News Letter has been released(2022.Apr)!! ~0.3N Low spring force connectors for Small/Slim devices

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In this month’s Yokowo Newsletter we will cover low spring force connectors and their applications.


【Reducing the pressure on a contact point】

Yokowo’s standard spring connectors have a spring force set at 1.08N (110gf).
Lower spring force type has a spring force as low as 0.3N (30gf).

【Background for Lower Spring Force Connectors

For devices that are small, thin, or with multiple contacts, the standard connectors’ spring force (1.08N) was often found to be too strong. Without a mechanical lock, the spring force could be large enough to lift the device to one side.

Originally, the lower spring force was one of our custom design options.
Now that we see that there is a growing demand for this feature, Yokowo has added it as one of its standard products.
Lower spring force connector Lineup

Enlarged view)​​​​​​
Note: planning to expand the list in the future.


【Reasons to Recommend a Lower Spring Force  】

1) It prevents damaging the mating pads even if the pads are made from softer materials.

In board-to-board applications, high spring force could result in distorting the opposing side.
Soft materials such as FPCs absorbs the pressure of the spring force as they aren’t rigid, which results to unstable electrical conduction.
2) Lower spring force is also recommended where spring pressure becomes a barrier for device-charger interfaces.
Charging cradles need to maintain a spring force that is lower than the weight of the device to properly charge.

It is a common challenge for small/light devices and docking stations because those devices tend to have many contacts for transmitting data between the docking station and device.
Spring Pressure is low enough to properly charge

3) Wide range of working heights, ranging from 2.5mm~3.5mm

​​​​​​Note: planning to expand the list in the future.

4) Additional custom design to the low spring force connector is available as well.

-Spec change
-Unique alignment and pin count
-Combined use of standard & low spring force connectors

Some options are available with no initial cost.
Please consult with us to optimize your connector design for your products.

【Application Examples】

1) Charging interfaces of earbuds/hearing aid devices

Typical earbuds/hearing aid devices has a charging case with a battery. Yokowo’s low spring force connectors are widely used as charging contacts.
An earbud is small and light, which is why a high spring force would not provide a secure contact between the earbuds and the charger.
2) Internal contacts for smart watches and wearable devices

Thinner, smaller, and lighter designs are preferred for wearable devices.
In order to keep a wearable device thin, the inner components tend to also be thin and lack mechanical strength. Standard connectors’ spring force could damage these components, and instead a lower spring force is desirable.

3) I/O Connectors for Smart meters and docking stations

When multiple types of signals are used for a device, the pin count for a connector increases.
As one standard connector’s force is just 1N, when used in a group the combined force can become very large.
The spring force of 3 low spring force connectors equals to one standard connector.

【Editor’s Notes】

Yokowo tries to make improvements and develop new products regardless of the specific market or products based on customer’s feedback
We are further increasing our standard catalog connectors in order to reduce the burden of customer’s design and initial costs. Also, we advise the best solutions based on our experience and achievements.
Please feel free to contact us if you have any requirements, inquiries, or questions.

■Previous Newslett​​​​er■

・Newsletter Mar.2022 ~Floating Spring Connector~

・Newsletter Feb.2022~High Current Connector~

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Apr, 2022