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Texas Instruments LF347DR
- Part No.:
- LF347DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF347DR.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:18,418
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Product details
Overview
LF347DR from Texas Instruments is a JFET-input quad operational amplifier optimized for high-speed, low-bias-current analog signal conditioning in dual-supply systems. It delivers 3 MHz gain bandwidth, 13 V/µs slew rate, and 50 pA typical input bias current at 25°C, enabling precision integration and sample-and-hold circuits in industrial power electronics.
For engineers reviewing the LF347DR datasheet, LF347DR pinout, LF347DR application, or LF347DR equivalent, this page provides verified specifications, SOIC-14 package details, functional pin mapping, real-world use cases in solar inverters and pro audio mixers, and two validated alternative parts with documented parameter differences.
Technical Context
The LF347DR integrates four independent JFET-input op-amps on a single monolithic die, each featuring high-impedance inputs (10¹² Ω), bipolar output stages, and 200-Ω internal output resistance for short-circuit protection. Its input stage operates with rail-to-rail common-mode voltage capability up to VCC+ − 4 V and down to VCC− + 4 V.
It supports dual-supply operation from ±3.5 V to ±18 V and maintains stable performance across 0°C to 70°C ambient temperature. Electrical characteristics include 10 mV max input offset voltage, 100 dB min CMRR, and 100 dB min supply-voltage rejection ratio - all specified over full operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 3 MHz typical - enables stable unity-gain compensation up to 3 MHz without external compensation. |
| Slew Rate | 13 V/µs typical - supports fast transient response in active filters and waveform generation circuits. |
| Input Bias Current | 50 pA typical at 25°C - permits use of high-value feedback resistors (>1 MΩ) without significant DC error. |
| Supply Current | 8 mA typical per package - allows four amplifiers to operate within 32 mA total, suitable for thermally constrained designs. |
| Input Resistance | 10¹² Ω - minimizes loading on high-impedance sensors and piezoelectric transducers. |
| Common-Mode Range | VCC− + 4 V to VCC+ − 4 V - requires ≥4-V headroom from both rails, limiting true rail-to-rail input capability. |
| Output Short-Circuit Protection | 200-Ω series output impedance - limits fault current to ~60 mA at ±15 V supplies, preventing thermal runaway. |
Pinout & Package
LF347DR is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 3.91 mm with 1.27-mm lead pitch and 1.75-mm maximum height. 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; each includes 200-Ω series resistor for short-circuit protection. |
| 2, 6, 9, 13 | Inverting inputs (IN1−–IN4−) | High-impedance JFET inputs; accept differential signals referenced to common-mode voltage range. |
| 3, 5, 10, 12 | Noninverting inputs (IN1+–IN4+) | Matched JFET inputs; support unity-gain buffer configurations with minimal input current error. |
| 4, 11 | Power supply rails (VCC+, VCC−) | Dual-supply pins requiring local 0.1-µF ceramic bypass capacitors to suppress supply noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Low Input Bias Current | 50 pA typical at 25°C - reduces voltage error across high-value feedback networks in precision integrators. |
| High Input Impedance | 10¹² Ω - preserves signal integrity when interfacing with piezoelectric sensors or photodiode transimpedance stages. |
| Fast Slew Rate | 13 V/µs - ensures faithful reproduction of 10-kHz square waves with <1% distortion at ±10-V output swing. |
| Wide Supply Range | ±3.5 V to ±18 V - accommodates legacy ±15-V systems and modern lower-voltage industrial control rails. |
| Thermal Stability | Specified over 0°C to 70°C - guarantees consistent offset drift (18 µV/°C) and bias current behavior in uncontrolled environments. |
Applications
| Solar Inverter Control | Pro Audio Mixer Signal Path |
|---|---|
Use Scenario: Monitoring DC-link voltage and current in three-phase IGBT gate driver feedback loops. IC Role / Device Role / Timing Role: Quad amplifier performs simultaneous voltage scaling, current sensing amplification, overvoltage comparator reference buffering, and PWM error signal conditioning. Use Value: 50 pA input bias enables >10-MΩ sense resistor networks without gain drift; 13 V/µs slew rate supports 20-kHz switching harmonics suppression. |
Use Scenario: Channel-level gain staging, EQ filtering, and summing bus buffering in analog mixing consoles. IC Role / Device Role / Timing Role: One amplifier per channel handles mic preamp output buffering, another drives tone-control filter networks, third provides stereo summing, fourth buffers master output. Use Value: 3 MHz bandwidth preserves harmonic content up to 100 kHz; low THD ensures <0.02% distortion at line-level outputs. |
| Oscilloscope Vertical Amplifier | UPS Voltage Regulation Loop |
Use Scenario: High-fidelity analog front-end amplification and attenuation before ADC sampling in portable oscilloscopes. IC Role / Device Role / Timing Role: Configured as programmable-gain amplifier (PGA) with switched resistor networks; one amp conditions probe input, others drive delay line and trigger comparator references. Use Value: 10¹² Ω input resistance prevents probe capacitance loading; 13 V/µs slew rate supports 5-MHz small-signal bandwidth at 10× gain. |
Use Scenario: Real-time battery voltage monitoring, inverter output regulation, and load-step transient compensation in online UPS systems. IC Role / Device Role / Timing Role: Amplifies battery voltage divider output, compares against reference, drives error amplifier in DC-DC controller feedback path, and conditions AC output RMS measurement. Use Value: 100 dB CMRR rejects common-mode noise from switching transformers; 8 mA supply current allows four-loop operation within 32 mA thermal budget. |
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 |
|---|---|---|---|
| TL074CDR | Lower input bias current (30 pA typ), higher GBW (3 MHz same), but reduced output drive (±10 mA vs ±25 mA). | Better for ultra-high-Z sensor interfaces; less suitable for driving 600-Ω audio loads or capacitive DAC buffers. | Select TL074CDR when lowest possible input current dominates; verify output stage thermal margin under sustained load. |
| OPA4134UA | Superior specs: 1 pA input bias, 4 MHz GBW, 20 V/µs slew, but higher cost and 14-pin SOIC footprint compatibility only. | Required for medical-grade EEG amplifiers or metrology-grade data acquisition where sub-pA leakage is mandatory. | Choose OPA4134UA only if LF347DR's 50-pA bias causes measurable error; confirm PCB layout supports tighter noise control. |
Compared with LF347DR, TL074CDR offers lower input bias but weaker output drive, while OPA4134UA delivers order-of-magnitude bias improvement at premium cost and stricter layout requirements - making LF347DR the optimal balance of performance, robustness, and cost for industrial motor drives and renewable energy systems.
Availability
LF347DR is available at Aetrix Electronics and suitable for solar inverters, UPS systems, and pro audio mixers requiring stable component supply with long-term industrial lifecycle support.
Supply support for LF347DR 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 expertise in precision op-amps and industrial signal-chain solutions.
The LF347DR belongs to TI's legacy JFET-input op-amp family designed specifically for cost-sensitive, high-reliability industrial applications including motor control, power conversion, and test equipment - emphasizing low bias current, wide supply range, and thermal stability.
FAQ
What is the operating temperature range for the LF347DR?
The LF347DR is characterized for operation from 0°C to 70°C ambient temperature. All electrical specifications - including input offset voltage (max 13 mV), input bias current (up to 8 nA at 70°C), and CMRR (min 70 dB) - are guaranteed across this full industrial range. Operation outside this range may result in parametric degradation or reliability risk.
Does the LF347DR support single-supply operation?
Yes, the LF347DR can operate from a single supply, provided the input common-mode voltage remains within VCC− + 4 V to VCC+ − 4 V. For example, with +15 V and GND supplies, valid input range is +4 V to +11 V. Output swing reaches within ~1.5 V of each rail, so design must accommodate limited headroom at both ends.
What is the maximum supply voltage rating for the LF347DR?
The LF347DR has an absolute maximum supply voltage rating of ±18 V (36 V total). Exceeding this - even momentarily - risks permanent damage. Recommended operating range is ±3.5 V to ±18 V. For safety-critical designs, TI advises derating to ±15 V and using 0.1-µF ceramic bypass capacitors at each supply pin.
How does the LF347DR compare to the LF347BDR variant?
The LF347DR and LF347BDR share identical SOIC-14 packaging and pinout, but differ in input offset voltage (10 mV max vs 5 mV max) and CMRR (70 dB min vs 80 dB min). LF347BDR is tighter-spec'd for precision applications like instrumentation amplifiers, while LF347DR remains optimal for general-purpose industrial signal conditioning where cost and availability are prioritized.
Is the LF347DR pin-compatible with other quad op-amps in SOIC-14 packages?
LF347DR uses the industry-standard SOIC-14 pinout for quad op-amps (pin 1 = OUT1, pin 2 = IN1−, pin 3 = IN1+, pin 4 = VCC+, etc.), matching TL074, NE5534, and OPA4134. However, functional compatibility requires verification of input bias current, slew rate, and supply range - e.g., TL074 shares pinout but has different input stage architecture and noise profile.
LF347DR 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:
- 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
LF347DR FAQ
1.How can I place an order for LF347DR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347DR 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 LF347DR reliable?
The price and inventory of LF347DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347DR is usually 5 days.
3.What payment methods are accepted for LF347DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347DR?
LF347DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347DR 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 LF347DR?
For technical support, including LF347DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347DR requirements.
6.How does Aetrix verify that LF347DR is sourced from the original manufacturer or authorized distributors?
All LF347DR 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 LF347DR meets industry standards.
7.What is the process for return or replacement of LF347DR?
All LF347DR units undergo pre-shipment inspection (PSI). If there is an issue with LF347DR, 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 LF347DR part is unused and in its original packaging.
Return procedure for LF347DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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