BCY78-X PBFREE

Overview

The BCY78-X PBFREE is a silicon PNP epitaxial planar transistor manufactured by Central Semiconductor Corp. It features a hermetically sealed metal TO-18 package designed for low-frequency applications. Key electrical parameters include a collector-base voltage (VCBO) of 32 V, an emitter-base voltage (VEBO) of 5 V, and a continuous collector current of 100 mA. The device offers a gain bandwidth product (fT) of 100 MHz and power dissipation capabilities up to 1 W in the through-hole configuration. Operating temperatures range from -65°C to +200°C.

Feature Summary

• Hermetically sealed metal case construction
• Silicon PNP epitaxial planar technology
• Through-hole TO-18 mounting style

Applications

• Low-frequency switching circuits
• Amplifier stages requiring high reliability
• Military and aerospace electronic systems

Procurement Notes

Verify the specific ordering suffix when purchasing. The 'PBFREE' designation indicates lead-free plating, while other variants may use tin/lead finishes. Confirm that the required package type matches the application's thermal and mechanical constraints. Ensure the component meets the necessary environmental specifications for the intended operating temperature range.

Selection Notes

Select this component for applications requiring a rugged, hermetically sealed PNP transistor with moderate voltage ratings. The TO-18 package provides robust physical protection suitable for harsh environments. Consider the 100 mA current limit and 32 V voltage rating when designing the circuit load. Verify compatibility with existing board layouts for the through-hole footprint.

Part Context

This part belongs to the BCY78/BCY79 series of silicon PNP transistors produced by Central Semiconductor Corp. These devices are engineered for durability and consistent performance in demanding conditions. The series utilizes epitaxial planar technology to ensure stable electrical characteristics across varying temperatures.

Replacement Considerations

Direct substitutes may include the BCY79 series variants, though electrical parameters such as hFE and voltage ratings should be compared carefully. Other generic PNP transistors in the TO-18 package can serve as alternatives if pinout and maximum ratings align with the original design requirements.