Texas Instruments LM4041CIDBZRG4

Overview

LM4041CIDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 (DBZ) package, delivering a fixed 1.225 V output with ±0.5% initial tolerance and 100 ppm/°C temperature coefficient over –40°C to +85°C. It operates from 45 μA to 12 mA cathode current, exhibits 20 μV_RMS wideband noise, and requires no output capacitor-enabling stable use in battery-powered data-acquisition systems and power-supply monitors.

For engineers reviewing the LM4041CIDBZRG4 datasheet, LM4041CIDBZRG4 pinout, LM4041CIDBZRG4 application, or LM4041CIDBZRG4 equivalent, key selection criteria include its fixed 1.225 V output, industrial-grade temperature range, low quiescent current, stability with capacitive loads, and compatibility with space-constrained PCB layouts using the 3-pin SOT-23 footprint.

Technical Context

The LM4041CIDBZRG4 implements a Zener-based shunt reference architecture trimmed via Zener-zap during wafer sort to achieve ±0.5% output tolerance (C grade). Its internal structure includes a low-dynamic-impedance (≤1.5 Ω at 1 mA) core and feedback-controlled bandgap-derived reference node, enabling stable regulation across wide current and temperature variations.

It functions as a two-terminal shunt device: cathode sinks current while anode is typically grounded; output voltage appears across cathode-to-anode. The DBZ package variant has no feedback (FB) pin-confirming this is the fixed-output version, not adjustable-eliminating external resistor divider requirements and simplifying layout for precision analog sensing paths.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 1.3 mm × 1.02 mm body, surface-mount, RoHS-compliant, tape-and-reel (250 pcs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDBZR and REF3012AIDBZR, the LM4041CIDBZRG4 offers direct 1.225 V compatibility, lowest quiescent current, and shunt topology simplicity-making it optimal for compact, battery-sensitive, fixed-voltage reference designs where output capacitance must be avoided.

Availability

LM4041CIDBZRG4 is available at Aetrix Electronics and suitable for data-acquisition systems, power-supply monitors, and energy metering applications requiring stable component supply, long-term calibration integrity, and industrial-temperature operation.

Supply support for LM4041CIDBZRG4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision reference design and high-reliability manufacturing.

The LM4041 series was developed for cost-sensitive, space-constrained applications demanding micropower operation, capacitor-free stability, and guaranteed performance across industrial and extended temperature ranges.

FAQ

What is the output voltage and tolerance of the LM4041CIDBZRG4?

The LM4041CIDBZRG4 provides a fixed 1.225 V nominal output voltage with a maximum initial tolerance of ±0.5% at 25°C (C grade). This tolerance holds across the full industrial temperature range of –40°C to +85°C, making it suitable for applications requiring predictable, calibrated reference performance without post-manufacturing trimming. The LM4041CIDBZRG4 achieves this via Zener-zap trimming during wafer sort.

Does the LM4041CIDBZRG4 require an output capacitor for stability?

No, the LM4041CIDBZRG4 does not require an output capacitor for stability-it is explicitly designed to remain stable with all capacitive loads, including 0 µF. This eliminates the need for external bypass components, reduces BOM count, and saves PCB area. While adding a capacitor is permissible and may improve high-frequency noise rejection, it is never mandatory for loop stability in any LM4041CIDBZRG4 application.

What is the minimum operating current for the LM4041CIDBZRG4?

The LM4041CIDBZRG4 has a typical minimum cathode current (I_Z,min) of 45 μA at 25°C, with a maximum of 80 μA across –40°C to +85°C. This ultralow operating current enables multi-year battery life in always-on portable instruments and IoT edge sensors. Designers must ensure the series resistor supplies ≥80 μA under worst-case conditions (minimum input voltage, maximum load current) to maintain regulation.

Is the LM4041CIDBZRG4 compatible with the SOT-23-3 footprint used by other TI references?

Yes, the LM4041CIDBZRG4 uses the standard 3-pin SOT-23 (DBZ) package with identical mechanical dimensions (2.92 mm × 1.3 mm × 1.02 mm) and pinout as other LM4041 variants in DBZ. Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is NC (no-connect). This allows direct PCB footprint reuse across A/B/C/D grades and fixed-output versions-though electrical parameters (tolerance, tempco) differ by grade and must be verified per design requirements.

How does the LM4041CIDBZRG4 perform in terms of output noise?

The LM4041CIDBZRG4 delivers 20 μV_RMS wideband noise over 10 Hz to 10 kHz, measured at 100 μA cathode current. This low-noise performance is critical for high-resolution data acquisition-supporting 16-bit+ ADC accuracy without additional filtering. The noise spectral density remains flat across frequency, and the device's low dynamic impedance (≤1.5 Ω) prevents noise amplification in buffered configurations.