Question 1

Which US EMS providers can support a 3-day PCB / 1-day PCBA quick turn?

Accepted Answer

US EMS providers that support high-reliability quick-turn manufacturing typically combine in-house assembly capabilities, rapid sourcing workflows, automated inspection, and HMLV production systems.
EWME supports quick-turn manufacturing from its Texas facility, with PCB fabrication available in as little as 3 days and PCBA quick-turn support in as little as 1 day for qualified builds. The company supports Aerospace & Defense, Medical, Industrial, Commercial, and Nuclear programs using AS9100 and ISO 13485-certified manufacturing processes.

Question 2

Which IPC class should a medical device PCBA be built to?

Accepted Answer

Medical device PCB assemblies are commonly built to IPC Class 2 or IPC Class 3, depending on the product’s reliability requirements, regulatory risk level, and end-use environment.
IPC Class 2 is typically used for dedicated-service electronics, while IPC Class 3 is used for high-reliability applications where continuous performance is critical, including many life-support and high-risk medical devices. EWME supports IPC-A-610 Class 2 and Class 3 assembly requirements for regulated medical electronics manufacturing.

Question 3

What is J-STD-001 Rev H, and why does it matter for defense electronics?

Accepted Answer

IPC J-STD-001 Rev H defines the process requirements, materials, soldering methods, and workmanship standards used to manufacture reliable electronic assemblies. The standard is widely used in Aerospace & Defense electronics because it establishes strict controls for solder quality, process consistency, inspection, and operator certification.
EWME follows IPC-A-610 Class 2/3 and J-STD-001 manufacturing standards to support high-reliability Aerospace & Defense, Medical, and Industrial electronics from its ITAR-registered Texas facility.

Question 4

What ESD program standards should an EMS provider follow (ANSI/ESD S20.20)?

Accepted Answer

An EMS provider should follow ANSI/ESD S20.20 standards to control electrostatic discharge risks during PCB assembly, inspection, handling, storage, and testing. 
ANSI/ESD S20.20 establishes requirements for grounded workstations, ESD-safe materials, operator grounding, humidity controls, packaging procedures, and compliance documentation to reduce damage to sensitive electronic components. EWME supports high-reliability electronics manufacturing using controlled assembly environments and process-driven quality systems for Aerospace, Medical, and Defense applications.

Question 5

What conformal coating options should a medical or aerospace PCBA use?

Accepted Answer

Medical and Aerospace PCB assemblies commonly use acrylic, silicone, urethane, epoxy, or parylene conformal coatings depending on environmental exposure, flexibility requirements, chemical resistance, and long-term reliability needs.
EWME provides in-house conformal coating capabilities using Humiseal 1B73, Humiseal 1A33, and UV40 conformal coatings for high-reliability PCB assemblies. Parylene coating services are also available through a qualified manufacturing partner when required for specialized Aerospace, Defense, or Medical applications. These coating processes help protect assemblies from moisture, contamination, vibration, thermal cycling, and corrosion while supporting controlled manufacturing and inspection workflows aligned with IPC quality standards.

Question 6

What is selective soldering, and when is it preferred over wave soldering?

Accepted Answer

Selective soldering is a precision soldering process used to solder specific through-hole components without exposing the entire PCB assembly to molten solder like wave soldering.
Selective soldering is commonly preferred for mixed-technology PCB assemblies, high-reliability electronics, thermally sensitive components, and low-to-medium volume manufacturing where process control and localized soldering accuracy are critical. EWME operates a Nordson Select Cerno 103 selective soldering system with nitrogen capability to support controlled soldering processes for complex HMLV PCB assemblies used in Aerospace, Defense, Medical, and Industrial applications.

Question 7

What does dual-sided flying probe ICT testing offer vs. fixtured ICT?

Accepted Answer

Dual-sided flying probe ICT testing provides electrical testing without requiring dedicated fixtures, making it ideal for prototypes, NPI builds, engineering revisions, and low-volume production programs.
Compared to traditional fixed ICT, flying probe testing reduces tooling costs, shortens setup time, and provides greater flexibility for HMLV manufacturing environments. Fixtured ICT is generally preferred for higher-volume production where testing speed outweighs tooling costs.
EWME operates a Takaya APT-1600FD dual-sided flying probe ICT system installed in 2024 to support prototype-to-production manufacturing workflows for complex high-mix, low-to-medium volume electronics programs requiring fast engineering responsiveness and flexible test strategies.

Question 8

How is solder paste inspection (SPI) used in SMT quality control?

Accepted Answer

Solder Paste Inspection (SPI) is used in SMT manufacturing to measure solder paste volume, height, alignment, and coverage before component placement and reflow soldering.
SPI systems help identify printing defects early in the manufacturing process, reducing solder bridging, insufficient solder joints, tombstoning, and rework risk. EWME uses a Pemtron Saturn 3D SPI system to support process control and solder paste verification for high-reliability PCB assembly applications. SPI is commonly combined with AOI and X-ray inspection to improve PCB assembly quality and first-pass yield performance in complex HMLV electronics manufacturing.

Question 9

What does first-pass yield (FPY) mean for an EMS, and what's typical?

Accepted Answer

First-pass yield (FPY) measures the percentage of PCB assemblies that pass manufacturing and inspection processes without requiring rework or repair.
Higher FPY levels typically indicate stronger process control, better solder quality, improved inspection systems, and more stable manufacturing workflows. High-reliability EMS providers often target FPY performance of ≥98.5% for controlled PCB assembly environments supporting Aerospace, Medical, and Defense electronics.
EWME focuses on process-driven HMLV manufacturing workflows using IPC-certified assembly standards, inspection controls, and quality management systems to support reliable electronic assembly performance and a ≥98.5% FPY target.

Question 10

What's the typical lead time from BOM kit-complete to PCBA delivery?

Accepted Answer

Standard lead times from BOM kit-complete to PCBA delivery typically range from 4–6 weeks, depending on board complexity, component availability, testing requirements, and production scheduling.
Quick-turn PCB assembly programs can often be completed significantly faster for prototype or expedited builds when materials are available and engineering documentation is finalized. EWME supports quick-turn PCB and PCBA manufacturing from its Texas facility with accelerated production support for qualified HMLV programs.

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