PCB Libraries Forum Homepage
Forum Home Forum Home > Libraries > Schematic Symbols
  New Posts New Posts RSS Feed - Ferrite Bead symbol and reference designator
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Ferrite Bead symbol and reference designator
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
bnoel View Drop Down
Active User
Active User
Avatar

Joined: 14 Mar 2014
Location: Western NY
Status: Offline
Points: 14 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bnoel Quote  Post ReplyReply Direct Link To This Post Topic: Ferrite Bead symbol and reference designator
    Posted: 20 Dec 2017 at 8:29am
Hello,

I am seeing some conflicting information online regarding Ferrite Beads.  I see some documentation that shows the schematic symbol for a Ferrite Bead as an Inductor with a reference designator of L and other documentation that shows the symbol as in the inserted image with the reference designator of FB.  

What is the definitive symbol and ref des?
Back to Top
Tom H View Drop Down
Admin Group
Admin Group
Avatar

Joined: 05 Jan 2012
Location: San Diego, CA
Status: Offline
Points: 5547 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 20 Dec 2017 at 8:45am
Here is a list of common ref des for the past 30 years - 
 
They have the same electrical function:
 
"L" covers Inductors, Beads, Ferrite Beads,
Chokes, Common Mode Chokes and all parts related to the function of an electric
or electronic circuit that possesses inductance used in order to filter common
mode electromagnetic interference (EMI) currents without de-rating under high
currents and without causing signal degradation. Or, the geometry and
electromagnetic properties of coiled wire over the ferrite bead result in an
impedance for high-frequency signals, attenuating high frequency EMI/RFI
electronic noise.

I guess you can use FB for Ferrite Bead. Sounds good to me.
Stay connected - follow us! Twitter - LinkedIn
Back to Top
tgrodnicki View Drop Down
Advanced User
Advanced User


Joined: 30 Sep 2014
Status: Offline
Points: 99 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tgrodnicki Quote  Post ReplyReply Direct Link To This Post Posted: 21 Dec 2017 at 12:28am
Originally posted by Tom H Tom H wrote:

Here is a list of common ref des for the past 30 years - 
"Error 404: Page was Moved!"

In document from 2004 created by PCB Libraries and titled Standard Reference Designators "FB" stands for Ferrite Bead.
I followed standard from this publication.

In document from 2009 created by PCB Matrix and tltled IPC-7351B Naming Convention for Standard SMT Land Patterns in section PCB Matrix Naming Convention for Non-Standard SMT Land Patterns land pattern name for Ferrite Beads is FB_Mfr.'s Part Number.

Current version of lattter document does not have section for non-standard patterns.
Back to Top
Nick B View Drop Down
Admin Group
Admin Group


Joined: 02 Jan 2012
Status: Offline
Points: 1878 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Nick B Quote  Post ReplyReply Direct Link To This Post Posted: 21 Dec 2017 at 2:26am
I don't know where the temporary link came from, but I modified Tom's post with the proper link.
Please try again...
Stay connected - follow us! Twitter - LinkedIn
Back to Top
LarryJoy View Drop Down
Active User
Active User


Joined: 08 Jul 2018
Status: Offline
Points: 31 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LarryJoy Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug 2018 at 2:29am
The IEC 60617 graphic symbol for a Ferrite Bead is shown in IEEE 315A, Clause 6.2.11 as follows:

In addition the class letter to use in a ref des is E. See IEEE 315, Clause 22.4.
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.063 seconds.