# Identification of broad component **URL:** \ **Category:** Semiconductor\ **Tags:** optoisolators, isolators, part-identification\ **Created:** [December 2, 2024, 8:29pm UTC](https://forum.digikey.com/t/identification-of-broad-component/46911 "2024-12-02T20:29:09Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![M3mmer](https://avatars.discourse-cdn.com/v4/letter/m/3e96dc/32.png) [@M3mmer](https://forum.digikey.com/u/M3mmer)\ **Post date:** [December 2, 2024, 8:29pm UTC](https://forum.digikey.com/t/identification-of-broad-component/46911/1 "2024-12-02T20:29:09Z")
Hi all hopefully I can get some help here identifying this 4-pin surface mounted component. It appears to be a Fairchild component with the numbers 2705 and 519R. I think it’s an integrated rectifier but could be something else as wellThe board is a soft starter for residential AC. The component has 110 to 220V input and appears to be directly downstream of a step down transformer. The component is approximately 3.5mm in width/length plus legs. ![image](https://global.discourse-cdn.com/digikey/original/3X/1/3/13864275577e0e625a1e5d314b84c731647dd1d3.jpeg) . ![image](https://global.discourse-cdn.com/digikey/original/3X/8/c/8ce323848db0af074e96fa592fbfe9438fce9862.jpeg) ---
**Author:** ![Craig\_2048](https://avatars.discourse-cdn.com/v4/letter/c/6a8cbe/32.png) [@Craig\_2048](https://forum.digikey.com/u/Craig_2048)\ **Post date:** [December 2, 2024, 8:52pm UTC](https://forum.digikey.com/t/identification-of-broad-component/46911/2 "2024-12-02T20:52:28Z")
[smsutin](https://forum.digikey.com/u/smsutin) Thank you for contacting DigiKey , sorry I am not finding any info with the part markings on that part . Thanks Craig ---
**Author:** ![rick\_1976](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/rick_1976/32/1571_2.png) [@rick\_1976](https://forum.digikey.com/u/rick_1976)\ **Post date:** [December 2, 2024, 9:48pm UTC](https://forum.digikey.com/t/identification-of-broad-component/46911/3 "2024-12-02T21:48:38Z")
Quite possibly an [optoisolator](https://www.digikey.com/en/products/filter/transistor-photovoltaic-output-optoisolators/903?s=N4IgTCBcDa4OwAYCsIC6BfIA). ---
**Author:** ![M3mmer](https://avatars.discourse-cdn.com/v4/letter/m/3e96dc/32.png) [@M3mmer](https://forum.digikey.com/u/M3mmer)\ **Post date:** [December 3, 2024, 3:07am UTC](https://forum.digikey.com/t/identification-of-broad-component/46911/4 "2024-12-03T03:07:26Z")
You are spot on. Based on the datasheet and component markings the 2705 is the component designation and 519R is the date code. Huge thank you. I have another component identification code request I will post shortly. ---
**Author:** ![M3mmer](https://avatars.discourse-cdn.com/v4/letter/m/3e96dc/32.png) [@M3mmer](https://forum.digikey.com/u/M3mmer)\ **Post date:** [December 3, 2024, 3:52am UTC](https://forum.digikey.com/t/identification-of-broad-component/46911/5 "2024-12-03T03:52:33Z")
Ok, thanks again for identifying my first component. Below is my second ID question. I think it’s a 2N80 MOSFET but there are several options by different manufacturers. I am hoping to get as close as possible to original. I butchered the gate and source pins but both are surface mount if that helps. Also I believe the markings are as follows: INOIAX (“I” could be a 1, and O can be a zero) FOD 2N80 There seems to be a logo in the top left that says “ON”. Looking forward to what y’all think. ![image](https://global.discourse-cdn.com/digikey/original/3X/d/2/d2df137256e4b619f8b92a60e917d1192f039d9c.jpeg) ![image](https://global.discourse-cdn.com/digikey/original/3X/1/7/1775a845b76de4cc70668e61688c360ae98b2a30.jpeg) ---
**Author:** ![Adam7](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/adam7/32/48093_2.png) [@Adam7](https://forum.digikey.com/u/Adam7)\ **Post date:** [December 3, 2024, 6:15am UTC](https://forum.digikey.com/t/identification-of-broad-component/46911/6 "2024-12-03T06:15:28Z")
Check this one - FQD2N80-FQU2N80 > **[FQD2N80, FQU2N80 Datasheet by ON Semiconductor | Digi-Key Electronics](https://www.digikey.com/htmldatasheets/production/1792549/0/0/1/fqd2n80-fqu2n80.html)** > > View datasheets for FQD2N80, FQU2N80 by ON Semiconductor and other related components here. ---
**Author:** ![jamesyn](https://avatars.discourse-cdn.com/v4/letter/j/8baadc/32.png) [@jamesyn](https://forum.digikey.com/u/jamesyn)\ **Post date:** [April 29, 2025, 2:17pm UTC](https://forum.digikey.com/t/identification-of-broad-component/46911/7 "2025-04-29T14:17:36Z")
may be ps2705-1 opto [https://www.mouser.com/datasheet/2/286/ps2705-28316.pdf?srsltid=AfmBOoqC2L5OPRyoT6\_bepYbVR0hXTP7OqAubReDeFaNSEVMGyZaq5fv](https://www.mouser.com/datasheet/2/286/ps2705-28316.pdf?srsltid=AfmBOoqC2L5OPRyoT6_bepYbVR0hXTP7OqAubReDeFaNSEVMGyZaq5fv) ---
**Author:** ![anthony\_14117](https://avatars.discourse-cdn.com/v4/letter/a/6a8cbe/32.png) [@anthony\_14117](https://forum.digikey.com/u/anthony_14117)\ **Post date:** [April 29, 2025, 2:32pm UTC](https://forum.digikey.com/t/identification-of-broad-component/46911/8 "2025-04-29T14:32:52Z")
here is the link to the [PS2705-1](https://www.digikey.com/en/products/detail/cel/PS2705-1/108308) on our site.