An enclosure of Tray is used to package the optical attenuator.The RF Attenuator comes in Die packaging, which makes it convenient to ship overseas.The RF Attenuator for the 0 pins explain the functions.
HMC424A-SX Features
0 pins
HMC424A-SX Applications
There are a lot of Analog Devices Inc. HMC424A-SX Attenuators applications.