LF444ACN

Overview

The LF444ACN is a quad low-power JFET-input operational amplifier manufactured by Texas Instruments. It offers AC characteristics comparable to the industry-standard LM148 while significantly reducing power consumption. Key electrical parameters include a gain bandwidth product of 1 MHz, a slew rate of 1 V/µs, and a maximum supply current of 200 µA per amplifier. The device supports a wide supply voltage range from 6V to 44V and features a low input bias current of 50 pA (max). It is housed in a 14-pin DIP package.

Feature Summary

• Quad configuration with JFET inputs for high impedance
• Low power consumption compared to standard LM148
• Wide single or dual supply voltage operation

Applications

• General-purpose analog signal processing
• Audio pre-amplification stages
• Active filter circuits

Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance status as per manufacturer documentation. Confirm the 'AC' grade matches required offset voltage and bias current tolerances for the application. Ensure the 14-pin DIP package aligns with PCB footprint requirements. Cross-reference datasheet revisions to confirm pinout consistency with existing designs.

Selection Notes

Select this component when low input bias current and moderate bandwidth are required without excessive power draw. It serves as a direct drop-in replacement for the LM148 in many legacy designs. Consider the 1 MHz gain-bandwidth product for applications requiring faster response than basic audio amplifiers but not exceeding RF speeds. Evaluate thermal dissipation if operating near maximum supply limits.

Part Context

This part belongs to the LF444 series of quad operational amplifiers. It shares architectural similarities with the LF347 but optimizes for lower quiescent current. The family is designed for general-purpose analog applications where JFET input advantages, such as high input impedance, are beneficial over bipolar alternatives.

Replacement Considerations

The LM148 is a functional equivalent with similar pinouts and AC characteristics but higher power consumption. Verify that the replacement meets the specific AC performance requirements of the original design.