Smaller DIP relay standard? - Page 1
Forum section: electronics / projects

author: Richard Crowley
author_rank: Super Contributor
timestamp: September 14, 2018, 01:38:10 pm
content: A guy over on an audio forum (Gearslutz) is building a gadget that requires what appears to be an ordinary DIP relay, except that it looks like it is 0.2 inch width instead of the common 0.3 inch width of a standard DIP.Is that a commodity size, or is it something proprietary from that vendor?The board was designed for "IM07TS" which appears to be made by "Axicom" (who I never heard of before)But all the sources of this appear to have huge backlogs/delivery delays.Is this a generic footprint? Can he find alternative commodity parts?It is 24VDC coil and DPDT switch contacts.Ref:https://www.gearslutz.com/board/geekslutz-forum/1230654-alibaba-safe-sourcing-electronics.html

author: schmitt trigger
author_rank: Super Contributor
timestamp: September 14, 2018, 01:42:33 pm
content: Without having much information about his application, budget or manufacturing constraints,I would do a simple adaptor board to allow a standard 0.3" DIP to be plugged into a 0.2" footprint.That is, until the PWBA can be re-laid to accept either one of those relays.

author: Richard Crowley
author_rank: Super Contributor
timestamp: September 14, 2018, 01:48:05 pm
content: Thanks, @schmitt triggerThat was my first thought also. But this board is incredibly tightly packed and even stacked multiple boards. So there isn't room for a standard 0.3 inch DIP package. And it uses two of these relays.(Don Classics U76A Compressor kit)http://wiki.diyrecordingequipment.com/projects/don-classics-u76a-compressor/

author: schmitt trigger
author_rank: Super Contributor
timestamp: September 14, 2018, 01:55:36 pm
content: Ooops!Your friend is in a tight spot then. (No pun intended).

author: dmills
author_rank: Super Contributor
timestamp: September 14, 2018, 02:29:05 pm
content: Axicom are a TE connectivity brand, and it is worth doing a bit of digging because very often you will find another relay in the same series that is both available and cheaper....These are popular with the RF crowd because the small size makes for excellent HF performance and they are much cheaper then official RF relays.Regards, Dan.

author: macboy
author_rank: Super Contributor
timestamp: September 14, 2018, 02:40:36 pm
content: These 0.2" pitch relays are very common size for signal relays, commonly used in telecom. Look up NEC/Tokin/Kemet/etc. signal relay catalogs, type EC2 or ED2 for example. Careful with the lead spacing, some other series have a non-multiple of 0.1" between the coil and the contact leads.

author: floobydust
author_rank: Super Contributor
timestamp: September 15, 2018, 07:31:28 am
content: I don't see any stock at Digikey or Mouser on the entire IM series, 52+ week lead-times; stock in May 2019This is kinda terrible. I thought maybe the 24V coil was making it rare.I have uh hem, bent the leads in on a 0.3" part to make it fit 0.2" footprint.The relay did not sit totally flush on the PCB, a bit up. If the PCB holes are large, you get some slop.

author: spudboy488
author_rank: Regular Contributor
timestamp: September 17, 2018, 11:44:09 am
content: If you do find an equivalent relay, watch the coil polarity. The Axicom relays I use at least have a polarity to them. Out of habit from using a different relay, I put snubber diodes across the coils. I ended up having to mount the relays on the opposite side of the board to flip the coil. Luckily it was thru-hole.

author: dmills
author_rank: Super Contributor
timestamp: September 17, 2018, 11:56:28 am
content: Yep relay coil polarity in small signal relays can be a nice trap for young players (And even us old farts when we get lazy about reading the datasheets).It is not always about an internal diode either, quite a few of these things have a bias magnet built in to reduce the coil current needed to pull in, and obviously this only works one way.Regards, Dan.

author: cvanc
author_rank: Frequent Contributor
timestamp: September 17, 2018, 12:00:19 pm
content: Quote from: dmills on September 17, 2018, 11:56:28 am(nods in agreement) Yup, that's bitten me in the past. Was a real head-scratcher until I figured it out.

author: Ton
author_rank: Regular Contributor
timestamp: September 17, 2018, 05:56:58 pm
content: Hi thereLooks like Panasonic have something that might fit the footprintAGN20024https://www.digikey.dk/products/en?keywords=agn20024around 3000 in stock at digikeybut 4 mm higher, and max 1A current capabilityorAGQ20T24https://www.digikey.dk/products/en?keywords=%20%09AGQ20T24%200 in stock, but gets stock in November 18quite close in current capabilitybefore you order please check datasheet for IM07T and the above carefullyBR Ton