Texas Instruments LM4040D10ILP

Overview

LM4040D10ILP from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 10V output with ±1.0% initial accuracy (D grade), 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a low-drift, low-noise voltage基准 in high-accuracy analog signal chains for industrial sensing and data acquisition.

For engineers reviewing the LM4040D10ILP datasheet, LM4040D10ILP pinout, LM4040D10ILP application, or LM4040D10ILP equivalent, key selection criteria include its 10V fixed output, D-grade tolerance and tempco, SC-70 package footprint, cathode/anode terminal configuration, and compatibility with capacitive loads without external compensation.

Technical Context

The LM4040D10ILP operates as a two-terminal shunt reference, sinking cathode current to maintain a precise 10V reverse breakdown voltage across its terminals. Its Zener-zap trimmed bandgap core achieves 150ppm/°C max temperature coefficient and supports operation from –40°C to 85°C ambient.

It requires no output capacitor, exhibits 0.3Ω typical dynamic impedance at 1mA, and delivers 35μVRMS noise over 10Hz–10kHz - enabling direct use in high-resolution ADC references and precision transducer excitation circuits without additional filtering.

Key Specifications

Pinout & Package

LM4040D10ILP is packaged in a 5-pin SC-70 (DCK) package with nominal dimensions 2.00mm × 1.25mm. Pin 1 is Anode (ground reference), Pin 3 is Cathode (voltage output node), Pins 4 and 5 are No Connect (NC). Pin 2 is the "*" terminal, which must float or be tied to Anode per TI layout guidance for EMI-sensitive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C10IDBZR and REF3010AIDBZR, LM4040D10ILP offers the smallest footprint (SC-70), lowest system-level component count (no capacitor required), and optimal balance of cost and industrial-grade stability - making it preferred for space-constrained, capacitive-load-tolerant designs.

Availability

LM4040D10ILP is available at Aetrix Electronics and suitable for energy infrastructure monitoring, analog input modules, field transmitters, and precision audio systems requiring stable component supply across extended production lifecycles.

Supply support for LM4040D10ILP 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 reference design.

The LM4040 family was engineered for high-accuracy, low-power shunt reference applications in industrial, test & measurement, and portable instrumentation - prioritizing ease of use, capacitive-load immunity, and grade-scalable performance.

FAQ

What is the maximum cathode current rating for LM4040D10ILP?

The absolute maximum cathode current for LM4040D10ILP is 25mA, per TI's Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA. Exceeding 15mA may increase self-heating and degrade long-term stability; sustained operation above 25mA risks permanent damage. Always verify power dissipation (P = 10V × I_Z) against thermal limits in your PCB layout.

Does LM4040D10ILP require an output capacitor for stability?

No, LM4040D10ILP is explicitly designed to be stable with all capacitive loads and does not require an output capacitor. This is confirmed in the device description and Feature list. Adding one provides no benefit and may introduce unwanted phase shift in feedback loops - a key differentiator from many competing shunt references that mandate minimum capacitance.

What is the function of Pin 2 (* terminal) on LM4040D10ILP?

Pin 2 on LM4040D10ILP is a dedicated EMI mitigation terminal marked "*". Per TI's datasheet, it must either float or be connected directly to the Anode (Pin 1). This connection is recommended only in high-EMI environments - such as near transformers or switching regulators - to suppress noise coupling into the reference node. Leaving it unconnected is standard practice in most applications.

How does the 150ppm/°C temperature coefficient of LM4040D10ILP impact system accuracy over temperature?

With a 10V output and 150ppm/°C tempco, LM4040D10ILP contributes up to ±15mV drift over a 100°C span (e.g., –40°C to +60°C). At 85°C ambient, total error remains within ±19mV (±0.19%) including initial tolerance - verified in TI's overtemperature tolerance calculation. This makes LM4040D10ILP suitable for Class 0.5 industrial metering and non-critical calibration tasks where active compensation isn't feasible.

Can LM4040D10ILP be used in place of LM4040C10ILP?

Yes, LM4040D10ILP can substitute for LM4040C10ILP in applications tolerant of ±1.0% initial accuracy and 150ppm/°C tempco instead of ±0.5% and 100ppm/°C. The pinout, package, and electrical interface are identical. However, system-level accuracy verification is required - especially in high-resolution ADC references or factory-calibrated instruments where the looser D-grade specs may exceed error budgets.