M29F400FT55M3E2 - 4Mbit 55ns 5V Parallel NOR Flash | Micron
MPN: M29F400FT55M3E2 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.84 | $2.84 |
| 10 | $2.62 | $26.20 |
| 100 | $2.41 | $241.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.98 | $1,980.00 |
Drop-in alternatives for M29F400FT55M3E2 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
M29F400FT55M3F2
β Drop-Inπ Reference alternative (not in catalog)
M29F400FB55M3E2
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View Datasheet βM29F400FT55M32
β Drop-Inπ Reference alternative (not in catalog)
M29F400FB5AM62
β Drop-Inπ Reference alternative (not in catalog)
M29F400FT55M3E2 Maximum Ratings & Electrical Characteristics
| Memory Type | NOR Flash |
| Memory Size | 4 Mbit (4194 kbits) |
| Organization | 512K x 8 / 256K x 16 |
| Interface | Parallel |
| Access Time | 55 ns |
| Supply Voltage | 5 V |
| Number of Words | 256 k |
| Bits per Word | 16 bits |
| Programming | Embedded byte/word program algorithms |
| Erase | Embedded program/erase controller, block erase |
| Boot Block | Top boot block |
| Operating Temperature | -40 C to +125 C |
| Package | 44-SO (SOP-44) |
| Mounting Type | Surface Mount |
| Packaging | Tray |
| RoHS Status | Compliant |
M29F400FT55M3E2 44-so (sop-44) Pin Configuration Guide
Complete pinout information for M29F400FT55M3E2 (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 M29F400FT55M3E2.
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
M29F400FT55M3E2 is suitable for 6 applications: Industrial PLC and Motor Drive Firmware Storage, Telecom and Networking Line Card Boot Code, Automotive Module Software Store, Legacy Embedded Controller Upgrades and Repair, Test and Measurement Instrument Firmware, Security and Surveillance Controller Firmware.
Industrial PLC and Motor Drive Firmware Storage
The M29F400FT55M3E2 fits industrial PLC and motor drive designs because its single 5 V supply matches legacy industrial power rails and its 55 ns access time supports execute-in-place code execution from the host processor's parallel bus. The embedded program/erase controller sequences byte programming and block erase autonomously, so field firmware updates do not burden the main CPU with timing loops. Top boot block protection keeps reset and interrupt vectors intact during in-field updates, improving system robustness against brown-out conditions during reflashing. The -40 C to +125 C operating range covers uncontrolled factory-floor cabinets. Place the memory on a short, matched address/data bus with 4.7 kohm pull-ups on control lines; unlike serial Flash, no configuration sequencing is needed, but ensure the 5 V bus meets setup and hold timing with the processor at maximum frequency.
Recommended
Telecom and Networking Line Card Boot Code
Telecom line cards traditionally store boot code and golden images in parallel NOR Flash; the M29F400FT55M3E2 provides 4 Mbit in a compact 44-SO package with a 55 ns access time adequate for early boot code execution before faster memory takes over. The 5 V interface is common on legacy central-office equipment, avoiding level-shift circuitry. Block erase organization supports A/B firmware image schemes: one block region holds the fallback image while the other is updated, with the protected boot blocks guaranteeing recovery even if a power failure interrupts an update. Embedded program/erase algorithms reduce driver complexity in long-life telecom platforms where software change cycles are slow. Design consideration: parallel buses radiate more EMI than SPI; use controlled impedance traces and series resistors on data lines to meet telecom EMC emission limits.
Recommended
Automotive Module Software Store
Automotive body and comfort modules frequently use 5 V microcontrollers with parallel memory buses, and the M29F400FT55M3E2's -40 C to +125 C operating range aligns with under-hood and engine-bay-adjacent environmental requirements. The 4 Mbit density stores calibration data plus application firmware, and the top boot block organization protects the diagnostic/bootloader region that must survive every reflash session. Its embedded program/erase controller ensures correct programming voltage and timing internally, which is essential for production-line EOL programming over diagnostic interfaces. Note that formal AEC-Q100 qualification status should be confirmed with Micron for safety-relevant positions. Layout-wise, keep the 44-SO device within 50 mm of the MCU bus, and add bulk 10 uF plus 0.1 uF decoupling at VCC to absorb program current spikes during block erase operations.
Recommended
Legacy Embedded Controller Upgrades and Repair
Service and repair of legacy embedded controllers often requires exact-form-factor replacement of failed NOR Flash. The M29F400FT55M3E2 matches the widely deployed M29F400 44-SO footprint, and same-family parts M29F400FT55M3F2 and M29F400FT55M3T2 offer identical electrical performance per FindIC cross-comparison, enabling repair without PCB or firmware changes. The 55 ns access time preserves original bus timing margins even in systems designed around 70 ns or faster devices - verify only that the replacement speed grade is equal or better. The 5 V supply suits equipment predating 3.3 V logic, where the parallel address/data bus remains at TTL levels. For inventory-pooling repair shops, stocking one top-boot and one bottom-boot variant covers the complete M29F400 installed base, with M29F400FB55M3E2 covering the bottom-boot population.
Recommended
Test and Measurement Instrument Firmware
Bench instruments such as multimeters, power supplies, and signal generators built on 16-bit parallel buses use parallel NOR Flash for main firmware and calibration constants. The M29F400FT55M3E2's 55 ns access time supports zero-wait-state fetch at common 16 MHz-class bus frequencies, and its 5 V interface matches instrument backplane logic. Calibration data benefits from the fine-grained block erase structure, allowing parameter blocks to be rewritten independently of application code. The industrial -40 C to +125 C range covers instruments transported in vehicles or used near thermal sources. During calibration writes, the embedded program/erase controller handles byte programming autonomously; the host polls status via the toggle bit. Ensure the address bus is buffered if the memory sits on a shared backplane, since 44-SO parallel Flash input capacitance loads backplane lines significantly.
Recommended
Security and Surveillance Controller Firmware
Security cameras, access control panels, and alarm controllers deployed in industrial settings use robust nonvolatile code storage; the M29F400FT55M3E2 provides this with 4 Mbit density, a 5 V supply for legacy controller boards, and hardware-protected boot blocks that resist tampering or corruption of the bootloader region. Its 55 ns random access allows the security processor to execute authentication and logging code directly from Flash during power-on, before any RAM setup, which shortens time-to-armed state after power restoration - a critical metric for surveillance uptime. The wide -40 C to +125 C temperature range suits outdoor NEMA enclosures. Design trade-off: parallel NOR consumes about 44 board signals versus roughly 4 for SPI NOR, so choose this device where an existing parallel bus exists and the 44-SO footprint is already routed.
Recommended
Recommended Products Summary
Engineering reference data for M29F400FT55M3E2 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | M29F400FT55M3F2 | M29F400FB55M3E2 | M29F400FT55M32 | M29F400FB5AM62 |
|---|---|---|---|---|---|
| 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 |
| Density | 4 Mbit | 4 Mbit | 4 Mbit | 4 Mbit | 4 Mbit |
| Access Time | 55 ns | 55 ns | 55 ns | 55 ns | [DATA_NEEDED] |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Organization | 512K x 8 / 256K x 16 | 512K x 8 / 256K x 16 | 512K x 8 / 256K x 16 | 512K x 8 / 256K x 16 | 512K x 8 / 256K x 16 |
| Boot Block Position | Top | Top | Bottom | Top | Bottom |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | [DATA_NEEDED] |
| Unit Price (qty 1, as of 2026-09-02) | $2.84 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- 5 V single-supply operation for legacy bus platforms (vs M29W400FB55N3F)
- Top boot block protects reset vectors (vs M29F400FB55M3E2)
- 55 ns access enables zero-wait-state XIP (vs M29F400FB5AM62)
Design Notes
The 44-SO parallel interface presents roughly 20 address lines plus a 16-bit data bus to the PCB. Keep address/data trace length skew within the processor's timing budget for the 55 ns access time; at typical 5 V embedded bus speeds this is not critical, but on backplane-shared buses add series resistors (22-33 ohm) on data lines to damp reflections. Provide 0.1 uF ceramic decoupling at each VCC pin pair plus 10 uF bulk, since block-erase current pulses can exceed steady-state read current significantly.
The most frequent integration error is confusing top boot block (T, this part) with bottom boot block (B) variants. The two are pin-compatible but place the protected boot blocks at opposite ends of the address map; swapping them silently relocates the protected region and can brick the bootloader. Always confirm the FB vs FT designator against the system memory map before BOM substitution. Also confirm the byte/word organization pin (BYTE) is properly tied, as floating it yields unpredictable data width.
This is a 5 V-only device: VCC must be a clean 5 V rail within datasheet tolerance during program and erase operations. If the board derives 5 V from a switching converter, add an LC filter or LDO stage to keep ripple below the level that could corrupt program/erase timing. Do not attempt to program the device from a marginal 5 V rail under low-battery or brown-out conditions - the embedded program/erase controller assumes a stable supply.
Estimated: for a 5 V CMOS bus driving a 44-SO Flash plus trace capacitance of roughly 30 pF per line, rise times on address lines are usually adequate at standard embedded clock rates. However, unused address inputs should not be left floating on long PCB runs; tie them to ground through the datasheet-recommended connection so the block map is deterministic. This estimate assumes 5 V drive, 30 pF line loading, and standard 70-100 ohm trace impedance; verify with your own IBIS or bench measurement for high-speed buses.
Compliance Information
RoHS compliance and lead-free status as listed by DigiKey and LCSC distributor pages. AEC-Q100 qualification status not stated in verified data - confirm with Micron for automotive use.
