Deep Dive: SD Card Connector Design & Structure Explained

An SD card connector is a mechanical and electrical interface that enables the connection between an SD card and a device’s circuit board. It plays a crucial role in ensuring stable data transmission and physical durability in a wide range of applications.

Contact Pins: Typically 8 or 9 gold-plated pins ensure stable signal and power connection.

Insertion/Ejection Mechanism: Includes push-push, push-pull, and hinged types for different design needs.

Housing & Shell: Often made of high-temp plastic or metal, ensuring alignment and protection.

Impedance Control: Match 50Ω for high-speed signal integrity.

Trace Lengths: Keep clock and data lines short and matched.

Pull-Up Resistors: Place near the connector for signal stability.

Grounding & Shielding: Use continuous ground plane under traces.

Insertion Cycles: Industrial-grade connectors support 5,000–10,000 cycles.

Operating Environment: -40°C to +85°C for rugged applications.

Material Selection: Contacts use gold plating; housings use LCP or PA9T.

Consumer Electronics: Smartphones, cameras, tablets

Industrial Equipment: PLCs, IoT modules, smart meters

Automotive Systems: Infotainment, navigation, dashcams

Medical Devices: Portable monitors, data loggers

15 Years of Expertise

MoarConn has over 15 years of experience specializing in precision connectors, offering complete solutions from mold design to metal stamping and plastic injection.

Customization & Rapid Prototyping

Support for SD7.0, SD8.0, microSD formats, with push-push, push-pull, and hinged types. Samples ready within 25 days, MOQ-friendly customization supported.

 High Durability & Quality Control

All connectors meet RoHS/REACH standards and pass 5000+ insertion tests. Strict QC throughout production ensures reliability.

 Full Application Coverage

From consumer electronics to industrial-grade designs, MoarConn connectors are widely adopted by global clients.

Visit us at: www.moarconn.com

Challenge: Compact space, high vibration, long lifespan required.

Solution: MoarConn supplied a 2.25mm ultra-slim push-push Micro SD 7.0 connector, supporting hot swap and stable high-speed transmission.

Results: Improved system integrity, enhanced customer satisfaction.

Understanding the internal design, structure, and application of SD card connectors is vital for selecting the right component in high-reliability devices. MoarConn offers industry-proven, customizable solutions that meet modern design challenges and evolving performance standards.