Searching some BZX884 2V4 & 3V6 zeners for test
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From: Fred Bartoli on 25 Jan 2010 17:37 I'm searching some BZX884 2V4 & 3V6 NXP/Philips zeners for prototyping. These only sell by the 20k pieces wheel and I want to make some measurements before buying a wheel for maybe nothing. Anyone having a few of those to send? Thanks in advance. -- Thanks, Fred.
From: John Larkin on 25 Jan 2010 18:50 On Mon, 25 Jan 2010 23:37:18 +0100, Fred Bartoli <" "> wrote: >I'm searching some BZX884 2V4 & 3V6 NXP/Philips zeners for prototyping. >These only sell by the 20k pieces wheel and I want to make some >measurements before buying a wheel for maybe nothing. > >Anyone having a few of those to send? > >Thanks in advance. 2.4 volt zeners are pretty terrible regulators... look at their dynamic impedance and TCs. But they are cheap. Can't you get samples from a rep? John
From: Joerg on 25 Jan 2010 18:53 John Larkin wrote: > On Mon, 25 Jan 2010 23:37:18 +0100, Fred Bartoli <" "> wrote: > >> I'm searching some BZX884 2V4 & 3V6 NXP/Philips zeners for prototyping. >> These only sell by the 20k pieces wheel and I want to make some >> measurements before buying a wheel for maybe nothing. >> >> Anyone having a few of those to send? >> >> Thanks in advance. > > 2.4 volt zeners are pretty terrible regulators... look at their > dynamic impedance and TCs. But they are cheap. > > Can't you get samples from a rep? > Unless it's a boutique value and only produced when a large enough order comes in. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 25 Jan 2010 19:32 On Mon, 25 Jan 2010 15:50:25 -0800, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Mon, 25 Jan 2010 23:37:18 +0100, Fred Bartoli <" "> wrote: > >>I'm searching some BZX884 2V4 & 3V6 NXP/Philips zeners for prototyping. >>These only sell by the 20k pieces wheel and I want to make some >>measurements before buying a wheel for maybe nothing. >> >>Anyone having a few of those to send? >> >>Thanks in advance. > >2.4 volt zeners are pretty terrible regulators... look at their >dynamic impedance and TCs. But they are cheap. > >Can't you get samples from a rep? > >John That's what they make TL431's for... sharp "knees". ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Fred Bartoli on 26 Jan 2010 16:23
John Larkin a �crit : > On Mon, 25 Jan 2010 23:37:18 +0100, Fred Bartoli <" "> wrote: > >> I'm searching some BZX884 2V4 & 3V6 NXP/Philips zeners for prototyping. >> These only sell by the 20k pieces wheel and I want to make some >> measurements before buying a wheel for maybe nothing. >> >> Anyone having a few of those to send? >> >> Thanks in advance. > > 2.4 volt zeners are pretty terrible regulators... look at their > dynamic impedance and TCs. But they are cheap. > I know that, and that's why I need some to measure and make a test. I'm not terribly exigent for the reg and the circuit will withstand that, but depending on it's real curves it might pose a startup problem I want to check. Fairchild has some interesting curves in http://www.fairchildsemi.com/ds/MM%2FMM5Z3V3.pdf but I've seen some big datasheet variations between brands on those low voltage diodes, much much more than with more reasonable voltages, so I can't take some other brand to check. I'm not even sure that just a different package, still from NXP, will use the same die. I'll check that with them. Why try to use it? Because it's the tiniest reference I've found, even if crappy. Only 0.6x1mm, with leads under the body. I'll have to cram 27 components on a 7mm diameter pcb, plus 4 connect pads. (4 layers, microvia in pad) Some others are available in a frighteningly huge SOD523/SC79 0.9x1.7mm but I'm afraid I can't afford the 2.5 area. > Can't you get samples from a rep? > I've checked the usual suspects and none have stock, so back to square one. Oh, and reps, here in France, are really unhelpful. Yeah, I'm a just a (no, not a gigolo) consultant (a pretty rare species here), and the customer will be delighted to use half a wheel a year, so nothing to dream about for the reps. -- Thanks, Fred. |