Analog Devices Inc./Maxim Integrated LM4041BEM3-1.2+T

Overview

LM4041BEM3-1.2+T from Maxim Integrated is a precision 1.225V two-terminal shunt voltage reference in SOT23-3 package, with 0.2% initial accuracy, 100ppm/°C max temperature coefficient, 60µA–12mA operating current range, and guaranteed operation from –40°C to +125°C - used for ADC/DAC biasing and sensor excitation in industrial controls.

For engineers reviewing the LM4041BEM3-1.2+T datasheet, LM4041BEM3-1.2+T pinout, LM4041BEM3-1.2+T application, or LM4041BEM3-1.2+T equivalent, key selection criteria include shunt current compliance, thermal stability over extended temperature range, no-output-capacitor requirement, and SOT23-3 footprint compatibility in space-constrained designs.

Technical Context

The LM4041BEM3-1.2+T implements a bandgap-based shunt reference architecture delivering a fixed 1.225V reverse breakdown voltage. It operates as a two-terminal device where cathode (Pin 2) and anode (Pin 1) define the reference node, and Pin 3 is NC or tied to Pin 2 - eliminating series pass transistor complexity while maintaining regulation across 60µA–12mA load currents.

Its internal BiCMOS process enables low dynamic impedance (≤1.5Ω at 1mA), 20µVRMS wideband noise (10Hz–10kHz), and stable performance with any capacitive load - all without requiring external stabilization capacitors. Temperature drift is bounded by ±100ppm/°C over –40°C to +125°C, with long-term stability of 120ppm after 1000 hours.

Key Specifications

Pinout & Package

LM4041BEM3-1.2+T uses the industry-standard 3-pin SOT23-3 package (2.92mm × 1.3mm × 1.0mm), optimized for automated assembly and thermal dissipation up to 320mW at +70°C (derated 4.01mW/°C above).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBVR and ADR3412ARJZ-R7, the LM4041BEM3-1.2+T offers optimal balance of fixed 1.225V output, 3-pin simplicity, extended temperature rating, and micropower operation - making it preferred for compact, battery-critical, and high-reliability industrial designs where pin count and thermal robustness are primary constraints.

Availability

LM4041BEM3-1.2+T is available at Aetrix Electronics and suitable for industrial process controls, portable medical instrumentation, and automotive cabin sensing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LM4041BEM3-1.2+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The LM4041 product line delivers precision micropower shunt references designed for space-constrained, battery-operated, and high-temperature applications where stability, accuracy, and minimal external components are essential.

FAQ

What is the exact output voltage tolerance of LM4041BEM3-1.2+T at +25°C?

The LM4041BEM3-1.2+T has a reverse breakdown voltage of 1.225V with ±0.2% initial accuracy at +25°C, corresponding to a tolerance band of 1.2226V to 1.2275V. This specification is laser-trimmed and guaranteed per Maxim's production test flow, ensuring consistent performance across units without post-manufacture calibration.

Does LM4041BEM3-1.2+T require an external capacitor for stability?

No, the LM4041BEM3-1.2+T does not require an external output capacitor for stability. Its internal design ensures unconditional stability with any capacitive load, including direct connection to ADC reference pins or noisy digital supply rails - a key advantage over many three-terminal references that mandate minimum ESR or capacitance.

What is the maximum operating temperature range for LM4041BEM3-1.2+T?

The LM4041BEM3-1.2+T is rated for operation from –40°C to +125°C. This extended temperature grade (denoted by "E" in the part number) is validated across the full range, with electrical parameters guaranteed per the datasheet's Electrical Characteristics table under those conditions - critical for under-hood automotive and industrial control applications.

How is Pin 3 used on LM4041BEM3-1.2+T?

Pin 3 of the LM4041BEM3-1.2+T is labeled N.C. (No Connect) and must either be left floating or connected directly to Pin 2 (cathode). It has no internal connection and serves no functional role; incorrect routing (e.g., tying to VCC or signal lines) may compromise reliability or violate absolute maximum ratings.

Can LM4041BEM3-1.2+T replace LM4041AIM3-1.2+T in existing designs?

Yes, the LM4041BEM3-1.2+T can replace LM4041AIM3-1.2+T in most cases, as both share identical SOT23-3 packaging, pinout, and 1.225V output. However, the "B" grade has ±0.2% initial accuracy versus ±0.1% for "A", and the "E" grade extends operation to +125°C versus +85°C for "I". Verify thermal and accuracy margins in your application before substitution.