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Texas Instruments LMC6042IM/NOPB
- Part No.:
- LMC6042IM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6042IM/NOPB.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,041
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Product details
Overview
LMC6042IM/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 use in battery-powered pH probe buffers and photodiode preamplifiers.
For engineers reviewing the LMC6042IM/NOPB datasheet, LMC6042IM/NOPB pinout, LMC6042IM/NOPB application, or LMC6042IM/NOPB equivalent, key selection criteria include verified 2 fA input leakage, guaranteed −40°C to +85°C operation, SOIC-8 packaging with SN lead finish, and confirmed compatibility with single-supply instrumentation amplifier topologies requiring ground-referenced input common-mode range.
Technical Context
The LMC6042IM/NOPB employs 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 at 100 kΩ load). Its internal feed-forward compensation ensures stability across wide capacitive load and supply voltage ranges (4.5V–15V).
This architecture enables reliable operation in high-impedance sensor interfaces: input common-mode range includes ground (−0.1 V min at V+ = 5V), CMRR exceeds 62 dB over 0–12 V common-mode range, and phase margin remains ≥60° with 100 pF load-critical for photodiode and piezoelectric charge amplifier designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 2 fA typical - enables >1 TΩ effective source impedance without significant DC error in pH probes or electrometers. |
| Supply Current per Amplifier | 10 μA typical - supports multi-year battery life in handheld analyzers and smoke detectors. |
| Rail-to-Rail Output Swing | 0.004 V above V− and 0.010 V below V+ at V+ = 5V/100 kΩ - preserves full dynamic range when interfacing to low-voltage ADCs. |
| Input Common-Mode Range | Includes ground (−0.1 V min) - allows direct sensing of 0 V-referenced transducers without level-shifting circuitry. |
| Gain-Bandwidth Product | 100 kHz - sufficient for DC–10 kHz sensor signal conditioning (e.g., thermopile, IR detector, piezoelectric transducer). |
| CMRR | 62 dB minimum (0–12 V VCM) - rejects power supply ripple and shared-noise coupling in single-supply systems. |
| Slew Rate | 0.010 V/μs minimum - adequate for <100 Hz precision measurement, not intended for fast pulse amplification. |
Pinout & Package
LMC6042IM/NOPB is housed in an 8-pin SOIC package (Package Drawing D, 3.91 mm × 4.90 mm × 1.75 mm max height) with SN (matte tin) lead finish, RoHS-compliant, and JEDEC MS-012 AA compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amplifier A) | High-impedance node accepting differential signal; requires guarding for sub-pA leakage control. |
| 2 | Non-Inverting Input (Amplifier A) | Ground-referenced input support enables direct connection to 0 V sensors (e.g., pH electrode reference). |
| 3 | Output (Amplifier A) | Rail-to-rail capable: swings within 10 mV of V+ and V− under 100 kΩ load - eliminates need for external pull-down resistors. |
| 4 | V− (Ground / Negative Supply) | Single-supply reference node; input common-mode extends to this pin - critical for true ground-sensing applications. |
| 5 | Non-Inverting Input (Amplifier B) | Independent second channel for dual-path signal conditioning (e.g., reference + signal channels in instrumentation amps). |
| 6 | Inverting Input (Amplifier B) | Matched to Pin 1; supports matched resistor networks in two-op-amp IA configurations per Figure 38. |
| 7 | Output (Amplifier B) | Identical rail-to-rail performance to Pin 3 - enables dual-channel low-power monitoring (e.g., battery voltage + temperature). |
| 8 | V+ (Positive Supply) | Accepts 4.5–15.5 V; thermal derating required above 85°C ambient due to θJA = 165°C/W (SOIC). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 2 fA typical - preserves signal integrity in femtoamp-level photodiode and electrochemical sensor circuits. |
| Single-supply rail-to-rail output | Swings to within 10 mV of V+ and V− - maximizes ADC utilization without level-shifting or charge-pump circuitry. |
| Ground-inclusive input common-mode range | Valid down to −0.1 V at V+ = 5V - enables direct interface to grounded transducers (e.g., silicon pressure sensors, pH electrodes). |
| Low quiescent power | 20 μA total for both amplifiers - supports always-on monitoring in fire/smoke detection systems with coin-cell batteries. |
| Stable with capacitive loads | Maintains ≥60° phase margin up to 100 pF - simplifies layout for long traces to remote sensors without added isolation components. |
Applications
| Battery Monitoring and Power Conditioning | Photodiode and Infrared Detector Preamplifier |
|---|---|
Use Scenario: Continuous voltage/current monitoring of Li-ion or alkaline battery packs in portable medical devices. IC Role / Device Role / Timing Role: Dual-channel buffer and difference amplifier - one channel monitors cell voltage, the other senses shunt voltage for current calculation. Use Value: 2 fA input leakage prevents self-discharge errors; rail-to-rail output ensures full-scale ADC mapping across 0–4.2 V range. |
Use Scenario: Low-noise amplification of weak photocurrents from PIN photodiodes in gas analyzers or IR flame detectors. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) front-end - converts sub-nA photocurrent to measurable voltage with minimal added noise. Use Value: 83 nV/√Hz input voltage noise and 0.0002 pA/√Hz current noise preserve signal-to-noise ratio; guarded input layout minimizes stray capacitance impact. |
| Silicon Based Transducer Systems | pH Probe Buffer Amplifier |
Use Scenario: Signal conditioning for piezoresistive pressure sensors in industrial process controllers or wearable health monitors. IC Role / Device Role / Timing Role: Instrumentation amplifier input stage - provides high-Z buffering and common-mode rejection for Wheatstone bridge outputs. Use Value: Input common-mode range including ground allows direct bridge excitation from single supply; 62 dB CMRR suppresses supply-induced bridge imbalance. |
Use Scenario: High-impedance buffer for glass-electrode pH sensors (100 MΩ–1 GΩ output impedance) in lab-grade analyzers. IC Role / Device Role / Timing Role: Unity-gain voltage follower - isolates fragile electrode from loading effects of downstream circuitry. Use Value: 2 fA input bias current avoids electrode polarization drift; rail-to-rail output accommodates full ±400 mV pH range without clipping. |
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 | Higher supply current (60 μA/amp), lower input bias current (0.01 fA), chopper-stabilized architecture. | Better DC accuracy for <1 Hz applications; higher noise floor (20 μVpp) limits bandwidth-sensitive uses. | Select when ultra-low offset drift (<0.05 μV/°C) outweighs power budget constraints. |
| TLV2462IDR | Higher supply current (550 μA/amp), rail-to-rail I/O, 1.5 pA input bias current. | Faster response (600 kHz GBW) but unsuitable for multi-year battery life; lacks ground-inclusive input range. | Choose for higher-speed sensor interfaces where 2 fA leakage is not mandatory and supply >5 V is available. |
Compared with LTC1050CS8#PBF and TLV2462IDR, LMC6042IM/NOPB uniquely balances femtoamp input leakage, single-digit μA power, and ground-referenced input capability - making it irreplaceable in long-life, high-impedance, single-supply systems like handheld pH meters and battery-powered smoke detectors.
Availability
LMC6042IM/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, environmental sensing, and portable medical diagnostics requiring stable component supply across extended product lifecycles.
Supply support for LMC6042IM/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 decades of expertise in precision analog IC design.
The LMC6042IM/NOPB belongs to TI's LMC604x micropower op-amp family, engineered specifically for ultra-low-leakage, single-supply sensor signal conditioning in portable and energy-constrained systems.
FAQ
What is the maximum operating supply voltage for LMC6042IM/NOPB?
The LMC6042IM/NOPB has an absolute maximum supply voltage rating of 16 V, but its recommended operating range is 4.5 V to 15.5 V. Operation at 15.5 V is validated per Electrical Characteristics tables, with output swing and supply current specifications fully characterized up to that level. Exceeding 16 V risks permanent damage.
Does LMC6042IM/NOPB support true rail-to-rail input?
No, LMC6042IM/NOPB does not feature rail-to-rail input. Its input common-mode voltage range extends to ground (−0.1 V minimum at V+ = 5 V) but stops short of V+ by approximately 2.3 V (e.g., up to V+ − 2.3 V at room temperature). This ground-inclusive range is sufficient for most single-supply sensor interfaces, but inputs must remain below V+ − 2.3 V.
Can LMC6042IM/NOPB drive capacitive loads directly?
LMC6042IM/NOPB maintains ≥60° phase margin with up to 100 pF capacitive load, as verified in Typical Performance Characteristics (Figure 27–28). For larger loads (>100 pF), external compensation is required - such as adding a series resistor (e.g., 10–100 Ω) between output and load, or using the pull-up resistor technique shown in Figure 31 to improve settling behavior.
What is the guaranteed temperature range for LMC6042IM/NOPB?
The LMC6042IM/NOPB is specified for operation from −40°C to +85°C junction temperature. This industrial-grade range is confirmed in the Operating Ratings table and applies to all electrical characteristics unless otherwise noted. The "I" suffix denotes this temperature grade, distinct from the "AI" variant rated to +125°C.
Is LMC6042IM/NOPB pin-compatible with other dual op-amps in SOIC-8?
LMC6042IM/NOPB follows the standard dual op-amp SOIC-8 pinout (Pin 1: A−, Pin 2: A+, Pin 3: AOUT, Pin 4: V−, Pin 5: B+, Pin 6: B−, Pin 7: BOUT, Pin 8: V+), matching industry conventions used by TLV2462, MCP6022, and LM358. However, functional equivalence (e.g., input bias current, rail-to-rail capability) is not guaranteed - direct substitution requires validation of leakage, supply current, and output swing requirements.
LMC6042IM/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
LMC6042IM/NOPB FAQ
1.How can I place an order for LMC6042IM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6042IM/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 LMC6042IM/NOPB reliable?
The price and inventory of LMC6042IM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6042IM/NOPB is usually 5 days.
3.What payment methods are accepted for LMC6042IM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6042IM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6042IM/NOPB?
LMC6042IM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6042IM/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 LMC6042IM/NOPB?
For technical support, including LMC6042IM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6042IM/NOPB requirements.
6.How does Aetrix verify that LMC6042IM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC6042IM/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 LMC6042IM/NOPB meets industry standards.
7.What is the process for return or replacement of LMC6042IM/NOPB?
All LMC6042IM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC6042IM/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 LMC6042IM/NOPB part is unused and in its original packaging.
Return procedure for LMC6042IM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMC6042IM/NOPB Tags
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