Texas Instruments LM4040A30IDCKRE4

Overview

LM4040A30IDCKRE4 from Texas Instruments is a precision micropower shunt voltage reference with 3.0V nominal output, ±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 portable data-acquisition systems.

For engineers reviewing the LM4040A30IDCKRE4 datasheet, LM4040A30IDCKRE4 pinout, LM4040A30IDCKRE4 application, or LM4040A30IDCKRE4 equivalent, key selection criteria include initial voltage tolerance, thermal stability over –40°C to 85°C, low-noise performance at microamp bias, and SC-70 package compatibility with space-constrained PCB layouts.

Technical Context

The LM4040A30IDCKRE4 operates as a two-terminal shunt reference, sinking cathode current to regulate voltage across its terminals without requiring external capacitors. Its Zener-zap trimmed reverse breakdown ensures tight initial tolerance and low dynamic impedance (0.4Ω typical at 1mA).

It delivers stable 3.0V output across cathode currents from 47μA to 15mA and ambient temperatures from –40°C to +85°C (I-grade), with thermal hysteresis limited to 0.08% and long-term stability of 120ppm after 1000 hours.

Key Specifications

Pinout & Package

LM4040A30IDCKRE4 is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00mm × 1.25mm, optimized for high-density PCB layouts. Pin 1 is Anode (ground reference), Pin 3 is Cathode (voltage output terminal), Pins 4 and 5 are No Connect (NC), and Pin 2 is the floating or anode-tied control terminal per TI's EMI mitigation recommendation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040A30IDCKRE4, the LM4040A30IDBZRE4 offers identical electrical performance in a larger, thermally superior SOT-23 package, while REF3030AIDBZR provides lower temperature drift but demands a dedicated supply and cannot replace shunt-based designs without circuit redesign.

Availability

LM4040A30IDCKRE4 is available at Aetrix Electronics and suitable for analog input modules, portable data-acquisition systems, and field transmitters requiring stable component supply with guaranteed long-term availability and traceable lot-level documentation.

Supply support for LM4040A30IDCKRE4 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, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The LM4040 family is designed for precision voltage referencing in space-constrained, low-power systems - emphasizing micropower operation, zero-external-component stability, and grade-scalable accuracy for cost-optimized design flexibility.

FAQ

What is the output voltage tolerance of LM4040A30IDCKRE4 at 25°C?

The LM4040A30IDCKRE4 has a maximum initial output voltage tolerance of ±0.1% at 25°C, corresponding to ±3mV around its 3.0V nominal output. This A-grade specification is verified per TI's SLOS456Q datasheet Section 6.11, with ΔVZ = ±3mV at IZ = 100μA and TA = 25°C. The LM4040A30IDCKRE4 maintains this tight tolerance across its rated industrial temperature range.

Does LM4040A30IDCKRE4 require an output capacitor for stability?

No, the LM4040A30IDCKRE4 is inherently stable with all capacitive loads and does not require an external output capacitor. As confirmed in the TI datasheet Section 3 and Feature list, its internal design eliminates capacitor dependency - simplifying layout and reducing component count. This behavior holds across the full 47μA–15mA cathode current range and –40°C to +85°C temperature range for the LM4040A30IDCKRE4.

What is the minimum cathode current needed for LM4040A30IDCKRE4 to regulate properly?

The LM4040A30IDCKRE4 requires a minimum cathode current of 47μA (typical) at 25°C to maintain regulation, per Section 6.11 of the TI datasheet. At full temperature range (–40°C to +85°C), the guaranteed minimum is 82μA. Below this threshold, output voltage deviates from specification; above it, regulation remains stable up to 15mA. This ultra-low I_Z,min makes the LM4040A30IDCKRE4 suitable for battery-powered applications.

How does the LM4040A30IDCKRE4 handle electromagnetic interference?

The LM4040A30IDCKRE4 includes a dedicated control pin (Pin 2) that TI recommends either floating or connecting directly to the anode (Pin 1) in high-EMI environments - such as near transformers or switching regulators - to suppress noise-induced voltage errors. This design feature is documented in Figure 5-2 and Table 5-1 of the datasheet and applies specifically to the DCK package variant used by the LM4040A30IDCKRE4.

What is the wideband noise performance of LM4040A30IDCKRE4?

The LM4040A30IDCKRE4 delivers 35μVRMS wideband noise over the 10Hz to 10kHz frequency range at 100μA cathode current and 25°C, as specified in Section 6.11 of the TI datasheet. This low-noise characteristic is critical for high-resolution data acquisition systems, where added reference noise directly degrades effective number of bits (ENOB). The LM4040A30IDCKRE4 achieves this without external filtering components.