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Texas Instruments LF347D
- Part No.:
- LF347D
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF347D.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,638
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Product details
Overview
LF347D from Texas Instruments is a JFET-input quad operational amplifier optimized for high-speed, low-bias-current analog signal conditioning in industrial and test equipment. It delivers 3 MHz gain bandwidth, 13 V/µs slew rate, 50 pA typical input bias current, and operates from ±3.5 V to ±18 V dual supplies across 0°C to 70°C. It is used in solar inverter feedback loops, oscilloscope vertical amplifiers, and UPS motor control integrators.
For engineers reviewing the LF347D datasheet, LF347D pinout, LF347D application, or LF347D equivalent, key selection criteria include input bias current stability over temperature, common-mode voltage range (VCC– + 4 V to VCC+ – 4 V), output short-circuit protection via 200-Ω series resistance, and SOIC-14 package compatibility with standard 1.27-mm pitch PCB layouts.
Technical Context
The LF347D integrates four independent JFET-input op-amps on a single monolithic die, each featuring high-impedance inputs (10¹² Ω) and bipolar output stages. Its architecture enables stable operation with capacitive loads up to 100 pF while maintaining 120 dB crosstalk attenuation at 1 kHz between adjacent amplifiers.
It supports both dual-supply (±3.5 V to ±18 V) and single-supply configurations, with input common-mode range extending to within 4 V of either rail and output swing reaching ±13.5 V into 10-kΩ loads. Thermal performance is characterized by RθJA = 74.4°C/W in SOIC-14 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 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 conditioning 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 precision integrators. |
| Supply Current | 8 mA typical - balances speed and power efficiency for multi-amplifier systems requiring low thermal load. |
| Common-Mode Range | VCC– + 4 V to VCC+ – 4 V - defines usable input voltage window; excludes rails, requiring level-shifting for rail-to-rail input signals. |
| Output Short Protection | 200-Ω series impedance - limits fault current during output shorts, enabling robust operation in motor drive interface circuits. |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements without additional external protection circuitry. |
Pinout & Package
LF347D is housed in a 14-pin SOIC (D) package with nominal body dimensions 8.65 mm × 3.91 mm and 1.27-mm lead pitch. The package is RoHS-compliant, moisture sensitivity level 1, and rated for reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | Amplifier outputs (OUT1–OUT4) | Low-impedance buffered outputs with internal 200-Ω series resistance for short-circuit protection. |
| 2, 6, 9, 13 | Inverting inputs (IN1– to IN4–) | JFET-gate inputs with 10¹² Ω impedance; sensitive to layout-induced leakage and ESD. |
| 3, 5, 10, 12 | Noninverting inputs (IN1+ to IN4+) | Matched JFET inputs; common-mode range extends to within 4 V of supply rails. |
| 4, 11 | Power supplies (VCC+, VCC–) | Dual-supply pins requiring local 0.1-µF ceramic bypass capacitors placed ≤2 mm from each pin. |
Key Features
| Feature | Design Value |
|---|---|
| Quad JFET-input architecture | Four independent amplifiers sharing one substrate; enables compact multi-channel signal conditioning without inter-device matching drift. |
| Low input noise current | 0.01 pA/√Hz typical - minimizes current-noise-induced errors in high-source-impedance transducer interfaces (e.g., piezoelectric sensors). |
| High CMRR & PSRR | 70 dB minimum CMRR and kSVR - rejects power supply ripple and common-mode interference in noisy industrial environments. |
| Thermal stability | 18 µV/°C input offset drift - ensures consistent DC accuracy across 0°C to 70°C operating range without recalibration. |
| Unity-gain stable | No external compensation required - simplifies design of inverting/noninverting amplifiers, active filters, and voltage followers. |
Applications
| Solar Inverter Feedback Control | Oscilloscope Vertical Amplifier |
|---|---|
Use Scenario: Monitoring DC-link voltage and AC output current in grid-tied photovoltaic inverters for closed-loop PWM regulation. IC Role / Device Role / Timing Role: Quad amplifier performs simultaneous differential sensing, isolation buffer, and signal conditioning before ADC sampling. Use Value: 50 pA input bias current prevents measurement drift in high-resistance shunt-based current sensing networks. |
Use Scenario: Amplifying and shaping fast-rising edge signals in the vertical deflection path of analog oscilloscopes. IC Role / Device Role / Timing Role: First-stage gain block with 3 MHz bandwidth and 13 V/µs slew rate preserves signal fidelity up to 100 kHz. Use Value: Low total harmonic distortion ensures minimal waveform distortion during high-fidelity time-domain analysis. |
| UPS Motor Drive Integrator | Pro Audio Mixer Channel |
Use Scenario: Implementing analog PI controllers in uninterruptible power supply motor drives for voltage regulation and phase synchronization. IC Role / Device Role / Timing Role: Integrator stage using LF347D's low input bias current to maintain stable integration over long time constants (≥1 s). Use Value: Input offset voltage ≤10 mV and 18 µV/°C drift ensure stable DC operating point under thermal cycling. |
Use Scenario: Channel-level gain staging, tone control, and summing in professional analog audio mixing consoles. IC Role / Device Role / Timing Role: High-slew-rate amplifier driving low-impedance loads (600 Ω) while maintaining low THD across 20 Hz–20 kHz. Use Value: 13 V/µs slew rate prevents slew-induced distortion on transient-rich program material (e.g., drum transients). |
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 |
|---|---|---|---|
| TL074CDR | Lower input bias current (30 pA typ), higher GBW (3 MHz same), but lower slew rate (13 V/µs same); identical SOIC-14 package. | Preferred in low-noise audio paths due to lower voltage noise (18 nV/√Hz vs. LF347D's 25 nV/√Hz), but less robust in high-common-mode industrial settings. | Select TL074CDR when voltage noise dominates system SNR budget; verify common-mode rejection at full operating temperature range. |
| LF353DR | Dual-channel version (not quad); same JFET input structure, 4 MHz GBW, 12 V/µs slew rate, and 50 pA IIB; SOIC-8 package. | Used where board space is constrained and only two amplifiers per IC are needed-requires two devices for quad functionality. | Choose LF353DR for space-constrained dual-amplifier designs; avoid for direct LF347D replacement unless redesigning channel count and layout. |
Compared with TL074CDR and LF353DR, the LF347D provides optimal balance of input bias current, slew rate, and thermal stability for industrial motor control and power conversion where long-term DC accuracy and robustness outweigh ultra-low-noise requirements.
Availability
LF347D is available at Aetrix Electronics and suitable for solar inverter feedback control, oscilloscope vertical amplification, and UPS motor drive integrator circuits requiring stable component supply across extended production lifecycles.
Supply support for LF347D 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 heritage in precision op-amp design and manufacturing.
The LF347D belongs to TI's legacy JFET-input op-amp product line, engineered specifically for industrial instrumentation, power electronics, and test equipment demanding low input bias current, wide supply range, and proven reliability over temperature.
FAQ
What is the maximum operating temperature range for the LF347D?
The LF347D is characterized for operation from 0°C to 70°C ambient temperature. This range is specified in the Recommended Operating Conditions table and applies to all electrical parameters including input offset voltage, bias current, and slew rate. Operation outside this range may result in parametric degradation or reliability risk, and is not guaranteed by Texas Instruments' production data sheet.
Does the LF347D support single-supply operation?
Yes, the LF347D supports single-supply operation with appropriate biasing. Its input common-mode range extends from VCC– + 4 V to VCC+ – 4 V, so with a single +15 V supply and VCC– tied to ground, valid input voltages span 4 V to 11 V. Output swing reaches ±13.5 V into 10-kΩ loads under dual supply; under single supply, it swings from ~2 V to ~13 V depending on load and quiescent current.
What is the purpose of the 200-Ω output resistance in the LF347D?
The 200-Ω output resistance in the LF347D is an intentional series impedance integrated into each amplifier's output stage to provide short-circuit protection. It limits peak fault current during output-to-ground or output-to-rail shorts, preventing thermal runaway and enabling safe recovery after fault removal without external current-limiting components.
How does the LF347D compare to the LF347B variant?
The LF347B offers tighter input offset voltage (3 mV max vs. 5 mV max for LF347D at 25°C) and improved CMRR (80 dB min vs. 70 dB min), but shares identical pinout, package, slew rate, gain bandwidth, and input bias current. The LF347D remains suitable for cost-sensitive industrial applications where ±10 mV offset is acceptable, while LF347B targets higher-precision implementations.
Is the LF347D pin-compatible with other quad op-amps like the LM324?
No, the LF347D is not pin-compatible with the LM324. While both are quad op-amps in SOIC-14 packages, the LF347D uses JFET inputs with different pin assignments: its VCC+ is pin 4 and VCC– is pin 11, whereas the LM324 uses pin 4 for VCC– and pin 11 for VCC+. Swapping them without board revision will cause catastrophic supply reversal and device failure.
LF347D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 13V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 8mA (x4 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LF347D FAQ
1.How can I place an order for LF347D through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347D 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 LF347D reliable?
The price and inventory of LF347D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347D is usually 5 days.
3.What payment methods are accepted for LF347D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347D?
LF347D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347D 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 LF347D?
For technical support, including LF347D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347D requirements.
6.How does Aetrix verify that LF347D is sourced from the original manufacturer or authorized distributors?
All LF347D 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 LF347D meets industry standards.
7.What is the process for return or replacement of LF347D?
All LF347D units undergo pre-shipment inspection (PSI). If there is an issue with LF347D, 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 LF347D part is unused and in its original packaging.
Return procedure for LF347D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF347D Tags
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LM358DT
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LM358DR
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LM2904DR
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LM358ADR
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LM2904DGKR
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
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LM324PWR
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LM2902DR
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LM358P
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