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AM29F400BB-55EF
AM29F400BB-55EF
| Part Number | AM29F400BB-55EF |
|---|---|
| Manufacturer | AMD / Spansion (Cypress Semiconductor / Infineon) |
| Category | Integrated Circuits (ICs) > Memory – NOR Flash |
| Description | 4 Megabit (512K x 8‑Bit / 256K x 16‑Bit) CMOS 5.0 Volt‑Only Boot Sector Flash Memory, 55ns Access Time, Bottom‑Boot Architecture, TSOP‑48 Package. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The AM29F400BB‑55EF is a 4‑Mbit 5.0V‑only NOR Flash, organized as 512K×8‑Bit / 256K×16‑Bit. It operates with single 5.0V VCC, no external Vpp required. With 55 ns access time and Bottom‑Boot sector architecture, it supports sector‑wise erase, embedded program/erase logic and hardware sector protection. Housed in TSOP‑48, it is widely adopted for firmware storage in automotive, industrial and embedded systems.
Core Advantages
Single 5.0 Volt Power Supply Operation
All read, program and erase use single 5.0V VCC. Internal high‑voltage generation removes external Vpp supply, simplifying PCB power design.
Flexible 8‑Bit / 16‑Bit Bus Interface
BYTE# pin switches bus width, supporting both 8‑bit and 16‑bit host processors for broad MCU/CPU compatibility.
Bottom‑Boot Sector Architecture
Small boot sectors locate at low addresses. Independent sector erase enables partial firmware updates without full‑chip rewrite.
Embedded Algorithms & Hardware Protection
On‑chip state‑machine handles program/erase operations. Status signals simplify host firmware; hardware sector lock safeguards critical boot code.
Key Specifications
| Brand | AMD / Spansion |
|---|---|
| RoHS Status | RoHS Compliant / Lead‑Free Option |
| EDA / CAD | PCB Footprint & 3D Model Available upon Request |
| Warranty | 1‑Year Standard Quality Warranty |
| Package / Case | TSOP‑48 (12mm x 20mm) |
| Mounting Type | Surface Mount Device (SMD/SMT) |
| Surface Marking / Silkscreen | AM29F400BB‑55EF Marking |
| Memory Size / Type | 4 Mbit NOR Flash Memory |
| Memory Organization | 512K x 8‑Bit / 256K x 16‑Bit (Selectable via BYTE# pin) |
| Access Time | 55 ns |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V (5.0V Nominal) |
| Operating Temperature | -40°C to +85°C / Extended Industrial Grade |
| Endurance / Retention | 1,000,000 Program/Erase Cycles Minimum / 20 Years Retention @125°C |
| Sector Architecture | Bottom‑Boot: 1×8K + 2×4K + 1×16K + 7×32K sectors |
| Command Set | JEDEC Standard Command Set |
| Status Monitoring | Data# Polling, Toggle Bit, RY/BY# Ready/Busy Pin |
| Special Features | Erase Suspend / Erase Resume, Hardware Sector Protection, Hardware Reset |
Typical Applications
- Automotive Engine Control Units (ECUs) and Powertrain Modules
- Industrial Control Systems, PLCs, and Embedded Single Board Computers (SBCs)
- Telecommunication Switching Gear, Routers, and Network Infrastructure
- Legacy Medical Diagnostics Equipment and Test Instruments
- Firmware and Boot Code Storage in Commercial Electronics
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Shipping Time | Shipped within 1‑2 business days |
| Delivery Time | 3‑7 working days worldwide |
| Shipping Methods | DHL, UPS, FedEx, EMS |
| Payment Methods | T/T (Bank Transfer), PayPal, Credit Card, Western Union |
Technical Support
For datasheet, sample requests, stock check, or bulk pricing, please use the Quick Inquiry form. We will reply within 24 hours.
Frequently Asked Questions
Q1: What does the “BB” designation mean in AM29F400BB‑55EF?
A: “BB” stands for Bottom‑Boot architecture. Small boot sectors are located at lower memory addresses. The “BT” suffix is Top‑Boot, with boot sectors at higher addresses. BB & BT cannot be swapped without firmware modification.
Q2: Can AM29F400BB‑55EF work in 8‑bit mode?
A: Yes. The BYTE# pin selects bus width: low = 512K×8‑Bit; high = 256K×16‑Bit.
Q3: Does this chip need external high‑voltage Vpp for programming?
A: No. All read, program & erase use single 5.0V VCC. High‑voltage is generated internally.
Q4: What do suffixes‑55,‑EF,‑EE,‑EI stand for?
A:
‑55: 55 ns access time;‑45=45 ns,‑70=70 ns.
‑EF: Industrial‑40~+85°C, TSOP‑48.
‑EE: Extended industrial‑40~+125°C, TSOP‑48.
‑EI: Commercial 0~+70°C, TSOP‑48.
Temperature variants are not pin‑compatible for harsh‑environment designs.
Q5: What are compatible & alternative replacements for AM29F400BB‑55EF?
A: Direct pin‑to‑pin: AM29F400BB‑55EE, AM29F400BB‑70EF.
Note: AM29F400BT‑55EF is Top‑Boot variant; sector map differs, firmware must be adjusted.
Cross‑brand alternatives: SST39LF400, M29F400BB. Verify sector layout & timing before substitution.
Q6: Difference between TSOP‑48 and SO‑44 packages?
A: AM29F400BB‑55EF uses TSOP‑48 (12 mm × 20 mm, 48‑pin). SO‑44 is a 44‑pin shrink package with different pinout. They are not pin‑compatible, cannot be swapped on existing PCB.
Q7: Can AM29F400BB‑55EF run on 3.3V power supply?
A: No. This is a 5V‑only NOR Flash. VCC must be 4.5‑5.5V. It does not support 3.3V operation.
Q8: What is the sector layout of AM29F400BB‑55EF?
A: Bottom‑Boot sector map: 1×8K + 2×4K + 1×16K +7×32K sectors. Each sector can be erased independently.
Q9: How to get datasheet, footprint or volume pricing?
A: Datasheets, PCB footprint files, stock check and bulk pricing can be requested via our Quick Inquiry form.
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