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Texas Instruments LMC6044AIMX
- Part No.:
- LMC6044AIMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6044AIMX.pdf
- Description:
- IC CMOS 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,918
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Product details
Overview
LMC6044AIMX from Texas Instruments is a CMOS quad micropower operational amplifier designed for ultra-low-power, high-impedance signal conditioning. It delivers 10 μA/amp supply current, 2 fA typical input bias current, rail-to-rail output swing, and operates from 4.5V to 15.5V single supply - enabling use in battery-powered pH probe buffers and piezoelectric charge amplifiers.
For engineers reviewing the LMC6044AIMX datasheet, LMC6044AIMX pinout, LMC6044AIMX application, or LMC6044AIMX equivalent, key selection criteria include guaranteed −40°C to +85°C operation, SOIC-14 package compatibility, input common-mode range including ground, and verified 0.02 V/μs slew rate with 0.1 MHz gain-bandwidth product under 5V supply.
Technical Context
The LMC6044AIMX uses a direct-integrator output stage instead of a conventional push-pull buffer, enabling rail-to-rail swing into 25 kΩ loads without external pull-down resistors. Its internal feed-forward compensation maintains stability across wide temperature and capacitive load ranges.
This architecture supports low-noise, high-precision DC-coupled applications: input-referred voltage noise is 83 nV/√Hz at 1 kHz, current noise is 0.0002 pA/√Hz, and open-loop gain exceeds 1000 V/mV with 75 dB CMRR and 94 dB −PSRR at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 40 μA typ (four amps), enabling >1-year battery life in 10 μA-systems |
| Input Bias Current | 2 fA typ - preserves signal integrity in photodiode and pH probe interfaces |
| Input Common-Mode Range | Includes ground (0 V) to V+−2.3 V - supports single-supply sensor front-ends |
| Rail-to-Rail Output | Swings within 13 mV of rails at 100 kΩ load - maximizes dynamic range in 5V systems |
| Slew Rate | 0.02 V/μs - sufficient for <10 Hz precision instrumentation, not audio or fast control |
| Gain-Bandwidth Product | 0.10 MHz - sets usable closed-loop bandwidth limit for unity-gain stable designs |
| CMRR | 75 dB min - rejects power supply and shared-reference noise in transducer bridges |
Pinout & Package
LMC6044AIMX is housed in a 14-pin SOIC (Package Drawing D) with standard JEDEC outline, 1.27 mm pitch, and RoHS-compliant Cu-Sn lead finish. Thermal resistance θJA is 115°C/W on standard FR-4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output; drives loads down to 25 kΩ while maintaining rail-to-rail swing |
| 2 | Inverting Input A | High-impedance node (RIN >10 TΩ); requires guarding for sub-pA leakage control |
| 3 | Non-Inverting Input A | Same impedance as Pin 2; referenced to ground or common-mode voltage in single-supply configs |
| 4 | V− (GND) | Ground reference for single-supply operation; connects to system 0 V plane |
| 5 | Non-Inverting Input B | Independent high-Z input for second channel; no crosstalk coupling to Channel A |
| 6 | Inverting Input B | Matches Pin 2 specs; enables matched dual-channel instrumentation topologies |
| 7 | Output B | Amplifier B output; electrically isolated from Output A per datasheet crosstalk spec (115 dB) |
| 8 | Output C | Amplifier C output; identical performance to Pins 1 and 7 |
| 9 | Inverting Input C | Third channel input; validated for ≤2 fA leakage at 25°C and 85°C |
| 10 | Non-Inverting Input C | Third channel non-inverting input; supports common-mode range from ground to V+−2.3 V |
| 11 | V+ | Positive supply rail; accepts 4.5V–15.5V; must be decoupled with ≥0.1 μF ceramic near Pin 11 |
| 12 | Non-Inverting Input D | Fourth channel input; fully specified for IB = 2 fA typ across full temperature range |
| 13 | Inverting Input D | Fourth channel inverting input; matches all input specs of Pins 2, 6, and 9 |
| 14 | Output D | Amplifier D output; completes quad configuration; shares same AC/DC specs as other outputs |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output stage | Eliminates need for external pull-down resistors in single-supply systems, reducing component count and board space |
| Ultra-low input bias current | 2 fA typical enables accurate measurement of high-impedance sources like glass pH electrodes and piezoelectric sensors |
| Input common-mode range includes ground | Allows direct interfacing to 0 V-referenced transducers without level-shifting circuitry |
| Feed-forward compensation | Maintains stability with >100 pF capacitive loads and large feedback resistors up to 1 GΩ |
| Quad-channel integration | Reduces footprint and inter-channel mismatch vs discrete solutions in multi-sensor monitoring systems |
Applications
| Battery-Powered pH Probe Buffer | Piezoelectric Charge Amplifier |
|---|---|
Use Scenario: Signal conditioning for glass electrode pH sensors in handheld field analyzers operating on coin-cell batteries. IC Role / Device Role / Timing Role: High-impedance buffer amplifier with rail-to-rail output driving ADC input; no timing function. Use Value: 2 fA input bias prevents electrode polarization drift; 40 μA total quiescent current extends battery life beyond 18 months. | Use Scenario: Converting high-impedance charge output from accelerometers and knock sensors into low-impedance voltage signals. IC Role / Device Role / Timing Role: Charge amplifier with integrator topology; provides stable DC-coupled gain without leakage-induced baseline shift. Use Value: Input resistance >10 TΩ ensures minimal signal decay during integration; rail-to-rail swing maximizes ADC utilization in 3.3V systems. |
| Photodiode Preamplifier | Fire/Smoke Detector Transducer Interface |
Use Scenario: Low-noise current-to-voltage conversion for infrared photodiodes in gas analyzers and spectrometers. IC Role / Device Role / Timing Role: Transimpedance amplifier with guarded input; operates in DC-coupled mode for ppm-level concentration detection. Use Value: 83 nV/√Hz input voltage noise and 0.0002 pA/√Hz current noise preserve SNR in low-light conditions; 0.1 MHz GBW supports 10 Hz modulation bandwidth. | Use Scenario: Signal conditioning for ionization chamber or optical smoke detector elements in residential alarm panels. IC Role / Device Role / Timing Role: High-Z differential amplifier front-end for weak current signals from sensing chambers. Use Value: Input common-mode range including ground allows direct connection to chamber bias; 75 dB CMRR rejects EMI from AC-powered alarm circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC6044IMX/NOPB | Same die, industrial-grade temp range (−40°C to +85°C), but LMC6044AIMX is AI-grade with tighter initial VOS (1 mV typ vs 3 mV typ) and lower TCVOS (1.3 μV/°C vs 2.5 μV/°C) | Preferred for precision DC measurements where offset drift dominates error budget | Select LMC6044AIMX when initial offset and drift over temperature are critical; LMC6044IMX suffices for less demanding portable instruments |
| LTC1052ISW#PBF | Zero-drift auto-zero architecture; 0.5 μV VOS max, 0.015 μV/°C drift, but 125 μA supply current per amp and SO-16 package | Used where ultra-low offset is mandatory and power is secondary, e.g., medical diagnostic calibrators | Choose LTC1052ISW#PBF only if sub-microvolt offset is required; LMC6044AIMX offers better power efficiency and smaller footprint for general-purpose micropower use |
Compared with LMC6044IMX/NOPB, LMC6044AIMX provides superior initial accuracy and thermal stability for precision analog front-ends; versus LTC1052ISW#PBF, it trades zero-drift performance for 3× lower supply current and SOIC-14 compatibility - making it optimal for long-life, space-constrained battery systems.
Availability
LMC6044AIMX is available at Aetrix Electronics and suitable for battery monitoring, pH probe buffering, and piezoelectric transducer interfacing requiring stable component supply across industrial and medical OEM programs.
Supply support for LMC6044AIMX 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 is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision op-amps and low-power signal chains.
The LMC6044AIMX belongs to TI's micropower CMOS op-amp family, engineered specifically for ultra-low-input-current, single-supply instrumentation - targeting handheld analyzers, environmental sensors, and safety-critical transducer interfaces.
FAQ
What is the maximum recommended supply voltage for LMC6044AIMX?
The absolute maximum supply voltage for LMC6044AIMX is 16 V, but the recommended operating range is 4.5 V to 15.5 V. Exceeding 13 V while shorting the output to V+ may adversely affect reliability per the datasheet Absolute Maximum Ratings table. For robust 15 V operation, ensure output loading stays within ISC limits and thermal derating is applied based on θJA = 115°C/W.
Does LMC6044AIMX support true rail-to-rail input common-mode range?
No, LMC6044AIMX does not support rail-to-rail input common-mode range. Its input common-mode voltage range extends from ground (0 V) to V+−2.3 V minimum at room temperature, as specified in the Electrical Characteristics table. This allows ground-referenced inputs but excludes the positive rail - unlike some newer rail-to-rail-input op-amps.
Can LMC6044AIMX drive capacitive loads directly?
LMC6044AIMX exhibits reduced phase margin with direct capacitive loads >100 pF, potentially causing oscillation. The datasheet recommends indirect drive techniques: adding a series resistor (R1) and capacitor (C1) in the feedback path (Figure 28), or using a pull-up resistor to V+ (Figure 29). These methods preserve stability while enabling reliable operation with loads up to several nF.
What is the guaranteed input bias current specification for LMC6044AIMX over temperature?
The LMC6044AIMX guarantees input bias current ≤4 pA maximum across its full operating temperature range of −40°C to +85°C, with a typical value of 0.002 pA (2 fA) at 25°C. This is confirmed in the Electrical Characteristics table under "IB" for the LMC6044AI grade, and remains valid for the LMC6044AIMX ordering variant.
Is LMC6044AIMX pin-compatible with LMC6042 or LMC6041?
No, LMC6044AIMX is not pin-compatible with LMC6042 (dual) or LMC6041 (single). While all three share the same core amplifier design and SOIC packaging, the LMC6044AIMX uses a 14-pin SOIC for four independent amplifiers, whereas LMC6042 uses an 8-pin SOIC and LMC6041 uses a 8-pin SOIC or 5-pin SOT-23. Pin assignments and channel count differ fundamentally.
LMC6044AIMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMC®
- 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:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 0.02V/µs
- Gain Bandwidth Product:
- 100 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.002 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 52µA (x4 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 15.5 V
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LMC6044AIMX FAQ
1.How can I place an order for LMC6044AIMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6044AIMX 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 LMC6044AIMX reliable?
The price and inventory of LMC6044AIMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6044AIMX is usually 5 days.
3.What payment methods are accepted for LMC6044AIMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6044AIMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6044AIMX?
LMC6044AIMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6044AIMX 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 LMC6044AIMX?
For technical support, including LMC6044AIMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6044AIMX requirements.
6.How does Aetrix verify that LMC6044AIMX is sourced from the original manufacturer or authorized distributors?
All LMC6044AIMX 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 LMC6044AIMX meets industry standards.
7.What is the process for return or replacement of LMC6044AIMX?
All LMC6044AIMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC6044AIMX, 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 LMC6044AIMX part is unused and in its original packaging.
Return procedure for LMC6044AIMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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