Texas Instruments LMC6482IMMX

Overview

LMC6482IMMX from Texas Instruments is a dual-channel CMOS rail-to-rail input and output operational amplifier designed for precision signal conditioning in low-voltage, single-supply systems. It delivers 82 dB CMRR, 20 fA input bias current, ±0.75 mV max input offset voltage (25°C), rail-to-rail output swing within 20 mV of supply rails (100 kΩ load), and operates across 3 V to 15 V supply range - enabling high-accuracy data acquisition front-ends.

For engineers reviewing the LMC6482IMMX datasheet, LMC6482IMMX pinout, LMC6482IMMX application, or LMC6482IMMX equivalent, key selection criteria include ultra-low input current for high-impedance sensor interfacing, guaranteed rail-to-rail operation over temperature, specified performance at 3 V/5 V/15 V, and compatibility with 600 Ω loads in battery-powered instrumentation.

Technical Context

The LMC6482IMMX employs a proprietary CMOS input stage that extends common-mode voltage range 300 mV beyond both supply rails without phase inversion, unlike Bi-FET amplifiers. Its rail-to-rail output stage maintains <20 mV headroom to rails under 100 kΩ load and sustains usable swing down to 600 Ω.

It achieves 82 dB CMRR and PSRR across 0–15 V common-mode range at 5 V/15 V supplies, with input offset drift limited to ±1 µV/°C (–40°C to +85°C). The device supports dual- and single-supply operation and features 1.5 MHz gain-bandwidth product and 1.3 V/µs slew rate at 15 V.

Key Specifications

Pinout & Package

LMC6482IMMX is supplied in an 8-pin SOIC (D package), with thermal resistance R_θJA = 128.9°C/W. This surface-mount package supports automated assembly and provides stable thermal performance in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision rail-to-rail op amp applications.

Compared with TLV2462IDR and OPA2333AIDR, the LMC6482IMMX uniquely balances rail-to-rail operation, 82 dB CMRR, 20 fA input current, and 1.5 MHz bandwidth - making it optimal for industrial DAQ and medical sensor front-ends where all four parameters are simultaneously critical.

Availability

LMC6482IMMX is available at Aetrix Electronics and suitable for data acquisition systems, medical instrumentation, and industrial process analytics requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LMC6482IMMX 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 delivering analog and embedded processing solutions with deep expertise in precision amplifiers and signal chain ICs.

The LMC6482IMMX belongs to TI's LMC648x rail-to-rail op amp family, engineered specifically for high-accuracy, low-power signal conditioning in single-supply industrial, medical, and test equipment applications.

FAQ

What is the maximum operating supply voltage for LMC6482IMMX?

The LMC6482IMMX has an absolute maximum supply voltage (V_S = V₊ – V₋) of 16 V, with recommended operation from 3 V to 15.5 V. Exceeding 16 V risks permanent damage per Absolute Maximum Ratings. At 15.5 V, it delivers full rail-to-rail output swing into 2 kΩ loads and maintains 82 dB CMRR - critical for high-dynamic-range industrial sensors. Always observe derating guidelines in TI's SNOS674J datasheet for LMC6482IMMX.

Does LMC6482IMMX support true rail-to-rail input beyond the supply rails?

Yes, the LMC6482IMMX supports input common-mode voltage up to 300 mV beyond both V₊ and V₋ rails at room temperature - confirmed in Section 6.3.2 of the datasheet. This prevents phase inversion during overvoltage transients (e.g., ESD events or sensor cable disconnects). However, input offset voltage degrades slightly near rail extremes; design margins should maintain V_CM within (V₋ – 0.25 V) to (V₊ + 0.25 V) for best DC accuracy in LMC6482IMMX.

Can LMC6482IMMX drive a 600 Ω load while maintaining rail-to-rail output?

Yes, the LMC6482IMMX is explicitly specified for 600 Ω loads: at 5 V supply, it delivers ≥4.24 V high swing and ≤0.65 V low swing (–40°C to +85°C), and at 15 V, ≥13 V high and ≤1.3 V low. This capability enables direct interface with analog switches, multiplexers, and legacy 600 Ω audio/test equipment without external buffers - a key differentiator versus many rail-to-rail op amps. Confirm thermal limits using R_θJA = 128.9°C/W for SOIC in LMC6482IMMX.

What is the input bias current specification for LMC6482IMMX across temperature?

The LMC6482IMMX exhibits ±0.02 pA typical input bias current at 25°C, rising to ±4 pA maximum over –40°C to +85°C per Section 5.6. This ultra-low value stems from its CMOS input stage and enables use with >1 GΩ source impedances - essential for pH electrodes, piezoelectric sensors, and capacitive touch interfaces. Unlike JFET op amps, LMC6482IMMX maintains this performance without significant temperature-induced drift, supporting stable calibration in field-deployed instruments.

Is LMC6482IMMX pin-compatible with TLC272 or other legacy TI op amps?

Yes, the LMC6482IMMX uses industry-standard 8-pin SOIC pinout matching TLC272, TLC277, and other dual op amps in D-package - enabling drop-in replacement in existing designs. TI explicitly positions it as an "improved replacement" with enhanced rail-to-rail operation, lower input current (20 fA vs. 1 pA), and superior CMRR (82 dB vs. 70 dB). No PCB changes are required, though layout review is advised to verify stability with capacitive loads due to higher GBW in LMC6482IMMX.