2N3660

Microchip Technology 2N3660 Detailed Overview

General Description
The Microchip Technology 2N3660 is a high-frequency NPN bipolar junction transistor (BJT) designed primarily for RF amplification and oscillator applications in the VHF and UHF frequency ranges. This transistor offers excellent gain, low noise figure, and high power output capability, making it suitable for use in radio transmitters, receivers, and intermediate frequency (IF) amplifier stages. It is widely recognized for its rugged construction, reliable performance, and ease of integration in various high-frequency analog circuits.

Device Structure and Type

* Type: NPN silicon planar epitaxial transistor
* Intended Use: RF power amplifier and driver stages in communication equipment
* Construction: Planar epitaxial technology ensuring high gain and low noise
* Package: Hermetically sealed metal can (TO-18 or TO-39 style) providing excellent thermal dissipation and environmental protection

Electrical Characteristics

* Collector-Emitter Voltage (V\_CEO): Maximum 30 V — maximum voltage allowed between collector and emitter terminals without breakdown
* Collector-Base Voltage (V\_CBO): Maximum 60 V — maximum voltage between collector and base with emitter open
* Emitter-Base Voltage (V\_EBO): Maximum 5 V — maximum voltage allowed between emitter and base
* Collector Current (I\_C): Continuous current up to 100 mA typical, suitable for low to moderate power amplification
* Gain (h\_FE or β): Typical forward current gain ranges from 50 to 150 depending on operating frequency and bias conditions
* Transition Frequency (f\_T): Approximately 1 GHz — defines the frequency at which current gain drops to unity, suitable for VHF/UHF applications
* Power Dissipation (P\_D): Around 1 watt maximum with adequate heat sinking, supporting medium power output stages
* Noise Figure: Low noise figure characteristics enhance performance in low signal-level RF circuits

Frequency Performance

* Designed for operation typically in the range from 30 MHz to 1 GHz
* Suitable for use in RF amplifier stages, oscillator circuits, mixers, and frequency multipliers
* Provides stable gain and linearity across VHF and lower UHF bands

Thermal and Mechanical Characteristics

* Package Type: Hermetically sealed metal can, commonly TO-18 or TO-39 outline
* Thermal Resistance (Junction-to-Ambient): Low thermal resistance due to metal can package, enabling efficient heat dissipation
* Operating Temperature Range: Typically -65°C to +200°C junction temperature, suitable for industrial and military environments
* Storage Temperature Range: -65°C to +200°C ensuring robust handling and storage conditions

Biasing and Operating Conditions

* Optimized for class A and class AB amplifier configurations
* Requires appropriate biasing circuits to maintain linearity and minimize distortion
* Recommended operating point typically involves collector current in the range of 20 mA to 100 mA for optimal gain and linearity

Applications

* RF power amplifiers for transmitters in amateur, commercial, and industrial radios
* VHF/UHF oscillator circuits and frequency synthesizers
* Intermediate frequency (IF) amplifiers in radio receivers and television tuners
* Low noise amplifiers (LNA) in communication and radar systems
* Signal amplification in test and measurement equipment
* Military and aerospace RF applications due to rugged design and wide temperature range

Reliability and Quality

* Built with hermetic sealing to protect against moisture and contaminants, improving longevity and reliability
* Metal can packaging provides mechanical robustness and stable electrical characteristics over time
* Suitable for harsh environments, including extreme temperatures and vibration conditions

Summary of Key Specifications

| Parameter | Value | Notes |
| ---------------------------------- | ----------------------------- | ---------------------------------- |
| Collector-Emitter Voltage (V\_CEO) | 30 V | Maximum voltage rating |
| Collector-Base Voltage (V\_CBO) | 60 V | Maximum voltage rating |
| Emitter-Base Voltage (V\_EBO) | 5 V | Maximum voltage rating |
| Collector Current (I\_C) | Up to 100 mA | Continuous current rating |
| Power Dissipation (P\_D) | ~1 W | Maximum power dissipation |
| Transition Frequency (f\_T) | ~1 GHz | Frequency at unity gain |
| Gain (h\_FE) | 50 to 150 | Forward current gain typical range |
| Package | Hermetically sealed metal can | TO-18 or TO-39 style |
| Operating Temperature Range | -65°C to +200°C | Junction temperature range |

The Microchip Technology 2N3660 transistor is a versatile and reliable device specifically engineered for RF applications requiring moderate power, low noise, and high gain at VHF and UHF frequencies. Its robust metal can packaging, combined with excellent electrical characteristics, makes it well suited for demanding environments in both commercial and military sectors.