Analog Devices Inc./Maxim Integrated LM4050AEX3-5.0+T

Overview

LM4050AEX3-5.0+T from Analog Devices is a precision 5.000 V, 0.1% initial accuracy, 50 ppm/°C max temperature coefficient shunt voltage reference in a 3-pin SC70 package. It operates over -40°C to +125°C with 60 µA to 15 mA shunt current capability and 80 µV_RMS wideband noise (10 Hz–10 kHz), enabling stable reference generation in space-constrained battery-powered systems.

For engineers reviewing the LM4050AEX3-5.0+T datasheet, LM4050AEX3-5.0+T pinout, LM4050AEX3-5.0+T application, or LM4050AEX3-5.0+T equivalent, key selection criteria include guaranteed initial tolerance (±5.0 mV at +25°C), low dynamic impedance (0.5–1.1 Ω), no external capacitor requirement, and AEC-Q100 qualification for automotive use cases.

Technical Context

The LM4050AEX3-5.0+T implements a laser-trimmed bandgap shunt architecture that maintains a precise 5.000 V reverse breakdown voltage across its cathode (+) and anode (–) terminals when biased with 60 µA–15 mA reverse current. Its internal pass transistor sinks variable current to regulate output voltage under varying load and supply conditions.

It exhibits ±15 ppm/°C typical temperature coefficient (guaranteed ≤50 ppm/°C over –40°C to +125°C), supports capacitive loads without oscillation, and achieves 120 ppm long-term stability after 1000 hours. Pin 3 is unconnected or tied to pin 2 - a design feature enabling robust layout in ultra-dense PCBs.

Key Specifications

Pinout & Package

The LM4050AEX3-5.0+T is housed in a 3-pin SC70 surface-mount package (1.8 mm × 1.8 mm), 50% smaller than SOT23. Thermal resistance is θ_JA = 340.4°C/W on a four-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4050AEX3-5.0+T, LM4040C50IDBZR trades 5× lower accuracy for lower cost, while ADR3450ARJZ-R7 improves noise and tempco at the expense of minimum current compliance and automotive qualification - making LM4050AEX3-5.0+T optimal for space-constrained, high-reliability, mixed-signal embedded systems demanding guaranteed 0.1% and AEC-Q100 support.

Availability

LM4050AEX3-5.0+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive cabin sensors, and industrial data acquisition requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LM4050AEX3-5.0+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LM4050/LM4051 family was designed to deliver precision shunt references for space- and power-constrained applications - emphasizing ultra-small packaging, micropower operation, and guaranteed performance across extended temperature ranges.

FAQ

What is the guaranteed initial accuracy of LM4050AEX3-5.0+T at +25°C?

The LM4050AEX3-5.0+T has a guaranteed initial accuracy of ±0.1% (±5.0 mV) at +25°C, as specified in the Electrical Characteristics table for Grade A devices. This tolerance is laser-trimmed at wafer level and confirmed during 100% production testing, ensuring consistent performance without post-assembly calibration.

Does LM4050AEX3-5.0+T require an external output capacitor for stability?

No, the LM4050AEX3-5.0+T does not require an external output capacitor for stability. Its shunt architecture and internal compensation ensure unconditional stability with any capacitive load - a key advantage over series references that demand specific ESR and capacitance ranges.

What is the minimum shunt current needed for proper regulation of LM4050AEX3-5.0+T?

The LM4050AEX3-5.0+T requires a minimum shunt current of 60 µA to maintain regulation across the full temperature range (–40°C to +125°C). At +25°C, the typical minimum is 54 µA, but 60 µA ensures margin for worst-case process and temperature variation.

Is LM4050AEX3-5.0+T qualified for automotive applications?

Yes, the LM4050AEX3-5.0+T is AEC-Q100 qualified for automotive applications. It meets Grade 1 requirements (–40°C to +125°C ambient), including stress testing for temperature cycling, humidity, and mechanical shock - making it suitable for cabin sensors, body control modules, and ADAS subsystems.

What package type and dimensions does LM4050AEX3-5.0+T use?

The LM4050AEX3-5.0+T uses a 3-pin SC70 package measuring 1.8 mm × 1.8 mm × 0.9 mm. Its outline number is 21-0075, land pattern number is 90-0208, and it features RoHS-compliant terminations indicated by the "+" suffix in the package code.