The Alphabet soup of IPC Specifications - SMTAs-SMTA_2014.pdf · Remove conformal coating ... inspection criterion ... Pop quiz: This laminate imperfection meets which class requirements?

The Alphabet soup of

IPC Specifications

340 Raleigh Street

Holly Springs, NC 27540

http://www.circuittechnology.com

(919) 552 3434

About the IPC

� IPC-the electronics industry standard

�Founded in 1957 as the “Institute of Printed

Circuits”

�Lobbying, research, standards developement

�Relevant/current training for electronics

companies that make them more competitive

in the global market

�“Portable” certification that is a marketable

skill for the individual

�Replacing most military spec’s

The first IPC meeting-1957

PCB Assembly Specifications:

� IPC-7711/7721B

� IPC-A- 610E

� IPC/WHMA-A-620B

� IPC-J-STD-001E

� IPC-A-600H

� All are available in a CIS and a CIT level

� All differentiate class 1, 2, 3 and Space

IPC 7711/7721

� Rework and Repair of PCB’s

� Operator course modularized

� Lead Free Criteria included

� 90% hands-on component removal,

replacement and laminate repair

7711/7721 Modules

� 1-Common procedures

� 2-Wire splicing

� 3-TH rework

� 4-SMT chip and MELF soldering & removal

� 5-SOT & SOIC soldering & removal

� 6-PLCC & QFP soldering & removal (0.020”)

� 7-PCB repair (TH & SMT surface)

� 8-Conformal coat repair

� 9-PCB repair(internal)

Procedures of IPC-7711B Removal

� Procedure 3.3.1, Chip Component Removal -

Bifurcated Tip

� Procedure 3.3.2, Chip Component Removal -

Tweezer Method

� 3.3.3, Chip Component Removal - Procedure

Hot Air Method

3.3.1 Chip Component Removal –

Bifurcated Tip

Figure 1: Apply Flux Figure 2: Tin Tips Figure 3: Position

Tip

Figure 4: Melt All

Joints

Figure 5: Lift

Component

EQUIPMENT REQUIRED

Soldering system

Chip removal tip

Soldering handpiece

OPTIONAL EQUIPMENT

Tweezers

Controllable preheater

MATERIALS

Flux-cored solder

Flux

Cleaner

Product Class: R,F,W,C

Skill Level: Intermediate

Level of Conformance: High

� PROCEDURE

� 1. Remove conformal coating (if any) and clean work area of any

� contamination, oxides or residues.

� 2. Install the chip removal tip into the soldering handpiece.

� 3. Start with tip temperature of approximately 315°C and change

� as necessary.

� 4. Apply flux to all lead/land areas. (See Figure 1.)

� 5. Remove old solder from tip and thermal shock with a damp

� sponge.

� 6. Apply solder to inside of tip forming a crown. (See Figure 2.)

� 7. Lower tip over component until tip contacts solder joints. (See

� Figure 3.)

� 8. Confirm solder melt and lift component from PWB. (See Figures

� 4 & 5.) (Surface tension of the tip should lift the component from

� the board. If this does not occur, use of tweezers to lift the

� component is optional.)




Procedure Continued:

NOTE: Chip components may have adhesive between the body and the board. If adhesive is used, it may be necessary to slightly turn the component to allow the component to be removed from the board. This must

only be accomplished after complete solder melt to prevent damage.

� 9. Release component from tip by wiping on a heat resistant

� surface.

� 10. Re-tin tip with solder.

� 11. Prepare lands for component replacement.




SMT drag solder video

IPC 610

� Workmanship standards and inspection criterion

� Accept / Reject criteria for all 3 classes

� No hands-on, all soft skills

� Operator (CIS) modularized

� Includes lead free criteria

610 Modules


� 2-Documents and handling

� 3-Hardware installation

� 4-Soldering

� 5-Terminal connections

� 6-PTH

� 7-SMT

� 8-Component damage and PCB assemblies

� 9-Solderless wire wrap

8.2.2.3 CHIP COMPONENTS

END JOINT WIDTH

© 2005, IPC, Bannockburn, IL All rights

reserved. For use only in IPC Training

Programs leading to Official IPC

Certification

Figure 8-20

Acceptable – Class 3

50% 75%50%5 Figure 8-19

Acceptable - Class 1, 2

Note Pass for 3side of the solder

fillet.

Note Pass for 1&2owest side of the

solder fillet.


END JOINT WIDTH




Certification

Figure 8-22


SIDE JOINT LENGTH




Certification

Figure 8-23

Target – Class 1, 2, 3

Note 3. Wetting is evident.


MINIMUM FILLET HEIGHT




Certification

Figure 8-26

Acceptable – Class 1, 2, 3

Note 3. Wetting is evident.

Note 6. Designs with via in pad may

preclude meeting these criteria.

Solder acceptance criteria should be

defined between the user and the

manufacturer.

12.3 High Voltage - Insulation

Figure 12-11

Acceptable – Class 1, 2, 3

Figure 12-12

Defect – Class 1, 2, 3

12.1.1 High Voltage – Terminals –

Wires/Leads

Figure 12-4

Defect– Class 1, 2, 3Sharp edges. Incomplete coverage, icicles

Review Questions

1. A high voltage terminal with no evidence of sharp edges, solder points, icicles, inclusions or wire strands is ____________,

A. Target – Class 1,2,3

B. Acceptable – Class 1,Process Indicator 2, 3

C. Defect – Class 1,2,3

D. Process Indicator – Class 1, Defect –Class 2, 3

A, Page 12-2, Clause 12.1.1

IPC/WHMA-A-620A

� Requirements and Acceptance for

Cable and Wire Harness Assemblies

620 Modules

� 1-Policies and procedures

� 2-Crimp terminations

� 3-Soldered terminations

� 4-Connectorization

� 5-Splices

� 6-Marking & labeling

� 7-Coaxial and twinaxial cable assemblies

� 8-Solderless wire wrap

8.2.1 Crimped Splices - Barrel

(Please use poll to answer)

Target - Class 1,2,3

• Wire insulation is flush against end of barrel splice (A).

• Bare wire ends are flush with barrel splice, bellmouth is evident (B).

• Crimp is centered and properly formed to retain wires (C).

• Barrel splice is not cracked.

8.2.1 Crimped Splices - Barrel

Acceptable - Class 1,2,3

• Wire insulation gap is within two wire diameters (A).

• Bare wire end is less than flush, but is visible and included in crimp indentation (B).

• Crimp slightly offset but properly formed, bellmouth is evident (C).

• Barrel splice is not cracked.

• Does not violate minimum electrical clearance.

IPC J-STD-001

� Process Control-Materials, Methods and

Verification Criteria

� 80% book 20% hands-on

� Soldering thru hole, SMT, terminals and

wires-very general

� CIS Modularized

� Refers to J-002-006

J-Standard supporting Documents

� 002-Solderability requirements-terminals

� 003-Solderability requirements-PCB’s

� 004-Requirements for soldering flux

� 005-Requirements for solder paste

� 006-Requirements for solder alloys

� 020-MSD classifications

J Standard Modules


� 2-Wires and terminals

� 3-PTH

� 4-SMT

� 5-Inspection

� 6-Space addendum

Table 7-7 Flat, Ribbon, ‘‘L,’’ and Gull

Wing LeadsFeature Feature Feature Feature Dim. Dim. Dim. Dim. Class 1 Class 1 Class 1 Class 1 Class 2 Class 2 Class 2 Class 2 Class 3 Class 3 Class 3 Class 3

Maximum Side Overhang

A

50% (W) or 0.5 mm [0.02 in],

whichever is less; Note 1

25% (W) or 0.5 mm [0.02 in], whichever is

less; Note 1

Figure 7- 7

Note 1. Does not violate minimum electrical clearance.

Table 7-7 Flat, Ribbon, ‘‘L,’’ and Gull

Wing Leads

Feature Feature Feature Feature Dim. Dim. Dim. Dim. Class 1 Class 1 Class 1 Class 1 Class 2 Class 2 Class 2 Class 2 Class 3 Class 3 Class 3 Class 3

Minimum End Joint Width

C 50%(W) 75%(W)

Figure 7- 7

Gull Wing Installation

Figure 1: Position

Component

Figure 2: Tack Lead Figure 3: Flux

Leads

Figure 4: Fill Tip Figure 5: Solder

Component

M5-18

IPC-600

� Acceptability of printed boards

600 modules

� 1-Policies and procedures

� 2-Externally observable characteristics

� 3-Internally observable characteristics

� 4-Miscellaneous and cleanliness

� 5-Question and answer period

� 6-Exam and exam review

2.3.1 Measling

Microsectioning not required as this is an externally observable requirement

A

1, 2, 3

2.3.2 Crazing

Microsectioning not required as this is an externally observable requirement

T A 1, 2, 3 N

2.3.4 Foreign Inclusions

T

N

A 1, 2, 3

1.3 Example

� Delamination

� Some attributes have both externally

observable and internally observable

requirements.

M1-39

Pop quiz: This laminate imperfection meets

which class requirements?

A. Class 1, only

B. Classes 1 and 2

C. Classes 1, 2 and 3

D. None of the above

R2-40

Answer: DRef: 2.3.3

Delamination/Blisters

Question 2: The plated hole condition is

acceptable for which class(es) of product?

A. Class 1

B. Classes 1 and 2

C. Class 2

D. Classes 2 and 3

R2-41

Answer: ARef: 2.10.3 External Annular

Ring – Supported Holes

All spec’s are related

J standard

620610

7711 600

Other IPC documents

� DRM’s

� “The seven sins of soldering”

� J-0033-handling of MSD’s

� CH-65B-cleaning PCB’s

� 7525-Stencil design guidelines

� 7095-BGA’s

� T-50-Terms and definitions

� Many other documents, industry reports etc.

Why Invest in Training?

� Industry recognized certification to show

your dedication to quality

� Increase throughput and reliability

� May be required (mil, med, auto, ISO)

� Employee retention

� Increase first pass yield

� Decrease defects

� Enhance your bottom line

Key Resources

� www.circuittechnology.com

� www.smta.org

� www.ipc.org

� [email protected]