Texas Instruments LM4040D25QDBZRG4

Overview

LM4040D25QDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5 V output with ±1.0% initial accuracy (D grade), 150 ppm/°C temperature coefficient, 35 μV_RMS wideband noise, and operation across –40°C to +125°C. It requires only 45 μA minimum cathode current and remains stable with all capacitive loads-used in high-accuracy analog input modules and automotive sensor signal conditioning.

For engineers reviewing the LM4040D25QDBZRG4 datasheet, LM4040D25QDBZRG4 pinout, LM4040D25QDBZRG4 application, or LM4040D25QDBZRG4 equivalent, key selection criteria include its extended-temperature D-grade tolerance, SOT-23-3 package compatibility, low-noise performance at microamp bias, and absence of required output capacitance in space-constrained designs.

Technical Context

The LM4040D25QDBZRG4 operates as a two-terminal shunt reference, sinking cathode current (I_Z) to regulate voltage across its anode–cathode terminals. Its Zener-zap trimmed reverse breakdown voltage is factory-set to 2.5 V at 100 μA, with dynamic impedance under 1.1 Ω at 1 mA and thermal hysteresis limited to 0.08% over –40°C to +125°C cycling.

It functions without external capacitors and maintains stability across I_Z = 45 μA to 15 mA. The device's low 35 μV_RMS noise (10 Hz–10 kHz) and 120 ppm long-term stability (1000 h) support precision data acquisition where reference drift directly impacts ADC effective resolution.

Key Specifications

Pinout & Package

LM4040D25QDBZRG4 is packaged in a 3-pin SOT-23 (DBZ) case measuring 2.92 mm × 1.30 mm, with gull-wing leads and exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDBZR and MAX6008BAUT25+T, LM4040D25QDBZRG4 offers the only combination of SOT-23-3 packaging, –40°C to +125°C operation, and guaranteed 1.0% initial accuracy-making it optimal for cost-sensitive, space-constrained automotive and industrial designs where absolute temperature robustness is mandatory.

Availability

LM4040D25QDBZRG4 is available at Aetrix Electronics and suitable for analog input modules, automotive electronics, and energy infrastructure applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040D25QDBZRG4 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 company specializing in analog, embedded processing, and digital signal technologies, with leadership in precision analog ICs and automotive-grade components.

The LM4040 series was designed for high-accuracy, low-power shunt voltage referencing in industrial, automotive, and portable measurement systems-emphasizing micropower operation, wide temperature range, and capacitor-free stability.

FAQ

What is the maximum cathode current rating for LM4040D25QDBZRG4?

The absolute maximum cathode current for LM4040D25QDBZRG4 is 25 mA, per TI's Absolute Maximum Ratings table. Continuous operation above 15 mA is not recommended due to thermal limitations in the SOT-23-3 package; sustained currents above this level risk exceeding the 150°C junction temperature limit and degrading long-term stability. For reliable operation, design cathode current between 45 μA and 15 mA.

Does LM4040D25QDBZRG4 require an output capacitor?

No, LM4040D25QDBZRG4 does not require an output capacitor. Its internal design ensures stability with all capacitive loads-including 0 μF-eliminating the need for external bypass or filtering capacitors. This simplifies layout, improves reliability in capacitor-sensitive environments (e.g., high-temperature or high-vibration), and avoids potential instability from capacitor ESR or aging effects.

What is the thermal hysteresis specification for LM4040D25QDBZRG4?

LM4040D25QDBZRG4 has a thermal hysteresis of 0.08%, 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 voltage behavior during repeated thermal excursions-critical for automotive and industrial systems undergoing environmental stress testing or daily thermal cycling.

Can LM4040D25QDBZRG4 be used in place of LM4040C25QDBZRG4?

Yes, LM4040D25QDBZRG4 can replace LM4040C25QDBZRG4 in applications tolerant of ±1.0% initial accuracy instead of ±0.5%. Both share identical 2.5 V nominal output, SOT-23-3 package, –40°C to +125°C rating, and electrical characteristics except initial tolerance and temperature coefficient (150 ppm/°C vs. 100 ppm/°C). No PCB changes are required, but system-level accuracy budget must accommodate the looser tolerance.

What is the long-term stability of LM4040D25QDBZRG4 after 1000 hours?

LM4040D25QDBZRG4 exhibits 120 ppm long-term stability after 1000 hours of operation at 25°C with 100 μA cathode current. This means the output voltage drift is bounded within ±0.012% of 2.5 V (±300 μV) over that period-supporting designs requiring minimal recalibration in field-deployed instrumentation and energy metering equipment.