Microchip Technology AT88SC0204C-MJTG

The AT88SC0204C combines nonvolatile user storage with independently programmable zone access, symmetric mutual authentication, encrypted checksums, and stream encryption. The MJTG ordering code is a two-wire-only M2 J smart-card module. Its interface must not be confused with the ISO T=0 MJ version, even though both use the M2 J physical format.

The product catalog records M2 J, Smart Card Module (TWI), agreeing with the later manufacturer ordering table. The M2 J exposed contact area is 12.6 × 11.4 mm, with an 8.5 mm-diameter round glob top, nominal 0.58 mm thickness, and 14.25 mm carrier pitch. A punched module may measure larger than the exposed metal area. The workbook's canonical package name is M2 J; its descriptive entry says ISO and requires registry review, but that description must not override this order code's TWI designation.

Layout checks

• Verify the M2 J round-glob-top physical format.
• Align C1, C3, C5, and C7 to the reader contacts.
• Do not route unused TWI-module contacts as functional pins.
• Confirm excised module dimensions against the controlled drawing.

The registered M2-J JPG is absent locally and returns HTTP 404 on the production site; this draft cannot be published until the image and registry description are verified.

The contact map follows the 2015 manufacturer's TWI smart-card-module drawing for the CryptoMemory family.

C2 is a reset input only on the ISO module; it is unconnected on this MJTG TWI configuration.

Apply the detailed command timing, security setup, and test conditions from the controlled full specification; these summary figures are not unconditional guarantees.

AT88SC0204C-MJ shares the M2 J physical format but differs in protocol capability from MJTG. MPTG is a two-wire M2 P module with different glob-top construction. Neither variant is an unconditional substitute. Compare exact suffix, reader contacts, protocol, security personalization, temperature, and mechanics. No internal product link is added without exact API confirmation and a justified substitute relationship.

Microchip hosts both the 2013 AT88SC0204C summary datasheet and the later 2015 CryptoMemory full specification. The latter explicitly maps MJTG to M2 J–TWI. The older summary's ordering row says ISO for MJTG; its package note allows TWI, and the later full specification resolves the ordering-label inconsistency. Verify current revisions and lifecycle before procurement.

Check the full MJTG order code, round M2 J glob top, contact quality, carrier orientation, markings, traceability, and material documents. Validate two-wire communication and personalized security in production tests. A catalog listing does not prove source provenance or secure provisioning.

Security depends on correct host implementation, key provisioning, access control, and fuse programming. Use the later controlled manufacturer ordering table for this exact suffix and resolve the workbook's ISO description before release. Publication is blocked until the correct M2 J production JPG is accessible and visually verified.