Mid Mount USB C Connector — 24 Pin Double Shell, L=8.65mm, CL=0.32mm for Ultra-Thin PCBs

A 24 pin mid mount usb c connector places the mating opening partly inside a PCB cutout instead of sitting entirely above the board. On the F11, the body length is L=8.65mm and the recess depth is CL=0.32mm. This lower above-board profile matters when the enclosure is thin and the USB-C port sits close to the PCB surface. The mid-mount footprint is the mechanical feature; the double-shell body is the second distinguishing point.

The F11 uses two shell layers around the connector body, while the F10 is the single-shell mid-mount variant. The double shell affects the connector envelope, EMI shielding around the mating interface, and how the port fits a panel cutout. These two pages exist because the shell count is not a cosmetic difference. If the design calls for the single-shell envelope, the F10 page is the correct starting point. If the requirement is the double-shell mid-mount body with L=8.65mm and CL=0.32mm, this page applies.

On the electrical side, the F11 keeps the full 24-pin contact set: four VBUS pins, four GND pins, D+/D−, SuperSpeed TX/RX pairs, CC1/CC2, and SBU1/SBU2. That contact set is what separates a full-featured 24-pin receptacle from a 16-pin or 6-pin USB-C port. The mid-mount recess and the double shell change the mechanical envelope, not the contact assignment. Data rate and power delivery still depend on the host controller, device PHY, cable, and PD circuit on the same board.

The F11 sits in the USB-C receptacle product family alongside top-mount SMT, DIP+SMT hybrid, single-row SMT, and single-shell mid-mount models. It is not a replacement for those pages. It is the double-shell mid-mount 24-pin option for designs where the board height is constrained and the enclosure needs the port recessed into the PCB.

The L and CL values are the two dimensions that separate this mid-mount layout from a top-mount layout. L=8.65mm defines the body length; CL=0.32mm defines how far the connector sits into the board. Both should be taken from the current F11 drawing before the PCB cutout and keep-out are released. The 5A / 30V DC figure is a connector-level rating, not the delivered power of a finished product. USB PD wattage still depends on the PD controller, power supply, cable, thermal path, and protection circuit. For the official Type-C interface rules behind the 24-pin contact set, the USB-IF USB Type-C specification page documents the interface dimensions and pin functions.

A mid mount usb c connector l=8.65mm recess is useful when the product enclosure is thin and the USB-C port cannot sit fully above the PCB. The mid-mount structure lets the connector body drop into a board cutout, so the mating opening lines up with a lower panel opening. The double-shell body adds a second shell layer around the mating interface, which is the reason to choose F11 over the single-shell F10 when the design calls for that envelope.

Mid-mount is not a universal upgrade. It adds a PCB cutout requirement and changes the mechanical load path compared with a top-mount receptacle. If the enclosure is not height-constrained, a top-mount or DIP+SMT receptacle is often simpler to assemble. The F11 is intended for designs where the mid-mount recess solves an actual mechanical constraint and the double-shell envelope is part of the requirement, not as a default choice across every 24-pin project.

The 24-pin Type-C interface uses a symmetrical dual-row layout so the plug works in either orientation. The mid-mount recess and the double-shell body do not change the contact map; they change the mechanical envelope. The table below groups the 24 contacts by function.

The exact pin numbering for the A-side and B-side rows should be taken from the current drawing before PCB layout. For a full pin-by-pin table across USB-C receptacle types, the USB-C connector pinout guide includes the 24-pin front-view assignment and a comparison with 16-pin and 6-pin variants. The pin map is the same for the F11 double-shell mid-mount and the F10 single-shell mid-mount; the mounting and shell structure sit outside the contact assignment.

The 24-pin lineup has several variants that share the same contact set but differ in mounting, shell, and assembly process. The table below is a selection guide, not a ranking. The F11 and F10 are both mid-mount 24-pin receptacles with L=8.65mm and CL=0.32mm, but they are not the same connector: F11 is the double-shell variant, F10 is the single-shell variant. The shell envelope should be compared on the drawings before either part is designed in.

Among mid mount usb c connector options, the F11 should be selected on the shell envelope and the L/CL dimensions, not on the pin count alone. The 24-pin contact set is shared across these variants. If the design does not actually need a mid-mount cutout, a top-mount SMT or DIP+SMT receptacle is often easier to assemble. If the design needs a mid-mount but the envelope is different, the F10 or another mid-mount variant in the USB-C receptacle category should be compared before the PCB cutout is finalized.

A mid-mount connector requires a PCB cutout so the body can sit partly below the board surface. The cutout dimensions, the SMT land pattern, and the connector body keep-out should all be checked against the current F11 drawing. The locating features on the connector body should align with the cutout during placement, and the SMT pads should reflow with the rest of the top-side components.

For the SuperSpeed pairs, route the differential pairs according to the board stack-up and the controller requirements. For VBUS and GND, size the copper for the intended current with thermal margin; the 5A connector rating is not a substitute for adequate copper area. If the design uses the CC pins for PD negotiation, follow the USB-C controller’s routing guidance. The mid-mount recess does not change the signal routing rules; it changes where the connector body sits relative to the board.

Before release, confirm the cutout tolerance and the connector coplanarity against the F11 drawing. A mid-mount part with a PCB cutout has less room for placement error than a top-mount part, so the assembly house should review the cutout and the paste deposit on the anchor pads. If the line cannot handle a PCB cutout, a top-mount SMT receptacle is the simpler alternative.