Analog Devices Inc./Maxim Integrated LM4050AEM3-3.0+T

Overview

LM4050AEM3-3.0+T from Analog Devices is a precision 3.000 V, 0.1% initial accuracy, 50 ppm/°C max temperature coefficient shunt voltage reference in a 3-pin SOT23 package. It operates over -40°C to +125°C with 60 µA to 15 mA shunt current capability and 28 µV_RMS wideband noise (10 Hz–10 kHz), enabling stable reference generation in space-constrained battery-powered systems.

For engineers reviewing the LM4050AEM3-3.0+T datasheet, LM4050AEM3-3.0+T pinout, LM4050AEM3-3.0+T application, or LM4050AEM3-3.0+T equivalent, key selection criteria include guaranteed 0.1% initial tolerance at +25°C, no external capacitor requirement, compatibility with capacitive loads, and AEC-Q100 qualification for automotive use cases.

Technical Context

The LM4050AEM3-3.0+T implements a laser-trimmed bandgap shunt reference architecture, delivering fixed 3.000 V reverse breakdown voltage with ±3.0 mV (±0.1%) tolerance at +25°C and ±18 mV total tolerance over -40°C to +125°C. Its dynamic impedance remains ≤0.8 Ω at 1 mA, ensuring minimal output voltage shift under load transients.

It functions as a two-terminal device requiring only a series resistor for biasing, clamping to ~0.7 V below ground under forward conduction up to 10 mA. Stability is maintained across all capacitive loads without external compensation, and long-term drift is limited to 120 ppm after 1000 hours.

Key Specifications

Pinout & Package

LM4050AEM3-3.0+T uses the 3-pin SOT23 surface-mount package (1.8 mm × 2.9 mm × 1.1 mm), optimized for high-density PCB layouts. Pin 3 is unconnected (N.C.) and must be left floating or tied to Pin 2 per datasheet guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431AIDBZR and REF3030AIDBZR, LM4050AEM3-3.0+T delivers superior initial accuracy (0.1% vs. 1% or 0.2%), lower noise (28 µV_RMS vs. ≥40 µV_RMS), and true micropower shunt operation-making it optimal for fixed-voltage, space- and power-constrained precision analog systems.

Availability

LM4050AEM3-3.0+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive engine control units, and industrial data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4050AEM3-3.0+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

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 series belongs to Analog Devices' precision voltage reference product line, designed specifically for applications demanding high initial accuracy, low temperature drift, and robust operation in harsh environments without external stabilization components.

FAQ

What is the exact output voltage tolerance of LM4050AEM3-3.0+T at +25°C?

The LM4050AEM3-3.0+T has a guaranteed reverse breakdown voltage of 3.000 V with ±3.0 mV (±0.1%) tolerance at +25°C, as specified in the Electrical Characteristics table for the "A" grade. This tight tolerance is achieved via laser trimming and ensures minimal calibration overhead in high-accuracy measurement systems using LM4050AEM3-3.0+T.

Does LM4050AEM3-3.0+T require an external output capacitor for stability?

No, LM4050AEM3-3.0+T does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load, eliminating the need for external compensation components. This simplifies layout, reduces BOM count, and improves reliability-key advantages confirmed in the datasheet's "No Output Capacitors Required" feature and stability test results for LM4050AEM3-3.0+T.

What is the minimum operating current for LM4050AEM3-3.0+T, and why is it critical?

The LM4050AEM3-3.0+T requires a minimum shunt current of 60 µA to maintain regulation and specified accuracy. Operating below this threshold risks loss of voltage regulation and increased temperature sensitivity. Designers must size the series resistor (R_S) to ensure ≥60 µA flows through LM4050AEM3-3.0+T even under worst-case conditions (min supply voltage, max load current).

Is LM4050AEM3-3.0+T qualified for automotive applications?

Yes, LM4050AEM3-3.0+T is AEC-Q100 qualified for automotive applications. The datasheet explicitly states AEC-Q100 qualification in the Features section and confirms operation over -40°C to +125°C, making LM4050AEM3-3.0+T suitable for under-hood and cabin electronics including engine control, body modules, and ADAS sensor interfaces.

How does the temperature coefficient of LM4050AEM3-3.0+T affect system accuracy over temperature?

The LM4050AEM3-3.0+T has a maximum temperature coefficient of 50 ppm/°C over -40°C to +125°C. Over this 165°C span, total drift is bounded by ±8.25 mV (50 ppm/°C × 165°C × 3.0 V), contributing <0.28% full-scale error. This predictable, linear drift allows effective software compensation in closed-loop systems using LM4050AEM3-3.0+T as a reference.