M29W400FB55N3E - 4Mb NOR Flash 55ns TSOP-48 | Micron Technology
N.º de pieza: M29W400FB55N3E ✓ Activo| Cant. | Precio unitario | Total |
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M29W400FB55N3E Descripción general
Parallel NOR Flash is a non-volatile memory technology in which every cell connects directly to address lines, allowing random access to any byte with deterministic read latency. This distinguishes NOR from NAND Flash: NOR offers fast random reads and execute-in-place (XIP) capability, which is why NOR devices sit in the memory hierarchy between mask ROM and RAM as the standard medium for boot firmware, BIOS images, and configuration data in microcontroller-based systems.
Key features of the M29W400FB55N3E include the 55 ns access time (a 70 ns speed grade also exists in the family), a wide 2.7 V to 3.6 V operating supply, and an asymmetric block architecture of 19 memory blocks with one hardware-protectable boot block. The FB suffix denotes a bottom boot block arrangement, and the BYTE# pin selects 8-bit or 16-bit bus width. Typical programming time is 10 microseconds per byte/word, supporting efficient in-system firmware updates.
Technically, the device uses a single low-voltage supply with internally generated high voltage for program and erase, command-set style bus operations, and status polling via data bits during write cycles. The 19-block granularity enables partial firmware regions, parameter storage, and code/data partitioning without erasing the entire array. The automotive-qualified temperature range of -40C to +125C supports harsh environments.
Typical applications include boot-code storage for industrial controllers, telecom line cards, set-top boxes, automotive body and powertrain modules, and embedded systems requiring reliable XIP code execution from a 3.3 V parallel memory bus.
When designing with this device, verify bus width selection via BYTE# early in the layout, since it determines which address and data lines are used, and reserve GPIO or CPLD control for the RP# (reset/power-down) pin to guarantee a defined state during power sequencing.
This page synthesizes verified distributor data, drop-in alternatives from the same Micron/ST legacy family, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para M29W400FB55N3E — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con M29W400FB55N3E (mismo factor de forma y huella) — difiere en Package, Density, Organization, Interface, Memory Type.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
M29W400FB55N3F
✅ Sustitución directa✓ En stock
$2.55 / unidad
Ver hoja de datos →M29F400FT55N3E2
✅ Sustitución directa✓ En stock
$4.15 / unidad
Ver hoja de datos →SST39VF402C-70-4I-EKE
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
M29W320DB70N3E
✅ Sustitución directa✓ En stock
$1.95 / unidad
Ver hoja de datos →M29W400FB55N3E Especificaciones
| Tipo de memoria | NOR Flash (parallel) |
| Density | 4 Mbit (4194 kbits) |
| Organización de memoria | 512K x 8 bit / 256K x 16 bit |
| Access Time | 55 ns |
| Supply Voltage (VCC) | 2.7 V to 3.6 V |
| Interfaz | Parallel, 8-bit/16-bit (BYTE# selectable) |
| Block Architecture | 19 memory blocks, 1 boot block (bottom, FB) |
| Programming Time | 10 us per byte/word typical |
| Boot Block Hardware Protection | Yes |
| Temperatura de funcionamiento | -40C to +125C |
| Encapsulado | 48-TSOP I, 12 x 20 mm |
| Pins | 48 |
| Tipo de montaje | Surface Mount |
| Packaging | Tray |
| Estado RoHS | Compliant |
| Speed Grades in Family | 55 ns, 70 ns |
Guía de configuración de pines de M29W400FB55N3E 48-tsop i, 12 x 20 mm
Configuración de pines para M29W400FB55N3E (encapsulado 48-tsop i, 12 x 20 mm). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para M29W400FB55N3E.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
M29W400FB55N3E es adecuado para 6 aplicacións: Embedded Boot Code Storage, Industrial PLC and Controller Firmware, Automotive Body and Powertrain Modules, Telecom Line Cards and Network Equipment, Set-Top Box and Consumer Electronics Boot ROM, Test and Measurement Instrument Firmware.
Embedded Boot Code Storage
The M29W400FB55N3E is a natural fit for boot-code storage because parallel NOR provides deterministic random access with a 55 ns access time, enabling execute-in-place firmware without copying code to RAM. The hardware-protectable bottom boot block safeguards the reset vector and first-stage bootloader from accidental erasure during field updates, while the remaining 18 blocks hold the main application image. On a 3.3 V microcontroller parallel bus, the device connects directly to a 2.7 V to 3.6 V VCC rail, and the BYTE# pin lets the same board support either an 8-bit 512K x 8 or a 16-bit 256K x 16 memory map. Designers should drive RP# from a supervised reset so the Flash never floats during brown-out.
Recomendado
Industrial PLC and Controller Firmware
Programmable logic controllers and industrial control cards require firmware that survives power loss and field reprogramming over decades of service. The M29W400FB55N3E provides 4 Mbit of non-volatile storage with a -40C to +125C operating range that covers cabinet, motor-control, and outdoor installations. Its 19-block architecture lets engineers partition bootloader, application, and parameter storage into independent erase regions, so logging or calibration data can be updated without touching code blocks. The 10 us per byte/word typical programming time allows a full image update in well under a second over a service UART or fieldbus. Because the part is mature and widely second-sourced across distributors, long-term spare stocking is straightforward for industrial maintenance programs.
Recomendado
Automotive Body and Powertrain Modules
Body control modules, instrument clusters, and powertrain auxiliaries use parallel NOR for code storage because it tolerates the harsh thermal and voltage environments typical of 12 V automotive systems with load-dump transients. The M29W400FB55N3E operates from -40C to +125C, matching under-hood and near-engine placement requirements, and its 2.7 V to 3.6 V supply connects directly to conditioned 3.3 V rails derived from automotive regulators. The boot block protection ensures that ECU boot firmware remains intact through mis-flashed updates or brown-out events during cranking. The FB bottom boot block convention matches legacy automotive memory maps, simplifying migration from earlier ST M29F designs without redrawing the code base.
Recomendado
Telecom Line Cards and Network Equipment
Telecom line cards, WAN interface boards, and legacy network equipment have historically used 3 V parallel NOR for boot ROM and configuration storage, and the M29W400FB55N3E matches that convention exactly. Its 55 ns access time supports zero-wait-state or short-wait-state CPU boot from the parallel bus, keeping power-on self-test time short, while the 16-bit mode doubles effective bus throughput for code fetches compared to 8-bit wiring. The 19-block map allows the network-management parameter sector to be erased independently of the protocol firmware image. Because these platforms require long service life, the mature availability of this part across 14 distributor channels reported by Octopart makes it a practical sparing choice for maintenance fleets.
Recomendado
Set-Top Box and Consumer Electronics Boot ROM
Set-top boxes, DVD players, and other consumer platforms frequently reserve a small parallel NOR device for the immutable boot loader while holding the main firmware in NAND or serial Flash. The M29W400FB55N3E suits this role with its low 4 Mbit cost point, 3.3 V single-supply operation, and protected boot block that guarantees the platform always reaches a recovery path. The BYTE# pin allows the same PCB to be populated for either 8-bit or 16-bit boot buses, reducing board variants across product families. Its RoHS-compliant TSOP-48 package with standard 1.27 mm pitch keeps assembly compatible with mainstream SMT lines. Consumer manufacturers typically stock the 70 ns grade for cost, reserving the 55 ns device for faster boot requirements.
Recomendado
Test and Measurement Instrument Firmware
Bench instruments, data loggers, and modular test hardware need reliable non-volatile code storage with fast random reads to keep instrument startup latency low. The M29W400FB55N3E provides 4 Mbit of NOR with a 55 ns access time, directly addressable from the instrument microprocessor bus without serial protocol overhead. The 19-block sector map supports storing factory calibration constants in dedicated blocks that field firmware updates never erase, preserving traceability and accuracy data across service cycles. The -40C to +125C range and RoHS-compliant TSOP-48 package suit both laboratory and portable field instruments. Designers typically pair the device with a supervisor that holds RP# asserted until VCC is stable, ensuring the memory map is never misread during power ramp.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para M29W400FB55N3E — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | M29W400FB55N3F | M29F400FT55N3E2 | SST39VF402C-70-4I-EKE | M29W320DB70N3E |
|---|---|---|---|---|---|
| Brand | Micron Technology | Micron Technology | Micron Technology | Microchip Technology | Micron Technology |
| Package | 48-TSOP I (12 x 20 mm) | 48-TSOP I - same | 48-TSOP I - same | 48-TSOP I - same | 48-TSOP I - same |
| Density | 4 Mbit | 4 Mbit | 4 Mbit | 4 Mbit | 32 Mbit |
| Access Time | 55 ns | 55 ns | 55 ns | 70 ns | 70 ns |
| 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 | 2.7 V to 3.6 V |
| Organization | 512K x 8 / 256K x 16 | 512K x 8 / 256K x 16 | 512K x 8 / 256K x 16 | 256K x 16 / 512K x 8 | 4M x 8 / 2M x 16 |
| Block Architecture | 19 blocks, bottom boot block | 19 blocks, bottom boot block | Asymmetric blocks, top boot block | Uniform sectors (SST architecture) | Bottom boot block, larger sector map |
Diferenciadores clave
- Fastest access time in its drop-in class (frente a SST39VF402C-70-4I-EKE)
- Hardware-protectable boot block for safe field updates (frente a SST39VF402C-70-4I-EKE)
- Direct firmware compatibility with legacy M29W fleet (frente a M29F400FT55N3E2)
Notas de diseño
On 3.3 V parallel buses longer than about 10 cm or with multiple memory loads, add 22-33 ohm series termination resistors on address and data lines close to the driver to control ringing; at 55 ns access timing even 2-3 ns of overshoot-induced settle time erodes margin. Verify that the host bus interface timing budget accounts for the full 55 ns access plus output enable and data setup times, not just the address-to-data figure, especially in 8-bit BYTE# mode where cycle counts double for the same image size.
The RP# (reset/power-down) pin must never be left floating: if RP# is low during read attempts the device outputs invalid data, and a floating pin during power ramp can cause spurious block protection states. Tie RP# to the system supervisor reset through a 10 kohm pull-up. Similarly, BYTE# must be driven (or strapped) to a defined level at all times - it selects the 8-bit versus 16-bit bus mode, and an undriven BYTE# yields an undefined data width during boot.
Decouple VCC with 100 nF ceramic directly at the package plus a 4.7 uF bulk capacitor per device. Program and erase operations draw transient current pulses as the internal charge pump generates high voltage; insufficient bulk capacitance on a shared rail can inject supply droop into neighboring analog circuitry. Estimated: a full 4 Mbit erase plus reprogram at 10 us/byte takes roughly 5.2 seconds of pump activity per update cycle, so rail droop during in-system updates is a real, repeatable event worth measuring on the bench.
The 48-TSOP I (12 x 20 mm) footprint uses a 1.27 mm lead pitch; keep address lines length-matched within about 15 mm to each other to minimize skew in 16-bit mode, and route BYTE# and RP# as short, quiet traces away from switching clock nets. Because this part is commonly second-sourced against the SST39VF402C in the same footprint, leave the socket area clear of tall neighbors so either supplier's marking or a rework nozzle can access the package.
Información de cumplimiento
RoHS compliance and lead-free finish indicated by distributor specification listings and the E suffix in the ordering code. REACH, halogen-free, and conflict minerals status not stated in provided data - verify on the Micron product page.
