E
Erik Baigar
- Jan 1, 1970
- 0
Hi,
in a project I am using the dual transistor BC847S in the
SOT363 package. This transistor has a maximum frequency of
200MHz according to the datasheet.
Does anyone know about a pin compatible replacement with
a higher frequency (lets say 500MHz). Gain and Uce are not
so important for me and maximum Ic of 50mA would be OK, too.
The project is that in my russan oscilloscope (C1-122)
there are hybrid switches used for chopping channel
and trigger signals. These switches (04KH009 or
04KN009) tend to die rather often and so I designed a
replacement using the BC847S. In principle it works
fine but the bandwith of the oscilloscope is severely
reduced since the BC847S is not well suited for HF
applications. But using transistors in such a small
package was mandatory to obtain th small form factor
to insert the replacement circuit in the oscilloscope.
This project is also relevant for the following russian
oscilloscopes used by lots of hobbyists: C1-112, C1-112A.
Any hints are welcome,
Erik.
P.S. If someone is interested I'd be able to share my
information and documentation. I have some PCBs
left, too.
in a project I am using the dual transistor BC847S in the
SOT363 package. This transistor has a maximum frequency of
200MHz according to the datasheet.
Does anyone know about a pin compatible replacement with
a higher frequency (lets say 500MHz). Gain and Uce are not
so important for me and maximum Ic of 50mA would be OK, too.
The project is that in my russan oscilloscope (C1-122)
there are hybrid switches used for chopping channel
and trigger signals. These switches (04KH009 or
04KN009) tend to die rather often and so I designed a
replacement using the BC847S. In principle it works
fine but the bandwith of the oscilloscope is severely
reduced since the BC847S is not well suited for HF
applications. But using transistors in such a small
package was mandatory to obtain th small form factor
to insert the replacement circuit in the oscilloscope.
This project is also relevant for the following russian
oscilloscopes used by lots of hobbyists: C1-112, C1-112A.
Any hints are welcome,
Erik.
P.S. If someone is interested I'd be able to share my
information and documentation. I have some PCBs
left, too.