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Texas Instruments LF444ACN/NOPB
- Part No.:
- LF444ACN/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LF444ACN/NOPB.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:446
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Product details
Overview
LF444ACN/NOPB from Texas Instruments is a quad low-power JFET-input operational amplifier designed for precision analog signal conditioning in battery-powered and space-constrained systems. It delivers 1 MHz gain-bandwidth, 1 V/μs slew rate, 50 pA (max) input bias current, and 35 nV/√Hz input voltage noise - all while drawing only 200 μA per amplifier at ±15 V supply. It is used in pH probe amplifiers, sensor front-ends, and portable instrumentation where low power and high input impedance are critical.
For engineers reviewing the LF444ACN/NOPB datasheet, LF444ACN/NOPB pinout, LF444ACN/NOPB application, or LF444ACN/NOPB equivalent, key selection considerations include its JFET-input architecture, commercial-grade temperature range (0°C to +70°C), PDIP-14 package, and pin compatibility with LM148 for direct low-power drop-in replacement in legacy designs.
Technical Context
The LF444ACN/NOPB integrates four independent JFET-input op amps on a single die, each featuring high-impedance (>10¹² Ω) inputs, rail-to-rail common-mode input range (±11 V at ±15 V supply), and output swing of ±12 V into 10 kΩ. Its BI-FET™ process enables ultra-low input bias current without external clamping diodes.
It operates from ±3 V to ±18 V supplies, supports continuous output short-circuit protection, and maintains stable AC performance (1 MHz GBW, 1 V/μs SR) across the full commercial temperature range. Input offset voltage is specified at 3 mV (max) at 25°C and 12 mV (max) over 0°C to +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±3 V to ±18 V - supports dual-supply operation in low-voltage and industrial rails without level-shifting. |
| Input Bias Current | 50 pA (max) at 25°C - enables high-impedance sensor interfacing (e.g., pH electrodes, piezoelectric transducers) with negligible loading error. |
| Gain-Bandwidth Product | 1 MHz - sufficient for DC–100 kHz closed-loop applications including active filters and precision gain stages. |
| Slew Rate | 1 V/μs - ensures faithful reproduction of fast step signals up to ~160 kHz without distortion. |
| Input Noise Voltage | 35 nV/√Hz at 1 kHz - optimized for low-noise amplification of microvolt-level sensor outputs. |
| Common-Mode Rejection | 70 dB (min) - provides robust immunity to shared-mode interference in noisy industrial environments. |
| Output Voltage Swing | ±12 V into 10 kΩ - delivers near-rail output headroom for maximum dynamic range with ±15 V supplies. |
Pinout & Package
LF444ACN/NOPB is housed in a 14-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width, 0.1-inch lead pitch, and RoHS-compliant NiPdAu lead finish. The package is rated MSL Level-1 (unlimited floor life) and compatible with standard through-hole reflow or wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Amplifier 1 Output | Single-ended output node for first op amp; drives loads up to ±12 V into 10 kΩ. |
| 2 | Amplifier 1 Inverting Input | Inverting input terminal; high-impedance JFET node with 50 pA max bias current. |
| 3 | Amplifier 1 Non-Inverting Input | Non-inverting input terminal; identical impedance and noise characteristics as Pin 2. |
| 4 | Negative Supply (V−) | Common negative rail connection for all four amplifiers; must be ≥ −18 V. |
| 5 | Amplifier 2 Non-Inverting Input | Input for second op amp; electrically isolated but shares same substrate and thermal environment. |
| 6 | Amplifier 2 Inverting Input | Inverting input for second op amp; matched to Pin 2 within typical offset specifications. |
| 7 | Amplifier 2 Output | Output for second op amp; fully independent with no crosstalk beyond −120 dB coupling. |
| 8 | Amplifier 3 Output | Output for third op amp; identical AC/DC specs as Pins 1 and 7. |
| 9 | Amplifier 3 Inverting Input | Inverting input for third op amp; supports same differential input voltage limit (±30 V). |
| 10 | Amplifier 3 Non-Inverting Input | Non-inverting input for third op amp; matches Pin 3 in bias current and CMVR. |
| 11 | Positive Supply (V+) | Common positive rail for all amplifiers; must be ≤ +18 V; decoupling recommended at this pin. |
| 12 | Amplifier 4 Non-Inverting Input | Input for fourth op amp; enables multi-channel signal conditioning on one IC. |
| 13 | Amplifier 4 Inverting Input | Inverting input for fourth op amp; supports unity-gain stable configurations. |
| 14 | Amplifier 4 Output | Final output; completes quad configuration; usable for reference buffering or active filtering. |
Key Features
| Feature | Design Value |
|---|---|
| ¼ Supply Current vs LM148 | 200 μA/amplifier max - reduces total quiescent power by 75% in quad designs versus bipolar alternatives. |
| JFET Input Stage | 10¹² Ω input resistance - eliminates need for guard rings or bias resistors in high-Z sensor interfaces. |
| Low Input Noise Current | 0.01 pA/√Hz - critical for photodiode and capacitive sensor amplification where current noise dominates. |
| Pin Compatibility with LM148 | Direct 14-pin DIP drop-in replacement - enables immediate power reduction in existing LM148-based PCBs without layout change. |
| High Common-Mode Input Range | ±11 V at ±15 V supply - accommodates wide-swing sensor signals without external level shifting. |
Applications
| pH Measurement Systems | Portable Medical Sensors |
|---|---|
|
Use Scenario: Amplifying mV-level output from glass pH electrodes in handheld meters and lab analyzers. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage with ultra-low input current to prevent electrode polarization. Use Value: 50 pA max input bias current ensures <1 mV measurement error over 24-hour calibration stability in pH 4–10 range. |
Use Scenario: Signal conditioning for ECG, pulse oximetry, and glucose strip readers in battery-operated devices. IC Role / Device Role / Timing Role: Low-power front-end amplifier for biopotential acquisition with minimal self-heating. Use Value: 200 μA per amplifier enables >100-hour battery life in AA-powered instruments while maintaining 12-bit effective resolution. |
| Industrial Sensor Transmitters | Test & Measurement Instrumentation |
|
Use Scenario: Converting 4–20 mA loop signals and RTD/thermocouple outputs in field-mounted transmitters. IC Role / Device Role / Timing Role: Rail-compatible input stage and output driver supporting 2-wire loop power constraints. Use Value: ±12 V output swing into 10 kΩ allows direct interface with ADC drivers and isolation amplifiers without gain staging. |
Use Scenario: Active filtering, reference buffering, and signal routing in benchtop multimeters and oscilloscope front-ends. IC Role / Device Role / Timing Role: Quad-channel general-purpose op amp for simultaneous signal path management. Use Value: 1 MHz GBW and 1 V/μs SR support 100 kHz anti-aliasing filters and fast-settling reference buffers with <1% error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad JFET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L4CDR | Lower supply current (125 μA/amp), narrower GBW (850 kHz), higher VOS (10 mV max), SOIC-14 only. | Better suited for ultra-low-power sub-100 kHz applications; not available in PDIP. | Select when minimizing total system current is prioritized over bandwidth and offset voltage. |
| TL074CP | Higher supply current (1.4 mA/amp), higher noise (18 nV/√Hz), same PDIP-14 package, wider GBW (3 MHz). | Preferred for audio and higher-frequency signal paths where speed outweighs power concerns. | Choose when 3 MHz bandwidth and lower cost are required, and 1.4 mA/amp quiescent current is acceptable. |
Compared with TLC27L4CDR and TL074CP, the LF444ACN/NOPB uniquely balances ultra-low input bias current (50 pA), 1 MHz bandwidth, and PDIP-14 availability - making it optimal for legacy-replacement precision sensor front-ends requiring both low power and proven through-hole manufacturability.
Availability
LF444ACN/NOPB is available at Aetrix Electronics and suitable for pH measurement systems, portable medical sensors, and industrial sensor transmitters requiring stable component supply, long-term obsolescence management, and RoHS-compliant through-hole packaging.
Supply support for LF444ACN/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 digital signal technologies, with decades of heritage in precision op amp design and manufacturing.
The LF444ACN/NOPB belongs to TI's legacy BI-FET™ op amp family, engineered specifically for low-power, high-input-impedance analog signal conditioning in industrial, test, and portable instrumentation applications.
FAQ
What is the operating temperature range for LF444ACN/NOPB?
The LF444ACN/NOPB is rated for the commercial temperature range of 0°C to +70°C. This is confirmed by TI's packaging addendum, where "C" in the part number denotes commercial grade, and the device marking "LF444ACN" explicitly identifies the A-grade (tighter VOS spec) variant in PDIP package. The LF444ACN/NOPB does not support extended or military temperature ranges.
Is LF444ACN/NOPB pin-compatible with LM148?
Yes, the LF444ACN/NOPB is pin-compatible with the LM148 in the 14-pin PDIP package. TI's datasheet states "The LF444 is pin compatible with the LM148 allowing an immediate 4 times reduction in power drain," and the connection diagram (Figure 2) confirms identical pin numbering and functional assignment across all 14 terminals.
What is the maximum supply voltage for LF444ACN/NOPB?
The absolute maximum supply voltage for LF444ACN/NOPB is ±18 V, as specified in the Absolute Maximum Ratings table. Operation beyond this limit risks permanent damage. For reliable long-term use, TI recommends staying within ±15 V under normal conditions, where full DC and AC specifications are guaranteed.
Does LF444ACN/NOPB require input clamping diodes?
No, the LF444ACN/NOPB does not require external input clamping diodes. Its JFET input stage features high reverse breakdown voltage between gate and source/drain, enabling safe operation with large differential input voltages (up to ±30 V) without increased input current - a key advantage over bipolar-input op amps like the LM148.
What is the typical input offset voltage for LF444ACN/NOPB?
The typical input offset voltage for LF444ACN/NOPB is 5 mV at 25°C, with a maximum of 3 mV for the "A" grade at 25°C and 12 mV over the full 0°C to +70°C operating range. These values are specified in TI's DC Electrical Characteristics table and distinguish the LF444A variant (tighter VOS) from the standard LF444.
LF444ACN/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 600µA (x4 Channels)
- Current - Output / Channel:
- 14 mA
- Voltage - Supply Span (Min):
- 44 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LF444ACN/NOPB FAQ
1.How can I place an order for LF444ACN/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LF444ACN/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 LF444ACN/NOPB reliable?
The price and inventory of LF444ACN/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF444ACN/NOPB is usually 5 days.
3.What payment methods are accepted for LF444ACN/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF444ACN/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF444ACN/NOPB?
LF444ACN/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF444ACN/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 LF444ACN/NOPB?
For technical support, including LF444ACN/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF444ACN/NOPB requirements.
6.How does Aetrix verify that LF444ACN/NOPB is sourced from the original manufacturer or authorized distributors?
All LF444ACN/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 LF444ACN/NOPB meets industry standards.
7.What is the process for return or replacement of LF444ACN/NOPB?
All LF444ACN/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LF444ACN/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 LF444ACN/NOPB part is unused and in its original packaging.
Return procedure for LF444ACN/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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