BLS3135-50,114

Overview

The BLS3135-50 is an NPN silicon planar epitaxial microwave power transistor designed for pulsed applications in the 3.1 to 3.5 GHz band. It operates with a collector-base voltage of 40 V and delivers a typical output power of 50 W with a gain of 8 dB and efficiency of 40%. The device features internal matching networks, emitter ballasting resistors, and gold metallization for reliability. Packaged in the SOT422A flange configuration with a ceramic cap, it includes a common base connected to the flange. Key electrical limits include a peak collector current of 6 A and a maximum junction temperature of 200 °C.

Feature Summary

• Internal input and output matching networks facilitate easy circuit design.
• Emitter ballasting resistors enhance operational ruggedness.
• Gold metallization ensures excellent long-term reliability.
• Interdigitated emitter-base structure provides high emitter efficiency.

Applications

• Common base class-C pulsed power amplifiers for radar systems operating in the 3.1 to 3.5 GHz frequency range.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package variations or environmental compliance status. Confirm that handling procedures account for the beryllium oxide content within the ceramic cap, as damage to this component requires specialized disposal according to local chemical waste regulations.

Selection Notes

Select this component for designs requiring high power density in the S-band with simplified impedance matching requirements. Ensure the thermal management system can handle the specified thermal impedance values under pulsed conditions. Verify that the drive power levels align with the typical impedance data provided for the target operating frequency within the 3.1 to 3.5 GHz band.

Part Context

This part belongs to the Philips Semiconductors (now NXP) discrete semiconductor lineup, specifically categorized as a microwave power transistor. The datasheet was published on April 15, 2003, superseding earlier versions from August 1999. It represents a legacy product specification for high-frequency RF power amplification.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Evaluate alternatives based on matching S-band frequency ranges, similar power output capabilities, and compatible SOT422A or equivalent flange packages.