Skip to content 
What is Panelization of PCB? – Introduction to Panelization of PCB
What is DFM?
Panelization of PCB refers to the process of arranging multiple identical or different small printed circuit boards (PCBs) onto a single large panel. This is done to facilitate mass production, assembly, and cost reduction.
Panelization is a commonly used manufacturing technique by PCB manufacturers. It involves producing smaller circuit boards in a connected array format, making it easier to handle on the assembly line. Individual boards can then be separated from the array for quick packaging or installation into products. Alternatively, additional material can be processed around the edges of each board to increase the overall width, making them more suitable for assembly lines.
The Core Objectives of PCB Panelization
- Improve Production Efficiency: Produce multiple PCBs in a single manufacturing run, reducing equipment processing time.
- Reduce Costs: Optimize material utilization, minimize waste from offcuts, and lower labor costs while improving quality control.
- Facilitate Assembly: Suitable for automated SMT (Surface Mount Technology) batch soldering of components.
- Enhance Structural Stability: Prevent small-sized PCBs from warping or breaking during manufacturing.
- Simplify Packaging: PCB panelization not only boosts manufacturing efficiency and shortens lead times but also addresses logistical challenges, including handling smaller or irregularly shaped circuit boards.
Common forms of Panelization of PCB
- Identical PCB Panelization: Multiple identical PCBs arranged together (e.g., keyboard key circuits).
- Different PCB Panelization: Functionally related but different PCBs combined (e.g., main control board + interface board).
- Array Panelization: Regular matrix arrangement for easy depaneling (e.g., LED light boards).
Common Methods of PCB Panelization
The core of PCB panelization lies in efficiently arranging circuit boards while ensuring smooth depaneling. Below are five mainstream methods and their applicable scenarios:
1. V-Cut (V-Scoring)
- Principle: A V-shaped blade cuts shallow grooves into the PCB panel, leaving partial connections for easy manual or machine breaking.
- Features:
- √ Pros: Low cost, fast depaneling, suitable for regular rectangular PCBs (e.g., square module boards).
- × Cons: Only works for straight cuts; unusable for irregular PCBs.
2. Mouse Bites
Principle: A row of small holes (0.5–1 mm diameter) drilled at connection points to create breakaway tabs.
Features:
√Pros: Suitable for irregular PCBs (e.g., circular, L-shaped), leaves smoother edges after depaneling.
×Cons: Requires extra drilling; may leave burrs after separation.
Applications: Smartwatch PCBs, irregular sensor modules.
3. Tab Routing (Breakaway Tabs)
Principle: A milling cutter cuts hollow slots between PCBs, leaving small “bridges” for fixation.
Features:
√ Pros: Highly flexible, allows complex shapes; bridges can be placed in non-critical areas.
× Cons: Requires CNC milling, slightly higher cost.
Example:
4. Hybrid Panelization
Principle: Combines V-Cut, mouse bites, and other methods to optimize panel efficiency.
Typical Use Cases:
Mainboard with V-Cut + peripheral small modules with mouse bites.
Suitable for multi-type PCB panelization (e.g., main control board + antenna board).
5. No Panelization (Single PCB)
Applicable Scenarios:
Extra-large PCBs (e.g., industrial control boards).
Very low-volume production (e.g., prototype verification).
Comparison of Depaneling Processes
Classification of PCBA Depaneling Machines
Blade depaneling machine, PCB laser depaneling machine, PCB punch depaneling machine, blade-type depaneling machine, conveyor-type depaneling machine, manual push-type depaneling machine, fully automatic curve depaneling machine, fully automatic programmable curve depaneling machine, laser depaneling machine, semiconductor depaneling machine, etc.
PCBA Depaneling Methods
The following are several depaneling methods:
A. Manual Breaking + Filing Smoothing
- No quality assurance, prohibited.
Cross-section after manual depaneling
B. Punch Press Depaneling
- Fast speed but requires custom molds, long lead time, high cost.
- Generates stress during punching, posing a risk of damage to SMD components.
- Not recommended.
3. V-Cut Blade Depaneling Machine
Requirements for Panel Design:
Only supports straight cuts; specialized V-grooves must be designed in the PCB layout.
Disadvantages:
Generates sparks during cutting, potentially damaging the board.
Rough cut edges with burrs.
Status: Acceptable (with limitations)
4. Router-Based (Milling) Depaneling Machine
Panel Design Flexibility:
No limitations; supports cutting any shape.
Ensures high product quality.
Features:
Programmable curved depaneling overcomes the straight-line limitations of blade/push-type machines.
Uses a high-speed rotating milling bit to separate PCBs along pre-programmed paths.
Eliminates quality risks from manual breaking, V-Cut, or punch depaneling.
Recommendation: Highly recommended
5. Desktop CNC Router PCBA Depaneling Machine (Alternative Names)
Also Known As:
Milling-based PCBA depaneling machine
Router-based curved PCBA cutting machine
Router PCBA board cutter
Milling depaneling machine
Curved PCB depaneling machine
Programmable curved depaneling machine
Curved CNC depaneling machine
Fully automatic depaneling machine
Desktop CNC PCBA cutting machine
Router-based substrate separator
Fully automatic PCBA depaneling machine
Advantages:
Uses a high-speed milling bit to precisely separate multi-PCB panels along programmed paths.
Replaces manual/V-Cut/punch methods, eliminating cutting defects.
High precision, smooth edges, no burrs, long lifespan.
Dust-free, low stress, safe, and easy to operate.
Improves product quality and reduces scrap rates.
Current Technology:
Modern milling-based depaneling machines commonly use vision (Camera) alignment and inspection.
6. Laser Depaneling Machine
Advantage:
No mechanical stress on PCBs.
Limitations:
PCB thickness ≤ 1.2mm
Copper layers ≤ 4
Lower efficiency in some applications.
Best for: FPC (Flexible PCBs)
