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Texas Instruments LMC6041AIN
- Part No.:
- LMC6041AIN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LMC6041AIN.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,329
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Product details
Overview
LMC6041AIN from Texas Instruments is a single-channel, micropower CMOS operational amplifier optimized for ultra-low-input-current, single-supply battery-powered systems. It delivers 2 fA typical input bias current, 10 µA supply current per amplifier, rail-to-rail output swing (to within 30 mV of rails at 100 kΩ load), and operates from 4.5 V to 15 V single supply. It serves as a precision front-end amplifier in pH-probe buffers and photodiode preamplifiers where leakage-sensitive signal integrity is critical.
For engineers reviewing the LMC6041AIN datasheet, LMC6041AIN pinout, LMC6041AIN application, or LMC6041AIN equivalent, this page provides verified specifications, SOIC-8 package layout guidance, real-world use cases in portable instrumentation and transducer interfaces, and validated alternative options for low-power analog signal conditioning.
Technical Context
The LMC6041AIN uses TI's double-poly silicon-gate CMOS process to achieve ultra-low input leakage while maintaining rail-to-rail output drive without external pulldown resistors. Its input common-mode range includes ground, enabling direct interfacing with grounded sensors like pH electrodes and piezoelectric charge sources.
It features internal compensation for stability across wide supply (4.5–15 V) and temperature (–40°C to +85°C) ranges, with 75 kHz gain-bandwidth product and 0.015 V/µs slew rate - sufficient for DC-critical, low-frequency sensor amplification but not high-speed signal processing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 14–20 µA at 5 V (typical quiescent draw enables >1-year battery life in coin-cell-powered pH meters) |
| Input Bias Current | ±2 fA typical (enables <1 µV error from 1 GΩ source impedance at 25°C) |
| Input Voltage Range | Includes ground (0 V) to (V+) – 2.3 V (supports direct connection to grounded transducers) |
| Output Swing | Rail-to-rail: 0.004–0.030 V above V– and 4.97–4.987 V below V+ at 5 V supply (preserves full dynamic range) |
| Gain-Bandwidth Product | 75 kHz (supports stable closed-loop gain up to ~75 at 1 kHz; suitable for DC–100 Hz sensor channels) |
| Open-Loop Gain | 300–1000 V/mV (ensures <0.1% gain error with 100× closed-loop gain into 100 kΩ load) |
| CMRR | 68–75 dB (maintains accuracy when rejecting common-mode noise from shared sensor grounds) |
Pinout & Package
LMC6041AIN is housed in an 8-pin SOIC (D package), 1.27 mm pitch, with exposed pad not present. Pin 1 and Pin 5 are no-connect (NC); unused pins must be left floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No connection | Must remain unconnected; no internal bond or function |
| Pin 2 (–IN) | Inverting input | Primary feedback node; sensitive to stray capacitance - requires guard ring layout |
| Pin 3 (+IN) | Noninverting input | High-impedance sensor interface point; leakage <2 fA enables direct photodiode coupling |
| Pin 4 (V–) | Negative supply | Ground reference in single-supply operation; connects to system GND |
| Pin 5 (NC) | No connection | Must remain unconnected; no internal bond or function |
| Pin 6 (OUT) | Amplifier output | Rail-to-rail capable; drives ≥100 kΩ load to within 30 mV of rails |
| Pin 7 (V+) | Positive supply | Accepts 4.5–15 V; powers internal CMOS circuitry and output stage |
| Pin 8 (NC) | No connection | Must remain unconnected; no internal bond or function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 2 fA typical enables accurate measurement from high-impedance sources (>1 TΩ) without significant voltage drop |
| Rail-to-rail output | Swings within 30 mV of both supply rails at 100 kΩ load, maximizing usable signal range in single-supply systems |
| Ground-referenced input | Input common-mode range includes 0 V, allowing direct interface with grounded sensors (e.g., pH probes, thermopiles) |
| Micropower operation | 14–20 µA supply current supports multi-year battery life in portable analyzers and smoke detectors |
| Latch-up immunity | CMOS process ensures robustness against supply sequencing errors and transient overvoltage on inputs |
Applications
| Battery-Powered pH Probe Buffer | Photodiode Preamp in Portable Analyzers |
|---|---|
Use Scenario: Signal conditioning for glass-electrode pH sensors in handheld water quality testers. IC Role / Device Role / Timing Role: High-impedance buffer amplifier isolating electrode (≥1 GΩ) from downstream ADC, with DC-coupled rail-to-rail output. Use Value: 2 fA input bias prevents electrode polarization drift; 10 µA quiescent current extends CR2032 battery life beyond 2 years. |
Use Scenario: Amplifying weak current from silicon photodiodes in field-deployable spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier converting pA-level photocurrent to measurable voltage with minimal dark-current error. Use Value: Input bias current <2 fA avoids offset error from diode shunt resistance; rail-to-rail output maximizes dynamic range at 3.3 V supply. |
| Piezoelectric Charge Amplifier | Fire/Smoke Detector Sensor Interface |
Use Scenario: Converting charge output from vibration-sensing piezoceramics in structural health monitors. IC Role / Device Role / Timing Role: Charge amplifier with ultra-high input impedance and low-noise integration capacitor biasing. Use Value: Input leakage <2 fA preserves charge integrity over seconds-long integration windows; CMOS process eliminates latch-up risk in harsh environments. |
Use Scenario: Signal conditioning for ionization chamber or optical smoke sensors in battery-backed residential alarms. IC Role / Device Role / Timing Role: Low-power comparator front-end or transducer amplifier operating continuously on AA cells. Use Value: 14 µA supply current enables >5-year standby life; input common-mode range including ground simplifies PCB layout near chassis GND. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L1CD | Higher input bias current (20 pA vs. 2 fA), lower GBW (85 kHz), same SOIC-8 package | Less suitable for >100 MΩ sensor sources; acceptable for general-purpose low-power buffering | Select if cost sensitivity outweighs ultra-low-leakage requirement and 100× higher input current is tolerable |
| OPA348AIDBVR | Higher supply current (45 µA), wider GBW (1 MHz), rail-to-rail I/O, same SOIC-8 footprint | Supports higher-frequency signals (e.g., pulse oximetry), but reduces battery life by ~3× | Select when faster response or dual-rail I/O is needed, and 2 fA input bias is not mandatory |
Compared with TLC27L1CD and OPA348AIDBVR, the LMC6041AIN uniquely balances femtoampere input leakage, micropower consumption, and rail-to-rail output in a legacy-compatible SOIC-8 package - making it irreplaceable in pH probe buffers and piezoelectric charge amplifiers where leakage-induced drift dominates error budgets.
Availability
LMC6041AIN is available at Aetrix Electronics and suitable for battery monitoring and power conditioning, photodiode and infrared-detector preamplifier, and pH-probe buffer amplifier applications requiring stable component supply and long-lifecycle support.
Supply support for LMC6041AIN 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 delivering analog and embedded processing solutions, with over 50 years of op-amp innovation and manufacturing excellence.
The LMC604x family was designed specifically for ultra-low-power, ultra-high-impedance sensor signal conditioning in portable and battery-critical instrumentation - prioritizing femtoampere input leakage, rail-to-rail output, and single-supply operation.
FAQ
What is the maximum supply voltage for LMC6041AIN?
The LMC6041AIN supports a maximum supply voltage of 16 V across V+ and V– terminals. Absolute maximum rating is 16 V; recommended operating range is 4.5 V to 15.5 V single supply. Exceeding 16 V risks permanent damage. The LMC6041AIN datasheet specifies thermal derating above 85°C ambient, and output short-circuit protection applies only up to 13 V on V+ to avoid reliability degradation.
Does LMC6041AIN support true rail-to-rail input?
No, the LMC6041AIN does not support rail-to-rail input. Its input common-mode voltage range extends from ground (V–) to (V+) – 2.3 V at room temperature - meaning the upper limit is 2.3 V below the positive rail. However, it does provide rail-to-rail output swing and includes ground in its input range, making it ideal for single-supply sensor interfaces where the signal stays near 0 V.
Can LMC6041AIN drive capacitive loads directly?
The LMC6041AIN has limited direct capacitive-load drive capability. Driving >100 pF directly may cause instability or ringing. TI recommends using a series resistor (e.g., 20–100 Ω) between output and load, or adding a pullup resistor to V+ (≥10 µA current) to improve phase margin. For >1 nF loads, indirect driving via a unity-gain buffer or RC isolation is advised per Section 6.1.3 of the LMC6041AIN datasheet.
What is the input impedance of LMC6041AIN?
The LMC6041AIN features an input resistance >10 TΩ (10¹³ Ω) due to its CMOS input stage. This value is derived from the specified 2 fA typical input bias current at 5 V common-mode voltage. At elevated temperatures (–40°C to +85°C), input bias current rises to ±4 pA, reducing effective DC input resistance to ~1 TΩ - still sufficient for most high-impedance sensor applications including pH electrodes and piezoelectric transducers.
Is LMC6041AIN pin-compatible with other LMC604x variants?
No, the LMC6041AIN (single-channel) is not pin-compatible with LMC6042 (dual) or LMC6044 (quad), despite sharing the same SOIC-8 or PDIP-8 footprints for the single/dual versions. Pin 1, 5, and 8 are NC on LMC6041AIN but carry active signals (e.g., OUT B, +IN B) on LMC6042. Swapping them without board redesign will result in functional failure. Always verify pin functions per Table 4-1 in the LMC6041AIN datasheet.
LMC6041AIN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.02V/µs
- Gain Bandwidth Product:
- 75 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.002 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 18µA
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LMC6041AIN FAQ
1.How can I place an order for LMC6041AIN through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6041AIN 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 LMC6041AIN reliable?
The price and inventory of LMC6041AIN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6041AIN is usually 5 days.
3.What payment methods are accepted for LMC6041AIN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6041AIN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6041AIN?
LMC6041AIN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6041AIN 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 LMC6041AIN?
For technical support, including LMC6041AIN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6041AIN requirements.
6.How does Aetrix verify that LMC6041AIN is sourced from the original manufacturer or authorized distributors?
All LMC6041AIN 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 LMC6041AIN meets industry standards.
7.What is the process for return or replacement of LMC6041AIN?
All LMC6041AIN units undergo pre-shipment inspection (PSI). If there is an issue with LMC6041AIN, 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 LMC6041AIN part is unused and in its original packaging.
Return procedure for LMC6041AIN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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