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HomeBench InstrumentsAmplifiers/filtersSR445A - 350 MHz Preamplifier

SR445A - 350 MHz Preamplifier

SR445A - 350 MHz Preamplifier
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SR445A - 350 MHz Preamplifier
SR445A - 350 MHz Preamplifier

The Model SR445A 350 MHz Preamplifier contains four wide-bandwidth, DC-coupled amplifiers, each with a gain of 5.

The four channels may be used independently, or cascaded to provide a total gain of up to 625.

The fast rise time, low noise, and excellent DC accuracy of the SR445A make it an ideal instrument for amplifying the outputs of fast photomultiplier tubes and photodiodes.

The SR445A can be used to improve the sensitivity of oscilloscopes, photon counters, boxcar averagers, spectrum analyzers, and other high-frequency test equipment.


Each channel has an input and output impedance of 50 Ω . The input impedance of channel 1 can be increased to approximately 500 WΩ by a front-panel switch.

This can improve the sensitivity of signals from current and charge output devices, such as photomultiplier tubes. Each channel has a separate offset adjustment allowing you to quickly null DC errors.






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  • 4 independent channels
  • DC to 350 MHz bandwidth
  • 1 ns rise/fall time
  • 6.4 nV/√Hz input noise
  • Voltage gain to 625
  • 50 W input and output impedance
  • 3 ns overload recovery
  • Excellent phase linearity
The price include all shipping costs and import duties into the Baltic and Scandinavian countries within EU.
Download datasheet »
Instrumentcenter Sweden AB, Box 233, 611 25 Nyköping - Sweden. | Tel: +46 155 26 70 30, Fax: +46 155 26 78 30
Delivery address: Folkungavägen 4, 611 34 Nyköping, Sweden
E-post:  International phone +46 155 26 70 30  Fax +46 155 26 78 30