Texas Instruments LM4040C10ILPR

Overview

LM4040C10ILPR from Texas Instruments is a precision 10V shunt voltage reference in SOT-23-3 (DBZ) package, delivering ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, stable operation from 45μA to 15mA cathode current, and rated for –40°C to 85°C ambient. It serves as a stable voltage reference in high-resolution ADC/DAC biasing, industrial sensor signal conditioning, and programmable power supply feedback loops.

For engineers reviewing the LM4040C10ILPR datasheet, LM4040C10ILPR pinout, LM4040C10ILPR application, or LM4040C10ILPR equivalent, key selection criteria include guaranteed 10V output tolerance at 25°C and full temperature range, low dynamic impedance (<0.9Ω), no external capacitor requirement, and compatibility with capacitive loads across portable and industrial designs.

Technical Context

The LM4040C10ILPR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 10V reverse breakdown voltage (VZ) across its terminals. Its Zener-zap trimmed silicon die ensures fixed 10V output without external components, while fuse-based trimming enables C-grade (±0.5%) accuracy.

It exhibits low thermal hysteresis (0.08%), long-term stability of 120ppm over 1000 hours, and maintains regulation down to 45μA typical minimum cathode current - enabling micropower operation in battery-powered instrumentation and remote sensors.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3010AIDBZR, LM4040C10ILPR trades 0.3% accuracy and 10ppm/°C TC for 5μA lower minimum current - favoring ultra-low-power field devices. Against TL431CDBZR, it delivers 0.5× the output tolerance and 22× lower min current, making it preferable for fixed 10V, battery-critical applications.

Availability

LM4040C10ILPR is available at Aetrix Electronics and suitable for data-acquisition systems, industrial analog input modules, and field transmitter designs requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for LM4040C10ILPR 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 voltage references and industrial-grade ICs.

The LM4040 family was designed specifically for cost-sensitive, space-constrained applications needing micropower, high-accuracy shunt references - targeting portable instrumentation, sensor interfaces, and programmable logic controller (PLC) analog I/O.

FAQ

What is the maximum cathode current rating for LM4040C10ILPR?

The absolute maximum cathode current for LM4040C10ILPR is 25mA, per TI's Absolute Maximum Ratings. 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 = V_Z × I_Z) remains within thermal limits for the SOT-23-3 package.

Does LM4040C10ILPR require an output capacitor for stability?

No, LM4040C10ILPR does not require an output capacitor. It is explicitly designed to be stable with all capacitive loads, including 0μF. This eliminates board space, BOM cost, and layout sensitivity associated with capacitor selection and placement - a key advantage over series references or older shunt devices. TI confirms stability across 0–10μF load capacitance in the datasheet.

Can LM4040C10ILPR be used in automotive applications?

LM4040C10ILPR is rated for –40°C to +85°C, meeting standard industrial temperature requirements but not AEC-Q200 or extended automotive temperature grades (–40°C to +125°C). While functionally capable in cabin-located modules, it lacks automotive qualification. For automotive use, consider the LM4040C10Q (Q-grade, –40°C to +125°C) or alternatives like MAX6010AESA+.

How does the NC pin (Pin 3) on LM4040C10ILPR affect circuit performance?

Pin 3 of LM4040C10ILPR is a no-connect terminal with no internal bond wire. TI specifies it must remain floating or be connected to the anode (Pin 2); tying it to any other potential may cause unpredictable behavior. Leaving it unconnected has zero impact on regulation, noise, or accuracy - it exists solely for package compatibility across the LM4040 family and must not be assumed functional.

What is the long-term stability specification for LM4040C10ILPR?

LM4040C10ILPR exhibits 120ppm long-term stability after 1000 hours of operation at 25°C with 100μA cathode current. This equates to ±1.2mV drift on the 10V output. The value is measured under controlled conditions and reflects typical parametric shift; actual field drift is often lower. For mission-critical calibration systems, periodic recalibration intervals should account for this drift budget.