Analog Devices Inc./Maxim Integrated LM4040DEM3-3.0+T

Overview

LM4040DEM3-3.0+T from Maxim Integrated is a precision 3.000V fixed-output, 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 reference in space-constrained analog signal chains and power monitoring circuits.

For engineers reviewing the LM4040DEM3-3.0+T datasheet, LM4040DEM3-3.0+T pinout, LM4040DEM3-3.0+T application, or LM4040DEM3-3.0+T equivalent, key selection criteria include reverse breakdown voltage tolerance over temperature, dynamic impedance at 1mA, wideband noise (45µVRMS), minimum operating current (67µA), and compatibility with capacitive loads without external stabilization.

Technical Context

The LM4040DEM3-3.0+T uses bandgap-based shunt regulation to maintain a precise 3.000V reverse breakdown voltage across its terminals when biased with 60μA–15mA cathode-to-anode current. Its internal laser-trimmed resistor network ensures grade-D (±1.0%) initial accuracy without requiring external components for stability.

It operates across –40°C to +125°C with guaranteed 150ppm/°C max temperature coefficient and exhibits low 0.3–1.1Ω reverse dynamic impedance (at 1mA, 120Hz). The device tolerates any capacitive load and requires no output capacitor, simplifying layout in battery-powered and automotive systems.

Key Specifications

Pinout & Package

LM4040DEM3-3.0+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 unconnected (N.C.) 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 TLVH431ACDBVR and MAX6003EUR+T, the LM4040DEM3-3.0+T offers guaranteed +125°C operation and fixed-pin simplicity at the trade-off of grade-D accuracy and higher tempco - making it optimal for cost-sensitive, high-temp embedded systems where adjustability or sub-0.5% accuracy is unnecessary.

Availability

LM4040DEM3-3.0+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive cabin control units, industrial process transmitters, and smart energy metering modules requiring stable component supply across extended temperature ranges.

Supply support for LM4040DEM3-3.0+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 designs high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and consumer markets.

The LM4040 product line delivers precision micropower shunt references optimized for space-constrained, battery-operated, and high-reliability systems requiring stable voltage references without external compensation.

FAQ

What is the guaranteed operating temperature range for LM4040DEM3-3.0+T?

The LM4040DEM3-3.0+T is fully specified and guaranteed over –40°C to +125°C ambient temperature. This extended range is confirmed by its "E" grade designation in the ordering code and validated in the Absolute Maximum Ratings and Electrical Characteristics tables of the Maxim datasheet. Operation outside this range may result in parametric degradation or failure.

Does LM4040DEM3-3.0+T require an external capacitor for stability?

No, the LM4040DEM3-3.0+T does not require an external output capacitor and remains stable with any capacitive load. This is explicitly stated in the General Description and Applications Information sections of the datasheet. Its internal design eliminates the need for external stabilization, reducing BOM count and PCB area in compact designs.

What is the minimum shunt current required for proper regulation of LM4040DEM3-3.0+T?

The LM4040DEM3-3.0+T requires a minimum shunt current of 67µA (typical) to maintain regulation, with 60µA specified as the absolute lower limit across temperature. This value is derived from the Electrical Characteristics table for the 3.000V version under Grade D (1.0% accuracy) and must be maintained at all times to ensure output voltage accuracy and stability.

How does the 150ppm/°C temperature coefficient affect LM4040DEM3-3.0+T output voltage over temperature?

With a 3.000V nominal output and 150ppm/°C max tempco, the LM4040DEM3-3.0+T contributes up to ±15mV drift over the full –40°C to +125°C range (ΔT = 165°C). This is additive to the ±30mV initial tolerance, resulting in a worst-case total output variation of ±45mV (±1.5%) - a key constraint for high-accuracy metrology applications.

Can pin 3 of LM4040DEM3-3.0+T be left floating or must it be connected?

Pin 3 of the LM4040DEM3-3.0+T is designated N.C. (no connection) and must either be left unconnected or tied directly to pin 2 (anode). The datasheet explicitly states "PIN 3 MUST BE LEFT UNCONNECTED OR CONNECTED TO PIN 2." Leaving it floating is acceptable and functionally identical to connecting it to pin 2, as it is not internally bonded.