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AT88SC1616C-MJTG from Microchip Technology is a 16-Kbit secure EEPROM in an M2 J smart-card module configured for synchronous two-wire operation only. The exact MJTG order is not the ISO T=0 MJ module.
Exact ordering, memory organization, two-wire contacts and electrical limits were checked against the manufacturer's AT88SC1616C summary datasheet.
The AT88SC1616C contains 2,048 bytes of user EEPROM divided into sixteen 128-byte zones. Zone-specific access rights and on-chip cryptographic functions support protected storage and host authentication. The MJTG ordering combines the J-style M2 contact module with a two-wire-only interface.
Sixteen independently controlled 128-byte user zones can separate application data.
Mutual authentication, encrypted checksum and stream encryption protect authorized exchanges.
Synchronous serial access suits embedded readers designed for the TWI contact map.
The MJTG code identifies the round-glob-top M2 J module rather than the P style.
16 Kbit / 2 Kbyte user space in sixteen 1-Kbit zones.
A 2-Kbit configuration zone, OTP area and key/password area support personalization.
Programmable zone access rights, authentication keys and passwords protect user memory.
Power, ground, clock and bidirectional data are bonded; C2 is not connected.
The original catalog package is M2 J, Smart Card Module (TWI), matching the manufacturer's MJTG TWI ordering. The J module has a round glob top; the P module is a different mechanical style. The exposed metal contact area is listed as 12.6 by 11.4 mm in the summary datasheet; review the excised-module dimensions separately.

The registered M2 J JPG is unavailable on the production site and must be restored before publication.
The manufacturer's TWI-module pin-assignment table gives the following contact functions for this MJTG order.
Do not transfer the ISO MJ contact map, which bonds C2 to reset, to this MJTG TWI module.
| Exact order | AT88SC1616C-MJTG |
|---|---|
| Device family | CryptoMemory secure EEPROM |
| User EEPROM | 16 Kbit / 2,048 bytes |
| User zones | Sixteen 1-Kbit / 128-byte zones |
| Configuration zone | 2 Kbit |
| OTP area | 37 bytes |
| Key/password area | 160 bytes |
| Security functions | Mutual authentication, encrypted checksum and stream encryption |
| Interface | Synchronous two-wire only on this TG order |
| Supply voltage | 2.7 V to 5.5 V |
| Temperature class | Commercial, 0 to +70 degrees C |
| Package | M2 J smart-card module, TWI contact configuration |
Detailed timing and electrical design limits must be checked in the controlled manufacturer documentation.
The MJ order is an ISO module with a reset contact; MPTG uses a P-style TWI module. Neither is an unconditional replacement for MJTG. Compare contact bonding, reader mode, module geometry, memory zoning, security configuration and temperature class before considering another order. No unverified internal replacement link is provided.
The AT88SC1616C was originally documented under the Atmel name and is maintained by Microchip Technology. Microchip identifies the family as a mature product not recommended for new designs; confirm lifecycle and security suitability with the manufacturer for a new program.
Store protected data in a module connected to a compatible two-wire reader.
Assign separate access rights to logical data zones.
Use mutual authentication as part of a controlled host-device workflow.
Integrate the M2 J contact format where the application uses its TWI configuration.
Check the exact MJTG order code, module style, lot traceability and personalized security state. Protected storage and cryptographic capabilities do not establish that a delivered module has been correctly provisioned or authenticated.
Sixteen 128-byte zones provide 2,048 bytes of user EEPROM.
No. The manufacturer's ordering table identifies MJTG as the TWI-only M2 J module; MJ is the ISO order.
Not on the TWI module. The manufacturer's pin table lists C2 as no-connect for TWI.
Confirm the MJTG TWI-only order, C2 no-connect, supply and reader timing, module assembly dimensions and security personalization. The production M2 J JPG is missing; restore and visually verify it before publishing this page.
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