Texas Instruments LM4040A50IDBZTG4

Overview

LM4040A50IDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 5.0V output with ±0.1% initial accuracy (A-grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current - used in high-accuracy analog input modules and data-acquisition systems requiring low-drift, low-noise references.

For engineers reviewing the LM4040A50IDBZTG4 datasheet, LM4040A50IDBZTG4 pinout, LM4040A50IDBZTG4 application, or LM4040A50IDBZTG4 equivalent, key selection criteria include initial voltage tolerance, thermal stability over –40°C to 85°C, dynamic impedance under varying load current, noise performance at 100μA bias, and compatibility with capacitive loads without external compensation.

Technical Context

The LM4040A50IDBZTG4 operates as a two-terminal shunt reference, sinking cathode current to regulate voltage across its terminals. Its Zener-zap trimmed reverse breakdown voltage achieves tight 5.0V output with guaranteed ±0.1% tolerance at 25°C and ±0.75% over –40°C to 85°C ambient range.

It features low dynamic impedance (≤0.8Ω at 1mA), minimal voltage shift vs. cathode current (≤6mV from 1mA to 15mA), and inherent stability with all capacitive loads - eliminating need for output capacitor or series resistance in most applications.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040C50IDBZT, the LM4040A50IDBZTG4 delivers four times tighter initial tolerance and identical thermal hysteresis; versus ADR3450ARJZ-R7, it offers simpler two-terminal implementation but higher tempco and noise - making it optimal for cost-sensitive, space-constrained shunt-reference designs where ±0.1% accuracy is mandatory.

Availability

LM4040A50IDBZTG4 is available at Aetrix Electronics and suitable for analog input modules, energy infrastructure meters, and field transmitters requiring stable component supply with guaranteed long-term availability and traceable lot-level documentation.

Supply support for LM4040A50IDBZTG4 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 and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.

The LM4040 series is designed for high-accuracy, low-power shunt voltage reference applications in industrial automation, test equipment, and energy metering - emphasizing stability, noise performance, and ease of use without external components.

FAQ

What is the operating temperature range for LM4040A50IDBZTG4?

The LM4040A50IDBZTG4 is characterized for operation from –40°C to +85°C ambient temperature. It maintains its specified ±0.1% initial accuracy and 100ppm/°C temperature coefficient across this full industrial temperature range, with overtemperature tolerance of ±0.75% at extremes - verified per TI's LM4040A50I electrical characteristics table.

Does LM4040A50IDBZTG4 require an output capacitor?

No, LM4040A50IDBZTG4 is stable with all capacitive loads and does not require an external output capacitor. Its internal design eliminates oscillation risk even with large bypass caps directly at the cathode, simplifying layout and reducing component count - confirmed in TI's "Stable with all capacitive loads" feature and Figure 8-1 typical application circuit.

What is the minimum cathode current needed for LM4040A50IDBZTG4 to regulate properly?

The LM4040A50IDBZTG4 requires a minimum cathode current of 45μA (typical) to maintain regulation within specifications. At 25°C, regulation is guaranteed down to 45μA; over the full –40°C to 85°C range, minimum required current increases to 80μA - per Section 6.5 and Table 6-17 of the TI LM4040A50I datasheet.

How does LM4040A50IDBZTG4 compare to LM4040B50IDBZT in accuracy?

LM4040A50IDBZTG4 provides ±0.1% initial accuracy, while LM4040B50IDBZT offers ±0.2%. Both share identical 100ppm/°C temperature coefficient and noise performance, but the A-grade part delivers twice the room-temperature tolerance - critical for applications like metrology-grade data acquisition where first-pass calibration margin is constrained.

Is LM4040A50IDBZTG4 RoHS compliant and lead-free?

Yes, LM4040A50IDBZTG4 is RoHS compliant and lead-free. The "G4" suffix in the part number indicates TI's green packaging standard - Pb-free die attach, matte tin lead finish, and halogen-free molding compound - fully compliant with JEDEC J-STD-020 and EU RoHS Directive 2011/65/EU.