AM29F400B-55EI 4 Mbit Flash Memory - Storage Solution
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AM29F400B-55EI 4 Mbit Flash Memory | High-Performance NOR Storage in 48-Pin TSOP
The AM29F400B-55EI is a high-performance 4 Mbit parallel NOR flash memory designed to provide reliable and flexible storage for embedded systems. With an organisation of 524,288 bytes (or 262,144 words × 16-bit) in a 48-pin TSOP package, this flash device suits a wide range of applications — firmware storage on industrial controllers, code memory for legacy embedded designs, calibration data on test equipment, and any system that needs reliable JEDEC-standard NOR flash with a long write-cycle endurance budget.
The chip operates on a single 5.0V power supply for read, erase, and program operations — eliminating the need for a separate 12V Vpp during write cycles and simplifying the power architecture around it. Access times as fast as 70ns support direct execute-in-place (XIP) workloads on slower microcontrollers, and the embedded algorithms automate the erase and program sequencing without the host MCU having to manage every step manually.
High-Speed Performance and Versatile Operation for Reliable Data Storage
- Single 5.0V power supply — read, erase, and program from a single rail.
- High-performance access times as fast as 70ns — supports XIP workloads on standard MCUs.
- Low power consumption, including standby mode for battery-powered designs.
- Flexible sector structure for efficient data organisation in mixed-use storage.
- Embedded algorithms for automatic erase and program operations.
- Full chip erase and accidental write protection for data safety.
- JEDEC standards compatibility — pinout and software-compatible with the standard NOR flash family.
- Data# polling and toggle bit for operation completion detection.
- Erase suspend / erase resume for flexible erase operations.
- Guaranteed minimum 1,000,000 write cycles per sector — reliable for high-rewrite firmware update scenarios.
Where the AM29F400B-55EI Fits
NOR flash at this density and access time is the workhorse code-storage IC for industrial controllers, legacy embedded designs, and any system that needs to store firmware, parameter tables, or calibration data with high write-cycle endurance and direct memory-mapped reads. The 48-pin TSOP footprint is the standard form factor across the AM29F4xx family, so the part drops into existing designs as a pin-compatible replacement when the original chip is hard to source.
AM29F400B-55EI Technical Features
| Feature | Description |
|---|---|
| Memory Type | Parallel NOR Flash |
| Memory Organization | 4 Mbit (524,288 bytes / 262,144 words × 16-bit) |
| Package | 48-pin TSOP |
| Power Supply | Single 5.0V |
| Access Time | As fast as 70ns |
| Power Consumption | Low in standby and operation modes |
| Sector Structure | Flexible sector layout for efficient data organisation |
| Embedded Algorithms | Automatic erase and program sequences |
| Write Cycle Endurance | Guaranteed minimum 1,000,000 write cycles per sector |
| JEDEC Standards | Pinout and software compatible with single-supply flash memory |
| Operation Completion | Data# polling and toggle bit |
| Erase Suspend / Resume | Flexible erase operations with suspend / resume |
FAQ — AM29F400B-55EI NOR Flash
Q: Is this Top Boot or Bottom Boot?
A: The "B" in AM29F400B indicates the bottom-boot variant (boot block at low addresses). For the top-boot variant, look for AM29F400T.
Q: Can I program this with a standard universal programmer?
A: Yes — the AM29F400B is supported by all major universal programmers (XGecu T56, RT809H, MiniPro TL866II Plus, etc.) via the standard JEDEC parallel-NOR command set.
Q: What's the typical sector size?
A: The 4 Mbit array is divided into 11 sectors with a mixed boot-block + uniform-sector layout (the boot block is 16KB / 8KB / 8KB / 32KB at the boot end, and the rest are 64KB sectors).
Q: Does it work at 3.3V?
A: No — the AM29F400B is a 5V part. For 3.3V designs, use the AM29LV400B variant.
Q: Bulk pricing available?
A: Yes — email contact@lys-sz.com for tray-quantity pricing.
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Need AM29F400B-55EI in tray quantities for industrial firmware storage? Email contact@lys-sz.com for bulk pricing and lead times. Worldwide shipping from our Shenzhen warehouse.
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