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Microchip Technology AT49F1025-55VC
- Part No.:
- AT49F1025-55VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F1025-55VC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,948
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Product details
Overview
AT49F1025-55VC from Microchip Technology is a 1-Mbit (128K × 8) parallel-access CMOS Flash memory IC with 55 ns access time, 5 V supply voltage, and JEDEC-standard 32-pin PLCC package. It serves as non-volatile program/data storage in embedded microcontroller systems requiring byte-level erase and write.
For engineers reviewing the AT49F1025-55VC datasheet, AT49F1025-55VC pinout, AT49F1025-55VC application, or AT49F1025-55VC equivalent, key selection criteria include access time compliance, single 5 V operation, sector erase architecture, and PLCC-32 mechanical compatibility for legacy industrial controller upgrades.
Technical Context
The AT49F1025-55VC implements a standard parallel NOR Flash interface with asynchronous read and write timing. It supports command-set-based operations including chip erase, sector erase (four 32K-byte sectors), and byte/word programming via CE#, OE#, and WE# control signals.
Internal address latching and data polling (DQ7) support verify-on-write and system-level erase monitoring. The device operates across commercial temperature range (0°C to +70°C) and meets JEDEC JESD22-A114 reliability standards for endurance (10,000 write/erase cycles) and data retention (20 years).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (128K × 8) - provides sufficient space for firmware images or configuration tables in 8-bit microcontroller systems. |
| Access Time | 55 ns - ensures compatibility with 18 MHz bus timing in legacy 8051 or Z80-based controllers. |
| Supply Voltage | 5.0 V ±10% - enables direct integration into 5 V logic systems without level-shifting circuitry. |
| Erase Architecture | Four 32K-byte sectors - allows selective firmware updates without full chip reprogramming. |
| Endurance | 10,000 write/erase cycles - supports field-upgradable features in industrial HMI or PLC modules. |
| Data Retention | 20 years at +85°C - guarantees long-term storage integrity in unattended equipment. |
Pinout & Package
AT49F1025-55VC is housed in a 32-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration and 1.27 mm pitch, compliant with JEDEC MO-047AB. The package is surface-mountable and designed for reflow soldering in industrial PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0 selects LSB byte. |
| DQ0–DQ7 | Data Input/Output | Bi-directional 8-bit data bus compatible with standard 8-bit microprocessor data paths. |
| CE# | Chip Enable | Active-low signal enabling device access; used for memory-mapped decoding in 8-bit systems. |
| OE# | Output Enable | Controls read-data output drivers; allows shared bus operation with other peripherals. |
| WE# | Write Enable | Controls write-cycle initiation; must be asserted during programming/erase commands. |
| VCC | Power Supply | +5 V supply input; requires local 0.1 µF ceramic decoupling per JEDEC guidelines. |
| GND | Ground | Reference return path for all digital and programming currents. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for dual-voltage regulators or charge pumps in legacy 5V designs. |
| Sector Erase Capability | Enables modular firmware updates by erasing only modified 32K-byte sections. |
| Data Polling (DQ7) | Allows host processor to monitor programming/erase completion without timeout delays. |
| JEDEC PLCC-32 Footprint | Supports drop-in replacement of obsolete 27C1024 or 28F1024 devices in existing layouts. |
| Hardware Data Protection | Upper and lower sector write protection via A9 address line state during power-up. |
Applications
| Industrial PLC Firmware Storage | Legacy 8-bit Microcontroller Boot Memory |
|---|---|
Use Scenario: Storing ladder logic programs and I/O configuration in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile boot and runtime code storage accessed via 8-bit parallel bus during cold start and online update. Use Value: Sector erase enables field updates of control logic without replacing the entire firmware image. | Use Scenario: Providing boot code and calibration tables for Z80- or 8051-based medical instrument controllers. IC Role / Device Role / Timing Role: Primary program memory mapped at reset vector address with 55 ns read latency. Use Value: Single 5 V operation simplifies power design and avoids level translation on data/address buses. |
| Automotive Diagnostic Tool Memory | Point-of-Sale Terminal Configuration Storage |
Use Scenario: Holding OBD-II protocol stacks and vehicle-specific diagnostic routines in handheld scan tools. IC Role / Device Role / Timing Role: Read-only execution memory during active diagnostics; updated via PC-connected programming mode. Use Value: 20-year data retention ensures firmware integrity over multi-decade tool service life. | Use Scenario: Storing localized language packs, tax tables, and peripheral driver settings in retail ECR systems. IC Role / Device Role / Timing Role: Byte-programmable configuration store accessed during terminal initialization and menu navigation. Use Value: Hardware write protection on upper/lower sectors prevents accidental corruption of critical parameters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F1025-70VC | Slower 70 ns access time; otherwise identical density, voltage, and package. | Acceptable where system bus speed ≤14 MHz; not suitable for 18 MHz timing-critical reads. | Select when cost optimization outweighs marginal timing margin requirements. |
| MX29LV1020TTC-70G | 3.3 V core supply (with 5 V I/O tolerance); 70 ns access; different command set and sector map. | Requires voltage translation and firmware adaptation; suited for mixed-voltage or low-power upgrade paths. | Choose only if migrating toward 3.3 V system architecture with redesign allowance. |
Compared with AT49F1025-55VC, the -70VC variant trades speed for cost in stable 5 V environments, while the MX29LV1020TTC-70G introduces voltage and command-set incompatibility-making it a redesign-dependent alternative rather than a drop-in option.
Availability
AT49F1025-55VC is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller boot systems, and automotive diagnostic tools requiring stable component supply and long-lifecycle support.
Supply support for AT49F1025-55VC 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog components, and non-volatile memory solutions for industrial, automotive, and consumer applications.
The AT49F1025-55VC belongs to Microchip's legacy parallel Flash memory product line, designed specifically for backward-compatible replacement of EPROM and earlier Flash devices in 5 V embedded systems.
FAQ
What is the operating voltage range for the AT49F1025-55VC?
The AT49F1025-55VC operates from 4.5 V to 5.5 V, with full specification compliance at 5.0 V ±10%. This single-supply requirement eliminates external voltage regulation complexity in legacy 5 V designs and ensures compatibility with TTL/CMOS logic families without level shifting.
Does the AT49F1025-55VC support byte-level programming?
Yes, the AT49F1025-55VC supports true byte-level programming: individual DQ0–DQ7 bits can be written without affecting adjacent bytes. This capability is essential for updating configuration parameters or patching firmware in field-deployed equipment where full-sector erase would be disruptive.
How many erase sectors does the AT49F1025-55VC have, and what is their size?
The AT49F1025-55VC contains four uniform 32K-byte erase sectors, totaling the full 128K-byte memory array. Each sector can be erased independently using the standard JEDEC command sequence, enabling modular firmware updates and reducing downtime during field maintenance.
Is the AT49F1025-55VC pin-compatible with the AT29C1024?
No, the AT49F1025-55VC is not pin-compatible with the AT29C1024. While both are 1-Mbit parallel Flash devices in PLCC-32 packages, the AT29C1024 uses a different sector architecture and lacks hardware write protection via A9, requiring PCB layout and firmware changes for substitution.
What is the maximum number of write/erase cycles guaranteed for the AT49F1025-55VC?
The AT49F1025-55VC is guaranteed for 10,000 write/erase cycles per sector, as verified under JEDEC JESD22-A117 stress conditions. This endurance rating supports repeated field updates in industrial control applications where firmware revisions occur multiple times per year over a 10+ year product lifecycle.
AT49F1025-55VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSOP
AT49F1025-55VC FAQ
1.How can I place an order for AT49F1025-55VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F1025-55VC 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 AT49F1025-55VC reliable?
The price and inventory of AT49F1025-55VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F1025-55VC is usually 5 days.
3.What payment methods are accepted for AT49F1025-55VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F1025-55VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F1025-55VC?
AT49F1025-55VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F1025-55VC 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 AT49F1025-55VC?
For technical support, including AT49F1025-55VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F1025-55VC requirements.
6.How does Aetrix verify that AT49F1025-55VC is sourced from the original manufacturer or authorized distributors?
All AT49F1025-55VC 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 AT49F1025-55VC meets industry standards.
7.What is the process for return or replacement of AT49F1025-55VC?
All AT49F1025-55VC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F1025-55VC, 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 AT49F1025-55VC part is unused and in its original packaging.
Return procedure for AT49F1025-55VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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