The HSMS-281B-BLKG is a series of semiconductor devices manufactured by Broadcom, and is part of their Silicon-On-Sapphire (SOS) Technology family. It is a Hermetically Sealed Metal Semiconductor (HSMS) device, offering high-performance RF, microwave, and mm-wave solutions. It has a frequency range from DC to 40GHz and an available gain of up to 20dB. It is packaged in a 8-lead Ceramic SIP (Surface Mountable), and is RoHS compliant. This device is ideal for use in high-performance wireless communication systems, automotive applications, satellite communications, industrial systems, and military applications.