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Texas Instruments LMC6042AIJ
- Part No.:
- LMC6042AIJ
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
LMC6042AIJ.pdf
- Description:
- IC CMOS 2 CIRCUIT 8CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,044
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Product details
Overview
LMC6042AIJ 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 both V+ and ground), and operates from 4.5V to 15V single supply - enabling precision battery-powered pH probe buffering and photodiode preamplification.
For engineers reviewing the LMC6042AIJ datasheet, LMC6042AIJ pinout, LMC6042AIJ application, or LMC6042AIJ equivalent, key selection criteria include verified 2 fA input leakage, guaranteed −40°C to +85°C operation, CDIP-8 package thermal performance (θJA = 115°C/W), and compatibility with guarded PCB layouts for sub-picoampere signal integrity.
Technical Context
The LMC6042AIJ uses 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 (>300 V/mV at 100 kΩ). Its feed-forward compensation ensures stability across wide supply (4.5–15.5 V) and temperature (−40°C to +85°C) ranges without external components.
This architecture supports true single-supply operation with input common-mode range extending to ground and output swing within 130 mV of V+ and 60 mV of ground (at V+ = 5 V, RL = 25 kΩ). The device achieves 100 kHz gain-bandwidth product and 0.02 V/μs slew rate while consuming only 20 μA total quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 15.5 V single supply - enables direct integration into 5 V or 12 V battery systems without regulation. |
| Input Bias Current | 2 fA typical - preserves signal integrity in picoampere-level transducer interfaces like pH electrodes and photodiodes. |
| Supply Current per Amp | 10 μA typical - allows two-channel operation at ≤20 μA total, critical for multi-year coin-cell lifetime. |
| Rail-to-Rail Output | Swings to within 60 mV of ground and 130 mV of V+ (V+ = 5 V, RL = 25 kΩ) - maximizes dynamic range in low-voltage systems. |
| Input Common-Mode Range | Includes ground (−0.1 V min) and extends to V+ − 2.3 V - supports direct sensing of 0 V referenced sensors. |
| Gain-Bandwidth Product | 100 kHz - sufficient for DC–10 kHz instrumentation signals (e.g., gas detection, fire alarm analog front-ends). |
| CMRR / PSRR | ≥62 dB (CMRR), ≥62 dB (+PSRR), ≥74 dB (−PSRR) - rejects supply noise and common-mode interference in noisy industrial environments. |
Pinout & Package
LMC6042AIJ is housed in an 8-pin Ceramic Dual In-line Package (CDIP) with 0.300-inch body width, hermetically sealed for high-reliability applications. Thermal resistance θJA = 115°C/W enables stable operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp A) | High-impedance node requiring guard ring layout to preserve 2 fA input leakage spec. |
| 2 | Non-Inverting Input (Amp A) | Accepts signals down to ground; must be guarded identically to Pin 1 for matched bias current. |
| 3 | Output (Amp A) | Capable of sourcing/sinking ≥13 mA; rail-to-rail swing eliminates need for external pull-down resistors. |
| 4 | V− (Ground) | Single-supply reference node; connects directly to system ground plane with low-inductance path. |
| 5 | Non-Inverting Input (Amp B) | Independent channel input; shares same guarding requirements as Pins 1 and 2. |
| 6 | Inverting Input (Amp B) | Matched to Pin 1 in leakage and offset; used for differential configurations or independent signal paths. |
| 7 | Output (Amp B) | Electrically isolated from Pin 3; supports dual-channel instrumentation without crosstalk (115 dB isolation). |
| 8 | V+ | Positive supply rail; accepts 4.5–15.5 V; requires local 0.1 μF ceramic decoupling adjacent to Pin 8. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 2 fA typical - enables accurate measurement of high-impedance sources (e.g., glass pH electrodes >1 GΩ). |
| Rail-to-rail output stage | Direct integrator-based output - delivers full supply swing without external level-shifting or pull resistors. |
| Single-supply operation | Input common-mode includes ground, output swings to ground - eliminates need for negative rail in portable systems. |
| Low power consumption | 20 μA total quiescent current - extends battery life in handheld analyzers and wireless sensor nodes. |
| High CMRR and PSRR | ≥62 dB CMRR, ≥74 dB −PSRR - maintains accuracy in unregulated battery supplies and electrically noisy enclosures. |
Applications
| Hand-Held pH Probe Buffer | Photodiode Preamplifier |
|---|---|
Use Scenario: Portable field meter measuring soil or water acidity using a glass electrode with >1 GΩ output impedance. IC Role / Device Role / Timing Role: High-impedance unity-gain buffer isolating electrode from ADC input, preventing loading-induced drift. Use Value: 2 fA input bias current ensures <0.1 mV error from electrode leakage, preserving ±0.01 pH resolution over 10-year battery life. |
Use Scenario: Low-light detection in smoke/fire sensors using reverse-biased silicon photodiodes generating ~100 fA photocurrent. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal dark-current contribution. Use Value: Sub-femtoampere input bias avoids masking weak photocurrents; rail-to-rail output drives 12-bit SAR ADC directly. |
| Battery Monitoring System | Silicon Transducer Interface |
Use Scenario: Long-life lithium-thionyl chloride battery pack monitoring cell voltage and self-discharge rate over 15 years. IC Role / Device Role / Timing Role: Precision voltage follower feeding low-power ADC, minimizing quiescent drain on primary cell. Use Value: 10 μA/amp supply current reduces system standby power to <50 μA, enabling multi-decade operation without maintenance. |
Use Scenario: Industrial pressure sensor using piezoresistive silicon bridge with mV-level output and >100 MΩ source impedance. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier gain-setting stage with matched input bias for CMR preservation. Use Value: Input bias matching (IOS ≤2 pA max) prevents common-mode error amplification; 115 dB amp-to-amp isolation prevents channel crosstalk. |
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 |
|---|---|---|---|
| LMC6042AIM/NOPB | SOIC-8 package (θJA = 165°C/W), RoHS-compliant, NRND status - higher thermal resistance, no hermetic seal. | Suitable for cost-sensitive commercial PCBs but not high-reliability or extended-temperature deployments. | Select LMC6042AIM/NOPB only if board space constraints prohibit CDIP and ambient temperature remains <60°C. |
| TLV2462IDR | 22 μA/amp supply current, 1 pA input bias, 2.7–6 V supply - lower voltage range, higher leakage, 3× higher power than LMC6042AIJ. | Acceptable for 3.3 V battery systems where 2 fA bias is non-critical, but unsuitable for pH or long-life applications. | Choose TLV2462IDR only when interfacing with 3.3 V microcontrollers and sub-picoampere precision is unnecessary. |
Compared with LMC6042AIM/NOPB, the LMC6042AIJ offers superior thermal reliability and hermetic protection for harsh environments; versus TLV2462IDR, it provides 500× lower input bias and half the supply current, making it irreplaceable in ultra-high-impedance, multi-year battery systems.
Availability
LMC6042AIJ is available at Aetrix Electronics and suitable for battery monitoring, pH probe buffering, and photodiode preamplification requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LMC6042AIJ 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 heritage in precision op-amps and low-power design.
The LMC6042AIJ belongs to TI's micropower CMOS op-amp family engineered specifically for ultra-high-impedance, single-supply instrumentation - targeting medical, environmental, and industrial sensor interfaces where leakage and power define system viability.
FAQ
What is the maximum operating temperature for the LMC6042AIJ?
The LMC6042AIJ is rated for junction temperatures from −40°C to +110°C, with guaranteed operation over −40°C to +85°C ambient. Its CDIP-8 package (θJA = 115°C/W) supports reliable use in industrial enclosures without heatsinking, provided power dissipation stays below 3.5 mW at +85°C ambient.
Does the LMC6042AIJ require external compensation for stability?
No - the LMC6042AIJ incorporates internal feed-forward compensation optimized for unity-gain stability across 4.5–15.5 V supply and −40°C to +85°C. It remains stable driving capacitive loads up to 100 pF directly, though >1 nF loads require external isolation resistor per Figure 30 in the datasheet.
Can the LMC6042AIJ operate from a 3.3 V supply?
No - the LMC6042AIJ has a minimum supply voltage of 4.5 V. Attempting operation below this threshold risks undefined behavior, reduced output swing, and failure to meet input common-mode or rail-to-rail specifications. For 3.3 V systems, consider TI's TLV2462 or LMP7721.
How does the LMC6042AIJ achieve rail-to-rail output with only 20 μA supply current?
The LMC6042AIJ uses a direct-integrator output stage rather than a conventional class-AB buffer. This topology delivers high open-loop gain and low output impedance while avoiding the quiescent current penalty of complementary output transistors - enabling rail-to-rail swing at just 10 μA per amplifier.
Is the LMC6042AIJ pin-compatible with other dual op-amps in SOIC-8 packages?
No - the LMC6042AIJ uses CDIP-8 (NAB drawing), not SOIC-8. While pin numbering matches industry-standard dual op-amps (e.g., Pins 1–3 and 5–7 function identically), the CDIP package has different footprint, thermal, and moisture sensitivity characteristics. Direct PCB replacement requires mechanical redesign.
LMC6042AIJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 8-CDIP
LMC6042AIJ FAQ
1.How can I place an order for LMC6042AIJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6042AIJ 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 LMC6042AIJ reliable?
The price and inventory of LMC6042AIJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6042AIJ is usually 5 days.
3.What payment methods are accepted for LMC6042AIJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6042AIJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6042AIJ?
LMC6042AIJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6042AIJ 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 LMC6042AIJ?
For technical support, including LMC6042AIJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6042AIJ requirements.
6.How does Aetrix verify that LMC6042AIJ is sourced from the original manufacturer or authorized distributors?
All LMC6042AIJ 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 LMC6042AIJ meets industry standards.
7.What is the process for return or replacement of LMC6042AIJ?
All LMC6042AIJ units undergo pre-shipment inspection (PSI). If there is an issue with LMC6042AIJ, 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 LMC6042AIJ part is unused and in its original packaging.
Return procedure for LMC6042AIJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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