# Advanced Photonix Photodiode "F" Suffix Meaning

**URL:** <https://forum.digikey.com/t/advanced-photonix-photodiode-f-suffix-meaning/13748>\
**Category:** Sensors Transducers\
**Tags:** part-numbering, advanced-photonix\
**Created:** [April 20, 2021, 5:20am UTC](https://forum.digikey.com/t/advanced-photonix-photodiode-f-suffix-meaning/13748 "2021-04-20T05:20:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Kevin\_6462](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/kevin_6462/32/8856_2.png) [@Kevin\_6462](https://forum.digikey.com/u/Kevin_6462)\
**Post date:** [April 20, 2021, 5:20am UTC](https://forum.digikey.com/t/advanced-photonix-photodiode-f-suffix-meaning/13748/1 "2021-04-20T05:20:47Z")

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If you are looking at part numbers for photodiodes from [Advanced Photonix,](https://www.digikey.com/en/supplier-centers/advanced-photonix) you may see the suffix “F” at the end of your given part number.

This “F” suffix calls out the presence of a visible blocking filter.

 ![image](https://global.discourse-cdn.com/digikey/original/3X/b/2/b2ee46b44b4e89e62da055386e48e0433a6ff9fe.jpeg)

> **Applicable part numbers**
>
> PDB-C134F-ND  
> PDB-C158F-ND  
> PDB-C156F-ND  
> PDB-C134F  
> PDB-C158F  
> PDB-C156F