STMicroelectronics LM4041AECT-1.2

Overview

LM4041AECT-1.2 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 1.225 V output with ±0.1% initial accuracy at 25 °C, 100 ppm/°C max temperature coefficient, and ultra-low 40 µA operating current. It is designed for high-accuracy biasing and regulation in space-constrained, low-power systems such as battery-operated instrumentation and energy management circuits.

For engineers reviewing the LM4041AECT-1.2 datasheet, LM4041AECT-1.2 pinout, LM4041AECT-1.2 application, or LM4041AECT-1.2 equivalent, this page provides verified electrical specifications, SOT323-5L package details, thermal performance data, noise characteristics, and validated alternative options for industrial and extended-temperature designs.

Technical Context

The LM4041AECT-1.2 operates as a two-terminal shunt reference, requiring only an external cathode resistor to set operating current. Its internal bandgap core achieves ±0.1% tolerance and maintains regulation across -40 °C to +125 °C with ≤100 ppm/°C drift.

It exhibits 60 µV_RMS wideband noise (10 Hz–10 kHz), <1 Ω static impedance (ΔI_K = 100 µA to 1 mA), and stable operation with capacitive loads-enabling direct use in ADC reference buffers and precision feedback loops without series isolation.

Key Specifications

Pinout & Package

LM4041AECT-1.2 is housed in a 5-pin SOT323-5L surface-mount package. Pins 1 and 3 are cathode (K), Pin 2 is anode (A), and Pins 4 & 5 are NC (no-connect) - left floating or tied to anode per layout guidelines to reduce noise susceptibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBVR and MAX6002AEUR+T, the LM4041AECT-1.2 uniquely combines 1.225 V output, ±0.1% accuracy, SOT323-5L compactness, and extended-temperature capability-making it optimal for next-generation portable and harsh-environment precision analog systems.

Availability

LM4041AECT-1.2 is available at Aetrix Electronics and suitable for battery-operated equipment, energy management systems, and industrial data acquisition requiring stable component supply across extended temperature ranges.

Supply support for LM4041AECT-1.2 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The LM4041 product line delivers precision shunt references optimized for micropower, high-accuracy, and thermally robust operation in space-constrained analog subsystems-from portable medical devices to smart grid infrastructure.

FAQ

What is the maximum cathode voltage rating for LM4041AECT-1.2?

The absolute maximum cathode voltage is 8 V, as specified in the datasheet's Absolute Maximum Ratings table. Exceeding this may cause irreversible damage. For reliable operation, design the series current-limiting resistor to ensure cathode voltage remains within 8 V under all load and supply conditions-including transient surges and startup overshoot.

Can LM4041AECT-1.2 drive a 1 µF ceramic capacitor directly?

Yes-the device is explicitly characterized for stability with ≥1 µF capacitive loads, as confirmed in Figure 4 (Output Impedance vs. Frequency) and the "Stable when used with capacitive loads" feature list. No series resistor or damping network is required, simplifying layout in power-supply monitor and ADC reference applications.

How does the SOT323-5L package improve thermal performance over SOT23-3L?

SOT323-5L offers lower junction-to-ambient thermal resistance (233 °C/W vs. 248 °C/W for SOT23-3L), enabling higher power dissipation at elevated ambient temperatures. This improves long-term stability and reliability in extended-temperature applications like automotive engine control modules or industrial motor drives.

Is the 0.1% accuracy guaranteed over the full -40 °C to +125 °C range?

No-the ±0.1% initial accuracy is specified at 25 °C only. Over temperature, total error includes drift due to temperature coefficient (≤100 ppm/°C), resulting in up to ±0.1225% deviation at extremes. Full-range accuracy is guaranteed by the combined specification of initial tolerance plus tempco, not by standalone 0.1% across temperature.