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Questions tagged [ipc]

IPC, the Association Connecting Electronics Industries, is a trade association whose aim is to standardize the assembly and production requirements of electronic equipment and assemblies.

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How do PCB trace width calculators find the coefficients from the IPC-2221?

PCB trace width calculators like this one and many others like it always quote at the bottom something like this, For IPC-2221 internal layers: k = 0.024, b = 0.44, c = 0.725 For IPC-2221 external ...
verpas's user avatar
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4 votes
2 answers
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Why does IPC 2221 require so much more spacing at elevation?

In the IPC 2221 is a table that specifies the required trace spacing. One thing that I find very surprising is the jump once the elevation is above 3050m. E.g. For an external conductor (uncoated) at ...
Lucas's user avatar
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Which method can be used to properly fill a via-in-pad by hand?

Assume that you have a via hole inside a pad. Which method can be used to properly fill a via-in-pad by hand so it will be equal or similar as the protection of vias according to IPC 4761? Which ...
euraad's user avatar
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1 vote
1 answer
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IPC 7251 annular ring meaning

When looking at IPC-7251 Table 3-3 (see the table in Sergei Gorbikov's answer at How to determine annular ring width for thru-hole pads?), for a through-hole pad in Level B the annular ring is given ...
John Arg's user avatar
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What IPC standard guides on the design of through hole PCB pads?

Through hole PCB pads need an annular ring and will have other details like the solder mask clearance. For pad that shall be used to solder component leads, I believe that there is some IPC guidance ...
quantum231's user avatar
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1 answer
152 views

Altium hole tolerance vs IPC hole tolerance

I would like to start using the hole tolerances in Altium to provide more information to my fab house. What I'm trying to figure out is the interaction with the IPC fabrication allowances I have ...
Kontakt's user avatar
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1 vote
1 answer
359 views

Where can I find information about "Enhanced Policies and Procedures Exam" for IPC?

I'm taking the CSE test for IPC-J-STD-001 and at chapter 7.Certification Exam Overview, I can see that there are 3 types of tests. Policy and procedure test (10 questions) Closed book test (25 ...
euraad's user avatar
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Soldering a Reed switch upside down into a slot

I would like to solder Coto reed switch CT10-2540-G1 upside down into a slot. It would recede into the slot until the tips of the lead touched the pads. Is there an IPC standard regarding the minimum ...
Kaari_layout's user avatar
1 vote
3 answers
2k views

Should I use heat shrink tubing on solder connectors? [closed]

I learned soldering after IPC-J-STD-001 E during my apprenticeship 10 years ago and my instructor told me that you don't use heat shrink tubing on connectors, but recently I've seen a lot of this and ...
Darkproduct's user avatar
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How can I set clearance based on IPC-2221?

Below are two pictures. The first picture is from IPC-2221. I made the second picture. Which categories do the L1, L2, L3 and L4 clearances in the second picture belong to in the first picture at 310 ...
johny adv's user avatar
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IPC standards to ask manufacturer to assure a PCBA is correctly manufactured?

I'm preparing all the documentation to send to my PCBA manufacturing supplier and I wonder if there's a list of IPC standards to include in this documentation and verify they are compliant to them and ...
LazyTurtle's user avatar
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If a PCB is inspected to an IPC-A-600 class higher than specified what are the negative impacts?

I have received several parts from a PCB manufacturer which should have been inspected to IPC-A-600 Class 2 but were instead inspected to IPC-A-600 Class 3. I believe I have received PCBs inspected to ...
313Ctron's user avatar
1 vote
1 answer
602 views

IPC-B-25A test board schematic

I need to design an IPC-B-25A IPC multipurpose test board. I have only following board image. Board features are below: Solder mask - None FR4 Tg=175°C Size - 4"x4.5" (10x11.4cm) Thickness ...
MightyBeard007's user avatar
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Do Professional Manufacturers Violate IPC Standards?

I lay out simple boards using BGA packages and often ignore my EDA tool's courtyards. I know these courtyards are set by IPC standards to allow for good design, but then I look at boards like the ...
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229 views

Intertrack spacing and decoupling cap package for high voltage buck regulator

We're routing a PCB for a LM5085 buck controller of 8 pin WSON package with a maximum input of 75V. My questions are for the relatively high input voltage 0603 is the smallest input decoupling cap I ...
EarthLord's user avatar
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PCB trace height to width ratio

I came across the Isola IsoStack website that lets me test PCB stack-up using Isola substrates: https://www.isola-group.com/isostack My project is using a stripline design with a 1oz copper inner ...
BrChan's user avatar
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Which standard is used to inspect stranded cables secured to PCBA with RTV?

Does some one know what standard can be use for quality inspection on a PCBA that have stranded wires soldered and fixed with RTV? I check the IPC-A-610 Rev E and the most similar criteria, is in the ...
Juan Quintana's user avatar
1 vote
1 answer
130 views

How in-depth is the IPC "Introduction to Printed Circuit Design" course?

I'm looking into courses to progress from autodidactic hobby-level PCB design. IPC is offering an "Introduction to PCB design" course. How well does the course cover the standards? IPC-222x, IPC-7x51,...
Jostikas's user avatar
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2 answers
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IPC7351-B confused with mils and mm

We have started to incorporate the IPC7351B standard in our design. We use mils for our layouts. For Example consider part RC0603JR-070RL. As per IPC7351B, In mm RESC1607X60N and in mils ...
MightyBeard007's user avatar
7 votes
1 answer
1k views

Which IPC standard we should follow?

Our PCB designing team is of 5 members and we want to incorporate IPC standards in our designs from now on. We deal with a single-sided layer to 18 layers of PCB. We are into digital, analog, RF and ...
MightyBeard007's user avatar
2 votes
2 answers
224 views

Altium IPC Footprint wizard Generating Dodgy Components

I've started using Altium Designer 14 after a break and needed to build some components I started with a EP4CE10 FPGA, but I noticed that despite following the component guidelines as close as ...
Arnold Hucks's user avatar
1 vote
2 answers
136 views

Reflow soldering, pin longer than pad?

I was designing the footprint for this FPC connector: Datasheet The recommended land pattern is shown here: The issue I encountered is that the pins on one side protrude outside of the pad: I ...
Wesley Lee's user avatar
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13 votes
2 answers
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‘One for all’ standardized land pattern v.s. specified land pattern in datasheet

I’ve designed lot of ‘simple’ PCBs for hobby and proof-of-concept purposes, but never for (mass)manufacturing. In order to do so in the future, and further expanding my design skills and knowledge, I’...
Julien Roels's user avatar
6 votes
2 answers
879 views

High Voltage Capacitor Lead Clearance

I am designing a high voltage board, 10,000 VDC. I wish to use a suitably rated capacitor such as the DHR4E4A102K2BB. When I have been studying the ...
tomdertech's user avatar
4 votes
2 answers
190 views

Surface Mount package standards guide?

Is there a universal guide-line for the mechanical dimensions and tolerances of Surface Mount packages across the industry? I'm very new to SMT machine programming (<1 year), so I've been trying ...
Nick Wilcox's user avatar
11 votes
1 answer
656 views

Do I need to supply IPC documents to PCB fab house?

I would like to have a PCB design manufactured and plated with an ENEPIG finish. I have found a fab house that states they can perform ENEPIG finish and their site lists the plating option as one that ...
cjswish's user avatar
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1 vote
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PTH drill diameter do the IPC take the pin distance in account?

I wonder if the IPC take the Pin distance tolerance in account for the drill diameter? (see p in pic). I can't find any guidelines for it anywhere. Or is it just so that it's implicitly,common sense ...
user103776's user avatar
1 vote
2 answers
1k views

SOT23-3 Pin out: IPC or Datasheet?

IPC-7351 gives a pin out and a 0 degree rotation for SOT23-3 packages; but, IC vendors use many different pin numberings. When I make my library component should I use the IPC pin numbering for all ...
PaulB's user avatar
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9 votes
1 answer
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Why do KiCad's library footprints for 0402 resistors and capacitors have different pad sizes? [duplicate]

KiCad's default library footprint for C_0402 is longer than R_0402. Why?
pericynthion's user avatar
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8 votes
3 answers
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IPC Specification for pad width vs. pin width (SMD)

I am working on a board that has a fine-pitch component (0.35mm). Each pin is 0.15mm wide. I received a question from the manufacturer asking if they could adjust the pad width from 0.22mm to 0.18mm +/...
DerStrom8's user avatar
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0 votes
2 answers
163 views

Angle of wiring

I´m relativ new to PCB designing and therefore I have two questions. I started to design a simple 1-Layer PCB with a circular shape. In the Internet I found that a wire must not be "too long" ...
sofiane1925's user avatar
1 vote
2 answers
4k views

Which IPC standard provides land pattern dimensions?

This answer says it's IPC-7351, but I'm not seeing anything about land pattern dimensions in the table of contents. I'm wanting to make footprints in Altium and I found the IPC Compliant Footprint ...
Nate's user avatar
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3 votes
1 answer
4k views

Definitive land pattern for 0603 SMD capacitors?

So, I am trying to figure out what pad size to use for 0603 (imperial) SMD capacitors. The datasheet for the particular capacitors I plan to use provides part dimensions but does not recommend a land ...
Andrei's user avatar
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7 votes
2 answers
14k views

Why there is IPC Level A and B?

Why there are IPC footprint Levels A and B? I believe it has to do with the standard related to tape and reel feeding, but I will appreciate a more elaborated answer.
mFeinstein's user avatar
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