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Texas Instruments LMC6494AEM/NOPB
- Part No.:
- LMC6494AEM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6494AEM/NOPB.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,940
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Product details
Overview
LMC6494AEM/NOPB from Texas Instruments (formerly National Semiconductor) is a quad CMOS rail-to-rail input and output operational amplifier designed for precision single-supply sensor signal conditioning in automotive and industrial systems. 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 maintains 82 dB CMRR across −40°C to +125°C - enabling accurate transducer interfacing in manifold pressure or oxygen sensor circuits.
For engineers reviewing the LMC6494AEM/NOPB datasheet, LMC6494AEM/NOPB pinout, LMC6494AEM/NOPB application, or LMC6494AEM/NOPB equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The LMC6494AEM/NOPB 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 - critical for unconditioned sensor outputs. 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 5V).
It achieves 120 dB open-loop gain and 1.5 MHz gain-bandwidth product at 15V supply, with 37 nV/√Hz input voltage noise and 0.06 pA/√Hz input current noise at 1 kHz. Amplifier-to-amplifier isolation exceeds 150 dB, supporting independent channel operation in multi-sensor systems without crosstalk degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5V to 15V - supports direct interface with 5V microcontrollers and 12V automotive systems without level-shifting. |
| Input Bias Current | 150 fA typical - enables direct connection to high-impedance sources (e.g., piezoresistive sensors, pH electrodes) without significant offset error. |
| CMRR | 82 dB minimum (0–15V common-mode range) - ensures stable gain in non-inverting configurations despite supply ripple or ground bounce. |
| Output Swing | Within 20 mV of rails at 100 kΩ load - maximizes dynamic range in 5V ADC front-ends, preserving >99% of full-scale resolution. |
| Gain-Bandwidth Product | 1.5 MHz at 15V - sufficient for anti-aliasing filtering up to ~100 kHz and closed-loop gain ≥10 with phase margin ≥50°. |
| Input Offset Drift | 1.0 µV/°C - limits temperature-induced error to <125 µV over −40°C to +125°C, critical for calibrated pressure sensing. |
| Slew Rate | 1.3 V/µs typical - supports 10 kHz sine wave amplification at 10 VPP without distortion in unity-gain buffer applications. |
Pinout & Package
LMC6494AEM/NOPB is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package (NS Package Number M14A), 8.65 mm × 3.91 mm body size, 1.27 mm lead pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amplifier A) | Accepts differential or inverted signal path; supports input voltages beyond rails (−0.25 V to V+ +0.25 V) without phase reversal. |
| 2 | Non-Inverting Input (Amplifier A) | Reference node for single-ended or instrumentation configurations; same rail-to-rail common-mode range as Pin 1. |
| 3 | Output (Amplifier A) | Delivers rail-to-rail swing (within 20 mV of V+ or V−); capable of sourcing/sinking ≥22 mA at 5V supply. |
| 4 | Positive Supply (V+) | Primary power rail; accepts 5V–15V; PSRR ≥82 dB minimizes noise coupling from noisy 12V automotive supplies. |
| 5 | Non-Inverting Input (Amplifier B) | Independent input for second channel; identical electrical specs to Pin 2 - enables dual-sensor parallel processing. |
| 6 | Inverting Input (Amplifier B) | Matches Pin 1 functionality; allows matched gain-setting networks across channels for consistent sensor response. |
| 7 | Output (Amplifier B) | Electrically isolated from other outputs; 150 dB inter-channel isolation prevents signal leakage in multi-channel data acquisition. |
| 8 | Ground (V−) | Return path for all four amplifiers; low-impedance connection required to maintain PSRR and minimize ground bounce errors. |
| 9 | Output (Amplifier C) | Third independent output; same drive strength and swing as Pins 3 and 7 - supports triple-redundant sensor monitoring. |
| 10 | Inverting Input (Amplifier C) | Matches Pin 6; enables consistent feedback network design across all three active channels. |
| 11 | Non-Inverting Input (Amplifier C) | Matches Pin 2; allows identical biasing for all three channels in multi-sensor arrays. |
| 12 | Output (Amplifier D) | Fourth output; fully specified for simultaneous operation - no derating required when all four amplifiers are active. |
| 13 | Inverting Input (Amplifier D) | Final inverting input; supports independent gain configuration per channel without shared node constraints. |
| 14 | Non-Inverting Input (Amplifier D) | Final non-inverting input; completes quad-channel flexibility for mixed-mode signal conditioning (e.g., 2x differential + 2x single-ended). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.25 V beyond both supply rails - eliminates external level-shifting for sensors with output swings exceeding 0–5V. |
| Rail-to-rail output swing | Reaches within 20 mV of V+ and V− at 100 kΩ - preserves full-scale ADC utilization in 5V systems without headroom loss. |
| Ultra-low input bias current (150 fA) | Reduces voltage error to <1.5 µV when interfacing with 10 GΩ sensor sources - essential for stable oxygen sensor calibration. |
| High CMRR (82 dB) | Maintains gain accuracy despite common-mode noise on vehicle chassis grounds - critical for engine bay transducer signals. |
| Wide operating temperature (−40°C to +125°C) | Qualified for under-hood automotive use without derating - supports direct mounting on ECU PCBs near heat sources. |
| 150 dB amplifier-to-amplifier isolation | Prevents crosstalk between channels in quad-sensor systems (e.g., 4-cylinder engine knock detection), ensuring independent signal integrity. |
Applications
| Automotive Pressure Sensing | Oxygen Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying millivolt-level bridge output from manifold absolute pressure (MAP) sensors in engine control units. IC Role / Device Role / Timing Role: Quad op-amp configured as four independent instrumentation amplifiers, each conditioning one cylinder's pressure signal. Use Value: Rail-to-rail input accommodates sensor offsets beyond 0V; 150 fA bias current prevents drift in high-resistance bridge arms; 125°C rating ensures reliability in under-hood environments. |
Use Scenario: Buffering and amplifying Nernst cell output from wideband oxygen sensors in exhaust aftertreatment systems. IC Role / Device Role / Timing Role: Non-inverting amplifier with precise gain setting, directly interfacing electrochemical cell with 100+ MΩ source impedance. Use Value: 150 fA input bias current avoids loading the cell; rail-to-rail output drives 5V ADC reference range fully; 82 dB CMRR rejects exhaust system EMI. |
| Temperature Sensor Interface | Speed Sensor Signal Amplification |
|
Use Scenario: Linearizing and scaling resistance-based signals from PT100/PT1000 RTDs in battery thermal management systems. IC Role / Device Role / Timing Role: Constant-current source driver and precision difference amplifier, converting resistance change to calibrated voltage. Use Value: Ultra-low input current prevents self-heating errors in RTD excitation; 1.0 µV/°C offset drift maintains calibration stability across EV battery operating range. |
Use Scenario: Amplifying low-amplitude AC signals from variable reluctance crankshaft position sensors in ignition timing circuits. IC Role / Device Role / Timing Role: High-gain AC-coupled amplifier with adjustable bandwidth, converting magnetic pickup waveform into clean digital-ready pulses. Use Value: 1.5 MHz GBW supports rise-time <1 µs for 10 kHz crank signals; rail-to-rail output ensures logic-level compatibility with MCU inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2474IDR | Lower supply current (600 µA/amp vs 1 mA/amp), but higher input bias current (6 pA vs 150 fA) and narrower temp range (−40°C to +125°C same, but not AEC-Q200 qualified). | Not recommended for high-impedance automotive sensors where femtoamp bias current is critical; suitable for cost-sensitive industrial controls with lower precision needs. | Select TLV2474IDR only if supply current is prioritized over input bias current and AEC-Q200 compliance is not required. |
| OPA4340UA | Higher GBW (5.5 MHz), lower noise (23 nV/√Hz), but limited input common-mode range (to V+ −1.5 V) and no rail-to-rail input capability. | Cannot accept sensor signals exceeding V+ −1.5 V without external clamping; unsuitable for transducers with overvoltage transients or wide common-mode excursions. | Choose OPA4340UA only for high-speed, low-noise applications where input voltage stays strictly within rail-limited range. |
Compared with TLV2474IDR and OPA4340UA, the LMC6494AEM/NOPB uniquely combines femtoamp input bias, true rail-to-rail input/output, and automotive-grade temperature qualification - making it irreplaceable for precision, high-impedance, single-supply sensor interfaces where signal integrity across voltage extremes is non-negotiable.
Availability
LMC6494AEM/NOPB is available at Aetrix Electronics and suitable for automotive pressure sensing, oxygen sensor signal conditioning, temperature monitoring, speed detection, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMC6494AEM/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 its legacy analog portfolio, delivering high-reliability precision amplifiers for automotive, industrial, and medical applications.
The LMC6494AEM/NOPB belongs to TI's legacy precision CMOS op-amp family, engineered specifically for single-supply, high-impedance sensor signal conditioning in harsh environments - emphasizing rail-to-rail operation, ultra-low input current, and extended temperature performance.
FAQ
What is the maximum supply voltage for LMC6494AEM/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMC6494AEM/NOPB is 16V, with recommended operating range from 5V to 15V. Operation above 15V risks exceeding junction temperature limits and degrading long-term reliability, especially at elevated ambient temperatures. The device is fully specified and characterized from 5V to 15V, including parameters like output swing, CMRR, and slew rate.
Does LMC6494AEM/NOPB support rail-to-rail input beyond the supply rails?
Yes, LMC6494AEM/NOPB supports input voltages from V− − 0.25 V to V+ + 0.25 V at room temperature - a true beyond-the-rails capability that prevents phase inversion and nonlinear errors when interfacing with transducers whose outputs exceed supply limits. This is confirmed in the DC Electrical Characteristics table and Application Hints section of the official datasheet.
What is the input bias current specification for LMC6494AEM/NOPB?
The typical input bias current for LMC6494AEM/NOPB is 150 fA, with a guaranteed maximum of 200 pA across temperature. This ultra-low value is critical for high-impedance sensor applications such as oxygen sensors and RTDs, where even picoamp-level currents would introduce measurable offset errors. The specification is measured and guaranteed per channel in the DC Electrical Characteristics table.
Is LMC6494AEM/NOPB qualified for automotive applications?
Yes, LMC6494AEM/NOPB is rated for operation from −40°C to +125°C and was explicitly developed for automotive systems, as stated in the General Description. While not formally AEC-Q200 certified in its original National Semiconductor documentation, its extended temperature range, robust ESD tolerance (2000V HBM), and design focus on under-hood sensor conditioning make it widely deployed in automotive ECUs and subsystems.
What package type does LMC6494AEM/NOPB use?
LMC6494AEM/NOPB uses a 14-pin SOIC (Small Outline Integrated Circuit) package with NS Package Number M14A - 8.65 mm × 3.91 mm body size, 1.27 mm lead pitch, and surface-mount construction. This is confirmed in the Ordering Information and Physical Dimensions sections of the datasheet, and distinguishes it from the 14-pin DIP variant (LMC6494AEN).
LMC6494AEM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- 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:
- 2.6mA (x4 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LMC6494AEM/NOPB FAQ
1.How can I place an order for LMC6494AEM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6494AEM/NOPB 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 LMC6494AEM/NOPB reliable?
The price and inventory of LMC6494AEM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6494AEM/NOPB is usually 5 days.
3.What payment methods are accepted for LMC6494AEM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6494AEM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6494AEM/NOPB?
LMC6494AEM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6494AEM/NOPB 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 LMC6494AEM/NOPB?
For technical support, including LMC6494AEM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6494AEM/NOPB requirements.
6.How does Aetrix verify that LMC6494AEM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC6494AEM/NOPB 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 LMC6494AEM/NOPB meets industry standards.
7.What is the process for return or replacement of LMC6494AEM/NOPB?
All LMC6494AEM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC6494AEM/NOPB, 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 LMC6494AEM/NOPB part is unused and in its original packaging.
Return procedure for LMC6494AEM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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