Analog Devices Inc./Maxim Integrated LM4040AIM3-3.0+T

Overview

LM4040AIM3-3.0+T from Maxim Integrated is a precision 3.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, 100ppm/°C max temperature coefficient, and stable operation from 60μA to 15mA shunt current. It serves as a compact, low-noise reference for ADCs, DACs, and power-supply monitoring in space-constrained portable electronics.

For engineers reviewing the LM4040AIM3-3.0+T datasheet, LM4040AIM3-3.0+T pinout, LM4040AIM3-3.0+T application, or LM4040AIM3-3.0+T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, no external capacitor requirement, ultra-low 45µVRMS wideband noise (10Hz–10kHz), and compatibility with capacitive loads in battery-powered systems.

Technical Context

The LM4040AIM3-3.0+T uses laser-trimmed bandgap circuitry to deliver precise reverse-breakdown voltage regulation without series pass elements. Its two-terminal architecture simplifies design by eliminating separate input/output pins - cathode and anode define current flow direction, with pin 3 unconnected.

It operates as a shunt device: reverse current (cathode-to-anode) between 60μA and 15mA maintains 3.000V ±0.3mV (typical) across terminals. Dynamic impedance remains ≤0.8Ω at 1mA, ensuring minimal voltage shift under load transients and enabling stable performance across wide temperature and current ranges.

Key Specifications

Pinout & Package

LM4040AIM3-3.0+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 remain 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, LM4040AIM3-3.0+T delivers superior noise performance (45µVRMS vs. >100µVRMS), true two-terminal simplicity, and lowest quiescent current - making it optimal for fixed-voltage, space- and power-constrained shunt reference designs.

Availability

LM4040AIM3-3.0+T is available at Aetrix Electronics and suitable for portable medical sensors, notebook power monitoring, automotive cabin control units, and industrial process transmitters requiring stable component supply and long-lifecycle support.

Supply support for LM4040AIM3-3.0+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 demanding industrial, automotive, and computing applications.

The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems where stability, low noise, and zero external components are critical.

FAQ

What is the guaranteed operating temperature range for LM4040AIM3-3.0+T?

The LM4040AIM3-3.0+T is specified for operation from -40°C to +85°C. This industrial-grade range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. The "I" suffix in the part number denotes the -40°C to +85°C grade, distinct from the "E" grade rated to +125°C. LM4040AIM3-3.0+T maintains its 0.1% initial accuracy and 100ppm/°C tempco across this full range.

Does LM4040AIM3-3.0+T require an external capacitor for stability?

No, LM4040AIM3-3.0+T does not require an external capacitor for stability. The device is internally compensated and remains stable with any capacitive load, including values up to 1µF or more. This eliminates the need for external components, reduces BOM count, and avoids potential phase-margin issues associated with output capacitance in traditional shunt references.

What is the minimum shunt current required for LM4040AIM3-3.0+T to regulate properly?

The minimum operating shunt current for LM4040AIM3-3.0+T is 60μA, as specified in the Electrical Characteristics table for the 3.000V version. Below this current, the device may not maintain its rated 3.000V output within specification. Designers must ensure the source resistor and load conditions sustain ≥60μA across all operating temperatures and supply variations.

How is pin 3 used on the LM4040AIM3-3.0+T SC70-3 package?

Pin 3 of LM4040AIM3-3.0+T is designated N.C. (No Connection) and must be left unconnected or tied directly to pin 2 (the cathode/anode terminal). It has no internal connection and serves only as a mechanical pad. Connecting pin 3 to any other net - including V_REF or ground - violates the pin configuration and may compromise performance or reliability.

What is the wideband noise specification for LM4040AIM3-3.0+T, and how is it measured?

LM4040AIM3-3.0+T exhibits 45µVRMS wideband noise over the 10Hz to 10kHz frequency range, measured at 100µA shunt current. This value is explicitly listed in the Electrical Characteristics table for the 3.000V variant and reflects total integrated noise contributing to reference uncertainty in precision data converters and analog signal chains.