Analog Devices Inc./Maxim Integrated LM4050AEX3-2.5/V+T

Overview

LM4050AEX3-2.5/V+T from Analog Devices is a precision 2.500 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, low 35 µV_RMS noise (10 Hz–10 kHz), and no external capacitor requirement-ideal for high-accuracy ADC/DAC biasing in automotive sensor modules.

For engineers reviewing the LM4050AEX3-2.5/V+T datasheet, LM4050AEX3-2.5/V+T pinout, LM4050AEX3-2.5/V+T application, or LM4050AEX3-2.5/V+T equivalent, key selection criteria include guaranteed AEC-Q100 qualification (/V suffix), SC70 thermal performance (θ_JA = 340.4°C/W), reverse breakdown voltage stability across load current (±1.0 mV change from 60 µA to 1 mA), and compatibility with capacitive loads without oscillation.

Technical Context

The LM4050AEX3-2.5/V+T implements a laser-trimmed bandgap shunt architecture that maintains a stable 2.500 V reverse breakdown voltage across its cathode-anode terminals under 60 µA–15 mA shunt current. Its internal design eliminates need for output capacitance while tolerating arbitrary capacitive loading-a direct result of low dynamic impedance (0.3–0.8 Ω at 1 mA) and optimized pass transistor dynamics.

Guaranteed AEC-Q100 qualification confirms suitability for automotive applications requiring robustness across -40°C to +125°C ambient, with long-term stability of ≤120 ppm after 1000 hours and ±15 ppm/°C typical temperature coefficient. The /V suffix explicitly denotes automotive-grade screening per AEC-Q100 Rev G, including extended reliability testing and traceable lot control.

Key Specifications

Pinout & Package

LM4050AEX3-2.5/V+T uses the 3-pin SC70 package (1.8 mm × 1.8 mm), optimized for space-constrained automotive PCBs. Pin 3 is NC (no connection) 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 LM4050AEX3-2.5/V+T, the LM4050AEM3-2.5/V+T offers identical performance in a larger package for easier handling, while the ADR3425ARJZ-R7 trades AEC-Q100 compliance and micropower operation for superior tempco-making LM4050AEX3-2.5/V+T the optimal balance for space-constrained automotive systems.

Availability

LM4050AEX3-2.5/V+T is available at Aetrix Electronics and suitable for automotive sensor modules, industrial 4–20 mA transmitters, portable medical devices, and smart energy metering requiring stable component supply with AEC-Q100 assurance and long-lifecycle support.

Supply support for LM4050AEX3-2.5/V+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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The LM4050/LM4051 family was designed specifically for precision shunt reference applications in automotive, industrial, and portable systems demanding AEC-Q100 qualification, ultra-small packaging, and guaranteed micropower operation.

FAQ

What does the "/V" suffix mean in LM4050AEX3-2.5/V+T?

The "/V" suffix indicates full AEC-Q100 qualification per Revision G, including high-temperature operating life (HTOL), temperature cycling, ESD, and mechanical stress testing. LM4050AEX3-2.5/V+T is screened for automotive applications such as engine control, ADAS sensors, and body electronics-unlike standard LM4050AEX3-2.5+T which lacks this qualification. This distinction is critical for functional safety compliance.

Can LM4050AEX3-2.5/V+T operate without an external capacitor?

Yes, LM4050AEX3-2.5/V+T is internally compensated and stable with any capacitive load-from 0 pF to >10 µF-eliminating the need for external output capacitors. This simplifies layout in space-constrained automotive modules and avoids capacitor-related aging or ESR issues. Stability is maintained even with ceramic, tantalum, or electrolytic output caps.

What is the minimum shunt current required for regulation in LM4050AEX3-2.5/V+T?

LM4050AEX3-2.5/V+T requires a minimum shunt current of 60 µA to maintain regulation within specifications across -40°C to +125°C. Below this threshold, output voltage may deviate beyond the 0.1% initial accuracy band. Designers must size the series resistor (RS) to guarantee ≥60 µA shunt current under worst-case conditions (min VS, max ILOAD).

How does LM4050AEX3-2.5/V+T compare to LM4050AEM3-2.5/V+T electrically?

LM4050AEX3-2.5/V+T and LM4050AEM3-2.5/V+T share identical electrical specifications-including 2.500 V output, 0.1% initial accuracy, 50 ppm/°C tempco, and AEC-Q100 qualification-but differ only in package: SC70 (1.8 mm × 1.8 mm) vs. SOT23 (2.92 mm × 1.3 mm). Thermal resistance differs (θ_JA = 340.4°C/W vs. 336°C/W), but both meet automotive thermal requirements.

Is LM4050AEX3-2.5/V+T suitable for precision ADC reference applications?

Yes, LM4050AEX3-2.5/V+T is widely used as a reference for 12–16-bit ADCs due to its 35 µV_RMS wideband noise (10 Hz–10 kHz), low dynamic impedance (0.3–0.8 Ω), and 0.1% initial accuracy. Its stability under capacitive loads and micropower operation make it ideal for battery-powered data loggers and sensor nodes where ADC SNR and power efficiency are critical.