Analog Devices Inc./Maxim Integrated LM4040AIM3-5.0+T

Overview

LM4040AIM3-5.0+T from Maxim Integrated is a precision 5.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, 100ppm/°C max temperature coefficient, and 60μA–15mA operating current range. It delivers stable reverse-breakdown voltage for analog-to-digital converter (ADC) reference, portable power monitoring, and industrial sensor signal conditioning circuits.

For engineers reviewing the LM4040AIM3-5.0+T datasheet, LM4040AIM3-5.0+T pinout, LM4040AIM3-5.0+T application, or LM4040AIM3-5.0+T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, no external capacitor requirement, low 28μVRMS wideband noise (10Hz–10kHz), and compatibility with capacitive loads in space-constrained designs.

Technical Context

The LM4040AIM3-5.0+T uses bandgap-based shunt regulation to maintain a precise 5.000V output across its cathode-anode terminals when reverse-biased between 60μA and 15mA. Its laser-trimmed internal resistors ensure 0.1% initial accuracy at +25°C, with overtemperature tolerance of ±5.0mV (±0.1%) at -40°C to +85°C.

It exhibits low dynamic impedance (≤0.8Ω at 1mA), minimal voltage change vs. current (≤3.5mV from 1mA to 15mA), and stable performance without output capacitance-enabling direct integration into high-impedance feedback paths and low-power sensor interfaces.

Key Specifications

Pinout & Package

LM4040AIM3-5.0+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 ADR3450ARJZ-R7, LM4040AIM3-5.0+T offers true two-terminal simplicity, guaranteed stability without external components, and optimized performance for fixed 5.0V shunt regulation-making it ideal for compact, low-component-count reference designs where supply headroom is limited.

Availability

LM4040AIM3-5.0+T is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, high-resolution data loggers, and automotive cabin sensor modules requiring stable component supply across production lifecycles.

Supply support for LM4040AIM3-5.0+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, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The LM4040 product line delivers micropower, high-accuracy shunt voltage references for space-constrained systems where stability, low noise, and zero external component count are critical design requirements.

FAQ

What is the guaranteed operating temperature range for LM4040AIM3-5.0+T?

The LM4040AIM3-5.0+T is specified for operation from -40°C to +85°C. This I-grade temperature range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. The device maintains its 0.1% initial accuracy and 100ppm/°C temperature coefficient across this full range, with overtemperature tolerance calculated as ±5.0mV at extremes.

Does LM4040AIM3-5.0+T require an external capacitor for stability?

No, LM4040AIM3-5.0+T does not require an external output capacitor. The datasheet explicitly states "No Output Capacitors Required" and confirms stability with any capacitive load. This is enabled by its internal bandgap architecture and low dynamic impedance (≤0.8Ω), eliminating layout constraints and BOM cost associated with external stabilization components.

What is the minimum and maximum shunt current for reliable regulation of LM4040AIM3-5.0+T?

LM4040AIM3-5.0+T operates reliably between 60μA and 15mA shunt current. The minimum value (60μA) ensures proper turn-on and regulation at low power; exceeding 15mA risks thermal overstress. Absolute maximum reverse current is 20mA, but sustained operation above 15mA is not recommended per the Electrical Characteristics table and Applications Information section.

How does the pinout of LM4040AIM3-5.0+T differ from standard SOT23-3 devices?

LM4040AIM3-5.0+T uses SC70-3 packaging-not SOT23-and has a unique pin 3 (N.C.) that must remain unconnected or tied to pin 2 (anode). Unlike typical 3-pin regulators, pin 3 serves no electrical function. The cathode (pin 1) and anode (pin 2) follow standard shunt reference polarity, but the NC pin prevents accidental misrouting in automated assembly.

Can LM4040AIM3-5.0+T replace LM4040CIM3-5.0+T in an existing design?

Yes, LM4040AIM3-5.0+T can directly replace LM4040CIM3-5.0+T because both share identical SC70-3 package, pinout, and 5.000V nominal output. The key improvement is tighter initial accuracy (0.1% vs. 0.5%), which enhances system-level measurement precision without layout or schematic changes-provided the design accommodates the same thermal and current limits.