Benefits and Features section and Ordering Information table. For automotive applications requiring qualification, the /V suffix version must be selected - the base LM4040CEM3-3.0+T remains suitable for industrial and commercial use.