Draft for review. Confirm engineering data and editorial approval before publication.
Selection focus: CBB023 / CBB024 / CBB025 and CBB169 / CBB170. This guide provides a structured review method. It does not establish fit or qualification for a particular system. Use the linked product records and current controlled drawings as the factual basis.
1. Describe the actual misalignment
Floating travel is useful only when it is matched to the real assembly variation. Start with the relative positions of the two PCB datums after enclosure, fasteners and board fabrication tolerances are applied. Record lateral offsets separately along X and Y, and record the vertical stack tolerance along Z. Identify whether the movement occurs during mating, after mating or both. A single number called floating distance can hide a directional limit; request the controlled drawing and test definition for the exact model before assigning a design allowance.
2. Separate travel from clearance
Mechanical clearance around the moving connector is not the same as its specified travel. The surrounding housing, shielding and adjacent components must leave a free path, while the connector itself must remain inside the movement permitted by its construction. Draw the allowed envelope in each direction and overlay the worst-case PCB locations. If a fixture forces the connector beyond that envelope during assembly, the apparent ability to mate does not make the arrangement acceptable. Include board warp and mounting tolerance in the same review.
3. Compare candidate CBB series
The factory catalog includes CBB023, CBB024 and CBB025 as well as CBB169 and CBB170 records in the floating board-to-board portfolio. Compare their sourced pitch, contact count and mated height before examining movement. Similar names are not proof of a shared mechanical interface. Review the exact mating half and footprint for each candidate. If X, Y or Z travel is absent from a model-level source, leave it pending and request engineering confirmation rather than borrowing a value from another series.
4. Build a directional tolerance stack
Use a separate line for each direction in the tolerance stack. Add the location error from the first PCB, the second PCB, board supports and enclosure features. Record whether each value is a manufacturing limit, a measured prototype result or merely an estimate. The target travel should exceed the actual worst-case variation with an appropriate design margin determined by the engineering team. Do not turn a nominal catalog figure into an allowable misalignment without considering the test method and the mating state in which it was measured.
5. Protect the solder joints
A floating connector can move internally, but the PCB attachment still needs a sound mechanical load path. Review where assembly force, vibration and board bending enter the connector. Check pad geometry and any hold-down feature against the controlled drawing. Place supports so the boards do not use the connector as the only structural spacer. During a prototype build, inspect solder joints after repeated mating and after any intended motion. Record the actual conditions, since a visual pass alone may not reveal stress accumulated over time.
6. Check the mating sequence
Define how the connector halves find each other. If alignment features are present, inspect whether they engage before the contacts are loaded. Evaluate the approach angle, access for a fixture and the possibility of partial mating. A connector may accept a limited offset but still need a controlled insertion direction. Avoid assuming that floating travel corrects rotational error. The mating sequence should be repeated with boards at both ends of the expected positional range, using parts from the intended production variants.
7. Verify the signal path
Check the electrical assignment at the same time as the mechanical fit. Put signal, ground and power positions in a pin map, identify any current-sensitive contacts, and review the finished board or cable routing. Catalog electrical figures apply only under their stated conditions; a connector designation does not certify an entire channel. When a test requirement matters to the release decision, ask for model-specific evidence and note the exact condition, sample definition and acceptance criterion in your own design record.
8. Use current drawings
Request a controlled drawing for the exact ordering suffix, then compare its datum scheme with your PCB and enclosure model. A family illustration can show the type of interface, but it should not be used to release a footprint. Confirm the pad pattern, keep-out, part orientation and inspection access in a placement review. If the drawings for two mating halves carry different revisions, ask engineering to confirm that the combination remains valid before committing the board design.
9. Build representative prototypes
Evaluate a prototype with the complete mechanical stack, not a connector alone on a bare test board. Watch the approach direction, guide features, board flex and the space required by the operator or fixture. Record any interference or incomplete engagement with photographs and measurements tied to the actual parts. Repeat the check after enclosure and cable changes, since seemingly small packaging revisions can alter the insertion path or the force applied to the solder joints.
10. Ask for exact suffixes
Carry the complete part number through the engineering drawing, bill of materials and inquiry. A prefix alone may span several contact counts, heights or mounting details. State the quantity and project stage when requesting technical files or samples, and ask for current production status rather than inferring it from a catalog entry. Keep an explicit list of pending values so procurement does not turn an unconfirmed field into a committed requirement or an unintended substitute.
11. Document open values
Write the assembly requirement before selecting a part number. A useful brief identifies the board outline, mechanical datums, mating direction, contact assignment, expected quantity and project stage. It should also state the test evidence that your own product needs. Separate a required dimension from a preferred one so engineering can identify possible alternatives without silently changing the design target. Attach the latest layout drawing when asking for a connector recommendation, and record the revision used to make the initial comparison.
12. Finish with a paired review
Before design release, align the selected part, mating counterpart, current controlled drawings and validation plan in one review. Close every pending question or mark it as an open risk with an owner. Review the physical assembly, electrical path and service process together; a connector that fits the footprint may still be difficult to mate or inspect in the final enclosure. Preserve the approved document revisions and prototype observations so a later change can be assessed against the same baseline.
Related product records
Send the exact model and assembly requirements when requesting the latest controlled data. Where a page marks a value Pending confirmation, keep it open until engineering provides an authoritative answer.
For a practical review meeting, prepare one annotated assembly view, one contact assignment table and a short list of decisions that must be made before layout release. Mark each entry as confirmed by a controlled document, inferred from the current design or still open. This distinction helps mechanical, electrical and procurement teams discuss the same part without treating a draft assumption as a published specification. If the drawing or part number changes during the review, repeat the affected checks and record the new document revision beside the decision. Include the person responsible for each open item and the date of the next review so that missing evidence is visible before procurement or manufacturing makes an irreversible commitment.