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SMTnet Express, December 29, 2022, Subscribers: 24,787, Companies: 11,688, Users: 27,655

█ Electronics Manufacturing Technical Articles

There is a smaller process window and a much narrower margin of error when creating and using lead-free reflow profiles for surface mount parts on printed circuit boards (PCBs). Solder balls, dewetting, tombstones, voids, and head-on-pillow problems will occur much more frequently because lead-free alloys behave differently than eutectic pastes. Problems are compounded due to the extra heat necessary for some lead-free pastes to reach their melting points.

Credit: ACI Technologies, Inc.

Head in Pillow X-ray Inspection at Flextronics

Manufacturing technology faces challenges with new packages/process when confronting the need for high yields. Identifying product defects associated with the manufacturing process is a critical part of electronics manufacturing. In this project, we focus on how to use AXI to identify BGA Head-in-Pillow (HIP), which is challenging for AXI testing. Our goal is to help us understand the capabilities of current AXI machines.

Credit: Flex (Flextronics International)

A PROCEDURE TO DETERMINE HEAD-IN-PILLOW DEFECT AND ANALYSIS OF CONTRIBUTING FACTORS

Head-in-Pillow (HIP) defects are a growing concern in the electronics industry. These defects are usually believed to be the result of several factors, individually or in combination. Some of the major contributing factors include: surface quality of the BGA spheres, activity of the paste flux, improper placement / misalignment of the components, a non-optimal reflow profile, and warpage of the components. To understand the role of each of these factors in producing head-in-pillow defects and to find ways to mitigate them, we have developed two in-house tests.

Credit: Cookson Electronics

A Study On Process, Strength And Microstructure Analysis Of Low Temperature SnBi Containing Solder Pastes Mixed With Lead-Free Solder Balls

As the traditional eutectic SnPb solder alloy has been outlawed, the electronic industry has almost completely transitioned to the lead-free solder alloys. The conventional SAC305 solder alloy used in lead-free electronic assembly has a high melting and processing temperature with a typical peak reflow temperature of 245°C which is almost 30°C higher than traditional eutectic SnPb reflow profile. Some of the drawbacks of this high melting and processing temperatures are yield loss due to component warpage which has an impact on solder joint formation like bridging, open defects, head on pillow.

Credit: Rochester Institute of Technology

Hidden Head-In-Pillow soldering failures

One of the upcoming reliability issues which is related to the lead-free solder introduction, are the headin-pillow solderability problems, mainly for BGA packages. These problems are due to excessive package warpage at reflow temperature. Both convex and concave warpage at reflow temperature can lead to the head-in-pillow problem where the solder paste and solder ball are in mechanical contact but not forming one uniform joint. With the thermo-Moire profile measurements, this paper explains for two flex BGA packages the head-in-pillow. Both local and global height differences higher than 100 um have been measured at solder reflow temperature. This can be sufficient to have no contact between the molten solder ball and solder paste. Finally, the impact of package drying is measured

Credit: IMEC

SEE Forum results for related keywords - head pillow -- 48

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█ Printed Circuit Board Assembly & PCB Design Forum

Dropped reel component guide lines -- Looking for guide line or rule of thumb to use in production if reel of component is dropped in production Both Active/Passive components Any study available? Example: Active: 30cm drop =Scrap Passive 60cm drop =scrap BR Fredrik

Partially completed PCBA Storage -- Hello, We use OSP-finished PCB. One component (transformer) will be delayed (approximately 4 months) to getting in our hands. We want to partially complete the PCBA (both SMT & MI) in the meantime and later insert the transformer upon arrival through manual soldering. Is there a problem in doing so? Any other suggestions are also appreciated. Thanks in advance. Happy Christmas to everyone.

SEARCH the PCB Assembly Forum VISIT the PCB Assembly Forum...

█ SMT, PCB Electronics Assembly Manufacturing Industry News

Industry Demand Holding Up Despite Deteriorating Economic Outlook, High Costs Continue to Create Challenging Conditions for Electronics Manufacturers

Industry Demand Holding Up Despite Deteriorating Economic Outlook, High Costs Continue to Create Challenging Conditions for Electronics Manufacturers...

Association Connecting Electronics Industries (IPC)

Wafer-Level Packaging Symposium (WLPS) Program Announced and Registration Now Open

The SMTA has announced the accepted speakers for the Wafer-Level Packaging Symposium (WLPS). The symposium will be held February 14-16, 2023 at the Marriott Fremont Silicon Valley in Fremont, California....

Surface Mount Technology Association (SMTA)

Count On Tools Introduces Hybrid Yamaha Compliant Nozzles

Count On Tools, Inc. (COT) is pleased to introduce Hybrid Yamaha Compliant Nozzles (P/N: 2013-1856)....

Count On Tools, Inc.

Count On Tools - Yamaha Compliant Nozzles

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█ SMT / PCB Products & Services

NEW SMT / PCB EQUIPMENT & SERVICES - For Sale

SELECTIVE SOLDERING

Pillarhouse Jade Handex

Pillarhouse USA

PCB INSPECTION

CoaXPress Industrial Camera

ISVI

PCB SOFTWARE

CELLS - MES & Tracking Software

Unisoft

REFLOW OVEN

Voidless / Vacuum Reflow Soldering Oven

Heller

Dispensing

Catalina Benchtop Dispense Robots

GPD Global

Inspection

I.C.T AOI Solution

I.C.T

VIEW More New Electronic Manufacturing Products...

█ SMT / PCB Assembly Equipment Auctions

Currently, no featured auctions are on SMTnet

VISIT the Assembly Equipment Auctions Calendar...

█ Electronic Equipment Mart

MART - Used Electronic Assembly Machines For Sale

SELECTIVE SOLDERING

Ersa Versaflow 3/45

Baja Bid - Ersa Versaflow 3/45

Baja Bid

PCB PRINTING

DEK NEOHORIZON 03iX

SMTUnion - DEK NEOHORIZON 03iX

SMTUnion

P&P / FEEDERS

Chroma Table Top Single Site Test Handler Model 3111

World Equipment Source - Chroma Table Top Single Site Test Handler Model 3111

World Equipment Source, LLC

P&P / FEEDERS

Panasonic NPM-W P&P

AllSurplus Panasonic NPM-W P&P

AllSurplus

P&P / Feeders

Assembleon AX201

KD Electronics - Assembleon AX201

KD Electronics

PCB INSPECTION

Viscom S3088 Ultra Chrome 3D AOI

Lewis & Clark Viscom S3088 AOI

Lewis & Clark

VIEW More Used Equipment For Sale... SEND a RFQ to Equipment Suppliers ....

MART - Used PCB Assembly Equipment Wanted To Buy

PCB TEST

Agilent 3070

Lewis & Clark Agilent 3070

Lewis & Clark

PCB TEST

Agilent 3070

KD Electronics Agilent 3070

KD Electronics

WIRE STRIPPERS

Autosplice SAS/2

Baja Bid - Autosplice SAS/2

Baja Bid

P&P / FEEDERS

Assembleon MG-1R

World Equipment Source Assembleon MG-1R

World Equipment Source, LLC

SEE Buyers' Used Assembly Equipment Wants

█ Electronics Manufacturing & Assembly Events Calendar

EVENTS

Pan Pacific Microelectronics Symposium | January 30 to February 2

SMTA

█ Electronics Manufacturing Training Courses & PCB Assembly Training

FIND TRAINING FOR:

IPC Certification

Soldering & Rework

PCB Design

Electronics Assembly

Electronics Inspection

Online Training

TRAINING - PCB Inspection Electronics Manufacturing Training Courses

IPC-A-640 Interactive PCB Inspection Lab (CIT or CIS Option)

Multiple dates and location. Check the link for details

EPTAC Corporation

TRAINING - PCB Rework and Hand Soldering Training Courses

Customizable Basic Hand Soldering

Arizona, Phoenix | Dec. 27 to Dec. 29, 2022

Colorado, Longmont | Dec. 29 to Dec. 30, 2022

Blackfox Training Institute, LLC

TRAINING - Online Electronics Manufacturing and Assembly Training Courses

IPC J-STD-001 Trainer (CIT) Certification Online Live Training Course

Online/On-Demand

EPTAC Corporation

Live Online Training - IPC/WHMA-A-620 Expert (CSE) Certification Training Course

Online/On-Demand

ACI Technologies, Inc.

Live Online Training - IPC/WHMA-A-620 Trainer (CIT) Certification Training Course

Online/On-Demand

ACI Technologies, Inc.

Live Online Training - IPC-A-610 (CIT) Recert.

Online/On-Demand

ACI Technologies, Inc.

Reflow Soldering 101 Training Course

Online/On-Demand

Surface Mount Technology Association (SMTA)

Selective wave soldering academy

Online/On-Demand

Pillarhouse USA

Online IPC-A-610 Trainer (CIT) Training & Certification

Online/On-Demand

Blackfox Training Institute, LLC

VISIT All Electronics Manufacturing Training Courses...

█ Electronics Manufacturing & PCB Assembly Jobs

CAREER CENTER - Job Needs & Wants

JOBS - POST your job openings now

Business Development Manager (REMOTE)

Minneapolis, Minnesota, USA

Spartronics

CEO

Shenzhen, China

Wiseinstrum Co., Ltd.

Engineer

Clamart, France

MICROPORT CRM SAS

Test Engineer

Watertown, South Dakota, USA

Spartronics

SMT Process Engineer

Watertown, South Dakota, USA

Spartronics

sales representative & distributor

Germany, U.S. Military - Overseas Europe, Germany

einnosys

Quality Inspector

Plaistow, New Hampshire, USA

Spartronics

Quality Engineer

Williamsport, Pennsylvania, USA

Spartronics

RESUMES - POST your resume now

Posiition: Engineering

Currrent Location: Jamui, India

Summary of Qualifications: Rank 1st Diploma Of Engineering In Electronics Engineering In 2022. Four weeks in-plant training at Patna.

Posiition: Quality Control

Currrent Location: Jamui, India

Summary of Qualifications: Rank 1st Diploma Of Engineering In Electronics Engineering In 2022. In-plant training at Patna.

POST your resume on SMTnet

FIND your next job now... FIND your next employee now...

█ PCB Design & Assembly Industry Associations

Surface Mount Technology Association (SMTA)

SMTA is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies.

Membership Info | SMTA Certification | Bookstore | Upcoming Events

Association Connecting Electronics Industries (IPC)

IPC is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly.

Membership Info | Training & Certification | Online Store | Upcoming Events

Editor - Dave "davef" Fish (submit your technical articles)

SMTnet.com, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.