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Texas Instruments LF347BN
- Part No.:
- LF347BN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LF347BN.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,120
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Product details
Overview
LF347BN from Texas Instruments is a JFET-input quad operational amplifier in 14-pin PDIP package, delivering 3 MHz gain bandwidth, 13 V/μs slew rate, and 50 pA typical input bias current for precision analog signal conditioning in industrial power electronics and test equipment.
For engineers reviewing the LF347BN datasheet, LF347BN pinout, LF347BN application, or LF347BN equivalent, this page provides verified electrical specifications, thermal performance data, dual-supply operating limits (±3.5 V to ±18 V), and real-world implementation guidance for high-impedance sensor interfaces and active filter designs.
Technical Context
The LF347BN integrates four independent JFET-input op-amps on a single monolithic die, each featuring high-impedance inputs (10¹² Ω), bipolar output stages with 200-Ω short-circuit protection, and matched internal characteristics across amplifiers. Its architecture supports both single-supply (≥3.5 V) and dual-supply (±3.5 V to ±18 V) operation without functional mode switching.
Input common-mode range extends to within 4 V of either supply rail (VCC– + 4 V to VCC+ – 4 V), while output swing reaches ±13.5 V into 10-kΩ load. The device is characterized for 0°C to 70°C ambient operation and exhibits 80 dB CMRR and 80 dB PSRR in the LF347B variant, confirming its suitability for noise-sensitive instrumentation front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 3 MHz typical - enables stable unity-gain compensation and accurate wideband signal amplification up to audio frequencies. |
| Slew Rate | 13 V/μs typical - supports fast transient response in pulse amplification and active filter applications without distortion. |
| Input Bias Current | 50 pA typical at 25°C - permits use of high-value feedback resistors (>1 MΩ) without significant DC error in sensor interfaces. |
| Input Resistance | 10¹² Ω - ensures minimal loading of high-impedance sources such as piezoelectric sensors and photodiode transimpedance stages. |
| Supply Voltage Range | ±3.5 V to ±18 V dual supply - accommodates standard ±5 V, ±12 V, and ±15 V industrial rails with headroom for signal swing. |
| Common-Mode Input Range | VCC– + 4 V to VCC+ – 4 V - allows direct interfacing with signals referenced to supply rails in motor control feedback loops. |
| Output Short-Circuit Protection | 200-Ω series output impedance - limits fault current to safe levels during accidental shorts, eliminating need for external current-limiting components. |
Pinout & Package
LF347BN uses a 14-pin plastic dual in-line package (PDIP) with 19.30 mm × 6.35 mm body size and through-hole mounting. Pin 1 is identified by a notch or dot; leads are spaced 2.54 mm (0.1 inch) apart.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | Amplifier outputs (1OUT, 2OUT, 3OUT, 4OUT) | Low-impedance buffered outputs capable of ±13.5 V swing into 10-kΩ loads; internally limited to 200 Ω for short-circuit protection. |
| 2, 6, 9, 13 | Inverting inputs (1IN–, 2IN–, 3IN–, 4IN–) | High-impedance JFET inputs accepting differential signals; require matched source impedances to minimize offset drift. |
| 3, 5, 10, 12 | Noninverting inputs (1IN+, 2IN+, 3IN+, 4IN+) | High-impedance JFET inputs supporting rail-to-rail common-mode range within 4 V of supplies; used for unity-gain buffers and summing nodes. |
| 4, 11 | Power supply terminals (VCC+, VCC–) | Dual-supply pins requiring local 0.1-μF ceramic bypass capacitors placed adjacent to each pin to suppress high-frequency noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Low input bias current | 50 pA typical enables >10-MΩ feedback networks in precision integrators and electrometer-grade measurement circuits. |
| High CMRR and PSRR | 80 dB minimum ensures rejection of power supply ripple and common-mode interference in noisy industrial environments. |
| JFET input stage | 10¹² Ω input resistance preserves signal integrity when interfacing with high-Z sources like pH electrodes and capacitive sensors. |
| Thermal stability | 18 µV/°C input offset drift supports consistent DC accuracy over 0°C–70°C operating range without recalibration. |
| Quad amplifier integration | Four independent op-amps reduce board space and component count in multi-channel signal conditioning systems such as oscilloscope front-ends. |
Applications
| Motor Control Feedback | Solar Inverter Sensing |
|---|---|
Use Scenario: Amplifying current-sense resistor voltage in three-phase IGBT gate driver feedback loops. IC Role / Device Role / Timing Role: Quad op-amp configured as differential amplifiers for isolated current monitoring and DC bus voltage scaling. Use Value: 50 pA input bias minimizes offset error from high-value sense resistors; 13 V/μs slew rate captures fast switching transients without distortion. |
Use Scenario: Conditioning photovoltaic array voltage and current signals prior to ADC sampling in MPPT controllers. IC Role / Device Role / Timing Role: Precision buffer and gain stage for low-noise analog front-end before isolation and digitization. Use Value: 10¹² Ω input resistance prevents loading of high-impedance solar panel outputs; 3 MHz bandwidth supports fast MPPT algorithm updates. |
| Oscilloscope Vertical Amplifier | Pro Audio Mixer Channel |
Use Scenario: Signal amplification and offset adjustment in analog vertical deflection circuitry of benchtop oscilloscopes. IC Role / Device Role / Timing Role: High-speed, low-distortion gain block with adjustable DC offset for calibrated waveform display. Use Value: 0.01 pA/√Hz input noise current and 18 nV/√Hz input voltage noise preserve signal fidelity; 3 MHz GBW supports 10-MHz analog bandwidth. |
Use Scenario: Pre-amplification and tone-shaping in discrete-channel analog mixing consoles. IC Role / Device Role / Timing Role: Low-noise, low-THD signal path element for microphone preamp and equalizer stages. Use Value: Low total harmonic distortion and 13 V/μs slew rate prevent clipping on transient-rich audio signals; quad configuration reduces channel crosstalk. |
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 |
|---|---|---|---|
| TL074CN | Higher input bias current (30 pA typ vs. 50 pA typ), lower slew rate (13 V/μs vs. 13 V/μs), identical PDIP-14 package. | Lower cost but reduced input impedance (10¹² Ω vs. 10¹² Ω); same thermal rating (0°C–70°C). | Preferred where lower input bias is not critical and cost sensitivity dominates; requires verification of offset voltage drift in long-term measurements. |
| LF353N | Dual-channel version (vs. quad), higher gain bandwidth (4 MHz vs. 3 MHz), same 50 pA input bias and PDIP-8 package. | Requires two devices to match LF347BN channel count; smaller footprint per amplifier but higher total board area. | Select when only two amplifiers are needed per board section or when tighter layout constraints favor dual packages over quad. |
Compared with TL074CN and LF353N, the LF347BN offers optimal balance of quad-channel integration, proven JFET input stability, and industrial temperature range-making it preferred for space-constrained, multi-signal conditioning tasks where consistent input bias and thermal drift matter.
Availability
LF347BN is available at Aetrix Electronics and suitable for motor integrated systems, solar inverters, and pro audio mixers requiring stable component supply across extended production cycles and legacy design refreshes.
Supply support for LF347BN 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 and embedded processing technologies, with decades of experience in high-reliability op-amp design and manufacturing.
The LF347BN belongs to TI's legacy JFET-input op-amp product line, engineered specifically for industrial instrumentation, power electronics feedback, and test equipment where low input bias, high input impedance, and robust thermal performance are essential.
FAQ
What is the maximum operating temperature range for the LF347BN?
The LF347BN is characterized for operation from 0°C to 70°C ambient temperature. This range is specified in the Recommended Operating Conditions table of the official TI datasheet (SLOS013C, Rev. March 2016). Operation outside this range may result in degraded electrical performance or reliability risk, and the device is not tested or guaranteed beyond these limits. For extended temperature applications, consider automotive-qualified alternatives.
Does the LF347BN support single-supply operation?
Yes, the LF347BN supports single-supply operation with a minimum total supply voltage of 3.5 V (e.g., 0 V and +3.5 V). However, its input common-mode range does not extend to the negative rail-it requires at least 4 V above VCC–, so true rail-to-rail input capability is not provided. Output swing remains asymmetric under single-supply conditions, and proper level-shifting or biasing is required for AC-coupled signals.
What is the input offset voltage specification for the LF347BN?
The LF347BN has a typical input offset voltage of 5 mV at 25°C, with a maximum of 13 mV across the full 0°C to 70°C operating range. This value is documented in Section 6.5 (Electrical Characteristics: LF347) of the TI datasheet. The LF347B variant improves this to 3 mV typical (7 mV max), but the LF347BN retains the original LF347 specification set.
How does the LF347BN handle output short circuits?
The LF347BN incorporates internal 200-Ω series output impedance that inherently limits short-circuit current, protecting the output stage without requiring external current-limiting resistors. Under sustained short-circuit conditions, power dissipation must be managed via PCB thermal design, as the device's junction-to-ambient thermal resistance is 42.7°C/W in the PDIP package. Continuous shorts may trigger thermal shutdown in high-ambient environments.
Is the LF347BN pin-compatible with other quad op-amps in PDIP-14 packages?
Yes, the LF347BN uses the industry-standard 14-pin PDIP pinout defined for quad op-amps (e.g., pins 1/7/8/14 = outputs, 2/6/9/13 = inverting inputs, 3/5/10/12 = noninverting inputs, 4/11 = supplies). It is mechanically and electrically pin-compatible with TL074CN, NE5534N (dual), and LM324N (though LM324N is BJT-input with higher bias current). Functional substitution requires verifying gain-bandwidth, slew rate, and input stage compatibility for the target application.
LF347BN 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 FAQ
1.How can I place an order for LF347BN through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347BN 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 reliable?
The price and inventory of LF347BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347BN is usually 5 days.
3.What payment methods are accepted for LF347BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347BN?
LF347BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347BN 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?
For technical support, including LF347BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347BN requirements.
6.How does Aetrix verify that LF347BN is sourced from the original manufacturer or authorized distributors?
All LF347BN 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 meets industry standards.
7.What is the process for return or replacement of LF347BN?
All LF347BN units undergo pre-shipment inspection (PSI). If there is an issue with LF347BN, 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 part is unused and in its original packaging.
Return procedure for LF347BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF347BN 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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