Short answer

A card socket connector — also called a card connector, card receptacle or card slot — is the electromechanical interface soldered onto a printed circuit board that holds a memory card or smart card, aligns it mechanically, and connects the card’s contact pads to the circuit. It is not a passive slot: contact normal force, coplanarity and the eject mechanism decide whether a device survives drop, vibration and 10,000 insertion cycles.

What is inside it

• Housing — LCP or PA9T, reflow capable at 260°C, holding terminal pitch to ±0.02 mm.
• Contacts — phosphor bronze or beryllium copper terminals with selective gold flash on the mating area; normal force typically 0.2–0.4 N per contact.
• Shell — stainless steel cover with SMT hold-down tabs that take the mechanical load away from the solder joints.
• Detect switch — a normally-open contact that tells the controller a card is present.
• Eject mechanism — push-push or push-pull cam and spring, or a hinged/tray type for space-limited designs.

Types mounted on PCBs

SD 8.0, Micro SD 7.1, SIM and Nano SIM (H1.15 / H1.1 profile), Micro SIM and Smart Card sockets. The electrical interface is defined by the card standard; the connector defines height, insertion force, retention and the footprint you have to route around.

Specs that matter when you select one

• Coplanarity within ±0.05 mm, or the part will tombstone in reflow.
• 10,000 mating cycles minimum for consumer and automotive use.
• Operating range −45 °C to 80 °C for in-vehicle and outdoor equipment.
• Insertion and withdrawal force matched to the enclosure, not to the connector alone.

MOARCONN in short

Card socket connectors made in our own mold, stamping and injection shops in Dongguan: 15 series and 163 part numbers, 0 MOQ, samples in 7 days, design-to-mold in 25 days, 7 million pieces per month, IATF 16949 and ISO 9001 certified, with 32 patents behind the contact and shell designs.