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

Texas Instruments LMC6492BEM

Name: LMC6492BEM
Brand: Texas Instruments
SKU: LMC6492BEM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LMC6492BEM

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: LMC6492BEM.pdf

Description:: IC CMOS 2 CIRCUIT 8SOIC

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Product details

Overview

LMC6492BEM 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 and −40°C to +125°C operating junction temperature - enabling high-accuracy pressure, oxygen, and temperature sensor front-ends in engine control units.

For engineers reviewing the LMC6492BEM datasheet, LMC6492BEM pinout, LMC6492BEM application, or LMC6492BEM equivalent, this page provides verified technical context, package-specific pin definitions, real-world automotive use cases, and validated alternative op-amps with documented parameter-level differences for design-in assurance.

Technical Context

The LMC6492BEM employs a proprietary CMOS input stage enabling true rail-to-rail common-mode voltage range - including inputs extending 0.25 V beyond V− and V+ - eliminating phase inversion and non-linear errors when interfacing with transducer outputs exceeding supply rails. Its output stage delivers symmetrical sourcing/sinking capability with 110 Ω/80 Ω effective output impedance at 5V supply.

It achieves 82 dB CMRR and PSRR across 0–15 V common-mode range, supports stable operation with capacitive loads via external series resistance, and maintains 120 dB open-loop gain and 1.3 V/µs slew rate at 15 V supply - making it suitable for precision DC-coupled amplification and low-distortion (<0.01% THD) signal paths in harsh-temperature environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	5 V to 15 V - enables direct integration into 5 V and 12 V automotive power domains without level-shifting.
Input Bias Current	150 fA typical - allows direct connection to high-impedance sensors (e.g., piezoresistive pressure elements) without measurable offset drift.
Input Offset Voltage	6.0 mV max (−40°C to +125°C) - ensures <±10 mV total error budget in uncalibrated sensor interfaces.
Output Swing	Within 20 mV of rails at 100 kΩ - maximizes dynamic range in 5 V systems, preserving >99% of full-scale ADC utilization.
CMRR	82 dB min (0 V ≤ VCM ≤ 15 V) - rejects common-mode noise from engine harnesses and shared ground returns.
Slew Rate	1.3 V/µs typical - supports bandwidth-limited pulse response up to ~100 kHz for transient sensor events (e.g., knock detection).
Quiescent Current	500 µA per amplifier at 5 V - enables low-power always-on sensor monitoring in battery-sensitive modules.
Operating Temperature	−40°C to +125°C junction - qualified for under-hood placement without derating or thermal shielding.

Pinout & Package

LMC6492BEM is supplied in an 8-pin SOIC (Small Outline Integrated Circuit) package, designated M08A by National Semiconductor, with standard dual-op-amp pinout and surface-mount footprint compatible with IPC-7351B SOIC-8 (3.9 mm body width, 1.27 mm pitch).

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting Input (Amplifier A)	High-impedance node accepting differential or single-ended signals; accepts voltages beyond rails (−0.25 V to V+ + 0.25 V).
2	Non-Inverting Input (Amplifier A)	High-impedance node; same rail-to-rail common-mode range as Pin 1; requires guarding for sub-pA leakage control.
3	Output (Amplifier A)	Rail-to-rail capable output; 110 Ω sourcing / 80 Ω sinking impedance at 5 V; limited to ±30 mA short-circuit current.
4	V− (Ground / Negative Supply)	Reference for single-supply operation; must be connected to system ground or negative rail; input/output swing referenced to this pin.
5	Non-Inverting Input (Amplifier B)	Independent high-Z input for second channel; identical electrical specs and rail tolerance as Pins 1 and 2.
6	Inverting Input (Amplifier B)	Second differential input; shares same ultra-low bias current and extended common-mode range as Amplifier A inputs.
7	Output (Amplifier B)	Second rail-to-rail output; electrically isolated from Output A; supports independent loading up to 100 kΩ.
8	V+ (Positive Supply)	Primary power input; accepts 5–15 V; internal ESD protection rated to 2000 V HBM; thermal resistance θJA = 171°C/W.

Key Features

Feature	Design Value
Rail-to-rail input common-mode range	Extends 0.25 V beyond both supply rails - eliminates need for input clamping or level-shifting in transducer interfaces.
Rail-to-rail output swing	Delivers ≥4.95 V output at 5 V supply into 100 kΩ - preserves full-scale resolution for 12-bit+ ADCs without gain compression.
Ultra-low input bias current	150 fA typical - enables use of >10 GΩ feedback resistors without measurable DC error in pH or ion-selective electrode circuits.
High CMRR over full common-mode range	82 dB minimum from 0 V to 15 V - maintains accuracy in noisy automotive grounds where common-mode transients exceed 5 V peak.
Wide temperature operation	Specified from −40°C to +125°C - supports direct mounting on engine control modules without thermal derating or external compensation.
Low offset voltage drift	1.0 µV/°C - contributes <120 µV total drift over full temperature range, critical for uncalibrated analog front-ends.

Applications

Automotive Transducer Amplifier	Pressure Sensor Interface
Use Scenario: Signal conditioning for manifold absolute pressure (MAP) sensors in gasoline direct injection engines, operating continuously at 125°C ambient. IC Role / Device Role / Timing Role: Dual-channel instrumentation-grade amplifier providing gain, common-mode rejection, and rail-to-rail buffering before 12-bit ADC sampling at 10 kHz. Use Value: Enables direct connection to Wheatstone bridge outputs without external level-shifting, while maintaining <0.5% full-scale error across temperature due to 6.0 mV max VOS and 1.0 µV/°C drift.	Use Scenario: Front-end amplification for piezoresistive tire pressure monitoring system (TPMS) sensors in wheel wells exposed to −40°C cold soak and rapid thermal cycling. IC Role / Device Role / Timing Role: Low-power, high-Z buffer and gain stage driving SAR ADC with minimal settling time; operates from vehicle battery (9–16 V) with internal regulation. Use Value: 150 fA input bias current prevents loading of high-impedance sensor elements, ensuring stable zero-point calibration over 10-year service life without recalibration drift.
Oxygen Sensor Signal Conditioning	Temperature Sensor Amplifier
Use Scenario: Amplifying narrow-range output (0.1–0.9 V) from zirconia-based exhaust oxygen (O₂) sensors in closed-loop fuel control systems. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with rail-to-rail input accommodating sensor baseline shifts; configured as non-inverting gain-of-5 stage. Use Value: 82 dB CMRR rejects common-mode noise from ignition coils and alternator ripple, ensuring <±10 mV measurement uncertainty during wide-open-throttle conditions.	Use Scenario: Linearization and amplification of PT100/PT1000 RTD outputs in transmission fluid temperature sensing, requiring stable gain and low self-heating. IC Role / Device Role / Timing Role: Constant-current excitation driver and low-drift difference amplifier; uses matched resistor networks to minimize ratio errors. Use Value: 120 dB open-loop gain and 6.0 mV max VOS enable 0.1°C resolution over −40°C to +150°C range without trimming, reducing BOM count and calibration steps.

Automotive Transducer Amplifier

Pressure Sensor Interface

Use Scenario: Signal conditioning for manifold absolute pressure (MAP) sensors in gasoline direct injection engines, operating continuously at 125°C ambient.

IC Role / Device Role / Timing Role: Dual-channel instrumentation-grade amplifier providing gain, common-mode rejection, and rail-to-rail buffering before 12-bit ADC sampling at 10 kHz.

Use Value: Enables direct connection to Wheatstone bridge outputs without external level-shifting, while maintaining <0.5% full-scale error across temperature due to 6.0 mV max VOS and 1.0 µV/°C drift.

Use Scenario: Front-end amplification for piezoresistive tire pressure monitoring system (TPMS) sensors in wheel wells exposed to −40°C cold soak and rapid thermal cycling.

IC Role / Device Role / Timing Role: Low-power, high-Z buffer and gain stage driving SAR ADC with minimal settling time; operates from vehicle battery (9–16 V) with internal regulation.

Use Value: 150 fA input bias current prevents loading of high-impedance sensor elements, ensuring stable zero-point calibration over 10-year service life without recalibration drift.

Oxygen Sensor Signal Conditioning

Temperature Sensor Amplifier

Use Scenario: Amplifying narrow-range output (0.1–0.9 V) from zirconia-based exhaust oxygen (O₂) sensors in closed-loop fuel control systems.

IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with rail-to-rail input accommodating sensor baseline shifts; configured as non-inverting gain-of-5 stage.

Use Value: 82 dB CMRR rejects common-mode noise from ignition coils and alternator ripple, ensuring <±10 mV measurement uncertainty during wide-open-throttle conditions.

Use Scenario: Linearization and amplification of PT100/PT1000 RTD outputs in transmission fluid temperature sensing, requiring stable gain and low self-heating.

IC Role / Device Role / Timing Role: Constant-current excitation driver and low-drift difference amplifier; uses matched resistor networks to minimize ratio errors.

Use Value: 120 dB open-loop gain and 6.0 mV max VOS enable 0.1°C resolution over −40°C to +150°C range without trimming, reducing BOM count and calibration steps.

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), but only 5.5 V max supply and 0°C to +70°C rating - no automotive temp support.	Not qualified for under-hood use; limited to cabin or infotainment subsystems.	Select only for cost-sensitive, non-automotive industrial applications where temperature range and rail-to-rail input are not required.
OPA2333AIDR	Zero-drift architecture (0.02 µV/°C drift), 36 V supply, but 500 nA input bias current - 3 orders of magnitude higher than LMC6492BEM.	Better long-term stability but unsuitable for ultra-high-Z sources like electrochemical sensors.	Prefer when offset drift dominates error budget; avoid when interfacing with >1 GΩ source impedances.

Compared with TLC27L2CDR and OPA2333AIDR, the LMC6492BEM uniquely balances ultra-low input current (150 fA), extended temperature range (−40°C to +125°C), and rail-to-rail input/output in a dual configuration - making it irreplaceable for automotive transducer front-ends where both high-impedance compatibility and thermal robustness are mandatory.

Availability

LMC6492BEM is available at Aetrix Electronics and suitable for automotive sensor signal conditioning, industrial pressure monitoring, and high-precision temperature measurement requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LMC6492BEM 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.

The LMC6492BEM belongs to the LMC649x family of rail-to-rail CMOS op-amps engineered specifically for single-supply automotive sensor interfaces demanding wide temperature operation, ultra-low input current, and guaranteed rail-to-rail performance.

FAQ

What is the maximum operating supply voltage for the LMC6492BEM?

The LMC6492BEM has an absolute maximum supply voltage (V+ − V−) of 16 V, with recommended operating range from 5 V to 15 V. Operation at 15.5 V is permitted per datasheet Operating Conditions, but sustained use above 15 V may reduce long-term reliability. The LMC6492BEM is not rated for split-supply configurations exceeding ±8 V, and its rail-to-rail input/output behavior is fully specified only within the 5–15 V single-supply window.

Does the LMC6492BEM support input voltages beyond the supply rails?

Yes, the LMC6492BEM supports input common-mode voltages from (V− − 0.25 V) to (V+ + 0.25 V) - confirmed in DC Electrical Characteristics and Application Hints. This rail-overdrive capability eliminates phase inversion and nonlinear clipping when interfacing with transducers whose outputs swing beyond supply limits, such as piezoelectric knock sensors or certain oxygen sensor variants. Absolute maximum input voltage remains ±0.3 V beyond rails per Absolute Maximum Ratings.

What is the guaranteed input offset voltage specification for LMC6492BEM over temperature?

The LMC6492BEM guarantees a maximum input offset voltage of 6.0 mV across the full operating junction temperature range of −40°C to +125°C, as specified in the DC Electrical Characteristics table. This is distinct from the LMC6492AE variant (3.0 mV max). The 6.0 mV limit includes all drift contributions, and the typical value at 25°C is 0.11 mV - meaning most units exhibit significantly lower offset, but designs must budget for the worst-case 6.0 mV in safety-critical automotive applications.

Can the LMC6492BEM drive capacitive loads directly?

The LMC6492BEM is not optimized for direct capacitive load driving; its phase margin degrades with pure capacitive loads due to output-stage pole interaction. As documented in Application Hints, stable operation requires either a series isolation resistor (typically 10–100 Ω) between output and capacitance, or parallel resistive loading (e.g., 10 kΩ to ground) when driving >100 pF. The LMC6492BEM datasheet provides stability vs. capacitive load curves confirming optimal performance with ≥1 kΩ resistive load in parallel with capacitance.

What package type is used for the LMC6492BEM ordering option?

The LMC6492BEM is supplied exclusively in an 8-pin SOIC surface-mount package, identified by National Semiconductor drawing number M08A. This package measures 4.9 mm × 3.9 mm × 1.75 mm with 1.27 mm lead pitch and gull-wing leads. It is distinct from the through-hole N08A DIP variant (LMC6492BEN) and carries a thermal resistance θJA of 171°C/W on standard 2-layer JEDEC test board - critical for thermal design in sealed automotive enclosures.

LMC6492BEM Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

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

Packaging:: Tube

Product Status:: Not For New Designs

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

LMC6492BEM FAQ

1.How can I place an order for LMC6492BEM through Aetrix?

Please submit a Request for Quotation (RFQ) for LMC6492BEM 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 LMC6492BEM reliable?

The price and inventory of LMC6492BEM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6492BEM is usually 5 days.

3.What payment methods are accepted for LMC6492BEM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6492BEM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LMC6492BEM?

LMC6492BEM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LMC6492BEM 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 LMC6492BEM?

For technical support, including LMC6492BEM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6492BEM requirements.

6.How does Aetrix verify that LMC6492BEM is sourced from the original manufacturer or authorized distributors?

All LMC6492BEM 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 LMC6492BEM meets industry standards.

7.What is the process for return or replacement of LMC6492BEM?

All LMC6492BEM units undergo pre-shipment inspection (PSI). If there is an issue with LMC6492BEM, 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 LMC6492BEM part is unused and in its original packaging.

Return procedure for LMC6492BEM:

1.Submit a request within 90 days.

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

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