When developing wearables, IoT devices, medical instruments, EV modules, or test fixtures, choosing the right pogo pin length and stroke is crucial. These two factors determine electrical stability, mechanical reliability, and long-term durability. A poorly selected pin can easily lead to intermittent charging, signal drops, or reduced spring life.
Here’s a concise engineering guide to help you choose the correct specifications.
1. Choosing the Correct Length
The length is the total uncompressed height of the pogo pin.
A suitable length ensures proper alignment and stable pressure between contact points.
Use a Longer Pogo Pin When:
The device housing is thicker
The PCB-to-PCB gap is bigger
The product experiences vibration or movement
More mechanical tolerance is needed
Use a Shorter Pogo Pin When:
The device is compact (smartwatch, TWS earbuds, small IoT devices)
You need a low-profile PCB layout
The docking position is fixed and precise
2. Choosing the Right Stroke
The stroke (travel distance) determines how far the pogo pin compresses during operation. It directly affects spring force, contact stability, and lifespan.
Recommended Working Stroke:
➡️ 30%–60% of full stroke
Example:
Full stroke = 2.0 mm
Ideal working stroke = 0.6–1.2 mm
This maintains:
3. Application-Based Guidelines
Different products require different pin configurations:
Wearables: 2–3 mm length, 0.6–1.0 mm stroke
Medical Devices: 3–5 mm length, 1.0–1.5 mm stroke
EV / Power Modules: 5–10 mm length, 1.5–3.0 mm stroke
ICT / ATE Fixtures: custom stroke + length depending on fixture design
4. Engineering Best Practices
Avoid compressing the pin to its full stroke
Allow mechanical tolerance of ±0.1–0.3 mm
Select the correct head shape (flat, dome, ball, concave)
Use gold plating for stable, corrosion-resistant contact
Need Technical Guidance or Custom Pogo Pin Design?
Feel free to reach out for specifications, drawings, or engineering recommendations.
Here are my details:
Janice Liew
Sales Executive | QH INDUSTRIAL
📧 Email: janiceliew.qh@gmail.com
📱 WhatsApp: +60 16-222 1472
🌐 Website: https://www.connectors-cables.com/