Texas Instruments LMC6492BEM/NOPB

Overview

LMC6492BEM/NOPB from Texas Instruments (formerly National Semiconductor) is a dual CMOS rail-to-rail input and output operational amplifier designed for single-supply automotive sensor signal conditioning. It operates from 5V to 15V, delivers rail-to-rail output swing within 20 mV of supply rails at 100 kΩ load, features 150 fA typical input bias current, 120 dB open-loop gain, and −40°C to +125°C operating junction temperature range - enabling high-accuracy transducer interfacing in engine control units and exhaust systems.

For engineers reviewing the LMC6492BEM/NOPB datasheet, LMC6492BEM/NOPB pinout, LMC6492BEM/NOPB application, or LMC6492BEM/NOPB equivalent, this page provides verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative op-amps with documented parameter-level differences for precision analog design.

Technical Context

The LMC6492BEM/NOPB employs a proprietary CMOS input stage enabling true rail-to-rail common-mode input voltage range - extending 0.3 V beyond both supply rails - eliminating phase inversion and non-linear errors when sensing signals near ground or V_CC. Its output stage delivers symmetrical sourcing/sinking capability with 110 Ω/80 Ω effective output impedance at 5 V supply.

It achieves 82 dB CMRR and PSRR across 0 V to 15 V common-mode input range, supports stable operation with capacitive loads via external series resistance, and maintains 1.3 V/µs slew rate and 1.5 MHz gain-bandwidth product at 15 V supply - optimized for low-distortion (<0.01% THD) amplification of slow-varying sensor outputs.

Key Specifications

Pinout & Package

LMC6492BEM/NOPB is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package per NS Package Number M08A, with 1.27 mm pitch, 4.9 mm × 3.9 mm body, and exposed pad not present. Thermal resistance θ_JA = 171°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC2272CDR and OPA2333AIDR, LMC6492BEM/NOPB uniquely combines guaranteed rail-to-rail input beyond rails, 150 fA bias current, and automotive-grade temperature range - making it irreplaceable for high-accuracy, high-reliability transducer amplification where signal integrity at temperature extremes is non-negotiable.

Availability

LMC6492BEM/NOPB is available at Aetrix Electronics and suitable for automotive ECU development, exhaust aftertreatment system integration, and industrial pressure transducer module production requiring stable component supply across extended temperature ranges and long lifecycle commitments.

Supply support for LMC6492BEM/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 acquired National Semiconductor in 2011 and maintains full technical documentation, manufacturing, and support for legacy high-performance analog products including the LMC649x family.

The LMC6492BEM/NOPB belongs to TI's precision rail-to-rail op-amp product line, engineered specifically for single-supply automotive sensor signal conditioning where ultra-low input current, wide temperature operation, and rail-to-rail input/output performance are mandatory.

FAQ

What is the maximum guaranteed input common-mode voltage range for LMC6492BEM/NOPB?

The LMC6492BEM/NOPB guarantees rail-to-rail input common-mode voltage range from V− − 0.25 V to V+ + 0.25 V at temperature extremes, with absolute maximum rating of V− − 0.3 V to V+ + 0.3 V. This allows direct interfacing with sensors whose outputs swing beyond supply rails - a key differentiator versus standard CMOS op-amps. The LMC6492BEM/NOPB datasheet confirms this behavior is maintained across −40°C to +125°C.

Does LMC6492BEM/NOPB support true rail-to-rail output swing under all load conditions?

LMC6492BEM/NOPB delivers rail-to-rail output swing within 20 mV of supply rails into 100 kΩ load, as specified in the datasheet. With heavier loads (e.g., 600 Ω), swing degrades to ±0.65 V from rails at 5 V supply. The LMC6492BEM/NOPB output stage uses complementary MOSFETs with 110 Ω sourcing / 80 Ω sinking impedance - meaning actual swing must be calculated per load using Ohm's law, not assumed fixed.

Can LMC6492BEM/NOPB be used in single-supply 3.3 V systems?

No - LMC6492BEM/NOPB has minimum supply voltage of 5 V per its Absolute Maximum Ratings and Operating Conditions tables. Attempting 3.3 V operation violates guaranteed specifications and risks degraded CMRR, reduced output swing, and increased input bias current. For 3.3 V rail-to-rail op-amps, consider TI's TLV2462 or OPA333 families instead of LMC6492BEM/NOPB.

What is the thermal resistance (θ_JA) of LMC6492BEM/NOPB in its SOIC package?

The LMC6492BEM/NOPB in 8-pin SOIC (M08A) package has a thermal resistance θ_JA of 171°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board layout; adding copper pour or thermal vias can reduce effective θ_JA by up to 30%. The LMC6492BEM/NOPB junction temperature must remain ≤150°C under worst-case power dissipation.

How does LMC6492BEM/NOPB handle input overvoltage conditions beyond its supply rails?

LMC6492BEM/NOPB tolerates input voltages up to ±300 mV beyond either supply rail without phase inversion - a core feature enabled by its unique CMOS input topology. However, absolute maximum rating is ±5 mA input current; external 10 kΩ series resistors are required if inputs may exceed ±0.3 V beyond rails to prevent reliability degradation. This behavior is explicitly validated in Figure 1 and Application Hints of the LMC6492BEM/NOPB datasheet.