KSC1393OTA

Overview

The KSC1393OTA is an NPN epitaxial silicon transistor manufactured by Fairchild Semiconductor, now part of onsemi. It operates with a maximum collector current of 20 mA and withstands collector-emitter voltages up to 30 V. The device features a high current gain bandwidth product (fT) of 700 MHz typical and a low noise figure of 3.0 dB maximum at 200 MHz. Power dissipation is rated at 250 mW in a TO-92 package. DC current gain ranges from 40 to 180 depending on the classification bin.

Feature Summary

• High current gain bandwidth product suitable for very high frequency applications
• Low noise figure optimized for sensitive signal amplification
• Low reverse transfer capacitance minimizes feedback effects

Applications

• VHF tuner circuits
• RF amplifier stages
• Forward Automatic Gain Control (AGC) systems

Procurement Notes

Verify manufacturer lineage as Fairchild Semiconductor was acquired by onsemi. Confirm RoHS compliance status through official documentation. Check for obsolete status indicators if sourcing from secondary markets. Ensure the OTA suffix corresponds to the specific tape and reel or bulk packaging configuration required for assembly.

Selection Notes

Select this component for designs requiring high-frequency performance with minimal noise introduction. The 20 mA collector current limit restricts usage in high-power switching applications. Verify that the operating frequency aligns with the 700 MHz fT specification. Consider the TO-92 thermal constraints when determining power dissipation limits in enclosed environments.

Part Context

This transistor belongs to the KSC series of small-signal NPN transistors designed for RF and audio applications. The KSC1393 specifically targets VHF band operations where low capacitance and high gain are critical. It serves as a discrete alternative to integrated RF modules in cost-sensitive consumer electronics and communication hardware.

Replacement Considerations

Public confirmed substitute part numbers: None identified.