Overview
The LF347D, produced by Texas Instruments, is a low-cost, high-speed, JFET-input quad operational amplifier. This device is characterized by its low input bias current, low input noise current, and high slew rate, making it suitable for a variety of high-speed applications. The LF347D features four independent amplifiers integrated on a single monolithic chip, each with matched high-voltage JFET inputs and bipolar output stages. This configuration provides very low input bias and offset currents, along with a large gain-bandwidth product and fast slew rate.
Key Specifications
| Parameter | Typical | Minimum | Maximum | Unit |
|---|---|---|---|---|
| Input Bias Current | 50 pA | 25 pA | 200 pA (at 25°C), 8 nA (at 70°C) | pA |
| Input Offset Current | 25 pA | 25 pA | 100 pA (at 25°C), 4 nA (at 70°C) | pA |
| Input Offset Voltage | 5 mV | - | 10 mV (at 25°C), 13 mV (full range) | mV |
| Supply Current | 8 mA | - | 11 mA | mA |
| Gain Bandwidth | 3 MHz | - | - | MHz |
| Slew Rate | 13 V/μs | 8 V/μs | - | V/μs |
| Operating Temperature Range | - | 0°C | 70°C | °C |
| Package Type | - | - | SOIC (14-pin) | - |
| Body Size (Nominal) | - | - | 8.65 mm × 3.91 mm | mm |
Key Features
- Low input bias current: 50 pA typical
- Low input noise current: 0.01 pA/√Hz typical
- Low total harmonic distortion
- Low supply current: 8 mA typical
- High slew rate: 13 V/μs typical
- High gain-bandwidth product: 3 MHz typical
- Matched high-voltage JFET inputs for low input bias and offset currents
- Bipolar output stages for high output drive capability
- Output protected against shorts due to 200-Ω output impedance
Applications
- Motor integrated systems: UPS, drives, and control solutions
- AC inverters and variable frequency (VF) drives
- Solar inverters and renewable energy systems
- Professional audio mixers
- Oscilloscopes and other high-speed integrators
- Digital-to-analog converters and sample-and-hold circuits
Q & A
- What is the typical input bias current of the LF347D?
The typical input bias current of the LF347D is 50 pA.
- What is the slew rate of the LF347D?
The slew rate of the LF347D is 13 V/μs typical.
- What is the gain-bandwidth product of the LF347D?
The gain-bandwidth product of the LF347D is 3 MHz typical.
- What are the operating temperature ranges for the LF347D?
The operating temperature range for the LF347D is from 0°C to 70°C.
- What types of packages are available for the LF347D?
The LF347D is available in SOIC (14-pin) packages.
- What is the body size of the SOIC package for the LF347D?
The body size of the SOIC package for the LF347D is 8.65 mm × 3.91 mm.
- What are some common applications of the LF347D?
The LF347D is commonly used in motor integrated systems, AC inverters, solar inverters, professional audio mixers, and oscilloscopes.
- How is the output of the LF347D protected?
The output of the LF347D is protected against shorts due to a 200-Ω output impedance.
- What is the supply current of the LF347D?
The supply current of the LF347D is 8 mA typical.
- Can the LF347D be used in single-supply or dual-supply configurations?
Yes, the LF347D can be operated as a single-supply or dual-supply operational amplifier depending on the application.
