M29W400FB55N3F - 4Mbit 55ns Parallel NOR Flash | Micron
MPN: M29W400FB55N3F β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.16 | $316.00 |
| 500 | $2.84 | $1,420.00 |
| 1,000 | $2.55 | $2,550.00 |
Drop-in alternatives for M29W400FB55N3F 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:
M29W400GB55N3F
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
M29W400FB70N3F
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
M29W400FB55N3T
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
M29W400FB55N3F Maximum Ratings & Electrical Characteristics
| Memory Type | NOR Flash |
| Memory Size | 4 Mbit |
| Organization | 512K x8 / 256K x16 |
| Interface | Parallel (asynchronous) |
| Access Time | 55 ns |
| Supply Voltage (VCC) | 2.7 V to 3.6 V |
| Program/Erase Supply | Single 2.7 V to 3.6 V |
| Byte/Word Select | BYTE# pin |
| Block Architecture | Boot block with hardware sector protection |
| Program Suspend/Erase Suspend | Supported |
| Package | 48-pin TSOP I (12 x 20 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Lead-Free / RoHS | Yes (F suffix = lead-free RoHS-compliant) |
M29W400FB55N3F Pin Configuration
| Pin 1 | A15 β Address input |
| Pin 2 | A16 β Address input |
| Pin 3 | NC β Not connected |
| Pin 4 | RP#/RESET β Reset/Deep power-down control; low resets device to read array mode |
| Pin 5 | NC β Not connected |
| Pin 6 | A17 β Address input |
| Pin 7 | G β Connect to VSS ground per datasheet package requirements |
| Pin 8 | A7 β Address input |
| Pin 9 | A6 β Address input |
| Pin 10 | A5 β Address input |
| Pin 11 | A4 β Address input |
| Pin 12 | A3 β Address input |
| Pin 13 | A2 β Address input |
| Pin 14 | A1 β Address input |
| Pin 15 | A0 β Address input |
| Pin 16 | CE# β Chip enable (active low) |
| Pin 17 | VSS β Ground |
| Pin 18 | OE# β Output enable (active low) |
| Pin 19 | DQ0 β Data input/output bit 0 |
| Pin 20 | DQ8 β Data input/output bit 8 |
| Pin 21 | DQ1 β Data input/output bit 1 |
| Pin 22 | DQ9 β Data input/output bit 9 |
| Pin 23 | DQ2 β Data input/output bit 2 |
| Pin 24 | DQ10 β Data input/output bit 10 |
| Pin 25 | DQ3 β Data input/output bit 3 |
| Pin 26 | DQ11 β Data input/output bit 11 |
| Pin 27 | DQ4 β Data input/output bit 4 |
| Pin 28 | DQ12 β Data input/output bit 12 |
| Pin 29 | DQ5 β Data input/output bit 5 |
| Pin 30 | DQ13 β Data input/output bit 13 |
| Pin 31 | DQ6 β Data input/output bit 6 |
| Pin 32 | DQ14 β Data input/output bit 14 |
| Pin 33 | DQ7 β Data input/output bit 7 |
| Pin 34 | DQ15/A-1 β Data bit 15 in word mode; address A-1 in byte mode |
| Pin 35 | VSS β Ground |
| Pin 36 | BYTE# β Byte/word organization select (low = x8, high = x16) |
| Pin 37 | NC β Not connected |
| Pin 38 | A14 β Address input |
| Pin 39 | A13 β Address input |
| Pin 40 | A12 β Address input |
| Pin 41 | A11 β Address input |
| Pin 42 | A10 β Address input |
| Pin 43 | A9 β Address input |
| Pin 44 | A8 β Address input |
| Pin 45 | NC β Not connected |
| Pin 46 | WE# β Write enable (active low) |
| Pin 47 | WP# β Write protect (blocks hardware protection when low) |
| Pin 48 | VCC β Power supply, 2.7 V to 3.6 V |
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
M29W400FB55N3F is suitable for 6 applications: Boot Code / Firmware Storage, Set-Top Box and Consumer Electronics, Industrial Controllers and PLCs, Networking and Telecom Line Cards, Automotive Body and Comfort Modules, Test and Measurement Instruments.
Boot Code / Firmware Storage
The M29W400FB55N3F is memory-mapped on the processor bus with a 55 ns access time, so a CPU can execute boot code directly from the Flash (XIP) without copying to RAM, cutting reset-to-code latency to a few CPU cycles. The boot-block layout places a small protected block at the bottom of the array for reset vectors, while larger blocks store the application image. Hardware sector protection prevents accidental corruption of the boot code, and RP#/RESET gives the board supervisor a hard reset path to the array. Its single 2.7-3.6 V supply integrates cleanly with standard 3.3 V digital rails.
Recommended
Set-Top Box and Consumer Electronics
Set-top box and digital TV platforms store the firmware image, channel tables, and bootloader in a small parallel NOR device. The M29W400FB55N3F's 4 Mbit capacity matches the footprint of the M29W400 family used across many MPEG-decoder reference designs, and the 55 ns read supports zero-wait-state fetch on common 16-bit host buses. Program/erase suspend lets the CPU keep reading parameters while a background field update erases another block, avoiding visible interruption of service. The 48-TSOP I package and lead-free finish fit standard consumer assembly processes.
Recommended
Industrial Controllers and PLCs
Industrial controllers require nonvolatile code storage that survives power interruptions and supports in-field firmware updates. The M29W400FB55N3F's boot-block protection guards the bootloader during update failures, while its JEDEC-style command interface is supported by most embedded Flash drivers. The 2.7-3.6 V single-supply operation tolerates the supply droop typical of factory floors, and the 55 ns access time keeps instruction fetch efficient from 16-bit microcontroller buses. Program suspend allows logging configuration parameters to one block while firmware is updated in another, minimizing downtime.
Recommended
Networking and Telecom Line Cards
Line cards, routers, and telecom backplanes traditionally boot from parallel NOR because the boot ROM must respond immediately at reset before OS drivers load. The M29W400FB55N3F provides memory-mapped, 55 ns random access across a 16-bit bus and a protected boot block for the monitor code. Byte-mode (x8) operation lets a single footprint serve both 8- and 16-bit management buses across product variants. Program and erase suspend keeps diagnostics and packet tables readable while maintenance updates run in the background, important for equipment with 99.999% availability targets.
Recommended
Automotive Body and Comfort Modules
Body control modules, window lifts, and comfort ECUs store calibration data and boot code in parallel NOR. The M29W400FB family's hardware sector protection secures calibration blocks against accidental erase, and its 3 V operation matches automotive 5 V-to-3.3 V derived rails. The 48-TSOP I surface-mount package withstands automotive reflow profiles, and the lead-free 'F' suffix supports end-of-life vehicle directives. Designers must verify the ordering suffix temperature grade against the module ambient, and should consider the pin-compatible M29W400GB successor or Micron's automotive-qualified MT25QL series for new platforms.
Recommended
Test and Measurement Instruments
Bench instruments such as multimeters, logic analyzers, and signal generators boot from parallel NOR and store user calibrations alongside firmware. The M29W400FB55N3F's 55 ns access time supports direct execution from the boot monitor, and suspend features let the instrument remain responsive while stored settings are rewritten. Hardware block protection prevents an operator-triggered reset from corrupting factory calibration, and the common command set is supported by all major embedded toolchains. The widely cloned M29W400 footprint also simplifies second-sourcing in long-life instrument platforms.
Recommended
Recommended Products Summary
Engineering reference data for M29W400FB55N3F β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | M29W400GB55N3F | M29W400FB70N3F | M29W400FB55N3T |
|---|---|---|---|---|
| Package | 48-TSOP I | 48-TSOP I - same | 48-TSOP I - same | 48-TSOP I - same |
| Brand | Micron Technology | Micron Technology | Micron Technology | Micron Technology |
| Density | 4 Mbit | 4 Mbit | 4 Mbit | 4 Mbit |
| Access Time | 55 ns | 55 ns | 70 ns | 55 ns |
| Organization | 512K x8 / 256K x16 | 512K x8 / 256K x16 | 512K x8 / 256K x16 | 512K x8 / 256K x16 |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| Supply/Packaging | Tape & Reel (TR) | [DATA_NEEDED] | [DATA_NEEDED] | Tray |
| Block Architecture | Boot block (bottom boot) | Boot block (verify map) | Boot block (bottom boot) | Boot block (bottom boot) |
Key Differentiators
- Fastest grade in the M29W400FB family (vs M29W400FB70N3F)
- Tape-and-reel supply for automated assembly (vs M29W400FB55N3T)
- Long-term supply continuity within Micron (vs M29W400GB55N3F)
Design Notes
Decouple VCC with at least 0.1 uF ceramic placed within 5 mm of pin 48, plus a 4.7-10 uF bulk capacitor per device. Program and erase operations draw transient current spikes on the 2.7-3.6 V rail; a soft rail can corrupt programming, so verify rail droop during worst-case erase with an oscilloscope. Do not power the device from a rail that dips below 2.7 V during erase - the datasheet forbids VCC interruptions during program/erase, so add a supervisor on RP#/RESET to hold the device in reset until the rail stabilizes.
At 55 ns access time, treat address and data lines as moderately fast edges on a parallel bus: keep trace lengths matched within a few centimeters and add series termination (22-33 ohm) on data lines if stubs exceed about 10 cm. Ensure CE#, OE#, and WE# timing margins are calculated with the CPU's output-valid times against the 55 ns tAVQV and the data setup/hold requirements of the host. For 8-bit (BYTE# low) mode, remember DQ15/A-1 switches function to an address input - route it on the address bus, not the data bus, or byte mode will fail.
Three frequent mistakes with M29W400FB designs: (1) leaving BYTE# floating, causing random x8/x16 mode flips - always strap it; (2) omitting the WP# strapping decision - WP# low enables hardware block protection and will silently block programming; define it per your protection scheme; (3) ignoring RP#/RESET power-up sequencing - the CPU must not fetch code until RP# is high and the device has returned to read-array mode. Finally, when substituting M29W400GB for FB, re-validate the block map and program command sequences in firmware, as die generations can differ in status-polling details.
Compliance Information
The 'F' suffix in M29W400FB55N3F denotes the lead-free, RoHS-compliant version per Micron ordering nomenclature. REACH, halogen-free, and conflict-minerals status should be confirmed from Micron's official product page and packaging declarations.
