Current jelly-bean surface-mount transistor?

Ahm ... ... the MMBT3904 :-)

And what makes you think that's 3904-ish?

:-)

Our jellybean NPN is BCX70J. Nice, beta-graded general-purpose thing. The PNP is BCX71.

But I prefer mosfets, like 2N7002 or FDV301, for simple switching apps.

John

...but they typically cost a couple pennies more than a BJT!

Although perhaps one can get that back in fewer biasing resistors...

MMBT3904. ;-)

We're paying, on average

BCX70 0.053

BCX71 0.018

FDV301 0.045

Those numbers are the average of the parts currently in stock, so the prices may be a little noisy.

But yes, our parts placement/inspection cost is way, way more than numbers like these, so eliminating base resistors is well worthwhile. In our business, parts like these are essentially free.

A good FPGA can cost $150 or more. An 8-layer PCB can cost $80, or a lot more for quick turn.

John

MMBT4401

Onsemi and fairchild meets all your specs

or MMBT2222

...

Thanks John, that's handy to have as a reference. I guess there's enough variability within transistors that I really can't say that FET average a bit more, pricewise -- at least for jellybean parts.

The 2N7002 is really crummy unless you're above 5V. I've moved to the Diodes DMG1012T. It's cheap and small (SOT523).

Several times as much. Even the DMG1012T is about 4x what a MMBT3904 costs. The 2N7002 costs as much as the DMG1012T. Did I say that it sucks at low voltages? ;-)

Resistors are $.002. If you don't like adding resistors, use a pre-biased BJT, though they're still more expensive than a BJT + resistors.

I don't have our prices handy but we're paying something like $.05 for a

Our manufacturing cost per part placed is so close to zero it's not measured. If you're worried about base resistors the pre-biased BJTs are a good alternative, too.

What's a "good" GPGA? ;-)

Rohm have a version that's pretty nice. 2.5V drive and still good for

Best regards, Spehro Pefhany

One of the Altera parts with PCI Express and a bunch of serdes channels.

John

FDV301 is a nice logic-level fet, about a nickel in modest quantities.

John

Got a part number?

We were paying over $3K for Virtex-2s and 4s. "Good" can also be $10.

The DMG1012T is a nickel in single reel quantities. We'll do for or five reels of them a year.

BC846/BC856

RK7002 About 3 cents @ 1 reel.

Best regards, Spehro Pefhany

Look at the DMG1012T. Lower threshold, lower capacitance, lower Rds(on) but about five cents.