LF347N

Overview

The LF347N is a quad JFET-input operational amplifier featuring high slew rates and low input bias currents. It integrates well-matched high-voltage JFET and bipolar transistors in a monolithic IC. Key electrical parameters include a typical slew rate of 16 V/µs, maximum supply voltage of 36 V, and typical input bias current of 200 pA. The device offers wide common-mode voltage range up to VCC+ and internal frequency compensation for stability.

Feature Summary

• JFET input stage providing high input impedance and low bias current
• Internal frequency compensation eliminates external component requirements
• Output short-circuit protection ensures robust operation under fault conditions
• Latch-up free design enhances reliability across operating conditions

Applications

• Professional audio mixing equipment
• Oscilloscope signal conditioning circuits
• Solar inverter control systems
• UPS drive and control applications

Procurement Notes

Verify the manufacturer source carefully as LF347N is produced by multiple vendors including STMicroelectronics, Texas Instruments, and National Semiconductor. Confirm package type matches your PCB footprint, typically 14-pin DIP or SOIC. Ensure the specific suffix aligns with your temperature grade and quality requirements before ordering.

Selection Notes

Select this component when high input impedance and low bias current are critical for signal integrity. It serves as a pin-compatible replacement for MC1741, MC1458, and LM324 families. Choose the LF347B variant if tighter offset voltage specifications are required compared to the standard LF347.

Part Context

This device belongs to the LF34x family of wide bandwidth quad operational amplifiers. It combines JFET input technology with bipolar processing for optimal performance. The series includes single (LF341), dual (LF342), and quad (LF347) configurations sharing similar electrical characteristics and pinouts.

Replacement Considerations

Pin-compatible substitutes include LF347B for improved offset specs, TL074, and NE5532 for different noise profiles. Verify that alternative devices meet the 36V supply and 16V/µs slew rate requirements for direct interchangeability.