# Looking for replacement AC AC Adaptor and can't find it anywhere **URL:** \ **Category:** Power Supplies (off-board)\ **Tags:** power-supplies-external-internal-off-board, hammond-manufacturing, cross-reference, ac-ac-wall-power-adapters, power\ **Created:** [January 24, 2024, 7:06pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250 "2024-01-24T19:06:18Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![robertwgray](https://avatars.discourse-cdn.com/v4/letter/r/b9bd4f/32.png) [@robertwgray](https://forum.digikey.com/u/robertwgray)\ **Post date:** [January 24, 2024, 7:06pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/1 "2024-01-24T19:06:18Z")
I can’t find a replacement part for this unit so I am wondering if I there is a similar product I can use or am I pooched. The manufacturer no longer exists. ![image000000](https://global.discourse-cdn.com/digikey/original/3X/9/f/9fb518261f3b2a620fe6bcc63fe457a2779a07c1.jpeg) ---
**Author:** ![ryan\_urness](https://avatars.discourse-cdn.com/v4/letter/r/aca169/32.png) [@ryan\_urness](https://forum.digikey.com/u/ryan_urness)\ **Post date:** [January 24, 2024, 7:17pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/2 "2024-01-24T19:17:17Z")
Hello and welcome, I have a good variety of potential alternates on the below link. If you could let me know the termination style/output cord type this list can be narrowed a bit. > **[Power Supplies - External/Internal (Off-Board) | AC DC Desktop, Wall Power...](https://www.digikey.com/en/products/filter/ac-dc-desktop-wall-power-adapters/130?s=N4IgjCBcoCwBxVAYygMwIYBsDOBTANCAPZQDa4AbAJwxgSFgDsjM8IhArAAxMcDM7EN14AmQYxEUOHGILpSuVEAF1CABwAuUEAGUNAJwCWAOwDmIAL4MwIrohApIGHAWJlwcKhS4dBIkTYUCIQifBSMfLIhMHxgVAIh0nD8fhSRfL4hElQc9CAinnz%2BcnGM3IIw0hxKhPB8zILcVFx2tVRwdI1cEVFCBZ2c4XAJQoxcxZyMYHw1QlShI2Dh1bKqIJraekZmlgz1FPaOzniEJJDkfHBc8AdrG5C6BibmViAAtGLQDlAGAK6uZ3IvmUFlen3I6CQAAJ0AATdCaXD6FQWIA)** > > AC DC Desktop, Wall Power Adapters are in stock at DigiKey. Order Now! Power Supplies - External/Internal (Off-Board) ship same day Thank you Ryan ---
**Author:** ![robertwgray](https://avatars.discourse-cdn.com/v4/letter/r/b9bd4f/32.png) [@robertwgray](https://forum.digikey.com/u/robertwgray)\ **Post date:** [January 24, 2024, 7:34pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/3 "2024-01-24T19:34:43Z")
I know nothing about identifying these things but crossreferencing with a random site this looked like a 5? Thanks for your help. ![IMG_5974](https://global.discourse-cdn.com/digikey/original/3X/4/5/452017c3a4b3c5eb15ac530d95d0eb1da2538c1f.jpeg) ---
**Author:** ![ryan\_urness](https://avatars.discourse-cdn.com/v4/letter/r/aca169/32.png) [@ryan\_urness](https://forum.digikey.com/u/ryan_urness)\ **Post date:** [January 24, 2024, 7:41pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/4 "2024-01-24T19:41:33Z")
Excellent, that sure looks liks the 5.5mm outer size alright. It also appears to be the 2.5mm center as the 2.1mm is only as wide as a toothpick where the 2.5mm is about the width of a ball point pen. Pretty confident in this list just need to match the barrel length off the filters and you should be left with a good match. [AC DC Desktop, Wall Power Adapters | Electronic Components Distributor DigiKey](https://www.digikey.com/en/products/filter/ac-dc-desktop-wall-power-adapters/130?_ga=2.118672268.480939710.1706021341-735759456.1691508736&_gac=1.253871866.1704842752.CjwKCAiA-vOsBhAAEiwAIWR0TRTM9FtP8Ps9PAZK-dUM1JY3tEd2q2k4LY7L-EsaaIZc-UIFTr-YlRoCGrIQAvD_BwE&s=N4IgjCBcoCwBxVAYygMwIYBsDOBTANCAPZQDa4AbAJwxgSFgDsjM8IhArAAxMcDM7EN14AmQYxEUOHGILpSuVEAF1CABwAuUEAGUNAJwCWAOwDmIAL6cx0ECkgYcBYmRB84VLpJXqtkXQYm5lZCjIh2aFh4hCSQ5KyM-EqEfGBwaWEpaWBUAlnpcAKqIJraekZmlgxgIlzh9o7RLnHgHhRcHIIiIjUUCIQifBSMfLIDMKm5XdJw-F0Uo3ydAxJUHPQgIh583XI5iXWEMNIcySDwfMyC3J6H51TpG9wjY0JbdNfDhdeMXmKcjDAfDOp0GeUoiRoPhKfgCFWCDEuFHqkScMVc7i48GRxVK-nKQSqIAAtDZkFADABXZyxcidZQWEI2cjoJAAAnQABN0JpcPoVBYgA) Thank you Ryan ---
**Author:** ![robertwgray](https://avatars.discourse-cdn.com/v4/letter/r/b9bd4f/32.png) [@robertwgray](https://forum.digikey.com/u/robertwgray)\ **Post date:** [January 24, 2024, 7:43pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/5 "2024-01-24T19:43:18Z")
Those all say AC DC not ACAC. Is that an issue? ---
**Author:** ![Ryan\_2724](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/ryan_2724/32/1716_2.png) [@Ryan\_2724](https://forum.digikey.com/u/Ryan_2724)\ **Post date:** [January 24, 2024, 8:07pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/6 "2024-01-24T20:07:22Z")
Hi robertwgray , [HM1579-ND](https://www.digikey.com/en/products/detail/hammond-manufacturing/BPE2FF/454397) _should_ work for this application, although not ideal. The only downside is slightly less wattage so it may generate a bit more heat and fail slightly earlier than the stock supply, depending if your application actually uses the full power rating. The cord you currently have would work on this adapter you would just have to splice the wires for the screw mounts, we also stock [new cords](https://www.digikey.com/en/products/filter/barrel-power-cables/464?_ga=2.79399700.1061145458.1706119779-829270725.1706119774&s=N4IgjCBcoEwBxVAYygMwIYBsDOBTANCAPZQDa4AzGHACwAMIAuoQA4AuUIAymwE4CWAOwDmIAL6EAtDEQgUkPgFcCxMiACsTCSEkBOWfKUqSkchEZjtM0yBaZFowgHd%2BvXE0IA2WfwAmnSTA6CFYOSBAQQjYATxZ3cPRsFEsgA) if you wanted a more customized length. Please review datasheet specifications before ordering. > **Summary** > > Ps17-1530 > Mw57-1802450a > 18vac > 44va ---
**Author:** ![robertwgray](https://avatars.discourse-cdn.com/v4/letter/r/b9bd4f/32.png) [@robertwgray](https://forum.digikey.com/u/robertwgray)\ **Post date:** [January 24, 2024, 8:13pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/7 "2024-01-24T20:13:53Z")
It’s for a sump pump backup battery so I am not sure. I will give this a shot. Thanks so much for your help. ---
**Author:** ![PaulHutch](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/paulhutch/32/3357_2.png) [@PaulHutch](https://forum.digikey.com/u/PaulHutch)\ **Post date:** [January 26, 2024, 2:00pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/8 "2024-01-26T14:00:35Z")
Is the existing unit heavy? If it is then it is very likely an unregulated transformer and will put out a voltage that varies a lot based on the load’s demand. The voltage will be 18 when the current is 2.44A (44W). At lower current it will produces much higher voltage, very likely close to 25 or 30 at less than 0.01A. Whether the system needs that specific behavior or if it will work with a regulated DC voltage only the manufacturer of the system can be certain about. ---
**Author:** ![robertwgray](https://avatars.discourse-cdn.com/v4/letter/r/b9bd4f/32.png) [@robertwgray](https://forum.digikey.com/u/robertwgray)\ **Post date:** [January 29, 2024, 11:02pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/9 "2024-01-29T23:02:12Z")
![image0.jpeg](https://global.discourse-cdn.com/digikey/original/3X/e/2/e23e9990f158c108b219926a3e628087f054d3f6.jpeg) ---
**Author:** ![Ryan\_2724](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/ryan_2724/32/1716_2.png) [@Ryan\_2724](https://forum.digikey.com/u/Ryan_2724)\ **Post date:** [January 29, 2024, 11:36pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/10 "2024-01-29T23:36:40Z")
Hi @robertwgray , Apologies about this. The barrel connector photo appears to have only a tip and sleeve conductor like most power barrel connectors. Are you able to verify if the barrel end has only two connections on it? If so, then one of these 3 wires may only be for an earth ground or for shielding. It looks like the black wire on the left is about 20Awg and the two right wires a bit smaller maybe 22Awg but it is hard to tell. Are you able to notice any difference in the wire sizes by chance? ---
**Author:** ![robertwgray](https://avatars.discourse-cdn.com/v4/letter/r/b9bd4f/32.png) [@robertwgray](https://forum.digikey.com/u/robertwgray)\ **Post date:** [January 29, 2024, 11:45pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/11 "2024-01-29T23:45:10Z")
Now I am noticing they sent totally the wrong cable. That explains it. Oops. ---
**Author:** ![Ryan\_2724](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/ryan_2724/32/1716_2.png) [@Ryan\_2724](https://forum.digikey.com/u/Ryan_2724)\ **Post date:** [January 29, 2024, 11:49pm UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/12 "2024-01-29T23:49:03Z")
Thank you @robertwgray, please let us know if you need any further assistance. ---
**Author:** ![renan-francisco](https://avatars.discourse-cdn.com/v4/letter/r/839c29/32.png) [@renan-francisco](https://forum.digikey.com/u/renan-francisco)\ **Post date:** [March 15, 2025, 1:27am UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/13 "2025-03-15T01:27:15Z")
Hello @robertwgray , @Ryan_2724 , and all. Were you able to find the replacement for this AC adapter? I’m in the hunt for it as well, exact same model: MW57-1802450A, Part No. Ps17-1530. I also need it for a sump pump’s backup system. This is the manual: [Repair Parts - Simer Battery Backup System A5000-04 Owner's Manual [Page 11] | ManualsLib](https://www.manualslib.com/manual/153073/Simer-Battery-Backup-System-A5000-04.html?page=11) I bought this one from Amazon. > **[Amazon.com: 18V 1A AC DC Power Supply Adapter, US Wall Charger, DC Plug...](https://www.amazon.com/5-5x2-1mm-5-5mmx2-5mm-Compatible-100mA-1000mA-Equipment/dp/B082YFWDXY)** > > Buy 18V 1A AC DC Power Supply Adapter, US Wall Charger, DC Plug 5.5x2.1mm & 2.5mm Compatible with for 18volt (0.1A 0.15A 0.2A 0.25A 0.3A 0.4A 0.5A 0.6A 0.7A 0.8A 0.9A) 100mA~1000mA Equipment: AC Adapters - Amazon.com ✓ FREE DELIVERY possible on... The connector fits fine and a multimeter indicates correct voltage coming out of it, but the battery backup system’s lights still don’t indicate correct functioning. So I’m not sure if this adapter I bought is faulty or if the backup system itself is not working. Any suggestions? Thanks!! ---
**Author:** ![robertwgray](https://avatars.discourse-cdn.com/v4/letter/r/b9bd4f/32.png) [@robertwgray](https://forum.digikey.com/u/robertwgray)\ **Post date:** [March 16, 2025, 12:06am UTC](https://forum.digikey.com/t/looking-for-replacement-ac-ac-adaptor-and-cant-find-it-anywhere/38250/14 "2025-03-16T00:06:03Z")
Someone on the site said these two parts would work and they did: [https://www.digikey.ca/en/products/detail/hammond-manufacturing/BPE2FF/454397](https://www.digikey.ca/en/products/detail/hammond-manufacturing/BPE2FF/454397) [https://www.digikey.ca/en/products/detail/tensility-international-corp/CA-2184/568575](https://www.digikey.ca/en/products/detail/tensility-international-corp/CA-2184/568575) Don’t know if that helps. Rob