LF442AMH

Overview

The LF442AMH is a dual low power JFET input operational amplifier manufactured by Texas Instruments. It features a TO-99 metal can package with 8 pins and operates within a temperature range of -55°C to 125°C. Key electrical specifications include a maximum supply current of 400 µA, a maximum input bias current of 50 pA at 25°C, and a maximum input offset voltage of 1 mV. The device provides a gain-bandwidth product of 1 MHz and a slew rate of 1 V/µs.

Feature Summary

• Utilizes well-matched high voltage JFET input devices to achieve extremely low input bias and offset currents.
• Incorporates internal trimming and careful layout design to ensure very low input offset voltage and minimal voltage drift.
• Delivers AC performance comparable to standard bipolar amplifiers while significantly reducing power consumption.

Applications

• High speed integrators
• Fast D/A converters
• Sample and hold circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature rating. Ensure the component meets all required military or commercial specifications for the intended environment. Cross-reference the datasheet revision history to validate that the technical parameters align with the production batch requirements.

Selection Notes

Select this component when low power dissipation and good electrical characteristics are primary considerations. It serves as a pin-compatible replacement for the LM1458, offering a significant reduction in power drain without sacrificing bandwidth or slew rate. Ideal for applications requiring high input impedance and low noise in a low power environment.

Part Context

This device belongs to the LF442-MIL family of dual low power operational amplifiers. It is designed to provide many of the same AC characteristics as the industry standard LM1458 while greatly improving DC characteristics. The LF442-MIL is pin compatible with the LM1458, allowing for immediate power savings in existing designs.

Replacement Considerations

The LF442-MIL is explicitly stated to be pin compatible with the LM1458. This allows for direct substitution in many applications to achieve a tenfold reduction in power drain while maintaining similar AC performance metrics such as bandwidth and slew rate.

FAQ

How does the LF442AMH compare to the LM1458 in terms of power consumption?

The LF442AMH draws only one-tenth the supply current of the LM1458, providing a significant reduction in power dissipation while maintaining similar AC characteristics.

What type of input devices are used in the LF442AMH?

The LF442AMH uses well-matched high voltage JFET input devices, which reduce input bias and offset currents by a factor of 10,000 compared to the LM1458.