SD1444

Overview

The SD1444 is an RF bipolar transistor manufactured by Microsemi Corporation, designed for high-frequency applications in the 450 MHz to 512 MHz range. It features a maximum collector current of 400 mA and operates with a maximum voltage rating of 16 V. The device is housed in a TO-39 metal can package, suitable for through-hole mounting. With a power handling capability of 5 W, it is classified as a Class C RF transistor. The component supports frequencies up to 512 MHz, making it appropriate for microwave and radio frequency circuit implementations requiring robust NPN bipolar performance.

Feature Summary

• Optimized for Class C operation within the 450 MHz to 512 MHz frequency band
• Utilizes a TO-39 metal can package for reliable through-hole integration
• Supports a maximum collector current of 400 mA for stable signal processing
• Engineered for high-frequency RF and microwave circuit applications

Applications

• RF amplifier circuits operating in the UHF band
• Microwave communication systems requiring high-frequency stability
• Class C oscillator designs for radio frequency generation

Procurement Notes

Verify the specific manufacturer source, as the SD1444 has been associated with multiple entities including Microsemi, STMicroelectronics, and APT. Confirm the exact datasheet specifications and pinout configuration prior to integration, as historical production changes may affect electrical characteristics. Ensure compatibility with existing thermal management requirements for the TO-39 package.

Selection Notes

Select the SD1444 when designing circuits that require precise operation between 450 MHz and 512 MHz. Consider its 5 W power rating and 16 V voltage limit when determining suitability for specific load conditions. The TO-39 package dictates board layout constraints, necessitating adequate spacing for through-hole mounting and heat dissipation strategies compatible with metal can packages.

Part Context

The SD1444 belongs to the family of RF and microwave transistors produced by Microsemi Corporation. It is categorized under Bipolar (BJT) devices specifically tailored for radio frequency applications. This component represents a specialized solution for high-frequency signal amplification and oscillation, distinct from general-purpose switching transistors due to its optimized frequency response and power handling capabilities.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the specialized nature of RF transistors and potential variations in frequency response and gain among alternatives, direct substitution requires careful verification against original datasheet parameters.