Mobile Internal Connectors
Spring finger contacts (also known as shield fingers, grounding springs, universal ground contacts, or clips) can be used in all types of small printed circuit board applications across all industries.
A spring finger is a single contact, surface mountable internal connector with multiple functions on a printed circuit board (PCB). It can be used for antenna feeds, low voltage electrical connections, or for grounding to prevent EMI noise and static caused by a speaker, motor, microphone, or any other vibration within an application. We continue to expand our spring finger contacts portfolio, offering a broad range of styles, heights, and materials to meet all customers’ needs.
A 360-degree view of our spring fingers – also known as shield fingers, grounding fingers, or universal contacts.
TE Connectivity offers a wide selection of scalable spring fingers as well as a complete family of spring fingers in a variety of styles and sizes. For each type of spring finger, TE Connectivity stands out with advanced automated production facilities which enable stability, reliability and excellence.
Our innovative scalable family of spring fingers is available in heights from 1.0mm to 3.8mm. All these types can be mounted onto one single footprint, so the product can be easily swapped when the design change is required.
Let’s take a close look at a scalable spring finger.
- The preload function nearly doubles the working area of a common spring finger and increases contact force by 0.2N.
- The dimple on the contact enhances the contact force.
- The backward-vended tip prevents hooking.
- The pick-and-place area supports auto-assembly processes.
- The holes increase soldering strength and reduce solder wicking issues.
While TE’s portfolio of spring fingers is the largest in the market, we are adding new side-protected scalable spring fingers to address common customer issues around problems that occur when large quantities of spring fingers are used.
The new, enhanced sidewall design prevents springs from being tangled by operator gloves and avoids deflection during PCB transfer.
All our spring fingers require very limited space on a printed circuit board and accommodate soldering as well as pick and place using standard equipment.
With the launch of spring fingers across a variety of industries, we are ready to help you to reduce design cost and accelerate time to market.
We are TE Connectivity. Please search: TE Spring Fingers for more information.
Download this spring fingers quick reference guide for a convenient summary of how spring fingers contacts are used, plus product tables detailing specifications for the products under all three types of spring fingers: standard-flat contact (box or C type), pre-loaded contact, and ultra low profile (Y type).
- Used for grounding between a device and PCB
- Provides shielding for anything that can cause vibrations within a device, such as motors, speakers, and microphones
- Provides a cost effective solution for antenna feeds in all types of devices
- Requires limited space on a PCB
- Used as a connection for simple stacking applications between primary and secondary PCBs
- Available in heights as low as 1.0mm and up to 4.3mm
- Accommodates soldering and pick and place, using standard equipment
- Mobile phones
- Wearable devices
- Game consoles
- Patient monitoring devices
- POS scanners
- Security systems
- GPS devices
Frequently Asked Questions
Spring Finger Contacts
|Why would I use a pre-loaded spring finger in an application?||A pre-loaded spring finger allows for the same amount of force with a smaller compression and provides a stable electrical contact with minimal deflection. These features are useful for applications with limited available height.|
|Which style of spring finger is best for my application?||Spring fingers are typically some of the last pieces added to a board. The type used depends upon the height and space left on the board, but the decision is typically based on your design needs.|
|Can I combine different types of spring fingers in an application?||Yes, an application can have multiple spring fingers of more than one type. For example, simple C types can be used for grounding between the device and the PCB, while multiple pre-loaded spring fingers are used on the board for shielding or other simple connections.|
|What are the benefits of using a scalable spring finger?||Scalable spring fingers use a common footprint, allowing easy design changes without requiring any extra space.|
These versatile contacts can be mounted on a single footprint so the customer can swap in a new size easily when a design change is needed.
- Eric Himelright,
- Vice President, Product Development