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| Logo | Hitachi (circled "H" mark) |
| Part Number | HD404919 |
| Date Code | 9A1 — Year 1999, week A1 (Hitachi encoding) |
| Lot / Version | A08 |
| Origin | Japan |
| Manufacturer | Hitachi Semiconductor (now Renesas) |
| Family / Series | HMCS400 |
| Architecture | 4-bit CMOS single-chip microcomputer |
| ROM | 16,386 words (mask ROM) |
| RAM | On-chip (integrated) |
| Supply Voltage (Vcc) | −0.3 V to +7.0 V |
| Technology | CMOS |
| Package | DIP (Dual Inline Package), 42 pins (visible in image) |
| Related part | HD404918 (same family, different ROM configuration) |
| Typical applications | Consumer electronics, home appliances, remote controls, industrial control — typical use cases for HMCS400-series MCUs |
| Datasheet | 45 pages — available via Renesas / archived at alldatasheet.com |
| Status | Obsolete / legacy component (Hitachi semiconductor division absorbed by Renesas) |
⚠ The date code "9A1" follows Hitachi's proprietary encoding and the exact week interpretation may vary. ROM size (16,386 words) and Vcc range are taken directly from the published datasheet. No undocumented specifications have been assumed or invented.





Orders processed around 24hs from payment, including holidays