KF347

Overview

The KF347 is a quad JFET input operational amplifier housed in a 14-pin DIP package. It features a typical gain bandwidth product of 4 MHz and a slew rate of 13 V/µs. The device operates with supply voltages up to ±18 V and an operating temperature range of 0°C to +70°C. Key electrical characteristics include a maximum input offset voltage of 10 mV, input bias current of 200 pA, and input resistance of 10^12 Ω.

Feature Summary

• Quad JFET input architecture providing high input impedance
• High slew rate and wide gain bandwidth for speed applications
• Low input bias current and low input offset voltage

Applications

• Circuits requiring high input impedance
• General-purpose analog signal processing
• Precision instrumentation amplifiers

Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor or onsemi, noting that onsemi acquired Fairchild's semiconductor business. Confirm the package type is 14-DIP and the operating temperature range is commercial (0°C to +70°C). Ensure the datasheet revision matches the required specifications, particularly regarding absolute maximum ratings and electrical characteristics at 25°C.

Selection Notes

Select this component when a quad configuration with JFET inputs is necessary for high impedance buffering or signal conditioning. The 14-DIP package facilitates through-hole prototyping. Consider the ±18 V supply capability and the specific noise and drift parameters if precision is required over the full commercial temperature range.

Part Context

The KF347 belongs to the family of quad operational amplifiers utilizing JFET input stages. This topology is distinct from bipolar input op-amps due to its significantly higher input impedance and lower bias current. It serves as a general-purpose solution for multi-channel analog applications where moderate speed and precision are balanced.

Replacement Considerations

Public confirmed substitute part numbers: LF347.