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Texas Instruments LF347BN/PB
- Part No.:
- LF347BN/PB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LF347BN/PB.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
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Product details
Overview
LF347BN/PB 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 commercial temperature range (0°C to 70°C) in a 14-pin PDIP package.
For engineers reviewing the LF347BN/PB datasheet, LF347BN/PB pinout, LF347BN/PB application, or LF347BN/PB equivalent, key selection criteria include JFET-input impedance (>10¹² Ω), low 1/f noise corner (50 Hz), fast 2 μs settling to 0.01%, and compatibility with ±15 V supplies while maintaining stable AC performance up to 4 MHz.
Technical Context
The LF347BN/PB implements BI-FET II™ technology, integrating matched high-voltage JFET input stages with internally trimmed offset voltage circuitry to achieve low drift and high common-mode rejection (80 dB min). Its zener-biased input stage enables operation down to ±4.5 V supplies without gain-bandwidth collapse.
Each of the four amplifiers operates independently with rail-to-rail output swing capability (±12 V into 10 kΩ), low total harmonic distortion (≤0.02%), and robust input protection-no external clamps required due to high gate-source breakdown voltage of the JFET inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 4 MHz - supports stable unity-gain stable configurations up to 4 MHz and closed-loop bandwidths >1 MHz at moderate gains. |
| Slew Rate | 13 V/μs - enables accurate reproduction of fast-rising signals such as DAC outputs or pulse waveforms without slew-induced distortion. |
| 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 DC-coupled signal chains without requiring external nulling circuitry. |
| Common-Mode Rejection | 80 dB min - maintains accuracy when amplifying small differential signals riding on large common-mode voltages. |
| Supply Voltage Range | ±15 V - compatible with standard dual-rail lab and industrial power supplies; functional down to ±4.5 V. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems, test equipment, and industrial control modules. |
Pinout & Package
LF347BN/PB 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, with through-hole mounting and RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8, 12 | Output | Four independent buffered outputs; each capable of ±12 V swing into 10 kΩ load. |
| 2, 6, 9, 13 | Inverting Input (−) | Differential input terminals accepting signals referenced to ground or virtual ground; high-impedance JFET node. |
| 3, 7, 10, 14 | Non-Inverting Input (+) | Differential input terminals with identical JFET characteristics; tolerant of common-mode voltages up to ±11 V. |
| 4 | V− Supply | Negative supply rail connection; must remain ≥ −15 V to avoid exceeding absolute maximum ratings. |
| 11 | V+ Supply | Positive supply rail connection; must remain ≤ +15 V; decoupling recommended within 1 cm. |
Key Features
| Feature | Design Value |
|---|---|
| Internally trimmed offset voltage | 5 mV max eliminates need for external nulling potentiometers in production systems. |
| JFET input stage | 10¹² Ω input resistance enables direct interfacing with piezoelectric sensors, photodiode transimpedance nodes, and high-Z filter networks. |
| Low 1/f noise corner | 50 Hz ensures minimal low-frequency noise contribution in DC-coupled instrumentation and precision measurement front-ends. |
| Fast 0.01% settling | 2 μs allows use in multiplexed data acquisition systems with sampling rates up to 400 kSPS per channel. |
| High slew rate & GBW synergy | 13 V/μs slew rate fully supports full-power bandwidth of ~1.5 MHz at ±10 V output swing, matching 4 MHz GBW capability. |
Applications
| High-Speed Data Acquisition | Precision Sensor Signal Conditioning |
|---|---|
Use Scenario: Multiplexed analog input channel buffering before ADC sampling in automated test equipment. IC Role / Device Role / Timing Role: Quad buffer isolating source impedance, driving 10 kΩ ADC input while maintaining phase coherence across channels. Use Value: 2 μs settling to 0.01% enables 400 kSPS effective throughput without inter-channel crosstalk or settling error. | Use Scenario: Amplifying low-level output from strain gauge bridge or thermopile in industrial monitoring system. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end stage providing high-Z differential gain with minimal bias current error. Use Value: 50 pA input bias current prevents millivolt-level offset errors in 100 kΩ+ bridge arms; 5 mV VOS avoids calibration overhead. |
| Programmable Gain Analog Front-End | Active Filter Building Block |
Use Scenario: Digitally selectable attenuator network using switched resistor arrays and op-amp summing configuration. IC Role / Device Role / Timing Role: Quad op-amp implementing digitally controlled attenuation stages with unity-gain stability and wide bandwidth. Use Value: 4 MHz GBW supports flat frequency response up to 1 MHz across all 8 attenuation states; no phase reversal observed under digital switching transients. | Use Scenario: Second-order state-variable filter for anti-aliasing or tone generation in audio and communications subsystems. IC Role / Device Role / Timing Role: Core integrator and summer in universal filter topology requiring matched AC performance across all four sections. Use Value: Matched slew rate (13 V/μs) and GBW (4 MHz) across all four amplifiers ensure consistent Q-factor and center frequency accuracy up to 3 kHz. |
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 |
|---|---|---|---|
| TL074CP | Lower slew rate (13 V/μs same, but typical 10 V/μs); higher input noise voltage (18 nV/√Hz vs. 20 nV/√Hz); same 4 MHz GBW. | Less suitable for fast-settling DAC buffers; acceptable for general-purpose filtering and non-critical signal conditioning. | Select TL074CP only when cost sensitivity outweighs need for guaranteed 2 μs 0.01% settling or lowest possible IB. |
| OPA4134UA | Higher precision: 0.5 mV VOS max, 10 pA IB typ, 8 MHz GBW, but requires ±18 V max supply and costs significantly more. | Targeted at audio and metrology where ultra-low distortion (<0.00008%) and sub-mV offset are mandatory. | Choose OPA4134UA only when LF347BN/PB's 5 mV VOS or 50 pA IB fails system-level accuracy budget. |
Compared with TL074CP and OPA4134UA, the LF347BN/PB offers the optimal balance of speed (4 MHz/13 V/μs), JFET-input integrity (50 pA IB), and commercial-grade affordability-making it the preferred choice for cost-sensitive, high-fidelity analog signal paths where 2 μs settling and 0.02% THD are design requirements.
Availability
LF347BN/PB is available at Aetrix Electronics and suitable for high-speed data acquisition, precision sensor interfaces, programmable gain analog front-ends, and active filter designs requiring stable component supply and long-term manufacturability.
Supply support for LF347BN/PB 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 connectivity solutions for industrial, automotive, and consumer applications.
The LF347BN/PB belongs to TI's legacy BI-FET II™ op-amp family, engineered specifically for applications demanding JFET-input performance-high input impedance, low bias current, and wide bandwidth-at accessible price points for commercial-grade systems.
FAQ
What is the maximum supply voltage rating for the LF347BN/PB?
The LF347BN/PB has an absolute maximum supply voltage rating of ±18 V. Operation is specified over ±15 V, and the device remains functional down to ±4.5 V. Exceeding ±18 V risks permanent damage. The LF347BN/PB datasheet specifies that continuous operation above ±15 V is not recommended for reliability or parametric guarantee.
Does the LF347BN/PB require external offset nulling circuitry?
No, the LF347BN/PB does not require external offset nulling. It features internally trimmed input offset voltage, with a maximum specification of 5 mV across temperature. This eliminates the need for external potentiometers or trimming networks in most production applications, simplifying PCB layout and reducing bill-of-materials cost.
Can the LF347BN/PB drive a 2 kΩ load effectively?
Yes, the LF347BN/PB is characterized to drive a 2 kΩ load to ±10 V over the full 0°C to 70°C operating range. Output voltage swing degrades slightly under heavier loads, but the device maintains specified slew rate and linearity at this load. For sustained ±10 V output into 2 kΩ, ensure adequate thermal derating and local supply decoupling.
Is the LF347BN/PB pin-compatible with the LM148?
No-the LF347BN/PB is not pin-compatible with the LM148. While the earlier LF147 variant is explicitly stated as pin-compatible with the LM148, the LF347 series (including LF347BN/PB) shares the same 14-pin PDIP footprint but differs in internal biasing and absolute maximum ratings (e.g., ±18 V vs. ±22 V). Direct substitution may risk overstress under identical supply conditions.
What is the input common-mode voltage range for the LF347BN/PB?
The LF347BN/PB supports an input common-mode voltage range of ±11 V with ±15 V supplies. This means both inputs can operate between −11 V and +11 V relative to ground. Exceeding the negative limit (−11 V) forces the output high; exceeding the positive limit (+11 V) on both inputs also forces high output-neither condition causes latch-up, and normal operation resumes once inputs return within range.
LF347BN/PB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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/PB FAQ
1.How can I place an order for LF347BN/PB through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347BN/PB 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/PB reliable?
The price and inventory of LF347BN/PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347BN/PB is usually 5 days.
3.What payment methods are accepted for LF347BN/PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347BN/PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347BN/PB?
LF347BN/PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347BN/PB 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/PB?
For technical support, including LF347BN/PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347BN/PB requirements.
6.How does Aetrix verify that LF347BN/PB is sourced from the original manufacturer or authorized distributors?
All LF347BN/PB 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/PB meets industry standards.
7.What is the process for return or replacement of LF347BN/PB?
All LF347BN/PB units undergo pre-shipment inspection (PSI). If there is an issue with LF347BN/PB, 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/PB part is unused and in its original packaging.
Return procedure for LF347BN/PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF347BN/PB Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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