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JAE Announces the WP56DK Series Board-to-board (FPC) Connector Achieving 0.3mm Terminal Pitch

WP56DK series connector

October 15, 2020
JAE has launched the WP56DK Series stacking type board-to-board (FPC) connectors that are ideal for use in wearable devices such as smartwatches and smart glasses. The WP56DK Series is an ultra-compact connector with power supply terminals, 1.6 mm width, and 0.6mm mated height. It achieves a 0.3mm terminal pitch, which is the smallest in the industry.

Recently, in high-performance compact wearable devices such as smartwatches, the PCB found inside of these devices is much smaller than those inside of smartphones, which requires components used in these devices to also be much smaller and high density. While the overall device size is decreasing, the functions and features found in these devices continue to evolve and grow, further emphasizing the need for higher density components such as connectors. For smartphones, mounting space of connectors are becoming more high-density due to the increasing number of camera modules.

To cater to these needs, JAE has launched the 1.6 mm width WP56DK Series Board-to-board (FPC) Connector with the industry’s narrowest terminal pitch of 0.3mm.

By reducing the terminal pitch to 0.3mm, which is a reduction of 0.05mm compared to our conventional connectors, the connector length will be reduced by 0.7mm for a 30 position connector. This product adopts our standard multifunction hold-downs which allows them to be used as a power supply terminal to reduce total pin count and the size of the connector. In addition, the hold-downs also incorporate protective metal fittings which provide armoring on the mating and internal surfaces of the insulator for ultimate strength and reliability. Due to this structure, the connector has improved workability during the alignment and mating process.

*Hold-down: Metal fittings to help hold connector to board
*FPC: Flexible Printed Circuits
WP56DK Series Product Example

Product Line-up

WP56DK Series Variation


  • 0.3mm pitch, narrowest in the industry
  • 1.6m width, 2 rows, 0.6mm mated height
  • 2 power supply terminals supporting 3.0A each (Also serving as a hold-down)
  • Hold-down structure adds protection to the top mating surface to prevent damage to the insulator (Armored)
  • Improved workability for assembler with clear click feeling when fully mated
  • 2 point contact structure for reliable connection
  • Nickel barrier on contact prevents solder wicking

Applicable Market

Smartwatches, smartphones, tablet PCs, laptops, digital cameras, AR / VR headsets and other small mobile devices

General Specifications

Pitch 0.3mm
Number of Contacts 26 positions (+2 power)
Mated Height 0.6mm
Operating Temperature Range -40°C ~ +85°C
Contact Resistance Signal Terminal: 70mΩ max. (initial)
Power Supply Terminal: 20mΩ max. (initial)
Durability 30 mating cycles
Rated Current Signal Terminal: AC, DC 0.3A per pos.
Power Supply Terminal: AC, DC 3.0A per pos.
Rated Voltage AC, DC 50 V
Insulation Resistance 100MΩ min. (initial)
Dielectric Withstanding Voltage AC250V rms.

Materials and Finishes

Components Materials / Finishes
(Plug / Receptacle)
Copper alloy / Au plating
Insulator Heat-resistant plastic
(Plug / Receptacle)
Copper alloy / Au plating

Related Products

JAE offers a lineup of board-to-board, external interface, FPC/FFC, and card connector solutions which contribute in space-saving and enhancement of functionality in small devices such as smartphones, tablets, and wearable devices.

Information and details given here are as of the date of publication. Please note that the details may be changed.