Analog Devices Inc./Maxim Integrated LM4040DEM3-5.0-T

Overview

LM4040DEM3-5.0-T from Maxim Integrated is a precision 5.000V two-terminal shunt voltage reference in SC70-3 package, featuring ±1.0% initial accuracy, 150ppm/°C max temperature coefficient, 60μA–15mA operating current range, and guaranteed operation from –40°C to +125°C. It serves as a stable bandgap reference in space-constrained analog signal chains and power monitoring circuits.

For engineers reviewing the LM4040DEM3-5.0-T datasheet, LM4040DEM3-5.0-T pinout, LM4040DEM3-5.0-T application, or LM4040DEM3-5.0-T equivalent, key selection criteria include reverse breakdown voltage tolerance over temperature, dynamic impedance at low shunt currents, noise performance (80µVRMS), no-output-capacitor stability, and SC70 footprint compatibility with high-density PCB layouts.

Technical Context

The LM4040DEM3-5.0-T uses laser-trimmed resistors and BiCMOS bandgap architecture to achieve precise 5.000V reverse breakdown voltage with minimal drift. Its shunt topology requires only a series resistor for biasing and operates without external stabilization capacitors.

It delivers stable regulation across 60μA–15mA shunt current and maintains ≤1.5mV voltage change from 1mA to 15mA load step, with 0.5Ω typical dynamic impedance at 1mA. The device tolerates any capacitive load and exhibits 120ppm long-term stability after 1000 hours.

Key Specifications

Pinout & Package

LM4040DEM3-5.0-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. 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, LM4040DEM3-5.0-T offers true 2-terminal simplicity, smallest SC70-3 footprint, and lowest system-level BOM count-ideal where board area, passive count, and thermal robustness outweigh need for sub-0.5% accuracy.

Availability

LM4040DEM3-5.0-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC analog inputs, and automotive cabin control units requiring stable component supply with extended temperature qualification.

Supply support for LM4040DEM3-5.0-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 ICs for industrial, automotive, and communications applications, emphasizing high reliability and small-footprint solutions.

The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, wide-temperature applications where 2-terminal simplicity and no-output-capacitor stability are critical design requirements.

FAQ

What is the guaranteed operating temperature range for LM4040DEM3-5.0-T?

The LM4040DEM3-5.0-T is specified for continuous operation from –40°C to +125°C ambient temperature. This "E" grade rating is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet. The device's 150ppm/°C temperature coefficient and 120ppm long-term stability are validated across this full range, making LM4040DEM3-5.0-T suitable for under-hood automotive and industrial control applications where thermal extremes are common.

Does LM4040DEM3-5.0-T require an external output capacitor for stability?

No, LM4040DEM3-5.0-T does not require an external output capacitor and is guaranteed stable with any capacitive load. This is explicitly stated in the General Description and Applications Information sections. The internal bandgap design and low dynamic impedance (0.5–1.5Ω) enable unconditional stability, eliminating capacitor-related BOM cost, layout complexity, and aging concerns-unlike many series references that mandate specific input/output capacitance.

What is the minimum shunt current needed for LM4040DEM3-5.0-T to maintain regulation?

The LM4040DEM3-5.0-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 5.000V variant under "Minimum Operating Current" (IRMIN). At 100μA, typical reverse breakdown voltage is 5.000V with ±50mV tolerance; operation below 60μA risks loss of regulation and increased output impedance.

How does the pinout of LM4040DEM3-5.0-T differ from standard 3-pin SOT23 references?

LM4040DEM3-5.0-T uses a 3-pin SC70 package with pin 1 (+), pin 2 (–), and pin 3 (N.C.). Unlike SOT23 variants, pin 3 has no internal connection and must be left unconnected or tied to pin 2-never driven or loaded. This differs from 3-terminal references like TLVH431, which use all three pins for cathode/anode/reference. The SC70 footprint (1.8mm × 1.8mm) is also 50% smaller than standard SOT23, enabling denser layouts.

What is the wideband noise specification for LM4040DEM3-5.0-T, and how does it impact ADC performance?

The LM4040DEM3-5.0-T specifies 80µVRMS wideband noise over 10Hz–10kHz, measured at 100μA shunt current. This noise level directly contributes to ADC quantization uncertainty: for a 5V full-scale 12-bit ADC (LSB = 1.22mV), the reference noise accounts for ~6.5% of LSB, supporting effective resolution up to ~11.3 bits without additional filtering. For higher-resolution systems, external RC filtering may be added-but the device itself requires no such compensation.