Texas Instruments LM4040C50IDBZRG4

Overview

LM4040C50IDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference with 5.0V nominal output, ±0.5% initial accuracy (C grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, low-drift voltage reference in analog signal chains for industrial sensors and data-acquisition front-ends.

For engineers reviewing the LM4040C50IDBZRG4 datasheet, LM4040C50IDBZRG4 pinout, LM4040C50IDBZRG4 application, or LM4040C50IDBZRG4 equivalent, key selection criteria include its SOT-23-3 package, -40°C to 85°C operating range, no-output-capacitor requirement, and compatibility with high-impedance bias networks in portable and space-constrained systems.

Technical Context

The LM4040C50IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 5.0V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed silicon design achieves tight initial tolerance without external components.

It delivers low dynamic impedance (0.9Ω typical at 1mA), minimal voltage drift over temperature (±100ppm/°C), and thermal hysteresis of only 0.08%, enabling stable reference performance in cyclic thermal environments such as field transmitters and automotive control modules.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for PCB space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040C50IDBZRG4, LM4040C50IDCKR offers identical performance in a smaller footprint but adds unused pins, while MAX6005EUR+T trades off noise and temperature stability for lower unit cost-making each suitable for distinct cost-performance-layout trade-offs.

Availability

LM4040C50IDBZRG4 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, portable data loggers, and process field transmitters requiring stable component supply with guaranteed long-term continuity.

Supply support for LM4040C50IDBZRG4 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 delivering analog and embedded processing solutions with emphasis on reliability, precision, and industrial-grade qualification.

The LM4040 series was designed specifically for high-accuracy, low-power shunt reference applications in data acquisition, sensor interfaces, and portable instrumentation-prioritizing micropower operation, zero-capacitor stability, and robust thermal performance.

FAQ

What is the maximum cathode current rating for LM4040C50IDBZRG4?

The LM4040C50IDBZRG4 has an absolute maximum cathode current rating of 25mA per its datasheet Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA; sustained operation above 15mA may increase self-heating and degrade long-term stability or temperature coefficient performance. Always verify power dissipation (P = 5.0V × IZ) remains within the SOT-23-3 package's thermal limits.

Does LM4040C50IDBZRG4 require an output capacitor for stability?

No, LM4040C50IDBZRG4 does not require an output capacitor. Its internal design ensures stability with all capacitive loads-including 0μF-making it ideal for space-constrained or ultra-low-power applications where minimizing external components is critical. This eliminates capacitor-related aging, leakage, and board-area penalties common with series references.

What is the thermal hysteresis specification for LM4040C50IDBZRG4?

The LM4040C50IDBZRG4 exhibits 0.08% thermal hysteresis, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to 125°C. This low hysteresis ensures repeatable reference accuracy in equipment subjected to repeated ambient temperature swings-such as outdoor industrial controllers or automotive cabin modules-without recalibration.

Can LM4040C50IDBZRG4 be used in automotive applications?

LM4040C50IDBZRG4 is rated for –40°C to +85°C operation and meets industrial temperature requirements. While not AEC-Q200 qualified, its electrical specs-including ±2000V HBM ESD rating and 0.08% thermal hysteresis-support use in non-safety-critical automotive cabin applications like air quality sensors or infotainment auxiliary supplies, provided system-level qualification is performed.

How does the LM4040C50IDBZRG4 differ from the LM4040A50IDBZRG4?

The LM4040C50IDBZRG4 has ±0.5% initial accuracy and 100ppm/°C temperature coefficient, while LM4040A50IDBZRG4 offers tighter ±0.1% accuracy and same 100ppm/°C TC. Both share identical pinout, package, noise (35μVRMS), and operating current range. The C-grade version trades precision for cost efficiency in applications where ±25mV absolute error is acceptable.