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Macro X Component Package

Geoffrey Hunter Author


Macro X is a 4 lead component package the is used for RF transistors1. As of 2022, the package seems obsolete.


  • Micro-X Ceramic2
  • Package Style M2381

Similar To:

  • Macom CASE 305A-013
  • Macro T1

Microsemi's BJT pinout for this package connected the longest lead to the collector, the lead opposite this to the base, and the other two leads to the emitter1.

Photo of the MRF581 RF NPN transistor in the Macro X component package.

The Macro X package is similar to Macom's CASE 305A-01 component package, used for the Macom MRF158 N-channel RF MOSFET3.



  1. Microsemi (2008, Dec). MRF581: RF & Microwave Discrete Low Power Transistors (datasheet). Retrieved 2022-04-18, from 2 3 4

  2. Digikey. Microsemi Corporation MRF581 (product page). Retrieved 2022-04-18, from

  3. Macom. The Broadband RF TMOS Line, 2W, 500MHz, 28V. Retrieved 2022-04-19, from 2