2N2857 PBFREE

Overview

The Central Semiconductor Corp 2N2857 PBFREE is an NPN silicon RF transistor housed in a TO-72 case. It is designed for VHF/UHF amplifier, oscillator, and converter applications. Key electrical parameters include a collector-base voltage of 30V, collector-emitter voltage of 15V, and continuous collector current of 40mA. Power dissipation is rated at 200mW (ambient) and 300mW (case). The transition frequency reaches up to 1.9GHz, with a maximum power output of 30mW at 500MHz.

Feature Summary

• Engineered specifically for high-frequency VHF and UHF circuit implementations
• Utilizes a hermetically sealed TO-72 metal package for reliable performance
• Features low noise figure characteristics suitable for sensitive signal processing

Applications

• VHF and UHF amplifier circuits
• Oscillator designs
• Frequency converter stages

Procurement Notes

Verify the specific plating configuration required for the application. The datasheet indicates that adding the suffix TIN/LEAD requests tin/lead plated devices, while PBFREE denotes lead-free plating. Confirm availability directly with the manufacturer or authorized distributors as standard stock levels may vary. Ensure the ordering documentation explicitly states the desired termination finish to match assembly requirements.

Selection Notes

Select this component when designing circuits requiring NPN silicon transistors for VHF/UHF frequencies. Consider the 15V collector-emitter voltage limit and 40mA continuous current rating during biasing calculations. The TO-72 package requires appropriate mounting considerations for thermal management, especially if operating near the 300mW case dissipation limit. Verify compatibility with existing PCB layouts or chassis cutouts designed for TO-72 footprints.

Part Context

This device belongs to the family of NPN silicon RF transistors manufactured by Central Semiconductor Corp. It shares design similarities with the 2N3839 model, which exhibits comparable electrical characteristics and is intended for identical high-frequency applications. Both parts utilize the same TO-72 mechanical outline and are optimized for radio frequency signal amplification and conversion tasks.

Replacement Considerations

The 2N3839 is documented as having equivalent electrical specifications and can serve as a direct functional substitute. Verify pinout compatibility and physical dimensions before implementation. No other cross-references are confirmed in the provided documentation.