help to get / buy outside North America MMA 0204 1% 400mw metal film resistors - Page 1
Forum section: electronics / general

author: coromonadalix
author_rank: Super Contributor
timestamp: May 10, 2017, 05:12:51 pm
content: I have a project running here : A new dc option board for pm6303/6304/6306 lcr metersI did succeed designing it with smt 1210 sizes, but i hit a wall to shrink more the board size, it will fit but not installed as the original one.Original will be at 90 degree, and mine will be in parallel to the main board ...I`ll post values later, i have 37 different values to buy in 1% precision metal film, normally found at VishayI need someone who could buy them for me and ship them to me in Canada, i have 3 major parts supliers like Digikey, Electrosonic and Mouser, but no successThank You

author: james_s
author_rank: Super Contributor
timestamp: May 10, 2017, 06:35:13 pm
content: I can do that for you if you PM me a list of Digikey part numbers and quantity needed. I have a few small parts I can tack on that aren't worth an order just for them.

author: thm_w
author_rank: Super Contributor
timestamp: May 10, 2017, 06:42:55 pm
content: Does it need to be metal film for some reason?0402 10ppm 0.1% or 0.25% thin film is available from digikey, among many others. Shipping is cheap in canada.

author: james_s
author_rank: Super Contributor
timestamp: May 10, 2017, 06:47:25 pm
content: Oh I missed that it says Digikey doesn't have them, that's odd, the parts don't sound like anything exotic.

author: TheSteve
author_rank: Unknown
timestamp: May 10, 2017, 07:01:27 pm
content: I assume the "0204" is a typo and that you weren't actually searching Digikey for 0204 and are looking for 0402.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 10, 2017, 08:19:04 pm
content: The model is really MMA 0204 series resistors like the attached photo, a somewhat old type of casing if i may say ??The problem are the strange values at 1% precision at 400 milliwatts, and finally metal film as stated in the manualI can find a few, but not all of them, and sometime they ask 15 weeks order timeHere's the start list to begin with: I need at least 20 parts of each values and 40x for the 10k value56.2 ohms100 ohms464 ohms1k2.37k or 2k373.16k or 3k163.83k or 3k835.11k or 5k116.19k or 6k1910k19.6k or 19k621.5k or 21k531.6k or 31k634.8k or 34k851.1k or 51k1464k1 meg4.64 meg or 4m64

author: DaJMasta
author_rank: Super Contributor
timestamp: May 10, 2017, 09:12:37 pm
content: Have you searched digikey for Dave's favorite MELF packaged resistors? I'm seeing 400mW MELF 0204 packaged vishays on digikey in a few pages of values available.They're listed as "Thin Film" not metal film, but as I understand that doesn't necessarily mean that it's a different process than you're expecting. You're still looking for a deposited film instead of a foil, correct?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 11, 2017, 01:33:35 am
content: hum maybe they're the same have to re-check that ....I have all the values in smt 1210 package, but mma0204never saw theses, until highvoltage sent me his boards to help me duplicate them ...EDIT : it opened new possibilities, but lots of needed values aren't available

author: DaJMasta
author_rank: Super Contributor
timestamp: May 11, 2017, 02:37:39 am
content: Dunno your exact size constraints, but to get a bit more dissipation without going full 1210, there are some half watt 0805s which may be worth considering. If it was for a prototype style design without needing mass production, you could even probably fit two 0805s on a 0204 melf sized pad or just put a 1206 on its side or something. Don't know if they are viable options for you, but it's something.

author: james_s
author_rank: Super Contributor
timestamp: May 11, 2017, 05:44:56 pm
content: Well if you do find a supplier in the US that has what you need, my offer still stands to forward them on to you, but I don't have a supplier in mind. Digikey and Mouser are my usual go-to.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 13, 2017, 12:59:50 pm
content: At Digikey and others i have 13 weeks of lead timewayyyyyy too much for my taste, no guaranties to have them, sent mails to Vishay ...