IPC-A-610C(电子组装件的验收条件) - 第362页
Standard Improvement Form IPC-A-610C The purpose of this form is to provide the T echnical Committee of IPC with input from the industry regarding usage of the subject standard. Individuals or companies are invited to su…
IPC-2221 –
6.3.2 B2-External Conductors, Uncoated,
Sea Level to 3050 m
Electrical clearance requirements for
uncoated external conductors are significantly greater than for
conductors that will be protected from external contaminants
with conformal coating. If the assembled end product is not
intended to be conformally coated, the bare board conductor
spacing shall require the spacing specified in this category for
applications from sea level to an elevation of 3050 m. See
Table 6-1.
IPC-2221 –
6.3.3 B3-External Conductors, Uncoated,
Over 3050 m
External conductors on uncoated bare board
applications over 3050 m require even greater electrical spac-
ings than those identified in category B2. See Table 6-1.
IPC-2221 –
6.3.4 B4-External Conductors, with Perma-
nent Polymer Coating (Any Elevation)
When the final
assembled board will not be conformally coated, a permanent
polymer coating over the conductors on the bare board will
allow for conductor spacings less than that of the uncoated
boards defined by category B2 and B3. The assembly electri-
cal clearances of lands and leads that are not conformally
coated require the electrical clearance requirements stated in
category A6 (see Table 6-1). This configuration is not appli-
cable for any application requiring protection from harsh,
humid, contaminated environments.
Typical applications are computers, office equipment, and
communication equipment, bare boards operating in con-
trolled environments in which the bare boards have a perma-
nent polymer coating on both sides. After they are assembled
and soldered the boards are not conformal coated, leaving
the solder joint and soldered land uncoated.
Note: All conductors, except for soldering lands, must be
completely coated in order to ensure the electrical clearance
requirements in this category for coated conductors.
IPC-2221 –
6.3.5 A5-External Conductors, with Confor-
mal Coating Over Assembly (Any Elevation)
Externalcon-
ductors that are intended to be conformal coated in the final
assembled configuration, for applications at any elevation, will
require the electrical clearances specified in this category.
Typical applications are military products where the entire final
assembly will be conformal coated. Permanent polymer coat-
ings are not normally used, except for possible use as a sol-
der resist. However, the compatibility of polymer coating and
conformal coating must be considered, if used in combina-
tion.
IPC-2221 –
6.3.6 A6-External Component Lead/
Termination, Uncoated
External component leads and ter-
minations, that are not conformal coated, require electrical
clearances stated in this category.
Typical applications are as previously stated in category B4.
The B4/A6 combination is most commonly used in commer-
cial, non-harsh environment applications in order to obtain the
benefit of high conductor density protected with permanent
polymer coating (also solder resist), or where the accessibility
to components for rework and repair is not required.
IPC-2221 –
6.3.7 A7-External Component Lead/
Termination, with Conformal Coating (Any Elevation)
As
in exposed conductors versus coated conductors on bare
board, the electrical clearances used on coated component
leads and terminations are less than for uncoated leads and
terminations.
Appendix A
Electrical Conductor Spacing (cont.)
A-2 IPC-A-610CJanuary 2000
Standard Improvement Form IPC-A-610C
The purpose of this form is to provide the
Technical Committee of IPC with input
from the industry regarding usage of
the subject standard.
Individuals or companies are invited to
submit comments to IPC. All comments
will be collected and dispersed to the
appropriate committee(s).
If you can provide input, please complete
this form and return to:
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ASSOCIATION CONNECTING
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®
ANSI/IPC-T-50 Terms and Definitions for
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