KSA1242YTU

Single Bipolar Transistors Overview

The KSA1242YTU is a PNP epitaxial planar silicon transistor manufactured by Fairchild Semiconductor, now part of onsemi. It is housed in a TO-251-3 (SOT-143) surface-mount package designed for through-hole compatibility or board mounting. The device features a maximum collector current of 0.8 A and a collector-emitter voltage rating of 30 V. Key electrical characteristics include a DC current gain (hFE) ranging from 70 to 240 and a transition frequency of 100 MHz. It operates within a temperature range of -55°C to +150°C with a power dissipation capability of 1 W.

Single Bipolar Transistors Feature Summary

• PNP polarity configuration for complementary circuit designs
• High-frequency performance suitable for audio and RF applications
• Robust thermal stability with extended operating temperature range

Single Bipolar Transistors Applications

• Audio frequency power amplifier stages
• High-frequency power amplifier circuits
• General-purpose switching applications

Single Bipolar Transistors Procurement Notes

Verify the manufacturer status as Fairchild Semiconductor was acquired by onsemi. Confirm the specific suffix YTU corresponds to the TO-251-3 tape-and-reel packaging format. Check for RoHS compliance documentation and ensure the component meets current automotive or industrial qualification standards if required for the design.

Single Bipolar Transistors Selection Notes

Select this component for low-voltage, medium-current PNP switching or amplification tasks. Compare against NPN counterparts like the KSC series for complementary pairs. Ensure the TO-251-3 footprint matches the PCB layout. Verify that the 30 V voltage rating provides sufficient headroom for the target supply voltage.

Single Bipolar Transistors Part Context

This transistor belongs to the KSA/KSC series of general-purpose bipolar junction transistors widely used in consumer electronics and industrial control systems. The KSA prefix denotes PNP polarity, while the KSC prefix indicates NPN. These components are standard replacements in legacy designs requiring small-signal to medium-power handling capabilities.

Single Bipolar Transistors Replacement Considerations

Direct substitutes may include the KSA1243 or KSA1244 from the same family. Cross-reference with equivalent parts from other manufacturers such as ON Semiconductor or Diodes Inc. ensuring identical pinout and electrical ratings.