Texas Instruments LM4040D50ILPRE3

Overview

LM4040D50ILPRE3 from Texas Instruments is a precision micropower shunt voltage reference with 5.0V 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-drift voltage reference in analog input modules and field transmitters requiring high stability over –40°C to 85°C.

For engineers reviewing the LM4040D50ILPRE3 datasheet, LM4040D50ILPRE3 pinout, LM4040D50ILPRE3 application, or LM4040D50ILPRE3 equivalent, this page delivers verified specifications, package mapping to SOT-23-3 (DBZ), functional pin definitions, real-world use cases in energy infrastructure and automotive electronics, and two validated alternative parts with documented technical and application differences.

Technical Context

The LM4040D50ILPRE3 operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 5.0V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves D-grade tolerance and uses no external capacitors-stable with all capacitive loads due to low dynamic impedance (≤1.1Ω at 1mA) and inherent phase margin.

It functions within a fixed industrial temperature range (–40°C to +85°C), with thermal hysteresis of 0.08% and long-term stability of 120ppm after 1000 hours. The device's low 45μA minimum operating current enables use in battery-powered portable instrumentation without compromising accuracy.

Key Specifications

Pinout & Package

LM4040D50ILPRE3 is packaged in a 3-pin SOT-23 (DBZ) case measuring 2.92mm × 1.30mm. This surface-mount package supports automated assembly and offers thermal resistance of 206°C/W (junction-to-ambient).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C50IDBZR and MAX6005BESA+, the LM4040D50ILPRE3 trades initial accuracy and temperature stability for lower minimum operating current and smaller SOT-23 footprint-making it optimal for space-constrained, ultra-low-power industrial sensors where ±1.0% system gain error is acceptable.

Availability

LM4040D50ILPRE3 is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and energy infrastructure applications requiring stable component supply with guaranteed long-term sourcing and traceable manufacturing.

Supply support for LM4040D50ILPRE3 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, embedded processing, and connectivity technologies with decades of precision reference design heritage.

The LM4040 series was engineered for cost-sensitive, space-constrained applications demanding stable voltage references without external components-targeting industrial automation, test equipment, and portable instrumentation.

FAQ

What is the maximum cathode current rating for LM4040D50ILPRE3?

The absolute maximum cathode current for LM4040D50ILPRE3 is 25mA, but the recommended operating range is 45μA to 15mA. Exceeding 15mA risks exceeding the device's power dissipation limit in SOT-23 packaging, especially above 25°C ambient. At 15mA and 5.0V, power dissipation reaches 75mW-within safe limits given its 206°C/W thermal resistance.

Does LM4040D50ILPRE3 require an output capacitor for stability?

No, LM4040D50ILPRE3 does not require an output capacitor. Its internal design ensures stability with all capacitive loads-including PCB trace capacitance and ADC input capacitance-eliminating the need for external bypass components. This simplifies layout and reduces bill-of-materials cost in space-constrained designs.

What is the thermal hysteresis specification for LM4040D50ILPRE3?

The thermal hysteresis of LM4040D50ILPRE3 is 0.08%, defined as the voltage difference measured at 25°C after cycling from –40°C versus after cycling from +125°C. This low hysteresis ensures repeatable reference performance during thermal cycling in field-deployed equipment such as remote monitoring nodes.

Can LM4040D50ILPRE3 be used in automotive applications?

LM4040D50ILPRE3 is rated for –40°C to +85°C operation and is commonly used in automotive cabin and body-control modules. However, it is not AEC-Q200 qualified. For under-hood applications requiring AEC-Q200 Grade 1 (–40°C to +125°C), consider the LM4040D50Q variant instead.

How does the 150ppm/°C temperature coefficient affect system accuracy over temperature?

With a 150ppm/°C coefficient and 5.0V nominal output, LM4040D50ILPRE3 contributes up to ±750μV/°C drift. Over the full –40°C to +85°C range (125°C ΔT), this yields ±93.75mV (±1.875%) additional error beyond initial ±1.0% tolerance-resulting in a worst-case total output variation of ±2.875% across temperature, as confirmed in TI's overtemperature tolerance calculations.