Hello Jorgen,

Jorgen Lund-Nielsen wrote:

[.....]
2N2369 for fast pulses.

btw, do you know a standard complementary pnp-transistor for the 2N2369,
such like 2N3905 but with higher ft and less feedback capacitance? It
seems that the manufactorers have almost no data on their internet pages.

mfg. Winfried

On Sat, 26 Nov 2005 21:41:06 +0100, Winfried Salomon
wrote:

Hello Jorgen,

Jorgen Lund-Nielsen wrote:

[.....]
2N2369 for fast pulses.

btw, do you know a standard complementary pnp-transistor for the 2N2369,
such like 2N3905 but with higher ft and less feedback capacitance? It
seems that the manufactorers have almost no data on their internet pages.

mfg. Winfried

A 2N2369 is a gold-doped NPN, gold-doped to kill storage time and
improve recovery from saturation. I don't recall any PNP device with
gold-doping... or the equivalent.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Hello Jim,

Jim Thompson wrote:
[...]
btw, do you know a standard complementary pnp-transistor for the 2N2369,
such like 2N3905 but with higher ft and less feedback capacitance? It
seems that the manufactorers have almost no data on their internet pages.

[...]


A 2N2369 is a gold-doped NPN, gold-doped to kill storage time and
improve recovery from saturation. I don't recall any PNP device with
gold-doping... or the equivalent.

thank you, then I suppose the 2N3905 oder 2N2905 are fitting for a large
signal amplifier.

mfg. Winfried

Jim Thompson wrote:
On Sat, 26 Nov 2005 21:41:06 +0100, Winfried Salomon
wrote:

Hello Jorgen,

Jorgen Lund-Nielsen wrote:

[.....]
2N2369 for fast pulses.

btw, do you know a standard complementary pnp-transistor for the 2N2369,
such like 2N3905 but with higher ft and less feedback capacitance? It
seems that the manufactorers have almost no data on their internet pages.

mfg. Winfried

A 2N2369 is a gold-doped NPN, gold-doped to kill storage time and
improve recovery from saturation. I don't recall any PNP device with
gold-doping... or the equivalent.

...Jim Thompson

National Semi's (now Fairchild) 2n5771 was a gold-doped PNP.
ft=850MHz. For avalanche mode one might try the lower-Vce-rated
PN3640 (12v), or PN3639 (6v).

I might even have notes on this. I tested/compared various BJTs in
avalanche mode some years ago, trying to find the "best." ISTR picking
the 2n2369, both because it was fast, and because it avalanched
reliably where other types wouldn't.

James Arthur

On 30 Nov 2005 14:32:29 -0800, wrote:


Jim Thompson wrote:
On Sat, 26 Nov 2005 21:41:06 +0100, Winfried Salomon
wrote:

Hello Jorgen,

Jorgen Lund-Nielsen wrote:

[.....]
2N2369 for fast pulses.

btw, do you know a standard complementary pnp-transistor for the 2N2369,
such like 2N3905 but with higher ft and less feedback capacitance? It
seems that the manufactorers have almost no data on their internet pages.

mfg. Winfried

A 2N2369 is a gold-doped NPN, gold-doped to kill storage time and
improve recovery from saturation. I don't recall any PNP device with
gold-doping... or the equivalent.

...Jim Thompson

National Semi's (now Fairchild) 2n5771 was a gold-doped PNP.
ft=850MHz. For avalanche mode one might try the lower-Vce-rated
PN3640 (12v), or PN3639 (6v).

I might even have notes on this. I tested/compared various BJTs in
avalanche mode some years ago, trying to find the "best." ISTR picking
the 2n2369, both because it was fast, and because it avalanched
reliably where other types wouldn't.

James Arthur


Hi, James,

Interestingly, the best avalanchers aren't usually super-fast
transistors, but old klunky things. The Zetex avalanche transistors
have lowish Ft's and are made in Russia, maybe on an old process.

John

John Larkin wrote:
On 30 Nov 2005 14:32:29 -0800, wrote:


Jim Thompson wrote:

snip quote

A 2N2369 is a gold-doped NPN, gold-doped to kill storage time and
improve recovery from saturation. I don't recall any PNP device with
gold-doping... or the equivalent.

...Jim Thompson

National Semi's (now Fairchild) 2n5771 was a gold-doped PNP.
ft=850MHz. For avalanche mode one might try the lower-Vce-rated
PN3640 (12v), or PN3639 (6v).

I might even have notes on this. I tested/compared various BJTs in
avalanche mode some years ago, trying to find the "best." ISTR picking
the 2n2369, both because it was fast, and because it avalanched
reliably where other types wouldn't.

James Arthur


Hi, James,

Interestingly, the best avalanchers aren't usually super-fast
transistors, but old klunky things. The Zetex avalanche transistors
have lowish Ft's and are made in Russia, maybe on an old process.

John

Howdy John,
I was unclear: by "...it was fast..." I meant the 2n2369 was one of
the devices with the fastest avalanche edges.

Digging through some of my notes, I don't see the BJT comparison, but
a 2n2222 biased to +100Vce, banged / triggered by a 74HC-series gate,
gave synchronous 750pS risetime pulses. Not very impressive, really,
though good for higher-power stuff than I needed.

Interestingly, I found a 74AC00 driving an MPS2369 was faster & less
trouble: 360pS fall (turn on) time, & 570pS rise (turn off) time, and
no nasty high voltage supplies. It was possibly even a little faster
than measured--at 360pS I was pushing my poor little 7S14 1-GHz
sampling plug-in pretty hard.

Best,
James

Winfried Salomon wrote:
Hello Jorgen,

Jorgen Lund-Nielsen wrote:

[.....]

2N2369 for fast pulses.


btw, do you know a standard complementary pnp-transistor for the 2N2369,
such like 2N3905 but with higher ft and less feedback capacitance? It
seems that the manufactorers have almost no data on their internet pages.

mfg. Winfried

Maybe 2N4261 ? Have not looked into the datasheet, but as i remember,
i have seen them sometimes in complementary with the 2N2369

Jorgen

Hello Jorgen,

Jorgen Lund-Nielsen wrote:



Winfried Salomon wrote:

Hello Jorgen,

Jorgen Lund-Nielsen wrote:

[.....]

2N2369 for fast pulses.



btw, do you know a standard complementary pnp-transistor for the
2N2369, such like 2N3905 but with higher ft and less feedback
capacitance? It seems that the manufactorers have almost no data on
their internet pages.

mfg. Winfried


Maybe 2N4261 ? Have not looked into the datasheet, but as i remember,
i have seen them sometimes in complementary with the 2N2369


the problem is, that it is an rf-transistor and can't be driven at
30V/0.2A, I found a complementary in an old table KTT, the 2N2894A, but
it also has max. 12V, so I find no other than the 2N3906.

If I simulate with the 2N3906, the frequency response is not worse than
with the 2N2894A.

mfg. Winfried

Winfried Salomon wrote...
Jorgen Lund-Nielsen wrote:
Winfried Salomon wrote:

btw, do you know a standard complementary pnp-transistor for the
2N2369, such like 2N3905 but with higher ft and less feedback
capacitance? It seems that the manufactorers have almost no data
on their internet pages.

Maybe 2N4261? Have not looked into the datasheet, but as i remember,
i have seen them sometimes in complementary with the 2N2369

That was a high-frequency part for the time, spec'd at 1200MHz...

the problem is, that it is an rf-transistor and can't be driven at
30V/0.2A, I found a complementary in an old table KTT, the 2N2894A,
but it also has max. 12V, so I find no other than the 2N3906.

An old Raytheon datasheet says the 2N2894 was doped with platinum.

BTW -- in AoE, we list the 2n5771 as a PNP complement to the NPN
2n5769, both 15V plastic versions of older metal-can parts.


--
Thanks,
- Win

On 30 Nov 2005 18:46:34 -0800, Winfield Hill
wrote:

Winfried Salomon wrote...
Jorgen Lund-Nielsen wrote:
Winfried Salomon wrote:

btw, do you know a standard complementary pnp-transistor for the
2N2369, such like 2N3905 but with higher ft and less feedback
capacitance? It seems that the manufactorers have almost no data
on their internet pages.

Maybe 2N4261? Have not looked into the datasheet, but as i remember,
i have seen them sometimes in complementary with the 2N2369

That was a high-frequency part for the time, spec'd at 1200MHz...

the problem is, that it is an rf-transistor and can't be driven at
30V/0.2A, I found a complementary in an old table KTT, the 2N2894A,
but it also has max. 12V, so I find no other than the 2N3906.

An old Raytheon datasheet says the 2N2894 was doped with platinum.

[snip]

Thanks for tracking that down, Win! Gold in a PNP was certainly
troubling my ancient remembrance of semiconductor chemistry.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.