Texas Instruments LM4040D10IDBZT

Overview

LM4040D10IDBZT 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 in SOT-23-3 package. It serves as a low-drift, low-noise voltage基准 in high-resolution ADCs and industrial sensor signal chains.

For engineers reviewing the LM4040D10IDBZT datasheet, LM4040D10IDBZT pinout, LM4040D10IDBZT application, or LM4040D10IDBZT equivalent, key selection criteria include its 10V nominal output, D-grade tolerance and tempco, SOT-23-3 thermal resistance (206°C/W), no-output-capacitor stability, and –40°C to 85°C operating range.

Technical Context

The LM4040D10IDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 10V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves D-grade accuracy without external components.

It exhibits low dynamic impedance (≤1.1Ω at 1mA), minimal voltage drift over cathode current (≤10mV from 45μA to 15mA), and thermal hysteresis of only 0.08% - enabling stable performance in portable and thermally cycling industrial environments.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient (RθJA = 206°C/W), suitable for dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C10IDBZR, LM4040D10IDBZT trades ±0.5% accuracy for lower 45μA minimum current and wider 15mA max current range; versus REF3010AIDBZR, it offers simpler 2-terminal operation but cannot source load current.

Availability

LM4040D10IDBZT is available at Aetrix Electronics and suitable for data-acquisition systems, energy infrastructure monitoring, and analog input modules requiring stable component supply with guaranteed long-term availability.

Supply support for LM4040D10IDBZT 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 family was engineered for cost-sensitive, space-constrained applications demanding micropower operation, low noise, and robust thermal performance - particularly in industrial sensing and portable instrumentation.

FAQ

What is the maximum cathode current rating for LM4040D10IDBZT?

The absolute maximum cathode current for LM4040D10IDBZT is 25mA per Absolute Maximum Ratings, but the recommended operating range is 45μA to 15mA. Operating above 15mA risks exceeding junction temperature limits due to power dissipation (P = 10V × IZ), especially in still-air conditions. For sustained 15mA operation, ensure board-level thermal management per the 206°C/W RθJA spec.

Does LM4040D10IDBZT require an output capacitor for stability?

No, LM4040D10IDBZT 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 external capacitance will not degrade performance but provides no benefit - simplifying layout and reducing component count in compact designs where LM4040D10IDBZT is deployed.

What is the thermal hysteresis specification for LM4040D10IDBZT?

LM4040D10IDBZT 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 10V output in applications subject to repeated thermal cycling, such as outdoor energy meters or automotive cabin sensors - eliminating need for post-thermal recalibration.

Can LM4040D10IDBZT be used in automotive under-hood applications?

LM4040D10IDBZT is rated for –40°C to +85°C ambient operation (I-grade), making it suitable for automotive cabin and infotainment systems, but not under-hood locations exceeding 85°C. For under-hood use, TI offers the Q-grade variant LM4040D10QDBZR (–40°C to +125°C), which shares identical electrical specs but is qualified to AEC-Q100 Grade 3. LM4040D10IDBZT itself is not AEC-Q100 qualified.

How does the 150ppm/°C temperature coefficient translate to actual voltage drift over temperature?

With a 10V nominal output and 150ppm/°C tempco, LM4040D10IDBZT exhibits up to ±15mV/°C drift. Over its full –40°C to +85°C range (ΔT = 125°C), worst-case drift is ±1.875V - but this is bounded by the overtemperature tolerance spec: ±2.5% (±250mV) total for D grade. Real-world drift is typically <±100mV across the range, verified in the Electrical Characteristics tables.