High-reliability PCB assembly undergoing automated deionized water cleaning for solder flux removal followed by ionic contamination inspection per IPC Class 3 standards
IPC-A-610 Class 3 high-reliability PCB assembly under microscope inspection verifying solder joint wetting, fillet geometry, and void-free BGA attachment for aerospace application
High-reliability PCB assembly undergoing automated deionized water cleaning for solder flux removal followed by ionic contamination inspection per IPC Class 3 standards
IPC-A-610 Class 3 high-reliability PCB assembly under microscope inspection verifying solder joint wetting, fillet geometry, and void-free BGA attachment for aerospace application

PCB Assembly IPC Class 3

Core Advantages

Fab & Assembly Standard

IPC-A-610 Class 3

Inspection Coverage

100% AOI, SPI, X-Ray

Quality System

ISO 9001, AS9100D

Application

Aerospace, Medical, Automotive Safety

Consulting

+86 755 2828 2776

Business Hours (Mon.-Sat.)

9:00 - 18:00

Key Specifications & Technical Parameters

Our IPC Class 3 assembly services meet the highest reliability standards for mission-critical electronics. We implement rigorous process controls—from solder paste inspection to final functional testing—ensuring zero-defect performance in aerospace, medical, and automotive safety systems.

Basic Features

Class Standard

IPC-A-610 Class 3

Component Types

SMT, Through-Hole, Mixed Technology

Fine-Pitch Capability

Down to 0.3 mm pitch BGAs, 0201 passives

Inspection Methods

AOI, SPI, X-Ray, ICT, Flying Probe

Typical Value

Solder Paste Inspection

100% SPI, volume tolerance ±15%

Placement Accuracy

±0.03 mm @ 3 sigma

Reflow Profile Control

12-zone profiling, ΔT <5°C across PCB

First Pass Yield

 ≥98% (NPI), ≥99.5% (production)

Selection Reference

Solder Joint Voiding

<25% (BGA/QFN), <50% (PTH)

Component Placement

±0.05 mm

Solder Paste Volume

±15% of stencil aperture

Critical Value

Solder Joint Integrity

100% visual under 10x magnification, no cracks or voids exceeding class limits

Conformal Coating

Thickness 25–75 µm, bubble-free, per IPC-CC-830

Cleanliness

Ionic contamination < 1.56 µg NaCl/cm²

Reference list

Solder paste

Solder Joint Pull Test

Yes

Component Pull Test

√ for BGA、QFN

Quality Specification

Halogen free

Full compliance

RoHS Status

Full compliance

REACH Status

Full compliance

Quality Assurance

In the demanding world of aerospace, medical implants, and automotive safety systems, PCB assembly failure is not an option. Our IPC Class 3 assembly processes are built on rigorous in-process controls—from automated optical inspection (AOI) and solder paste measurement to X-ray inspection of BGAs and 100% functional testing. Every assembly is documented with full traceability to meet the highest reliability requirements.

AOI

X-ray

IPC Class 3

100% functional testing

AOI
0 %
Functional testing
0 %
X-ay
0 Phases
Lead time for prototype
0 H

Product Details

Discover our precision assembly processes, quality controls, and the technical expertise behind our IPC Class 3 PCB assembly services.

Product Overview

Engineered for mission-critical electronics, our IPC Class 3 assembly services combine advanced manufacturing processes with rigorous quality controls. Every design undergoes DFM/DFA review, precision solder paste printing, automated optical inspection, and X-ray verification to ensure flawless assembly. The result: unmatched reliability for the most demanding applications.

Core Advantages

Technical Features

We use our self-developed, customized PCB assembly production process, strictly controlling every step from raw material inspection to finished product testing to ensure stable and reliable quality.

1
DFM/DFA Review

Senior engineers perform DFM/DFA checks using Valor and Genesis 2000, optimizing component placement and panelization.

2
Solder Paste & SPI

Precision stencil printing (Type 4/5 paste) with 100% solder paste inspection (SPI), volume tolerance ±15%.

3
High-Speed Placement

Automated pick-and-place with ±0.03 mm placement accuracy, supporting 0.3 mm pitch BGAs and 01005 passives.

4
Reflow Soldering

12-zone reflow oven with continuous profile monitoring, nitrogen atmosphere option for fine-pitch.

5
Automated Optical Inspection

100% AOI of all assemblies, detecting component placement, polarity, and solder joint defects.

6
X-Ray Inspection

100% X-ray for BGAs, QFNs, and other hidden solder joints to verify voiding and alignment.

7
Through-Hole & Conformal Coating

Selective soldering for through-hole components; optional conformal coating (acrylic/silicone/urethane).

8
Functional Testing & FAI

100% functional test, in-circuit test (ICT) – in case required from customer, or flying probe; first article inspection (FAI) report

Every assembly undergoes 100% AOI and X-Ray inspection to ensure solder joints meet IPC-A-610 Class 3 criteria—no cracks, no voids exceeding class limits, no wetting defects.

Zero-Defect Solder Joints

Every assembly undergoes 100% AOI and X-Ray inspection to ensure solder joints meet IPC-A-610 Class 3 criteria—no cracks, no voids exceeding class limits, no wetting defects.

Complete Traceability

Batch-level traceability tracks all components, materials, and processes. Optional serialization supports full lifecycle management and field returns.

High-Reliability Processes

Controlled reflow with 12-zone profiling, nitrogen atmosphere, and continuous temperature monitoring ensures consistent, repeatable results across all assemblies.

Application Areas

We deliver IPC Class 3 assemblies to industries where reliability is non-negotiable—aerospace, medical, automotive safety, and mission-critical industrial systems.

Aerospace & Defense

Flight control systems, avionics, satellite payloads, radar modules, and military communications equipment requiring AS9100D and full traceability.

Avionics

Satellite

Radar

Medical Devices

Implantable devices, surgical navigation systems, patient monitors, diagnostic imaging, and lab equipment with ISO 13485 compliance.

Urgical navigation systems

Patient monitors

ISO 13485

Automotive Safety Systems

ADAS (radar/LiDAR), engine control units (ECU), airbag controllers, battery management systems (BMS) for electric vehicles.

Radar/LiDAR

ECU

BMS

Industrial & Critical Infrastructure

Power grid protection, railway signaling, industrial robotics, oil & gas control systems, and nuclear instrumentation.

Power

Railway

Oil & gas

Telecommunications

Base station controllers, core routers, optical transport equipment requiring high reliability in continuous operation.

Base station

Routers

Optical transport

High-Performance Computing

AI servers, GPU accelerators, and HPC systems where board failure translates to massive downtime costs.

Servers

GPU

HPC systems

Project Story

A leading European medical device manufacturer required a Class 3 assembly partner for a next-generation surgical navigation system. The system combined 0.4 mm pitch BGAs, delicate flex circuits, and stringent sterilization requirements. Our engineering team performed DFM/DFA optimization, validated the reflow profile with nitrogen, and delivered 100% X-ray and functional test coverage. The result: zero field failures across 2,500+ units deployed in operating rooms worldwide.

IPC-A-610 Class
0
Minimum BGA pitch
0 mm
Zero failures across
0 +

Deionized water cleaning

On a IPC class 3 assembly circuit board

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