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Texas Instruments LMC6042AIMX
- Part No.:
- LMC6042AIMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6042AIMX.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,240
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Product details
Overview
LMC6042AIMX from Texas Instruments is a CMOS dual micropower operational amplifier optimized for ultra-low-power, high-impedance signal conditioning. It delivers 10 μA/amp supply current (typ), 2 fA input bias current (typ), rail-to-rail output swing, and operation from 4.5 V to 15 V single supply - enabling use in battery-powered pH probe buffers and photodiode preamplifiers.
For engineers reviewing the LMC6042AIMX datasheet, LMC6042AIMX pinout, LMC6042AIMX application, or LMC6042AIMX equivalent, key selection criteria include verified 2 fA input leakage, guaranteed −40°C to +85°C operating range, SOIC-8 packaging with RoHS-compliant lead finish, and confirmed compatibility with single-supply instrumentation amplifier topologies requiring ground-referenced inputs.
Technical Context
The LMC6042AIMX employs a direct-integrator output stage instead of a conventional push-pull buffer, enabling rail-to-rail swing while maintaining low output impedance and high open-loop gain. Its internal feed-forward compensation ensures stability across wide load and supply conditions without external components.
This architecture supports true input common-mode range including ground (−0.1 V min at V+ = 5 V) and delivers 100 kHz gain-bandwidth product with 0.02 V/μs slew rate. Input-referred voltage noise is 83 nV/√Hz at 1 kHz, and current noise is 0.0002 pA/√Hz - critical for femtoamp-level transducer interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 20 μA per amplifier (typ) - enables multi-year battery life in portable analyzers |
| Input Bias Current | 2 fA (typ) - preserves signal integrity in high-Z sensor interfaces like pH electrodes |
| Rail-to-Rail Output | Swings within 13 mV of V− and 30 mV of V+ at V+ = 5 V - eliminates need for level-shifting in single-supply systems |
| Input Common-Mode Range | Includes ground (−0.1 V min) - allows direct connection of grounded transducers without bias networks |
| Gain-Bandwidth Product | 100 kHz - sufficient for DC–100 Hz biosignal and environmental sensing applications |
| CMRR | 75 dB (typ) at 0 V ≤ VCM ≤ 12.0 V - rejects power supply ripple and shared-noise coupling in compact layouts |
| Operating Temperature | −40°C to +85°C - qualified for industrial and portable medical instrument deployment |
Pinout & Package
LMC6042AIMX is housed in an 8-pin SOIC package (Package Drawing D), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, RoHS-compliant matte tin (SN) lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp A) | High-impedance node accepting signals down to femtoamp levels; requires guard ring layout |
| 2 | Non-Inverting Input (Amp A) | Ground-referenced input capability enables direct sensor connection without DC biasing |
| 3 | Output (Amp A) | Rail-to-rail sourcing/sinking up to ±16 mA - drives 100 kΩ loads to within 13 mV of rails |
| 4 | V− (GND) | Single-supply reference node; supports true ground-referenced input common-mode range |
| 5 | Non-Inverting Input (Amp B) | Independent high-Z input for dual-channel signal paths (e.g., differential transducer pairs) |
| 6 | Inverting Input (Amp B) | Matched input characteristics to Pin 1 - enables precision two-op-amp instrumentation amplifier designs |
| 7 | Output (Amp B) | Electrically isolated output stage; >115 dB amp-to-amp isolation prevents crosstalk in dual-sensor systems |
| 8 | V+ | 4.5 V to 15 V single-supply rail; thermal derating required above 85°C ambient due to θJA = 165°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input leakage | 2 fA typical bias current enables direct interfacing with silicon transducers and pH electrodes without guard-driven buffers |
| Rail-to-rail output stage | Direct integrator-based output delivers full dynamic range from ground to V+ - eliminates external pull-down resistors in battery systems |
| Ground-inclusive input range | Input common-mode extends to −0.1 V (V−) - supports grounded thermocouples, photodiodes, and charge amplifiers without level shifters |
| Stable capacitive load drive | Internal feed-forward compensation maintains ≥60° phase margin with ≥100 pF loads - simplifies sensor cable termination |
| Low-noise high-Z interface | 83 nV/√Hz voltage noise + 0.0002 pA/√Hz current noise optimizes SNR for photodiode and infrared detector preamplification |
Applications
| Battery-Powered pH Probe Buffer | Photodiode Preamplifier |
|---|---|
Use Scenario: Portable handheld pH meter measuring electrolyte potential via glass electrode with >1012 Ω source impedance. IC Role / Device Role / Timing Role: Voltage follower buffer isolating high-Z electrode from ADC input while preserving DC accuracy. Use Value: 2 fA input bias current prevents >1 mV offset drift over time; rail-to-rail output ensures full 0–5 V ADC range utilization. |
Use Scenario: Low-light detection in smoke sensor using reverse-biased silicon photodiode generating <100 pA photocurrent. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to measurable voltage with minimal dark-current error. Use Value: Femtoamp input leakage avoids signal corruption; 100 kHz GBW supports pulse-modulated IR LED detection at 1–10 kHz. |
| Silicon Transducer Signal Conditioning | Fire Detection Charge Amplifier |
Use Scenario: Pressure or humidity sensor with piezoresistive bridge output requiring low-drift, low-power amplification in HVAC controller. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end using dual LMC6042AIMX op-amps in two-op-amp topology. Use Value: Matched input specs enable >80 dB CMRR; 20 μA total quiescent current extends battery life beyond 5 years in maintenance-free installations. |
Use Scenario: Ionization chamber in residential fire alarm detecting minute charge pulses from alpha-particle ionization events. IC Role / Device Role / Timing Role: Charge amplifier integrating transient current pulses into measurable voltage steps for microcontroller sampling. Use Value: Ultra-high input resistance prevents charge leakage; rail-to-rail output captures full pulse amplitude without clipping at low supply voltages. |
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 |
|---|---|---|---|
| LMC6042IMX/NOPB | Same die, lower-grade temperature rating (−40°C to +85°C vs AI grade's same range; both rated identically per datasheet) | No functional difference in commercial/industrial environments; identical pinout, specs, and SOIC-8 packaging | Select LMC6042IMX/NOPB only if cost sensitivity outweighs TI's AI-grade traceability and extended test screening |
| LTC1050CS8#PBF | Zero-drift auto-zero architecture; 1.5 μV max VOS vs 6 mV for LMC6042AIMX; higher 125 μA supply current | Better DC precision for <1 mV offset-critical systems; unsuitable for multi-year battery life due to 6× higher current draw | Choose LTC1050CS8#PBF only when sub-microvolt offset stability is mandatory and power budget allows ≥120 μA per channel |
Compared with LMC6042IMX/NOPB, the LMC6042AIMX offers identical electrical performance but tighter manufacturing controls; compared with LTC1050CS8#PBF, it trades 10× lower supply current for higher input offset voltage - making it optimal for battery longevity over ultra-precision DC gain.
Availability
LMC6042AIMX is available at Aetrix Electronics and suitable for battery monitoring, photodiode preamplification, and silicon transducer signal conditioning requiring stable component supply across industrial and medical OEM programs.
Supply support for LMC6042AIMX 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 expertise in precision op-amp design and low-power signal chain solutions.
The LMC6042AIMX belongs to TI's micropower CMOS op-amp family engineered specifically for ultra-low-leakage, single-supply instrumentation - targeting portable analytical tools, environmental sensors, and safety-critical detection systems.
FAQ
What is the maximum supply voltage for the LMC6042AIMX?
The LMC6042AIMX has an absolute maximum supply voltage of 16 V, with recommended operating range from 4.5 V to 15.5 V. Operation above 15.5 V risks exceeding junction temperature limits or degrading long-term reliability, especially under load. The datasheet specifies 15 V as the upper limit for guaranteed performance across temperature.
Does the LMC6042AIMX support true rail-to-rail input common-mode range?
The LMC6042AIMX supports input common-mode voltage down to −0.1 V (below V−) and up to V+ − 2.3 V (at 25°C), meaning it includes ground in its usable range but does not extend fully to V+. This enables direct grounding of sensors while retaining >50 dB CMRR - a key distinction from full rail-to-rail input op-amps.
Can the LMC6042AIMX drive capacitive loads directly?
The LMC6042AIMX is stable with ≥100 pF capacitive loads when used in unity-gain follower configuration, per Figure 27 in the datasheet. For larger loads (>500 pF), external compensation (e.g., series resistor + feedback capacitor) or a pull-up resistor to V+ is required to maintain phase margin and prevent oscillation.
What is the guaranteed input bias current specification for LMC6042AIMX over temperature?
The LMC6042AIMX guarantees input bias current ≤4 pA (max) across the full −40°C to +85°C operating range, with typical value of 2 fA at 25°C. This specification is ensured per Electrical Characteristics table and applies to both amplifiers in the dual package - critical for long-term stability in high-impedance pH and ion-sensing circuits.
Is the LMC6042AIMX pin-compatible with other members of the LMC604x family?
Yes, the LMC6042AIMX is pin-compatible with all LMC604x dual variants (e.g., LMC6042IMX/NOPB) in SOIC-8 packaging. It shares identical pinout, footprint, and electrical interface with LMC6041 (single) and LMC6044 (quad) only in functional channel count - but those require different package types (SOIC-8 vs SOIC-14/SOIC-16) and are not mechanically interchangeable.
LMC6042AIMX 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
LMC6042AIMX FAQ
1.How can I place an order for LMC6042AIMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6042AIMX 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 LMC6042AIMX reliable?
The price and inventory of LMC6042AIMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6042AIMX is usually 5 days.
3.What payment methods are accepted for LMC6042AIMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6042AIMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6042AIMX?
LMC6042AIMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6042AIMX 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 LMC6042AIMX?
For technical support, including LMC6042AIMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6042AIMX requirements.
6.How does Aetrix verify that LMC6042AIMX is sourced from the original manufacturer or authorized distributors?
All LMC6042AIMX 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 LMC6042AIMX meets industry standards.
7.What is the process for return or replacement of LMC6042AIMX?
All LMC6042AIMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC6042AIMX, 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 LMC6042AIMX part is unused and in its original packaging.
Return procedure for LMC6042AIMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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