Texas Instruments LMC662AIM-TI

Overview

LMC662AIM-TI from Texas Instruments (formerly National Semiconductor) is a CMOS dual operational amplifier optimized for single-supply operation from +5V to +15V, delivering rail-to-rail output swing and input common-mode range extending to V−. It features ultra-low input bias current (2 fA), low input offset voltage (3 mV), high open-loop gain (126 dB into 2 kΩ), and 1.1 V/µs slew rate - enabling precision signal conditioning in high-impedance sensor interfaces and medical instrumentation.

For engineers reviewing the LMC662AIM-TI datasheet, LMC662AIM-TI pinout, LMC662AIM-TI application, or LMC662AIM-TI equivalent, key selection criteria include guaranteed rail-to-rail output performance at 600 Ω load, −40°C to +85°C industrial temperature rating, SOIC-8 packaging, and compatibility with low-leakage sample-and-hold and current-to-voltage converter topologies requiring sub-picoampere bias current.

Technical Context

The LMC662AIM-TI employs a compound integrator-based output stage-bypassing traditional unity-gain buffers-to achieve true rail-to-rail swing while maintaining stability under 600 Ω loads. Its topology includes dual feed-forward compensation (C_f and C_ff) and push-pull sourcing/sinking capability, yielding asymmetric large-signal gain: ≥220 V/mV (sourcing) and ≥100 V/mV (sinking) at 600 Ω.

Input stage uses double-poly silicon-gate CMOS, delivering >1 TΩ input resistance and 0.002 pA typical input bias current. DC performance is specified across −40°C to +85°C (LMC662AI grade), with input offset drift of 1.3 µV/°C and CMRR ≥63 dB over full common-mode range (0 V to V+ − 2.3 V).

Key Specifications

Pinout & Package

LMC662AIM-TI is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package per NS Package Number M08A, with standard 1.27 mm pitch and gull-wing leads. Thermal resistance θ_JA = 165 °C/W on 2-layer PCB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual CMOS op-amp applications.

Compared with LMC662AIM-TI, TLC27L2CDR trades femtoampere input bias for lower cost and moderate drift, while OPA2333AIDR delivers near-zero drift at the expense of 100× higher input current - making LMC662AIM-TI uniquely suited for high-impedance, single-supply, rail-to-rail applications where leakage dominates error budget.

Availability

LMC662AIM-TI is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor signal conditioning, and battery-powered portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMC662AIM-TI 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 acquired National Semiconductor in 2011 and maintains its precision analog portfolio, including legacy high-performance op-amps designed for low-power, high-accuracy signal chains.

The LMC662AIM-TI belongs to National's CMOS operational amplifier family engineered for single-supply, rail-to-rail operation in instrumentation, medical, and industrial systems where ultra-low input bias current and wide supply range are critical.

FAQ

What is the maximum capacitive load the LMC662AIM-TI can drive without oscillation?

The LMC662AIM-TI may oscillate with capacitive loads >100 pF in unity-gain follower configuration. Stability is restored by adding a 50–100 Ω series resistor at the output and a 5–10 pF feedback capacitor from output to inverting input. With this compensation, LMC662AIM-TI reliably drives ≥1 nF loads in non-inverting configurations with gain ≥10, as verified in TI's DS009763 Figure 33.

Does the LMC662AIM-TI support true rail-to-rail input common-mode range?

The LMC662AIM-TI input common-mode range extends to V− (ground in single-supply mode) but not to V+. Per DS009763, the upper limit is V+ − 2.3 V at 25°C - meaning it accepts inputs up to 2.7 V with a 5 V supply. This allows interfacing with ground-referenced sensors but requires level-shifting for V+-referenced signals.

Can the LMC662AIM-TI operate from a 3.3 V supply?

No. The LMC662AIM-TI minimum supply voltage is 4.75 V per Absolute Maximum Ratings and Operating Ratings tables in DS009763. At 3.3 V, internal biasing fails, resulting in undefined output behavior and potential phase reversal. For 3.3 V systems, consider TI's TLV2462 or OPA2316 as alternatives.

What is the thermal resistance (θ_JA) of the LMC662AIM-TI in SOIC-8 package?

The LMC662AIM-TI in SOIC-8 (M08A) package has a junction-to-ambient thermal resistance (θ_JA) of 165 °C/W when mounted on a standard 2-layer PCB per DS009763. This value assumes no copper pour; adding 1-inch² thermal pad reduces θ_JA to ~85 °C/W, enabling 1.5 mA total supply current operation at 85°C ambient without derating.

Is the LMC662AIM-TI pin-compatible with the LM358?

Yes - the LMC662AIM-TI shares identical SOIC-8 pinout with LM358 (Pins 1–8 function-mapped), enabling drop-in replacement in existing designs. However, LMC662AIM-TI requires ≥4.75 V supply (vs. LM358's 3 V min) and delivers rail-to-rail output (vs. LM358's 1.5 V from rails), necessitating verification of headroom and supply compliance in legacy layouts.