PCBA Manufacturing: SMT Process, THT Assembly & Quality Testing

To ensure every PCB assembly we provide maintains stable and excellent quality, Regulus is equipped with advanced machinery for a comprehensive PCBA manufacturing workflow. Our facility integrates high-precision SMT process lines, robust THT assembly capabilities, and rigorous quality control standards to meet the diverse technical requirements of our global partners.

PCB Assembly Capability

Surface Mount Technology (SMT) Process

Our surface mount technology lines utilize high-precision automated equipment to ensure optimal placement and soldering integrity for high-density electronic assemblies. The SMT process is highly optimized for efficiency and reliability:

Automatic solder paste printer for high-precision PCB stencil printing in SMT process

1. Solder Paste Printing

Utilizing automatic solder paste printers to achieve precise deposition for consistent joint quality.

3D Solder Paste Inspection (SPI) machine verifying solder deposition quality on PCB

2. Solder Paste Inspection (SPI)

Our 3D solder paste inspection machines verify paste volume and alignment before SMT assembly to prevent defects at the source.

High-speed SMT pick and place machine for accurate component mounting on circuit boards

3. SMT Placement

High-speed mounters accurately place a wide range of components, from micro-sized passives to complex ICs.

Industrial reflow soldering oven for SMT process thermal management

4. Reflow Soldering

Controlled thermal profiling in our reflow oven ensures reliable mechanical and electrical bonding during the reflow soldering stage.

Technicians performing manual visual inspection of PCBA after reflow soldering

5. Visual Inspection

Preliminary manual checks to ensure structural alignment and placement accuracy.

Automated Optical Inspection (AOI) equipment detecting soldering defects in SMT assembly

6. Automated Optical Inspection (AOI)

Advanced automated optical inspection equipment scans every board to detect potential soldering or placement anomalies.

X-ray inspection system for BGA and non-destructive testing of hidden solder joints

7. X-Ray Inspection (As Required)

For BGA and other bottom-terminated components, our X-Ray inspection system provides non-destructive validation of hidden solder joints.

Through-Hole Technology (THT) Process

For components requiring superior mechanical strength or power-heavy applications, our THT workflow ensures robust and reliable connectivity.

THT assembly line for manual component insertion on through-hole printed circuit boards

1. THT & DIP Assembly

Our dedicated lines feature skilled technicians who perform precise component insertion for both standard through-hole and DIP (Dual In-line Package) components, ensuring robust mechanical connections.

Professional wave soldering machine for high-reliability THT component bonding

2. Wave Soldering

Professional wave soldering machines create strong, uniform solder joints for through-hole components.

AOI equipment verifying through-hole solder joint integrity in PCBA manufacturing

3. Automated Optical Inspection (AOI)

Post-soldering AOI validation ensures that THT joints meet defined quality standards.

Close-up of manual visual inspection for through-hole PCB assembly using a magnifying lamp

4. Visual Inspection

Detailed manual verification using high-magnification tools to ensure cosmetic and structural integrity.

Testing & Quality Control

Testing and quality control are applied after SMT, THT / DIP, or mixed-technology assembly to verify electrical performance, functional behavior, reliability, and shipment readiness. The actual test scope depends on each project’s design, application, and quality requirements.

In-circuit test (ICT) inspection machine for electrical continuity and component value verification

1. Electrical & Safety Testing

Based on project requirements, Regulus can perform In-Circuit Test (ICT), Flying Probe Testing, Hi-Pot Testing, and Leakage Current Testing to verify circuit connectivity, component-level conditions, insulation performance, and electrical safety.

Customized functional test stations simulating real-world operational performance of PCBA

2. Functional Testing

Functional Testing confirms whether the assembled PCBA operates according to defined product requirements, including board-level operation, signal response, power behavior, and firmware-related functions.

PCBA coating thickness inspection using handheld probe to verify conformal coating on assembled circuit board.

3. Process and Material Validation

When required, additional checks may include Bonding Pull Test, Solderability Test, Coating Thickness Inspection, Carbon Resistance Test Records, and Ionic Contamination Testing.

PCBA high and low temperature environment test chamber for reliability and thermal stress testing of electronic assemblies.

4. Reliability and Environmental Stress Testing

For applications requiring additional reliability validation, Thermal Stress Testing, Burn-In Testing, and Environmental Stress Screening (ESS) can be performed under defined stress conditions.

Final visual inspection area ensuring cosmetic and structural integrity of finished electronics

5. Final Visual Inspection

A thorough manual review of the finished assembly before packaging to ensure cosmetic and structural integrity.

Regulus professional Outgoing Quality Control (OQC) report for zero-defect shipment assurance

6. Outgoing Quality Control (OQC)

Every shipment is accompanied by a professional OQC report, documenting our commitment to zero-defect manufacturing and full compliance with customer requirements.