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Microchip Technology AT49F001NT-55JI
- Part No.:
- AT49F001NT-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001NT-55JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,570
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Product details
Overview
AT49F001NT-55JI from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 55 ns read access time, 10 µs typical byte programming, 10-second chip erase, hardware data protection, and sector-based architecture with 16K-byte boot block lockout. It is deployed in industrial firmware update modules requiring reliable field reprogramming.
For engineers reviewing the AT49F001NT-55JI datasheet, AT49F001NT-55JI pinout, AT49F001NT-55JI application, or AT49F001NT-55JI equivalent, key selection considerations include its industrial temperature range (–40°C to +85°C), PLCC-32 package compatibility, boot-block write-protection behavior, 5V-only command interface, and DATA polling/Toggle Bit end-of-operation detection.
Technical Context
The AT49F001NT-55JI implements a standard parallel Flash memory interface with CE/OE/WE control logic and supports both chip-erase and sector-erase operations via six-cycle software command sequences. Its internal program controller manages timing for byte programming (tBP = 10–50 µs) and erase cycles (tEC = 10 s), eliminating external timing components.
It features dual-mode boot-block protection: permanent lockout at ≤5.5 V after activation, with optional 12 V RESET override for reprogramming - a capability absent in the AT49F001N(T) variant. Memory organization includes one 16K-byte boot block (address 1C000H–1FFFFH), two 8K-byte parameter blocks, and two main memory blocks (32K/64K bytes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), enabling full firmware image storage for 8-bit MCUs |
| Read Access Time | 55 ns - meets real-time boot code fetch requirements in industrial controllers |
| Byte Programming Time | 10 µs typical - supports fast field updates without system downtime |
| Erase Cycle Time | 10 seconds max - enables predictable maintenance windows for firmware upgrades |
| Operating Voltage | 5 V ±10% - compatible with legacy 5V logic buses and eliminates level-shifting |
| Temperature Range | –40°C to +85°C - qualified for industrial ambient environments |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - enables software-driven operation completion without fixed delays |
Pinout & Package
AT49F001NT-55JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE. Pin 1 is marked by a corner notch; pins are numbered counterclockwise. Pin 1 (A7) is not NC - all 32 pins are functional. Pin 9 is NC in DIP/PLCC but not in TSOP; for this PLCC variant, no pins are NC per datasheet note.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing (00000H–1FFFFH) |
| I/O0–I/O7 | Data Input/Output | Bi-directional 8-bit data bus; latched on WE/CE rising edge during programming |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access |
| OE | Output Enable | Active-low output control; enables data bus drivers only when CE is also low |
| WE | Write Enable | Active-low write strobe; controls latching of addresses/data and initiates command sequences |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V input enables boot-block override |
| VCC | Power Supply | +5 V supply; internal voltage sensing disables programming if <3.8 V |
| GND | Ground | Reference return path for all signals and power; decoupling required near VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (1C000H–1FFFFH) can be permanently write-protected to preserve secure boot code |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low/CE high/WE high blocks writes) |
| 5V-Only Command Interface | No external high-voltage programming supply needed - simplifies system-level power design and eliminates HV charge pumps |
| Internal Program Timer | Automatically times byte programming and erase cycles - removes need for external timing circuitry or software delay loops |
| DATA Polling & Toggle Bit | Two independent, software-accessible methods to detect operation completion - improves firmware robustness and reduces worst-case latency |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile code storage IC providing boot code and application firmware with guaranteed read access ≤55 ns and field-upgradable sectors. Use Value: Boot block lockout prevents accidental corruption of critical startup routines while allowing parameter and application updates via sector erase - ensuring deterministic system recovery after power loss. | Use Scenario: Holding certified bootloader and diagnostic firmware in Class II medical instruments requiring regulatory-compliant firmware integrity and traceable update history. IC Role / Device Role / Timing Role: Secure, reprogrammable Flash memory IC with hardware write protection and 10,000-cycle endurance for life-critical firmware storage. Use Value: 12 V RESET override allows authorized reprogramming of protected boot code during service - satisfying FDA-required firmware validation and field correction workflows. |
| Telecom Base Station Configuration | Automotive Body Control Module (BCM) |
Use Scenario: Storing configuration profiles, calibration tables, and protocol stacks in remote radio units exposed to thermal cycling and vibration. IC Role / Device Role / Timing Role: Industrial-grade parallel Flash memory IC supporting in-system reprogramming over backplane bus without board removal. Use Value: 10-second chip erase and 10 µs/byte programming enable rapid configuration swaps during network optimization - reducing maintenance window duration. | Use Scenario: Hosting vehicle-specific calibration data and feature-enable bits in body control modules operating across automotive temperature ranges. IC Role / Device Role / Timing Role: Automotive-qualified (industrial temp) Flash memory IC with hardware data protection and sector-based update capability. Use Value: Parameter block architecture isolates calibration data (8K × 2) from main firmware - enabling safe over-the-air updates without risking calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002NT-55JI | 2 Mbit (256K × 8) density; same PLCC-32 package, pinout, and command set; identical timing and protection features | Supports larger firmware images; requires no PCB changes but may increase cost and power draw | Select when future firmware growth exceeds 1 Mbit or when dual-device consolidation is planned |
| SST39VF010-55-4C-NHE | 1 Mbit, 5V, 55 ns access; TSOP-32 package; lacks RESET-based boot-block override and has different command sequence (3-cycle vs 6-cycle) | Not pin-compatible; requires layout change; no 12 V override - limits field repair flexibility | Choose only if TSOP footprint is mandatory and boot-block reprogramming is never required post-deployment |
Compared with AT49F001NT-55JI, AT49F002NT-55JI offers double capacity with full compatibility, while SST39VF010 demands PCB redesign and forfeits the critical 12 V boot-block recovery path - making AT49F001NT-55JI optimal for industrial systems needing field-serviceable secure boot.
Availability
AT49F001NT-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code retention, and telecom base station configuration requiring stable component supply across extended lifecycle programs.
Supply support for AT49F001NT-55JI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel Flash products including the AT49F series.
The AT49F001 family was designed specifically for 5V embedded systems requiring in-system reprogrammability, hardware write protection, and deterministic erase/program timing - targeting industrial control, medical instrumentation, and communications infrastructure.
FAQ
What is the boot block address range for AT49F001NT-55JI?
The boot block for AT49F001NT-55JI occupies addresses 1C000H to 1FFFFH (16 Kbytes). This differs from the base AT49F001(N) variant, which places the boot block at 00000H–03FFFH. The AT49F001NT-55JI's relocated boot block enables flexible memory mapping in systems where lower-address space is reserved for RAM or peripherals.
Does AT49F001NT-55JI support 12 V RESET override for boot block reprogramming?
Yes, AT49F001NT-55JI supports 12 V ±0.5 V applied to the RESET pin to override enabled boot block lockout - allowing chip erase, sector erase, or byte programming of the protected region. This feature is explicitly documented for the AT49F001(N)T family and confirmed for AT49F001NT-55JI in the Boot Block Programming Lockout Override section of the datasheet.
What package type is used for AT49F001NT-55JI?
AT49F001NT-55JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package designated as 32J. It conforms to JEDEC MS-016, Variation AE, with dimensions 12.32 mm × 14.86 mm × 3.56 mm (max height), and features a corner notch for pin 1 identification.
How does hardware data protection work in AT49F001NT-55JI?
AT49F001NT-55JI implements three hardware data protection mechanisms: (1) VCC sense circuitry inhibits programming if supply drops below ~3.8 V; (2) any of OE low, CE high, or WE high disables write cycles; and (3) input noise filters reject pulses shorter than 15 ns on CE or WE. These features prevent spurious writes during power transients or EMI events.
What is the maximum number of program/erase cycles specified for AT49F001NT-55JI?
The AT49F001NT-55JI is rated for a typical 10,000 program/erase cycles per memory location. This endurance specification applies to all sectors - boot block, parameter blocks, and main memory - and is validated across the full industrial temperature range (–40°C to +85°C).
AT49F001NT-55JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F001NT-55JI FAQ
1.How can I place an order for AT49F001NT-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001NT-55JI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT49F001NT-55JI reliable?
The price and inventory of AT49F001NT-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001NT-55JI is usually 5 days.
3.What payment methods are accepted for AT49F001NT-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001NT-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001NT-55JI?
AT49F001NT-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001NT-55JI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT49F001NT-55JI?
For technical support, including AT49F001NT-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001NT-55JI requirements.
6.How does Aetrix verify that AT49F001NT-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F001NT-55JI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT49F001NT-55JI meets industry standards.
7.What is the process for return or replacement of AT49F001NT-55JI?
All AT49F001NT-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001NT-55JI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT49F001NT-55JI part is unused and in its original packaging.
Return procedure for AT49F001NT-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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