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Texas Instruments LMC6442AIM/NOPB
- Part No.:
- LMC6442AIM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6442AIM/NOPB.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:724
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Product details
Overview
LMC6442AIM/NOPB from Texas Instruments is a dual micropower rail-to-rail output operational amplifier optimized for single-supply battery-powered systems. It delivers 0.95 µA/amplifier supply current, 9.5 kHz gain-bandwidth product, and output swing within 30 mV of both rails at 2.2 V supply-enabling precision signal conditioning in smoke detectors and portable instrumentation.
For engineers reviewing the LMC6442AIM/NOPB datasheet, LMC6442AIM/NOPB pinout, LMC6442AIM/NOPB application, or LMC6442AIM/NOPB equivalent, key selection criteria include ultra-low quiescent current, guaranteed operation down to 1.8 V, rail-to-rail output capability, input common-mode range extending to −0.3 V, and stability at closed-loop gains ≥+2 or ≤−1.
Technical Context
The LMC6442AIM/NOPB employs CMOS input stage architecture with 5 fA typical input bias current and operates across 1.8 V to 11 V supply range. Its rail-to-rail output stage uses complementary MOSFETs to achieve 22 mV maximum dropout from V− and 20–60 mV from V+ depending on load and supply voltage.
Designed for closed-loop gains ≥+2 (or ≤−1), it achieves 63°–68° phase margin and supports unity-gain operation only with external RC compensation. Input common-mode range spans −0.3 V to (V+ − 0.9 V), enabling ground-sensing configurations in single-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 0.95 µA per amplifier - enables >10-year battery life in low-duty-cycle CO detectors. |
| Output Swing | Within 22 mV of V− and 20 mV of V+ at 5 V - preserves dynamic range near supply rails. |
| Gain-Bandwidth Product | 9.5 kHz at 2.2 V - supports DC-coupled sensor amplification up to ~4 kHz bandwidth. |
| Input Bias Current | 5 fA typical - minimizes voltage error in high-impedance pH or gas sensor interfaces. |
| Input Common-Mode Range | −0.3 V to (V+ − 0.9 V) - allows direct ground-referenced input in single-supply thermostats. |
| Large-Signal Voltage Gain | 103 dB at 2.2 V - ensures <10 µV output error for 1 V input signals in precision instrumentation. |
| Operating Supply Range | 1.8 V to 11 V - compatible with single Li-ion (2.7–4.2 V), two alkaline (2.0–3.2 V), or regulated 5 V rails. |
Pinout & Package
LMC6442AIM/NOPB is housed in an 8-pin SOIC (D0008A) package with 1.27 mm pitch, 3.9 mm width, and 1.75 mm max height. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amplifier A) | High-impedance node accepting differential input; supports T-network feedback for high-Z sensor interfaces. |
| 2 | Non-Inverting Input (Amplifier A) | Accepts ground-referenced or biased sensor signals; common-mode range includes V−. |
| 3 | Output (Amplifier A) | Rail-to-rail capable output driving loads up to 300 pF with external compensation. |
| 4 | V− (Ground/Return) | Reference node for single-supply operation; input common-mode extends to this pin. |
| 5 | Non-Inverting Input (Amplifier B) | Independent second channel input; identical specs to Channel A for dual-sensor applications. |
| 6 | Inverting Input (Amplifier B) | Second channel inverting input; supports independent gain-setting resistors per channel. |
| 7 | Output (Amplifier B) | Second rail-to-rail output; usable for dual-channel signal conditioning or active filtering. |
| 8 | V+ | Positive supply rail; operates from 1.8 V to 11 V; supply current remains stable across range. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 0.95 µA/amplifier at 2.2 V - reduces average current draw below 2 µA for dual-channel battery monitoring. |
| Rail-to-Rail Output | Swing within 22 mV of V− and 20 mV of V+ at 5 V - maximizes ADC input range without level-shifting. |
| Wide Input Common-Mode Range | Extends to −0.3 V - enables direct connection of grounded thermistor or bridge sensors. |
| Low Input Bias Current | 5 fA typical - prevents significant offset in >100 MΩ source impedance applications like ion-selective electrodes. |
| Stable at Gains ≥+2 | 63°–68° phase margin - eliminates need for external compensation in most gain ≥+2 configurations. |
| Capacitive Load Drive | Supports up to 300 pF with RC compensation - accommodates long PCB traces or EMI filter capacitors. |
Applications
| Smoke/Gas Detectors | Portable Instrumentation |
|---|---|
Use Scenario: Amplifying low-level current from electrochemical CO or NO₂ sensors in battery-powered residential alarms. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier converting pA-level sensor currents to measurable voltage outputs. Use Value: 5 fA input bias current prevents sensor loading; 0.95 µA supply current extends 10-year battery life. |
Use Scenario: Signal conditioning for handheld multimeters or environmental data loggers using thermistors and RTDs. IC Role / Device Role / Timing Role: Precision dual op-amp providing gain, offset correction, and rail-to-rail buffering before ADC sampling. Use Value: 103 dB open-loop gain ensures <10 µV error; rail-to-rail output fully utilizes 12-bit ADC reference range. |
| Thermostats | Occupancy Sensors |
Use Scenario: Conditioning analog outputs from NTC thermistors in HVAC wall thermostats powered by two AA batteries. IC Role / Device Role / Timing Role: Ground-sensing non-inverting amplifier with V− referenced input and rail-to-rail output. Use Value: −0.3 V input common-mode range allows direct thermistor-to-ground connection; 1.8 V min supply supports end-of-life battery operation. |
Use Scenario: Amplifying weak pyroelectric (PIR) sensor outputs in low-power smart building motion detectors. IC Role / Device Role / Timing Role: Dual-channel AC-coupled amplifier with high input impedance and low noise for microvolt-level signals. Use Value: 170 nV/√Hz input voltage noise preserves SNR; 0.95 µA quiescent current enables multi-year coin-cell operation. |
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 |
|---|---|---|---|
| TLV2462IDR | Higher supply current (22 µA/amplifier); wider GBWP (6.4 MHz); rail-to-rail input/output. | Better for higher-speed sensor interfaces but unsuitable for >5-year battery life requirements. | Select TLV2462IDR only when bandwidth >100 kHz is required and power budget permits 23× higher quiescent current. |
| LPV521MG/NOPB | Lower supply current (322 nA/amplifier); lower GBWP (6.2 kHz); rail-to-rail input/output. | Superior battery life but insufficient gain-bandwidth for 100 Hz–1 kHz sensor signal chains. | Choose LPV521MG/NOPB for ultra-long-life applications with DC or sub-10 Hz signals; avoid for active filters or AC-coupled PIR amps. |
Compared with TLV2462IDR and LPV521MG/NOPB, the LMC6442AIM/NOPB uniquely balances sub-1 µA quiescent current with 9.5 kHz GBWP and guaranteed rail-to-rail output-making it optimal for mid-bandwidth, multi-year battery applications like smoke detectors and portable meters where both precision and longevity are critical.
Availability
LMC6442AIM/NOPB is available at Aetrix Electronics and suitable for smoke/gas detectors, portable instrumentation, thermostats, and occupancy sensors requiring stable component supply across extended production lifecycles.
Supply support for LMC6442AIM/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 founded in 1930, specializing in analog and embedded processing technologies with over 80,000 products serving industrial, automotive, and consumer markets.
The LMC6442AIM/NOPB belongs to TI's precision micropower op-amp family, engineered specifically for ultra-low-power, single-supply sensing applications where battery life and rail-to-rail performance are primary design constraints.
FAQ
What is the minimum operating supply voltage for LMC6442AIM/NOPB?
The LMC6442AIM/NOPB is specified to operate down to 1.8 V per the Absolute Maximum Ratings and Operating Ratings tables. At 1.8 V, it maintains rail-to-rail output swing and 0.95 µA/amplifier supply current, making it suitable for deeply discharged alkaline or NiMH battery systems. Performance parameters such as gain-bandwidth and output drive are characterized at 2.2 V, 5 V, and 10 V, but functional operation is ensured from 1.8 V.
Does LMC6442AIM/NOPB support true rail-to-rail input?
No, the LMC6442AIM/NOPB features rail-to-rail *output* but not rail-to-rail input. Its input common-mode voltage range extends from −0.3 V to (V+ − 0.9 V), meaning it accepts inputs down to 0.3 V below ground but cannot swing fully to V+. This design enables ground-sensing capability in single-supply systems while maintaining CMOS input stage integrity. For full rail-to-rail input, consider TI's TLV2462 or OPA333 families.
Can LMC6442AIM/NOPB drive capacitive loads without oscillation?
The LMC6442AIM/NOPB is stable driving up to 300 pF *only when external RC compensation is added*, as detailed in Figure 35 of the datasheet. Without compensation, it is optimized for gains ≥+2 and may exhibit overshoot or ringing with >100 pF loads. The recommended compensation network (CC and RC) isolates the op-amp output from capacitance, preserving phase margin. This is essential for driving long traces, EMI filters, or ADC input capacitors.
What is the input bias current specification for LMC6442AIM/NOPB?
The LMC6442AIM/NOPB has a typical input bias current of 5 fA at 25°C, with a maximum of 4 pA across temperature. This ultra-low value results from its CMOS input stage and enables accurate amplification of signals from high-impedance sources such as electrochemical gas sensors, pH electrodes, or photodiode transimpedance circuits where bias current-induced offset would otherwise dominate error budgets.
Is LMC6442AIM/NOPB suitable for unity-gain buffer applications?
The LMC6442AIM/NOPB is not internally compensated for unity-gain stability and requires external RC compensation (as shown in Figure 35) to operate reliably as a buffer. While possible, this adds components and board area. For native unity-gain stable operation, TI recommends alternatives like the LPV521 or OPA333. Use LMC6442AIM/NOPB in unity-gain only when its 0.95 µA supply current outweighs the cost and complexity of added compensation.
LMC6442AIM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMC®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.0041V/µs
- Gain Bandwidth Product:
- 10.5 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.005 pA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 1.9µA (x2 Channels)
- Current - Output / Channel:
- 2.1 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 11 V
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC6442AIM/NOPB FAQ
1.How can I place an order for LMC6442AIM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6442AIM/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 LMC6442AIM/NOPB reliable?
The price and inventory of LMC6442AIM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6442AIM/NOPB is usually 5 days.
3.What payment methods are accepted for LMC6442AIM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6442AIM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6442AIM/NOPB?
LMC6442AIM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6442AIM/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 LMC6442AIM/NOPB?
For technical support, including LMC6442AIM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6442AIM/NOPB requirements.
6.How does Aetrix verify that LMC6442AIM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC6442AIM/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 LMC6442AIM/NOPB meets industry standards.
7.What is the process for return or replacement of LMC6442AIM/NOPB?
All LMC6442AIM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC6442AIM/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 LMC6442AIM/NOPB part is unused and in its original packaging.
Return procedure for LMC6442AIM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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