Texas Instruments LM4040D20ILPRE3

Overview

LM4040D20ILPRE3 from Texas Instruments is a precision micropower shunt voltage reference with 2.048V nominal output, ±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 compact, low-noise voltage基准 in analog input modules and field transmitters requiring high stability over –40°C to 85°C.

For engineers reviewing the LM4040D20ILPRE3 datasheet, LM4040D20ILPRE3 pinout, LM4040D20ILPRE3 application, or LM4040D20ILPRE3 equivalent, this page delivers verified specifications, package mapping to SOT-23-3 (DBZ), functional pin roles, real-world use cases in energy infrastructure and automotive electronics, and two validated alternative parts with documented technical differences.

Technical Context

The LM4040D20ILPRE3 operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.048V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves ±20mV (±1.0%) tolerance at 25°C and supports operation across –40°C to 85°C without external capacitors.

It exhibits low dynamic impedance (≤1.1Ω at 1mA), minimal voltage drift versus load (≤10mV over 1mA–15mA), and thermal hysteresis of 0.08% - enabling stable performance in portable and industrial systems where supply headroom is constrained and long-term calibration integrity is critical.

Key Specifications

Pinout & Package

LM4040D20ILPRE3 is packaged in a 3-pin SOT-23 (DBZ) case measuring 2.92mm × 1.30mm, optimized for space-constrained PCB layouts in portable instrumentation and automotive control units.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040D20ILPRE3, TL4050C20IDBZR offers tighter accuracy and TC at moderate cost increase, while MAX6008AEUR+T provides best-in-class stability in smallest footprint but sacrifices 33% max current - making LM4040D20ILPRE3 optimal for cost-sensitive, medium-accuracy industrial applications needing 15mA drive.

Availability

LM4040D20ILPRE3 is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and energy infrastructure systems requiring stable component supply with guaranteed long-term sourcing and consistent parametric performance.

Supply support for LM4040D20ILPRE3 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 with emphasis on reliability, longevity, and industrial-grade qualification.

The LM4040 series was designed specifically for precision voltage referencing in space-constrained, low-power industrial and automotive systems - prioritizing micropower operation, capacitor-free stability, and robust thermal performance.

FAQ

What is the maximum cathode current rating for LM4040D20ILPRE3?

The LM4040D20ILPRE3 has an absolute maximum cathode current rating of 25mA per its datasheet Absolute Maximum Ratings table. However, the recommended operating condition specifies a maximum of 15mA to ensure thermal stability and long-term reliability within the rated junction temperature limit of 150°C. Operating near 25mA risks exceeding thermal limits in standard SOT-23 PCB layouts without enhanced copper pour.

Does LM4040D20ILPRE3 require an output capacitor for stability?

No, LM4040D20ILPRE3 does not require an output capacitor. Its internal design ensures stability with all capacitive loads, including direct connection to ADC reference inputs or op-amp feedback networks up to 100nF. This eliminates BOM cost and PCB area typically needed for decoupling in shunt references, simplifying layout in compact sensor nodes.

What is the thermal hysteresis specification for LM4040D20ILPRE3?

The LM4040D20ILPRE3 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 low hysteresis ensures repeatable calibration points across thermal cycles - critical for field instruments that undergo repeated environmental stress without recalibration.

Can LM4040D20ILPRE3 operate down to 45μA cathode current while maintaining accuracy?

Yes, LM4040D20ILPRE3 is specified to operate with a minimum cathode current of 45μA (typical) and maintains its ±1.0% initial accuracy and 150ppm/°C temperature coefficient across the full –40°C to 85°C range at this current. At 45μA, dynamic impedance rises slightly, but output voltage remains within datasheet tolerance bands for precision battery-powered applications.

Is LM4040D20ILPRE3 qualified for automotive applications?

LM4040D20ILPRE3 is not AEC-Q100 qualified. It is rated for the industrial temperature range (–40°C to +85°C) and intended for general-purpose industrial and commercial systems. For automotive use, TI offers the LM4040-Q1 variant (e.g., LM4040D20QDBZRQ1), which undergoes full AEC-Q100 stress testing and is qualified for Grade 3 (–40°C to +125°C) operation.