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Texas Instruments LF347BD
- Part No.:
- LF347BD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF347BD.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:819
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Product details
Overview
LF347BD from Texas Instruments is a JFET-input quad operational amplifier optimized for high-speed, low-bias-current applications including integrators, sample-and-hold circuits, and DAC output buffers. It delivers 3 MHz gain bandwidth, 13 V/μs slew rate, 50 pA typical input bias current, and operates over 0°C to 70°C with ±3.5 V to ±18 V dual-supply capability.
For engineers reviewing the LF347BD datasheet, LF347BD pinout, LF347BD application, or LF347BD equivalent, key selection considerations include its JFET-input architecture enabling high-impedance signal conditioning, rail-to-rail common-mode input range (excluding negative rail), and 200-Ω output resistance for short-circuit protection in industrial analog front-ends.
Technical Context
The LF347BD integrates four independent JFET-input op-amps on a single monolithic die, each featuring high-input impedance (>10¹² Ω), low-noise current (0.01 pA/√Hz), and bipolar output stages. Its architecture supports both single- and dual-supply operation with common-mode input voltage ranging from VCC– + 4 V to VCC+ – 4 V.
It exhibits 80 dB minimum CMRR and 80 dB minimum supply-voltage rejection ratio at 25°C, with unity-gain stable operation and 120 dB crosstalk attenuation between channels at 1 kHz - critical for multi-channel precision signal routing in motor control and test equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 3 MHz typical - enables stable closed-loop operation up to ~300 kHz with moderate gain in active filters and instrumentation amplifiers. |
| Slew Rate | 13 V/μs typical - supports fast transient response in pulse amplification and waveform generation without distortion. |
| Input Bias Current | 50 pA typical at 25°C - permits use of >1 MΩ feedback resistors without significant DC error in high-impedance sensor interfaces. |
| Input Offset Voltage | 3–5 mV typical (LF347B grade) - defines baseline DC error in precision DC-coupled gain stages requiring post-calibration. |
| Supply Voltage Range | ±3.5 V to ±18 V - accommodates wide dynamic range in industrial power supplies and legacy ±12 V or ±15 V systems. |
| Output Short-Circuit Protection | 200 Ω series output resistance - limits fault current to ~75 mA at ±15 V, enabling robust operation in motor drive feedback loops. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems, audio mixers, and UPS monitoring circuits. |
Pinout & Package
LF347BD 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 with NIPDAU lead finish and Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | Amplifier outputs (OUT1–OUT4) | Low-impedance buffered outputs capable of driving ≥10 kΩ loads; internally limited to ~75 mA during shorts. |
| 2, 6, 9, 13 | Inverting inputs (IN1–IN4–) | High-impedance JFET nodes; require matched trace layout to minimize offset drift in differential configurations. |
| 3, 5, 10, 12 | Noninverting inputs (IN1–IN4+) | Support common-mode voltages up to VCC+ – 4 V; lower limit is VCC– + 4 V - not rail-to-rail on negative side. |
| 4, 11 | Power rails (VCC+, VCC–) | Dual-supply pins requiring local 0.1 μF ceramic bypass capacitors placed ≤2 mm from each pin to suppress PSRR degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Quad JFET-input architecture | Four independent amplifiers sharing one die - reduces board space and inter-channel thermal drift vs discrete solutions. |
| Low input noise current | 0.01 pA/√Hz typical - preserves SNR in photodiode transimpedance amplifiers and piezoelectric sensor interfaces. |
| High CMRR & PSRR | ≥80 dB at 25°C - rejects power supply ripple and common-mode interference in noisy industrial environments. |
| Unity-gain stability | Guaranteed stable with capacitive loads ≤100 pF - simplifies compensation in voltage follower and buffer designs. |
| ESD protection | ±2000 V HBM, ±1000 V CDM - meets standard handling requirements for automated assembly without special ESD controls. |
Applications
| Motor Control Feedback | Solar Inverter Signal Conditioning |
|---|---|
Use Scenario: Monitoring phase currents and DC-link voltage in three-phase AC inverters for variable-frequency drives. IC Role / Device Role / Timing Role: Quad op-amp performs simultaneous current sensing (2 channels), voltage scaling (1 channel), and reference buffering (1 channel). Use Value: Low input bias current prevents gain error in high-resistance shunt-based current sensing; 13 V/μs slew rate captures fast switching transients. |
Use Scenario: Amplifying and filtering MPPT controller signals and isolated DC bus measurements in photovoltaic string inverters. IC Role / Device Role / Timing Role: Configured as precision difference amplifier and anti-aliasing filter stage before ADC sampling. Use Value: 3 MHz bandwidth supports accurate harmonic analysis up to 50th order; 80 dB CMRR rejects common-mode noise from high-dV/dt switching nodes. |
| Oscilloscope Vertical Amplifier | Pro Audio Mixer Channel Strip |
Use Scenario: Signal amplification and offset adjustment in analog vertical deflection circuitry of benchtop oscilloscopes. IC Role / Device Role / Timing Role: One amplifier per channel provides programmable gain and DC offset correction before CRT driver stage. Use Value: 120 dB inter-channel crosstalk ensures channel isolation during dual-trace operation; 5 mV offset enables sub-mV/div sensitivity calibration. |
Use Scenario: Pre-amplification, EQ filtering, and summing in analog channel strips of professional audio mixing consoles. IC Role / Device Role / Timing Role: Four amplifiers handle mic preamp gain, high-pass filter, parametric EQ section, and line-level summing node. Use Value: Low THD preserves audio fidelity; JFET inputs prevent loading of passive tone-control networks with high-Z potentiometers. |
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 | Higher slew rate (13 V/μs same), lower input bias current (65 pA typical), but narrower common-mode range (VCC– + 4 V only). | Better for audio due to lower noise voltage (18 nV/√Hz), less suitable for high-common-mode industrial sensing. | Select TL074CDR when prioritizing audio SNR and lower cost; verify VCM compliance for high-side sensing. |
| OPA4134UA | Superior specs: 0.8 µV/°C offset drift, 100 kHz GBW, rail-to-rail output - but higher supply current (4 mA per amp) and cost. | Targeted at high-fidelity audio and precision instrumentation where LF347BD's 3 MHz bandwidth is excessive. | Choose OPA4134UA only if required by system-level accuracy or thermal drift specs; not drop-in compatible due to different pinout. |
Compared with TL074CDR and OPA4134UA, the LF347BD offers balanced performance for cost-sensitive industrial analog signal chains where JFET input impedance and moderate speed outweigh ultra-low noise or rail-to-rail output needs.
Availability
LF347BD is available at Aetrix Electronics and suitable for motor integrated systems, solar inverters, and pro audio mixers requiring stable component supply across extended production lifecycles.
Supply support for LF347BD 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-amp design and manufacturing.
The LF347BD belongs to TI's legacy JFET-input op-amp family engineered for industrial and instrumentation applications demanding low input bias current, high speed, and robustness in non-automotive commercial environments.
FAQ
What is the operating temperature range for the LF347BD?
The LF347BD is characterized for operation from 0°C to 70°C, making it suitable for commercial-grade industrial equipment, UPS systems, and audio products deployed in controlled ambient environments. It is not rated for extended temperature ranges such as –40°C to 125°C, and thermal derating above 70°C is not specified in the datasheet.
Does the LF347BD support single-supply operation?
Yes, the LF347BD supports single-supply operation when biased appropriately - for example, with VCC+ = +15 V and VCC– = 0 V. However, its input common-mode range extends only from 4 V above the negative rail to 4 V below the positive rail, so input signals must stay within that window. Output swing is similarly limited to ±12 V into 10 kΩ under dual-supply conditions.
What is the significance of the 'B' suffix in LF347BD?
The 'B' in LF347BD denotes the improved grade of the LF347 family, featuring tighter specifications: lower input offset voltage (3–5 mV typical vs. 5–10 mV for LF347D), higher CMRR (≥80 dB vs. ≥70 dB), and better supply-voltage rejection ratio (≥80 dB vs. ≥70 dB). This makes LF347BD preferable for precision analog signal paths where DC accuracy matters.
Can the LF347BD drive capacitive loads directly?
The LF347BD is unity-gain stable with capacitive loads up to 100 pF, as confirmed in the datasheet's switching characteristics section. Driving larger capacitive loads (e.g., long cables or ADC input capacitance >100 pF) requires external isolation resistors or compensation networks to prevent peaking or oscillation - the internal 200-Ω output resistance helps dampen but does not eliminate instability risks.
Is the LF347BD pin-compatible with other quad op-amps like LM324?
No, the LF347BD is not pin-compatible with LM324. While both are 14-pin quad op-amps, the LF347BD uses a JFET-input architecture with dual-supply-centric pinout (VCC+ on pin 4, VCC– on pin 11), whereas LM324 is bipolar-input and single-supply oriented (VCC on pin 4, GND on pin 11). Swapping them requires PCB redesign and bias network changes.
LF347BD 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:
- 3 mV
- Current - Supply:
- 8mA (x4 Channels)
- Current - Output / Channel:
- 31 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
LF347BD FAQ
1.How can I place an order for LF347BD through Aetrix?
Please submit a Request for Quotation (RFQ) for LF347BD 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 LF347BD reliable?
The price and inventory of LF347BD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF347BD is usually 5 days.
3.What payment methods are accepted for LF347BD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF347BD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF347BD?
LF347BD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF347BD 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 LF347BD?
For technical support, including LF347BD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF347BD requirements.
6.How does Aetrix verify that LF347BD is sourced from the original manufacturer or authorized distributors?
All LF347BD 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 LF347BD meets industry standards.
7.What is the process for return or replacement of LF347BD?
All LF347BD units undergo pre-shipment inspection (PSI). If there is an issue with LF347BD, 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 LF347BD part is unused and in its original packaging.
Return procedure for LF347BD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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