Texas Instruments LM4040D82IDBZT

Overview

LM4040D82IDBZT from Texas Instruments is a precision micropower shunt voltage reference with 8.192 V nominal output, ±1.0% initial accuracy (D grade), 150 ppm/°C temperature coefficient, 35 μV_RMS wideband noise, and stable operation from 45 μA to 15 mA cathode current - used in high-accuracy analog input modules and field transmitters requiring stable low-power biasing.

For engineers reviewing the LM4040D82IDBZT datasheet, LM4040D82IDBZT pinout, LM4040D82IDBZT application, or LM4040D82IDBZT equivalent, key selection criteria include output tolerance over –40°C to 85°C, dynamic impedance under varying load current, thermal hysteresis performance, and compatibility with capacitive loads without external compensation.

Technical Context

The LM4040D82IDBZT operates as a two-terminal shunt reference, sinking cathode current (I_Z) to maintain a precise 8.192 V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves D-grade accuracy via wafer-level fuse trimming, with no external components required for stability.

It delivers low dynamic impedance (≤1.1 Ω at 1 mA), minimal voltage variation (<10 mV) across 45 μA–15 mA I_Z, and maintains specification over industrial temperature range (–40°C to +85°C). Thermal hysteresis is limited to 0.08%, and long-term stability is 120 ppm after 1000 hours.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm footprint, surface-mount, thermally efficient for compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040C82IDBZT, the LM4040D82IDBZT trades 0.5% accuracy and 50 ppm/°C tempco for lower unit cost and identical SOT-23-3 footprint; versus REF3082AIDBZR, it offers simpler implementation and wider current range but with higher drift and noise - making it optimal for cost-constrained industrial field devices.

Availability

LM4040D82IDBZT is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and data-acquisition systems requiring stable component supply with guaranteed long-term sourcing and consistent parametric performance.

Supply support for LM4040D82IDBZT 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 high-reliability ICs for industrial, automotive, and communications markets.

The LM4040 series was designed specifically for precision shunt reference applications demanding micropower operation, wide current range, and robustness across industrial temperature extremes - with the D grade targeting cost-sensitive, high-volume field instrumentation.

FAQ

What is the maximum cathode current rating for LM4040D82IDBZT?

The absolute maximum cathode current for LM4040D82IDBZT is 25 mA per TI's Absolute Maximum Ratings. However, the recommended operating range is 45 μA to 15 mA. Operating above 15 mA increases self-heating and may degrade long-term stability and tempco performance. The LM4040D82IDBZT is optimized for reliable operation within this 15 mA upper limit.

Does LM4040D82IDBZT require an output capacitor for stability?

No, LM4040D82IDBZT is inherently stable with all capacitive loads and requires no output capacitor. This is confirmed in TI's datasheet Section 3 and Section 8.2, which state "stable with all capacitive loads; no output capacitor required." The device's low dynamic impedance and internal compensation eliminate oscillation risk even with >1 μF ceramic capacitance at the cathode.

What is the thermal hysteresis specification for LM4040D82IDBZT?

The thermal hysteresis of LM4040D82IDBZT is 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, including the DBZ variant. It reflects repeatability after thermal stress - critical for field instruments undergoing repeated ambient cycling.

Can LM4040D82IDBZT operate at 125°C ambient temperature?

No - LM4040D82IDBZT is rated for industrial temperature range only: –40°C to +85°C. The 'I' suffix in the part number (LM4040D82I) explicitly denotes this grade. For operation up to +125°C, TI offers the Q-grade variants (e.g., LM4040D82Q), which are characterized over –40°C to +125°C and carry different orderable part numbers and packaging.

How does the 8.192 V output of LM4040D82IDBZT benefit data-acquisition systems?

The 8.192 V output of LM4040D82IDBZT aligns precisely with binary-scaled full-scale ranges (e.g., 8.192 V = 2¹³ × 1 mV), simplifying gain calibration and reducing quantization error in 13-bit+ ADC systems. When paired with common 2.048 V or 4.096 V references, it supports ratiometric scaling across multi-channel acquisition paths without software correction.