M29F400FT55N3F2 - 4Mbit 5V Parallel NOR Flash 55ns | Micron
部品番号: M29F400FT55N3F2 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 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 |
M29F400FT55N3F2 概要
Parallel NOR Flash is a nonvolatile memory technology in which the memory array is addressed over a parallel address bus and read over a parallel data bus, allowing random byte or word access with deterministic, low-latency timing. In the memory hierarchy it sits alongside masked ROM and EEPROM as a code-storage device, and it is the classic choice for storing boot code and firmware because the CPU can execute code directly from it (XIP, execute-in-place) without any controller overhead.
Key features of this device include the fast 55 ns access time suitable for zero-wait-state or short-wait-state microprocessor buses, block-protected top boot architecture that reserves the highest addresses for boot code with individual block protection, and in-system programmability using the standard supply voltage without a separate 12 V programming supply. The device supports byte or word (x8/x16) organization selection via a configuration pin, giving designers bus-width flexibility.
Technically, the M29F400 family uses a floating-gate NOR cell array with charge-pump based program and erase circuits on chip, delivering standard NOR command-set operation. The Auto Grade 3 (125 degrees C) speed/temperature option referenced by the ordering-code structure supports elevated-temperature industrial environments per the Micron ordering information.
Typical applications include boot and firmware storage for industrial controls, telecommunications line cards, set-top boxes, and legacy embedded systems using 5 V microprocessor buses where 3 V memory is unsuitable.
When designing with this device, note that the 44-SO package requires careful bus routing to meet the 55 ns access timing budget; keep address lines matched and minimize stub lengths. Block protection must be planned early because protected blocks cannot be reprogrammed without following the documented unprotection sequence.
This page synthesizes distributor pricing from LCSC, DigiKey, Mouser and Octopart, drop-in alternatives within the same 44-SO footprint, and practical design notes not found in the manufacturer datasheet.
ドロップイン代替品: M29F400FT55N3F2 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: M29F400FT55N3F2 （同一形状・フットプリント） — 相違点: Organization, Density, Memory Type, Package, Packaging.
クイック比較ツール — 並列比較する代替部品を選択:
M29F400FB55N3F2
✅ ドロップイン✓ 在庫あり
$2.95 / 個
データシートを見る →M29F400FT55N3E2
✅ ドロップイン✓ 在庫あり
$4.15 / 個
データシートを見る →M29F200FT55N3F2
✅ ドロップイン✓ 在庫あり
価格はお問い合わせください
データシートを見る →M29F160FT55N3F2
✅ ドロップイン✓ 在庫あり
$4.9 / 個
データシートを見る →M29F400FB55M3F2
✅ ドロップイン✓ 在庫あり
$1.72 / 個
データシートを見る →M29F400FT55N3F2 仕様
| メモリタイプ | NOR Flash (SLC) |
| メモリサイズ | 4 Mbit |
| メモリ構成 | 256K x 16 |
| インターフェース | Parallel |
| Access Time | 55 ns |
| 電源電圧 | 5 V |
| Block Architecture | Top boot block |
| パッケージ | 44-SO (SOP-44) |
| 実装タイプ | 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) ピン配置ガイド
M29F400FT55N3F2 (44-so (sop-44) パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: M29F400FT55N3F2.
詳細は データシート をご参照ください。
主な用途
M29F400FT55N3F2 の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: M29F400FT55N3F2 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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) |
主な差別化要因
- 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)
設計ノート
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.
コンプライアンス情報
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.
