PT9703 RF transistor - anyone know the spec on it?

P

Paul Burridge

Guest
Hi all,

I've tried Googling, but Advanced Semiconductor have screwed the
search up with their worthless crap. What are the basic
characteristics of this device? Po, Ft, Gain, Vsupply, typical
application etc.

Thanks,

paul
--

"What is now proved was once only imagin'd." - William Blake, 1793.
 
Hi Paul,

Vague memory but afair it is a UHF (lower UHF) power transistor, maybe
20 watts or so, 24V or 28V (not a 12V type). Could be ok for the 70cm
ham band but that might already be a stretch, probably better for 2m.

Amps with devices like these didn't have a whole lot of gain when used
at their upper frequency limits, certainly less than 10dB so you'd need
something of about a quarter of the power you want as output to drive it.

Again, this is from memory so I am not 100% sure. My hunch is that you
probably can buy 12V versions in a similar power range for little money
these days.

Regards, Joerg

http://www.analogconsultants.com
 
On Thu, 21 Oct 2004 16:24:04 +0100, Paul Burridge
<pb@notthisbit.osiris1.co.uk> wrote:

Hi all,

I've tried Googling, but Advanced Semiconductor have screwed the
search up with their worthless crap. What are the basic
characteristics of this device? Po, Ft, Gain, Vsupply, typical
application etc.
Click to expand...
from TRW '83

PT9703B
spec @ 400MHz
Pgain 10Wout for Pin 1.5W
Collector efficiency 60%
Cob 12pF
Icmax continuous - 1.25A - note that SOA curves limit at 1.125A.
Vceo 30V
Vces 60V
designed for 28Vcc system Common-Emitter UHF
Isolated package (? from mounting stud, I assume)
Rthjc 8.8degC/W
Tj 200degC limit
Pdiss limit @Tc20deg = 20W

RL
 
"Tam/WB2TT" <t-tammaru@c0mca$t.net> wrote in message
news:H8SdnZtSY_Mx0uXcRVn-3g@comcast.com...
"Paul Burridge" <pb@notthisbit.osiris1.co.uk> wrote in message
news:9vkfn0do2d426pnqaijmrrhdb8qj5c8ic4@4ax.com...
Hi all,

I've tried Googling, but Advanced Semiconductor have screwed the
search up with their worthless crap. What are the basic
characteristics of this device? Po, Ft, Gain, Vsupply, typical
application etc.

Thanks,

paul
--

"What is now proved was once only imagin'd." - William Blake, 1793.

It's a UHF NPN power transistor. At 400 MHz, with VCC=28 V, and PO= 10W,
the gain is 8.2 db (min). Maximum collector current is 1.25 amp, and max
dissipation is 20 W @ 25C derated .114 W/C. Claimed collector efficiency
is 60%. Moto must have second sourced this; it is in their 1991 RF book.

Tam
Click to expand...
Yes, the "PT" was second sourced from TRW.

gb
 
On 21 Oct 2004 17:20:39 -0700, skavanagh72nospam@yahoo.ca (Steve
Kavanagh) wrote:


[snip]

Thanks, all!

p.
--

"What is now proved was once only imagin'd." - William Blake, 1793.
 
On Fri, 22 Oct 2004 13:30:18 GMT, "w9gb" <onw9mapsgb@no.arrl.spam.net>
wrote:


Yes, the "PT" was second sourced from TRW.

like "SRF" from Motorola?
Click to expand...

73, JM

---
J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm
 
On Sun, 24 Oct 2004 01:37:21 +0200, J M Noeding <la8ak@online.no>
wrote:

On Fri, 22 Oct 2004 13:30:18 GMT, "w9gb" <onw9mapsgb@no.arrl.spam.net
wrote:



Yes, the "PT" was second sourced from TRW.

like "SRF" from Motorola?
Click to expand...
The Motorola part carried the same part number.

RL
 
On Sun, 24 Oct 2004 01:37:21 +0200, J M Noeding <la8ak@online.no>
wrote:

On Fri, 22 Oct 2004 13:30:18 GMT, "w9gb" <onw9mapsgb@no.arrl.spam.net
wrote:



Yes, the "PT" was second sourced from TRW.

like "SRF" from Motorola?
Click to expand...
Actually the TRW facility at Lawndale was purchased outright by
Motorola sometime between 1987 and 1990. The PT9703 was never
available from both mfrs simultaneously, so it was always
single-sourced.

RL
 
"Paul Burridge" <pb@notthisbit.osiris1.co.uk> wrote in message
news:9vkfn0do2d426pnqaijmrrhdb8qj5c8ic4@4ax.com...
Hi all,

I've tried Googling, but Advanced Semiconductor have screwed the
search up with their worthless crap. What are the basic
characteristics of this device? Po, Ft, Gain, Vsupply, typical
application etc.

Thanks,

paul
--

"What is now proved was once only imagin'd." - William Blake, 1793.
Click to expand...
It's a UHF NPN power transistor. At 400 MHz, with VCC=28 V, and PO= 10W,
the gain is 8.2 db (min). Maximum collector current is 1.25 amp, and max
dissipation is 20 W @ 25C derated .114 W/C. Claimed collector efficiency is
60%. Moto must have second sourced this; it is in their 1991 RF book.

Tam
 
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