See all VIMOS Power Transistors  

420-470MHz, UHF band, Weather and Long Range Radar Applications
(48V, 300μs Pulse, 10% Duty Cycle)


RF design engineers seeking Long range Radar RF transistors, Long range over-the-horizon RF transistors, or weather Radar RF Transistors will find the ASI portfolio of 420-470MHz pulsed RF Power Transistors to be ideally suited for their unique application. The demanding requirements of this application require very high RF output power levels, extreme ruggedness and high RF Gain. Additionally, because of the expense of replacing devices in the field, a highly reliable RF Transistor is a necessity. With RF Gain of up to 25dB, and RF output power levels of up to 1100 Watts, a single VIMOSTM device can replace multiple competing RF Transistors, which reduces weight, size, cost and design time.

VIMOSTM has been specifically designed to address the common problems that have plagued competing products that were not up to the unique demands of UHF pulsed radar:

  • RUGGEDNESS - VIMOS devices are rated at VSWR of 20:1 and are tested to the industries most stringent VSWR
  • THERMAL – VIMOS’s unique inverted design results in superior thermal performance.
  • GOLD – Unlike some competing LDMOS devices, VIMOS utilizes gold wire bonds, not aluminum which can be susceptible to high cycle fatigue (HCF).
  • PARASITIC BIPOLAR ELEMINATION – Unlike some LDMOS based devices, VIMOS eliminates the failure mechanism
    associated with the parasitic bipolar device (created internally in the LDMOS structure) which can suddenly conduct under
    pulsed conditions resulting in catastrophic device failure.

ASI Semiconductor’s portfolio of RF Power Transistors based on VIMOSTM technology is the ideal solution for 420-470MHz, UHF band, Weather and Long Range Radar Applications.

Select Part Number Description Datasheet Gerber File Eval Kit
HVV0405-175 25dB Gain/175 Watts  PDF ZIP PDF
HVV0405-300 21dB Gain/300 Watts PDF    
HVV0405-1000 16dB Gain/1100 Watts PDF    
  Overview of available VIMOS Downloads  
VIMOS Selector Guide PDF (2.04 MB)
Application Note: VIMOS Reliability Testing Results PDF (250 KB)
Application Note: VIMOS RF Power Transistor Mounting PDF (598 KB)
Application Note: VIMOS Thermal Overview PDF (348 KB)