01 SMD Training_TIM Flashcards
1
Q
Definitions and terms
- SMT
- SMD
A
- SMT and SMD are sometimes used interchangeably
but they are actually distinct. - SMD (Surface mount device) is the name we give to
any component that would be placed directly on top
of a PCB (Printed Circuit Board) - SMT (Surface mount technology) is the name we
give to the equipment that would place the SMD on
the PCB.
2
Q
Def Chicken Feed
A
3
Q
Definitions and Terms
- SMD Resistors
- Surface Mount resistor Networks
A
4
Q
Definitions and Terms
- Ceramic Capacitors
- Surface Moint Tantalum Capacitors
A
5
Q
Definition & Terms
- MELF (Metal electrode leadless face)
- Leadless Ceramic Chip Carriers
A
6
Q
Defintion & Terms
- small outline transistors (SOT)
- Small outline integrated circuit (SOIC)
A
7
Q
Defintion & Terms
- Fine Pitch SMD packages (QFD, SQFP)
- ball grid Array (BGA) SMD Components
A
8
Q
Defintion & Terms
- Printed Circuit Board (PCB)
- PCB Panel
A
9
Q
Defintion & Terms
- Solder Paste Stencil
- Solder Paste Inspector (SPI)
A
10
Q
Defintion & Terms
- SMD pick and place Reel
- pick and place machine (SPI)
A
11
Q
Defintion & Terms
- reflow oven
- automatic optical inspection machine (AOI)
A
12
Q
Definition & Terms
XRay
A
13
Q
Starting in the Warehouse main topics of inspection
- How does the inbound inspection laboratory look?
A
- Can the measurement of critical component parameters be measured?
- Is there a microscope for checking physical damage?
- Are there basic electronic measurement equipment that could be used to sort out good and bad
components?
14
Q
Starting in the Warehouse main topics of inspection
- How does the release process work?
A
- Where do the parts go before they are released? (Can they be mixed with released parts?)
- How does the FIFO process work?
- Are there locations to corretly evaluate parts with Moisture Sensitivity Requirements?
15
Q
Starting in the Warehouse main topics of inspection
- How is the warehouse management maintained?
A
- Are there environmental control systems for the warehouse?
- Are the environmental control systems monitored and values stored?
- How does the place look overall, are things stored orderly or haphazardly overall, what is your gut
feeling of the 5S conditions of the warehouse
16
Q
Assembly
Traceability
A
Traceability
- How do the PCBs get marked? (Normal process is a Laser engraved DMC code)
- How do the SMD components get logged and prepared for the Assembly line?
17
Q
Assembly
Checks for PCB Label marking
A
- How does the coding system work?
- How is the supplier sure that no duplicates are made?
- Is the supplier reading the DMC code or just checking for readability?
18
Q
Assembly
Solder Paste Application
A
- How are the solder paste stencils maintained?
- How are the solder paste stencils stored?
- How is the FIFO Process for the Solder Paste maintained?
- How is the storage temperature for the Solder Paste controlled?
19
Q
Assembly
SPI
A
- What are the capabilities of the SPI, height, placement?
- How is the SPI program linked to the correct product?
- Who can make parameters changes to the inspection program?
20
Q
Assembly
Pick and Place
A
- Which assembly lines are able to produce our parts?
- What are the critical pieces of equipment, how long does it take for replacements to arrive?
- How are these machines calibrated and inspected? How often? Are they up to date?
21
Q
Assembly
Reflow
A
- Request a temperature profile from some arbitrary point in the last few weeks or months.
(Check their record keeping ability and acceptance criteria) - How often do they check the temperatures of the oven chambers
- How did the calibrate the temperature profile for the particular product you are auditing?
- Who approves the temperature profiles? How were they trained?
22
Q
Assembly
AOI
A
- The Start of a production needs to be released by using good and bad samples, are these
samples physical or a series of images used to test the algorithms. In the case of images does
the supplier have the buy off from the AOI supplier. - What is the pass yield goals of the supplier, and how do they work toward them?
23
Q
Assembly
Manual Inspection
A
- How does the failures identified from the AOI get transferred to the manual inspection. (How do
they know what to look for, to make sure they are repairing the right things if needed) - What equipment do they have? Is it calibrated and checked regularly?
- What is the process for escalation if repeated failures are identified?
24
Q
Assembly
Rework Station
A
- What certification do people have to do rework?
- What components are allowed to be reworked?
- What is the recheck process after rework?
25
Important information regarding the traceability
Traceability It is the requirement of Hilti to have full
traceability for every component used in our
components. The goal scenario for Hilti is to be able
to give a completed electronic serial number to the
supplier with a defect component, and for the
supplier to tell Hilti the serial number of every
electronic that uses components from the same
production.
Ask for a part with a serial number.
Find an interesting SMD component.
Then ask for all other serial numbers that were
produced with components from the same reel.
26
Important information regarding the reflow
Reflow Hilti requires suppliers to be IPC A 610 class 2 compliant. It
is important to be well read with this document. The supplier's
quality department should also be well read and understand this
document. It is a bad sign if they don’t have the most up to date
version of this document available.
It is important to check the failure history of defects detected by the
AOI. Are the same failures coming up again and again?
Learn how to read a temperature profile and make sure that there
are no deviations, make the supplier prove to you that the
components are reaching a high enough temperature to turn the
solder paste liquid.
27
Imporant information regarding the AOI
AOI All Hilti Suppliers are required to have an AOI.
Make sure that supplier has good AND bad samples
of some variant. Press them to see how they
choose the errors, are all error types represented?
If the machine can read SMD labels, is an incorrect
label part of the bad sample?
How can the supplier ensure that the good and bad
sample were used to start a production? Is there a
time out that requires the good and bad serial
numbers to be tested?
How are the failures logged and evaluated? How
many failures of the same type are allowed before
escalation?
28
Important Information regarding BGA/Large face Transisitors
