Mobile Internal Connectors for IoT
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. 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.
Higher Height Spring Fingers
TE Connectivity's (TE) higher height spring fingers offer an expanded portfolio of PCB universal ground contacts in higher dimensions, the portfolio now supporting a wide array of design needs from 0.8mm to 7mm, helping to protect sensitive devices from EMI noise and providing connection to ground. With a high current capacity and robust design features, TE spring fingers can support a diverse array of applications including consumer products, IoT, automotive, industrial and appliances.
- Higher height options allow designers to more easily meet distance/clearance requirements, enabling an easy and inexpensive method to connect multiple PCBs. Available in Pre-loaded Type, C Type, and Box Type, allowing for versatility in PCB layout.
- High-end performance characteristics (operating 0.5A to 2A), providing a reliable connection, helping to prevent EMI noise and static.
- Improved auto-assembly efficiency and increased ease of installation. Does not require expensive or specialized application equipment.
Ultra-Small Spring Fingers
- Save valuable PCB space with one of the smallest footprints at 1.7 mm2 in the market
- Closed-loop contact design ensures reliable connection to the PCB, better normal force and higher current capacity (1.5A)
- Robust side wall minimizes over-compression
- Special anti-lifting design can improve assembly efficiency by locking the tip of the contact within the sidewall of the spring finger, which helps prevent the contact from getting caught on an operator's glove during assembly
- Pick-and-place area supports auto-assembly processes
Spring fingers (also known as shield fingers, grounding springs, universal ground contacts or antenna clips) can be used in all types of small printed circuit board (PCB) applications across multiple industries.
Spring Finger Contacts
- 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 0.4mm and up to 7mm
- Accommodates soldering and pick and place, using standard equipment
Standard box and C-type connectors both have simple geometry for easy application.
Pre-loaded spring fingers are recommended when a stable electrical contact with minimal deflection is needed. The force change is minimized over the working range of the spring finger. Pre-loaded spring fingers are available in three scalable families.
Ulta low profile, Y-type spring fingers are used in applications where low effective heights are needed.
Offered in different heights and styles/form factors, ultra small spring fingers are used in a broad range of applications with space constraints across various industries.
Spring Finger Contacts
- Mobile phones
- Wearable devices
- Game consoles
- Patient monitoring devices
- POS scanners
- Security systems
- GPS devices
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.
Frequently Asked Questions
Spring Finger Contacts
Q: Why would I use a pre-loaded spring finger in an application?
A: 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.
Q: Which style of spring finger is best for my application?
A: 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.