Texas Instruments LM4040B30IDBZRG4

Overview

LM4040B30IDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 3.0V output with ±0.2% initial accuracy (B grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 47μA to 15mA cathode current - used in analog input modules and field transmitters requiring high-accuracy DC biasing.

For engineers reviewing the LM4040B30IDBZRG4 datasheet, LM4040B30IDBZRG4 pinout, LM4040B30IDBZRG4 application, or LM4040B30IDBZRG4 equivalent, key selection criteria include industrial-temperature operation (–40°C to 85°C), SOT-23-3 package compatibility, low dynamic impedance (0.4Ω typical), thermal hysteresis ≤0.08%, and no external capacitor requirement for stability.

Technical Context

The LM4040B30IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 3.0V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves tight initial tolerance without laser trimming, and its low 100ppm/°C tempco ensures minimal drift over –40°C to 85°C.

It exhibits low dynamic impedance (0.4Ω at 1mA), enabling stable regulation under varying load conditions, and delivers 35μVRMS noise (10Hz–10kHz) - critical for high-resolution ADC biasing and precision sensor excitation circuits where reference noise directly limits system SNR.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount compatible, thermally efficient with R_θJA = 206°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040C30IDBZR, the LM4040B30IDBZRG4 offers tighter initial tolerance for calibration-critical systems; compared with REF3030AIDBZR, it eliminates external capacitance needs and reduces PCB area but trades off some load regulation performance.

Availability

LM4040B30IDBZRG4 is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and data-acquisition systems requiring stable component supply with guaranteed long-term sourcing and TI-authorized traceability.

Supply support for LM4040B30IDBZRG4 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.

The LM4040 family was engineered for cost-sensitive, space-constrained applications demanding high accuracy without external components - targeting portable instrumentation, industrial sensors, and energy metering.

FAQ

What is the operating temperature range for LM4040B30IDBZRG4?

The LM4040B30IDBZRG4 is characterized for industrial-temperature operation from –40°C to +85°C. This range is explicitly specified in the device comparison table and electrical characteristics sections for the "I" suffix variants, confirming suitability for factory automation, outdoor monitoring, and other non-automotive industrial environments.

Does LM4040B30IDBZRG4 require an external output capacitor?

No, LM4040B30IDBZRG4 does not require an external output capacitor. The datasheet states it is "stable with all capacitive loads" and "no output capacitor required," a core feature enabled by its internal compensation and low dynamic impedance - simplifying layout and reducing BOM count.

What is the minimum cathode current needed for LM4040B30IDBZRG4 to regulate properly?

The LM4040B30IDBZRG4 requires a minimum cathode current of 47μA at 25°C (82μA over full temperature range) to maintain regulation within specifications. This value is confirmed in Table 6.11 (LM4040A30I/LM4040B30I Electrical Characteristics) and enables ultra-low-power operation in battery-backed sensor nodes.

How does the noise performance of LM4040B30IDBZRG4 impact high-resolution ADC applications?

LM4040B30IDBZRG4 delivers 35μVRMS wideband noise (10Hz–10kHz), directly limiting the effective number of bits (ENOB) in ADC systems. For a 3.0V reference, this corresponds to ~11.5-bit noise floor - sufficient for 16-bit ADCs with proper filtering, and critical for maintaining SNR in precision data loggers and test equipment.

Is LM4040B30IDBZRG4 pin-compatible with other LM4040 variants in SOT-23-3?

Yes, LM4040B30IDBZRG4 uses the standard DBZ (SOT-23-3) package with identical pinout (Cathode–Anode–NC) as all other LM4040x30I DBZ variants - including LM4040A30IDBZR, LM4040C30IDBZR, and LM4040D30IDBZR - enabling drop-in replacement within the same grade or accuracy tier.