LF147J

Overview

The LF147J is a quad JFET-input operational amplifier manufactured by Texas Instruments. It features a gain-bandwidth product of 4 MHz and a slew rate of 13 V/us. The device operates within a supply voltage range of 5 V to 44 V, with a maximum dual supply of 22 V. Key electrical parameters include an input bias current of 200 pA, an input offset voltage of 5 mV, and a common-mode rejection ratio of 100 dB. It draws 7.2 mA of operating current and provides 30 mA output current per channel. The component utilizes a CDIP-14 package for through-hole mounting.

Feature Summary

• Quad JFET input architecture providing low input bias current
• Wide bandwidth capability suitable for high-speed applications
• High common-mode rejection ratio for signal integrity

Applications

• High-speed integrators
• Sample-and-hold circuits
• Data acquisition systems

Procurement Notes

Verify the specific suffix 'J' indicates the ceramic DIP package variant when sourcing. Confirm RoHS compliance status as indicated in supplier specifications, noting that some legacy variants may not meet current environmental standards. Ensure the supplier documentation explicitly lists the LF147J part number to avoid confusion with plastic package equivalents like the LF147N or LF347 series.

Selection Notes

Select this component when low input bias current and wide bandwidth are required in a quad configuration. The JFET input stage offers advantages over bipolar inputs regarding noise and bias stability. Compare against the LF347 if lower cost or surface-mount options are needed, though performance characteristics differ slightly. Verify thermal requirements for the CDIP-14 package in enclosed designs.

Part Context

The LF147J belongs to the LF147 family of wide bandwidth quad operational amplifiers. This series is designed for applications requiring high speed and low power consumption. The 'J' suffix typically denotes the military-grade or specific ceramic package version offered by Texas Instruments, distinguishing it from commercial plastic packages.

Replacement Considerations

The LF147N serves as a plastic package alternative within the same functional family. For surface-mount requirements, the LF147M or LF347 variants may be considered, though pinouts and exact electrical specs should be verified against the datasheet.