Replacement for SRF3999 RF power MOSFET?

P

pdmtr

Guest
Hi
Does anyone knows a replacement equivalent for the MOTOROLA SRF-3999
RF MOSFETs?
Thanks in advance
Sotiris
 
pdmtr wrote:
Hi
Does anyone knows a replacement equivalent for the MOTOROLA SRF-3999
RF MOSFETs?
Thanks in advance
Sotiris
Click to expand...
'SRF' are propritary part numbers, custom marked for their customer.
BTW, Motorola is no longer in that business. On Semiconducotr took over
those lines years ago.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
On Nov 14, 12:33 am, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:
pdmtr wrote:

Hi
Does anyone knows a replacement equivalent for the MOTOROLA SRF-3999
RF MOSFETs?
Thanks in advance
Sotiris

'SRF' are propritary part numbers, custom marked for their customer.
BTW, Motorola is no longer in that business. On Semiconducotr took over
those lines years ago.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
Click to expand...
Hi
Yes I do know that, but all SRFs was common commercial transistors and
I do remember that there was a list available with the equivalent,
back at 80's. I had such lists, but after 3 lab moves many papers have
been lost ;(
So anyone knowing what was the SRF3999 on a commercial available P/N?
Thanks in advance
Sotiris

PS These were used at 150W P-P RF amplifiers to HARRIS FM
transmitters, if that helps to wake up memories ;)
 
On Thu, 15 Nov 2007 12:25:16 -0800 (PST), pdmtr <pdmtr@yahoo.com> put
finger to keyboard and composed:

On Nov 14, 12:33 am, "Michael A. Terrell" <mike.terr...@earthlink.net
wrote:
pdmtr wrote:

Hi
Does anyone knows a replacement equivalent for the MOTOROLA SRF-3999
RF MOSFETs?
Thanks in advance
Sotiris

'SRF' are propritary part numbers, custom marked for their customer.
BTW, Motorola is no longer in that business. On Semiconducotr took over
those lines years ago.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Hi
Yes I do know that, but all SRFs was common commercial transistors and
I do remember that there was a list available with the equivalent,
back at 80's. I had such lists, but after 3 lab moves many papers have
been lost ;(
So anyone knowing what was the SRF3999 on a commercial available P/N?
Thanks in advance
Sotiris

PS These were used at 150W P-P RF amplifiers to HARRIS FM
transmitters, if that helps to wake up memories ;)
Click to expand...
I have a 1984 Motorola master selection guide. The only RF Power FETs
with a 150W power spec are MRF140 and MRF150. MRF174 is rated for
125W. The first two are characterised at 30MHz, the latter at 150MHz.
All but the MRF150 (50V) have a Vdd of 28V. The case style is 211-11
(0.500 flange).

http://www.datasheetarchive.com/datasheetpreview/DataBooks/Document249111.jpg
http://www.datasheetarchive.com/datasheetpreview/DataBooks/Document249215.jpg

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
Hi Frank
Thanks for the suggestions but these are case style 316-01 (more like
the MRF317 transistors), working at 28Vdc (although the PSU can be
adjusted up to 32Vdc !? ). I do have all of the Databooks from Moto
since late 70's until even after the name turn to "ON semic" (at
first, now at Macom & Freescale) and have tried to find similarity to
RF MOSFETs for them, without any luck! The original HARRIS transmitter
circuit schematic has them as MOSFETs, but I'm a bit sceptical about
them, as the topology, connections and the circuit itself, seems to
have been designed for common RF transistors... ie no +Vg bias
circuit, just a 10 Ohm grounded resistor from the gates! Probably
class C circuit, but I can't remember any Moto's MOSFET having that
case style (316-01 6lead flange planar)! Thought to ask here as there
was times that an SRF to MRF chart published periodically from Moto,
and maybe someone still have them to give a look... :(
I might try to put the MRF317 ! instead of some MOSFETs as the RF
output power levels, PSU and the onboard broadband transmittion line
input/output matching section looks quite similar (if not say as
exactly same) with those used with the MRF317s!
However thanks everyone replied to my quote...
Regards
Sotiris


On Nov 16, 11:49 pm, Franc Zabkar <fzab...@iinternode.on.net> wrote:
On Thu, 15 Nov 2007 12:25:16 -0800 (PST), pdmtr <pd...@yahoo.com> put
finger to keyboard and composed:





On Nov 14, 12:33 am, "Michael A. Terrell" <mike.terr...@earthlink.net
wrote:
pdmtr wrote:

Hi
Does anyone knows a replacement equivalent for the MOTOROLA SRF-3999
RF MOSFETs?
Thanks in advance
Sotiris

'SRF' are propritary part numbers, custom marked for their customer.
BTW, Motorola is no longer in that business. On Semiconducotr took over
those lines years ago.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Hi
Yes I do know that, but all SRFs was common commercial transistors and
I do remember that there was a list available with the equivalent,
back at 80's. I had such lists, but after 3 lab moves many papers have
been lost ;(
So anyone knowing what was the SRF3999 on a commercial available P/N?
Thanks in advance
Sotiris

PS These were used at 150W P-P RF amplifiers to HARRIS FM
transmitters, if that helps to wake up memories ;)

I have a 1984 Motorola master selection guide. The only RF Power FETs
with a 150W power spec are MRF140 and MRF150. MRF174 is rated for
125W. The first two are characterised at 30MHz, the latter at 150MHz.
All but the MRF150 (50V) have a Vdd of 28V. The case style is 211-11
(0.500 flange).

http://www.datasheetarchive.com/datasheetpreview/DataBooks/Document24...http://www.datasheetarchive.com/datasheetpreview/DataBooks/Document24...

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.- Hide quoted text -

- Show quoted text -
Click to expand...
 
On Tuesday, November 13, 2007 5:57:22 AM UTC-6, pdmtr wrote:
Hi
Does anyone knows a replacement equivalent for the MOTOROLA SRF-3999
RF MOSFETs?
Thanks in advance
Sotiris
Click to expand...

This is an old post, but I have some original new old stock SRF-3999,
just found in grandfathers supply.
 
On Wed, 12 Feb 2014, billbenge66@gmail.com wrote:

On Tuesday, November 13, 2007 5:57:22 AM UTC-6, pdmtr wrote:
Hi
Does anyone knows a replacement equivalent for the MOTOROLA SRF-3999
RF MOSFETs?
Thanks in advance
Sotiris

This is an old post, but I have some original new old stock SRF-3999,
just found in grandfathers supply.

Then email the guy.
Click to expand...

He's not here, and chances are good he was never here longer than to post
this.

CHances are good that the email address on the post isn't any good
anymore, but that makes more sense than posting a reply 6.5 years later.

Just because google allows replies to messages older than 30 days doesn't
mean there is any reason for replies to posts older than 30 days.

Michael
 
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