Editorial Technical Reference

Automated Solder Paste Inspection (SPI) System

This page explains how Automated Solder Paste Inspection (SPI) System is classified within Electronic Component Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Vision-based system for measuring solder paste volume, height, and alignment on PCBs

View Full Specifications Explore Manufacturing Sources
Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Automated Solder Paste Inspection (SPI) System

Definition
An Automated Solder Paste Inspection (SPI) System is a standalone industrial machine that uses 3D optical measurement technology to inspect solder paste deposition on printed circuit boards (PCBs) before component placement. It ensures proper solder paste volume, height, area, and alignment to prevent defects like bridging, insufficient solder, or misalignment. The system provides real-time feedback for process control and statistical process monitoring, improving first-pass yield and reducing rework in surface mount technology (SMT) assembly lines. It operates as an inline inspection station that can be integrated into production workflows or used as a standalone quality control instrument. The system typically features an aluminum alloy frame, stainless steel components, optical glass lenses, and polycarbonate safety covers. Key parameters include measurement accuracy of ±0.05 μm, inspection speed of 30–60 cm²/sec, maximum board size of 510×460 mm, resolution of 10–20 μm/pixel, repeatability of ±0.02 μm, power consumption of 1.5–2.5 kW, operating temperature of 15–35 °C, operating humidity of 30–80% RH, ingress protection rating of IP54–IP65 (per IEC 60529), supply voltage of 220–240 V AC (single phase, 50/60 Hz), weight of 800–1200 kg, and camera type of 5–12 MP (monochrome or color). These values are reference ranges and must be confirmed for the specific model and application. The system is designed for use in electronic component manufacturing, particularly in SMT assembly lines. It is not a consumer product but an industrial tool. For procurement, verify model-specific specifications and standards with the legal manufacturer or supplier.
Working Principle
The system uses structured light or laser triangulation to project patterns onto solder paste deposits. High-resolution cameras capture images of the projected patterns, and the system processes the 3D data to calculate the volume, height, and positional accuracy of each pad. This allows for precise measurement of solder paste deposition, enabling detection of defects such as insufficient solder, bridging, or misalignment. The working principle relies on optical measurement and does not involve contact with the PCB, ensuring non-destructive inspection.
Common Materials
Aluminum alloy frame, Stainless steel components, Optical glass lenses, Polycarbonate safety covers
Technical Parameters
ParameterTypical rangeNotes & selection driver
Measurement AccuracyRequired±0.05 μmHeight measurement precision for solder paste deposits
Inspection SpeedRequired30–60 cm²/secArea inspection rate for PCB surfaces
Maximum Board SizeRequired510×460 mmLargest PCB dimension the system can accommodate
ResolutionRequired10–20 μm/pixelSpatial resolution of the optical system
RepeatabilityRequired±0.02 μmMeasurement consistency for identical features
Power Consumption1.5–2.5 kWMaximum electrical power requirement during operation
Operating Temperature15–35 °CFor consistent measurement
Operating Humidity30–80 % RHNon-condensing
Ingress ProtectionIP54–IP65For dust and water resistanceIEC 60529
Supply Voltage220–240 V ACSingle phase, 50/60 Hz
Weight800–1200 kgDepending on configuration
Camera Type5–12 MPMonochrome or color

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • 3D Optical Sensor Head
    Projects structured light and captures 3D images of solder paste
    Material: Aluminum housing with optical glass
  • Precision XY Motion Stage
    Moves PCB under sensor for complete surface inspection
    Material: Aluminum alloy with linear guides
  • Vision Processing Unit
    Processes image data and calculates measurement results
    Material: Electronic components on PCB
  • Operator Interface Panel
    Touchscreen display for system control and result viewing
    Material: Stainless steel frame with glass touchscreen
  • Illumination System
    Provides consistent lighting for accurate image capture
    Material: LED arrays with diffusers
  • Conveyor System Optional
    Transports PCBs into and out of inspection area
    Material: Stainless steel rails with belt

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Automated Solder Paste Inspection (SPI) System.

Solder Paste Inspection Machine 3D SPI System Solder Paste Measurement System automated solder paste inspection system

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: N/A (non-contact optical system)
other spec: PCB size: 50x50mm to 610x610mm, inspection speed: 15-25 cm²/sec, resolution: 10-20μm, illumination: LED-based multi-angle
temperature: 15-35°C (operating), 0-50°C (storage)
Media Compatibility
✓ Solder paste (lead-free SAC305, SnPb) ✓ PCB substrates (FR4, ceramic, flexible) ✓ Solder mask (LPI, dry film)
Unsuitable: High-vibration environments (exceeding 0.5G at 10-500Hz) or direct sunlight exposure
Sizing Data Required
  • Maximum PCB dimensions (length x width)
  • Required inspection speed (boards/hour)
  • Minimum defect detection size (μm)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Optical System Degradation
Cause: Accumulation of dust, solder paste particles, or flux residues on lenses, cameras, or lighting elements, leading to reduced image clarity, false defect detection, or system calibration drift.
Mechanical Positioning Inaccuracy
Cause: Wear or contamination of linear guides, ball screws, or encoders in the XY stage or Z-axis, resulting from inadequate lubrication, particulate ingress, or mechanical fatigue, causing misalignment and inspection errors.
Maintenance Indicators
  • Increasing frequency of false defect calls or missed defects during routine process audits.
  • Unusual audible vibrations, grinding noises, or inconsistent motion from the inspection stage during operation.
Engineering Tips
  • Implement a strict, scheduled cleaning regimen for optical components using approved, non-abrasive materials and controlled environments to prevent contamination buildup.
  • Establish a preventive maintenance schedule for mechanical components, including lubrication of linear motion systems and verification of positioning accuracy via laser interferometry or calibrated artifacts.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IPC-A-610 - Acceptability of Electronic Assemblies IEC 61010-1 - Safety Requirements for Electrical Equipment

Quoted from the published standard.

Manufacturing Precision
  • Solder Paste Height: +/- 0.02mm
  • Solder Paste Volume: +/- 15% of target
Quality Inspection
  • 3D Solder Paste Height Measurement
  • Solder Paste Area Coverage Analysis

Manufacturers of Automated Solder Paste Inspection (SPI) System

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

LeadsIntec Group
Guangdong, CN
Also makes: Rf Pcb, Fuel Level Sensor, Heavy Copper PCB and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the primary function of an SPI system?

The primary function is to inspect solder paste deposition on PCBs before component placement, measuring volume, height, area, and alignment to prevent defects.

How does the system measure solder paste?

It uses structured light or laser triangulation to project patterns onto the paste, captures images with high-resolution cameras, and processes 3D data to calculate measurements.

What are typical performance specifications?

Reference ranges include measurement accuracy of ±0.05 μm, inspection speed of 30–60 cm²/sec, and repeatability of ±0.02 μm. Confirm exact values for your model.

Can the system be integrated into an existing production line?

Yes, it can operate as an inline inspection station or as a standalone quality control instrument, depending on the workflow requirements.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.
Buyer enquiry

Request manufacturing insight for Automated Solder Paste Inspection (SPI) System

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes
Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here
We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman
CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim
A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at contact@cnfx.com.

Need to Manufacture Automated Solder Paste Inspection (SPI) System?

Compare manufacturer profiles with relevant product and process capability.

Create Manufacturer Profile Contact Us
Previous Product
Surface Mount Technology (SMT) Pick-and-Place Machine
Last Product
Get QuotesChat