BCY59 TIN/LEAD

Overview

The Central Semiconductor Corp BCY59 is a single NPN bipolar junction transistor (BJT) designed for through-hole mounting in the TO-18 metal can package. It features a maximum collector-emitter voltage of 45 V and a continuous collector current rating of 200 mA. The device has a maximum power dissipation of 390 mW and a transition frequency of 200 MHz. DC current gain is specified at a minimum of 180 under standard test conditions. The component operates within a temperature range from -65 °C to +175 °C.

Feature Summary

• Utilizes a hermetically sealed TO-18 metal can construction for robust environmental protection.
• Provides high-frequency performance with a 200 MHz transition frequency suitable for RF applications.
• Offers extended thermal stability with an operating junction temperature up to 175 °C.

Applications

• High-frequency amplification circuits
• Radio frequency signal processing
• General-purpose switching applications

Procurement Notes

Verify the specific manufacturer lot and date code upon receipt, as Central Semiconductor products may be distributed by third-party vendors. Confirm that the tin/lead terminal finish matches the design requirements for soldering processes. Ensure the TO-18 package dimensions align with existing board layouts. Check for any RoHS exemptions if lead-free compliance is mandatory for the final assembly. Validate datasheet parameters against the specific batch documentation provided by the supplier.

Selection Notes

Select this component when a hermetically sealed NPN transistor is required for high-reliability environments. The TO-18 package provides superior thermal conductivity compared to plastic alternatives. Consider the 45 V breakdown voltage and 200 mA current limits to ensure adequate headroom for the intended circuit load. The 200 MHz frequency response makes it suitable for radio frequency stages where smaller packages might lack sufficient power handling or thermal mass.

Part Context

This part belongs to the BCY series of general-purpose NPN transistors manufactured by Central Semiconductor. The BCY59 variant specifically targets applications requiring the durability of a metal can package. It serves as a legacy alternative to modern plastic-packaged equivalents in systems demanding long-term reliability and resistance to harsh physical conditions.

Replacement Considerations

Direct pin-compatible replacements include the STMicroelectronics BCY59X. Verify that substitute parts maintain the same TO-18 footprint and electrical ratings, particularly the 45 V collector-emitter voltage and 200 mA current capacity. Ensure the replacement offers comparable hFE values and transition frequencies to preserve circuit performance.