Texas Instruments LM4040C30IDBZRG4

Overview

LM4040C30IDBZRG4 from Texas Instruments is a precision 3.0V shunt voltage reference in SOT-23-3 (DBZ) package, rated for industrial temperature range (–40°C to +85°C), with ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a low-power, high-stability reference in analog-to-digital converters and sensor signal conditioning circuits.

For engineers reviewing the LM4040C30IDBZRG4 datasheet, LM4040C30IDBZRG4 pinout, LM4040C30IDBZRG4 application, or LM4040C30IDBZRG4 equivalent, key selection criteria include output tolerance over temperature, minimum operating current, dynamic impedance at 1mA, thermal hysteresis, and compatibility with capacitive loads without external compensation.

Technical Context

The LM4040C30IDBZRG4 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 bandgap core delivers stable regulation independent of supply variations, with low dynamic impedance (0.4Ω typical at 1mA) enabling fast transient response in feedback loops.

Designed for minimal external components, it requires no output capacitor and remains stable under all capacitive load conditions. The C-grade variant targets cost-sensitive industrial applications where ±0.5% initial accuracy and 100ppm/°C drift are sufficient, balancing performance and BOM simplicity.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040C30IDBZRG4, LM4040C30IDCKR offers identical performance in a smaller footprint but adds two unused pins, while MAX6003EUR+T trades lower noise and current efficiency for broader vendor availability-making the original optimal for noise-critical, low-power industrial sensing.

Availability

LM4040C30IDBZRG4 is available at Aetrix Electronics and suitable for industrial data-acquisition systems, field transmitters, and analog input modules requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for LM4040C30IDBZRG4 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 analog ICs and industrial-grade reliability.

The LM4040 series was designed specifically for cost-sensitive, space-constrained industrial and instrumentation applications requiring micropower operation, high initial accuracy, and robust thermal stability without external compensation.

FAQ

What is the maximum cathode current rating for LM4040C30IDBZRG4?

The absolute maximum cathode current for LM4040C30IDBZRG4 is 25mA, as specified in the Absolute Maximum Ratings table. Continuous operation above 15mA is not recommended due to thermal limitations in the SOT-23-3 package; typical design practice limits IZ to ≤10mA to maintain junction temperature within safe margins under worst-case ambient conditions. LM4040C30IDBZRG4 must be used with appropriate series resistance to enforce this limit.

Does LM4040C30IDBZRG4 require an output capacitor for stability?

No, LM4040C30IDBZRG4 is inherently stable with all capacitive loads and does not require an output capacitor. This is confirmed in both the Features list and Detailed Description section of the datasheet. Adding external capacitance will not degrade performance and may even improve noise rejection in certain EMI-heavy environments-but it is never mandatory. LM4040C30IDBZRG4 achieves this via internal compensation optimized for shunt topology.

What is the thermal hysteresis specification for LM4040C30IDBZRG4?

LM4040C30IDBZRG4 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 value is consistent across all LM4040 grades and packages, and reflects the mechanical stress memory in the silicon die. For LM4040C30IDBZRG4, this translates to ≤±2.4mV hysteresis error on the 3.0V output, critical for repeatable calibration in field-deployed equipment.

Can LM4040C30IDBZRG4 operate at –40°C ambient temperature?

Yes, LM4040C30IDBZRG4 is fully characterized and guaranteed to operate across –40°C to +85°C ambient temperature. Its electrical specifications-including output voltage, tempco, and dynamic impedance-are validated over this full industrial range. The "I" suffix in the part number explicitly denotes industrial temperature qualification, and LM4040C30IDBZRG4 meets all parameters in Table 6.12 under those conditions.

What is the long-term stability of LM4040C30IDBZRG4 after 1000 hours?

LM4040C30IDBZRG4 exhibits 120ppm long-term stability after 1000 hours of operation at 25°C with 100μA cathode current. This equates to a maximum drift of ±0.36mV on the 3.0V output, representing excellent aging performance for a shunt reference. The test condition matches JEDEC JESD22-A117 standard, and this value applies identically to all LM4040C-grade variants including LM4040C30IDBZRG4.