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What is NC mentioned as a value of Component?

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chirag2239

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Hi,

Here I have attached two images. IN the first image, I have doubt that some capacitor has no value and the name "NC" is to be seem instead of its value.
Where in second image, some components are also have same problem that they do not have values but instead of its value, "DNP" is written. Other is FIDUCIAL-1X2, what is this? I need to order this component from online so I need to be clear about its meaning and package and value as well.
So can anyone help me to make clear about what is the meaning of DNP and NC? What should we consider as NC and DNP, Fiducial?
For the second image you have to consider the following BOM :

Partlist exported from C:/Users/admin/Downloads/CC3000_WiFi_Breakout/CC3000_WiFi_Breakout.sch at 07-01-2015 11:19:42

Part Value Device Package Description
AE1 ANTENNA22500AT44M0400 ANTENNA22500AT44M0400 ANTENNA-CHIP_2500AT44M0400 Chip antenna
C1 10uF CAP0805 0805 Capacitor
C2 10uF CAP0805 0805 Capacitor
C3 0.1uF CAP0603-CAP 0603-CAP Capacitor
C4 1uF CAP0805 0805 Capacitor
C5 1uF CAP0805 0805 Capacitor
C6 10pF CAP0603-CAP 0603-CAP Capacitor
C7 2.2pF CAP0603-CAP 0603-CAP Capacitor
C8 DNP CAP0603-CAP 0603-CAP Capacitor
D1 GREEN LED-GREEN0603 LED-0603 Various green LEDs
FID1 FIDUCIAL1X2 FIDUCIAL1X2 FIDUCIAL-1X2 Fiducial Alignment Points
FID2 FIDUCIAL1X2 FIDUCIAL1X2 FIDUCIAL-1X2 Fiducial Alignment Points
FRAME1 FRAME-LETTER FRAME-LETTER CREATIVE_COMMONS Schematic Frame
J1 U.FL U.FL U.FL SMD antenna connector- WRL-09144
JP1 Debug M03PTH 1X03 Header 3
JP2 M09 M09 1X09 Header 9
L1 DNP INDUCTOR0603 0603 Inductors
L2 2.2nH INDUCTOR0603 0603 Inductors
LOGO1 OSHW-LOGOS OSHW-LOGOS OSHW-LOGO-S Open Source Hardware Logo This logo indicates the piece of hardware it is found on incorporates a OSHW license and/or adheres to the definition of open source hardware found here: http://freedomdefined.org/OSHW
LOGO3 LOGO-SFESK LOGO-SFESK SFE-LOGO-FLAME Spark Fun Electronics PCB Logo
LOGO4 SFE_LOGO_NAME_FLAME.1_INCH SFE_LOGO_NAME_FLAME.1_INCH SFE_LOGO_NAME_FLAME_.1 SFE Logo, name and flame
R1 240 RESISTOR0603 0603-RES Resistor
R2 390 RESISTOR0603 0603-RES Resistor
R3 390 RESISTOR0603-RES 0603-RES Resistor
R4 10k RESISTOR0603-RES 0603-RES Resistor
SJ1 Mode SOLDERJUMPER_2WAYPASTE1&2 SJ_3_PASTE1&2 Solder Jumper
STANDOFF1 STAND-OFF STAND-OFF STAND-OFF #4 Stand Off
STANDOFF2 STAND-OFF STAND-OFF STAND-OFF #4 Stand Off
U1 LM1117 V_REG_LM1117SOT223 SOT223 Voltage Regulator LM1117
U3 74HC4050 HEX_CONVERTER SO016 Just what it says.
U5 CC3000 CC3000 QFN-46_CC3000 TI CC3000 WiFi Module
 

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A fiducial is an alignment mark on the PCB. Google it and you'll find there is a wiki page on it. They are there so a pick and place machine can have reference points on the board so it can use the offsets from them to place all the components.

DNP, I don't know but it might stand for Do Not Place. I usually see DNI (Do Not Install)

NC, No Connect? I have no clue what it means in the context of a capacitor's value.
 

Kick

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1. DNP means Do Not Populate,that component no need to solder on the board.
2. In the case of NC I have doubt,it may be No Component,No Connect or No Change from previous value.
3. Fiducial is not a component,its marking on the PCB.
 

chirag2239

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Hi,

Thanks for help but I am still confused that what will be the value of that DNP resistor in this case of circuit? Because if we are not going to mount them on a board, then definitely it will have some value. So can anyone let me know what will be the value of DNP resistor?
The DNP resistor is going to be connected to Loop Antenna. So is it for impedance matching?
Please guide me.

Thanks.
Chirag
 

Dan Mills

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DNP = Do not populate.
It is a footprint on the board that has nothing fitted to it (No component is installed).

Usually you design them in when you are trying to give yourself options, or to allow you to tweak things without having to get the board respun.

I would note that at 2.4GHz, pcb latout will have a huge effect on the required values in the matching network, so leaving yourself options is only sensable.

Regards, Dan.
 

marce

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The tuning components are to match the required feed to the actual PCB design, the no fits are there as back up.
 

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