STMicroelectronics LM4041BILT-1.2

Overview

LM4041BILT-1.2 from STMicroelectronics is a precision micropower shunt voltage reference delivering 1.225 V nominal output with ±0.2% initial accuracy at 25 °C, 40 µA typical operating current, and 100 ppm/°C max temperature coefficient in SOT23-3L package. It serves as a stable voltage reference in low-power analog signal chains for battery-operated instrumentation and energy management systems.

For engineers reviewing the LM4041BILT-1.2 datasheet, LM4041BILT-1.2 pinout, LM4041BILT-1.2 application, or LM4041BILT-1.2 equivalent, key selection criteria include ultra-low quiescent current, tight initial tolerance, capacitive-load stability, and industrial temperature range suitability for space-constrained power monitoring circuits.

Technical Context

The LM4041BILT-1.2 operates as a two-terminal shunt reference, sinking current to maintain a precise cathode-to-anode voltage. Its regulation requires only a series resistor and functions without external capacitors, though it remains stable with up to 1 µF load capacitance.

It achieves ±0.2% accuracy via laser-trimmed bandgap circuitry and exhibits 60 µV_RMS wideband noise (10 Hz–10 kHz) and 0.4–1 Ω static impedance across its 40 µA–12 mA operating current range.

Key Specifications

Pinout & Package

LM4041BILT-1.2 is housed in a 3-pin SOT23-3L surface-mount package (JEDEC MO-178AA), with 1.0 mm max height and 2.9 mm × 1.3 mm footprint. Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is 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 MAX6008BAUT+T, LM4041BILT-1.2 offers exact 1.225 V output without external components, lowest thermal drift among SOT23-3 shunts, and proven stability with direct capacitive loading-critical for compact, battery-sensitive designs.

Availability

LM4041BILT-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 availability and consistent parametric performance.

Supply support for LM4041BILT-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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LM4041 product line delivers precision micropower shunt references optimized for space-constrained, low-current applications including portable instrumentation, energy metering, and battery management where accuracy, stability, and minimal board area are critical.

FAQ

What is the minimum operating current required for regulation in LM4041BILT-1.2?

The LM4041BILT-1.2 requires a minimum operating current of 40 µA at 25 °C and 50 µA across the full –40 to +85 °C industrial temperature range. Below this threshold, the device exits regulation and cathode voltage drops below 1.225 V. This value is confirmed in Table 3 of the official ST datasheet (DocID018817 Rev 4).

Can LM4041BILT-1.2 drive a 1 µF capacitor directly without oscillation?

Yes - the LM4041BILT-1.2 is explicitly characterized for stability with capacitive loads up to 1 µF, as shown in Figure 4 (Output Impedance vs. Frequency) and stated in the Features section. No series isolation resistor is required, unlike many competing shunt references that become unstable above 10 nF.

What does the "B" in LM4041BILT-1.2 indicate?

The "B" denotes the initial accuracy grade: ±0.2% at 25 °C. ST uses "A" (±0.1%), "B" (±0.2%), "C" (±0.5%), and "D" (±1.0%) to specify tolerance grades. The "ILT" suffix confirms SOT23-3L packaging and industrial temperature range (–40 to +85 °C), per Table 9 in the datasheet.

Is LM4041BILT-1.2 RoHS-compliant and halogen-free?

Yes - LM4041BILT-1.2 is manufactured in ST's ECOPACK®-compliant SOT23-3L package, meeting RoHS Directive 2011/65/EU and halogen-free requirements per IEC 61249-2-21. Full compliance documentation is available in ST's ECOPACK® database referenced in Section 5 of the datasheet.