Texas Instruments LM4040A10IDBZRG4

Overview

LM4040A10IDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 10V output with ±0.1% initial accuracy (A-grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a high-stability voltage reference in analog-to-digital converters and sensor signal conditioning circuits.

For engineers reviewing the LM4040A10IDBZRG4 datasheet, LM4040A10IDBZRG4 pinout, LM4040A10IDBZRG4 application, or LM4040A10IDBZRG4 equivalent, key selection criteria include initial tolerance, thermal drift over –40°C to 85°C, low-noise performance at microamp bias, and SOT-23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The LM4040A10IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current to maintain a precise 10V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon junction achieves A-grade 0.1% accuracy at 25°C and maintains stability via low dynamic impedance (≤0.8Ω) and minimal voltage change (<8mV) across 1mA–15mA operating current.

Designed for industrial-temperature operation (–40°C to +85°C), it exhibits 100ppm/°C max temperature coefficient and 0.08% thermal hysteresis after cycling between –40°C and +125°C. No external capacitor is required, and it remains stable with all capacitive loads - enabling direct integration into precision data-acquisition front-ends.

Key Specifications

Pinout & Package

LM4040A10IDBZRG4 is packaged in a 3-pin SOT-23 (DBZ) surface-mount package measuring 2.92mm × 1.30mm. The device uses a two-terminal shunt topology with an optional third terminal for EMI mitigation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3010AIDBZR and ADR3410ARJZ-R7, LM4040A10IDBZRG4 offers true shunt operation with no minimum supply headroom, 45μA startup current, and identical 0.1% accuracy - making it optimal for low-voltage, low-power, or retrofit applications where layout changes are constrained.

Availability

LM4040A10IDBZRG4 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 manufacturability.

Supply support for LM4040A10IDBZRG4 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.

The LM4040 series was designed specifically for high-accuracy, low-power shunt voltage referencing in industrial, test-and-measurement, and sensor interface applications - prioritizing stability, noise performance, and ease of use over wide temperature ranges.

FAQ

What is the maximum cathode current rating for LM4040A10IDBZRG4?

The absolute maximum cathode current for LM4040A10IDBZRG4 is 25mA, per TI's Absolute Maximum Ratings. However, the recommended operating range is 45μA to 15mA. Operating continuously above 15mA risks exceeding the 150°C junction temperature limit due to power dissipation (P = 10V × I_Z), especially in still-air conditions with the SOT-23 package's 206°C/W junction-to-ambient thermal resistance.

Does LM4040A10IDBZRG4 require an output capacitor for stability?

No, LM4040A10IDBZRG4 does not require an output capacitor for stability. Its internal design ensures unconditional stability with all capacitive loads, including direct connection to ADC input capacitors or op-amp feedback networks. This eliminates capacitor-related drift, aging, and board-space overhead - a key advantage over many series references.

What is the thermal hysteresis specification for LM4040A10IDBZRG4?

The thermal hysteresis of LM4040A10IDBZRG4 is 0.08%, defined as the voltage difference measured at 25°C after thermal cycling from –40°C versus after cycling from +125°C. This low hysteresis ensures repeatable reference accuracy during repeated temperature excursions in field-deployed equipment such as process transmitters and grid-edge sensors.

Can LM4040A10IDBZRG4 be used in automotive applications?

LM4040A10IDBZRG4 is specified for –40°C to +85°C operation and is not AEC-Q200 qualified. While it may function in some non-safety-critical automotive subsystems (e.g., cabin comfort sensors), TI does not recommend or qualify it for under-hood or safety-relevant applications. For automotive use, consider the LM4040-Q1 series (e.g., LM4040A10QDBZRQ1), which is explicitly qualified to AEC-Q100 Grade 3.

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

With a 100ppm/°C coefficient and 10V nominal output, LM4040A10IDBZRG4 drifts by up to 1mV per °C. Over its full –40°C to +85°C range (ΔT = 125°C), maximum drift is ±125mV relative to 25°C - but the datasheet guarantees total overtemperature tolerance of ±0.75% (±75mV) for A-grade devices, combining initial error and tempco effects per TI's published formula.