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Texas Instruments LMC6492AEM
- Part No.:
- LMC6492AEM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6492AEM.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,820
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Product details
Overview
LMC6492AEM 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 temperature range, and is used in pressure, oxygen, and temperature sensor front-ends.
For engineers reviewing the LMC6492AEM datasheet, LMC6492AEM pinout, LMC6492AEM application, or LMC6492AEM equivalent, this page provides verified technical context, pin-level design meaning, real-world application cards, and two validated alternative parts with documented functional and application differences.
Technical Context
The LMC6492AEM 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 nonlinear errors when transducer signals exceed supply limits. Its output stage delivers rail-to-rail swing with sourcing/sinking capability up to ±30 mA and low output impedance (110 Ω sourcing / 80 Ω sinking at 5 V).
It achieves 82 dB CMRR and PSRR across 0 V to 15 V common-mode range, supports stable operation with capacitive loads via external resistive isolation, and maintains 120 dB open-loop gain and 1.3 V/µs slew rate at 15 V supply - all while consuming only 500 µA per amplifier at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 15 V - enables direct interface with 5 V microcontrollers and 12 V automotive systems without level-shifting. |
| Input Bias Current | 150 fA typical - allows direct connection to high-impedance sensors (e.g., piezoresistive strain gauges, pH electrodes) without significant offset error. |
| Input Common-Mode Range | V− − 0.3 V to V+ + 0.3 V - supports input signals exceeding supply rails, critical for unbuffered transducer outputs in single-supply designs. |
| Output Swing | Within 20 mV of rails at 100 kΩ - maximizes dynamic range in 5 V ADC interfaces, preserving >99% of full-scale resolution. |
| CMRR | 82 dB minimum (0 V ≤ VCM ≤ 15 V) - ensures accurate differential measurement in noisy automotive environments with large common-mode interference. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive applications including manifold absolute pressure (MAP) and exhaust gas oxygen (EGO) sensing. |
| Gain-Bandwidth Product | 1.5 MHz at 15 V - sufficient for anti-aliasing filtering and closed-loop bandwidths up to ~150 kHz in unity-gain stable configurations. |
Pinout & Package
LMC6492AEM is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package per NS Package Number M08A, with standard dual op-amp pinout compatible with industry layout practices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amplifier A) | High-impedance node accepting differential or inverting feedback signals; requires guarding for <1 pA leakage integrity. |
| 2 | Non-Inverting Input (Amplifier A) | Accepts reference or sensor signal; supports rail-to-rail common-mode range - usable down to V− − 0.3 V. |
| 3 | Output (Amplifier A) | Rail-to-rail output capable of sourcing/sinking ±30 mA; output impedance ~110 Ω (sourcing) / 80 Ω (sinking) at 5 V. |
| 4 | V− (Ground/Return) | Single-supply reference node; must be low-impedance and decoupled to minimize PSRR degradation. |
| 5 | Non-Inverting Input (Amplifier B) | Independent second channel input; identical rail-to-rail common-mode behavior as Pin 2. |
| 6 | Inverting Input (Amplifier B) | Second channel inverting node; shares same ultra-low bias current and ESD protection characteristics as Pin 1. |
| 7 | Output (Amplifier B) | Second independent rail-to-rail output; amp-to-amp isolation >150 dB prevents crosstalk in dual-sensor systems. |
| 8 | V+ | Positive supply rail; accepts 5 V to 15 V; internal ESD protection rated to ±2000 V HBM. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.3 V beyond both supply rails - eliminates need for input clamping or level-shifting in single-supply transducer interfaces. |
| Ultra-low input bias current (150 fA) | Enables use of multi-MΩ feedback networks without measurable DC error - critical for precision pH and ion-selective electrode amplifiers. |
| 82 dB CMRR over full common-mode range | Maintains accuracy in high-noise engine bay environments where common-mode transients exceed 10 V peak-to-peak. |
| 120 dB open-loop gain (RL = 100 kΩ) | Ensures <10 µV output error in unity-gain buffer configurations - suitable for 16-bit ADC driver applications. |
| −40°C to +125°C guaranteed operation | Validated for automotive under-hood placement without derating - supports MAP, oil pressure, and coolant temperature sensor modules. |
Applications
| Automotive Pressure Sensor | Oxygen Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying millivolt-level differential output from a silicon piezoresistive manifold absolute pressure (MAP) sensor in engine control units. IC Role / Device Role / Timing Role: Dual-channel instrumentation-grade signal conditioner providing gain, common-mode rejection, and rail-to-rail buffering before 12-bit ADC sampling. Use Value: 82 dB CMRR rejects ignition noise; rail-to-rail input accommodates sensor offset drift beyond ground; 150 fA bias current prevents gauge resistance loading. |
Use Scenario: Conditioning Nernst voltage (0.1–1.0 V) from zirconia-based exhaust gas oxygen (EGO) sensors in closed-loop fuel control. IC Role / Device Role / Timing Role: High-input-impedance non-inverting amplifier with precise DC gain and low thermal drift for analog front-end of lambda controller. Use Value: 1.0 µV/°C offset drift minimizes calibration drift over temperature; 500 µA supply current enables low-power wake-up modes in OBD-II systems. |
| Temperature Sensor Interface | Speed Sensor Signal Amplification |
|
Use Scenario: Amplifying low-level output from platinum RTD (PT100/1000) or thermistor bridges in HVAC and battery thermal management systems. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with matched input terminals for 3-wire/4-wire RTD excitation and linearization. Use Value: Rail-to-rail output drives ADC reference range fully; 0.11 mV max input offset ensures <0.1°C measurement uncertainty at 25°C. |
Use Scenario: Amplifying and shaping low-amplitude AC signals from variable reluctance crankshaft/camshaft position sensors. IC Role / Device Role / Timing Role: Wide-bandwidth (1.5 MHz GBW), low-noise amplifier converting microvolt-level inductive pickup into clean digital-ready square waves. Use Value: 1.3 V/µs slew rate preserves edge integrity for timing-critical ignition events; 37 nV/√Hz input voltage noise maintains SNR >60 dB at 10 kHz. |
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 input bias current (1 pA vs. 150 fA); lower CMRR (70 dB); wider supply range (2.2 V to 16 V). | Less suitable for ultra-high-impedance pH or photodiode sensors; acceptable for general-purpose automotive signal conditioning. | Select TLC2272CDR only if 150 fA bias current is not required and cost is prioritized over precision. |
| OPA2333AIDR | Zero-drift architecture; 0.02 µV/°C offset drift (vs. 1.0 µV/°C); lower supply current (17 µA vs. 500 µA); narrower temp range (−40°C to +125°C same). | Better for DC-critical applications like weigh scales; less ideal for high-speed pulse response due to auto-zero frequency artifacts. | Choose OPA2333AIDR when sub-µV offset stability dominates over slew rate and power; avoid in speed sensor pulse amplification. |
Compared with TLC2272CDR and OPA2333AIDR, the LMC6492AEM uniquely balances ultra-low input current, wide rail-to-rail input range, and robust 1.3 V/µs slew rate - making it optimal for automotive transducer interfaces where sensor impedance, signal headroom, and transient fidelity are simultaneously critical.
Availability
LMC6492AEM is available at Aetrix Electronics and suitable for automotive sensor modules, industrial pressure transmitters, and battery management system front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMC6492AEM 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 LMC6492AEM belongs to TI's legacy high-precision CMOS op-amp family, originally engineered for automotive and industrial single-supply sensor signal conditioning where rail-to-rail operation, ultra-low input current, and extended temperature reliability are mandatory.
FAQ
What is the maximum operating supply voltage for the LMC6492AEM?
The LMC6492AEM has an absolute maximum supply voltage (V+ − V−) of 16 V, with recommended operating range from 5 V to 15 V. Operation at 15 V is fully characterized in the datasheet, delivering 14.7 V output swing into 2 kΩ and maintaining 1.5 MHz gain-bandwidth product - making it suitable for 12 V automotive systems with headroom for transients.
Does the LMC6492AEM support true rail-to-rail input beyond the supply rails?
Yes, the LMC6492AEM supports input voltages from V− − 0.3 V to V+ + 0.3 V at room temperature - confirmed by Figure 1 in the datasheet showing no phase inversion when inputs exceed both rails. This feature eliminates external clamping diodes in pressure and oxygen sensor circuits where transducer offsets can drift outside supply boundaries.
What is the guaranteed input offset voltage specification for the LMC6492AEM?
The LMC6492AEM has a maximum input offset voltage of 3.0 mV over temperature (−40°C to +125°C), with typical value of 0.11 mV at 25°C. This is specified in the DC Electrical Characteristics table under "LMC6492AE" grade, distinguishing it from the LMC6492BE (6.0 mV max), and directly impacts DC accuracy in RTD and thermistor measurement circuits.
Can the LMC6492AEM drive capacitive loads directly?
No - direct capacitive loading reduces phase margin and risks oscillation. The LMC6492AEM requires isolation via a series resistor (typically 10–100 Ω) between output and capacitive load, as shown in Figure 5 of the datasheet. This maintains stability while preserving pulse fidelity in anti-aliasing filter and peak detector applications.
Is the LMC6492AEM pin-compatible with other dual op-amps in SOIC-8 packages?
The LMC6492AEM uses standard dual op-amp pinout (Pin 1: A−, Pin 2: A+, Pin 3: AOUT, Pin 4: V−, Pin 5: B+, Pin 6: B−, Pin 7: BOUT, Pin 8: V+), matching industry convention. However, pin compatibility does not imply functional equivalence - alternatives like TLC2272CDR differ in bias current, CMRR, and slew rate, requiring circuit validation before substitution.
LMC6492AEM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LMC6492AEM FAQ
1.How can I place an order for LMC6492AEM through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6492AEM 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 LMC6492AEM reliable?
The price and inventory of LMC6492AEM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6492AEM is usually 5 days.
3.What payment methods are accepted for LMC6492AEM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6492AEM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6492AEM?
LMC6492AEM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6492AEM 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 LMC6492AEM?
For technical support, including LMC6492AEM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6492AEM requirements.
6.How does Aetrix verify that LMC6492AEM is sourced from the original manufacturer or authorized distributors?
All LMC6492AEM 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 LMC6492AEM meets industry standards.
7.What is the process for return or replacement of LMC6492AEM?
All LMC6492AEM units undergo pre-shipment inspection (PSI). If there is an issue with LMC6492AEM, 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 LMC6492AEM part is unused and in its original packaging.
Return procedure for LMC6492AEM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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