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ROHM Semiconductor BR93H66RFVM-WCTR — Interface & Transceivers

BR93H66RFVM-WCTR EEPROM, 4Kbit, AEC-Q100, 1.25 MHz, 8-MSOP

MPNBR93H66RFVM-WCTR
End of Life

ROHM BR93H66RFVM-WCTR Automotive AEC-Q100 EEPROM, 4Kbit (256 x 16), Microwire interface, 1.25 MHz clock, 2.7V to 5.5V supply, -40°C to 125°C, 8-MSOP package.

$0.65Ref. price · indicative, final on quote
ROHM Semiconductor BR93H66RFVM-WCTR datasheet (PDF)
Packaging8-VSSOP, 8-MSOP (0.110", 2.80mm Width)
RoHSROHS3 Compliant
SeriesAutomotive, AEC-Q100
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

BR93H66RFVM-WCTR specifications
ParameterValue
SeriesAutomotive, AEC-Q100
Memory typeNon-Volatile
MountingSurface Mount
Voltage2.7V ~ 5.5V
Frequency1.25 MHz
Memory interfaceMicrowire
Operating temperature-40°C ~ 125°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
TechnologyEEPROM
Memory size4Kbit
Memory formatEEPROM
Case8-VSSOP, 8-MSOP (0.110\", 2.80mm Width)
Memory organization256 x 16
Write cycle time - word, page5ms

Product details

Automotive-grade 4Kbit EEPROM for harsh environments

The ROHM BR93H66RFVM-WCTR is a 4Kbit serial EEPROM organized as 256 x 16 bits, using the Microwire interface at a 1.25 MHz clock rate. The supply voltage spans 2.7V to 5.5V, so it works on both 3.3V and 5V rails without a level translator.

Microwire interface and write timing

The Microwire interface is a three-wire serial bus (SI, SO, SK) with a chip-select line — simpler than SPI but limited to a single master. The 256 x 16 organization means each write handles 16 bits at a time; there's no byte-level granularity, so firmware needs to manage the 16-bit word alignment.

Housed in an 8-MSOP (2.80 mm width) surface-mount package, the BR93H66RFVM-WCTR fits a compact PCB footprint. The MSOP-8 body is common for serial EEPROMs.

It is ROHS3 Compliant, which keeps it usable for European and global production lines without exemption paperwork. The AEC-Q100 qualification is the main sourcing gate for automotive Tier-1 buyers: if your BOM calls for an automotive-grade serial EEPROM in this density, this part checks that box without requiring a separate PPAP document from the distributor.

Frequently asked questions

Is BR93H66RFVM-WCTR automotive qualified?

Yes, the BR93H66RFVM-WCTR is part of the Automotive, AEC-Q100 series, meaning it has passed the AEC-Q100 stress tests for automotive-grade reliability.

What is the memory interface of BR93H66RFVM-WCTR?

The memory interface is Microwire, a three-wire serial bus (SI, SO, SK) with a chip-select line. It operates at a clock frequency of 1.25 MHz and uses a 16-bit word organization (256 x 16).

Is there a direct replacement or equivalent for BR93H66RFVM-WCTR?

Within the same ROHM automotive EEPROM family, the BR93H86RF-WCE2 is a higher-density sibling (16Kbit, 1K x 16) with the same Microwire interface, same 1.25 MHz clock, and same 2.7V-5.5V supply range. It is also AEC-Q100 qualified and in an 8-MSOP package, making it a functional step-up if the BOM needs more storage. For a lower-density option, the BR93A46RFVT-WME2 (1Kbit, 64 x 16) runs at 2 MHz but with a 2.5V minimum supply and 105°C max temperature — check the voltage and thermal margins before substituting.