Texas Instruments LMC6484AIM/NOPB

Overview

LMC6484AIM/NOPB from Texas Instruments is a quad 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, rail-to-rail output swing within 20 mV of supply rails (at 100 kΩ load), and operates across 3 V to 15 V supplies. It is used in high-accuracy data acquisition front-ends where full-supply-range input handling and minimal offset drift are critical.

For engineers reviewing the LMC6484AIM/NOPB datasheet, LMC6484AIM/NOPB pinout, LMC6484AIM/NOPB application, or LMC6484AIM/NOPB equivalent, key selection criteria include ultra-low input current for high-impedance sensor interfacing, guaranteed rail-to-rail performance over temperature, specified operation at 3 V/5 V/15 V, and compatibility with 600 Ω loads - all validated for industrial and medical instrumentation use cases.

Technical Context

The LMC6484AIM/NOPB employs a complementary CMOS input stage enabling true rail-to-rail input common-mode range extending 300 mV beyond both supply rails, without phase inversion. Its output stage sustains rail-to-rail swing down to 600 Ω loads while maintaining 82 dB CMRR and 82 dB PSRR across temperature.

This architecture supports precision DC-coupled amplification in single-supply DAQ systems, pH/gas sensors, and patient monitors - where preserving small-signal integrity across wide input voltage excursions and minimizing power-supply-induced error are essential design requirements.

Key Specifications

Pinout & Package

LMC6484AIM/NOPB is housed in a 14-pin PDIP (N package) with through-hole mounting and 0.300-inch body width. Pin spacing follows JEDEC MS-001 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMC6484IM/NOPB, LMC6484AIM/NOPB adds extended temperature qualification critical for automotive and industrial edge nodes; versus TLV2474CDR, it delivers 300× lower input current and 7 dB higher CMRR - directly enabling 12-bit DAQ linearity and high-impedance electrochemical sensing.

Availability

LMC6484AIM/NOPB is available at Aetrix Electronics and suitable for data acquisition systems, medical instrumentation, industrial process analytics, and currency validation equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMC6484AIM/NOPB 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 decades of heritage in precision op amp design and manufacturing excellence.

The LMC648x family was engineered specifically for high-accuracy, low-power signal conditioning in single-supply industrial, medical, and test equipment - emphasizing rail-to-rail operation, ultra-low input current, and robust CMRR across voltage and temperature.

FAQ

What is the maximum operating junction temperature for LMC6484AIM/NOPB?

The LMC6484AIM/NOPB has a maximum junction temperature (T_J) of 150°C, as specified in its Absolute Maximum Ratings table. This allows reliable operation in high-ambient environments when combined with appropriate PCB thermal design - for example, using the 53.6°C/W R_θJA of its N-package PDIP variant at moderate power dissipation. The device is rated for continuous operation up to +125°C ambient when properly heatsinked.

Does LMC6484AIM/NOPB support true rail-to-rail input at 3 V supply?

Yes, LMC6484AIM/NOPB supports true rail-to-rail input at 3 V supply: its input common-mode voltage range extends from (V−) − 0.25 V to (V+) + 0.25 V, meaning it accepts signals from –0.25 V to +3.25 V with full functionality. This is explicitly verified in Section 5.7 of the datasheet and enables direct interfacing with unbuffered sensors whose outputs exceed the supply rails by small margins.

Can LMC6484AIM/NOPB drive a 600 Ω load while maintaining rail-to-rail output swing?

Yes, LMC6484AIM/NOPB is fully specified to drive 600 Ω loads with rail-to-rail output swing: at 3 V supply, it delivers 0.37 V low and 2.5 V high swing; at 5 V, 0.3 V low and 4.5 V high; and at 15 V, 0.5 V low and 13.4 V high - all confirmed in Tables 5.6 and 5.7. This capability is critical for driving legacy analog lines and low-impedance ADC references without external buffers.

Is LMC6484AIM/NOPB pin-compatible with TLC277?

No, LMC6484AIM/NOPB is not pin-compatible with TLC277. While both are quad op amps in 14-pin packages, TLC277 uses a different pinout (e.g., V− on pin 4, V+ on pin 13), whereas LMC6484AIM/NOPB places V+ on pin 4 and V− on pin 11. However, LMC6484AIM/NOPB is a functional upgrade - TI positions it as an "improved replacement" with enhanced specs, requiring PCB redesign but delivering superior performance in rail-to-rail and low-current applications.

What is the typical input-referred voltage noise of LMC6484AIM/NOPB at 1 kHz?

The typical input-referred voltage noise of LMC6484AIM/NOPB at 1 kHz is 37 nV/√Hz, as measured with V_CM = 1 V and reported in Section 5.6 AC Specifications. This noise level supports high-resolution measurements in low-frequency sensor applications such as pH monitoring and precision weight scales, where 1/f noise dominates below 10 Hz and broadband noise impacts mid-band SNR.