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Ask Helena & Leo

Have a technical question? Dealing with a process or standards issue and not sure where to turn? *Helena and Leo, our technical experts are here to help.  Just fill out the form below and they will review and answer selected questions as soon as they can.

*Please Note: We may post your question on our site for educational purposes, so that others may learn in the process. All references, both personally, professional and relative to product details will be removed from the discussion.

PEM® Nut Soldering Criteria

Question: We have boards with PEM® nuts being soldered during production. Has IPC established minimum soldering criteria for SMT PEM®s?

Solder Flow Near Through-Hole Component Body

Question: We have a through-hole integrated circuit (IC) component that has good wetting when it goes through the wave soldering machine, and the solder climbs pretty far up the lead.

Maximum Limits of Solder Bath Contamination

Question: If we are using a solder pot to tin wires and create solder joints (splices), what Maximum Limits of Solder Bath Contaminant do we adhere to (IPC J-STD-001, table 3-1)? Preconditioning or Assembly? What exactly does Preconditioning mean in this context?

Defining Standard Industry Practices for Torque of Threaded Fasteners

Question: While reviewing IPC-A-610, Section 4.1.5.1 (Torque of Threaded Fasteners), the question of “what is the standard industry practice” came up. I checked several reference documents like IPC-AJ-820 but found nothing that explained this to any length. Can you explain what the “standard industry practice” is?

J-STD-001F 4.5.1 Gold Removal Class 2 Requirement Changed

Question: Why did the IPC make the gold removal requirement for Class 2 products a requirement (D2D3) when in Rev E of J-STD-001 it was a process indicator (P2D3)?

The Use of Bifurcated vs Slotted Terminals

Question: We are trying to understand the rationale for choosing to install bifurcated terminals for power lead attachments versus slotted terminals. For years we’ve designed with slotted terminals in PWBs for leaded component (hi-rel transistors and diodes) and stranded wire straps.

Soldering PTH Components In-line with Stranded Wire

Question: Can a PTH component (resistor, fuse, or solid wire) be reliably soldered in-line with stranded wire? Similarly to a wire lap joint, but with a component between the two wires. Is there an IPC standard that covers this situation?

Scoring of Soldered Boards with Online Testing

Question: I am working through the online testing for our employees. I have a question regarding the score for the solder board for J-STD-001 and how and when that gets submitted in the system. Having worked through the first test and realizing that the test does not get submitted until the end date, that was entered in the system when it was set up, I was thinking that on that date it may ask for a solder score. It does not. Where does this get submitted?

75% Barrel Fill Requirement for Class 2 Change in J-STD-001 Revision F

Question: Why did the IPC change the barrel fill requirement for Class 2 in J-STD-001 Revision F? Revision E allowed 50% when there was a thermal plane. Now, Rev. F states 75% regardless of thermal plane. It all depends on how many leads the component has, with 14 being the magic number.

Could you shed some light on “WHY” the IPC changed the standard?

Is the J-STD-001FS Certification Available

Question: Is the J-STD-001FS Certification available for delivery yet? I know the document is available.