Texas Instruments LM4040A30IDBZRG4

Overview

LM4040A30IDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 3.0V output with ±0.1% initial accuracy (A-grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 47μA to 15mA cathode current - used in high-accuracy analog input modules and data-acquisition front-ends.

For engineers reviewing the LM4040A30IDBZRG4 datasheet, LM4040A30IDBZRG4 pinout, LM4040A30IDBZRG4 application, or LM4040A30IDBZRG4 equivalent, key selection criteria include industrial-temperature operation (–40°C to +85°C), SOT-23-3 package compatibility, low dynamic impedance (0.4Ω typ.), and no-output-capacitor-required stability across capacitive loads.

Technical Context

The LM4040A30IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to regulate voltage across its anode-cathode terminals. Its Zener-based architecture uses wafer-level fuse and Zener-zap trimming for tight initial tolerance, with thermal hysteresis limited to 0.08% over –40°C to 125°C cycling.

It maintains regulation under varying load conditions via low dynamic impedance (0.4Ω typical at 1mA) and exhibits minimal voltage drift with cathode current - ΔVZ ≤ 0.8mV for IZ < 1mA and ≤6mV for 1mA < IZ < 15mA - enabling stable biasing in low-power sensor signal chains and ADC reference buffers.

Key Specifications

Pinout & Package

LM4040A30IDBZRG4 is packaged in a 3-pin SOT-23 (DBZ) surface-mount package measuring 2.92mm × 1.30mm. The device has no internal power supply pin and functions as a two-terminal shunt element, with pin 3 serving as a floating or anode-connected terminal per EMI mitigation guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040B30IDBZR, the LM4040A30IDBZRG4 delivers twice the initial accuracy at identical package and footprint; versus REF3030AIDBZR, it offers lower minimum operating current and simpler two-terminal implementation but trades off temperature coefficient performance.

Availability

LM4040A30IDBZRG4 is available at Aetrix Electronics and suitable for analog input modules, data-acquisition systems, and energy infrastructure applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for LM4040A30IDBZRG4 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 belongs to TI's precision voltage reference product line, engineered for high-accuracy, low-drift, and micropower operation in industrial sensing, test equipment, and energy metering applications.

FAQ

What is the operating temperature range for LM4040A30IDBZRG4?

The LM4040A30IDBZRG4 is characterized for operation across the industrial temperature range of –40°C to +85°C. This specification is confirmed in Section 6.11 of the official TI datasheet (SLOS456Q), where electrical characteristics are explicitly tabulated for the LM4040A30I variant under full-range TA = –40°C to 85°C conditions. The 'I' suffix in the part number denotes this industrial grade.

Does LM4040A30IDBZRG4 require an output capacitor?

No, LM4040A30IDBZRG4 does not require an output capacitor. As stated in the Features section and Detailed Description of the TI datasheet, the device is stable with all capacitive loads and designed for zero-output-capacitor operation. This eliminates external component count and simplifies PCB layout - a key advantage over many series references that mandate specific output capacitance for stability.

What is the minimum cathode current needed for regulation in LM4040A30IDBZRG4?

The LM4040A30IDBZRG4 requires a minimum cathode current of 47μA at 25°C to maintain regulation, as specified in Table 6.11 of the TI datasheet. Over the full industrial temperature range (–40°C to +85°C), the maximum minimum current rises to 82μA. This micropower requirement enables use with high-value bias resistors in battery-operated or energy-harvesting systems.

How does the pin configuration of LM4040A30IDBZRG4 differ from standard 3-pin SOT-23 devices?

The LM4040A30IDBZRG4 uses a nonstandard 3-pin SOT-23 (DBZ) pinout: Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is NC (no internal connection). Unlike conventional ICs, it functions as a two-terminal shunt device - Pin 3 must either float or connect to Pin 2 (Anode) per TI's EMI mitigation recommendation. This differs from typical active ICs where all pins serve defined signal/power functions.

Is LM4040A30IDBZRG4 RoHS compliant and lead-free?

Yes, LM4040A30IDBZRG4 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 JS-001 and EU RoHS Directive 2011/65/EU. This is verified in TI's official Package Information and Environmental Documentation for the DBZ package.