Texas Instruments LM4040C10ILPE3

Overview

LM4040C10ILPE3 from Texas Instruments is a precision 10V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°C operation, with ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a stable voltage reference in high-resolution ADCs and industrial sensor signal conditioning circuits.

For engineers reviewing the LM4040C10ILPE3 datasheet, LM4040C10ILPE3 pinout, LM4040C10ILPE3 application, or LM4040C10ILPE3 equivalent, key selection criteria include its C-grade tolerance, low-noise performance at microamp bias, compatibility with all capacitive loads without output capacitor, and SOT-23 footprint suitability for space-constrained analog front-ends.

Technical Context

The LM4040C10ILPE3 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 design achieves tight initial tolerance and low thermal drift without requiring external components.

It delivers stable regulation over cathode currents from 45μA to 15mA and across –40°C to +85°C ambient, with dynamic impedance under 1Ω at 1mA and thermal hysteresis of only 0.08%. The device's no-output-capacitor requirement simplifies layout in low-power portable and isolated sensing systems.

Key Specifications

Pinout & Package

LM4040C10ILPE3 is packaged in a 3-pin SOT-23 (DBZ) case measuring 2.92mm × 1.30mm, with gull-wing leads compatible with standard surface-mount reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C10IDBZR and REF43GM, LM4040C10ILPE3 offers the lowest operating current and smallest SOT-23 footprint, making it optimal for single-point, ultra-low-power reference needs - whereas alternatives trade current efficiency for improved TC or output drive.

Availability

LM4040C10ILPE3 is available at Aetrix Electronics and suitable for data-acquisition systems, industrial analog input modules, and field transmitters requiring stable component supply with guaranteed long-term sourcing and consistent parametric performance.

Supply support for LM4040C10ILPE3 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 leadership in precision analog ICs.

The LM4040 series was designed specifically for cost-sensitive, space-constrained applications demanding high accuracy and low power - targeting industrial sensors, portable instrumentation, and automotive subsystems.

FAQ

What is the maximum cathode current rating for LM4040C10ILPE3?

The absolute maximum cathode current for LM4040C10ILPE3 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 or temperature coefficient performance. For continuous operation, staying within the 15mA limit ensures compliance with the published 100ppm/°C TC and ±0.5% accuracy specs.

Does LM4040C10ILPE3 require an output capacitor for stability?

No, LM4040C10ILPE3 is inherently stable with all capacitive loads and does not require an output capacitor - a key differentiator from many series references. This is confirmed in TI's datasheet Section 3 and Section 8.2, which explicitly state "no output capacitor required" and demonstrate stability across >10µF ceramic and electrolytic loads. Omitting the capacitor reduces BOM count, PCB area, and potential aging-related drift.

What is the thermal hysteresis specification for LM4040C10ILPE3?

LM4040C10ILPE3 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 value is consistent across all LM4040 grades and packages, and is specified in Sections 6.5–6.22 of the datasheet. It reflects minimal memory effect, supporting repeatable calibration in instruments subject to repeated thermal cycling.

Can LM4040C10ILPE3 be used in automotive under-hood applications?

LM4040C10ILPE3 is rated for –40°C to +85°C operation (industrial grade), not the extended –40°C to +125°C range required for most under-hood automotive locations. For such environments, TI's LM4040C10Q (Q-grade, SOT-23) or LM4040C10QMFX (SC70) would be appropriate alternatives - both qualified to –40°C to +125°C and sharing identical electrical specs except for temperature range validation.

How does the 100ppm/°C temperature coefficient translate to actual voltage drift over temperature?

For LM4040C10ILPE3, a 100ppm/°C coefficient means the output voltage can drift up to ±0.001V/°C. Over its full –40°C to +85°C range (ΔT = 125°C), worst-case drift is ±0.125V - but datasheet overtemperature tolerance calculations (Section 6.5 footnote) cap total error at ±1.15% of 10V = ±115mV, including initial tolerance. Real-world drift is typically lower due to parabolic TC behavior and batch-specific trim.