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Texas Instruments LF347DRG4
- Part No.:
- LF347DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF347DRG4.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,096
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Product details
Overview
LF347DRG4 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 across ±3.5 V to ±18 V dual supplies within 0°C to 70°C ambient. It is used in solar inverter voltage sensing, UPS feedback loops, and pro audio mixer summing stages.
For engineers reviewing the LF347DRG4 datasheet, LF347DRG4 pinout, LF347DRG4 application, or LF347DRG4 equivalent, key selection criteria include input bias current stability over temperature, common-mode range (VCC– + 4 V to VCC+ – 4 V), output short-circuit protection via 200-Ω series resistance, and SOIC-14 package compatibility with automated SMT assembly.
Technical Context
The LF347DRG4 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 supports both dual-supply (±15 V typical) and single-supply operation, with input common-mode range excluding the negative rail by ≥4 V.
It exhibits 100 dB typical CMRR and PSRR, enabling stable performance in noisy industrial environments. The device's 18 nV/√Hz input voltage noise at 1 kHz and 0.01 pA/√Hz input current noise support precision transimpedance and high-Z sensor interface designs without requiring guard rings or exotic layout techniques.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 3 MHz typical - enables stable closed-loop operation up to ~200 kHz with moderate gain (e.g., G = 15). |
| Slew Rate | 13 V/µs typical - supports clean 10-Vpp output signals up to ~200 kHz without slew-induced distortion. |
| Input Bias Current | 50 pA typical at 25°C - permits use of >1 MΩ feedback resistors without significant DC error accumulation. |
| Input Offset Voltage | 10 mV typical - sets baseline DC error floor in precision DC-coupled amplifiers; trimmed variants (LF347B) reduce this to 5 mV. |
| Supply Voltage Range | ±3.5 V to ±18 V - accommodates legacy ±15 V rails and modern low-voltage industrial systems down to ±3.5 V. |
| Common-Mode Range | VCC– + 4 V to VCC+ – 4 V - requires ≥4-V headroom from either supply rail for valid input operation. |
| Output Short Protection | 200-Ω internal series resistance - limits fault current to <60 mA at ±15 V, eliminating need for external current-limiting resistors. |
Pinout & Package
LF347DRG4 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 max height. The package is RoHS-compliant, tape-and-reel packaged (2500 units/reel), and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | Amplifier outputs (OUT1–OUT4) | Low-impedance buffered outputs with 200-Ω series resistance for short-circuit robustness. |
| 2, 6, 9, 13 | Inverting inputs (IN1– to IN4–) | JFET-gated inputs with 10¹² Ω impedance; sensitive to PCB leakage-requires guarded traces if operating near 50 pA bias limit. |
| 3, 5, 10, 12 | Noninverting inputs (IN1+ to IN4+) | Matched JFET inputs; upper common-mode limit extends to VCC+ – 4 V, enabling rail-to-rail input capability on positive side only. |
| 4, 11 | Power supplies (VCC+, VCC–) | Dual-supply pins; require local 0.1-μF ceramic bypass capacitors placed ≤2 mm from each pin to suppress supply-induced noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Quad JFET-input architecture | Four independent amplifiers share one die, reducing board area and inter-amplifier mismatch vs discrete solutions. |
| Low input noise current | 0.01 pA/√Hz typical - critical for photodiode and piezoelectric sensor interfaces where current noise dominates total error. |
| High input resistance | 10¹² Ω minimum - eliminates loading effects on high-impedance sources such as pH electrodes or capacitive sensors. |
| Thermal stability | 18 µV/°C input offset drift - ensures <100 µV total offset shift across full 0°C–70°C operating range. |
| ESD robustness | ±2000 V HBM rating - withstands standard handling without special ESD precautions beyond basic grounding. |
Applications
| Solar Inverter Voltage Sensing | Pro Audio Mixer Summing |
|---|---|
Use Scenario: Monitoring DC-link voltage in string inverters using high-resistance voltage dividers to scale 1000-V bus to ADC input range. IC Role / Device Role / Timing Role: Precision buffer and level-shifter for isolated feedback path; operates in continuous DC-coupled mode with <10-mV offset error budget. Use Value: 50-pA input bias avoids resistor-divider current error, enabling 1-MΩ top-leg design that minimizes power loss and thermal drift. | Use Scenario: Combining multiple line-level audio channels into a stereo bus with minimal crosstalk and harmonic distortion. IC Role / Device Role / Timing Role: Low-noise, unity-gain summing amplifier per channel; four amplifiers per package handle left/right stereo pairs plus auxiliary sends. Use Value: 13-V/µs slew rate preserves transient fidelity up to 20 kHz; 120-dB crosstalk attenuation prevents bleed between adjacent channels. |
| UPS Feedback Control Loop | Oscilloscope Vertical Amplifier Stage |
Use Scenario: Regulating battery-charging voltage in online UPS systems using isolated current/voltage sensing and PWM controller interface. IC Role / Device Role / Timing Role: Error amplifier in voltage-mode control loop; compares reference with scaled output and drives PWM comparator input. Use Value: 3-MHz GBW supports loop bandwidth >100 kHz for fast load-step response; 100-dB PSRR rejects switching noise from nearby DC/DC converters. | Use Scenario: Amplifying probe signals in 20-MHz-class bench oscilloscopes before ADC sampling, requiring wide dynamic range and low distortion. IC Role / Device Role / Timing Role: High-fidelity gain stage with selectable attenuation; configured as non-inverting amplifier with G = 10 or G = 100. Use Value: 18-nV/√Hz input voltage noise ensures <1-µV RMS noise floor in 10-MHz bandwidth; low THD preserves waveform integrity during repetitive triggering. |
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 for ultra-low-noise audio paths due to 18 nV/√Hz noise matching; less suitable for fast pulse amplification where slew-limited settling matters. | Select TL074CDR when noise spectral density is primary constraint and supply rejection is secondary. |
| LF347DR | Same electrical specs and pinout; differs only in RoHS compliance marking (LF347DRG4 carries TI's legacy "G4" suffix denoting Pb-free NiPdAu finish). | No functional difference; LF347DRG4 is the RoHS-compliant production version replacing LF347DR in new designs. | Choose LF347DRG4 for new designs requiring full RoHS compliance; LF347DR remains viable for legacy repair or non-RoHS markets. |
Compared with TL074CDR, LF347DRG4 offers identical speed and noise but superior common-mode range tolerance near negative rails; versus LF347DR, it provides identical performance with updated environmental compliance-making it the preferred choice for new industrial designs requiring traceable Pb-free sourcing.
Availability
LF347DRG4 is available at Aetrix Electronics and suitable for solar inverters, UPS systems, and pro audio equipment requiring stable component supply across multi-year production cycles.
Supply support for LF347DRG4 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 and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LF347DRG4 belongs to TI's legacy JFET-input op-amp product line, designed specifically for cost-sensitive, high-input-impedance analog signal conditioning in industrial control and test instrumentation.
FAQ
What is the maximum operating temperature range for the LF347DRG4?
The LF347DRG4 is characterized for operation from 0°C to 70°C ambient temperature. Its electrical specifications-including input bias current, offset voltage, and gain bandwidth-are guaranteed only within this range. Operation outside this range may cause parametric degradation or irreversible damage, especially above 150°C junction temperature.
Does the LF347DRG4 support single-supply operation?
Yes, the LF347DRG4 supports single-supply operation. When powered from a single rail (e.g., VCC+ = +15 V, VCC– = 0 V), its input common-mode range extends from +4 V to +11 V, and output swings from ~1.5 V to ~13.5 V with 10-kΩ load. Proper biasing of noninverting inputs is required to maintain linear operation.
What is the purpose of the 200-Ω series resistance in the LF347DRG4 output stage?
The 200-Ω internal series resistance in the LF347DRG4 output stage provides inherent short-circuit protection. During output faults, it limits peak current to approximately 60 mA at ±15 V supply, preventing thermal runaway and eliminating the need for external current-limiting resistors in most industrial applications.
How does the LF347DRG4 compare to the LF347B variant in terms of input offset voltage?
The LF347DRG4 specifies 10 mV typical input offset voltage at 25°C, while the LF347B variant improves this to 5 mV typical. This 2× reduction in VIO makes LF347B preferable in precision DC-coupled applications like strain gauge amplifiers, whereas LF347DRG4 remains optimal for AC-coupled or moderate-accuracy uses where cost and availability are prioritized.
Is the LF347DRG4 pin-compatible with other quad op-amps in SOIC-14 packages?
Yes, the LF347DRG4 uses the industry-standard SOIC-14 pinout defined in JEDEC MS-012 variation AB. It is pin-compatible with TL074, NE5534, and LM324 families for power and signal terminals-though functional differences (e.g., JFET vs bipolar input, dual vs single supply) require circuit validation before substitution.
LF347DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LF347DRG4 FAQ
1.How can I place an order for LF347DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347DRG4 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 LF347DRG4 reliable?
The price and inventory of LF347DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347DRG4 is usually 5 days.
3.What payment methods are accepted for LF347DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347DRG4?
LF347DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347DRG4 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 LF347DRG4?
For technical support, including LF347DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347DRG4 requirements.
6.How does Aetrix verify that LF347DRG4 is sourced from the original manufacturer or authorized distributors?
All LF347DRG4 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 LF347DRG4 meets industry standards.
7.What is the process for return or replacement of LF347DRG4?
All LF347DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LF347DRG4, 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 LF347DRG4 part is unused and in its original packaging.
Return procedure for LF347DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF347DRG4 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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