My Inquiry
My Account
Microchip Technology AT49F001A-45JI
- Part No.:
- AT49F001A-45JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001A-45JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,350
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49F001A-45JI from Atmel is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 45 ns read access time, 3-second chip erase cycle, byte-by-byte programming at 30 µs/byte, and hardware data protection including VCC sense and noise filtering. It serves as nonvolatile program/data storage in embedded microcontroller systems requiring field-upgradable firmware.
For engineers reviewing the AT49F001A-45JI datasheet, AT49F001A-45JI pinout, AT49F001A-45JI application, or AT49F001A-45JI equivalent, key selection considerations include industrial temperature range (-40°C to +85°C), PLCC-32 package compatibility, boot block lockout functionality, and 5V-only command interface without high-voltage programming.
Technical Context
The AT49F001A-45JI implements a sector-architected Flash array with one 16K-byte boot block (address 00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (32K + 64K bytes). Its internal control logic executes standardized command sequences-including chip erase (6-cycle 555/AAA/555/80/555/AA/555/10), sector erase, and byte programming-without external clocks or timing signals.
It supports EPROM-like read operation via CE/OE/WE control, DATA polling (I/O7 complement detection), and Toggle Bit (I/O6 toggling) for end-of-operation detection. The RESET pin enables system-level reset and, when driven to 12V, overrides boot block lockout-though this feature is disabled on AN/T variants and not applicable to AT49F001A-45JI per its J-suffix PLCC package designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits); sufficient for bootloader + configuration storage in 8-bit microcontroller systems |
| Read Access Time | 45 ns max; enables direct execution from Flash in timing-critical embedded applications |
| Chip Erase Time | 3 seconds typical; allows rapid firmware updates during production or field service |
| Byte Programming Time | 30 µs typical; supports fine-grained patching without full-block rewrites |
| Operating Voltage | 5.0 V ±10%; eliminates need for dedicated programming voltage rails or charge pumps |
| Active Current | 20 mA typical at 5 MHz; compatible with standard 5V power budgets in industrial controllers |
| Standby Current | 50 µA CMOS; enables low-power retention in battery-backed or energy-sensitive systems |
| Endurance | 10,000 write/erase cycles; supports multi-year field firmware update cycles |
Pinout & Package
AT49F001A-45JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with 1.27 mm pitch and pin 1 identifier marked by corner cut and chamfer. Package dimensions: 12.32–12.57 mm × 14.86–15.11 mm × 3.18–3.56 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A11–A16 are don't-care in some command cycles |
| 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; used with CE to prevent bus contention during shared-memory access |
| WE | Write Enable | Active-low write strobe; latches addresses and data during command sequences and byte programming |
| RESET | Reset Input | Active-low system reset; 12V override enables boot block reprogramming (functional on AT49F001A-45JI) |
| I/O0–I/O7 | Data Bus | Bi-directional 8-bit data interface; I/O6 provides toggle-bit status; I/O7 provides DATA polling feedback |
| VCC | Power Supply | +5V supply input; internal VCC sense disables programming if voltage drops below 3.8V |
| GND | Ground | Reference return path for all digital and programming operations |
| NC | No Connect | Pin 1 in PLCC package is NC; no electrical connection or routing required |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (00000H–03FFFH) can be permanently write-protected via command sequence to safeguard bootloader integrity |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibition (OE low/CE high/WE high) prevent accidental writes |
| Two End-of-Operation Detection Methods | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) enable software-driven timing independence |
| 5V-Only Command Interface | Eliminates need for 12V programming supplies; all reads, erases, and writes executed using standard 5V logic levels |
| Industrial Temperature Range | Rated for -40°C to +85°C operation; validated for use in programmable logic controllers and motor drives |
Applications
| Industrial PLC Firmware Storage | Embedded System Bootloader |
|---|---|
Use Scenario: Storing ladder logic programs and I/O configuration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast 45 ns read access enabling real-time scan cycle execution and in-field firmware updates via serial interface. Use Value: Sector erase capability allows selective reprogramming of parameter blocks without disturbing boot code, reducing downtime during commissioning. |
Use Scenario: Holding secure startup code for 8-bit microcontrollers in medical diagnostic equipment requiring certified boot integrity. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; boot block lockout prevents unauthorized modification of initialization routines. Use Value: 12V RESET override enables authorized recovery of corrupted boot sectors during service, maintaining regulatory compliance. |
| Automotive Body Control Module | Point-of-Sale Terminal Configuration |
Use Scenario: Storing calibration data and CAN message lookup tables in automotive body control units operating under wide thermal and EMI stress. IC Role / Device Role / Timing Role: Parameter block storage (two 8K-byte sections) for vehicle-specific settings; accessed via microcontroller SPI-to-parallel bridge. Use Value: 10,000-cycle endurance and 50 µA standby current support long-term field reliability and low quiescent power in always-on modules. |
Use Scenario: Retaining localized language packs, tax rate tables, and peripheral driver configurations across firmware upgrades in retail POS terminals. IC Role / Device Role / Timing Role: Field-upgradable nonvolatile storage for region-specific assets; accessed during boot before OS load. Use Value: Byte-programming granularity enables incremental updates without full image reload, minimizing store downtime during software rollouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002A-45JI | 2 Mbit density (256K × 8), same 45 ns access, identical PLCC-32 package and command set | Supports larger firmware images; requires updated address decoding for A17 | Select when future firmware growth exceeds 1 Mbit or dual-bank operation is needed |
| MX29LV001CTTI-45G | 1 Mbit, 45 ns, 3.0V–3.6V core voltage; requires level-shifting for 5V systems; different command set and boot block layout | Lower power consumption but incompatible voltage domain and lockout mechanism | Choose only for new 3.3V designs where legacy 5V compatibility is not required |
Compared with AT49F001A-45JI, AT49F002A-45JI offers double capacity with full pin and command compatibility, while MX29LV001CTTI-45G demands board-level voltage translation and firmware adaptation-making the former a seamless upgrade and the latter a redesign-dependent alternative.
Availability
AT49F001A-45JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded system bootloader, automotive body control module, and point-of-sale terminal configuration requiring stable component supply across extended product lifecycles.
Supply support for AT49F001A-45JI 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
Atmel Corporation, now part of Microchip Technology, is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication devices.
The AT49F001A series belongs to Atmel's 5V Flash memory product line, designed specifically for in-system reprogrammability in industrial and automotive embedded systems requiring robust, field-upgradable nonvolatile storage.
FAQ
What is the boot block address range for AT49F001A-45JI?
The AT49F001A-45JI uses the base AT49F001A configuration with boot block located at address 00000H–03FFFH (16K bytes). This differs from the AT49F001AT variant, which places the boot block at 1C000H–1FFFFH. The boot block supports permanent lockout via command sequence to protect critical startup code.
Does AT49F001A-45JI support 12V RESET override for boot block reprogramming?
Yes, AT49F001A-45JI supports 12V ±0.5V applied to the RESET pin to temporarily disable boot block lockout, enabling chip erase, sector erase, or byte programming of protected regions. This feature is functional on the AT49F001A variant and disabled only on AN/T suffix versions.
What package type is used for AT49F001A-45JI?
AT49F001A-45JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package designated as 32J per Atmel's ordering information. It conforms to JEDEC MS-016, Variation AE, with 1.27 mm lead pitch and mechanical dimensions of 12.32–12.57 mm × 14.86–15.11 mm.
How does hardware data protection work in AT49F001A-45JI?
AT49F001A-45JI implements three hardware protections: (1) VCC sense inhibits programming if supply drops below ~3.8V; (2) Program inhibit requires OE high, CE low, and WE low simultaneously; (3) Noise filter rejects WE/CE pulses shorter than 15 ns. These prevent spurious writes during power transients or EMI events.
Can AT49F001A-45JI be used in place of AT49F001AN-45JI?
No-AT49F001A-45JI and AT49F001AN-45JI differ in RESET pin functionality: the "N" suffix denotes absence of RESET pin override capability. Pin 1 is NC on AT49F001AN-45JI, whereas AT49F001A-45JI retains full 12V RESET override. Substitution requires verification of boot block recovery requirements.
AT49F001A-45JI 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:
- 45 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)
AT49F001A-45JI FAQ
1.How can I place an order for AT49F001A-45JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001A-45JI 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 AT49F001A-45JI reliable?
The price and inventory of AT49F001A-45JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001A-45JI is usually 5 days.
3.What payment methods are accepted for AT49F001A-45JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001A-45JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001A-45JI?
AT49F001A-45JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001A-45JI 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 AT49F001A-45JI?
For technical support, including AT49F001A-45JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001A-45JI requirements.
6.How does Aetrix verify that AT49F001A-45JI is sourced from the original manufacturer or authorized distributors?
All AT49F001A-45JI 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 AT49F001A-45JI meets industry standards.
7.What is the process for return or replacement of AT49F001A-45JI?
All AT49F001A-45JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001A-45JI, 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 AT49F001A-45JI part is unused and in its original packaging.
Return procedure for AT49F001A-45JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001A-45JI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
