Texas Instruments LMC6084IMX

Overview

LMC6084IMX from Texas Instruments is a precision quad CMOS operational amplifier optimized for ultra-low-input-bias-current, single-supply instrumentation circuits. It delivers 150 µV typical offset voltage, 10 fA typical input bias current, rail-to-rail output swing within 20 mV of supply rails (at 2 kΩ), and 123 dB open-loop gain - enabling high-accuracy signal conditioning in medical sensors, photodiode preamps, and piezoelectric charge amplifiers.

For engineers reviewing the LMC6084IMX datasheet, LMC6084IMX pinout, LMC6084IMX application, or LMC6084IMX equivalent, this page provides verified specifications, SOIC-14 package mapping, channel-specific pin functions, real-world application context for low-leakage analog front-ends, and two validated alternative parts with documented functional and layout implications.

Technical Context

The LMC6084IMX employs a proprietary CMOS input stage with guarded differential pair architecture to achieve 10 fA input bias current and input common-mode range extending to V–. Its output stage uses complementary rail-to-rail drive with internal compensation tuned for stability with capacitive loads up to 100 pF when paired with ≥600 Ω resistive load.

It operates from 4.5 V to 15.5 V single supply (or ±2.25 V to ±7.75 V dual supply), supports full 0 V to V+ input common-mode range, and maintains >60 dB CMRR across 0–12 V VCM at 15 V supply - critical for bridge sensor interfaces and precision transducer amplification.

Key Specifications

Pinout & Package

LMC6084IMX is housed in a 14-pin SOIC (D package) with exposed pad not electrically connected. The device integrates four independent amplifiers sharing common V+ and V– supplies. Pin numbering follows JEDEC MS-012 standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision low-input-bias-current amplifier applications.

Compared with LMC6084IMX, OPA2182IDR offers superior bandwidth and drift performance at higher power cost, while ADA4522-2ARZ delivers near-zero drift but sacrifices 300× higher input bias current - making LMC6084IMX uniquely suited for high-impedance, moderate-bandwidth, low-power precision sensing.

Availability

LMC6084IMX is available at Aetrix Electronics and suitable for medical instrumentation, photodiode preamplification, and piezoelectric charge amplification requiring stable component supply across production lifecycles.

Supply support for LMC6084IMX 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 and embedded processing technologies, with over 50 years of op-amp innovation and broad industrial qualification.

The LMC608x family was designed specifically for ultra-high-impedance, low-power precision analog signal conditioning in battery-operated medical, scientific, and sensor interface applications - prioritizing input bias current, offset voltage, and single-supply usability.

FAQ

What is the maximum capacitive load the LMC6084IMX can drive without oscillation?

The LMC6084IMX remains stable driving up to 100 pF when a ≥600 Ω resistor is placed in series with the output. This configuration preserves ≥50° phase margin per TI's Figure 5-22 and Figure 5-23. Direct capacitive loading (no series resistor) degrades phase margin and may cause ringing or oscillation - always use the recommended RC isolation network for anti-aliasing filters or cable-driven outputs.

Does the LMC6084IMX support true rail-to-rail input common-mode range?

The LMC6084IMX supports rail-to-rail output swing but its input common-mode range extends to V– (including ground) and up to (V+) – 1.9 V - not the positive rail. At 5 V supply, inputs operate from 0 V to 3.1 V; at 15 V supply, from 0 V to 13.1 V. This design enables single-supply operation with grounded sensors while maintaining low input bias current across the valid range.

How does the LMC6084IMX handle input protection against ESD and overvoltage?

The LMC6084IMX features ±2000 V HBM ESD rating per ANSI/ESDA/JEDEC JS-001 and absolute maximum ratings allowing ±0.3 V beyond supply rails on input pins. However, it lacks integrated clamping diodes - external series resistors (≥1 kΩ) and TVS diodes are recommended for field-deployed equipment exposed to >500 V transients, especially in industrial sensor nodes.

Can the LMC6084IMX be used in dual-supply configurations?

Yes - the LMC6084IMX operates from ±2.25 V to ±7.75 V dual supply, with specified performance across –40°C to +85°C. Its input common-mode range includes V–, and output swings within 20 mV of both rails. Dual-supply use improves headroom for bipolar signal handling and reduces common-mode rejection errors in symmetric bridge applications.

What is the quiescent current per amplifier channel in the LMC6084IMX?

The LMC6084IMX draws 0.55–0.85 mA per amplifier at 15 V supply and 25°C, rising to ≤1 mA over –40°C to +85°C. Total device supply current is ~3.4 mA at 25°C (4 × 0.85 mA), making it suitable for always-on sensor nodes powered by coin cells or energy-harvesting systems with µA-level average current budgets.