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  • Ipc-sm-840c - Etag Co

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The Institute for Interconnecting IPCSM840C and Packaging Electronic Circuits Qualication and Performance of Permanent Solder Mask IPCSM840C January 1996 Supersedes IPCSM840B May 1988 A standard developed.

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Other good rules when it comes to solder mask include: Meet minimum annular ring requirements if the solder resist encroaches on lands. Don't allow exposed isolated pads. Permit solder resist only when plated through holes not intended for solder fill. Don't let solder resist on test points or connector fingers.

Solder mask thickness as per IPC–SM-840D is minimum 0.001" [0.025mm]. So, the solder mask is at least 25 microns. Ni+Au will be 3.05 microns minimum. With ENIG (Electroless Nickel Immersion Gold) plating, solder mask will be always above the contact pad area.

Here are the four PCB solder mask types: Liquid epoxy solder mask. Liquid photoimageable solder mask (LPSM) Dry Film Solder Mask (DFSM)

IPC-SM-840 : Qualification and Performance Specification of Permanent Solder Mask and Flexible Cover Materials.

1 Dielectric Strength The solder mask material shall meet or exceed the minimum value of 500 VDC per 25 µm [0.001 in] of thickness when tested in ance with IPC-TM-650, Method 2.5. 6.1. Thickness of solder mask less than 25 µm [0.001 in] shall meet an absolute minimum breakdown voltage of 500 VDC.”

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© Copyright 1997-2025
airSlate Legal Forms, Inc.
3720 Flowood Dr, Flowood, Mississippi 39232
Form Packages
Adoption
Bankruptcy
Contractors
Divorce
Home Sales
Employment
Identity Theft
Incorporation
Landlord Tenant
Living Trust
Name Change
Personal Planning
Small Business
Wills & Estates
Packages A-Z
Form Categories
Affidavits
Bankruptcy
Bill of Sale
Corporate - LLC
Divorce
Employment
Identity Theft
Internet Technology
Landlord Tenant
Living Wills
Name Change
Power of Attorney
Real Estate
Small Estates
Wills
All Forms
Forms A-Z
Form Library
Customer Service
Terms of Service
Privacy Notice
Legal Hub
Content Takedown Policy
Bug Bounty Program
About Us
Blog
Affiliates
Contact Us
Delete My Account
Site Map
Industries
Forms in Spanish
Localized Forms
State-specific Forms
Forms Kit
Legal Guides
Real Estate Handbook
All Guides
Prepared for You
Notarize
Incorporation services
Our Customers
For Consumers
For Small Business
For Attorneys
Our Sites
US Legal Forms
USLegal
FormsPass
pdfFiller
signNow
airSlate WorkFlow
DocHub
Instapage
Social Media
Call us now toll free:
+1 833 426 79 33
As seen in:
  • USA Today logo picture
  • CBC News logo picture
  • LA Times logo picture
  • The Washington Post logo picture
  • AP logo picture
  • Forbes logo picture
© Copyright 1997-2025
airSlate Legal Forms, Inc.
3720 Flowood Dr, Flowood, Mississippi 39232