Texas Instruments LM4041BIDBZTG4

Overview

LM4041BIDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a fixed 1.225 V output with ±0.2% initial tolerance (B grade), 100 ppm/°C max temperature coefficient, and 20 μV_RMS wideband noise. It operates from 45 μA to 12 mA cathode current and supports industrial temperature range (–40°C to +85°C), making it suitable for high-accuracy analog signal conditioning in portable data-acquisition systems.

For engineers reviewing the LM4041BIDBZTG4 datasheet, LM4041BIDBZTG4 pinout, LM4041BIDBZTG4 application, or LM4041BIDBZTG4 equivalent, key selection criteria include output stability under varying load currents, low-noise performance in ADC reference paths, compatibility with capacitive loads without external compensation, and thermal drift behavior across –40°C to 85°C ambient conditions.

Technical Context

The LM4041BIDBZTG4 implements a trimmed Zener-based shunt architecture with fuse and Zener-zap wafer-level trimming to achieve tight initial tolerance. Its internal reference core maintains regulation by sinking cathode current proportional to the difference between applied reverse voltage and its 1.225 V breakdown threshold.

It features low dynamic impedance (≤1.5 Ω at 1 mA), stable operation with any capacitive load (no output capacitor required), and minimal feedback current (≤100 nA), enabling use in high-impedance adjustable configurations via external resistor dividers - though LM4041BIDBZTG4 itself is the fixed-output variant.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: compact 2.92 mm × 1.3 mm surface-mount outline with gull-wing leads, JEDEC MO-178 compliant, rated for reflow per Level-1-260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4041C12IDBZT, LM4041BIDBZTG4 delivers tighter initial accuracy and identical thermal drift, justifying premium cost in uncalibrated systems; versus REF3012AIDBZR, LM4041BIDBZTG4 offers shunt flexibility, zero-capacitor operation, and lower quiescent current but trades off tempco performance.

Availability

LM4041BIDBZTG4 is available at Aetrix Electronics and suitable for portable data-acquisition systems, industrial power-supply monitors, and energy metering front-ends requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LM4041BIDBZTG4 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 and embedded processing technologies, with decades of expertise in precision reference design and high-volume manufacturing.

The LM4041 product line delivers micropower shunt voltage references optimized for accuracy-critical, space-constrained applications including portable instrumentation, industrial sensing, and energy infrastructure - emphasizing low noise, wide current range, and robust thermal performance.

FAQ

What is the output voltage and tolerance of LM4041BIDBZTG4?

The LM4041BIDBZTG4 provides a fixed 1.225 V nominal output voltage with a maximum initial tolerance of ±0.2% at 25°C (B grade specification). This tolerance holds across the full industrial temperature range of –40°C to +85°C, and the device maintains stability without requiring an output capacitor. The LM4041BIDBZTG4 achieves this accuracy via wafer-level Zener-zap trimming.

Does LM4041BIDBZTG4 require an output capacitor for stability?

No, LM4041BIDBZTG4 does not require an output capacitor for stability. Its internal design ensures robust operation with any capacitive load - from 0 to infinity - eliminating the need for external bypass components. This simplifies PCB layout, reduces BOM count, and improves reliability in space-constrained applications such as portable medical devices and handheld test equipment.

What is the minimum cathode current needed for LM4041BIDBZTG4 to regulate properly?

The LM4041BIDBZTG4 requires a minimum cathode current of 45 μA (typical) to maintain regulation. At temperatures across –40°C to +85°C, the guaranteed minimum is 80 μA. Below this threshold, output voltage may deviate beyond specifications. Designers must size the series resistor accordingly, especially in low-power sleep modes where supply current drops near this limit.

How does LM4041BIDBZTG4 compare to adjustable versions like LM4041BIDCKR?

LM4041BIDBZTG4 is a fixed-output variant (1.225 V) in SOT-23-3 package, while LM4041BIDCKR is an adjustable version in SC-70-5 with FB pin for external resistor-divider programming (1.225 V to 10 V). They share B-grade tolerance and tempco, but LM4041BIDBZTG4 omits the FB pin and NC pin configuration differs. Pin compatibility is not maintained between packages or variants.

What is the thermal performance of LM4041BIDBZTG4 over temperature?

LM4041BIDBZTG4 exhibits a maximum average temperature coefficient of 100 ppm/°C over –40°C to +85°C, translating to ≤0.85 mV total drift across the full range. Typical drift is lower (e.g., ±20 ppm/°C at 10 mA), and long-term stability is specified at 120 ppm after 1000 hours - critical for applications like utility metering where calibration intervals exceed five years.