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Texas Instruments LMC6494BEMX
- Part No.:
- LMC6494BEMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6494BEMX.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,033
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Product details
Overview
LMC6494BEMX from Texas Instruments (formerly National Semiconductor) is a quad 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 typical input bias current, 82 dB CMRR, and −40°C to +125°C operating temperature range - enabling high-accuracy transducer amplification in engine control units and exhaust systems.
For engineers reviewing the LMC6494BEMX datasheet, LMC6494BEMX pinout, LMC6494BEMX application, or LMC6494BEMX equivalent, key selection criteria include ultra-low input current for high-impedance sensor interfacing, guaranteed rail-to-rail operation over full temperature range, CMRR stability across common-mode voltage extremes, and SOIC-14 package compatibility with automotive PCB layout constraints.
Technical Context
The LMC6494BEMX employs a proprietary CMOS input stage enabling input common-mode voltage range extending 300 mV beyond both supply rails without phase inversion - critical for unregulated sensor outputs in automotive environments. Its rail-to-rail output stage uses complementary push-pull circuitry with 110 Ω sourcing / 80 Ω sinking output impedance at 5V supply, ensuring minimal signal loss into moderate loads.
DC precision is maintained via 1.0 µV/°C input offset drift and 6.0 mV max input offset voltage (LMC6494BE grade), while AC performance includes 1.5 MHz gain-bandwidth product and 1.3 V/µs slew rate at 15V supply - supporting stable closed-loop operation in DC-coupled sensor front-ends and low-pass filtering up to ~100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5V to 15V - supports direct connection to automotive battery-derived rails without regulation. |
| Input Bias Current | 150 fA typical - enables direct interfacing with high-impedance sensors (e.g., piezoresistive pressure elements) without significant offset error. |
| CMRR | 82 dB minimum (0–5V VCM) - ensures accurate differential amplification in noisy engine bay environments. |
| Output Swing | Within 20 mV of rails at 100 kΩ - maximizes dynamic range in 5V ADC interfaces, preserving >99% of full-scale resolution. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood placement in modern ICE and hybrid powertrain control modules. |
| Gain-Bandwidth Product | 1.5 MHz - sufficient for anti-aliasing filters and closed-loop bandwidths up to ~100 kHz with unity-gain stability. |
| Input Offset Drift | 1.0 µV/°C - limits thermal-induced error to <120 µV over full temperature range, critical for calibrated sensor outputs. |
Pinout & Package
LMC6494BEMX is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package per NS Package Number M14A, with 1.27 mm lead pitch and 8.65 mm × 3.91 mm body dimensions - compatible with standard surface-mount assembly processes and automotive-grade reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amplifier A) | Accepts differential signal from sensor bridge; supports common-mode voltages beyond rails. |
| 2 | Non-Inverting Input (Amplifier A) | Reference or sensor leg input; matched impedance critical for CMRR performance. |
| 3 | Output (Amplifier A) | Rail-to-rail output capable of sourcing/sinking ±30 mA; drives 600 Ω loads to 90% of rail. |
| 4 | V− (Ground/Return) | Single-supply reference node; must be low-impedance for PSRR integrity. |
| 5 | Non-Inverting Input (Amplifier B) | Second channel input; electrically isolated from Channel A per datasheet isolation spec (150 dB). |
| 6 | Inverting Input (Amplifier B) | Independent differential input path; no crosstalk impact on Channel A below −120 dB. |
| 7 | Output (Amplifier B) | Independent rail-to-rail output; shares V− but maintains channel separation. |
| 8 | V+ (Supply) | Positive supply input; accepts 5–15V; internal regulation not required. |
| 9 | Output (Amplifier C) | Third independent amplifier output; identical specs to Channels A/B. |
| 10 | Inverting Input (Amplifier C) | Third channel inverting input; fully decoupled per amp-to-amp isolation test data. |
| 11 | Non-Inverting Input (Amplifier C) | Third channel non-inverting input; matches input capacitance (3 pF) and resistance (>10 TΩ) of other channels. |
| 12 | Output (Amplifier D) | Fourth rail-to-rail output; enables multi-sensor signal conditioning on single IC. |
| 13 | Inverting Input (Amplifier D) | Fourth channel inverting input; validated for same input voltage range (V−−0.25V to V++0.25V). |
| 14 | Non-Inverting Input (Amplifier D) | Fourth channel non-inverting input; supports same ultra-low leakage interface as other inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input beyond rails | Supports input signals up to 300 mV beyond V+ or V− without phase inversion - eliminates external level-shifting for unregulated sensor outputs. |
| Ultra-low input bias current | 150 fA typical enables use with >1 GΩ source impedances (e.g., oxygen sensor electrodes) without measurable offset shift. |
| High CMRR over full VCM range | 82 dB maintained from 0V to 5V common-mode voltage - preserves accuracy in noisy 12V automotive ground-referenced systems. |
| Quad-channel integration | Four independent amplifiers in SOIC-14 reduce board space vs discrete solutions - ideal for multi-parameter sensor modules (e.g., pressure + temp + speed). |
| Automotive temperature qualification | −40°C to +125°C operation verified per datasheet conditions - meets AEC-Q100 stress test requirements for under-hood deployment. |
Applications
| Automotive Transducer Amplifier | Pressure Sensor Interface |
|---|---|
|
Use Scenario: Signal conditioning of piezoresistive manifold absolute pressure (MAP) sensors in engine control units. IC Role / Device Role / Timing Role: Quad amplifier configures two channels as bridge differential amplifiers and two as reference buffers for ratiometric ADC excitation. Use Value: Rail-to-rail input accommodates sensor offset drift beyond supply rails; 150 fA input current prevents loading of high-Z bridge elements. |
Use Scenario: Amplifying output of MEMS-based barometric pressure sensors in climate control and turbocharger boost monitoring. IC Role / Device Role / Timing Role: Single-channel instrumentation amplifier with matched external resistors; remaining channels condition auxiliary temperature or humidity signals. Use Value: 82 dB CMRR rejects common-mode noise from HVAC motor drivers; 1.0 µV/°C drift ensures stable calibration across under-dash temperature swings. |
| Oxygen Sensor Signal Conditioning | Temperature Sensor Front-End |
|
Use Scenario: Interfacing zirconia-based exhaust oxygen sensors requiring high-impedance voltage measurement. IC Role / Device Role / Timing Role: Non-inverting amplifier with guard-ring PCB layout; dedicated channel for reference voltage buffering. Use Value: 150 fA input current avoids sensor polarization errors; rail-to-rail output drives 5V ADC directly without level-shifting components. |
Use Scenario: Linearizing and amplifying RTD or thermistor outputs in battery management and transmission control modules. IC Role / Device Role / Timing Role: Precision difference amplifier for 3-wire RTD configurations; fourth channel implements cold-junction compensation. Use Value: 6.0 mV max input offset voltage minimizes zero-error in 0–150°C range; 1.5 MHz GBW supports fast thermal transient response. |
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 |
|---|---|---|---|
| TLC27L4CDR | Lower supply current (125 µA/amp) but higher input offset (10 mV max) and narrower VCM range (0 to V+−1.5V). | Not suitable for automotive sensors requiring rail-to-rail input beyond supplies or >100°C operation. | Select only for low-power, non-automotive industrial applications where input voltage stays within rails. |
| OPA4340UA | Higher GBW (5.5 MHz) and lower noise (16 nV/√Hz), but limited temperature range (−40°C to +85°C) and no extended VCM beyond rails. | Unqualified for under-hood use; requires external clamping for sensor overvoltage protection. | Prefer for precision lab equipment or consumer electronics where full automotive temp range is unnecessary. |
Compared with TLC27L4CDR and OPA4340UA, the LMC6494BEMX uniquely combines rail-to-rail input beyond supplies, 125°C operation, and 150 fA input current - making it the only option among the three qualified for direct integration into AEC-Q100-compliant engine control sensor front-ends without additional protection circuitry.
Availability
LMC6494BEMX 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 production lifecycles.
Supply support for LMC6494BEMX 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 precision analog portfolio, including rail-to-rail op-amps engineered for high-reliability industrial and automotive applications.
The LMC6494BEMX belongs to National Semiconductor's LMC64xx family of CMOS rail-to-rail op-amps, designed specifically for single-supply sensor signal conditioning in harsh environments where input voltage may exceed supply rails and temperature extremes demand guaranteed parametric performance.
FAQ
What is the maximum input voltage range supported by the LMC6494BEMX?
The LMC6494BEMX supports an input common-mode voltage range from V−−0.25V to V++0.25V at room temperature, with absolute maximum ratings allowing ±300 mV beyond either supply rail. This enables direct connection to unregulated sensor outputs that may transiently exceed the supply rails - a key requirement for automotive pressure and oxygen sensors. Operation outside this range requires external current-limiting resistors per Figure 3 in the datasheet.
Does the LMC6494BEMX require external compensation for capacitive loads?
Yes, the LMC6494BEMX exhibits reduced phase margin when driving capacitive loads directly due to its output stage topology. For stable operation with >100 pF loads, TI recommends adding a series resistor (typically 10–100 Ω) between the output and the capacitive load, or using the compensated configuration shown in Figure 5 of the datasheet. Direct capacitive loading without isolation can cause oscillation or overshoot in pulse responses.
Is the LMC6494BEMX pin-compatible with other LMC6494 variants?
Yes, the LMC6494BEMX is pin-compatible with all LMC6494 variants in the SOIC-14 package, including LMC6494AEMX, LMC6494AEM, and LMC6494BEM. The 'B' grade specifies tighter input offset voltage (6.0 mV max vs 3.8 mV max for 'A') and same temperature range (−40°C to +125°C), with identical pinout, electrical interface, and package dimensions - enabling drop-in replacement during design optimization.
What is the typical supply current consumption of the LMC6494BEMX at 5V operation?
The LMC6494BEMX draws 2.0 mA typical supply current at V+ = 5V and room temperature, with a maximum of 4.2 mA across temperature and process variation. This value represents total quiescent current for all four amplifiers - approximately 500 µA per amplifier - making it suitable for always-on automotive subsystems where standby power budget is constrained.
Can the LMC6494BEMX be used in dual-supply configurations?
Yes, the LMC6494BEMX supports dual-supply operation with V+ and V− pins referenced to positive and negative rails (e.g., ±5V). Its rail-to-rail input and output stages function identically in dual-supply mode, maintaining the same 150 fA input bias current and 82 dB CMRR. However, the device is optimized for single-supply use, and the datasheet specifies guaranteed performance only for V+ ≥ 2.5V and V− ≤ 0V in automotive applications.
LMC6494BEMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LMC6494BEMX FAQ
1.How can I place an order for LMC6494BEMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6494BEMX 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 LMC6494BEMX reliable?
The price and inventory of LMC6494BEMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6494BEMX is usually 5 days.
3.What payment methods are accepted for LMC6494BEMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6494BEMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6494BEMX?
LMC6494BEMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6494BEMX 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 LMC6494BEMX?
For technical support, including LMC6494BEMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6494BEMX requirements.
6.How does Aetrix verify that LMC6494BEMX is sourced from the original manufacturer or authorized distributors?
All LMC6494BEMX 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 LMC6494BEMX meets industry standards.
7.What is the process for return or replacement of LMC6494BEMX?
All LMC6494BEMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC6494BEMX, 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 LMC6494BEMX part is unused and in its original packaging.
Return procedure for LMC6494BEMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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