Reliable Through-Hole(THT) Assembly Services
Durable soldering for connectors, high-power components, and mission-critical electronics.
UltroNiu provides high-reliability through-hole assembly (manual and wave soldering), ideal for power devices, large connectors, and components that require mechanical strength. With IPC-certified technicians, advanced soldering equipment, and rigorous inspection, we ensure durability and performance for automotive, defense, and industrial electronics.
Request a QuoteService Overview
Through-hole assembly remains indispensable for applications where mechanical strength, thermal durability, and long-term reliability are non-negotiable. At UltroNiu, we integrate automated wave soldering, selective soldering, and IPC-certified manual soldering to ensure every joint is robust, consistent, and built to last. With over 20 years of PCB and PCBA expertise, our through-hole solutions support industries ranging from defense and aerospace to automotive, power electronics, and industrial automation.
Our capabilities include:
High-Mix, Low-Volume (HMLV) flexibility for custom, agile projects
Scalable Mass Production for automotive, telecom, and industrial demand
Mixed-Technology Integration, seamlessly combining SMT and through-hole processes
Turnkey Services covering sourcing, assembly, testing, and system-level integration
By combining advanced soldering equipment, strict process control, and internationally recognized certifications (IPC-A-610, J-STD-001, ISO, AS9100D, IATF 16949, ISO 13485), UltroNiu ensures compliance, reliability, and performance at every build stage.
What is Through-Hole Assembly ?
Through-hole assembly is a proven method of mounting electronic components, where leads are inserted into drilled holes on a printed circuit board (PCB) and soldered to the opposite side. Unlike Surface Mount Technology (SMT), which mounts components directly on the PCB surface, through-hole assembly creates stronger mechanical bonds, making it essential for high-stress, high-heat, and load-bearing environments.
Benefits of Through-Hole Assembly :
Exceptional Mechanical Strength
Ideal for aerospace, defense, and automotive applications
Durability Under Stress
Withstands vibration, thermal cycling, and shock
Versatility
Supports axial, radial, and DIP components with robust anchoring
Serviceability
Components can be easily replaced or reworked
Hybrid Capability
Perfect for combining with SMT in mixed-technology assemblies
At UltroNiu, we apply both manual expertise and automated precision to ensure reliable performance across single-sided, double-sided, and multilayer PCBs.
Through-Hole Assembly Capabilities
UltroNiu’s through-hole assembly lines combine automation, IPC-certified craftsmanship, and rigorous quality assurance to meet the demands of mission-critical applications.
Core Capabilities
Wave Soldering for Volume Efficiency
Fully automated wave soldering lines for medium-to-high volume builds
Supports both leaded and RoHS-compliant processes
Consistent solder quality across connectors, relays, and power components
Selective Soldering for Complex Assemblies
Pinpoint soldering for densely populated or heat-sensitive boards
Precise thermal control to protect delicate components
Manual Insertion & Hand Soldering
IPC-certified technicians for low-volume, high-complexity, or high-reliability builds
Ideal for prototypes, aerospace, and defense projects
Double-Sided Through-Hole Soldering
Expertise in plated-through holes (PTH)
Ensures strong joints on both sides of the board for multilayer designs
Component Pre-Forming & Lead Trimming
Automated/semi-automated systems for consistent shaping and fit
Enhances solderability and joint reliability
All assemblies comply with IPC-A-610 & J-STD-001 Class II/III standards, ensuring every build meets global benchmarks for quality and reliability.
PCB Board Machine
Laser Marking Machine
YAMAHA YRP10e
YAMAHA-YRM-D
uk256YAMAHA（SPI）
YAMAHA
YAMAHA
AOI furnace front AOI
Reflow oven
Board harvester
Advanced Testing
Reliability begins with testing. At UltroNiu, every SMT assembly is validated through advanced inspection and testing processes to eliminate defects and ensure long-term performance.
Flying Probe Testing
Fixtureless, fast validation for prototypes and low-volume builds.
In-Circuit Testing (ICT)
Verifies component placement, solder integrity, and electrical performance.
Functional Testing
Simulates real-world operating conditions to ensure readiness.
Boundary Scan Testing
Non-intrusive diagnostics for high-density boards.
X-Ray Inspection
Detects hidden issues in BGA, QFN, and CSP solder joints.
Burn-In Testing
Identifies early-life failures under thermal and electrical stress.
Ionic Contamination Testing
Ensures board cleanliness for high-reliability applications.
Component Programming
In-house IC programming and embedded device flashing.
These layers of validation help guarantee that every UltroNiu assembly is defect-free, compliant, and ready for deployment in critical environments.
Quality & Certificat
Quality Inspection
Our quality culture is built on rigorous process control and continuous improvement:
100% AOI and X-Ray inspection for every build
Serial number traceability for complete accountability
Lean manufacturing and Six Sigma methodologies
Real-time monitoring across all SMT lines
IPC-A-610 and J-STD-001 trained engineers and operators
Certification System
UltroNiu holds internationally recognized certifications that enable us to serve regulated industries with confidence:
ISO 9001:2015 – Quality Management
ISO 13485:2016 – Medical Devices
AS9100D – Aerospace Quality Standard
IATF 16949:2016 – Automotive Electronics
RoHS & REACH – Environmental Compliance
ANSI/ESD S20.20 – Electrostatic Protection
UL Certification – Product Safety
IPC-A-610 / J-STD-001 – Global Workmanship Standards
Industry Application
UltroNiu’s PCBA solutions are trusted across industries where reliability, compliance, and performance are mission-critical. Our assemblies power advanced systems in defense, aerospace, computing, communications, automotive, medical, and industrial markets worldwide.
Defense & Military PCBA Solutions
Mission-critical assemblies designed for radar systems, electronic warfare (EW), encrypted communications, and missile guidance.
MIL-STD compliance, ITAR readiness, ruggedized reliability
IPC Class III workmanship, conformal coating, and vibration-resistant assemblies
Defense & Military PCBA Solutions
Public Safety & Security PCBA Solutions
Reliable electronics for surveillance systems, emergency communications, and homeland security platforms.
Secure, 24/7 uptime with long product lifecycles
Hybrid SMT+THT assemblies, redundancy designs, and RoHS/REACH-compliant production
Public Safety & Security PCBA Solutions
Aerospace & Aviation PCBA Solutions
High-reliability boards for avionics, flight control, satellite communications, and UAV platforms.
Lightweight, space-optimized designs with AS9100D certification
Rigid-flex assemblies, RF/microwave PCBs, and thermal management expertise
Aerospace & Aviation PCBA Solutions
Public Safety & Security PCBA Solutions
Reliable electronics for surveillance systems, emergency communications, and homeland security platforms.
Secure, 24/7 uptime with long product lifecycles
Hybrid SMT+THT assemblies, redundancy designs, and RoHS/REACH-compliant production
Public Safety & Security PCBA Solutions
Automotive & EV PCBA Solutions
Automotive-grade assemblies for ECUs, ADAS, EV battery management, and charging systems.
IATF 16949 compliance, vibration resistance, thermal cycling reliability
Burn-in tested assemblies, conformal coating, and traceability across supply chains
Automotive & EV PCBA Solutions
Medical & Life Sciences PCBA Solutions
ISO 13485-certified boards for patient monitoring devices, diagnostic imaging, implantables, and laboratory equipment.
Zero-defect tolerance, full traceability, biocompatibility considerations
Ultra-clean production, ionic contamination testing, and functional verification
Medical & Life Sciences PCBA Solutions
Customer Success Stories
A showcase of how UltroNiu’s through-hole assembly solutions deliver strength, consistency, and compliance across industries.
Defense & Military – Ruggedized Radar Control PCBA
Challenge:
Radar processing modules required high pin-count connectors and power components mounted with mechanical robustness to survive vibration and shock per MIL-STD-810.
Solution:
Used selective soldering for high-density boards, applied conformal coating, and implemented burn-in testing at −55°C to +125°C.
Results:
Delivered ruggedized radar PCBAs with zero field failure across 2,000+ operational hours in active defense systems.
Aerospace & Aviation – Flight Control Computer (FCC) Boards
Challenge:
Avionics flight control boards demanded reliability under thermal cycling and dual-sided through-hole soldering for redundant power circuits.
Solution:
Integrated wave soldering for bulk components and manual insertion for mission-critical relays, validated under AS9100D aerospace standards.
Results:
Achieved 100% first-pass yield and qualified boards for Boeing-equivalent avionics control systems.
AI & Edge Computing – High-Power GPU Server Backplanes
Challenge:
Next-generation AI server backplanes required heavy copper PCBs and high-current through-hole connectors to sustain 200A+ power delivery.
Solution:
Applied custom lead-forming, selective soldering, and thermal relief pad designs for heat dissipation.
Results:
Delivered scalable backplanes powering GPU clusters in hyperscale data centers, with MTBF improved by 15%.
Public Safety & Security – Mission-Critical Radio Base Units
Challenge:
Emergency communication systems demanded durable through-hole PCBA with axial capacitors, transformers, and RF connectors resistant to field abuse.
Solution:
Used wave soldering for bulk insertion, applied potting for moisture resistance, and tested under 24/7 broadcast simulation.
Results:
Produced radio base station units deployed for homeland security and disaster recovery networks.
Telecommunications & High-Speed Networking – 5G Base Station RF Modules
Challenge:
RF front-end boards required tight impedance control and reliable connector soldering for 28–40 GHz performance.
Solution:
Combined SMT RF circuits with through-hole-mounted coaxial connectors, validated with X-ray inspection and boundary scan testing.
Results:
Supplied 5G/6G base station PCBAs supporting global telecom deployments.
Why Choose UltroNiu
20+ Years of Expertise
Proven track record in PCB assembly, trusted by OEMs and EMS providers worldwide.
End-to-End Solutions
Complete services including DFM review, component sourcing, SMT & THT assembly, testing, and box build integration.
Certified Quality
ISO 9001, GJB-9001,AS9100D, ISO 13485, IATF 16949, RoHS/REACH compliance, with IPC-A-610 & J-STD-001 certified operators.
Advanced Equipment
40 Yamaha YSM20R high-speed SMT placement machines, automated wave soldering, selective soldering, AOI, SPI, X-ray, and conformal coating systems.
Agile & Scalable Production
From 24–48h prototyping and NPI programs to high-mix low-volume and high-volume production, we adapt to your product lifecycle.
Inside Our Facilities
UltroNiu’s PCBA solutions are trusted across industries where reliability, compliance, and performance are mission-critical. Our assemblies power advanced systems in defense, aerospace, computing, communications, automotive, medical, and industrial markets worldwide.
Fully Automated Solder Paste Printers
Provide 100% inline visual inspection to detect misalignment, solder bridges, and placement defects in real time.
Automated Optical Inspection (AOI) Systems
Provide 100% inline visual inspection to detect misalignment, solder bridges, and placement defects in real time.
High-Speed SMT Pick-and-Place Machines
Place components as small as 01005 with ±25 μm accuracy, supporting fine-pitch BGAs, QFNs, and CSPs.
Nitrogen Reflow Ovens
Deliver precise thermal profiles with nitrogen protection, enabling high-quality, lead-free soldering for complex boards.
X-Ray Inspection Systems
Validate hidden solder joints in BGAs, LGAs, and QFNs, ensuring structural integrity and electrical reliability.
Conformal Coating Machines
Apply protective coatings to safeguard assemblies against moisture, dust, and harsh environmental conditions.
Solder Paste Inspection (SPI) Systems
Measure paste thickness and volume in 3D, guaranteeing stable solder joints and long-term reliability.
Automated Wave Soldering Machines
Provide high-throughput, uniform soldering for through-hole components and hybrid assemblies.
First Article Inspection (FAI) Systems
Validate initial production builds with complete component verification before mass manufacturing.
FAQ
What is the minimum order quantity (MOQ) for through-hole assembly?
We support highly flexible volumes, from single prototypes and engineering validation builds to high-volume mass production.
How fast can you deliver prototypes?
Depending on complexity, Rich Full Joy can provide quick-turn prototypes in as little as 3–5 days with full DFM (Design for Manufacturability) support.
Do you handle mixed-technology assemblies with both SMT and through-hole components?
Yes. We specialize in hybrid PCBA, sequencing SMT first and then wave/selective soldering, with optimized thermal profiles to ensure reliability.
Can you provide both leaded and RoHS-compliant through-hole soldering?
Absolutely. We support SnPb (tin-lead) and lead-free RoHS processes, ensuring compliance with customer and regulatory requirements.
What types of components can you assemble with through-hole technology?
We handle axial, radial, DIP, power semiconductors, transformers, relays, and connectors—both single- and double-sided soldering.
Quote Process
Accelerate your innovation with UltroNiu’s trusted PCB Assembly Services.
From prototype builds to scalable mass production, we deliver precision, compliance, and reliability for your industry.
- PCB quote: upload Gerber file
- BOM quote: upload BOM file
- Assembly Quote
- Confirm & Submit
Contact supporting agent (24hours online)
Please feel free to contact us if you have any need.
World-class PCB & PCBA manufacturer focused on high-frequency and high-reliability boards for defense, aerospace, automotive and industrial electronics.
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