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Product Detailed Parameters
- Description：TRANS 2NPN 15V 50MA TO-78-6
- Series：-
- Mfr：Central Semiconductor Corp
- Package：Bulk
- Transistor Type：2 NPN (Dual)
- Current - Collector (Ic) (Max)：50mA
- Voltage - Collector Emitter Breakdown (Max)：15V
- Vce Saturation (Max) @ Ib, Ic：900mV @ 1mA, 10mA
- Current - Collector Cutoff (Max)：10nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce：50 @ 3mA, 5V
- Power - Max：2W
- Frequency - Transition：600MHz
- Operating Temperature：-65°C ~ 200°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-78-6 Metal Can
- Supplier Device Package：TO-78-6
- Grade：-
- Qualification：-
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Overview
The MD918A is a discontinued NPN VHF oscillator transistor manufactured by Central Semiconductor Corp. It utilizes the TO-78 metal can package and is designed for high-frequency applications. The device features a maximum collector-emitter voltage of 15V, a collector-base voltage of 30V, and an emitter-base voltage of 3V. It supports a continuous collector current of 50mA with a power dissipation rating of 200mW. The transition frequency (fT) is specified at 600MHz, ensuring performance in VHF circuits. Operating temperatures range from -65°C to +200°C.
Feature Summary
- Designed specifically for VHF oscillator circuit applications
- Utilizes hermetically sealed TO-78 metal can packaging
- Capable of operation up to a junction temperature of 200°C
Applications
- VHF oscillator circuits
- High-frequency amplification stages
- Radio frequency signal processing
Procurement Notes
This component has been officially classified as End of Life (EOL) by Central Semiconductor Corp. No replacement part numbers are currently available for this specific model. Procurement is restricted to existing inventory or last-time buy windows. Verification of stock availability through authorized distributors is required before ordering.
Selection Notes
Engineers should identify alternative components due to the EOL status of the MD918A. Selection criteria must match the original design requirements for VHF operation, including the 600MHz transition frequency and 50mA collector current limits. Verify that any substitute device fits the TO-78 footprint or requires a mechanical redesign.
Part Context
The MD918A belongs to a series of discrete bipolar junction transistors produced by Central Semiconductor Corp. This specific model was engineered for robust performance in demanding radio frequency environments. Its discontinuation reflects broader product management decisions regarding legacy semiconductor devices no longer meeting sustainability thresholds.
Replacement Considerations
Central Semiconductor lists 'N/A' for all replacements of the MD918A family. No direct equivalent is provided by the manufacturer. Designers must source third-party alternatives that meet the electrical specifications and physical package constraints.
