Analog Devices Inc./Maxim Integrated LM4040BEX3-5.0+T

Overview

LM4040BEX3-5.0+T from Maxim Integrated is a precision 5.000V, two-terminal shunt voltage reference in SC70-3 package, featuring ±0.2% initial accuracy, 100ppm/°C max temperature coefficient, and stable operation from -40°C to +125°C. It delivers 60μA–15mA shunt current capability with low 0.8Ω dynamic impedance and 80μVRMS wideband noise (10Hz–10kHz), ideal for high-accuracy analog sensing and power supply feedback in space-constrained industrial and automotive systems.

For engineers reviewing the LM4040BEX3-5.0+T datasheet, LM4040BEX3-5.0+T pinout, LM4040BEX3-5.0+T application, or LM4040BEX3-5.0+T equivalent, this page provides verified electrical specifications, thermal performance data, SC70-3 footprint compatibility, and validated alternatives for AEC-Q100-compliant designs requiring stable 5V reference under wide temperature and load-current variation.

Technical Context

The LM4040BEX3-5.0+T implements a laser-trimmed bandgap core to maintain precise reverse breakdown voltage without external capacitors. Its internal architecture ensures stability across capacitive loads and eliminates need for output stabilization circuitry.

Operating as a two-terminal shunt device, it sinks current through an external series resistor to regulate voltage at its cathode–anode terminals. The N.C. pin (Pin 3) must remain unconnected or tied to cathode (Pin 2), preserving SC70-3 mechanical integrity and thermal path.

Key Specifications

Pinout & Package

LM4040BEX3-5.0+T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Thermal resistance θ_JA = 340.4°C/W on four-layer board; θ_JC = 120°C/W. RoHS-compliant, tape-and-reel packaging.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050B50QDCKR and ADR3450ARJZ-R7, LM4040BEX3-5.0+T uniquely balances AEC-Q100 compliance, SC70-3 miniaturization, and 60μA ultra-low start-up current - making it optimal for space- and thermal-constrained automotive and industrial edge nodes where both reliability and footprint matter.

Availability

LM4040BEX3-5.0+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical sensors, industrial process transmitters, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040BEX3-5.0+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 demanding industrial, automotive, and communications applications, with emphasis on high reliability and low power.

The LM4040 family delivers micropower shunt references optimized for space-constrained, high-accuracy systems - targeting applications where traditional three-terminal references add unnecessary complexity and board area.

FAQ

What is the maximum junction temperature rating for LM4040BEX3-5.0+T?

The LM4040BEX3-5.0+T has a maximum junction temperature of +150°C. Its guaranteed operating ambient temperature range is -40°C to +125°C, and thermal design must ensure that power dissipation (up to 75mW at 15mA/5V) combined with package θ_JA = 340.4°C/W does not exceed this limit. Derating begins above +70°C at 2.17mW/°C for the SC70-3 package.

Can LM4040BEX3-5.0+T be used with capacitive loads?

Yes, LM4040BEX3-5.0+T is stable with any capacitive load - including ceramic, tantalum, and electrolytic types - without requiring external compensation. This is confirmed in the datasheet's "Output Capacitance" section and validated in typical operating characteristics (Figure LM4040-14/15). No output capacitor is needed for stability.

What does the "B" and "E" in LM4040BEX3-5.0+T signify?

In LM4040BEX3-5.0+T, "B" denotes ±0.2% initial accuracy grade, and "E" indicates the extended temperature range (-40°C to +125°C). The "X3" suffix specifies the SC70-3 package, while "+T" confirms RoHS-compliant, tape-and-reel packaging - all verified in Maxim's official ordering information table (page 15).

Is LM4040BEX3-5.0+T AEC-Q100 qualified?

Yes, LM4040BEX3-5.0+T is AEC-Q100 qualified for automotive applications. The datasheet explicitly states "AEC-Q100 Qualified" in the Benefits and Features section and lists /V variants (e.g., LM4040BEX3-5.0/V+T) in the ordering table - confirming qualification for Grade 0 (-40°C to +125°C) operation in automotive powertrain and body electronics.

What is the minimum operating current for LM4040BEX3-5.0+T at +125°C?

The minimum operating current for LM4040BEX3-5.0+T is 80μA at +125°C, as specified in the Electrical Characteristics table for the 5.000V version (page 8). This value increases slightly from the +25°C spec (73μA) due to temperature-dependent bandgap behavior - ensuring reliable regulation across the full industrial and automotive temperature range.