Through-Hole / THT Assembly Services — Wave Soldering & High-Reliability Manual Soldering
LinkPCBA provides high-reliability Through-Hole (THT) Assembly Services including wave soldering, selective soldering, and IPC-certified manual soldering.
Our Shenzhen-based production lines support power electronics, industrial control, automotive modules, and mixed-technology PCBAs, ensuring stable mechanical strength, high current capability, and long-term durability for demanding applications.
Why OEM & ODM Clients Choose LinkPCBA for THT Assembly
High-Reliability Wave & Selective Soldering
- Consistent solder quality for high-current and high-thermal-mass components.
IPC-Certified Manual Soldering
- Certified technicians handle connectors, transformers, relays, terminals, and other special parts.
Suitable for Power & Automotive Applications
- Strong mechanical strength, vibration resistance, and long-term reliability.
Complete Process Control
- Pre-bake, flux control, solder pot maintenance, solder dross removal, and thermal profiling.
Mixed Assembly Support（SMT + THT）
- Integrated workflow with SMT reflow + THT wave soldering in one production system.
SMT Assembly Capabilities
Component Capability
- Pin headers & connectors
- Transformers & inductors
- Relays, fuses, large capacitors
- High-current terminals
- Screw terminals
- Mechanical components
Process Capability
- Wave soldering
- Selective soldering
- Manual soldering
- DIP insertion (auto / semi-auto)
- High-current joint reinforcement
- Thermal mass management
- Lead-free soldering
Board Type Support
- Power electronics
- Industrial control boards
- Automotive modules
- LED drivers
- Charging modules
- Mixed signal boards
Engineering Support for THT
Our engineering team ensures repeatable solder quality even for complex assemblies.
- Component lead forming & trimming
- Thermal profiling for wave soldering
- Solder joint optimization
- Flux selection & control
- Avoiding shadowing, bridging, and icicles
- Fixture design & wave pallets
- Heavy component reinforcement
This engineering involvement significantly reduces defects and improves reliability.
Quality System & THT Process Control
Comprehensive QC Workflow
IQC → Pre-process check → Wave solder setup → IPQC → AOI (if applicable) → Visual inspection → FQC → OQC
THT Quality Controls
- Flux concentration & uniformity testing
- Solder pot maintenance & temperature stability
- Dwell time control
- Wetting balance measurement
- Proper lead trimming & hole solder fill verification
Inspection Capabilities
- Visual inspection
- Solder joint analysis
- Hole-fill percentage checking
- Pull strength test
- Burn-in & aging test (optional)
Standards
- IPC-A-610 Class 2 / Class 3
- RoHS / REACH compliance
- Full batch traceability
Applications
THT assemblies delivered by LinkPCBA are widely used in:
Industrial automation equipment
Power supply & power electronics
Automotive electronics
New energy systems
Medical & testing devices
Consumer electronics with mixed technology
Case Studies
Case 1 — High-Current Industrial Power Module
- Selective soldering for large copper areas
- Achieved 100% solder hole fill
- Reinforced terminals for vibration resistance
- Stable delivery over 24+ months
Case 2 — Automotive Sensor Interface Board
- Mixed SMT + THT process
- Zero bridging rate across 6 pilot batches
- Passed vibration & thermal cycling tests
FAQ — Through-Hole / THT Assembly
Connectors, transformers, relays, terminals, fuses, large capacitors, etc.
Yes, both.
Yes, it is our standard process.
IPC-A-610 Class 2 / 3.
Yes, including hole-fill checking and mechanical strength evaluation.
Start Your THT Assembly Project Today
Reliable Soldering • Power & Automotive Grade • Full Process Control
⭐ Updated April 2025 — Reviewed by LinkPCBA Engineering Team