LF347BN

Overview

The LF347BN is a quad JFET-input operational amplifier manufactured by Texas Instruments, historically associated with National Semiconductor. It features high slew rates, low input bias and offset currents, and low offset voltage temperature coefficients. The device incorporates well-matched, high-voltage JFET and bipolar transistors in a monolithic integrated circuit. Key electrical specifications include a gain-bandwidth product of 4 MHz, a slew rate of 16 V/µs, an input bias current of 200 pA, and an input offset voltage of 3 mV. It operates on dual supply voltages ranging from ±3.5 V to ±18 V (total 7 V to 36 V) and is available in a 14-pin DIP package.

Feature Summary

• High-speed J-FET input stage providing high input impedance
• Low power consumption with low input bias and offset currents
• Internal frequency compensation for stability
• Output short-circuit protection

Applications

• High-speed integrators
• Digital-to-analog converters
• Sample-and-hold circuits

Procurement Notes

Verify the manufacturer designation carefully, as the LF347 series was originally developed by National Semiconductor and is now produced by Texas Instruments. Confirm that the specific part number suffix matches the required package type and performance grade. Ensure compatibility with existing design specifications regarding pinout and electrical characteristics before procurement.

Selection Notes

Select this component for applications requiring wide bandwidth and fast transient response with low input current. It is suitable for general-purpose analog signal processing where JFET input characteristics are preferred over BJT inputs. Consider the PDIP-14 package constraints for through-hole mounting requirements.

Part Context

The LF347 belongs to the LF34x family of quad operational amplifiers. It shares architectural similarities with single-channel devices like the LF341 and dual-channel variants like the LF342. The 'B' suffix typically denotes a specific performance bin or version within the LF347 lineup, often indicating tighter tolerances or specific manufacturing revisions compared to the standard LF347.

Replacement Considerations

• LF347N
• LF347BD
• LF347DT

FAQ

What is the typical input bias current for the LF347BN?

The typical input bias current is 200 pA.

Does the LF347BN feature internal frequency compensation?

Yes, the device includes internal frequency compensation.