Return-Path: fredm@media.mit.edu Received: by media.mit.edu (5.57/DA1.0.4.amt) id AA13001; Wed, 6 Oct 93 15:21:41 -0400 Received: from localhost.media.mit.edu by tortuga.media.mit.edu (5.65/DA.WS.1.0.5) id AA23084; Wed, 6 Oct 1993 15:21:36 -0400 Message-Id: <9310061921.AA23084@tortuga.media.mit.edu> To: luni@ccwf.cc.utexas.edu Cc: fredm@media.mit.edu Subject: SGS-Thomson L293D In-Reply-To: Your message of "Wed, 06 Oct 93 14:14:36 CDT." <199310061914.AA08983@thumper.cc.utexas.edu> Date: Wed, 06 Oct 93 15:21:35 -0400 From: "Fred G. Martin" X-Mts: smtp Tom, Lots of people have been having difficulties finding this chip. I haven't bought any recently, so I can only offer my stock advice in this situation: 1. Call SGS-Thomson HQ at 602 867 6100 (Phoenix, AZ). Ask them for the names of any and all stocking distributors in your area. Probably they will provide a list larger than the one you have searched. Go through one by one and try to find a cache of them. 2. A pin-for-pin replacement for the L293D is the Texas Instruments SN754410 [actually, the TI part is better: it can drive 1A per channel rather than 600mA for the SGS-Th part]. Call TI's HQ (sorry, don't have # handy) and go through above process. I'm sorry I can't be more helpful than this. If you don't mind, I would appreciate hearing the results of your search. Thanks, Fred Martin Return-Path: robot-board@oberon.com Received: by media.mit.edu (5.57/DA1.0.4.amt) id AA22287; Tue, 2 Nov 93 16:38:07 -0500 Received: from ([127.0.0.1]) by oberon.com (4.1/SMI-4.1_Armado.MX) id AA05709; Tue, 2 Nov 93 16:34:22 EST Date: Tue, 2 Nov 93 16:34:22 EST Message-Id: <93Nov2.143156-0700.18572-1@scapa.cs.ualberta.ca> Errors-To: gkulosa@oberon.com Reply-To: kube@cs.ualberta.ca Originator: robot-board@oberon.com Sender: gkulosa@oberon.com Precedence: bulk From: Ron Kube To: Multiple recipients of list Subject: L293D alternate replacement X-Listprocessor-Version: 6.0b -- ListProcessor by Anastasios Kotsikonas Status: RO > From: gbruell@wellfleet.com (Greg Bruell ) > Subject: can't find L293D > > I've called Active, Arrow, Digikey, Electronic Buyers Club, Mouser, > SGS-Thompson, All Electronics, American Design Components, > and several others who don't even sell ic's. Does anyone know of a > supplier that has them or maybe someone wants to sell some extras. > > - Desperately Seeking L293D's > I spoke with our friendly Active salesman today, and he says SGS-Thomson is quoting over a 30 week lead time for the L293D. An alternate chip that is pin-compatible with the L293D is Texas Instruments SN754410. (As was mentioned by another board member, page 4-103 of TI Interface Circuits Data Book lists this component as "Improved Functional Replacement for the SGS L293D." In fact, the chip has a 1000ma output current capacity versus the L293D's 600ma. The problem is getting the chips. Most suppliers I have spoken to are asking for a minimum 1000 chip order, except for one. Our local Active Electronics is quoting quantitys of 100 for about $US3.50 per unit, with a 2-3 week delivery date. I suggest people check with their local Active reps for availability. I would be willing (if no one else in the US can) to organize a group purchase of these devices if there is enough interest. The minimum order is 100, and we could use 25 leaving 75 up for grabs. Cheers, Ron -- ======================================================================== C. Ronald Kube Collective Robotic University of Alberta Intelligence Project Robotics Research Laboratory >>>>>> (CRIP) <<<<<< Department of Computing Science 615 General Services Building vv kube@cs.ualberta.ca Edmonton, Alberta @,@ Tel: (403) 492-5113 CANADA T6G 2H1 ( * ) Fax: (403) 492-1071 ========================================m-m============================= Return-Path: luni@ccwf.cc.utexas.edu Received: by media.mit.edu (5.57/DA1.0.4.amt) id AA03036; Mon, 15 Nov 93 14:53:26 -0500 Received: by thumper.cc.utexas.edu id AA08512 (5.65c/IDA-1.4.4 for fredm@media.mit.edu); Mon, 15 Nov 1993 13:53:21 -0600 Date: Mon, 15 Nov 1993 13:53:21 -0600 From: luni@ccwf.cc.utexas.edu Message-Id: <199311151953.AA08512@thumper.cc.utexas.edu> To: fredm@media.mit.edu Subject: L293D's Fred, I never found the SGS Thompson L293D drivers needed for the miniboard. I did find the substitute TI SN754410NE's. I got them from Wyle Laboratories in Santa Clara, CA for $3.70 each, plus a large shipping fee. Their number is (714) 753-9953. They will sell any quantity and I received them in a week. This was the last part I needed, so I didn't look around very long, i.e., there may be a better price out there. If I had known that Greg K. at Ohio State sold full sets of parts, I would have bought them from him and at least saved time calling around if not a few dollars. Thanks for the info on the TI substitute. Hope they work! -Tom Lunifeld Return-Path: luni@ccwf.cc.utexas.edu Received: by media.mit.edu (5.57/DA1.0.4.amt) id AA07561; Wed, 17 Nov 93 20:48:51 -0500 Received: by thumper.cc.utexas.edu id AA00733 (5.65c/IDA-1.4.4 for fredm@media.mit.edu); Wed, 17 Nov 1993 19:48:48 -0600 Date: Wed, 17 Nov 1993 19:48:48 -0600 From: luni@ccwf.cc.utexas.edu Message-Id: <199311180148.AA00733@thumper.cc.utexas.edu> To: fredm@media.mit.edu Subject: Re: L293D's Fred, In response to the shipping fee question, $7.50 by Federal Express. They might ship by UPS ground for less. I didn't get a list of shipping options, but there are probably alternatives. Tom luni@ccwf.utexas.edu Article 7481 of comp.robotics: Newsgroups: comp.robotics Path: news.media.mit.edu!bloom-beacon.mit.edu!gatech!howland.reston.ans.net!pipex!uunet!ftpbox!mothost!schbbs!waccvm.corp.mot.com!R12110 From: R12110@waccvm.corp.mot.com (Jeff Loeliger) Subject: L293Ds in the UK, FOUND. Organization: Motorola Date: 14 Dec 1993 05:35:26 MST Message-ID: <1993Dec14.123930.29285@schbbs.mot.com> Sender: news@schbbs.mot.com (Net News) Nntp-Posting-Host: waccvm.corp.mot.com Lines: 8 I know L293Ds for miniboards can be hard to find. I just got 2 from Maplin in Glasgow. They were 2.95 pounds each in single quanities. They were back-ordered and took about a month. Maplin is all over the UK, check for the nearest store. Jeff Loeliger r12110@email.sps.mot.com Return-Path: anita@ai.mit.edu Received: by media.mit.edu (5.57/DA1.0.4.amt) id AA16749; Tue, 18 Jan 94 16:55:01 -0500 Received: from gnat (gnat.ai.mit.edu) by life.ai.mit.edu (4.1/AI-4.10) for fredm@media.mit.edu id AA19799; Tue, 18 Jan 94 16:54:55 EST From: anita@ai.mit.edu (Anita Flynn) Received: by gnat (4.1/AI-4.10) id AA00950; Tue, 18 Jan 94 16:54:49 EST Date: Tue, 18 Jan 94 16:54:49 EST Message-Id: <9401182154.AA00950@gnat> To: fredm@media.mit.edu, spedhead@mit.edu, rsargent@ai.mit.edu, jlj@ai.mit.edu Subject: L293Ds Thanks for the tip. I found them at the local division of Wyle Labs which is in Brighton for $2.93. They're in stock and with a pre-paid check (for our readers), there is no minimum. -Anita To: froula@bernard.cig.mot.com cc: Multiple recipients of list Subject: Re: L293D versus LM18293N-ND In-reply-to: Your message of "Wed, 19 Jan 94 14:22:46 EST." <9401191919@bernard> -------- Don Froula wrote: > From the miniboard archives, I saw that the National LM18293N-ND was > suggested as a replacement motor driver chip for the hard-to-find > L293D. This part was described as having a higher output rating (1 > Amp), but without the diodes. Is there any problem with using this > part as a motor driver? Of what consequence is the absence of the > diodes? Don't do this, unless you plan to never drive a motor or relay. The diodes are needed to protect the driver transistors from reverse-polarity spikes when operating inductive loads. If the L293D is hard to find, try going for the TI replacement: SN754410. This is available in unit quantities from Wyle Laboratories. They have offices in Brighton, MA and Santa Clara, CA (call 555-1212 for #s, sorry I don't have them). -Fred From: anita@ai.mit.edu (Anita Flynn) Date: Fri, 21 Jan 94 23:28:19 EST To: fredm@media.mit.edu Subject: Wyle office in Brighton It turns out the salesman didn't know where he was -- the office is in Burlington, not Brighton. Wyle 272-7300 Motorola 6811E2s 15 Third Ave. Burlington, MA 01803