M29F400FT55N3F2 - 4Mbit 5V Parallel NOR Flash 55ns | Micron
MPN: M29F400FT55N3F2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.24 | $2.24 |
| 10 | $2.05 | $20.50 |
| 100 | $1.86 | $186.00 |
| 500 | $1.68 | $840.00 |
| 1,000 | $1.51 | $1,510.00 |
Drop-in alternatives for M29F400FT55N3F2 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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M29F400FB55N3F2
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View Datasheet →M29F400FT55N3E2
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View Datasheet →M29F200FT55N3F2
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View Datasheet →M29F160FT55N3F2
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View Datasheet →M29F400FB55M3F2
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View Datasheet →M29F400FT55N3F2 Maximum Ratings & Electrical Characteristics
| Memory Type | NOR Flash (SLC) |
| Memory Size | 4 Mbit |
| Organization | 256K x 16 |
| Interface | Parallel |
| Access Time | 55 ns |
| Supply Voltage | 5 V |
| Block Architecture | Top boot block |
| Package | 44-SO (SOP-44) |
| Mounting Type | Surface Mount |
| Temperature Grade | Auto Grade 3, up to +125C (per Micron ordering code) |
| Compliance Suffix | F2 (RoHS-compliant, lead-free plating) |
| Programming Voltage | Single supply (no 12 V VPP required) |
| Technology | Floating-gate NOR cell, charge-pump program/erase |
M29F400FT55N3F2 44-so (sop-44) Pin Configuration Guide
Complete pinout information for M29F400FT55N3F2 (44-so (sop-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 M29F400FT55N3F2.
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
M29F400FT55N3F2 is suitable for 6 applications: Industrial Control Boot Firmware, Telecommunications Line Cards, Set-Top Box and Consumer Electronics, Legacy Embedded System Maintenance and Repair, Automotive-Grade ECU Code Storage, Networking Router Boot and Configuration Store.
Industrial Control Boot Firmware
Industrial PLC, motor drive and process-control boards built around 5 V microprocessors need deterministic boot code storage that survives power cycles and factory firmware updates. The M29F400FT55N3F2 fits this role because its 55 ns parallel access time allows the CPU to fetch boot code directly with minimal wait states, and its 5 V single supply matches the classic industrial logic rails, eliminating level shifters. The top boot block keeps the reset vector and boot loader in small protected sectors that are write-protected during normal operation, guarding against corruption from errant writes, while the larger lower blocks hold the application image and are erased selectively during field updates. In-system programming over the 5 V rail means no high-voltage supply is needed on the board, simplifying power design.
Recommended
Telecommunications Line Cards
Legacy telecom line cards and network interface boards often use 5 V buses and require firmware storage that supports long product lifetimes and field reprogramming. The M29F400FT55N3F2 provides 4 Mbit of code space organized 256K x 16, matching 16-bit processor data buses without external bus-width glue logic thanks to its x8/x16 selectable organization. Its 55 ns access time supports zero-wait-state or short-wait-state operation at typical line-card CPU clock rates, and the top boot block separates the boot loader from the downloadable application image so an interrupted firmware download never leaves the card unbootable. Single 5 V in-system programming via the standard command-set interface allows remote firmware update over the management bus, a common requirement in central-office equipment.
Recommended
Set-Top Box and Consumer Electronics
Set-top boxes, DVD players and similar consumer platforms based on 5 V-era chipsets historically stored boot code and firmware in parallel NOR Flash. The M29F400FT55N3F2 serves this market segment with 4 Mbit capacity for compressed boot code and configuration data, 55 ns access for fast power-on to logo, and a top boot block that isolates the secure boot region from the media-application firmware region. The 44-SO surface-mount package reflows on standard assembly lines, and the F2 suffix assures RoHS-compliant, lead-free soldering compatible with consumer manufacturing. Its parallel interface delivers direct CPU execute-in-place capability, removing the latency penalty of serial flash and supporting quick channel-change and startup behaviors demanded in consumer user experiences.
Recommended
Legacy Embedded System Maintenance and Repair
Service organizations maintaining 1990s and 2000s-era embedded equipment, from medical analyzers to test instruments, frequently need authentic 5 V parallel NOR Flash with the original command set. The M29F400FT55N3F2 is a direct fit for designs specified around the M29F400 family: identical 55 ns timing, 256K x 16 organization and 44-SO footprint mean the replacement drops onto the original PCB without layout or timing changes. The top boot map matches designs whose boot vector sits at the top of memory. Because Micron continued this family in RoHS F2 form, repair depots can stock it alongside the FB (bottom boot) variant to cover both boot-map conventions found in legacy boards, minimizing the spares inventory needed for multi-vintage fleets.
Recommended
Automotive-Grade ECU Code Storage
Powertrain and body electronics from the 5 V automotive generation stored ECU calibration and diagnostic firmware in parallel NOR Flash qualified to elevated temperatures. The M29F400 family ordering code includes an Auto Grade option with 125 degrees C operation, and the 55 ns speed grade is offered in conjunction with automotive temperature ranges, allowing this device to serve under-hood-adjacent modules and engine bay electronics. The block-protection architecture lets the ECU lock the boot region containing the watchdog and reset handler while leaving calibration blocks rewritable during service via diagnostic protocols. The 5 V supply directly interfaces with automotive 5 V sensors and microprocessor buses of that generation, and in-system programming supports end-of-line flash calibration without removing the device.
Recommended
Networking Router Boot and Configuration Store
Edge routers, switches and modems of the parallel-bus generation require fast, reliable boot code plus a protected region for MAC addresses and configuration data. The M29F400FT55N3F2 offers 4 Mbit in a 256K x 16 array with 55 ns access, letting the network processor begin executing from flash immediately after reset, and the top boot block reserves the highest sectors for boot code that field updates never erase. The x8/x16 pin-selectable organization lets one PCB design serve both 8-bit and 16-bit bus variants, reducing board SKUs. With single 5 V in-system write and erase, manufacturing lines can program serial numbers and provisioning data at final test, and the RoHS F2 construction satisfies global environmental compliance for network equipment sold in regulated markets.
Recommended
Recommended Products Summary
Engineering reference data for M29F400FT55N3F2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | M29F400FB55N3F2 | M29F400FT55N3E2 | M29F200FT55N3F2 | M29F160FT55N3F2 |
|---|---|---|---|---|---|
| Package | 44-SO (SOP-44) | 44-SO (SOP-44) - same | 44-SO (SOP-44) - same | 44-SO (SOP-44) - same | 44-SO (SOP-44) - same |
| Brand | Micron Technology | Micron Technology | Micron Technology | Micron Technology | Micron Technology |
| Memory Size | 4 Mbit | 4 Mbit | 4 Mbit | 2 Mbit | 16 Mbit |
| Organization | 256K x 16 | 256K x 16 | 256K x 16 | 128K x 16 | 1M x 16 |
| Access Time | 55 ns | 55 ns | 55 ns | 55 ns | 55 ns |
| Boot Block Location | Top boot | Bottom boot | Top boot | Top boot | Top boot |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| RoHS / Lead-Free Suffix | F2 (RoHS, lead-free) | F2 (RoHS, lead-free) | E2 (earlier lead-free generation) | F2 (RoHS, lead-free) | F2 (RoHS, lead-free) |
| Approx. Unit Price (qty 1) | $2.24 (as of 2026-09-05) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Top boot block matches top-of-memory reset vectors (vs M29F400FB55N3F2)
- Best supply-chain compliance generation (vs M29F400FT55N3E2)
- Balanced density/cost point in an identical footprint (vs M29F160FT55N3F2)
- More code space for growing firmware (vs M29F200FT55N3F2)
Design Notes
The 55 ns access time leaves little timing margin on heavily loaded buses. Keep address and data trace lengths short and reasonably matched, and limit bus loading to the capacitance assumed in the datasheet AC timing tables; each additional 50 pF of trace and fanout capacitance directly erodes the 55 ns budget. For long buses, consider series termination resistors (22-33 ohm) on address lines to control ringing, and verify chip-enable-to-output timing at worst-case temperature on your actual PCB, not just in simulation.
Plan block protection before production. The top boot block of the M29F400FT55N3F2 can be hardware-protected, and once protected, blocks cannot be reprogrammed without following the documented protection/unprotection sequences in the datasheet. A common field failure is firmware that accidentally issues an erase command to the boot region; either lock the boot blocks in production or ensure the download driver refuses erase operations above the application-region boundary. Also confirm the byte/word (BYTE#) pin is driven to a valid level at all times, since a floating BYTE# yields undefined bus behavior.
Decouple the 5 V supply with a 0.1 uF ceramic capacitor placed within a few millimeters of the VCC pin, plus bulk capacitance at the board level. Program and erase operations are charge-pump driven on-chip, so supply current spikes occur during write and erase pulses; a soft, low-impedance 5 V rail avoids brownout glitches on neighboring logic. Estimated: even a modest erase pulse current adds transient load in the tens-of-mA range on the 5 V rail, so size the regulator and decoupling for both the read-state baseline and the write/erase transient.
Place the 44-SO device so the address/data buses fan out with minimal stubbing, and keep the reset/power-down and write-enable lines short and away from noisy switching nodes. During PCB footprint creation, use the exact SO-44 land pattern from the Micron datasheet or IPC-referenced land pattern so that the FB (bottom boot) and lower/higher-density SO-44 family members remain drop-in options for future BOM flexibility.
Compliance Information
The F2 ordering-code suffix denotes Micron's RoHS-compliant, lead-free package construction per the datasheet ordering-information summary. REACH, halogen-free and conflict-minerals status were not stated in the provided web data.
