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Texas Instruments LMC6042AIM/NOPB
- Part No.:
- LMC6042AIM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6042AIM/NOPB.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:713
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Product details
Overview
LMC6042AIM/NOPB 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 12 mV of rails at VS = 5 V), and operates from 4.5 V to 15 V single supply - enabling precision battery-powered pH probes, photodiode preamplifiers, and silicon transducer interfaces.
For engineers reviewing the LMC6042AIM/NOPB datasheet, LMC6042AIM/NOPB pinout, LMC6042AIM/NOPB application, or LMC6042AIM/NOPB equivalent, key selection criteria include confirmed 2 fA input bias current, −40°C to +85°C operating range, SOIC-8 package compatibility, and verified rail-to-rail output performance under 100 kΩ load at 5 V supply.
Technical Context
The LMC6042AIM/NOPB uses a direct-integrator output stage-bypassing conventional push-pull buffers-to achieve rail-to-rail swing while maintaining low output impedance and high open-loop gain (>300 V/mV). Its architecture avoids latch-up susceptibility and supports ground-referenced inputs with common-mode range extending to V− (0 V in single-supply mode).
Stability is ensured via feed-forward compensation, enabling reliable operation with capacitive loads up to 100 pF when using external pull-up resistors or RC feedback networks. Input guarding techniques are explicitly recommended in TI's application notes to preserve sub-5 fA leakage performance in PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 2 fA typical - enables >1 TΩ sensor interface impedance without significant DC error. |
| Supply Current per Amp | 10 μA typical - supports multi-year battery life in always-on monitoring systems. |
| Rail-to-Rail Output | Swings to within 12 mV of V+ and 40 mV of V− at 5 V supply - maximizes dynamic range in single-supply data acquisition. |
| Input Common-Mode Range | Includes ground (0 V) - allows direct interfacing with grounded sensors like pH electrodes and piezoelectric transducers. |
| Gain-Bandwidth Product | 100 kHz - sufficient for DC-coupled instrumentation, slow-scan sensors, and low-frequency filtering (e.g., <10 Hz ECG front-ends). |
| Input Offset Voltage | 1 mV typical - ensures ≤0.02% full-scale error in 5 V-range measurement circuits. |
| CMRR | 75 dB typical - rejects common-mode noise from shared power rails or noisy digital environments. |
Pinout & Package
LMC6042AIM/NOPB is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-012 variation AA, with 1.27 mm lead pitch, 3.90 mm body width, and 1.75 mm max height. Pin 1 is marked by a beveled corner or dot; device marking reads "LMC60 42AIM".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp A) | High-impedance node accepting differential signals; requires guarding for <5 fA leakage integrity. |
| 2 | Non-Inverting Input (Amp A) | Ground-referenced input capable of 0 V common-mode voltage; used in pH probe buffers and transducer references. |
| 3 | Output (Amp A) | Rail-to-rail sourcing/sinking output; drives 100 kΩ loads to within 12 mV of V+ and 40 mV of V− at 5 V. |
| 4 | V− (Ground) | Single-supply reference node; must be low-impedance and decoupled near device to minimize PSRR degradation. |
| 5 | Non-Inverting Input (Amp B) | Independent high-Z input for second channel; supports dual-sensor configurations (e.g., differential thermopile + reference). |
| 6 | Inverting Input (Amp B) | Configurable for feedback in instrumentation amp topologies; matched to Pin 1 for CMRR optimization. |
| 7 | Output (Amp B) | Second rail-to-rail output; enables dual-channel signal conditioning without external op-amps. |
| 8 | V+ | Positive supply rail (4.5–15 V); internal ESD protection rated to 500 V HBM; requires 0.1 μF ceramic bypass near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 2 fA typical enables femtoamp-level current measurement in electrometers and ion-selective electrode interfaces. |
| Rail-to-rail output with ground-swing capability | Eliminates need for external pull-down resistors in single-supply systems, reducing power and component count. |
| Input common-mode range includes V− (ground) | Supports true single-ended sensor connections (e.g., grounded thermocouples, pH electrodes) without level-shifting circuitry. |
| Stable with capacitive loads up to 100 pF | Enables direct driving of ADC input capacitors or long cables without oscillation when using TI-recommended pull-up resistor (≥10 μA sink). |
| Low 1/f noise and 83 nV/√Hz broadband noise | Maintains SNR >70 dB in 0.1–10 Hz bandwidths critical for precision analog front-ends in medical and environmental sensors. |
Applications
| Battery-Powered pH Probe Buffer | Photodiode Preamplifier |
|---|---|
Use Scenario: Continuous monitoring of acidic/alkaline solutions in portable water quality analyzers using glass electrode sensors with >1 GΩ output impedance. IC Role / Device Role / Timing Role: High-impedance unity-gain buffer isolating electrode from downstream circuitry while preserving millivolt-level Nernst potential accuracy. Use Value: 2 fA input bias current prevents >1 mV offset drift over 24 hours, ensuring ±0.01 pH resolution without recalibration. | Use Scenario: Converting weak photocurrents (100 fA–10 nA) from IR detectors in gas analyzers or flame sensors into measurable voltage signals. IC Role / Device Role / Timing Role: Transimpedance amplifier with guarded input and ultra-low IB to maximize signal-to-noise ratio in low-light conditions. Use Value: Sub-5 fA leakage preserves >95% of photocurrent signal integrity, enabling detection of 0.1% gas concentration changes. |
| Silicon Transducer Signal Conditioning | Fire/Smoke Detection Charge Amplifier |
Use Scenario: Amplifying mV-level outputs from MEMS pressure or humidity sensors in HVAC control modules powered by coin-cell batteries. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end providing gain and common-mode rejection with <20 μA total quiescent current. Use Value: 10 μA/amp supply current extends 10-year battery life while maintaining 0.1% FS accuracy across −40°C to +85°C. | Use Scenario: Integrating charge pulses from ionization chamber smoke sensors in residential alarm systems operating on 9 V alkaline batteries. IC Role / Device Role / Timing Role: Low-drift charge amplifier converting pico-coulomb charge packets into stable voltage steps for comparator triggering. Use Value: 1 mV typical VOS and 1.3 μV/°C drift ensure consistent alarm thresholds across temperature, eliminating false positives. |
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, lower-grade temperature rating (−40°C to +85°C same, but LMC6042IM has wider parametric spread: e.g., 3 mV max VOS vs. 1 mV for AI grade) | Suitable for cost-sensitive industrial controls where 0.05% accuracy is acceptable | Select LMC6042IM/NOPB only if budget constraints outweigh need for guaranteed 1 mV VOS and 2 fA IB. |
| LTC1050CS8#PBF | Zero-drift auto-zero architecture; 50 nV VOS, 0.1 μV/°C drift, but 125 μA supply current - 12× higher than LMC6042AIM/NOPB | Better DC precision but incompatible with multi-year battery life requirements | Choose LTC1050 only when microvolt-level offset stability is mandatory and power budget allows ≥100 μA per channel. |
Compared with LMC6042IM/NOPB, the LMC6042AIM/NOPB guarantees tighter input offset voltage and lower input bias current for high-accuracy, ultra-low-power applications; versus LTC1050CS8#PBF, it trades absolute DC precision for 12× lower supply current - making it optimal for energy-constrained sensor nodes where battery longevity is prioritized over sub-100 nV offset.
Availability
LMC6042AIM/NOPB is available at Aetrix Electronics and suitable for battery monitoring, photodiode preamplification, and silicon transducer signal conditioning requiring stable component supply across industrial, medical, and environmental sensing programs.
Supply support for LMC6042AIM/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 is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in precision analog ICs.
The LMC6042AIM/NOPB belongs to TI's LMC604x micropower op-amp family, designed specifically for ultra-low-power, high-input-impedance sensor interfaces in portable and remote instrumentation systems.
FAQ
What is the maximum operating supply voltage for the LMC6042AIM/NOPB?
The LMC6042AIM/NOPB has an absolute maximum supply voltage of 16 V, but its recommended operating range is 4.5 V to 15.5 V. Operation above 15.5 V risks exceeding junction temperature limits or degrading long-term reliability, especially under continuous output short-circuit conditions. The LMC6042AIM/NOPB datasheet specifies 15 V as the upper limit for guaranteed electrical performance across temperature.
Does the LMC6042AIM/NOPB support true rail-to-rail input common-mode range?
No - the LMC6042AIM/NOPB supports rail-to-rail *output* swing and an input common-mode range that *includes ground*, but not the positive rail. Its input common-mode voltage range is specified as −0.1 V to V+ − 2.3 V (min) at room temperature, meaning it cannot accept inputs within ~2.3 V of V+. This limitation is inherent to its CMOS input stage design and is clearly documented in the Electrical Characteristics table of the LMC6042AIM/NOPB datasheet.
Can the LMC6042AIM/NOPB drive capacitive loads directly without external compensation?
The LMC6042AIM/NOPB can drive up to 100 pF capacitive loads reliably when using TI-recommended external components - specifically a pull-up resistor to V+ conducting ≥10 μA. Driving larger capacitances (e.g., >1 nF ADC inputs) without compensation causes phase-margin loss and potential oscillation. The LMC6042AIM/NOPB application note Figure 30 shows the exact RC network required for stable 1 nF loading, confirming that direct drive is not supported beyond 100 pF.
What is the guaranteed input bias current specification for LMC6042AIM/NOPB over temperature?
The LMC6042AIM/NOPB guarantees a maximum input bias current of 4 pA over the full −40°C to +85°C operating range, with 2 fA typical at 25°C. This is explicitly stated in the Electrical Characteristics table under "IB Input Bias Current" for the LMC6042AI grade. The 4 pA limit ensures predictable leakage behavior in high-impedance sensor interfaces across industrial temperature extremes - a key differentiator from standard CMOS op-amps.
Is the LMC6042AIM/NOPB RoHS compliant and lead-free?
Yes - the LMC6042AIM/NOPB is RoHS compliant and lead-free, as confirmed in TI's PACKAGE OPTION ADDENDUM. Its eco plan is listed as "Green (RoHS & no Sb/Br)", with lead/ball finish "SN" (matte tin), and MSL Level-1 rating. The "NOPB" suffix explicitly denotes lead-free packaging, and TI certifies compliance with EU RoHS Directive 2011/65/EU for all homogeneous materials.
LMC6042AIM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC6042AIM/NOPB FAQ
1.How can I place an order for LMC6042AIM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6042AIM/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 LMC6042AIM/NOPB reliable?
The price and inventory of LMC6042AIM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6042AIM/NOPB is usually 5 days.
3.What payment methods are accepted for LMC6042AIM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6042AIM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6042AIM/NOPB?
LMC6042AIM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6042AIM/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 LMC6042AIM/NOPB?
For technical support, including LMC6042AIM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6042AIM/NOPB requirements.
6.How does Aetrix verify that LMC6042AIM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC6042AIM/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 LMC6042AIM/NOPB meets industry standards.
7.What is the process for return or replacement of LMC6042AIM/NOPB?
All LMC6042AIM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC6042AIM/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 LMC6042AIM/NOPB part is unused and in its original packaging.
Return procedure for LMC6042AIM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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