KSK596BU

Overview

The KSK596BU is an N-channel silicon Junction FET manufactured by onsemi, originally developed by Fairchild Semiconductor. It operates in a depletion mode with a TO-92S three-pin package. Key electrical parameters include a gate-drain breakdown voltage of -20 V and a continuous drain current of 1 mA. The device features a forward transfer admittance ranging from 0.4 to 1.2 mS at 1 MHz. Input capacitance is typically 3.5 pF, while output capacitance is 0.65 pF under standard test conditions.

Feature Summary

• Designed specifically for capacitor microphone applications in audio equipment and telephones
• Provides excellent voltage and transient characteristics suitable for sensitive signal processing
• Utilizes FBET process technology for low output noise performance

Applications

• Audio equipment capacitor microphones
• Telephone capacitor microphones
• Low-noise preamplifier circuits

Procurement Notes

Verify the manufacturer origin carefully, as the component was originally produced by Fairchild Semiconductor before acquisition by onsemi. Confirm the specific IDSS classification (A, B, or C) required for your circuit design, as performance varies significantly between these bins. Ensure the TO-92S package dimensions match your PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when low noise and high linearity are critical for small-signal amplification. The available IDSS classifications allow designers to choose specific gain ranges without external trimming. Consider the maximum power dissipation limit of 100 mW when designing thermal management solutions for enclosed environments.

Part Context

This part belongs to the family of small-signal junction field-effect transistors optimized for audio frequency applications. It serves as a direct replacement for legacy components previously supplied by Fairchild Semiconductor. The device is widely recognized in consumer electronics for its reliability in microphone pre-amplification stages.

Replacement Considerations

Check datasheets for equivalent parts like the 2SK596 series. Verify that substitute components meet the same IDSS binning requirements and maintain identical pinout configurations for the TO-92S package to ensure mechanical compatibility.