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Ferrite Bead symbol and reference designator

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bnoel View Drop Down
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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?
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Tom H View Drop Down
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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.

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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.

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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...
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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.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jun 2024 at 9:42am
Class Designation Letters for Reference Designations

A Separable Assembly

AR Amplifier

AT Attenuator; Isolator

B Blower, Motor

BT Battery

C Capacitor

CB Circuit Breaker

CP Connector Adapter, Coupling

CN Capacitor Network

CR Breakdown Diode

D Diode

DC Directional Coupler

DL Delay Line

DS Display, Lamp

E Terminal

F Fuse

FD* Fiducial

FL Filter

G Generator, Oscillator

GN General Network

H Hardware

HY Circulator

J Connector, Jack, Female

K Contactor, Relay

L Coil, Inductor, Bead, Ferrite Bead

LS Loudspeaker, Buzzer

M    Meter

MG Motor-Generator

MH* Mounting Hole

MK Microphone

Q Transistor

MP Mechanical Part

P Connector, Plug, Male

PS Power Supply

R Resistor

RN Resistor Network

RT Thermistor

RV Varistor, Variable Resistor

S Switch

TZ Transzorb

T Transformer

TB Terminal Board, Terminal Strip

TC Thermocouple

TP** Test Point, In-circuit Test Points

U Inseparable Assembly, IC Pkg

VR Voltage Regulator

W Wire, Cable, Cable Assembly

X Fuse holder, Lamp holder, Socket

Y Crystal, Oscillator

Z Miscellaneous

*These class letters would not appear in a parts list as they are part of a PCB and not an active electronic component.

**Not a class letter, but commonly used to designate test points for maintenance purposes. 

Note: The above list is not exhaustive. See the standard list of class designation letters in ANSI Y32.2/IEEE Std. 315, Section 22 and the Index.


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