Restocking the component box.

[Glenn Ashmore]

I am running out of transistors and diodes. If you could only afford to
keep 5 or 6 values on hand which would you get?

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

 

[Don Klipstein]

I am running out of transistors and diodes. If you could only afford to
keep 5 or 6 values on hand which would you get?

Diodes:

* 1N4148 or other small "signal diode" or "switching diode".
* 1N4007 or maybe a 3-amp 1KV wire lead rectifier. Get good ones such as
glass-passivated or whatever if you can.
* maybe a Schottkey diode, such as a 20 or 30 volt 1 amp model, for
low voltage drop.
* High speed/fast-recovery rectifiers, maybe HER105CT or the like.
1N400* types often do not do well in high frequency switching
supplies - use something faster when the frequency is a few KHz to a
couple hundred KHz.

* 1N47** zener diodes of a few choice voltages. Get 16 volt ones if you
build anything using automotive voltage and needs protection from
spikes over 20 volts (MOSFET gates in switching supplies and electronic
ballasts, etc.) 15 volt ones from Radio Shack will work for this but
may be prone to conducting when you don't want them to if the diode
voltage is on the low end of tolerance and the supply voltaghe is on
the high end.
You may also want 5 or 6.3 volt ones to get a reference voltage that
is lower than the supply voltage of most of your projects that require
a reference voltage.

Transistors:

* 2N2222, or similar along with a similar PNP - maybe 2N3904 and 2N3906,
or reasonable equivalents.
* 2N3055 or TIP3055 power transistors.
* A smaller power MOSFET - maybe IRFZ10/IRFZ14. Maybe also the P-channel
version (IRF9Z10?) Versions with a different case style are OK.
Versions with a smaller case style are OK if you keep on hand something
bigger.
* Bigger power MOSFETs such as IRF730 (400 volts approx. 1 ohm) and/or
a really low resistance one such as IRFZ44. Maybe the IRG4BC30UD
"MOS-gate bipolar" (my words) to switch high voltages and high currents.

* Maybe a MOSFET smaller than IRFZ10/whatever, such as one of the 30 volt
ones by Zetex or one of the few smaller power MOSFETs by International
Rectifier, if you need smaller capacitances in them. Check datasheets!
Power MOSFETs normally have lots of capacitance!

- Don Klipstein ([email protected])

 

[John S. Dyson]

Diodes:

* 1N4148 or other small "signal diode" or "switching diode".
* 1N4007 or maybe a 3-amp 1KV wire lead rectifier. Get good ones such as
glass-passivated or whatever if you can.
* maybe a Schottkey diode, such as a 20 or 30 volt 1 amp model, for
low voltage drop.
* High speed/fast-recovery rectifiers, maybe HER105CT or the like.
1N400* types often do not do well in high frequency switching
supplies - use something faster when the frequency is a few KHz to a
couple hundred KHz.

* 1N47** zener diodes of a few choice voltages. Get 16 volt ones if you
build anything using automotive voltage and needs protection from
spikes over 20 volts (MOSFET gates in switching supplies and electronic
ballasts, etc.) 15 volt ones from Radio Shack will work for this but
may be prone to conducting when you don't want them to if the diode
voltage is on the low end of tolerance and the supply voltaghe is on
the high end.
You may also want 5 or 6.3 volt ones to get a reference voltage that
is lower than the supply voltage of most of your projects that require
a reference voltage.

Transistors:

* 2N2222, or similar along with a similar PNP - maybe 2N3904 and 2N3906,
or reasonable equivalents.

Good choices. A tie-breaker might be using the smaller 2N3904/2N3906
for video, very limited low RF, etc. 2N2222/2N2907 more for relay
driving (but also useful for many of the same applications as the
smaller geometry component.)


For an active RF hobby, it might be good to have some LOW-RF/VHF
BJTs available (e.g. MPSH10) for cases where low Ccb is helpful.

Sometimes, a designer might be fond of JFETs, and the J309/J310
family is good, but so are the 2N4416/2N5486.

For wideband or hi IP3 applications, there are some cool
components that are good GP problem solvers like NE46134 and
NE461M02 (which might be helpful where the older components
like the 2N5109 would be slightly higher noise or provide
less bandwidth.)

For GP gain blocks, the Sirenza components (e.g. the 4586) some have
good noise performance (e.g <2dBNF), some have good IP3, and most
have a good mix of performance. (Minicircuits has similar components.)

For an extensive audio hobby, perhaps some large geometry
FETs or BJTs for low noise might be useful (mostly for esoteric
applications, but can indeed perform very well.)

John

 

[Spehro Pefhany]

On Mon, 1 Mar 2004 04:17:33 +0000 (UTC), the renowned

BAV99 (SMT dual 1N4148-like diode) or 1N4148
1N5819 Schottky diode
UF4005
2N4401/3 (or MMBT equivalents for SMT)
I'd get only logic level power MOSFETs (TO-220 or DPAK SMT, << 200mOhm
Rds(on) for <60V. At least low voltage n-channel, low voltage
p-channel and maybe high voltage n-channel.

2N7000 or SMT 2N7002
WO4M 1.5A bridge rectifiers (or the teeny SMT lower current ones)
MPF102 J-FET (maybe)
2SC3355 RF NPN transistor (6.5GHz at 20mA) (maybe)
If you want bipolar power, TIP31C/TIP32C. No darlingtons.

TVS supressors (probably mostly unipolar) for automotive systems.
1500W type, several voltages.

5.1, 6.2, 12 volt zeners, as below.

Diodes:

* 1N4148 or other small "signal diode" or "switching diode".
* 1N4007 or maybe a 3-amp 1KV wire lead rectifier. Get good ones such as
glass-passivated or whatever if you can.
* maybe a Schottkey diode, such as a 20 or 30 volt 1 amp model, for
low voltage drop.
* High speed/fast-recovery rectifiers, maybe HER105CT or the like.
1N400* types often do not do well in high frequency switching
supplies - use something faster when the frequency is a few KHz to a
couple hundred KHz.

* 1N47** zener diodes of a few choice voltages. Get 16 volt ones if you
build anything using automotive voltage and needs protection from
spikes over 20 volts (MOSFET gates in switching supplies and electronic
ballasts, etc.) 15 volt ones from Radio Shack will work for this but
may be prone to conducting when you don't want them to if the diode
voltage is on the low end of tolerance and the supply voltaghe is on
the high end.
You may also want 5 or 6.3 volt ones to get a reference voltage that
is lower than the supply voltage of most of your projects that require
a reference voltage.

Transistors:

* 2N2222, or similar along with a similar PNP - maybe 2N3904 and 2N3906,
or reasonable equivalents.
* 2N3055 or TIP3055 power transistors.
* A smaller power MOSFET - maybe IRFZ10/IRFZ14. Maybe also the P-channel
version (IRF9Z10?) Versions with a different case style are OK.
Versions with a smaller case style are OK if you keep on hand something
bigger.
* Bigger power MOSFETs such as IRF730 (400 volts approx. 1 ohm) and/or
a really low resistance one such as IRFZ44. Maybe the IRG4BC30UD
"MOS-gate bipolar" (my words) to switch high voltages and high currents.

* Maybe a MOSFET smaller than IRFZ10/whatever, such as one of the 30 volt
ones by Zetex or one of the few smaller power MOSFETs by International
Rectifier, if you need smaller capacitances in them. Check datasheets!
Power MOSFETs normally have lots of capacitance!

- Don Klipstein ([email protected])

Best regards,
Spehro Pefhany

 

[Ian Stirling]

Diodes:

* 1N4148 or other small "signal diode" or "switching diode".
* 1N4007 or maybe a 3-amp 1KV wire lead rectifier. Get good ones such as
glass-passivated or whatever if you can.

What can be handy for this sort of thing is a supplier with a sort-by-price
on component categories.