This article reviews the main board-to-board alignment strategies and compares three of the most influential manufacturers in the sector: TE Connectivity, Amphenol, and Hirose Electric.
1. The problem: misalignment in board-to-board systems.
In assemblies with multiple boards (stacked or modular PCBs), even small tolerances cause problems:
X/Y axis displacements during assembly;
variations in height (Z axis);
deformations due to welding or automated assembly;
thermal expansion during operation.
Without compensation mechanisms, this results in:
mechanical stress in SMT welds;
intermittent contact failures;
and reduced system lifespan.
2. Modern board-to-board alignment strategies
Current solutions do not depend solely on mechanical precision, but on absorbing tolerance through design.
2.1. Floating (floating connectors)
This is the dominant strategy today.
It allows controlled movement of the connector within its housing.
It compensates for alignment errors in X and Y (and partially Z).
It reduces stress on solder pads.
Key concept: instead of demanding perfect precision, the system “adapts”.
2.2. Mechanical guides + self-alignment
Guide pins or dowels
Entrance chamfers
Alignment bushings
Used as a complement to the float to prevent excessive displacements.
2.3. Distributed tolerance (system-level tolerance)
The tolerance is redistributed between:
PCB
housing
connector
Reduces the requirement on a single piece
Widely used in modern automotive.
2.4. “Controlled compliance” connectors
Internal elastic elements
Contacts with springs or flexible structures
Absorb micro-movements during operation
3. Manufacturer Comparison
TE Connectivity
Focus: High-volume industrial and automotive solutions
Optimized designs for automated production
alignment strategy
in fine-pitch connectors.
Intensive use of controlled mechanical tolerances in housing.
Very strong in system-level tolerance design.
Technical Profile
Typical float: ~±0.6 mm
High contact density
Excellent robustness in mass production
Ideal for:
Industrial electronics,
Telecommunications,
Automated manufacturing systems
Amphenol
Focus: High electrical + mechanical performance.
Strong presence in advanced automotive.
alignment strategy
(e.g., FloatCombo-type platforms)
Designs that combine:
high current
, high speed,
high mechanical tolerance
Technical Profile
Float: up to ~±0.8 mm
High current per pin support
Excellent signal integrity at high speed
Ideal for:
Automotive (ADAS, ECUs, batteries),
Power and control systems
, Critical industrial electronics
Hirose Electric
Focus: Miniaturization and extreme mechanical precision
High-density compact electronics
Highly controlled floating
alignment strategy
. Optimization for SMT and precision assembly.
Design focused on reducing manufacturing tolerances.
Technical Profile
Float: ~±0.6 to ±0.8 mm
Very fine pitch (0.4–0.5 mm in advanced ranges)
Low current per pin (but high density)
Ideal for:
Advanced consumer electronics,
Medical devices,
Compact industrial systems
Technical Conclusion:
The design of modern board-to-board connectors no longer depends solely on mechanical precision, but also on how misalignment is managed.
TE Connectivity focuses on scalable industrial solutions with integrated floating connectors in mass production systems.
Amphenol excels in demanding environments that combine power, speed, and mechanical robustness.
Hirose Electric leads in miniaturization and precision for compact electronics.
