Board Details
Desired Board Quantity - The number of printed circuit boards (PCB’s)
that you would like to order
Total # of manufacturer part #’s – This is the total number of
different part numbers. Counting the lines on the Bill of Materials (BOM) should
give you this answer.
Example
|
Qty
|
Reference
|
Part
|
Footprint
|
Part #
|
|
2
|
C1,C4
|
10UF/25V
|
1206
|
587-1337-1-ND
|
|
2
|
C3,C2
|
0.01UF
|
0603
|
399-1091-1-ND
|
|
5
|
C5,C6,C8,C9
|
0.1UF
|
0603
|
490-1519-1-ND
|
|
1
|
C7
|
4.7UF
|
0603
|
PCC2318CT-ND
|
|
1
|
D1
|
CMS04
|
MFLAT
|
CMS04QCT-ND
|
The BOM above has 5 lines
There are 5 different part numbers
The Total # of manufacturers part #’s = 5
Double Sided SMT? – Select “yes” if there are surface mount components
on both sides of the circuit board. This is important because in most cases an additional
solder stencil must be purchased if there are parts on both sides. The circuit boards
will also have to pass through our assembly line twice.
Lead Free Processing – Selecting “yes” will prompt us to use lead
free solder. This is required for boards that must meet RoHS standards.
Lead free solder doesn’t make a PCB RoHS compliant because the components and board
must also meet the standard. Boards that aren’t assembled using lead free solder
cannot meet RoHS requirements. It is important that boards with non-RoHS components
NOT be assembled using lead free processing. In some cases non-RoHS components can
contaminate very expensive bulk solder supplies.
Components
SMT – This is the total number of parts that are a relatively low
technology. These components must have lead spacing that is greater then 20 mils.
Most discrete components such as resistors and capacitors fit into this category.
Also in this category are most surface mount diodes, transistors, FET’s and many
IC’s.
Example
Packages in this Category
1206
0805
0603
0402
SOT23
SOT23-6
SO-8
SOIC-8
SO-20
SOIC-20
SC-70
SMA
SMB
Fine Pitch – These components are mostly IC’s that have lead spacing
20 mil’s or less. This field also will contain many surface mount connectors like
the ones used for flex.
Example
Packages in this Category
TQFP with 15 mil lead spacing
Thru-Hole – These components have leads that go through holes in
the circuit board. Large capacitors, inductors, diodes, and connectors are likely
to be thru-hole parts. Many other types of components can be thru-hole and they
appear most often on older boards.
Example
Packages in this Category
DO-41
DIP-8
DIP-20
Axial
Radial
BGA/QFN/Leadless – These components make connection with the circuit
board without leads or beneath the component. They are primarily IC’s but chipscale
packages are currently being used for a wide variety of purposes including diodes,
transistors, FET’s, and ESD protection.
Prototype and Short Run
If desired number of boards is less then 100 the boards will be considered prototype
quantities. Orders for more then 100 boards are in the short run category. A different
set of price breaks are used for these two categories. Significant savings can be
realized on future short run orders by asking Horizon Printed Circuits to save your
files and tools. This option can be selected during the ordering process.