Can I connect M.2 (B-key) to U.2 (SFF-8639)?

M.2 (B-key) and U.2 (SFF-8639) are not directly compatible. You will need a Active adapter to connect them.

Do I need an adapter for M.2 (B-key) to U.2 (SFF-8639)?

Yes, you need a M.2 (B-key) to U.2 (SFF-8639) adapter to connect M.2 (B-key) to U.2 (SFF-8639).

Will connecting M.2 (B-key) to U.2 (SFF-8639) cause signal loss?

No significant signal degradation is expected when connecting M.2 (B-key) to U.2 (SFF-8639).

M.2 (B-key) ↔ U.2 (SFF-8639)

Compatibility check and signal path analysis

Adapter Required

These connectors are not directly compatible. An adapter or converter cable is needed.

Recommended: M.2 (B-key) to U.2 (SFF-8639) adapter

Signal Path

M.2 (B-key) Unknown

Adapter

U.2 (SFF-8639) Unknown

M.2 (B-key)

Family Storage

Form Factor Card-edge socket

Pin Count 67

Reversible No

U.2 (SFF-8639)

Family Storage

Form Factor Dual-port wide

Pin Count 68

Reversible No

Notes

M.2 (B-key) to U.2 (SFF-8639): Both are storage connectors but may use different interfaces. An adapter or enclosure may bridge them, but speed will be limited by the slower interface. The M.2 (B-key) (Storage) and U.2 (SFF-8639) (Storage) share the same connector family.