topic Re: FS26 - MICROCONTROLLER COMPATIBILITY in S32K

FS26 - MICROCONTROLLER COMPATIBILITY

ESof — Tue, 23 Jun 2026 08:24:34 GMT

Good evening,
I have the following questions regarding the FS26 - S32KXX family compatibility.
1-Is there a single orderable FS26 option compatible both with a s32k344 and s32k396?
2-what do the third and fourth last digits of the FS26 part number stand for? (i.e. MFS2633HMDE4AD referring to E4) Is the compatibility with a specific microcontroller defined in those digits?

Thank you

Re: FS26 - MICROCONTROLLER COMPATIBILITY

TomasVaverka — Tue, 23 Jun 2026 12:38:03 GMT

Hello Enrico,

No, there is no single pre-programmed, orderable FS26 part number that natively supports both MCUs.

Regarding the part number suffix (for example E4 in MFS2633HMDE4AD), this suffix represents a specific OTP/programmed variant. It is not by itself a generic MCU compatibility field. The actual base device capability is mainly defined by the FS26xyB/FS26xyD portion of the part number, which defines the silicon feature set (for example VCORE capability, number of trackers, LDT/FS1B presence and ASIL B vs ASIL D), while the suffix identifies the exact programmed version.

BRs, Tomas

Re: FS26 - MICROCONTROLLER COMPATIBILITY

ESof — Tue, 23 Jun 2026 12:44:48 GMT

Thank you for your answer.
-What makes a preprogrammed FS26 compatible with the s32k396 non-compatible with the s32k344, since the s32k344 has less current consumption compared to the s32k396?
-Is there a document that defines the various programmed versions?

Thanks,
Enrico

Re: FS26 - MICROCONTROLLER COMPATIBILITY

TomasVaverka — Tue, 23 Jun 2026 12:50:55 GMT

Hello Enrico,

Even if S32K344 has lower current consumption, a version programmed for S32K396 may still differ in voltage settings, sequencing, monitoring thresholds and safety configuration, so it should not be assumed to be interchangeable. The detailed programmed-version definition is provided in the FS26 datasheet, especially in the orderable part number tables, the OTP description section and the complete OTP content table referenced by the datasheet.

BRs, Tomas