Texas Instruments LMC662CMX

Overview

LMC662CMX from Texas Instruments is a dual CMOS rail-to-rail output operational amplifier optimized for single-supply precision signal conditioning. It delivers 126dB open-loop voltage gain, ultra-low 2fA input bias current, and 1.1V/μs slew rate across 4.75V–15.5V supply range-enabling high-impedance buffering and low-leakage sample-and-hold in medical instrumentation and industrial sensor front-ends.

For engineers reviewing the LMC662CMX datasheet, LMC662CMX pinout, LMC662CMX application, or LMC662CMX equivalent, this page provides verified specifications, SOIC-8 package mapping, real-world design context for high-Z analog stages, and validated alternative options for precision op amp selection.

Technical Context

The LMC662CMX employs a proprietary CMOS front-end with differential input stage extending common-mode range to V− (ground) and rail-to-rail output swing into 600Ω loads. Its topology includes an additional gain stage for improved sinking capability-delivering ≥100V/mV open-loop gain at 15V supply with 600Ω load, unlike conventional CMOS amplifiers.

It operates across –40°C to +85°C (LMC662AI grade), supports single-supply operation down to 4.75V, and maintains <±3mV input offset voltage and <±1.3μV/°C drift-making it suitable for long-term integrators and precision current-to-voltage converters where thermal stability and leakage are critical.

Key Specifications

Pinout & Package

LMC662CMX is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-012AC footprint and 1.27mm pitch. Thermal resistance is 165°C/W (junction-to-ambient), requiring minimal heatsinking in ambient temperatures ≤70°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision operational amplifier applications.

Compared with LMC6062IMX and OPA2182IDR, the LMC662CMX uniquely balances ultra-low input bias current, rail-to-rail output, single-supply operation, and SOIC-8 compatibility-making it the only option among the three that satisfies all four requirements simultaneously in field-deployable instrumentation.

Availability

LMC662CMX is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor signal conditioning, and portable test equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for LMC662CMX 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 innovation in precision analog ICs and broad industrial portfolio coverage.

The LMC662CMX belongs to TI's LMC66x family of CMOS op amps engineered specifically for single-supply, high-impedance precision applications-including medical diagnostics, environmental sensing, and analytical instrumentation where leakage and offset stability are paramount.

FAQ

What is the maximum capacitive load the LMC662CMX can drive without oscillation?

The LMC662CMX becomes unstable with >100pF capacitive loads in unity-gain configuration. Stability is restored using a 50Ω series resistor at the output and a 5pF feedback capacitor from output to inverting input. This configuration allows reliable operation with up to 1nF load capacitance, as verified in TI's SNOSC51D Figure 6-3 and Section 6.1.3.

Does the LMC662CMX support true rail-to-rail input common-mode range?

No-the LMC662CMX features rail-to-rail *output* swing and input common-mode range extending *to V−* (ground), but not to V+. Its input common-mode range reaches up to (V+) − 1.9V at 25°C, as specified in Table 5.6. This makes it ideal for single-supply systems where inputs reference ground, but not for applications requiring input signals near the positive rail.

Is the LMC662CMX pin-compatible with the LM358?

Yes-the LMC662CMX shares identical SOIC-8 pinout with the LM358, enabling drop-in replacement in existing designs. However, its supply voltage range (4.75V–15.5V) is narrower than the LM358's (3V–32V), and it requires careful PCB layout (guard rings, low-leakage materials) to realize its 2fA input bias current advantage.

What is the guaranteed input offset voltage specification for LMC662CMX over temperature?

The LMC662CMX (AI grade) guarantees ±3.3mV maximum input offset voltage over the full –40°C to +85°C operating range, with typical drift of ±1.3μV/°C. This is explicitly stated in Table 5.6 under "OFFSET VOLTAGE" for LMC66xAI at TA = –40°C to +85°C, ensuring predictable DC accuracy in automotive and industrial environments.

Can the LMC662CMX be used in dual-supply configurations?

Yes-the LMC662CMX supports dual-supply operation from ±2.375V to ±7.75V, as defined in Section 5.3 "Recommended Operating Conditions." Its input common-mode range includes V−, and rail-to-rail output swing functions symmetrically around mid-supply, making it suitable for bipolar signal conditioning in audio and test equipment where split supplies are preferred.