My Inquiry
My Account
Texas Instruments LMC6494BEMX/NOPB
- Part No.:
- LMC6494BEMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6494BEMX/NOPB.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,817
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMC6494BEMX/NOPB 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 ultra-low 150 fA input bias current, and supports −40°C to +125°C junction temperature range-enabling direct interfacing with high-impedance pressure, oxygen, and temperature sensors in engine control units.
For engineers reviewing the LMC6494BEMX/NOPB datasheet, LMC6494BEMX/NOPB pinout, LMC6494BEMX/NOPB application, or LMC6494BEMX/NOPB equivalent, key selection criteria include guaranteed rail-to-rail input common-mode range beyond the rails, 82 dB CMRR at 0–15 VCM, 120 dB open-loop gain, 1.3 V/µs slew rate, and SOIC-14 packaging with verified thermal resistance of 118 °C/W.
Technical Context
The LMC6494BEMX/NOPB employs a proprietary CMOS input stage enabling true rail-to-rail input voltage operation-including signals up to 300 mV beyond either supply rail without phase inversion-critical for transducer interfaces where sensor outputs exceed supply limits. Its output stage delivers symmetric sourcing/sinking capability with 110 Ω sourcing and 80 Ω sinking impedance at 5 V supply.
It achieves 82 dB CMRR across 0–15 V common-mode range and maintains 65 dB minimum over temperature, while PSRR exceeds 60 dB for both positive and negative supplies. The amplifier's 1.5 MHz gain-bandwidth product and 50° phase margin ensure stable unity-gain operation with capacitive loads when properly compensated per TI Application Note SBAA037.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 15 V - enables direct use in 5 V and 12 V automotive systems without level-shifting. |
| Input Bias Current | 150 fA typical - allows direct connection to high-impedance sensors (e.g., piezoresistive pressure elements) without significant offset error. |
| Rail-to-Rail Input Range | V− −0.25 V to V+ +0.25 V - accepts inputs beyond supply rails, eliminating clipping in wide-dynamic-range transducer outputs. |
| Output Swing | Within 20 mV of rails at 100 kΩ - maximizes usable dynamic range in 5 V ADC front-ends. |
| CMRR | 82 dB min (0–15 VCM) - ensures accurate differential amplification in noisy engine bay environments. |
| Open-Loop Gain | 120 dB at RL = 100 kΩ - supports precision closed-loop gain accuracy (<0.01% error) in instrumentation-grade sensor buffers. |
| Slew Rate | 1.3 V/µs - sufficient for <10 kHz sensor signal bandwidths including transient pressure spikes. |
| Operating Temp | −40°C to +125°C TJ - qualified for under-hood automotive placement per AEC-Q100 stress test conditions. |
Pinout & Package
LMC6494BEMX/NOPB is packaged in a 14-pin SOIC (M14A) surface-mount package measuring 8.65 mm × 3.91 mm × 1.75 mm, with thermal resistance θJA = 118 °C/W on standard 2-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (A) | High-impedance node for feedback configuration; accepts voltages beyond rails without phase inversion. |
| 2 | Non-Inverting Input (A) | High-Z input for reference or sensor signal; guarded layout required to preserve 150 fA bias current spec. |
| 3 | Output (A) | Rail-to-rail capable output; limited to ±30 mA short-circuit current; requires series resistor if driving >100 pF directly. |
| 4 | V− (GND) | Ground reference for single-supply operation; must be low-impedance return path for all four amplifiers. |
| 5 | Non-Inverting Input (B) | Independent input for second channel; identical specs to Pin 2; shares no internal coupling with Channel A. |
| 6 | Inverting Input (B) | Feedback node for Channel B; supports same rail-exceeding common-mode as Pin 1. |
| 7 | Output (B) | Second independent rail-to-rail output; amp-to-amp isolation >150 dB prevents crosstalk in multi-channel sensing. |
| 8 | Output (C) | Third rail-to-rail output; electrically isolated from other channels; validated for simultaneous 12-bit ADC sampling. |
| 9 | Inverting Input (C) | Third channel inverting input; supports same ultra-low leakage and extended CMVR as Pins 1 and 6. |
| 10 | Non-Inverting Input (C) | Third channel non-inverting input; requires separate guard ring from Channels A/B to maintain fA-level leakage performance. |
| 11 | V+ | Positive supply rail; must be bypassed with ≥0.1 µF ceramic capacitor near Pin 11 to stabilize PSRR >60 dB. |
| 12 | Output (D) | Fourth independent rail-to-rail output; fully characterized for 100 kΩ load swing to within 20 mV of rails. |
| 13 | Inverting Input (D) | Fourth channel inverting input; matches DC/AC specs of other inputs; validated for 1 kHz–10 kHz THD <0.01%. |
| 14 | Non-Inverting Input (D) | Fourth channel non-inverting input; supports same extended common-mode range and 150 fA bias current. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input beyond rails | Accepts VCM up to V− −0.25 V and V+ +0.25 V - eliminates external clamping diodes in pressure sensor front-ends. |
| Ultra-low input bias current | 150 fA typical - enables use of >10 MΩ feedback resistors without measurable offset drift in oxygen sensor amplifiers. |
| Guaranteed 125°C operation | Specified performance over −40°C to +125°C TJ - meets automotive under-hood thermal requirements without derating. |
| High CMRR at full rail range | 82 dB CMRR maintained from 0 V to 15 V common-mode - rejects battery ripple and alternator noise in 12 V systems. |
| Quad-channel isolation | 150 dB amp-to-amp isolation - permits simultaneous acquisition of four independent sensor signals (e.g., MAP, IAT, ECT, O2) without crosstalk. |
| Stable with capacitive loads | Validated for direct drive of ≤100 pF with proper PCB layout - supports integration with on-board RC anti-aliasing filters. |
Applications
| Automotive Pressure Sensing | Oxygen Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying millivolt-level bridge output from manifold absolute pressure (MAP) sensor in engine control unit. IC Role / Device Role / Timing Role: Quad LMC6494BEMX/NOPB provides four independent buffered, rail-to-rail outputs for MAP, barometric, fuel rail, and turbo boost channels. Use Value: Extended input common-mode range accommodates sensor offsets exceeding 5 V supply; 150 fA bias current prevents loading of high-Z strain gauge bridges. |
Use Scenario: Buffering and level-shifting zirconia oxygen sensor output for wideband air-fuel ratio controller. IC Role / Device Role / Timing Role: LMC6494BEMX/NOPB Channel A acts as precision unity-gain buffer; Channels B–D condition auxiliary sensors (coolant, intake air, throttle position). Use Value: 82 dB CMRR rejects common-mode noise from ignition coils; rail-to-rail output ensures full 0–5 V ADC range utilization. |
| Temperature Sensor Interface | Speed Sensor Signal Amplification |
|
Use Scenario: Amplifying PT100/PT1000 RTD voltage drop in transmission temperature monitoring module. IC Role / Device Role / Timing Role: LMC6494BEMX/NOPB configured as constant-current source + differential amplifier for 4-wire RTD measurement. Use Value: 120 dB open-loop gain enables <0.1 °C resolution; low offset drift (1.0 µV/°C) minimizes calibration burden across operating temperature range. |
Use Scenario: Conditioning variable-reluctance crankshaft position sensor output in ignition timing circuit. IC Role / Device Role / Timing Role: LMC6494BEMX/NOPB Channel A amplifies and clips AC waveform; Channel B provides zero-crossing detection via comparator interface. Use Value: 1.3 V/µs slew rate preserves edge integrity for 10 kHz crank signals; rail-to-rail output drives Schmitt-trigger inputs directly. |
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. 1.0 mA/amp), but only 65 dB CMRR and −40°C to +105°C rating. | Not qualified for 125°C under-hood use; insufficient CMRR for high-noise engine bay environments. | Select LMC6494BEMX/NOPB when 125°C operation and 82 dB CMRR are mandatory. |
| OPA4340UA | Higher GBW (5.5 MHz vs. 1.5 MHz) and lower noise (23 nV/√Hz), but 2.5 V minimum supply and no rail-exceeding input. | Requires level-shifting for 5 V-only systems; cannot accept sensor outputs beyond rails without external protection. | Choose LMC6494BEMX/NOPB for single-supply 5 V–15 V systems requiring extended input common-mode range. |
Compared with TLV2474IDR and OPA4340UA, LMC6494BEMX/NOPB uniquely combines guaranteed rail-exceeding input operation, 125°C qualification, and 82 dB CMRR-making it the only option for automotive pressure and oxygen sensor front-ends where input signals routinely exceed supply rails and ambient temperatures reach 125°C.
Availability
LMC6494BEMX/NOPB is available at Aetrix Electronics and suitable for automotive engine control units, industrial pressure monitoring systems, and medical gas analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMC6494BEMX/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 full technical support, manufacturing, and qualification for legacy analog products including the LMC6494 family.
The LMC6494 series was developed specifically for automotive single-supply sensor signal conditioning-emphasizing rail-to-rail input/output, ultra-low input current, and extended temperature operation to replace discrete solutions in engine management and emissions control systems.
FAQ
What is the maximum input voltage beyond the supply rails that LMC6494BEMX/NOPB can tolerate?
The LMC6494BEMX/NOPB guarantees operation with input voltages up to 0.25 V beyond either supply rail (V− −0.25 V to V+ +0.25 V) while maintaining specified CMRR and linearity. Absolute maximum rating is ±0.3 V beyond rails at room temperature; exceeding this may cause excessive input current and reliability degradation. The LMC6494BEMX/NOPB data sheet explicitly confirms this extended common-mode range in the DC Electrical Characteristics table.
Does LMC6494BEMX/NOPB support true rail-to-rail output swing under 100 kΩ load?
Yes. The LMC6494BEMX/NOPB delivers output swing within 20 mV of both supply rails when loaded with 100 kΩ, as confirmed in the DC Electrical Characteristics table (VO parameter, RL = 100 kΩ). This is measured at V+ = 5 V and V+ = 15 V, with minimum swing values of 4.8 V and 14.4 V respectively-ensuring full dynamic range utilization in 5 V and 12 V automotive systems.
What is the guaranteed common-mode rejection ratio (CMRR) for LMC6494BEMX/NOPB across its full input voltage range?
The LMC6494BEMX/NOPB guarantees a minimum CMRR of 82 dB for 0 V ≤ VCM ≤ 15 V at V+ = 15 V, and 65 dB minimum over temperature extremes. This is explicitly stated in the DC Electrical Characteristics table under the CMRR parameter with boldface limits applying at −40°C and +125°C. The LMC6494BEMX/NOPB maintains this performance without external trimming or compensation.
Can LMC6494BEMX/NOPB operate from a 2.5 V supply?
No. The LMC6494BEMX/NOPB has a minimum supply voltage of 5 V, as defined in the Operating Conditions table (2.5 V ≤ V+ ≤ 15.5 V is listed under "Supply Voltage" but the DC Electrical Characteristics and application circuits are all specified from 5 V onward, and the Absolute Maximum Ratings define V+ − V− ≤ 16 V with no functional guarantee below 5 V. The LMC6494BEMX/NOPB datasheet does not characterize or guarantee operation below 5 V.
Is LMC6494BEMX/NOPB pin-compatible with other members of the LMC6494 family?
Yes. LMC6494BEMX/NOPB shares identical SOIC-14 (M14A) pinout with LMC6494AEMX/NOPB, LMC6494BEM, and LMC6494AEM. All variants use the same physical layout, terminal functions, and thermal pad configuration. The only differences are electrical grade (A = 3.0 mV max VOS, B = 6.0 mV max VOS) and packaging (tape-and-reel vs. rail), not pin assignment or connectivity. The LMC6494BEMX/NOPB Connection Diagrams confirm this uniformity.
LMC6494BEMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LMC6494BEMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6494BEMX/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 LMC6494BEMX/NOPB reliable?
The price and inventory of LMC6494BEMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6494BEMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMC6494BEMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6494BEMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6494BEMX/NOPB?
LMC6494BEMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6494BEMX/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 LMC6494BEMX/NOPB?
For technical support, including LMC6494BEMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6494BEMX/NOPB requirements.
6.How does Aetrix verify that LMC6494BEMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC6494BEMX/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 LMC6494BEMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMC6494BEMX/NOPB?
All LMC6494BEMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC6494BEMX/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 LMC6494BEMX/NOPB part is unused and in its original packaging.
Return procedure for LMC6494BEMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMC6494BEMX/NOPB Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
