Connector pitch is the center-to-center distance measured from one pin to the next pin in a connector. If the pitch on one side of your connector doesn’t match the other half, they won’t connect. Smaller pitches let you pack more connections into tight spaces, while larger pitches are easier to work with and more forgiving during assembly.
You’ll learn how to measure it correctly, what to consider when choosing a pitch size, and which types of connectors work best for different applications.
Understanding Connector Pitch
Connector pitch refers to the center-to-center distance between pins. It comes in standard sizes that determine how components fit together on your circuit board.
Definition and Measurement Methods
Pitch is the distance measured from the center of one pin to the center of the adjacent pin on your connector. You measure this spacing in millimeters or inches, depending on the standard you’re using.
To find the pitch, you measure between the center points of two neighboring pins. This measurement stays consistent across all pins in the same connector row.
Pitch Sizes and Standards
Common pitch sizes include 2.54mm (0.1 inches), which you’ll find in standard pin headers and female headers. Smaller pitches like 1.27mm, 1.0mm, and 0.5mm work well for compact devices.
Popular connector manufacturers like JST and Molex produce connectors in various pitch sizes to match different design needs.
Pitch Between Rows and Connector Layout
Pitch between rows measures the spacing from one row of pins to the next row in multi-row connectors. This vertical spacing affects your board layout and component density.
Design Considerations for Connector Pitch
Choosing the right connector pitch involves balancing space constraints with electrical performance and manufacturing requirements. The center-to-center distance between pins affects everything from board density to assembly costs.
Impact on Miniaturization and Manufacturability
Fine pitch connectors support miniaturization in devices like smartphones and tablets. Common pitch sizes include 0.5mm, 1.0mm, and 1.27mm for compact designs.
However, pitches below 0.8mm create manufacturing challenges. Your pick-and-place equipment needs higher precision, which can increase costs and reduce yield rates. FFC connectors and FPC connectors often use fine pitch designs for flexible cable assemblies but require careful handling during assembly.
Standard pitches like 2.0mm and 2.54mm offer easier manufacturability with lower costs and higher production yields.
Signal Integrity and Electrical Parameters
Pitch directly affects your connector’s electrical performance. Larger pitches provide:
- Higher current capacity and voltage ratings
- Lower contact resistance
- Better signal integrity
Fine pitch connectors handle less current per pin and have reduced voltage ratings due to closer pin spacing.
Connector Selection and Key Mechanical Factors
Your connector choice depends on mounting type. Through hole connectors offer stronger mechanical connections, while surface mount and press-fit options save board space.
Materials matter for reliability. Gold plating reduces contact resistance, while phosphor bronze and beryllium copper provide spring force. Housing materials like LCP and PA6T handle high temperatures.
Consider mating cycles for your application. Fine pitch connectors typically support fewer insertion cycles than standard pitch designs.
PCB Layout and Assembly Techniques
PCB layout must accommodate the chosen pitch. Fine pitch designs need tighter trace widths and smaller via sizes, which affects routing complexity.
Surface-mount technology works well for fine pitch PCB connectors, while through hole options suit larger pitches. Plan for proper clearances during cable assembly to ensure reliable connections in your final product.
Types of Connectors and Pitch Applications
Different connector types use specific pitch sizes based on their intended use. Manufacturers like JST and Molex offer standardized options for everything from industrial equipment to compact camera modules.
Popular Connector Series and Pitch Examples
JST and Molex dominate the connector market with series designed for specific pitch requirements. JST’s PH series uses 2.0mm pitch for general electronics, while their SH series offers 1.0mm pitch for compact devices. Molex provides the Mini-Fit series at 4.2mm pitch for power applications. PicoBlade series at 1.25mm pitch for space-constrained designs.
The 2.54mm pitch remains popular for through-hole applications where hand soldering is common. You’ll find 1.27mm pitch in applications requiring higher density than standard but not ultra-fine connections. For miniaturization in smartphones and cameras, 0.5mm and 0.4mm pitches handle the tight spaces.
Wire-to-Board and Board-to-Board Connectors
Wire-to-board connectors link cables to PCBs using pitches from 1.0mm to 5.08mm. The wire gauge determines minimum pitch requirements. Thicker wires need larger pitch spacing for proper crimping and strain relief.
Board-to-board connectors enable stacking of PCBs in devices. Fine-pitch versions at 0.4mm to 0.8mm support high-density signals in compact electronics. Standard pitches of 2.0mm and 2.54mm work for industrial applications where durability matters more than size.
Your choice affects signal integrity. LVDS signals in display connections often use 0.5mm pitch connectors with proper shielding.
FPC/FFC and Fine-Pitch Connectors in Modern Devices
FPC (Flexible Printed Circuit) and FFC (Flat Flexible Cable) connectors use pitches as small as 0.3mm in modern smartphones and camera modules. These support miniaturization while maintaining reliable connections for displays and sensors.
Common FPC/FFC pitches include 0.5mm, 1.0mm, and 1.25mm. Camera modules frequently use 0.4mm pitch to accommodate multiple signal lines in tiny spaces. The solder process for these fine-pitch connectors requires precision equipment and controlled environments.
Specialized Features: Locking, Sealing, and Keying
Locking mechanisms prevent accidental disconnection. Friction locks provide basic retention, while TPA (Terminal Position Assurance) and push-pull designs offer more security. Push-pull connectors work well in tight spaces where you can’t access both sides.
Keying prevents incorrect mating by using asymmetric designs or polarization features. This protects circuits from damage caused by reversed connections.
Environmental sealing uses IP67, IP68, and IP69K ratings. IP67 handles dust and temporary water immersion. IP68 offers extended submersion protection. IP69K withstands high-pressure, high-temperature washdowns. These sealed connectors typically use larger pitches (1.25mm and above) to accommodate gaskets and robust housings.
Keep Your Connections Last with Seetronic
At Seetronic, a leader in technical innovation, we specialize in high-end connectivity solutions designed to withstand the rigorous demands of the global audio, video, lighting, and renewable energy sectors. Our connectors are engineered with the perfect pitch and mechanical integrity to ensure your systems perform under any conditions.
Ready to elevate your design? Request a Quote today through our streamlined contact form and let us provide the reliable foundation your technology deserves. Our expert team is here to help you select the ideal connection architecture.
Frequently Asked Questions
What does pitch mean in an electrical connector?
Pitch is the center-to-center distance between adjacent pins or contacts in your connector. It’s measured from the middle of one pin to the middle of the next pin.
This spacing determines whether your connector will fit your PCB footprint and mate properly with its partner. A 2.54 mm pitch connector won’t work with a 2.0 mm pitch socket.
How do I measure the distance between pins to find the pitch?
Use digital calipers to measure from the center of one pin to the center of the next pin. For better accuracy, measure across multiple pins and divide by the number of gaps.
For example, if you measure 10.16 mm across five pins, you have four gaps. Divide 10.16 by 4 to get 2.54 mm pitch.
How can I choose the right pitch size for my PCB and component spacing?
Pick smaller pitches (0.5–1.0 mm) when you need to save board space in compact devices. Choose larger pitches (2.54–5.08 mm) when you need higher current capacity or easier assembly.
Match your connector pitch to your PCB pad spacing exactly. Check your voltage requirements too—larger pitches provide better electrical clearance.
Where can I find a simple pitch chart that compares common connector sizes?
Common pitches include 0.5 mm for phone displays, 1.27 mm for ribbon cables, 2.54 mm for standard headers, and 5.08 mm for power terminals. Each pitch suits different current ratings and space constraints.
Your connector supplier’s datasheet lists exact pitch dimensions and tolerances.
What’s the difference between pin pitch and row pitch on multi-row connectors?
Pin pitch measures the spacing between pins in the same row. Row pitch measures the distance between parallel rows of pins.
A dual-row header might have 2.54 mm pin pitch but only 2.0 mm row pitch. Both measurements matter for your PCB layout.
How do 4.3-10 and 7/16 connector types differ, and when should each be used?
These are RF coaxial connectors, not pin-type connectors. The 4.3-10 connector works up to 6 GHz and handles 500 watts. The 7/16 DIN connector works up to 7.5 GHz with 1,000+ watts.
Use 4.3-10 for compact cellular base stations. Choose 7/16 for high-power broadcast equipment.
