STMicroelectronics LM4041DELT-1.2

Overview

LM4041DELT-1.2 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 1.225 V output with ±1% initial accuracy at 25 °C, 100 ppm/°C max temperature coefficient, and ultra-low 40 µA operating current. It operates across –40 to +125 °C (extended temperature range) in SOT23-3L package and serves as a compact, low-power reference in battery-operated instrumentation and energy management systems.

For engineers reviewing the LM4041DELT-1.2 datasheet, LM4041DELT-1.2 pinout, LM4041DELT-1.2 application, or LM4041DELT-1.2 equivalent, key selection criteria include shunt reference stability under capacitive loads, thermal drift performance over extended temperature, minimum cathode current requirements, and SOT23-3L footprint compatibility in space-constrained analog signal chains.

Technical Context

The LM4041DELT-1.2 functions as a two-terminal shunt reference, regulating voltage by sinking adjustable cathode current while maintaining precise reverse breakdown behavior. Its design eliminates need for external bias resistors in many configurations and supports stable operation with up to 1 µF capacitive load without oscillation.

It achieves ±1% initial tolerance (D-grade), 100 ppm/°C max tempco, and 0.4–1 Ω static impedance across 100 µA–1 mA cathode current range. The device's long-term stability is rated at 120 ppm over 1000 hours, and wideband noise is 60 µV_RMS (10 Hz–10 kHz).

Key Specifications

Pinout & Package

LM4041DELT-1.2 is housed in a 3-pin SOT23-3L surface-mount package. Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is NC (no connect, must be left floating or tied to Anode per layout guidance to reduce noise sensitivity).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431AIDBVR and MAX6008AEUR+T, LM4041DELT-1.2 uniquely balances 1.225 V native output, ±1% tolerance, extended –40 to +125 °C operation, and 40 µA min current in SOT23-3L-making it optimal for cost-sensitive, thermally demanding, and space-constrained shunt reference roles.

Availability

LM4041DELT-1.2 is available at Aetrix Electronics and suitable for battery-operated equipment, industrial sensor signal conditioning, and energy metering subsystems requiring stable component supply with guaranteed long-term availability.

Supply support for LM4041DELT-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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

LM4041 belongs to ST's precision analog reference product line, engineered specifically for low-power, high-stability voltage referencing in portable, battery-constrained, and thermally variable environments.

FAQ

What is the maximum cathode current rating for LM4041DELT-1.2?

The absolute maximum cathode current is 20 mA per the datasheet's absolute maximum ratings table. However, the recommended operating range is 40 µA to 12 mA to ensure specified electrical performance-including tempco, noise, and long-term stability-within the –40 to +125 °C extended temperature range.

Can LM4041DELT-1.2 drive a 1 µF capacitor directly without instability?

Yes. The LM4041DELT-1.2 is explicitly characterized and guaranteed stable with capacitive loads up to 1 µF, as confirmed in Section 4 ("Typical performance characteristics") and the "Stable when used with capacitive loads" feature list. No series resistor or isolation is required for this condition.

Is Pin 3 on the SOT23-3L package electrically connected internally?

No. Pin 3 is a no-connect (NC) terminal with no internal bond wire. The datasheet instructs that it must either be left floating or tied to Pin 2 (Anode) to improve noise immunity-particularly in high-EMI PCB layouts-due to its proximity to the die substrate connection.

How does the 1% initial accuracy of LM4041DELT-1.2 compare to the A-grade (0.1%) version in real-world use?

The D-grade (±1%) offers significantly lower cost and identical thermal, noise, and packaging specifications as the A-grade. In applications where system-level calibration compensates for offset-such as microcontroller-based ADCs with software gain/offset correction-the D-grade delivers equivalent end-system accuracy at reduced BOM cost and supply-chain risk.