LF412MH

Overview

The LF412MH is a dual operational amplifier manufactured by National Semiconductor, now part of Texas Instruments. It utilizes JFET input technology to achieve low bias currents and high input impedance. The device features internal frequency compensation for stability in unity-gain configurations. Key electrical characteristics include a maximum input offset voltage of 1000 µV and a bandwidth of 4 MHz. It operates within a supply voltage range of ±5 V to ±18 V and is housed in an 8-pin ceramic flatpack package.

Feature Summary

• Dual JFET-input operational amplifiers with low input bias current
• Internally compensated for unity-gain stability
• High slew rate capability for fast signal response
• Wide common-mode and differential voltage ranges

Applications

• Precision integrators and differentiators
• Active filters and audio processing circuits
• Sample-and-hold amplifiers
• Transimpedance amplifiers for photodiode detection

Procurement Notes

Verify the manufacturer origin as National Semiconductor or Texas Instruments. Confirm the MH suffix indicates the military-grade ceramic flatpack variant. Ensure RoHS compliance status aligns with project requirements, noting that older NS parts may not be compliant. Validate pinout compatibility if replacing existing designs.

Selection Notes

Select this component when high input impedance and low bias current are critical. The internal compensation simplifies circuit design by ensuring stability without external components. Consider the ceramic package for harsh environments requiring superior thermal and mechanical performance compared to plastic variants.

Part Context

This device belongs to the LF41x family of dual JFET operational amplifiers. It shares architectural similarities with the LF411 single-channel version but provides two independent amplifiers in one package. The family is known for bridging the gap between general-purpose bipolar op-amps and specialized precision amplifiers.

Replacement Considerations

• LF412CDR
• LM6172
• TL082

FAQ

Is the LF412MH internally compensated?

Yes, the LF412MH includes internal frequency compensation, allowing it to operate stably in unity-gain buffer configurations.

What is the typical input bias current?

The input bias current is typically very low, around 20 pA at 25°C, due to the JFET input stage.