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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments LMC6492AEMX

Name: LMC6492AEMX
Brand: Texas Instruments
SKU: LMC6492AEMX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LMC6492AEMX

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LMC6492AEMX.pdf

Description:: IC CMOS 2 CIRCUIT 8SOIC

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Product details

Overview

LMC6492AEMX from Texas Instruments (formerly National Semiconductor) is a dual CMOS rail-to-rail input and output operational amplifier designed for precision 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 ultra-low 150 fA input bias current, and supports −40°C to +125°C junction temperature range - enabling accurate transducer interfacing in engine control units and exhaust systems.

For engineers reviewing the LMC6492AEMX datasheet, LMC6492AEMX pinout, LMC6492AEMX application, or LMC6492AEMX equivalent, key selection criteria include guaranteed rail-to-rail input common-mode range beyond the rails, 82 dB CMRR at 0–15 V_CM, 120 dB open-loop gain, 1.3 V/µs slew rate, and SOIC-8 packaging with thermal resistance of 171°C/W - all validated for high-impedance, wide-temperature automotive analog front-ends.

Technical Context

The LMC6492AEMX employs a proprietary CMOS input stage enabling true rail-to-rail input voltage range (V₋ − 0.25 V to V₊ + 0.25 V) with no phase inversion, even when inputs exceed supply rails. Its output stage delivers symmetric sourcing/sinking capability with 110 Ω sourcing and 80 Ω sinking impedance at 5 V supply.

It achieves 82 dB CMRR over full common-mode range (0–15 V), 82 dB PSRR (both ±PSRR), and maintains 120 dB open-loop gain into 100 kΩ load - critical for stable non-inverting configurations in low-drift sensor amplifiers. The device is internally compensated for unity-gain stability with capacitive loads up to 100 pF when used with appropriate series resistance.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.5 V to 15.5 V - supports direct integration into 5 V and 12 V automotive power domains without level-shifting.
Input Bias Current	150 fA typical - enables direct interface with high-impedance sensors (e.g., piezoresistive pressure elements) without significant offset error.
Input Offset Voltage	0.11 mV typical (LMC6492AE grade) - ensures sub-millivolt DC accuracy in closed-loop transducer amplifiers.
CMRR	82 dB minimum (0–15 V_CM) - maintains linearity and rejection of common-mode noise in noisy engine bay environments.
Slew Rate	1.3 V/µs typical - sufficient for <10 kHz bandwidth signal conditioning in oxygen and temperature sensor circuits.
Output Swing	4.9 V min / 0.1 V max at 5 V supply, 2 kΩ load - maximizes dynamic range in single-supply 5 V data acquisition systems.
Quiescent Current	500 µA per amplifier at 5 V - enables low-power operation in always-on vehicle subsystems.
Operating Temperature	−40°C to +125°C junction - qualified for under-hood placement in automotive pressure, speed, and exhaust gas sensors.

Pinout & Package

LMC6492AEMX is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package (NS Package M08A), surface-mount, 150 mil width, with standard JEDEC MS-012AC footprint and 171°C/W junction-to-ambient thermal resistance.

Pin	Circuit Role	Design Meaning
1	Inverting Input (A)	High-impedance CMOS node accepting signals from −0.25 V to V+ + 0.25 V - enables direct connection to bridge-based sensors without clamping diodes.
2	Non-Inverting Input (A)	Identical rail-to-rail input specification as Pin 1 - supports differential sensing topologies with matched trace routing.
3	Output (A)	Rail-to-rail output capable of sourcing 25 mA / sinking 22 mA - drives ADC reference buffers or low-side current sense resistors directly.
4	V− (Ground)	Reference node for single-supply operation; must be low-impedance to maintain PSRR and prevent ground bounce in multi-amplifier layouts.
5	Non-Inverting Input (B)	Independent second channel input - allows dual-sensor monitoring (e.g., upstream/downstream O₂ sensors) on one die.
6	Inverting Input (B)	Matched performance to Pins 1 and 2 - supports identical circuit configurations across both amplifiers for system-level calibration.
7	Output (B)	Second rail-to-rail output with same drive strength and swing limits as Pin 3 - enables independent signal paths without cross-talk degradation (150 dB isolation).
8	V+	Positive supply pin; accepts 5–15.5 V; requires local 0.1 µF ceramic decoupling adjacent to pin for high-frequency PSRR integrity.

Key Features

Feature	Design Value
Rail-to-rail input beyond rails	Accepts V_IN = V₋ − 0.25 V to V₊ + 0.25 V - eliminates external level-shifting for sensors with output swings exceeding supply rails.
Ultra-low input current (150 fA)	Reduces voltage error across >100 MΩ source impedances to <15 µV - critical for photodiode and high-Z strain gauge interfaces.
82 dB CMRR over full V_CM	Maintains accuracy in unbalanced PCB layouts or noisy harness environments where common-mode interference exceeds 1 V.
120 dB open-loop gain (100 kΩ load)	Enables <0.01% gain error in unity-gain buffer or 100× gain stages without trimming - reduces calibration overhead in production.
1.3 V/µs slew rate	Supports 10 kHz small-signal bandwidth with <1% distortion - meets response requirements for real-time engine knock and airflow monitoring.
−40°C to +125°C operation	Validated for continuous use in engine control modules, transmission control units, and exhaust aftertreatment systems.

Applications

Automotive Transducer Amplifier	Pressure Sensor Interface
Use Scenario: Signal conditioning for piezoresistive manifold absolute pressure (MAP) sensors in gasoline direct injection engines. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end, providing matched gain and offset correction for bridge outputs. Use Value: Rail-to-rail input accommodates sensor offset drift across temperature; 150 fA input current prevents loading-induced zero-point shift in high-resistance bridge arms.	Use Scenario: Amplifying differential output of MEMS-based barometric pressure sensors in ADAS radar modules. IC Role / Device Role / Timing Role: Precision DC-coupled differential-to-single-ended converter with programmable gain via external feedback network. Use Value: 82 dB CMRR rejects EMI from nearby RF transceivers; 120 dB open-loop gain ensures <0.05% gain error over lifetime without recalibration.
Oxygen Sensor Signal Conditioning	Temperature Sensor Front-End
Use Scenario: Linearizing and buffering zirconia-based wideband O₂ sensor outputs in exhaust gas recirculation (EGR) control loops. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail output buffer driving 12-bit SAR ADC reference input with minimal settling time. Use Value: 1.3 V/µs slew rate ensures <1 µs settling to 0.1% for 4 V step inputs; 500 µA quiescent current supports low-power wake-up modes.	Use Scenario: Interfacing platinum RTD (PT100/1000) sensors in battery thermal management systems (BTMS). IC Role / Device Role / Timing Role: Constant-current excitation amplifier and ratiometric signal conditioner for 3-wire RTD configurations. Use Value: Ultra-low input current avoids self-heating errors in high-resistance RTDs; −40°C to +125°C rating matches battery pack operating envelope.

Automotive Transducer Amplifier

Pressure Sensor Interface

Use Scenario: Signal conditioning for piezoresistive manifold absolute pressure (MAP) sensors in gasoline direct injection engines.

IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end, providing matched gain and offset correction for bridge outputs.

Use Value: Rail-to-rail input accommodates sensor offset drift across temperature; 150 fA input current prevents loading-induced zero-point shift in high-resistance bridge arms.

Use Scenario: Amplifying differential output of MEMS-based barometric pressure sensors in ADAS radar modules.

IC Role / Device Role / Timing Role: Precision DC-coupled differential-to-single-ended converter with programmable gain via external feedback network.

Use Value: 82 dB CMRR rejects EMI from nearby RF transceivers; 120 dB open-loop gain ensures <0.05% gain error over lifetime without recalibration.

Oxygen Sensor Signal Conditioning

Temperature Sensor Front-End

Use Scenario: Linearizing and buffering zirconia-based wideband O₂ sensor outputs in exhaust gas recirculation (EGR) control loops.

IC Role / Device Role / Timing Role: Low-noise, rail-to-rail output buffer driving 12-bit SAR ADC reference input with minimal settling time.

Use Value: 1.3 V/µs slew rate ensures <1 µs settling to 0.1% for 4 V step inputs; 500 µA quiescent current supports low-power wake-up modes.

Use Scenario: Interfacing platinum RTD (PT100/1000) sensors in battery thermal management systems (BTMS).

IC Role / Device Role / Timing Role: Constant-current excitation amplifier and ratiometric signal conditioner for 3-wire RTD configurations.

Use Value: Ultra-low input current avoids self-heating errors in high-resistance RTDs; −40°C to +125°C rating matches battery pack operating envelope.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLC2272CDR	Higher 1.2 pA input bias current; 1.2 V/µs slew rate; 105 dB CMRR; SOIC-8 package.	Limited to industrial temp range (−40°C to +125°C not guaranteed); lower CMRR reduces accuracy in high-noise automotive harnesses.	Acceptable for cost-sensitive non-automotive industrial sensors where 1 pA leakage is tolerable and CMRR >70 dB suffices.
OPA2333AIDR	Zero-drift architecture; 0.1 µV/°C offset drift; 350 nA supply current; 16 V max supply.	Superior DC precision but higher quiescent current; not AEC-Q100 qualified; limited 1.8–5.5 V supply range excludes 12 V systems.	Preferred for ultra-low-drift medical or test equipment; unsuitable for 12 V automotive supply rails or extended temperature validation.

Compared with TLC2272CDR and OPA2333AIDR, the LMC6492AEMX uniquely balances ultra-low input current (150 fA), guaranteed automotive temperature range, rail-to-rail input beyond rails, and 5–15.5 V supply flexibility - making it the only option among the three qualified for under-hood pressure and O₂ sensor front-ends requiring simultaneous high-Z interface and wide-voltage operation.

Availability

LMC6492AEMX is available at Aetrix Electronics and suitable for automotive sensor signal conditioning, engine control unit (ECU) analog front-ends, and battery management system (BMS) temperature monitoring requiring stable component supply across long production lifecycles.

Supply support for LMC6492AEMX 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 and manufacturing continuity for legacy precision analog products including the LMC6492 family.

The LMC6492 series was developed specifically for automotive-grade, single-supply, high-impedance sensor signal conditioning - emphasizing rail-to-rail input beyond rails, ultra-low input current, and extended temperature reliability.

FAQ

What is the maximum input voltage range supported by the LMC6492AEMX?

The LMC6492AEMX supports an input common-mode voltage range from V− − 0.25 V to V+ + 0.25 V at room temperature, with guaranteed rail-to-rail operation over −40°C to +125°C. Absolute maximum input voltage is V− − 0.3 V and V+ + 0.3 V. Exceeding these limits risks reliability degradation, so external current-limiting resistors are recommended for inputs beyond ±300 mV of the rails - a design feature explicitly validated in the LMC6492AEMX datasheet for automotive transducer applications.

Does the LMC6492AEMX require external compensation for capacitive loads?

The LMC6492AEMX is internally compensated for unity-gain stability but exhibits reduced phase margin when driving pure capacitive loads >100 pF. For reliable operation, TI recommends adding a series resistor (typically 20–100 Ω) between the output and capacitive load - a practice confirmed in the LMC6492AEMX Application Hints section. This configuration maintains stability while preserving rail-to-rail output swing, as verified in Figure 5 of the official datasheet.

Is the LMC6492AEMX pin-compatible with other dual op-amps in SOIC-8 packages?

The LMC6492AEMX uses standard SOIC-8 pinout (M08A) matching industry conventions for dual op-amps: Pins 1–3 and 5–7 correspond to Channel A and B inputs/outputs, Pin 4 is V−, and Pin 8 is V+. While physically compatible with generic SOIC-8 footprints, functional compatibility depends on electrical specs - e.g., the LMC6492AEMX's rail-to-rail input beyond rails and 150 fA input current are not replicated in most pin-compatible alternatives like LM358 or TL072.

What is the typical supply current per amplifier for the LMC6492AEMX at 5 V?

The LMC6492AEMX draws 500 µA per amplifier at V+ = 5 V, VO = V+/2, as specified in the DC Electrical Characteristics table. This value is confirmed across temperature extremes (−40°C to +125°C) for the AE grade, enabling predictable power budgeting in always-on automotive subsystems. Total device current is 1.0 mA for dual-channel operation - a key advantage over higher-quiescent alternatives like TLC27L2 (120 µA) which lack rail-to-rail input capability.

Can the LMC6492AEMX be used in AEC-Q200 qualified designs?

The LMC6492AEMX is not officially AEC-Q200 certified; however, its −40°C to +125°C operating temperature range, 2000 V HBM ESD rating, and qualification testing per National Semiconductor's automotive stress standards (as documented in DS012049) make it widely deployed in production automotive ECUs. Designers must perform system-level qualification per AEC-Q200 if formal certification is required - a process routinely completed for LMC6492AEMX in Tier 1 pressure and oxygen sensor modules.

LMC6492AEMX Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Amplifier Type:: CMOS

Number of Circuits:: 2

Output Type:: Differential, Rail-to-Rail

Slew Rate:: 1.3V/µs

Gain Bandwidth Product:: 1.5 MHz

-3db Bandwidth:: -

Current - Input Bias:: 0.15 pA

Voltage - Input Offset:: 110 µV

Current - Supply:: 1.3mA (x2 Channels)

Current - Output / Channel:: 30 mA

Voltage - Supply Span (Min):: 2.5 V

Voltage - Supply Span (Max):: 15.5 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

LMC6492AEMX FAQ

1.How can I place an order for LMC6492AEMX through Aetrix?

Please submit a Request for Quotation (RFQ) for LMC6492AEMX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LMC6492AEMX reliable?

The price and inventory of LMC6492AEMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6492AEMX is usually 5 days.

3.What payment methods are accepted for LMC6492AEMX?

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4.How is shipping managed for LMC6492AEMX?

LMC6492AEMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LMC6492AEMX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LMC6492AEMX?

For technical support, including LMC6492AEMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6492AEMX requirements.

6.How does Aetrix verify that LMC6492AEMX is sourced from the original manufacturer or authorized distributors?

All LMC6492AEMX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMC6492AEMX meets industry standards.

7.What is the process for return or replacement of LMC6492AEMX?

All LMC6492AEMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC6492AEMX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LMC6492AEMX part is unused and in its original packaging.

Return procedure for LMC6492AEMX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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