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Texas Instruments LMC6042AIN
- Part No.:
- LMC6042AIN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LMC6042AIN.pdf
- Description:
- IC CMOS 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,932
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Product details
Overview
LMC6042AIN 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 20 mV of V+ at 5 V), and operates from 4.5 V to 15 V single supply - enabling precision battery-powered pH probe buffers and photodiode preamplifiers.
For engineers reviewing the LMC6042AIN datasheet, LMC6042AIN pinout, LMC6042AIN application, or LMC6042AIN equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional trade-offs for low-leakage analog front-ends.
Technical Context
The LMC6042AIN uses TI's Double-Poly Silicon-Gate CMOS process to achieve sub-femtoamp input leakage and stable operation across −40°C to +85°C. Its output stage connects directly to the internal integrator-bypassing conventional push-pull buffers-to sustain rail-to-rail swing under 100 kΩ loads while maintaining 100 kHz gain-bandwidth and 60° phase margin.
This architecture eliminates need for external pull-down resistors in single-supply configurations and supports direct interfacing with high-impedance transducers (e.g., pH electrodes, piezoelectric sensors) without guard-ring-compromised PCB layouts. Input common-mode range includes ground, and CMRR exceeds 62 dB over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 15 V single supply - enables direct use in 5 V and 12 V battery systems without regulation. |
| Input Bias Current | 2 fA typical - preserves signal integrity in >1012 Ω source impedances (e.g., glass pH electrodes). |
| Rail-to-Rail Output | Swings to within 13 mV of V− and 20 mV of V+ at 5 V - eliminates need for negative rail in sensor buffering. |
| Supply Current | 20 μA per amplifier (typ) - supports >1-year operation on coin-cell batteries in handheld analyzers. |
| Gain-Bandwidth Product | 100 kHz - sufficient for DC–10 kHz transducer signals (e.g., fire/smoke detector ion chambers). |
| Input Common-Mode Range | Includes ground (−0.1 V min at 5 V) - allows direct connection of unipolar sensor outputs to inverting inputs. |
| CMRR | ≥62 dB over −40°C to +85°C - rejects power supply ripple in battery-monitoring circuits. |
Pinout & Package
LMC6042AIN is housed in an 8-pin plastic dual in-line package (PDIP), RoHS-compliant, with 0.300-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; leads are tin-lead free (SN finish).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input (Amplifier A) | High-impedance node requiring guard ring layout; accepts signals down to ground potential. |
| 2 | Non-inverting input (Amplifier A) | Same ultra-low leakage as Pin 1; used for reference or sensor biasing in instrumentation amps. |
| 3 | Output (Amplifier A) | Rail-to-rail sourcing/sinking up to ±13 mA; drives 100 kΩ loads to within 13 mV of rails. |
| 4 | V− (Ground for single supply) | Reference for both amplifiers; must be low-impedance to maintain CMRR and PSRR performance. |
| 5 | Non-inverting input (Amplifier B) | Independent high-Z input; enables dual-channel sensor conditioning (e.g., differential pH + temp). |
| 6 | Inverting input (Amplifier B) | Matches Pin 1 specs; supports matched feedback networks in dual-op-amp instrumentation topologies. |
| 7 | Output (Amplifier B) | Functionally identical to Pin 3; allows independent signal paths without crosstalk >115 dB. |
| 8 | V+ | Single positive supply input; supports 4.5–15 V; thermal derating required above 85°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 2 fA typical enables accurate measurement of picoamp-level currents from photodiodes and ion chambers. |
| Rail-to-rail output without pull-downs | Direct integration-stage output delivers full swing to V−, eliminating external components in single-supply pH buffers. |
| Input common-mode range including ground | Allows direct interface with grounded sensors (e.g., thermistors, silicon transducers) without level-shifting circuitry. |
| Low supply current per channel | 20 μA typ ensures <50 μA total quiescent draw for dual-channel battery monitoring systems. |
| Amp-to-amp isolation | 115 dB prevents crosstalk between channels in dual-sensor applications like smoke detector dual-ion chambers. |
Applications
| Battery Monitoring and Power Conditioning | Photodiode and Infrared Detector Preamplifier |
|---|---|
|
Use Scenario: Monitoring voltage drop across series-connected Li-ion cells in portable medical devices. IC Role / Device Role / Timing Role: Precision buffer amplifier for high-impedance voltage dividers feeding ADC inputs. Use Value: 2 fA input bias avoids loading 10 MΩ dividers, preserving measurement accuracy within ±0.1% over temperature. |
Use Scenario: Converting weak photocurrents from IR flame detectors into measurable voltage signals. IC Role / Device Role / Timing Role: Transimpedance amplifier with TIA configuration and guarded input traces. Use Value: Rail-to-rail output swing ensures full dynamic range utilization even with 0 V to 3.3 V ADC references. |
| pH Probe Buffer Amplifier | Charge Amplifier for Piezoelectric Transducers |
|
Use Scenario: Isolating high-impedance glass electrode outputs in handheld water quality testers. IC Role / Device Role / Timing Role: Unity-gain voltage follower with input guard ring and air-wire layout. Use Value: Input bias current <2 fA prevents electrode polarization drift, enabling stable 0.01 pH resolution. |
Use Scenario: Integrating charge from impact-sensitive piezo elements in industrial vibration monitors. IC Role / Device Role / Timing Role: Low-leakage integrator with feedback capacitor and ultra-stable offset. Use Value: 1 μV/°C offset drift minimizes baseline drift during long-term structural health monitoring. |
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 (vs PDIP); 165°C/W θJA vs 101°C/W; same electrical specs. | Better suited for automated SMT assembly and space-constrained PCBs; requires reflow profile validation. | Select when board area or assembly method favors surface-mount over through-hole. |
| TLV2462IDR | Higher supply current (550 μA/amp), 1 pA IB, 2.5 V to 6 V supply - not single-supply compatible beyond 6 V. | Unsuitable for 9–15 V battery systems; lacks rail-to-rail output swing below 2.5 V. | Consider only for low-voltage (≤5.5 V), higher-speed applications where micropower is secondary. |
Compared with LMC6042AIN, the LMC6042AIM/NOPB offers identical analog performance in a smaller footprint but requires thermal management at elevated ambient temperatures, while TLV2462IDR trades 275× higher supply current for greater bandwidth - making it incompatible with multi-year battery life requirements.
Availability
LMC6042AIN is available at Aetrix Electronics and suitable for battery monitoring, pH sensing, photodiode preamplification, and piezoelectric charge amplification requiring stable component supply across industrial and medical OEM programs.
Supply support for LMC6042AIN 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 specializing in analog and embedded processing technologies, with decades of leadership in precision op-amps and low-power signal chains.
The LMC6042AIN belongs to TI's LMC604x micropower op-amp family, designed specifically for ultra-high-impedance, single-supply sensor interfaces in portable and battery-critical instrumentation.
FAQ
What is the maximum operating temperature range for the LMC6042AIN?
The LMC6042AIN is rated for junction temperatures from −40°C to +85°C. This range is validated per the Absolute Maximum Ratings table and Operating Ratings section of the official SNOS611E datasheet. Operation outside this range may cause parametric shift or reliability degradation. The LMC6042AIN's thermal resistance (θJA) is 101°C/W in PDIP packaging, so ambient temperature must be derated accordingly under load.
Does the LMC6042AIN support true rail-to-rail input common-mode range?
No - the LMC6042AIN features rail-to-rail *output* swing and an input common-mode range that *includes ground*, but does not extend to V+. Per the Electrical Characteristics table, the input common-mode voltage range is specified as −0.1 V (min) to V+ − 2.3 V (max) at room temperature. This allows ground-referenced sensor inputs but excludes V+-referenced signals without level shifting.
Can the LMC6042AIN drive capacitive loads directly?
The LMC6042AIN exhibits reduced phase margin with direct capacitive loading, as noted in the Applications Hints section. Figure 27 shows stability degradation beyond 100 pF. To drive >100 pF loads, TI recommends adding a series resistor (e.g., 100 Ω) between output and load, or using the pull-up resistor technique shown in Figure 31 - where a 500 kΩ resistor to V+ improves settling time without compromising rail-to-rail swing.
Is the LMC6042AIN pin-compatible with other LMC604x variants?
Yes - all LMC604x dual op-amps (including LMC6042AI, LMC6042I, LMC6042AIM/NOPB, and LMC6042IN/NOPB) share identical 8-pin PDIP/SOIC pinouts and electrical functionality. The suffix denotes temperature grade (AI = −40°C to +85°C), package (N = PDIP, M = SOIC), and RoHS status (/NOPB). LMC6042AIN and LMC6042IN/NOPB are functionally interchangeable in PDIP sockets.
What layout techniques are essential when using the LMC6042AIN for sub-picoamp measurements?
TI mandates guard rings surrounding both inputs and feedback nodes, connected to the same potential as the non-inverting input - as detailed in Figures 32–36 of the datasheet. For best results, lift input pins off the PCB and use air wiring (Figure 37), avoid FR-4 near inputs, and clean boards with IPA to remove ionic contamination. Surface leakage >1011 Ω can inject >5 pA error - exceeding the LMC6042AIN's 2 fA spec by 2500×.
LMC6042AIN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LMC6042AIN FAQ
1.How can I place an order for LMC6042AIN through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6042AIN 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 LMC6042AIN reliable?
The price and inventory of LMC6042AIN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6042AIN is usually 5 days.
3.What payment methods are accepted for LMC6042AIN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6042AIN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6042AIN?
LMC6042AIN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6042AIN 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 LMC6042AIN?
For technical support, including LMC6042AIN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6042AIN requirements.
6.How does Aetrix verify that LMC6042AIN is sourced from the original manufacturer or authorized distributors?
All LMC6042AIN 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 LMC6042AIN meets industry standards.
7.What is the process for return or replacement of LMC6042AIN?
All LMC6042AIN units undergo pre-shipment inspection (PSI). If there is an issue with LMC6042AIN, 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 LMC6042AIN part is unused and in its original packaging.
Return procedure for LMC6042AIN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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