# Looking for CTCSS Encoder/Decoder (eg FX465) **URL:** \ **Category:** Integrated Circuits (ICs)\ **Tags:** audio-special-purpose, cml-microcircuits, cross-reference\ **Created:** [October 24, 2021, 2:40am UTC](https://forum.digikey.com/t/looking-for-ctcss-encoder-decoder-eg-fx465/17447 "2021-10-24T02:40:49Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Samper](https://avatars.discourse-cdn.com/v4/letter/s/b3f665/32.png) [@Samper](https://forum.digikey.com/u/Samper)\ **Post date:** [October 24, 2021, 2:40am UTC](https://forum.digikey.com/t/looking-for-ctcss-encoder-decoder-eg-fx465/17447/1 "2021-10-24T02:40:49Z")
In the hobby of amateur radio, and many other radio applications, the use of inaudible tones like CTCSS help to route radio traffic through repeaters or to “call” individual radios in the field. I am looking for an IC that can handle both encoding/decoding of Continuous Tone Controlled Squelch System (CTCSS). I came across a couple of refs to the FX465, however could not find it listed within Digi Key: [https://www.cmlmicro.com/wp-content/uploads/2017/12/FX465\_ds.pdf](https://www.cmlmicro.com/wp-content/uploads/2017/12/FX465_ds.pdf) Any ideas for alternative IC’s or how I might be able to source the FC465 through Digi key to fit in my small valume order (maybe quantity of 2-4). Cheers ---
**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:** [October 26, 2021, 8:53pm UTC](https://forum.digikey.com/t/looking-for-ctcss-encoder-decoder-eg-fx465/17447/2 "2021-10-26T20:53:33Z")
Greetings, Per the [manufacturer’s website](https://www.cmlmicro.com/product-archive/), the FX465 device is obsolete though a number of suggested alternatives are available. The first of these at least was in stock at the time of inquiry. ![image](https://global.discourse-cdn.com/digikey/original/3X/1/7/17d4ca1521b92ac7c42a0e89fb32fcb4beda3ead.png)