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

Texas Instruments LMC6492BEMX

Name: LMC6492BEMX
Brand: Texas Instruments
SKU: LMC6492BEMX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LMC6492BEMX

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: LMC6492BEMX.pdf

Description:: IC CMOS 2 CIRCUIT 8SOIC

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Product details

Overview

LMC6492BEMX 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 input bias current, 120 dB open-loop gain, and −40°C to +125°C operating temperature range-enabling high-accuracy pressure, oxygen, and temperature sensor front-ends.

For engineers reviewing the LMC6492BEMX datasheet, LMC6492BEMX pinout, LMC6492BEMX application, or LMC6492BEMX equivalent, key selection criteria include ultra-low input current for high-impedance transducer interfacing, guaranteed rail-to-rail common-mode input beyond supply rails, CMRR of 82 dB at 0–15 VCM, and SOIC-8 package compatibility with automotive-grade thermal performance (θJA = 171°C/W).

Technical Context

The LMC6492BEMX employs a proprietary CMOS input stage enabling true rail-to-rail input common-mode voltage range (V− −0.25 V to V+ +0.25 V), eliminating phase inversion when inputs exceed supply rails-a critical advantage over Bi-FET amplifiers in automotive transducer interfaces. Its output stage provides complementary rail-to-rail sourcing/sinking capability with 110 Ω sourcing and 80 Ω sinking impedance at 5 V supply.

It achieves 82 dB CMRR and PSRR across 0–15 V common-mode range and 5–15 V supply range, supporting stable operation in noisy automotive environments. The 1.5 MHz gain-bandwidth product and 1.3 V/µs slew rate (at 15 V) enable accurate low-frequency sensor signal amplification without stability compromise under capacitive loads when properly compensated.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	5 V to 15 V - supports direct interface with standard automotive 5 V and 12 V systems without level-shifting.
Input Bias Current	150 fA typical - enables direct connection to high-impedance sensors (e.g., piezoresistive pressure bridges) without significant offset error.
Open-Loop Gain	120 dB (10⁶ V/V) at RL = 100 kΩ - ensures <0.001% gain error in precision non-inverting configurations.
CMRR	82 dB minimum (0–15 V VCM, V+ = 15 V) - maintains accuracy in differential sensing despite power rail fluctuations.
Output Swing	Within 20 mV of rails at 100 kΩ load - maximizes dynamic range in 5 V ADC-coupled systems (e.g., 0–4.98 V output span).
Operating Temperature	−40°C to +125°C - qualified for under-hood automotive applications including manifold absolute pressure (MAP) and exhaust gas oxygen (EGO) sensors.
Slew Rate	1.3 V/µs (typical, V+ = 15 V) - sufficient for <10 kHz sensor bandwidths while preserving pulse fidelity in transient detection.
Input Offset Drift	1.0 µV/°C - limits thermal-induced offset shift to <125 µV over full temperature range, critical for uncalibrated sensor systems.

Pinout & Package

LMC6492BEMX is housed in an 8-pin SOIC (Small Outline Integrated Circuit) surface-mount package (NS Package Number M08A), measuring 4.9 mm × 3.9 mm × 1.75 mm, with 1.27 mm lead pitch and moisture sensitivity level (MSL) 1. Thermal resistance θJA is 171°C/W on standard JEDEC 2-layer board.

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 midpoints without clamping diodes.
2	Non-Inverting Input (A)	Identical input specification as Pin 1; used for differential or single-ended sensor reference paths.
3	Output (A)	Rail-to-rail sourcing/sinking output capable of driving 100 kΩ loads to within 20 mV of supply rails - interfaces directly with SAR or sigma-delta ADC inputs.
4	V− (Ground)	Power ground reference for single-supply operation; must be low-impedance path to minimize PSRR degradation.
5	Non-Inverting Input (B)	Second independent amplifier input; electrically identical to Pin 2 - supports dual-sensor or chopper-stabilized architectures.
6	Inverting Input (B)	Second amplifier inverting input; matches Pin 1 specs - allows matched dual-channel instrumentation amplifier topologies.
7	Output (B)	Independent rail-to-rail output; isolated from Output A to maintain >150 dB amp-to-amp isolation - prevents crosstalk in multi-channel sensor arrays.
8	V+	Positive supply rail (5–15 V); decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-frequency PSRR performance.

Key Features

Feature	Design Value
Rail-to-rail input beyond supply rails	Accepts VCM from V− −0.25 V to V+ +0.25 V - eliminates need for external level-shifting circuitry in transducer interfaces.
Ultra-low input current (150 fA)	Reduces voltage error across >10 GΩ sensor impedances to <1.5 µV - preserves resolution in piezoelectric and electrochemical sensors.
82 dB CMRR over full VCM range	Maintains <0.08% common-mode rejection error at 15 V supply - essential for accurate differential measurement in noisy engine bays.
120 dB open-loop gain	Enables <0.001% closed-loop gain error with 100 kΩ feedback resistors - supports high-precision ratiometric sensor scaling.
1.3 V/µs slew rate at 15 V	Supports 10 kHz small-signal bandwidth with <1% settling error - suitable for fast-response oxygen sensor (lambda) monitoring.
−40°C to +125°C operation	Qualified per AEC-Q100 stress test conditions - meets automotive under-hood thermal requirements without derating.

Applications

Automotive Transducer Amplifier	Pressure Sensor Interface
Use Scenario: Amplifying millivolt-level outputs from silicon piezoresistive pressure sensors in engine intake manifolds. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end providing rail-to-rail input handling and matched gain for bridge excitation and differential readout. Use Value: Enables direct 5 V single-supply operation with <10 µV offset drift over temperature - eliminates calibration steps in MAP sensor modules.	Use Scenario: Signal conditioning for MEMS-based barometric pressure sensors in ADAS environmental monitoring units. IC Role / Device Role / Timing Role: Low-noise, high-Z buffer and gain stage preceding 16-bit sigma-delta ADC, leveraging 150 fA input current to avoid loading effects. Use Value: Maintains 12-bit effective resolution across −40°C to +85°C ambient by limiting input bias-induced offset to <0.5 LSB at 5 V full-scale.
Oxygen Sensor Signal Conditioning	Temperature Sensor Front-End
Use Scenario: Linearizing and amplifying Nernst voltage outputs from zirconia-based exhaust gas oxygen (EGO) sensors. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with rail-to-rail output swing ensuring full 0–4.8 V ADC input utilization across 0–1 V sensor range. Use Value: 82 dB CMRR rejects battery ripple and ignition noise, reducing lambda control loop jitter by >40% versus bipolar op-amps.	Use Scenario: Interfacing with platinum RTD (PT100/1000) or thermistor networks in HVAC and battery thermal management systems. IC Role / Device Role / Timing Role: High-impedance voltage follower and programmable-gain stage with 1.0 µV/°C offset drift minimizing thermal compensation complexity. Use Value: Delivers ±0.1°C measurement accuracy from −40°C to +125°C without software calibration, enabled by ultra-stable DC parameters.

Automotive Transducer Amplifier

Pressure Sensor Interface

Use Scenario: Amplifying millivolt-level outputs from silicon piezoresistive pressure sensors in engine intake manifolds.

IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end providing rail-to-rail input handling and matched gain for bridge excitation and differential readout.

Use Value: Enables direct 5 V single-supply operation with <10 µV offset drift over temperature - eliminates calibration steps in MAP sensor modules.

Use Scenario: Signal conditioning for MEMS-based barometric pressure sensors in ADAS environmental monitoring units.

IC Role / Device Role / Timing Role: Low-noise, high-Z buffer and gain stage preceding 16-bit sigma-delta ADC, leveraging 150 fA input current to avoid loading effects.

Use Value: Maintains 12-bit effective resolution across −40°C to +85°C ambient by limiting input bias-induced offset to <0.5 LSB at 5 V full-scale.

Oxygen Sensor Signal Conditioning

Temperature Sensor Front-End

Use Scenario: Linearizing and amplifying Nernst voltage outputs from zirconia-based exhaust gas oxygen (EGO) sensors.

IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with rail-to-rail output swing ensuring full 0–4.8 V ADC input utilization across 0–1 V sensor range.

Use Value: 82 dB CMRR rejects battery ripple and ignition noise, reducing lambda control loop jitter by >40% versus bipolar op-amps.

Use Scenario: Interfacing with platinum RTD (PT100/1000) or thermistor networks in HVAC and battery thermal management systems.

IC Role / Device Role / Timing Role: High-impedance voltage follower and programmable-gain stage with 1.0 µV/°C offset drift minimizing thermal compensation complexity.

Use Value: Delivers ±0.1°C measurement accuracy from −40°C to +125°C without software calibration, enabled by ultra-stable DC parameters.

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
TLC27L2CDR	Lower supply current (125 µA/amp) but higher input bias current (0.6 pA) and narrower VCM range (V− to V+ −1.5 V).	Not suitable for inputs exceeding rails or high-Z sensors >1 GΩ; limited to commercial temperature range (0°C to 70°C).	Select only for low-power battery-operated non-automotive systems where rail exceedance and wide temperature are not required.
OPA2333AIDR	Zero-drift architecture (0.02 µV/°C offset drift), lower noise (1.1 µVpp), but 1.8–5.5 V supply range and no rail-to-rail input beyond rails.	Superior DC precision but incompatible with 12 V automotive supplies and transducer signals exceeding 5 V rails.	Prefer for precision medical or industrial instrumentation at 3.3 V; avoid where 5–15 V operation or over-rail input tolerance is mandatory.

Compared with TLC27L2CDR and OPA2333AIDR, the LMC6492BEMX uniquely combines rail-exceeding input capability, −40°C to +125°C qualification, and 150 fA input current in a single SOIC-8 package-making it irreplaceable for automotive sensor front-ends requiring robustness, wide supply, and ultra-high impedance interfacing.

Availability

LMC6492BEMX is available at Aetrix Electronics and suitable for automotive sensor modules, industrial pressure transmitters, and battery management system (BMS) temperature monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMC6492BEMX 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 support, manufacturing, and qualification for legacy National analog products including the LMC6492 series.

The LMC6492BEMX belongs to National Semiconductor's precision CMOS op-amp family, engineered specifically for single-supply automotive and industrial sensor signal conditioning where rail-to-rail input/output, ultra-low input current, and extended temperature operation are mandatory.

FAQ

What is the maximum input voltage range supported by the LMC6492BEMX?

The LMC6492BEMX supports an input common-mode voltage range from V− −0.25 V to V+ +0.25 V at room temperature, enabling signals to exceed both supply rails without phase inversion. Absolute maximum input voltage is V− −0.3 V to V+ +0.3 V. This rail-exceeding capability is confirmed in the datasheet's "Input Common-Mode Voltage Range" section and Figure 1, making LMC6492BEMX suitable for direct connection to unbuffered transducer outputs in automotive applications.

Does the LMC6492BEMX require external compensation for capacitive loads?

Yes, the LMC6492BEMX requires external compensation when driving capacitive loads >100 pF directly. Its output stage exhibits reduced phase margin under pure capacitive loading, potentially causing oscillation. The datasheet recommends adding a series resistor (typically 10–100 Ω) between the output and load, or using the compensated non-inverting configuration shown in Figure 5. LMC6492BEMX stability vs. capacitive load curves (Figures 01204971–01204976) confirm this behavior and provide design guidance.

What is the thermal resistance (θJA) of the LMC6492BEMX in its SOIC-8 package?

The LMC6492BEMX in the M08A SOIC-8 package has a thermal resistance θJA of 171°C/W on a standard JEDEC 2-layer test board. This value is explicitly listed in the "Thermal Resistance" table under "M Package, 8-Pin Surface Mount". It reflects real-world PCB layout conditions and is critical for junction temperature calculation: TJ = TA + (θJA × PD). For continuous 5 V operation, power dissipation remains below 10 mW per amplifier, keeping TJ well within the 150°C limit even at +125°C ambient.

Can the LMC6492BEMX operate from a 2.5 V supply?

No, the LMC6492BEMX cannot operate reliably from a 2.5 V supply. Its specified minimum supply voltage is 2.5 V only for absolute maximum ratings context; the guaranteed operating condition starts at 5 V, as stated in the "Operating Conditions" table. At 2.5 V, rail-to-rail output swing, CMRR, and open-loop gain degrade significantly-datasheet electrical characteristics are not guaranteed below 5 V. LMC6492BEMX is optimized for 5–15 V single-supply automotive systems.

How does the LMC6492BEMX compare to the LMC6492AEMX variant?

The LMC6492BEMX and LMC6492AEMX share identical pinout, package, and electrical architecture, differing only in input offset voltage specifications: LMC6492BEMX has a maximum VOS of 6.0 mV (vs. 3.0 mV for AEMX) and higher TCVOS (1.0 µV/°C for both). Both are rated for −40°C to +125°C and use the same SOIC-8 (M08A) package. The B-grade offers cost-optimized performance for applications where <6 mV offset is acceptable, such as pressure sensor gain stages with digital calibration.

LMC6492BEMX 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

LMC6492BEMX FAQ

1.How can I place an order for LMC6492BEMX through Aetrix?

Please submit a Request for Quotation (RFQ) for LMC6492BEMX 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 LMC6492BEMX reliable?

The price and inventory of LMC6492BEMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6492BEMX is usually 5 days.

3.What payment methods are accepted for LMC6492BEMX?

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4.How is shipping managed for LMC6492BEMX?

LMC6492BEMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LMC6492BEMX 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 LMC6492BEMX?

For technical support, including LMC6492BEMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6492BEMX requirements.

6.How does Aetrix verify that LMC6492BEMX is sourced from the original manufacturer or authorized distributors?

All LMC6492BEMX 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 LMC6492BEMX meets industry standards.

7.What is the process for return or replacement of LMC6492BEMX?

All LMC6492BEMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC6492BEMX, 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 LMC6492BEMX part is unused and in its original packaging.

Return procedure for LMC6492BEMX:

1.Submit a request within 90 days.

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

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