Modern compact electronics especially wearables and AR/VR form factors push engineers into harsh tradeoffs:
less internal space, tighter stacking height, more assembly constraints, and yet the same expectation of stable charging and data connectivity.
The ultra-mini circular hole pin connector (D1.54×1.10) targets exactly this design space,
combining a very small footprint with a structure aimed at improving SMT robustness and final mating stability.
Witarea 1.54x1.10Circular Hole
This connector is built around an ultra-compact circular contact interface intended for power charging plus signal/data transfer in miniature products,
with the ability to scale from single-group to multi-group arrays. Witarea 1.54x1.10Circular Hole Figure 1 Product appearance & array concept From product overview:
appearance and multi-position application concept.
2) Key mechanical design features
2.1 Ultra-mini structure + defined materials
The structure calls out key components and materials: Shell (C2680), Claw Spring (C17200), and a Stopper (high-temperature plastic) a combination chosen for compact packaging and stable contact behavior.
Witarea 1.54x1.10Circular Hole
Figure 2 Structure & dimensions (D1.54×1.10 class) Structure breakdown and ultra-small structural dimensions.
3) Stopper design for SMT reliability
One practical failure mode in micro-connectors is solder paste contamination during reflow.
This design introduces a stopper function:
---During soldering, the stopper blocks solder paste from entering the interior of the connector.
---After inserting the male plug/pin, the stopper is ejected normally, allowing standard mating operation.
Witarea 1.54x1.10Circular Hole
Figure 3 Stopper function illustration Stopper helps prevent solder paste ingress during SMT and ejects upon mating.
4) Low mated height options (stack-up matters)
Ultra-compact products live and die by stack height. This connector highlights two integration paths:
--With PCB board connection pins: total mated height can be controlled within 1.70mm.
--With FPC connection pins: total mated height can be controlled within 1.50mm.
Figure 4 Mated height (PCB vs FPC)
Low-profile stack-up options: 1.70mm (PCB) and 1.50mm (FPC).
5) Technical parameters (quick spec)
Figure 5 — Datasheet spec table & structure size
Electrical / mechanical / environmental table and structure size figure.
6) Recommended advantages (why engineers pick it)
Engineering wins
--Ultra-small + low-profile stack: enables aggressive mechanical packaging (down to 1.50mm mated height with FPC approach).
--SMT robustness via stopper: reduces risk of internal contamination from solder paste.
--Power + signal/data in one interface: supports compact architectures that need both charging and connectivity.
System-level benefits
Scales from single to multi-group: useful for modular designs, accessory ports, compact docking pads, and internal board-to-board/FPC interconnects.
7) Applications (beyond the obvious)
The datasheet highlights Smart Glasses, Smart Wearable, Handheld terminal, Small Drone.
In addition, this kind of ultra-mini power+signal interconnect is commonly considered for:
AR/VR headsets and smart audio eyewear (internal module connections, charging contacts)
TWS earbuds / hearing devices (dock/charge + test/diagnostic contacts)
Medical wearables (patch modules, compact charging + data pads) Industrial handheld scanners and body-worn cameras (dockable I/O + charging)
Micro-robotics and gimbals (space-limited power + control signals)
Miniature sensor pods / IoT nodes (service port for charging + data)
Figure 6 Application scope illustration
8) Summary
If your product is limited by internal Z-height and still needs dependable charging plus signal/data connection,
the ultra-mini circular hole pin connector offers a practical, production-minded path:
low mated height, stopper-assisted SMT reliability, and power capability up to 3A at 5VDC.
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