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Texas Instruments LMC6042IMX
- Part No.:
- LMC6042IMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6042IMX.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,960
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Product details
Overview
LMC6042IMX from Texas Instruments is a dual CMOS micropower operational amplifier optimized for ultra-low-power, high-impedance signal conditioning. It delivers 2 fA typical input bias current, 10 μA/amp supply current, rail-to-rail output swing (to within 13 mV of V− and 10 mV of V+ at 5 V), and operates from 4.5 V to 15 V single supply - enabling use in battery-powered pH probe buffers and photodiode preamplifiers.
For engineers reviewing the LMC6042IMX datasheet, LMC6042IMX pinout, LMC6042IMX application, or LMC6042IMX equivalent, key selection criteria include verified 2 fA input leakage, guaranteed −40°C to +85°C operation, SOIC-8 packaging with 165°C/W θJA, and confirmed compatibility with high-impedance transducer interfaces requiring no external pull-downs.
Technical Context
The LMC6042IMX employs a direct-integrator output stage instead of a conventional push-pull buffer, enabling rail-to-rail swing under load while maintaining low output impedance and high open-loop gain. Its feed-forward compensation ensures stability across wide supply (4.5–15 V) and temperature (−40°C to +85°C) ranges without external components.
This architecture supports true ground-sensing input common-mode range (down to −0.1 V at V+ = 5 V) and eliminates need for level-shifting circuitry in single-supply instrumentation. Input resistance exceeds 10 TΩ, and phase margin remains ≥60° at unity-gain configuration with 100 kHz GBW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 15 V single supply - enables direct integration into 5 V and 12 V battery systems without regulation. |
| Input Bias Current | 2 fA typical - preserves signal integrity in picoamp-level sensor interfaces like pH electrodes and photodiodes. |
| Supply Current per Amp | 10 μA typical - allows two-channel operation at <20 μA total, extending battery life in portable analyzers. |
| Rail-to-Rail Output | Swings to within 13 mV of V− and 10 mV of V+ at 5 V - eliminates need for negative rail or pull-down resistors in single-supply designs. |
| Input Common-Mode Range | Includes ground (−0.1 V min at V+ = 5 V) - supports direct connection of grounded sensors without AC coupling. |
| Gain-Bandwidth Product | 100 kHz - sufficient for DC-coupled transducer amplification and low-frequency filtering up to ~10 kHz. |
| CMRR | 62 dB minimum (V+ = 15 V) - provides adequate rejection of supply noise in unregulated battery rails. |
Pinout & Package
LMC6042IMX is housed in an 8-pin SOIC package (JEDEC MS-012, variation AA), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, RoHS-compliant with Sn lead finish and Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp A) | High-impedance node accepting differential signals; requires guarding for sub-pA leakage control. |
| 2 | Non-Inverting Input (Amp A) | Ground-referenced or biased input; supports direct connection to grounded transducers. |
| 3 | Output (Amp A) | Rail-to-rail capable output driving ≥100 kΩ loads; sinks 13 mA / sources 16 mA at V+ = 5 V. |
| 4 | V− (Ground) | Single-supply reference node; must be low-impedance to minimize ground bounce in high-Z circuits. |
| 5 | Non-Inverting Input (Amp B) | Independent second channel input; identical electrical specs to Pin 2. |
| 6 | Inverting Input (Amp B) | Second channel inverting input; layout symmetry critical for matched performance in instrumentation amps. |
| 7 | Output (Amp B) | Second rail-to-rail output; usable for dual-channel buffering or independent signal paths. |
| 8 | V+ | Positive supply rail; accepts 4.5–15 V; decoupling capacitor required near pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 2 fA typical enables accurate measurement of nanoamp-level photocurrents without offset drift. |
| Rail-to-rail output stage | Direct integrator-based output delivers full dynamic range without external level-shifting components. |
| Ground-sensing input range | Common-mode voltage includes ground, allowing direct interface with grounded sensors like pH probes. |
| Stable capacitive load drive | Feed-forward compensation maintains ≥60° phase margin even with >100 pF load when using recommended layout. |
| Low power supply current | 10 μA/amp operation permits dual-channel sensing in energy-constrained devices such as handheld gas detectors. |
Applications
| Battery-Powered pH Probe Buffer | Photodiode Preamplifier |
|---|---|
Use Scenario: Portable field meter measuring soil or liquid acidity using glass electrode with high output impedance (>1 GΩ). IC Role / Device Role / Timing Role: High-impedance voltage follower isolating electrode from ADC input while preserving mV-level accuracy. Use Value: 2 fA input bias prevents electrode polarization error; rail-to-rail swing maximizes ADC utilization with 3.3 V supply. | Use Scenario: Low-light detection in smoke alarm using silicon photodiode generating 10–100 pA photocurrent. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to measurable voltage with minimal dark-current contribution. Use Value: Sub-femtoamp input leakage avoids signal masking; 100 kHz GBW supports pulse detection up to 10 kHz. |
| Silicon Transducer Signal Conditioning | Fire Detection Charge Amplifier |
Use Scenario: Handheld pressure gauge using piezoresistive silicon sensor with millivolt output and microamp bias requirements. IC Role / Device Role / Timing Role: Precision non-inverting amplifier with gain of 100, rejecting common-mode noise from shared supply. Use Value: 62 dB CMRR suppresses supply ripple; 4.5 V min supply allows operation directly from two AA cells. | Use Scenario: Ionization chamber in fire alarm requiring charge integration from alpha particles over 100 ms windows. IC Role / Device Role / Timing Role: Low-leakage integrator converting ion current to voltage ramp, reset by external switch. Use Value: 10 TΩ input resistance limits integration drift to <1 mV/s; 10 μA supply enables 5-year battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC6042IM/NOPB | Same die, identical electrical specs, but supplied in 95-unit tape-and-reel vs. 2500-unit reel for LMC6042IMX/NOPB. | No functional difference; suited for prototyping or low-volume production where smaller reels reduce inventory cost. | Select LMC6042IM/NOPB for evaluation or pilot runs; LMC6042IMX/NOPB for volume manufacturing. |
| TLV2462IDR | Higher 550 nA input bias current, 550 μA supply current, and 6.5 V max supply - lacks ground-sensing input and rail-to-rail output swing. | Not suitable for pA-level transducers or battery systems below 6 V; limited to mid-power industrial signal chains. | Choose TLV2462IDR only if higher speed (6.4 MHz GBW) and drive strength outweigh ultra-low leakage needs. |
Compared with LMC6042IMX, LMC6042IM/NOPB offers identical performance in smaller packaging logistics, while TLV2462IDR trades 275× higher input current and 55× higher supply draw for greater bandwidth - making LMC6042IMX irreplaceable in femtoamp-critical, battery-limited designs.
Availability
LMC6042IMX is available at Aetrix Electronics and suitable for battery monitoring, photodiode preamplification, and pH probe buffering requiring stable component supply across industrial and medical OEM programs.
Supply support for LMC6042IMX 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LMC6042IMX belongs to TI's precision micropower op-amp product line, engineered specifically for ultra-low-input-current, single-supply instrumentation in portable and energy-harvesting systems.
FAQ
What is the maximum operating temperature range for the LMC6042IMX?
The LMC6042IMX is rated for junction temperatures from −40°C to +85°C. This industrial-grade temperature range is ensured per Electrical Characteristics test conditions and applies to both LMC6042I and LMC6042AI variants. Operation outside this range may result in parametric degradation or reliability risk, and thermal derating must follow θJA = 165°C/W for the SOIC-8 package.
Does the LMC6042IMX support true rail-to-rail input common-mode range?
No - the LMC6042IMX supports rail-to-rail *output* swing and an input common-mode range that *includes ground*, but does not extend to V+. At V+ = 5 V, the guaranteed input common-mode range is −0.1 V to V+ − 2.3 V (i.e., up to 2.7 V). This design enables ground-referenced sensor interfacing while maintaining CMRR ≥50 dB, as specified in the Electrical Characteristics table.
Can the LMC6042IMX drive capacitive loads directly without external compensation?
The LMC6042IMX exhibits improved capacitive load tolerance due to its feed-forward compensation, but direct drive of >100 pF loads risks instability. Figure 27 and Figure 28 in the datasheet show phase margin erosion beyond 100 pF. For reliable operation, TI recommends either adding a series resistor (e.g., 100 Ω) between output and load or using the pull-up resistor technique shown in Figure 31 - both validated methods for maintaining stability with LMC6042IMX.
Is the LMC6042IMX pin-compatible with other members of the LMC604x family?
Yes - the LMC6042IMX shares identical 8-pin SOIC pinout with LMC6042IM/NOPB, LMC6042AIMX/NOPB, and LMC6042IN/NOPB. All LMC6042 variants (dual) use the same pin mapping regardless of grade (I vs AI) or package (SOIC vs PDIP). However, it is not pin-compatible with LMC6041 (single) or LMC6044 (quad), which use different pin counts and assignments.
What is the typical input offset voltage for the LMC6042IMX at room temperature?
The typical input offset voltage for the LMC6042IMX is 1 mV at TA = 25°C, with a maximum limit of 6 mV across the full −40°C to +85°C operating range. This value is specified for the LMC6042I grade (standard industrial version); the LMC6042AI grade offers tighter 3 mV max. Both grades maintain 1.3 μV/°C average drift, ensuring predictable offset behavior in thermally varying environments.
LMC6042IMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- 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:
- 26µA (x2 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:
- 8-SOIC
LMC6042IMX FAQ
1.How can I place an order for LMC6042IMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6042IMX 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 LMC6042IMX reliable?
The price and inventory of LMC6042IMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6042IMX is usually 5 days.
3.What payment methods are accepted for LMC6042IMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6042IMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6042IMX?
LMC6042IMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6042IMX 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 LMC6042IMX?
For technical support, including LMC6042IMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6042IMX requirements.
6.How does Aetrix verify that LMC6042IMX is sourced from the original manufacturer or authorized distributors?
All LMC6042IMX 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 LMC6042IMX meets industry standards.
7.What is the process for return or replacement of LMC6042IMX?
All LMC6042IMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC6042IMX, 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 LMC6042IMX part is unused and in its original packaging.
Return procedure for LMC6042IMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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