Specialized in high-precision mixed-technology (SMT+DIP) PCB assembly
Comparison of SMT/DIP Process Capabilities (In Compliance with IPC-A-610G and ISO 13845-1:2025 Standards)
Comparison of Core Process Capabilities between SMT and DIP
| Parameter | SMT Process | DIP Process |
|---|---|---|
| PCB Size Range | 50×50mm - 510×460mm (customizable up to 610×610mm) | 80×80mm - 450×600mm (special fixtures required for irregular-shaped boards) |
| Component Size Limits | 01005 chip (0.4×0.2mm) - 55×55mm BGA | Pin diameter: 0.3 - 2.0mm; Body size ≤ 80×80mm |
| Placement Accuracy | ±25μm (CPK ≥ 1.67) | ±0.05mm (visual alignment for insertion) |
| Soldering Method | Nitrogen reflow soldering (peak temperature: 245℃ ± 3℃) | Selective wave soldering (temperature: 265℃ ± 5℃) |
| Special Board Support | Flexible boards, rigid-flex boards, 0.4mm ultra-thin boards | Thick copper boards (≥ 6oz), metal base boards (aluminum/copper) |
| Minimum Spacing Requirements | Component clearance ≥ 0.15mm; BGA pad pitch ≥ 0.2mm | Hole-to-edge distance ≥ 0.3mm; Annular ring width ≥ 0.2mm |
Key Process Capabilities
SMT Core Capabilities
- Ultra-Precision Placement:
- Supports 01005 components (0.4×0.2mm) and 0.3mm pitch μBGAs; placement speed ≥ 85,000 points per hour.
- Laser stencil aperture tolerance ±5μm; solder paste thickness control ±8μm (3D SPI inspection).
- Complex Board Compatibility:
- Rigid-flex boards: bending radius ≥ 3mm; FPC placement accuracy ±0.1mm.
- 0.4mm ultra-thin boards: warpage ≤ 0.1mm/m (supported by vacuum carriers).
DIP Core Capabilities
- High-Density Insertion:
- Through-hole diameter: 0.3 - 3.0mm; pin pitch ≥ 0.25mm (automatic insertion).
- Irregular-shaped components (transformers/heat sinks): manual insertion accuracy ±0.1mm.
- Soldering Reliability:
- Solder fill height ≥ 75% of board thickness; surface finish complies with IPC-J-STD-001 Class 3 standard.
Special Scenario Solutions
| Scenario | SMT Solution | DIP Solution |
|---|---|---|
| Oversized Boards (>510mm) | Segmented printing + multi-track placement | Custom fixtures + zoned wave soldering |
| Hybrid Assembly (SMT + DIP) | SMT first, then DIP (to avoid secondary reflow) | Selective soldering + shielding of SMT areas |
| High-Temperature Materials (Ceramics) | Low-temperature solder paste (Sn42/Bi58, melting point 138℃) | Silver sintering (thermal conductivity > 200 W/m·K) |
2025 Technology Upgrades
- AI Real-Time Control:
- Dynamically optimize SMT parameters (board temperature/humidity) → defect rate ≤ 50ppm.
- Green Manufacturing:
- Lead-free solder + nitrogen protection → VOC emissions reduced by 40% (compliant with ISO 14067:2025).
- Miniaturization Limits:
- 01005 placement yield ≥ 99.3% (3D AOI + deep learning correction).
- Case Study:
- Energy storage control board (480×420mm aluminum base board) using a hybrid SMT + DIP process → temperature rise ≤ 15℃ under 100A load.
Process Selection Guide
Scenarios for Choosing SMT
- High-density ICs, miniature consumer electronics, signal integrity > 10Gbps.
Scenarios for Choosing DIP
- Power devices (≥ 10A), high mechanical strength requirements, cost-sensitive industrial boards.
Data Source: 2025 Global Top 5 EMS White Paper and IPC Standards.
2025 One-Stop PCB Assembly Solution (High-Density SMT + DIP Process)
PCB assembly (PCBA) is a critical process for integrating components onto a circuit board. Under the 2025 intelligent manufacturing standards, it encompasses five core technology modules:
High-Precision SMT Placement
- Micro-Component Handling: Supports 01005 (0.4×0.2mm) chips and 0.3mm pitch BGAs, with placement accuracy ±25μm (CPK ≥ 1.67).
- Intelligent Solder Paste Printing: Laser stencil aperture error ±5μm, SPI inspection of solder paste volume/height tolerance ≤ 8%.
- Nitrogen Reflow Soldering: 12-zone temperature profile control (peak 245℃ ± 3℃), oxygen content < 800ppm, reducing voids in solder joints.
Hybrid Technology Assembly (THT + DIP)
- Automatic Insertion Machine: Accuracy 0.05mm, supports irregular-shaped components (inductors/connectors).
- Selective Wave Soldering: Solder joint yield > 99.9%, through-hole fill rate 100%.
Full-Process Quality Control
| Inspection Technology | Capability | Standard |
|---|---|---|
| 3D AOI | Identifies 0.1mm solder joint voids and tombstoning | IPC-A-610 Class 3 |
| X-ray | BGA void rate detection (≤ 5%) | ISO 14971 |
| Functional Testing (FT) | 5G/6G signal integrity verification | IEC 62368-1 |
Industry Application Scenarios
- Automotive Electronics: Complies with AEC-Q100 certification, high-temperature resistance (125℃+) and shock resistance (50G).
- Medical Devices: Uses biocompatible materials, produced in a sterile workshop (ISO Class 7).
- Industrial IoT: Supports wide-temperature operation (-40℃ - 85℃), MTBF > 100,000 hours.
2025 Technology Upgrade Highlights
- AI Defect Prediction: MES system analyzes solder joint deformation trends in real-time, improving yield to 99.95%.
- Green Manufacturing: Lead-free process + solder dross recovery rate ≥ 95%, reducing carbon footprint by 30%.
- Miniaturization Integration: SiP (System-in-Package) supports heterogeneous integration of 20 chips.
Full-turnkey PCBA: SMT Assembly (01005 components), DIP Soldering, Conformal Coating, ICT/FCT. Fuji NXT III lines, >99.95% yield. Flex/Rigid/Aluminum PCB hybrid assembly. 24h prototypes & low-volume batches. ISO13485/IATF16949 certified for medical, automotive & industrial controls.
SMT Point Count Lookup Table (Covers BGA/USB/IC, etc.)
| Component | Points |
|---|---|
| SMD 01005,0201,0402, 0603, 0805 Resistors/Capacitors/Inductors/LEDs | 1 |
| 2835 LED | 1.5 |
| 5050 LED | 3 |
| 1206, Small Diodes, Transistors | 1.5 |
| SMA Package Components | 2 |
| Electrolytic Capacitors | 2 |
| Tantalum Capacitors (Type A) | 1.5 |
| Tantalum Capacitors (Type B) | 2 |
| Tantalum Capacitors (Type C) | 3 |
| Tantalum Capacitors (Type D) | 4 |
| Wire-Wound Inductor CD32 | 2 |
| Wire-Wound Inductor CD54 | 3 |
| Wire-Wound Inductor CD75 | 4 |
| Wire-Wound Inductor CD105 | 5 |
| ICs with 4 Pins | 1 |
| USB/Mini USB/Micro USB Connectors | 4 |
| SD Card Slot | 7 |
| TF Card Socket | 5 |
| Headphone Jack | 4 |
| SMD Side Buttons | 2 |
| Two-Pin Buttons | 2 |
| SMD Crystal Oscillators | 2 |
| FPC Connector (4 Pins) | 3 |
| 78M05 TO-252 Package | 3 |
| 78M05 TO-263 Package | 5 |
| BGA (3 Solder Balls) | 1 |
