Analog Devices Inc./Maxim Integrated LM4040AIX3-5.0+T

Overview

LM4040AIX3-5.0+T from Maxim Integrated is a precision 5.000V, 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 +85°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 (28μVRMS) reference in space-constrained analog signal chains.

For engineers reviewing the LM4040AIX3-5.0+T datasheet, LM4040AIX3-5.0+T pinout, LM4040AIX3-5.0+T application, or LM4040AIX3-5.0+T equivalent, key selection criteria include its fixed 5.000V output, ultra-small SC70 footprint, A-grade accuracy, wide operating current range, and absence of required output capacitance-critical for portable power management and high-density ADC/DAC reference design.

Technical Context

The LM4040AIX3-5.0+T implements a laser-trimmed bandgap architecture to achieve precise 5.000V reverse breakdown with ±5.0mV (±0.1%) tolerance at +25°C and ±38mV overtemperature. Its dynamic impedance is ≤0.8Ω at 1mA, enabling tight regulation under load transients up to 10mA step changes.

Designed for shunt-mode operation, it requires no forward-biasing and tolerates any output capacitance while maintaining stability. The NC pin (Pin 3) must be left unconnected or tied to cathode (Pin 2), enforcing strict two-terminal functional behavior despite its three-pin SC70 package.

Key Specifications

Pinout & Package

LM4040AIX3-5.0+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is No Connection (NC) and must be left floating or tied to Pin 2 per datasheet requirement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431AIDBZR and ADR3450ARJZ-R7, LM4040AIX3-5.0+T offers the smallest footprint, lowest noise, and true zero-capacitance operation-making it optimal for size- and power-constrained shunt reference roles where fixed 5.000V is required.

Availability

LM4040AIX3-5.0+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, automotive cabin controls, and wireless sensor nodes requiring stable component supply with guaranteed long-term continuity.

Supply support for LM4040AIX3-5.0+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 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 where fixed-output precision and minimal external components are essential.

FAQ

What is the exact output voltage tolerance of LM4040AIX3-5.0+T at room temperature?

The LM4040AIX3-5.0+T has a reverse breakdown voltage of 5.000V ±5.0mV (±0.1%) at +25°C, as specified in the Electrical Characteristics table for the A-grade 5.000V variant. This tolerance is guaranteed by laser trimming and applies to all units shipped under this part number.

Can LM4040AIX3-5.0+T operate without an output capacitor?

Yes, LM4040AIX3-5.0+T does not require an external output capacitor and remains stable with any capacitive load-including zero capacitance. This eliminates BOM cost and layout sensitivity, making LM4040AIX3-5.0+T ideal for ultra-compact and low-power designs where capacitor placement is impractical.

What is the function of Pin 3 on LM4040AIX3-5.0+T?

Pin 3 of LM4040AIX3-5.0+T is designated N.C. (No Connection) and must either be left unconnected or tied directly to Pin 2 (cathode). It is not internally bonded; connecting it to any other node violates the datasheet specification and may degrade accuracy or stability.

Is LM4040AIX3-5.0+T qualified for automotive applications?

LM4040AIX3-5.0+T itself is rated for –40°C to +85°C and is not AEC-Q100 qualified. However, the /V automotive-grade variants (e.g., LM4040AEX3-5.0/V+T) are explicitly AEC-Q100 qualified and operate from –40°C to +125°C. For automotive use, select the /V suffix version instead of LM4040AIX3-5.0+T.

What is the minimum shunt current required for LM4040AIX3-5.0+T to regulate properly?

The LM4040AIX3-5.0+T requires a minimum shunt current of 60μA to maintain regulation within specification. Below this threshold, output voltage deviates significantly; the datasheet specifies IRMIN = 60μA for A-grade 5.000V devices in SC70 package at full temperature range.