Analog Devices Inc./Maxim Integrated LM4040CIM3-5.0+T

Overview

LM4040CIM3-5.0+T from Maxim Integrated is a precision 5.000V, two-terminal shunt voltage reference in SC70-3 package with ±0.5% 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 LM4040CIM3-5.0+T datasheet, LM4040CIM3-5.0+T pinout, LM4040CIM3-5.0+T application, or LM4040CIM3-5.0+T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, no external capacitor requirement, low 28μVRMS noise (10Hz–10kHz), and compatibility with high-impedance load interfaces in space-constrained designs.

Technical Context

The LM4040CIM3-5.0+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 resistor network ensures tight initial tolerance without external trimming components.

It operates without output capacitance stabilization and tolerates arbitrary capacitive loads while maintaining stability. The device exhibits low dynamic impedance (≤0.9Ω at 1mA) and long-term drift of ≤120ppm over 1000 hours, supporting high-accuracy measurement systems requiring minimal calibration.

Key Specifications

Pinout & Package

LM4040CIM3-5.0+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 unconnected (N.C.) and must be left floating 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 TL431CDBZR and REF3050AIDBZR, the LM4040CIM3-5.0+T offers smallest PCB footprint, lowest minimum operating current, and true two-terminal simplicity-making it optimal for space- and power-constrained shunt reference roles where fixed 5.0V is sufficient.

Availability

LM4040CIM3-5.0+T is available at Aetrix Electronics and suitable for portable power monitoring, industrial sensor signal conditioning, medical vital sign monitors, and automotive cabin environment sensors requiring stable component supply across production lifecycles.

Supply support for LM4040CIM3-5.0+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 designs precision analog and mixed-signal semiconductors for industrial, medical, and communications applications, emphasizing high accuracy, low power, and small form factors.

The LM4040 product line delivers micropower shunt voltage references optimized for space-critical, battery-operated, and high-reliability systems where stable, low-drift reference performance is essential.

FAQ

What is the guaranteed operating temperature range for LM4040CIM3-5.0+T?

The LM4040CIM3-5.0+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 Maxim datasheet. It does not carry the extended -40°C to +125°C rating found on E-grade variants like LM4040CEM3-5.0+T.

Can LM4040CIM3-5.0+T operate without an external capacitor?

Yes, the LM4040CIM3-5.0+T is internally compensated and stable with any capacitive load - including zero output capacitance. This eliminates the need for external bypass or stabilization capacitors, simplifying layout and reducing BOM count in compact designs.

What is the minimum shunt current required for regulation in LM4040CIM3-5.0+T?

The LM4040CIM3-5.0+T requires a minimum shunt current of 60μA to maintain regulation across its full temperature range. This value is specified in the Electrical Characteristics table for the C-grade 5.000V variant and is critical for ensuring stable 5.000V output in ultra-low-power applications.

How does the pin configuration of LM4040CIM3-5.0+T differ from standard 3-pin ICs?

The LM4040CIM3-5.0+T has a two-terminal functional configuration: pin 1 is cathode (+), pin 2 is anode (–), and pin 3 is N.C. (no connection). Pin 3 must remain unconnected or be tied to pin 2 - unlike typical 3-pin ICs, it contributes no electrical function and exists solely for mechanical compatibility with SC70-3 packaging standards.

Is LM4040CIM3-5.0+T RoHS-compliant and lead-free?

Yes, the "+T" suffix in LM4040CIM3-5.0+T explicitly denotes a lead(Pb)-free and RoHS-compliant package, as stated in the Ordering Information footnote. The device meets EU RoHS Directive 2011/65/EU and is suitable for environmentally regulated electronics manufacturing.