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Texas Instruments LF347BN/NOPB
- Part No.:
- LF347BN/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LF347BN/NOPB.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:540
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Product details
Overview
LF347BN/NOPB from Texas Instruments is a quad JFET-input operational amplifier optimized for high-speed, low-input-bias-current applications including precision integrators, sample-and-hold circuits, and D/A converter buffers. It delivers 4 MHz gain-bandwidth, 13 V/μs slew rate, 5 mV max input offset voltage, and 50 pA typical input bias current across the 0°C to 70°C commercial temperature range in a 14-pin PDIP package.
For engineers reviewing the LF347BN/NOPB datasheet, LF347BN/NOPB pinout, LF347BN/NOPB application, or LF347BN/NOPB equivalent, key selection criteria include its JFET-input architecture enabling ultra-low IB, wide supply range (±18 V), fast settling to 0.01% in 2 μs, and compatibility with legacy LM124/LM148 layouts where higher bandwidth and lower noise are required.
Technical Context
The LF347BN/NOPB uses BI-FET II™ technology, integrating matched high-voltage JFET input stages with bipolar output circuitry to achieve both high input impedance (10¹² Ω) and robust output drive capability. Its internally trimmed offset voltage eliminates external nulling components in precision DC-coupled designs.
It operates from ±4.5 V to ±18 V supplies, supports rail-to-rail common-mode input up to ±15 V, and maintains stable performance under capacitive loads up to 10 pF without external compensation-enabling direct interface with ADC sample capacitors and DAC outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 4 MHz - enables stable unity-gain operation up to 4 MHz or closed-loop gain of 10 at 400 kHz |
| Slew Rate | 13 V/μs - supports full-scale 20 Vpp output swing at 200 kHz without slew limiting |
| Input Bias Current | 50 pA typ - minimizes voltage error in high-impedance sensor interfaces and integrator feedback networks |
| Input Offset Voltage | 5 mV max - reduces DC error in precision amplification without trimming circuitry |
| Supply Voltage Range | ±18 V - accommodates industrial signal chains requiring wide dynamic range and headroom |
| Common-Mode Input Range | ±15 V - allows direct connection to ±12 V rails or single-supply configurations with level-shifting |
| Total Harmonic Distortion | ≤0.02% - preserves fidelity in audio and instrumentation signal conditioning paths |
Pinout & Package
LF347BN/NOPB is housed in a 14-pin plastic dual in-line package (PDIP, package code N), 19.15 mm × 6.22 mm footprint, 5.08 mm max height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output; capable of ±13.5 V swing into 10 kΩ load |
| 2 | Inverting Input A | Differential input node for amplifier A; high-impedance JFET gate structure |
| 3 | Non-Inverting Input A | Differential input node for amplifier A; identical bias and noise characteristics as Pin 2 |
| 4 | V– | Negative supply rail connection; must be ≥ −18 V and not exceeded by input voltages |
| 5 | Non-Inverting Input B | Amplifier B non-inverting input; electrically isolated but thermally coupled to other sections |
| 6 | Inverting Input B | Amplifier B inverting input; matches Pin 2 in offset and bias current specs |
| 7 | Output B | Amplifier B output; fully independent output stage with same drive capability as Pin 1 |
| 8 | Output C | Amplifier C output; shares same thermal and electrical environment as Pins 1 and 7 |
| 9 | Inverting Input C | Amplifier C inverting input; matched to other inputs for multi-channel common-mode rejection |
| 10 | Non-Inverting Input C | Amplifier C non-inverting input; supports simultaneous multi-stage filtering or gain distribution |
| 11 | V+ | Positive supply rail connection; must be ≤ +18 V and referenced to Pin 4 ground path |
| 12 | Non-Inverting Input D | Amplifier D non-inverting input; enables four independent channels on single die |
| 13 | Inverting Input D | Amplifier D inverting input; verified matching within 25 pA IB and 1 mV VOS across all four amps |
| 14 | Output D | Amplifier D output; completes quad configuration with identical AC/DC specs to Pins 1, 7, and 8 |
Key Features
| Feature | Design Value |
|---|---|
| Internally trimmed offset voltage | 5 mV max eliminates need for external nulling potentiometers in production systems |
| JFET input stage | 50 pA typical input bias current enables use with >100 MΩ source impedances without significant error |
| Low 1/f noise corner | 50 Hz allows stable DC-coupled operation in precision measurement front-ends down to sub-Hz frequencies |
| Fast 0.01% settling time | 2 μs supports high-throughput data acquisition systems sampling at ≥500 kSPS |
| High CMRR & PSRR | 80 dB min ensures immunity to power rail noise and common-mode interference in noisy industrial environments |
Applications
| Instrumentation Amplifier Front-End | Precision Integrator for Energy Metering |
|---|---|
Use Scenario: Amplifying low-level bridge sensor outputs (e.g., load cells, RTDs) in industrial weighing systems with 24-bit ADCs. IC Role / Device Role / Timing Role: First-stage differential amplifier providing gain and common-mode rejection before programmable gain stage. Use Value: 10¹² Ω input impedance prevents loading of high-Z Wheatstone bridges; 5 mV VOS contributes <0.05% full-scale error at 100 mV input span. | Use Scenario: Converting current pulses from shunt resistors into proportional voltage integrals for kWh calculation in smart meters. IC Role / Device Role / Timing Role: Low-drift integrator core with reset switch, holding accumulated charge between metering intervals. Use Value: 50 pA IB limits integration error to <1 LSB over 1-second interval with 1 nF capacitor; 2 μs settling ensures accurate start-of-integration timing. |
| Digital Attenuator Control Interface | Active Filter Bank in Audio Signal Path |
Use Scenario: Digitally selectable gain/attenuation stages using analog switches and precision resistor ladders in test equipment. IC Role / Device Role / Timing Role: Buffer and summing amplifier driving switched resistor networks while maintaining high input impedance. Use Value: Quad configuration allows independent buffering of three digital control lines plus one summed output; 4 MHz GBW supports glitch-free switching at ≥100 kHz update rates. | Use Scenario: Implementing cascaded biquad filters for equalization and anti-aliasing in professional audio DAC outputs. IC Role / Device Role / Timing Role: State-variable filter section providing simultaneous low-pass, band-pass, and high-pass outputs. Use Value: 13 V/μs slew rate enables 10 Vpp output at 20 kHz without distortion; ≤0.02% THD preserves audio fidelity across 20 Hz–20 kHz bandwidth. |
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 |
|---|---|---|---|
| TLC27L4CDR | Lower supply current (1.4 mA vs. 7.2 mA), narrower GBW (850 kHz), higher VOS (10 mV max) | Better suited for battery-powered portable instruments where power dominates performance trade-offs | Select when ultra-low quiescent current is mandatory and bandwidth <1 MHz suffices |
| TL084CDR | Higher slew rate (13 V/μs same), wider GBW (3 MHz vs. 4 MHz), higher IB (30 pA vs. 50 pA typ), no internal offset trim | Requires external nulling for DC-critical applications; preferred where cost sensitivity outweighs trimming convenience | Select when budget constraints preclude trimmed-offset devices and layout allows manual calibration |
Compared with TLC27L4CDR and TL084CDR, the LF347BN/NOPB provides superior bandwidth and guaranteed low offset without external components-making it optimal for production-grade instrumentation where repeatability, speed, and ease of integration are prioritized over minimal power draw or lowest unit cost.
Availability
LF347BN/NOPB is available at Aetrix Electronics and suitable for precision analog signal conditioning, industrial sensor interfacing, and high-fidelity audio processing requiring stable component supply and long-term manufacturability.
Supply support for LF347BN/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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The LF347BN/NOPB belongs to TI's legacy precision op amp portfolio designed specifically for high-speed, low-input-current applications demanding JFET input performance with production-ready reliability and pin compatibility to industry-standard quad op amps.
FAQ
What is the maximum supply voltage for LF347BN/NOPB?
The absolute maximum supply voltage for LF347BN/NOPB is ±18 V. Operation beyond this limit risks permanent damage. The device is fully specified for operation from ±4.5 V to ±15 V, with performance metrics such as gain-bandwidth and slew rate degrading below ±4.5 V. For reliable long-term use, maintain supply rails within ±15 V under normal conditions and ensure transient spikes do not exceed ±18 V.
Does LF347BN/NOPB require external offset nulling?
No, LF347BN/NOPB does not require external offset nulling. It features internally trimmed input offset voltage with a maximum of 5 mV across temperature, eliminating the need for external potentiometers or calibration circuitry. This simplifies PCB layout and improves production yield in precision analog designs where drift and manual adjustment are undesirable.
Can LF347BN/NOPB drive capacitive loads directly?
Yes, LF347BN/NOPB can drive capacitive loads up to 10 pF without external compensation, as confirmed in TI's typical performance curves and application notes. For larger loads (e.g., ADC input capacitance >10 pF), a series isolation resistor (typically 10–100 Ω) is recommended between the output and the load to maintain phase margin and prevent peaking or oscillation.
Is LF347BN/NOPB pin-compatible with LM124 or LM148?
LF347BN/NOPB is pin-compatible with LM148 but not with LM124. Both LF347 and LM148 use the same 14-pin PDIP pinout (N package), allowing direct replacement in existing LM148 layouts. However, LM124 is a quad BJT-input op amp in a 14-pin SOIC or PDIP but with different internal routing and biasing-substitution requires verification of input stage compatibility and supply current impact.
What is the input common-mode voltage range for LF347BN/NOPB?
The input common-mode voltage range for LF347BN/NOPB is ±15 V when operated at ±15 V supplies. This means both inputs can swing from −15 V to +15 V relative to ground without phase reversal or clipping. Exceeding the negative common-mode limit (e.g., below −15 V) forces the output high; exceeding the positive limit on both inputs also forces high output, but no latch-up occurs-operation resumes normally once inputs return within range.
LF347BN/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:
- 13V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 7.2mA (x4 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 36 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LF347BN/NOPB FAQ
1.How can I place an order for LF347BN/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347BN/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 LF347BN/NOPB reliable?
The price and inventory of LF347BN/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347BN/NOPB is usually 5 days.
3.What payment methods are accepted for LF347BN/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347BN/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347BN/NOPB?
LF347BN/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347BN/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 LF347BN/NOPB?
For technical support, including LF347BN/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347BN/NOPB requirements.
6.How does Aetrix verify that LF347BN/NOPB is sourced from the original manufacturer or authorized distributors?
All LF347BN/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 LF347BN/NOPB meets industry standards.
7.What is the process for return or replacement of LF347BN/NOPB?
All LF347BN/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LF347BN/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 LF347BN/NOPB part is unused and in its original packaging.
Return procedure for LF347BN/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF347BN/NOPB Tags
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