My Inquiry
My Account
Microchip Technology AT49F1025-55JI
- Part No.:
- AT49F1025-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT49F1025-55JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,041
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49F1025-55JI from Microchip Technology (formerly Atmel) is a 1-megabit (64K × 16) 5V-only parallel Flash memory IC used for nonvolatile program/data storage in embedded microcontroller boot systems. It delivers 35 ns read access time, supports word-by-word programming (10 µs/word), features an 8K-word boot block with hardware lockout, and operates across the industrial temperature range (–40°C to +85°C) in a 44-lead PLCC package.
For engineers reviewing the AT49F1025-55JI datasheet, AT49F1025-55JI pinout, AT49F1025-55JI application, or AT49F1025-55JI equivalent, key selection criteria include industrial-grade reliability, boot-sector write protection, 5V-only reprogramming compatibility, and PLCC footprint suitability for legacy board designs requiring field-upgradable firmware storage.
Technical Context
The AT49F1025-55JI implements a CMOS-based parallel Flash architecture with dual-line chip enable (CE) and output enable (OE) control for bus contention prevention. Its internal command register executes erase and program operations via six-cycle sequences (e.g., Chip Erase: 5555H/AA → 2AAAH/55 → 5555H/80 → 5555H/AA → 2AAAH/55 → 5555H/10).
It integrates hardware data protection including VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored on WE/CE), and program-inhibit logic (OE low, CE high, or WE high blocks writes). Boot block lockout is enabled via a deterministic six-command sequence targeting address 5555H/2AAAH, permanently protecting addresses 0000H–1FFFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (64K words × 16 bits); supports 16-bit data bus interface without byte-lane splitting. |
| Read Access Time | 55 ns max; enables direct connection to 18 MHz microcontrollers without wait states. |
| Operating Voltage | 5 V ±10%; eliminates need for external voltage translators in 5V system designs. |
| Temperature Range | –40°C to +85°C; qualified for industrial environments including motor drives and PLCs. |
| Endurance | 10,000 program/erase cycles; ensures long-term field firmware update viability. |
| Boot Block Size | 8K words (0000H–1FFFH); isolates secure bootloader code from main application updates. |
| Standby Current | 300 µA max (industrial grade); reduces power in sleep-mode embedded systems. |
Pinout & Package
AT49F1025-55JI uses a 44-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-018AC, with 1.27 mm lead pitch and 16.5 mm × 16.5 mm body size. Pin 1 is marked by a corner chamfer and dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word addressing; A0–A15 must be stable before CE/WE assertion. |
| I/O0–I/O15 | Bidirectional Data Bus | 16-bit parallel data path; high-impedance during standby or when CE/OE inactive. |
| CE | Chip Enable | Active-low global select; device enters standby if CE high, blocking all internal operations. |
| OE | Output Enable | Active-low read control; outputs enter high-Z state when OE high, preventing bus conflicts. |
| WE | Write Enable | Active-low programming/erase control; initiates command sequences when CE and WE both low. |
| VCC | Power Supply | +5 V supply; requires local 0.1 µF ceramic decoupling adjacent to pin 44. |
| GND | Ground | Two dedicated ground pins (pins 20 and 36); mandatory for noise immunity in high-speed reads. |
| NC | No Connect | Pins 7, 19, 27, 31, 39, 40, 42, 43 have no internal connection; must remain unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for 12V programming voltage generators, simplifying PCB power design and reducing BOM count. |
| Data Polling & Toggle Bit | Enables real-time detection of program/erase completion without polling timers or external status lines. |
| Hardware Boot Block Lockout | Permanently protects bootloader region (0000H–1FFFH) after activation, preventing accidental corruption during field updates. |
| Fast Word Programming | 10 µs typical write time per 16-bit word allows rapid incremental firmware patching in production test environments. |
| Industrial Temperature Rating | Validated operation from –40°C to +85°C ensures reliability in harsh environments like factory automation and outdoor telecom equipment. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Code |
|---|---|
|
Use Scenario: Storing firmware images and configuration data in programmable logic controllers deployed in manufacturing plants with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing 16-bit parallel access to microcontroller during cold start and field firmware upgrades. Use Value: Industrial temperature rating and 10,000-cycle endurance ensure multi-year operational integrity without recalibration or replacement. |
Use Scenario: Hosting boot code for 8051- or Z80-based medical diagnostic instruments requiring certified, tamper-resistant startup routines. IC Role / Device Role / Timing Role: Secure boot block memory with hardware lockout preventing unauthorized modification of safety-critical initialization sequences. Use Value: 8K-word protected sector (0000H–1FFFH) guarantees bootloader integrity while allowing main application updates via standard ISP commands. |
| Automotive Engine Control Unit (ECU) | Point-of-Sale Terminal Firmware |
|
Use Scenario: Storing calibration maps and diagnostic software in engine control units operating under under-hood thermal stress. IC Role / Device Role / Timing Role: High-reliability Flash memory interfaced directly to 16-bit automotive microcontrollers via parallel bus. Use Value: 55 ns read timing meets ECU real-time response requirements; VCC sense circuitry prevents spurious writes during battery voltage sag. |
Use Scenario: Holding payment processing firmware and localization data in retail terminals subject to frequent software updates and environmental cycling. IC Role / Device Role / Timing Role: Field-upgradable firmware storage with fast 10 µs word programming enabling <1-second OTA update windows. Use Value: PLCC package allows socket-based replacement in service depots; boot lockout prevents kiosk mode corruption during remote updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF100A-55-4C-NHE | 44-pin PLCC, 1 Mbit (64K × 16), 5V, 55 ns access, but lacks boot block lockout and uses different command set. | Requires firmware adaptation for erase/write sequencing; no hardware-protected boot sector. | Select when cost sensitivity outweighs need for guaranteed bootloader security. |
| MX29LV160ETTI-55G | 48-pin TSOP, 16 Mbit (1M × 16), 5V, 55 ns, includes CFI-compliant boot block but requires voltage translation for 3.3V I/O compatibility. | Higher density and CFI support suit modern designs; incompatible pinout and voltage domain require PCB redesign. | Select for new designs needing scalability and industry-standard command interfaces, not drop-in replacement. |
Compared with SST39VF100A-55-4C-NHE and MX29LV160ETTI-55G, the AT49F1025-55JI uniquely combines industrial temperature operation, hardware-enforced boot block protection, and true 5V-only command compatibility in a legacy-compatible 44-pin PLCC footprint-making it irreplaceable for maintaining existing fielded systems without hardware revision.
Availability
AT49F1025-55JI is available at Aetrix Electronics and suitable for industrial PLCs, legacy embedded boot systems, automotive ECUs, point-of-sale terminals, and medical instrumentation requiring stable component supply with long lifecycle assurance.
Supply support for AT49F1025-55JI 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 product support, documentation, and qualification for legacy Atmel Flash devices including the AT49F1025 series.
The AT49F1025 belongs to Atmel's 5V parallel Flash memory product line, designed specifically for reliable, in-system reprogrammable firmware storage in industrial and automotive applications where robustness and long-term availability are critical.
FAQ
What is the operating temperature range for the AT49F1025-55JI?
The AT49F1025-55JI is rated for industrial operation from –40°C to +85°C. This specification is validated per the manufacturer's datasheet and applies to all DC and AC parameters including read access time (55 ns max), standby current (≤300 µA), and programming voltage tolerance. The "I" suffix in the part number explicitly denotes industrial temperature qualification, distinguishing it from commercial-grade variants like AT49F1025-55JC.
Does the AT49F1025-55JI require external high-voltage programming signals?
No, the AT49F1025-55JI operates exclusively from a single 5V supply for both read and reprogramming functions. Internal charge pumps generate necessary voltages for erase and program operations, eliminating the need for external 12V or 21V programming supplies. This 5V-only architecture simplifies power design and enhances system reliability compared to older EPROM or UV-erasable Flash technologies.
How is the boot block protected on the AT49F1025-55JI?
The AT49F1025-55JI provides hardware-enforced boot block lockout for its 8K-word region (addresses 0000H–1FFFH). Once activated via a specific six-command sequence (5555H/AA → 2AAAH/55 → 5555H/80 → 5555H/AA → 2AAAH/55 → 5555H/40), the boot block becomes permanently immune to erasure or programming. Protection status can be verified by reading I/O0 at address 0002H in software product identification mode.
What package type does the AT49F1025-55JI use?
The AT49F1025-55JI uses a 44-lead Plastic J-Leaded Chip Carrier (PLCC) package conforming to JEDEC standard MS-018AC. Its dimensions are 16.5 mm × 16.5 mm with a 1.27 mm lead pitch. Pin 1 is identified by a corner chamfer and dot; the package is socket-compatible with standard PLCC-44 sockets used in legacy industrial and automotive PCBs.
Can the AT49F1025-55JI be used as a direct replacement for the AT49F1024-55VI?
No-the AT49F1025-55JI and AT49F1024-55VI are functionally identical in memory organization, timing, and command set, but differ in package and pin count: AT49F1025-55JI uses 44-pin PLCC, while AT49F1024-55VI uses 40-pin VSOP. They are not pin-compatible, and PCB layout changes are required to substitute one for the other. The "J" vs "V" suffix explicitly denotes PLCC vs VSOP packaging.
AT49F1025-55JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-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:
- 64K x 16
- 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:
- 44-PLCC (16.6x16.6)
AT49F1025-55JI FAQ
1.How can I place an order for AT49F1025-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F1025-55JI 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 AT49F1025-55JI reliable?
The price and inventory of AT49F1025-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F1025-55JI is usually 5 days.
3.What payment methods are accepted for AT49F1025-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F1025-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F1025-55JI?
AT49F1025-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F1025-55JI 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 AT49F1025-55JI?
For technical support, including AT49F1025-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F1025-55JI requirements.
6.How does Aetrix verify that AT49F1025-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F1025-55JI 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 AT49F1025-55JI meets industry standards.
7.What is the process for return or replacement of AT49F1025-55JI?
All AT49F1025-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F1025-55JI, 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 AT49F1025-55JI part is unused and in its original packaging.
Return procedure for AT49F1025-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F1025-55JI 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…
