M29F800FB55M3F2 - 8Mbit 5V 55ns NOR Flash SO44 | Micron
MPN: M29F800FB55M3F2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.58 | $55.80 |
| 100 | $4.96 | $496.00 |
| 500 | $4.34 | $2,170.00 |
| 1,000 | $3.72 | $3,720.00 |
Drop-in alternatives for M29F800FB55M3F2 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
M29F800FT55M3E2
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View Datasheet →M29F400FB55M3F2
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View Datasheet →M29F400FT55N3F2
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View Datasheet →M29F800FB55M3F2
✅ Drop-In✓ In Stock
$3.72 / Unit
View Datasheet →M29F200FT55M3F2
✅ Drop-In✓ In Stock
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View Datasheet →M29F800FB55M3F2 Maximum Ratings & Electrical Characteristics
| Memory Type | NOR Flash, Parallel |
| Density | 8389 kbits (8 Mbit) |
| Organization | 512K x 16-bit / 1M x 8-bit |
| Number of Words | 512 k |
| Bits per Word | 16 bits |
| Access Time | 55 ns |
| Supply Voltage (VCC) | 5 V |
| Boot Block Type | Bottom Boot Block |
| Interface | Parallel, Asynchronous |
| Programming | Embedded byte/word program algorithms |
| OTP Area | 64 byte |
| Operating Temperature | -40C to +125C |
| Automotive Qualification | Auto Grade 3 (temperature grade 3, +125C) |
| Package | 44-pin SO (SOIC-44) |
| Mounting Type | Surface Mount |
| Packing | Tape & Reel (T/R) |
M29F800FB55M3F2 44-pin so (soic-44) Pin Configuration Guide
Complete pinout information for M29F800FB55M3F2 (44-pin so (soic-44) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for M29F800FB55M3F2.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
M29F800FB55M3F2 is suitable for 6 applications: Automotive ECU Boot Code Storage, Industrial PLC Firmware Memory, Telecom Line-Card Code Storage, Legacy x86 Embedded Systems, Test & Measurement Equipment Firmware, Security and Access-Control Systems.
Automotive ECU Boot Code Storage
The M29F800FB55M3F2 fits automotive ECU firmware sockets because it is an Auto Grade 3 device rated -40C to +125C while keeping a 55 ns access time over that entire range, per the Micron M29F family datasheet. The 5V supply matches legacy 5V microcontroller buses in body, powertrain, and industrial-vehicle ECUs without level shifting. Its bottom boot block map keeps reset and interrupt vectors in small sectors, so routine vector-table or calibration-header updates erase and reprogram only 8-16 KB instead of a full 64 KB block, reducing service time and flash wear. Placed on the CPU's 16-bit external bus, the 55 ns device supports zero-wait-state XIP at moderate clock rates; verify wait-state settings against the actual MCU bus timing, since automotive 5V MCUs often run buses slower than the flash's capability, adding useful timing margin.
Recommended
Industrial PLC Firmware Memory
Programmable logic controllers and industrial drives commonly store firmware and configuration on 5V parallel NOR Flash because the bus interface is deterministic and asynchronous. The M29F800FB55M3F2's embedded program/erase controller removes firmware-side programming timing loops - the CPU simply issues commands and polls status bits, which simplifies in-field firmware update code. The 512K x 16 organization matches 16-bit industrial MCUs such as legacy C166 and 68K-family parts, and the 55 ns access time tolerates the -40C to +85C industrial envelope with margin to the device's full +125C rating. During field updates, the block-protection feature guards the boot sector against power interruption, a frequent hazard on factory floors. Design the update routine to verify status bits after each block erase rather than using fixed delays, as erase times vary with block history.
Recommended
Telecom Line-Card Code Storage
Legacy telecom and networking line cards built on 5V buses use the M29F800FB55M3F2 to store boot code, DSP firmware images, and board configuration. The asynchronous 55 ns interface connects directly to the line-card CPU without glue logic beyond standard chip-select decoding, and the 16-bit word mode halves footprint pressure versus byte-wide solutions by using the full DQ0-DQ15 bus. The 64-byte OTP area is valuable here for storing board serial numbers, MAC-address fragments, or factory calibration IDs that survive firmware reflashes. Telecom cabinets routinely reach 70C-85C ambient, well inside the device's +125C rating. During board bring-up, confirm BYTE# is strapped correctly for the intended bus width; the multiplexed DQ15/A-1 pin behaves differently in byte mode and is the most common integration error on this family.
Recommended
Legacy x86 Embedded Systems
5V x86-class embedded designs (386EX, 486-based SBCs, PC/104 stacks) fetch BIOS from parallel NOR at the top of the address space or at reset vector zero. The M29F800FB55M3F2's bottom boot block suits CPUs fetching from address 0, while the same-footprint FT variant suits sockets where the BIOS sits at the 1 MB top-of-memory boundary. With 55 ns access, the flash operates on the ISA/local bus at typical 8-16 MHz rates with zero or one wait state. The 1M x 8-byte mode directly mirrors the traditional byte-wide BIOS socket, enabling drop-in replacement of older 27C010/27C020 EPROMs where the carrier board provides WE#/OE# connections. Because program/erase needs no 12V VPP, in-system BIOS updates are practical with only the 5V rail present, matching the original AT power architecture.
Recommended
Test & Measurement Equipment Firmware
Bench instruments - oscilloscopes, power supplies, and signal generators from the 1990s-2000s 5V generation - store firmware and factory calibration tables in parallel NOR Flash. The M29F800FB55M3F2 serves both as new-design storage and as a service replacement for failing legacy Flash. Its -40C to +125C rating covers the upper temperature zones near power stages inside instruments, and the 55 ns access keeps calibration-table lookups on the processor bus without RAM staging. The separate small boot sectors let manufacturers revision the application image independently of the protected boot sector. For service depots, note that reprogramming requires asserting RP# high and issuing the unlock-command sequences exactly per the datasheet; skipping the reset-pin sequence after power-up is the most frequent cause of status-bit readback failures on the bench.
Recommended
Security and Access-Control Systems
Door controllers, alarm panels, and CCTV DVRs of the 5V era store firmware, user databases, and event logs on parallel NOR Flash. The M29F800FB55M3F2's block protection allows the security-critical boot sector to be hardware-protected against tampering, while the 64-byte OTP area stores device identity keys that cannot be rewritten - useful for anti-clone provisioning. The 512K x 16 array holds a typical controller firmware image plus an in-flash event log partition, and the 55 ns access supports real-time event servicing without copy-to-RAM latency. Outdoor-rated panels see -40C in winter and high enclosure temperatures in summer; the device's full automotive range covers both extremes. When implementing an event-log partition in Flash, wear-level by rotating across the uniform 64 KB main blocks, since erase endurance is finite per block.
Recommended
Recommended Products Summary
Engineering reference data for M29F800FB55M3F2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | M29F800FT55M3E2 | M29F400FB55M3F2 | M29F400FT55N3F2 | M29F200FT55M3F2 |
|---|---|---|---|---|---|
| Package | 44-pin SO (SOIC-44) | 44-pin SO (SOIC-44) - same | 44-pin SO (SOIC-44) - same | 44-pin SO (SOIC-44) - same | 44-pin SO (SOIC-44) - same |
| Brand | Micron Technology | Micron Technology | Micron Technology | Micron Technology | Micron Technology |
| Density | 8 Mbit | 8 Mbit | 4 Mbit | 4 Mbit | 2 Mbit |
| Access Time | 55 ns | 55 ns | 55 ns | 55 ns | 55 ns |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Boot Block Location | Bottom boot | Top boot | Bottom boot | Top boot | Top boot |
| Operating Temperature | -40C to +125C (Auto Grade 3) | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Organization | 512K x 16 / 1M x 8 | 512K x 16 / 1M x 8 | 256K x 16 / 512K x 8 | 256K x 16 / 512K x 8 | 128K x 16 / 256K x 8 |
Key Differentiators
- Bottom boot block layout (vs M29F800FT55M3E2)
- Full automotive temperature range (vs M29F400FB55M3F2)
- Capacity trade-off option (vs M29F400FB55M3F2)
Design Notes
Strap BYTE# correctly for the bus width before power-up. In word mode, pin DQ15/A-1 acts as DQ15; in byte mode it becomes the least-significant address A-1 and DQ8-DQ14 float. A wrong strap is the most common bring-up failure on the M29F800 family and can appear as reads of all 0xFF or shifted data. Tie RP# high through a pull-up (do not leave floating) because the device is in reset/power-down and cannot respond to commands when RP# is low.
Decouple VCC with at least 0.1 uF ceramic close to the package plus 4.7-10 uF bulk per device, because block-erase pulses draw current bursts on the 5V rail. The embedded program/erase controller needs a stable VCC within the datasheet range for the full algorithm; brown-outs mid-erase can corrupt the block, so add a supervisor (e.g., a 5V reset IC) that holds RP# low until VCC is valid. For in-system update designs, guarantee the 5V rail stays in regulation during the entire erase sequence.
Keep address and data traces short and length-matched loosely (asynchronous interface does not require tight matching); focus on clean return paths under the flash for reduced ring-back on the 55 ns edges. For drop-in footprint reuse across M29F400/M29F800 variants, confirm the family pinout handling of unused higher address pins on the 4Mbit devices before releasing the layout. Use a solder-mask-defined SO-44 land pattern per IPC guidance and verify with the package outline drawing in the Micron datasheet.
Status-bit polling (rather than fixed software delays) is the reliable way to detect program/erase completion: poll DQ7 for the complement of the programmed bit and check DQ5 for timeout. If your CPU prefetches or caches Flash reads, invalidate those buffers after issuing any program/erase command, or the status read may be served from cache and the driver will hang waiting for a bit that already changed.
Compliance Information
Part is designated Auto Grade 3 (-40C to +125C) per Micron family nomenclature, but RoHS/REACH/lead-free status for this exact suffix was not stated in the retrieved data. Note the family shipped both standard and 'E' (RoHS-compliant) suffixes; verify from the Micron product page compliance documents.
