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Texas Instruments LMC6042IMX/NOPB
- Part No.:
- LMC6042IMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6042IMX/NOPB.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,438
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Product details
Overview
LMC6042IMX/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 both V+ and ground), and operates from 4.5V to 15V single supply - enabling precision pH probe buffering and battery-powered transducer interfaces.
For engineers reviewing the LMC6042IMX/NOPB datasheet, LMC6042IMX/NOPB pinout, LMC6042IMX/NOPB application, or LMC6042IMX/NOPB equivalent, key selection criteria include verified 2 fA input leakage, guaranteed −40°C to +85°C operation, SOIC-8 packaging with RoHS-compliant lead finish, and confirmed compatibility with photodiode preamplifier and silicon transducer front-end topologies.
Technical Context
The LMC6042IMX/NOPB uses TI's Double-Poly Silicon-Gate CMOS process to achieve sub-picoampere input bias current and rail-to-rail output drive without external pull-downs. Its input common-mode range includes ground, and its output stage connects directly to the internal integrator - eliminating traditional push-pull buffers while maintaining stability across capacitive loads up to 100 pF when properly compensated.
This architecture enables true zero-in/zero-out behavior in single-supply instrumentation amplifiers and supports low-leakage guarding techniques critical for <100 pA system-level accuracy. The device exhibits 75 dB minimum CMRR at 25°C and maintains ≥60° phase margin with 100 kHz gain-bandwidth product - suitable for DC-coupled sensor interfaces requiring long-term drift stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 2 fA typical - enables >1 TΩ effective input impedance for photodiode and pH electrode interfaces |
| Supply Current per Amp | 10 μA typical - supports multi-year battery life in handheld analyzers and smoke detectors |
| Rail-to-Rail Output Swing | Swings to within 13 mV of V− and 30 mV of V+ at 100 kΩ load - eliminates need for negative supply in single-rail systems |
| Input Common-Mode Range | Includes ground (−0.1 V min) and extends to V+−2.3 V - allows direct sensing of 0 V referenced sensors |
| Gain-Bandwidth Product | 100 kHz - sufficient for DC–10 Hz transducer signal conditioning with >60° phase margin |
| CMRR | 62 dB minimum (−40°C to +85°C) - ensures stable rejection of supply noise in battery-monitoring circuits |
| Operating Temperature | −40°C to +85°C - qualified for industrial embedded and portable medical instrument use |
Pinout & Package
LMC6042IMX/NOPB is housed in an 8-pin SOIC (D package), 3.91 mm × 4.90 mm body, 1.75 mm max height, RoHS-compliant matte tin (Sn) lead finish, JEDEC MS-012 AA compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp A) | High-impedance node requiring guard ring layout to preserve 2 fA leakage spec |
| 2 | Non-Inverting Input (Amp A) | Accepts signals down to ground; enables single-supply transducer biasing |
| 3 | Output (Amp A) | Rail-to-rail capable; drives 100 kΩ load to within 13 mV of V− and 30 mV of V+ |
| 4 | V− (Ground for single supply) | Reference for both amplifiers; must be low-impedance to maintain CMRR |
| 5 | Non-Inverting Input (Amp B) | Independent high-Z input; usable for differential sensing or reference buffering |
| 6 | Inverting Input (Amp B) | Matches Pin 1 performance; supports dual-channel guarded layouts |
| 7 | Output (Amp B) | Electrically isolated from Amp A output; supports independent signal paths |
| 8 | V+ | Single 4.5–15 V supply rail; powers both amplifiers; requires local 0.1 μF bypass |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 2 fA typical enables femtoampere-level current measurement in electrometers and ion-selective electrodes |
| Rail-to-rail output with ground swing | Eliminates need for negative supply or pull-down resistors in battery-powered pH and gas sensors |
| Input common-mode range including ground | Supports direct interfacing to grounded transducers (e.g., silicon pressure sensors, thermopiles) |
| Stable driving of capacitive loads | Maintains ≥60° phase margin with ≤100 pF load when using recommended compensation (RPULLUP ≥100 kΩ) |
| Low quiescent power | 20 μA total for both amps extends battery life in handheld instruments beyond 5 years at 10 μA avg draw |
Applications
| Battery Monitoring and Power Conditioning | Photodiode and Infrared Detector Preamplifier |
|---|---|
Use Scenario: Monitoring voltage and current in lithium coin-cell powered IoT nodes with 10-year lifetime targets. IC Role / Device Role / Timing Role: Dual op-amp configured as precision current-sense amplifier and rail-splitter for ADC reference. Use Value: 2 fA input leakage prevents self-discharge errors; 10 μA/amp supply current minimizes system standby drain. | Use Scenario: Amplifying weak photocurrents (<100 pA) from IR flame detectors in fire alarm systems. IC Role / Device Role / Timing Role: Transimpedance amplifier with guarded input and feedback capacitor compensation. Use Value: Verified 2 fA bias current preserves signal integrity; rail-to-rail output maximizes dynamic range into 12-bit SAR ADC. |
| Silicon Based Transducer Systems | pH Probe Buffer Amplifier |
Use Scenario: Signal conditioning for piezoresistive MEMS pressure sensors in portable medical devices. IC Role / Device Role / Timing Role: Low-drift, high-Z buffer isolating sensor bridge from noisy digital circuitry. Use Value: Input common-mode range including ground allows direct bridge excitation; 62 dB CMRR rejects supply ripple. | Use Scenario: High-impedance buffer for glass electrode pH probes in handheld water quality testers. IC Role / Device Role / Timing Role: Unity-gain follower with air-wired inputs to eliminate PCB surface leakage. Use Value: 2 fA input current avoids electrode polarization; rail-to-rail swing captures full ±414 mV pH range at 5 V supply. |
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 |
|---|---|---|---|
| LTC1050CS8#PBF | Chopper-stabilized; 50 nV/°C VOS drift vs. LMC6042IMX/NOPB's 1.3 μV/°C; higher 125 μA supply current | Better DC precision but unsuitable for ultra-low-power battery systems due to 12× higher current | Select only when offset drift dominates over power budget |
| MAX40006ASA+T | Zero-drift architecture; 0.5 pA input bias vs. 2 fA; 1.2 μA supply current; 1 MHz GBW | Higher speed and lower offset, but 120× higher input current degrades high-Z sensor accuracy | Prefer for AC-coupled, medium-speed applications where leakage is less critical than bandwidth |
Compared with LTC1050CS8#PBF and MAX40006ASA+T, the LMC6042IMX/NOPB uniquely balances femtoampere input leakage, micropower consumption, and rail-to-rail operation - making it irreplaceable in battery-powered, high-impedance DC measurement systems where leakage-induced error must stay below 0.1%.
Availability
LMC6042IMX/NOPB is available at Aetrix Electronics and suitable for battery monitoring, photodiode preamplification, and pH probe buffering requiring stable component supply across industrial, medical, and environmental instrumentation programs.
Supply support for LMC6042IMX/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 company specializing in analog and embedded processing technologies, with over 50 years of leadership in precision op-amps and low-power signal chains.
The LMC6042IMX/NOPB belongs to TI's LMC604x micropower op-amp family, designed specifically for ultra-low-leakage, single-supply sensor interface applications in portable and battery-constrained systems.
FAQ
What is the maximum operating supply voltage for LMC6042IMX/NOPB?
The LMC6042IMX/NOPB has an absolute maximum supply voltage rating of 16 V, with ensured operation from 4.5 V to 15.5 V. At 15 V supply, output swing remains within 150 mV of each rail under 25 kΩ load, and supply current increases to 56 μA max for both amplifiers - verified across −40°C to +85°C.
Does LMC6042IMX/NOPB support true rail-to-rail input common-mode range?
No - the LMC6042IMX/NOPB supports rail-to-rail *output* swing and an input common-mode range that *includes ground* (down to −0.1 V) and extends to V+−2.3 V. It does not accept inputs at V+; attempting to do so violates the absolute maximum rating and risks latch-up or parametric shift.
Can LMC6042IMX/NOPB drive capacitive loads directly?
LMC6042IMX/NOPB can drive ≤100 pF capacitive loads with stable step response when using TI-recommended compensation: a 100 kΩ pull-up resistor to V+ and proper PCB guarding. Direct connection to >100 pF loads without compensation causes overshoot and ringing due to phase margin reduction - confirmed in Figure 27 and Application Hints section.
What is the guaranteed input bias current specification for LMC6042IMX/NOPB over temperature?
The LMC6042IMX/NOPB guarantees input bias current ≤4 pA (max) over the full −40°C to +85°C operating range, with 2 fA typical at 25°C. This is validated per Electrical Characteristics table on page 2 of SNOS611E, and applies to both amplifiers independently under V+ = 5 V, V− = 0 V conditions.
Is LMC6042IMX/NOPB pin-compatible with other members of the LMC604x family?
Yes - LMC6042IMX/NOPB shares identical SOIC-8 pinout with LMC6042AIMX/NOPB, LMC6042IN/NOPB, and LMC6042AIM/NOPB. All variants use the same D package drawing, pin numbering, and functional assignment per Figure 1; only temperature grade (I vs AI) and packaging (tape/reel vs tube) differ - no PCB redesign required when substituting within the same package type.
LMC6042IMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC6042IMX/NOPB FAQ
1.How can I place an order for LMC6042IMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6042IMX/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 LMC6042IMX/NOPB reliable?
The price and inventory of LMC6042IMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6042IMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMC6042IMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6042IMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6042IMX/NOPB?
LMC6042IMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6042IMX/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 LMC6042IMX/NOPB?
For technical support, including LMC6042IMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6042IMX/NOPB requirements.
6.How does Aetrix verify that LMC6042IMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC6042IMX/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 LMC6042IMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMC6042IMX/NOPB?
All LMC6042IMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC6042IMX/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 LMC6042IMX/NOPB part is unused and in its original packaging.
Return procedure for LMC6042IMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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