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Product Detailed Parameters
- Description：RF TRANS PNP 25V 2.5GHZ TO-72
- Series：-
- Mfr：Central Semiconductor Corp
- Package：Bulk
- Transistor Type：PNP
- Voltage - Collector Emitter Breakdown (Max)：25V
- Frequency - Transition：2.5GHz
- Noise Figure (dB Typ @ f)：-
- Gain：25dB
- Power - Max：300mW
- DC Current Gain (hFE) (Min) @ Ic, Vce：20 @ 2mA, 10V
- Current - Collector (Ic) (Max)：30mA
- Operating Temperature：-65°C ~ 200°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-206AF, TO-72-4 Metal Can
- Supplier Device Package：TO-72
- Grade：-
- Qualification：-
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Overview
The Central Semiconductor CM4957 PBFREE is a silicon PNP high-frequency transistor housed in a hermetically sealed TO-72 case. It serves as a replacement for the 2N4957 and is designed for RF amplifier and non-saturated switching applications. Key electrical parameters include a collector-base voltage of 30 V, collector-emitter voltage of 25 V, and continuous collector current of 30 mA. The device features a transition frequency (fT) ranging from 1200 to 2500 MHz at 100 MHz test frequency. Power dissipation is rated at 200 mW generally and 300 mW at 25°C case temperature. Operating junction temperature spans -65 to +200 °C.
Feature Summary
- Hermetically sealed package construction suitable for demanding environments
- Optimized for high-frequency amplifier and non-saturated switching operations
- Lead-free plating finish compliant with environmental directives
Applications
- High frequency amplifier circuits
- Non-saturated switching applications
- RF signal processing stages
Procurement Notes
Verify availability status carefully as this component has been designated Stock Only following discontinuation notices. Confirm lead finish specifications match design requirements, noting that Pb-free variants require specific ordering suffixes. Contact sales representatives directly for inventory confirmation since standard production orders are no longer accepted.
Selection Notes
Select this component when hermetic sealing and high-frequency performance are required for PNP configurations. Ensure circuit designs accommodate the specified voltage limits and power dissipation constraints. Verify thermal management strategies align with the operating junction temperature range to maintain reliability during continuous operation.
Part Context
This device replaces the legacy 2N4957 transistor within the same form factor. It belongs to a family of RF transistors manufactured by Central Semiconductor Corp. The PBFREE designation indicates compliance with lead-free manufacturing standards, distinguishing it from traditional tin-lead plated versions available under different part number suffixes.
Replacement Considerations
No direct replacement part numbers are officially documented for this discontinued item. Users must consult engineering support for potential alternate sources or evaluate equivalent specifications from other manufacturers if stock becomes unavailable.
