KSC1730YTA

Overview

The KSC1730YTA is an NPN silicon epitaxial planar transistor manufactured by Fairchild Semiconductor, housed in a TO-92 plastic package. It features a maximum collector-emitter voltage (VCEO) of 50 V and a continuous collector current (IC) rating of 0.1 A. The device has a maximum power dissipation of 0.625 W at 25°C ambient temperature. Minimum DC current gain (hFE) values are specified as 100 for the 'Y' grade and 70 for the 'A' grade. Key switching parameters include a turn-on time of 1 µs and a storage time of 3 µs when driven with a base current of 5 mA.

Feature Summary

• Utilizes epitaxial planar technology for stable performance and high reliability.
• Designed specifically for general-purpose amplifier and high-speed switching applications.
• Offers defined hFE binning to ensure consistent amplification characteristics across production batches.

Applications

• General-purpose low-power amplification circuits
• High-speed switching logic interfaces
• Driver stages for relay or LED control

Procurement Notes

Verify the specific suffix code on the component marking to confirm the exact hFE binning grade (e.g., Y vs. A). Ensure the procurement source provides original manufacturer documentation or authorized distributor certificates to validate authenticity against counterfeits. Confirm RoHS compliance status if required for specific regulatory environments.

Selection Notes

Select this component when a small-signal NPN transistor with moderate voltage handling (50 V) and low current capacity (100 mA) is required. Compare the minimum hFE requirements of the target circuit against the specific suffix grades available. Consider thermal management constraints, as the TO-92 package limits total power dissipation to 0.625 W without significant heatsinking.

Part Context

This part belongs to the KSC series of NPN transistors produced by Fairchild Semiconductor, now part of ON Semiconductor. The TO-92 packaging is standard for through-hole mounting in consumer electronics and industrial control boards. The 'YTA' suffix typically denotes the specific gain binning and tape-and-reel or bulk packaging configuration used by the manufacturer.

Replacement Considerations

Direct substitutes include the 2N3904 or BC547B, provided the pinout compatibility (Emitter-Base-Collector vs. Base-Collector-Emitter) is verified. Alternative equivalents such as the S8050 or C1815 may be considered for similar voltage and current ratings, though their switching speeds and gain distributions should be cross-referenced with the design requirements.