STMicroelectronics LM4041CELT-1.2

Overview

LM4041CELT-1.2 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 1.225 V output with ±0.5% initial accuracy at 25 °C, 100 ppm/°C max temperature coefficient, and ultra-low 40 µA operating current in SOT23-3L package - used for biasing, feedback, and calibration in low-power analog signal chains.

For engineers reviewing the LM4041CELT-1.2 datasheet, LM4041CELT-1.2 pinout, LM4041CELT-1.2 application, or LM4041CELT-1.2 equivalent, key selection criteria include shunt reference stability under capacitive loads, thermal drift performance across -40 to +125 °C, and compatibility with space-constrained PCB layouts requiring SOT23-3L footprint.

Technical Context

The LM4041CELT-1.2 operates as a two-terminal shunt reference, sinking current to maintain a precise cathode-to-anode voltage of 1.225 V. It requires no external components for basic operation and remains stable with capacitive loads up to 1 µF - eliminating need for series resistance or compensation networks.

Its design supports wide operating current range (40 µA to 12 mA), enabling use in both ultra-low-power battery monitoring and higher-current feedback loops. The device achieves ±0.5% tolerance over industrial and extended temperature ranges (-40 to +125 °C), with long-term stability of 120 ppm after 1000 hours.

Key Specifications

Pinout & Package

LM4041CELT-1.2 is housed in a 3-pin SOT23-3L surface-mount package with exposed pad not electrically connected. Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is NC (no connection) - left floating or tied to Anode per layout guidelines to reduce noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4041CELT-1.2 uniquely balances 1.225 V native output, ±0.5% accuracy, extended -40 to +125 °C rating, and 40 µA operation - making it optimal for battery-powered industrial sensors and automotive body-control modules where voltage, power, and temperature constraints intersect.

Availability

LM4041CELT-1.2 is available at Aetrix Electronics and suitable for battery-operated equipment, switch-mode power supplies, and data acquisition systems requiring stable component supply with guaranteed long-term sourcing.

Supply support for LM4041CELT-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, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM4041 belongs to ST's precision analog reference product line, engineered specifically for high-accuracy, low-power voltage referencing in space- and energy-constrained applications - including portable instrumentation and automotive subsystems.

FAQ

What is the maximum cathode voltage rating for LM4041CELT-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 breakdown. This rating allows safe operation in 5 V systems with headroom for transient surges, and supports use with standard 12 V supply rails when paired with appropriate current-limiting resistors.

Can LM4041CELT-1.2 drive a 1 µF ceramic capacitor directly?

Yes - the LM4041CELT-1.2 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 isolation is required, simplifying layout in noise-sensitive measurement circuits.

How does the 0.5% accuracy grade compare to the 0.1% and 0.2% versions?

The LM4041CELT-1.2 offers ±0.5% initial accuracy at 25 °C versus ±0.1% (A-grade) and ±0.2% (B-grade). All grades share identical temperature coefficient (≤100 ppm/°C), operating current (40 µA), and package - making the C-grade optimal where cost sensitivity outweighs sub-0.2% tolerance requirements, such as in non-critical sensor biasing or mid-tier power supply feedback.

Is the SOT23-3L package RoHS-compliant and lead-free?

Yes - the LM4041CELT-1.2 uses ST's ECOPACK®-compliant SOT23-3L package, certified lead-free and RoHS-compliant per EU Directive 2011/65/EU. Mechanical data in Table 5 and the ECOPACK® footnote on page 8 confirm full environmental compliance, including halogen-free and REACH-conformant materials.