Home / Connector Glossary
Terms that appear on KINGCONN product pages and drawings, each with an engineering definition and the part numbers on this site that carry it; the counts are computed from the part pages and drawing data.
Push-push; Non-eject / slide-in slide-out; Hinge type; Card detect switch; Lock type; Normal type; Reverse type; Positioning post; SMT and DIP; Vertical and right angle; Contact pitch; Mated height / stack height; Contact count; Durability; UL94V-0; Gold flash and gold thickness; Phosphor bronze and copper-alloy contacts; RoHS; SD Express; CFexpress Type A; M.2 key
Browse by type: push-push card sockets; non-eject card sockets; reverse-type connectors; card sockets with positioning post
An eject mechanism that holds the card with a spring-loaded cam: the first push seats and latches the card, a second push ejects it. The latch, not friction, retains the card; insertion ends with a definite click and removal needs no tool.
On this site: 43 models, 11 series. Browse by type →
A card socket with no eject spring or cam: the card is pushed in and pulled out by hand and retained by contact normal force and the housing walls. Fewest moving parts of the three eject mechanisms and the easiest to make low-profile. KINGCONN catalogue wording varies by series — Simple Type, NON PUSH, NO push or Header — all meaning this mechanism.
On this site: 16 models, 8 series. Browse by type →
A card socket whose metal cover swings open on a hinge: the card is laid into the seat, then the cover is closed and latched. Suited to cards fitted during assembly and not removed afterwards; the lowest of the three mechanisms, at the cost of needing clearance above the socket to open the cover.
On this site: 4 models: 7MSDH-F0-1012; 7SIMC-AA-0006; 7SIMC-FA-0004; 7SIMC-F0-0023
An extra contact pair inside the socket that closes or opens when the card is fully seated, telling the host board that a card is present; some parts add a write-protect (WP) detect. Polarity (normally open or normally closed) is defined on the drawing and must be checked when substituting a part.
On this site: 1 model: 7MSDP-F0-0029
A variant that adds anti-loosening retention to the basic mechanism: a push-lock card socket adds a latch after the card is seated, and a screw-lock D-SUB clamps the mating connector with screws. Used where vibration or accidental removal is a concern.
On this site: 2 models: 7CFST-CA-0017; 7SDCN-F0-0019
The mounting orientation in which the card or plug contact face points the standard way, as opposed to reverse type. Normal and reverse parts of the same interface have mirrored footprints and pin order and are not interchangeable on one layout.
On this site: 10 models: 7CFHD-F0-0010; 7CFHD-F9-9008; 7CFST-CA-0002; 7DDR2-F0-0002; 7DDR4-F0-0007; 7DDR4-F0-0008; 7DDR5-F0-0001; 7MSMS-X9-0004 …
The mounting orientation with the contact face pointing the opposite way to the normal type: used when the connector sits on the other side of the PCB or the card must insert label-side down. Footprint and pin order are mirrored, so it is not a substitute for the normal type.
On this site: 11 models, 7 series. Browse by type →
A cylindrical peg moulded into the underside of the housing that drops into a matching PCB hole: it locates the connector mechanically before reflow and shares the side load during insertion. Parts described as No Post / Postless have none.
On this site: 5 models, 2 series. Browse by type →
SMT (surface-mount) parts have solder tails that sit on pads and are reflowed; DIP (through-hole) parts have tails that pass through plated holes for wave or hand soldering. DIP takes mechanical stress better, SMT uses less board area and allows double-sided assembly; many series offer both.
On this site: SMT: 21 models; DIP: 9 models
A vertical (straight) part mates perpendicular to the board, the plug entering from above; a right-angle part mates horizontally from the board edge. Vertical trades height above the board for a footprint that does not use the board edge.
On this site: vertical: 2 models
The centre-to-centre distance between adjacent contacts, in mm. It sets the routing density on the board and the alignment tolerance: a finer pitch uses less board area but demands tighter placement.
On this site: 90 drawings state this value, range 0.4–3 mm
The height after mating: for board-to-board connectors the distance between the two boards, for card sockets and I/O connectors the height of the body above the board. Once the enclosure is fixed it is the one parameter that cannot be tuned, so selection should start from it.
On this site: 68 drawings state this value, range 0.55–15 mm
The total number of signal and power contacts, set by the interface standard (an SD card socket has 9, a microSD socket 8). Many series offer several counts so a late change in signal count can stay within the same footprint family.
On this site: 69 drawings state this value
The number of insertion and withdrawal cycles stated on the drawing within which contact resistance and mechanical function stay within specification. Check it for slots that users swap cards in; part numbers whose drawing does not state it show no value on this site.
On this site: 82 drawings state this value, range 60–1,000,000
The V-0 grade of the UL 94 plastics flammability standard: a vertically mounted specimen self-extinguishes within the specified seconds and does not drip flaming particles. The usual flame rating for connector housings, stated in the material line of the drawing.
On this site: 139 drawings state this value
A very thin gold layer on the contact area (drawings write gold flash or G/F) over a nickel underplate; thicker specifications are given in micro-inches (10u", 15u", 30u"). Thicker gold improves corrosion resistance and durability at higher cost. Solder tails are usually tin-plated.
On this site: 38 drawings state this value
The spring copper alloys used for contacts: phosphor bronze combines spring properties with fatigue resistance and is the most common card-socket contact material; drawings may also state copper alloy or brass. The material sets contact normal force and durability and is stated per part on the drawing.
On this site: 51 drawings state this value
The EU directive restricting specified hazardous substances (lead, mercury, cadmium, hexavalent chromium and others) in electrical and electronic equipment. RoHS compliance is stated on the drawing, and the RoHS line on each part page is taken from it.
On this site: 223 drawings state this value
The SD Association card and slot standard that added a PCIe/NVMe interface in SD 7.0, with SD 8.0 raising lane count and generation. An SD Express socket carries a second contact row and differs from a UHS-I socket; backward compatibility is defined by the specification.
On this site: SD 7.0 & SD 8.0; SD 7.0 / SD 8.0 (SD Express) Card Connector Guide
The smallest form factor (Type A, one PCIe lane) of the CompactFlash Association card standard based on PCIe/NVMe; Type B shares the XQD form factor. The CFexpress socket KINGCONN currently publishes is Type A.
On this site: 7CFEA-C0-0001
The notch position on an M.2 module edge and the matching rib in the socket that prevent a module being seated in a slot whose signals it does not support: M key for PCIe ×4 / SATA SSDs, B key for SATA SSDs and WWAN, E key for wireless modules. See the M.2 key guide.
On this site: M.2 Key Types (A / B / M / E), M.2 Sizes and the M.2 Connector