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Texas Instruments LF347MX/NOPB
- Part No.:
- LF347MX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF347MX/NOPB.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,425
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Product details
Overview
LF347MX/NOPB from Texas Instruments is a quad JFET-input operational amplifier optimized for high-speed, low-input-bias-current applications. It delivers 4 MHz gain-bandwidth, 13 V/μs slew rate, 5 mV max input offset voltage, and 50 pA typical input bias current. It operates from ±15 V supplies and targets precision analog signal conditioning in test equipment and data acquisition systems.
For engineers reviewing the LF347MX/NOPB datasheet, LF347MX/NOPB pinout, LF347MX/NOPB application, or LF347MX/NOPB equivalent, key selection criteria include its JFET input stage enabling high-impedance sensing, wide bandwidth for fast settling, low noise (20 nV/√Hz), and SOIC-14 packaging suitable for space-constrained industrial PCBs.
Technical Context
The LF347MX/NOPB implements a BI-FET II™ architecture with matched high-voltage JFET input pairs, delivering ultra-low input bias current and high common-mode rejection (≥70 dB). Its internal zener biasing enables stable operation down to ±4.5 V supplies while maintaining specified AC performance.
It features rail-to-rail output swing capability (±12 V into 10 kΩ) and robust input protection-no external clamps needed due to high gate-source breakdown voltage. The device supports unity-gain stable operation and exhibits fast 2 μs settling to 0.01% under defined load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 4 MHz - Enables stable closed-loop operation up to 400 kHz at gain = 10 without phase margin degradation. |
| Slew Rate | 13 V/μs - Supports full-scale step response in <1 μs for ±10 V outputs, critical for D/A converter buffering. |
| Input Bias Current | 50 pA typ - Minimizes voltage error across high-impedance sensor sources (e.g., pH electrodes, photodiodes). |
| Input Offset Voltage | 5 mV max - Reduces DC error in precision integrators and summing amplifiers without external trimming. |
| Supply Voltage Range | ±15 V - Compatible with standard bipolar lab power rails and legacy industrial control systems. |
| Common-Mode Rejection | 70 dB min - Maintains accuracy when amplifying small differential signals amid noisy ground references. |
| THD | ≤0.02% - Preserves signal fidelity in audio and instrumentation-grade signal chains. |
Pinout & Package
LF347MX/NOPB uses a 14-pin SOIC (D0014A) package measuring 8.75 mm × 3.91 mm × 1.75 mm, RoHS-compliant with Sn finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output; drives loads up to ±12 V into 10 kΩ with minimal distortion. |
| 2 | Inverting Input A | Differential input node for channel A; high-impedance JFET input minimizes loading of source. |
| 3 | Non-Inverting Input A | Positive input for channel A; accepts common-mode voltages up to ±11 V with full gain. |
| 4 | V– | Negative supply rail; must be ≥ −15 V and referenced to system ground for proper biasing. |
| 5 | Non-Inverting Input B | Positive input for channel B; electrically isolated from other channels for multi-channel signal routing. |
| 6 | Inverting Input B | Inverting node for channel B; matches channel A's input characteristics for consistent gain staging. |
| 7 | Output B | Amplifier B output; identical AC/DC specs to pin 1 for synchronous dual-path designs. |
| 8 | Output C | Amplifier C output; enables three independent gain stages or cascaded filtering without external op-amps. |
| 9 | Inverting Input C | Inverting input for channel C; supports precision inverting configurations with low input current error. |
| 10 | Non-Inverting Input C | Positive input for channel C; maintains high CMRR even with asymmetric source impedances. |
| 11 | V+ | Positive supply rail; must be ≤ +15 V; decoupling capacitor required near pin for stability. |
| 12 | Non-Inverting Input D | Positive input for channel D; allows four-channel simultaneous sampling or independent sensor conditioning. |
| 13 | Inverting Input D | Inverting node for channel D; matches input capacitance and bias current of other channels. |
| 14 | Output D | Amplifier D output; completes quad functionality for compact multi-function analog front-ends. |
Key Features
| Feature | Design Value |
|---|---|
| Internally trimmed offset voltage | 5 mV max eliminates need for external nulling circuitry in production test equipment. |
| JFET input stage | 50 pA bias current enables direct interfacing with high-impedance piezoelectric sensors and electret microphones. |
| Low 1/f noise corner | 50 Hz ensures stable DC-coupled performance in long-time-constant integrators and precision DC measurement. |
| Fast 0.01% settling | 2 μs supports high-throughput data acquisition at >100 kSPS with 12-bit+ linearity. |
| High input impedance | 10¹² Ω prevents loading of passive filter networks and high-Z transducer elements. |
Applications
| Test & Measurement Instrumentation | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying low-level thermocouple or strain gauge signals in benchtop multimeters and oscilloscope input stages. IC Role / Device Role / Timing Role: Primary signal-conditioning amplifier providing gain, offset correction, and drive capability before ADC sampling. Use Value: 50 pA input bias current avoids millivolt-level errors across 10 MΩ sensor bridges; 4 MHz bandwidth preserves rise time integrity for transient capture. | Use Scenario: Buffering multiplexed analog inputs in 16-channel industrial DAQ modules with shared reference and clock domains. IC Role / Device Role / Timing Role: Quad-channel input buffer isolating each channel from crosstalk and ensuring matched settling behavior across all 16 paths. Use Value: Identical pinout and specs across all four amplifiers enable single layout reuse; 2 μs settling guarantees synchronized sampling within 0.01% accuracy. |
| Audio Signal Processing | Industrial Sensor Interface |
Use Scenario: Implementing active anti-aliasing filters and line-driver stages in professional audio converters operating at 96 kHz sample rates. IC Role / Device Role / Timing Role: Dual-channel filter section (LPF/BPF) followed by low-distortion output driver for balanced XLR interface. Use Value: ≤0.02% THD maintains dynamic range above 90 dB; 13 V/μs slew rate prevents slew-induced distortion on 20 kHz full-scale sine waves. | Use Scenario: Conditioning outputs from capacitive humidity sensors and MEMS accelerometers in factory automation nodes. IC Role / Device Role / Timing Role: Transimpedance amplifier and programmable-gain stage converting picoamp-level currents to robust voltage signals. Use Value: 20 nV/√Hz input noise preserves SNR in sub-100 µV sensor outputs; high CMRR rejects EMI from nearby motor drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad JFET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L4CD | Lower supply current (1.4 mA vs. 7.2 mA), reduced GBW (1.7 MHz), higher VOS (10 mV max) | Better suited for battery-powered portable instruments where power efficiency outweighs speed | Select TLC27L4CD only when supply current <2 mA is mandatory and bandwidth ≤1.7 MHz suffices. |
| TL084CD | Higher slew rate (13 V/μs same), identical GBW (4 MHz), but higher input bias current (200 pA typ) | Acceptable where moderate input impedance (10¹⁰ Ω) is sufficient and cost is primary constraint | Choose TL084CD if design tolerates 4× higher input bias current and no 50 pA requirement exists. |
Compared with TLC27L4CD and TL084CD, LF347MX/NOPB uniquely balances low input bias current (50 pA), wide bandwidth (4 MHz), and low offset (5 mV max) in a single SOIC-14 package-making it optimal for high-fidelity, multi-channel analog signal chains where precision and speed coexist.
Availability
LF347MX/NOPB is available at Aetrix Electronics and suitable for test & measurement instrumentation, industrial data acquisition systems, and audio signal processing requiring stable component supply and long-term manufacturability.
Supply support for LF347MX/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 over 50 years of op-amp innovation.
The LF347MX/NOPB belongs to TI's legacy BI-FET II™ op-amp family, engineered for high-speed, low-input-current precision analog signal conditioning in industrial, test, and audio applications.
FAQ
What is the maximum supply voltage for LF347MX/NOPB?
The LF347MX/NOPB supports a maximum supply voltage of ±15 V. Exceeding this limit risks permanent damage, as confirmed by TI's Absolute Maximum Ratings table. Operation at ±15 V ensures full specification compliance for parameters including gain-bandwidth, slew rate, and output swing. Derating is required above ambient temperature to maintain junction temperature below 150°C.
Does LF347MX/NOPB require external offset nulling?
No, LF347MX/NOPB does not require external offset nulling. Its internally trimmed input offset voltage is guaranteed ≤5 mV maximum at 25°C, eliminating the need for external potentiometers or calibration circuitry in most precision applications. This simplifies PCB layout and improves long-term drift stability compared to untrimmed op-amps like the TL084.
Can LF347MX/NOPB drive a 2 kΩ load to ±10 V?
Yes, LF347MX/NOPB can drive a 2 kΩ load to ±10 V over the full 0°C to 70°C operating temperature range, as verified in TI's DC Electrical Characteristics table. This capability supports direct interfacing with legacy test equipment inputs and modular analog I/O standards without additional buffer stages.
What is the input common-mode voltage range for LF347MX/NOPB?
The input common-mode voltage range for LF347MX/NOPB is ±11 V with ±15 V supplies, meaning both inputs can operate between −11 V and +11 V relative to ground. Exceeding the negative limit forces output high; exceeding both limits simultaneously also forces high output-neither condition causes latch-up, and normal operation resumes once inputs return within range.
Is LF347MX/NOPB pin-compatible with LM148?
No, LF347MX/NOPB is not pin-compatible with LM148. While the earlier LF147 is explicitly stated as pin-compatible with LM148, the LF347 series-including LF347MX/NOPB-is a commercial-grade variant with different absolute maximum ratings (e.g., ±18 V vs. ±22 V) and thermal characteristics. Pin mapping matches the standard quad op-amp SOIC-14 footprint but electrical compatibility requires verification per application conditions.
LF347MX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 13V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 7.2mA (x4 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LF347MX/NOPB FAQ
1.How can I place an order for LF347MX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347MX/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 LF347MX/NOPB reliable?
The price and inventory of LF347MX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347MX/NOPB is usually 5 days.
3.What payment methods are accepted for LF347MX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347MX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347MX/NOPB?
LF347MX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347MX/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 LF347MX/NOPB?
For technical support, including LF347MX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347MX/NOPB requirements.
6.How does Aetrix verify that LF347MX/NOPB is sourced from the original manufacturer or authorized distributors?
All LF347MX/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 LF347MX/NOPB meets industry standards.
7.What is the process for return or replacement of LF347MX/NOPB?
All LF347MX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LF347MX/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 LF347MX/NOPB part is unused and in its original packaging.
Return procedure for LF347MX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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