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Microchip Technology AT49F002T-12TC
- Part No.:
- AT49F002T-12TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F002T-12TC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,057
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Product details
Overview
AT49F002T-12TC from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC with 120 ns read access time, sector-based architecture (16K-byte boot block + two 8K-byte parameter blocks + two main memory blocks), and hardware data protection. It operates across industrial temperature range (−40°C to +85°C) and supports byte-by-byte programming (10 µs/byte typical) and chip/sector erase (10 s max). It is used in embedded firmware storage for industrial controllers requiring secure boot code retention.
For engineers reviewing the AT49F002T-12TC datasheet, AT49F002T-12TC pinout, AT49F002T-12TC application, or AT49F002T-12TC equivalent, key selection considerations include boot block lockout behavior (12V RESET override enabled), TSOP-32 package compatibility, 5V-only command interface, and sector erase granularity for field firmware updates.
Technical Context
The AT49F002T-12TC implements a command-register-based Flash architecture with software-controlled erase and program operations using six-cycle sequences (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H). Its memory map places the 16K-byte boot block at address 3C000H–3FFFFH, distinct from the AT49F002(N) variant's 00000H–03FFFH location.
It features dual-line control (CE/OE) for bus contention avoidance, DATA polling (I/O7 complement) and Toggle Bit (I/O6) for operation completion detection, and VCC sense circuitry that inhibits programming below 3.8 V. The RESET pin supports both standard reset (high-Z output) and 12V override of boot block lockout - a capability absent in AT49F002N(T) variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 120 ns max - compatible with 8 MHz bus timing in legacy industrial microcontroller systems. |
| Byte Programming Time | 10 µs typical - enables rapid field patching of small code segments without full reflash. |
| Erase Cycle Time | 10 seconds max (chip or sector) - allows predictable downtime during firmware update sequences. |
| Operating Voltage | 5.0 V ±10% - single-supply operation eliminates need for charge pumps or auxiliary voltage rails. |
| Standby Current | 100 µA (CMOS) - suitable for low-power modes in battery-backed or energy-conscious embedded systems. |
| Endurance | 10,000 write/erase cycles - sufficient for firmware update intervals exceeding 5 years in typical industrial deployments. |
| Temperature Range | −40°C to +85°C - qualified for industrial-grade operation in motor drives, PLCs, and factory automation equipment. |
Pinout & Package
AT49F002T-12TC is housed in a 32-lead Plastic Thin Small Outline Package (TSOP, Type 1, 8 × 20 mm), compliant with JEDEC MO-153. Pin 1 is located at bottom-left corner (index mark), with pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A17 selects upper/lower half of memory space. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with standard microprocessor data buses; high-impedance when CE or OE inactive. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - prevents bus contention. |
| OE | Output Enable | Active-low output control; used with CE to gate data output - enables shared-bus arbitration without external logic. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing - critical for reliable programming. |
| RESET | Reset & Boot Override | Logic-high = normal operation; logic-low = high-Z outputs; 12V input = overrides boot block lockout - unique security and recovery feature. |
| VCC | Power Supply | +5.0 V ±10% supply; powers core logic and array - requires local 0.1 µF decoupling per datasheet layout guidelines. |
| GND | Ground Reference | Signal and power ground reference plane - must be low-impedance connection to minimize noise coupling into I/O lines. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout with 12V Override | 16K-byte boot sector (3C000H–3FFFFH) permanently protected under 5.5 V; 12V on RESET enables reprogramming - ensures bootloader integrity while allowing emergency recovery. |
| Sector-Erasable Architecture | Independent erasure of two 8K-byte parameter blocks and two main memory blocks (96K/128K bytes) - enables modular firmware updates without full chip erase. |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) - prevents accidental corruption during power transients or EMI events. |
| DATA Polling & Toggle Bit | I/O7 complement indicates programming completion; I/O6 toggles during erase/program - eliminates need for fixed delay timers in host firmware, improving update reliability. |
| 5V-Only Command Interface | All read, program, and erase operations executed via standard 5V logic levels - removes requirement for high-voltage programming supplies or level shifters in system design. |
Applications
| Industrial PLC Firmware Storage | Secure Bootloader Memory |
|---|---|
Use Scenario: Storing ladder logic programs and configuration data in programmable logic controllers deployed in factory environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-erase capability enabling partial updates; 120 ns access supports real-time scan cycle execution. Use Value: Boot block lockout prevents unauthorized modification of safety-critical startup routines, while parameter block erasure allows runtime calibration data updates without disrupting operational code. | Use Scenario: Holding immutable bootloader code in medical diagnostic equipment where regulatory compliance mandates verified boot chain integrity. IC Role / Device Role / Timing Role: Secure, tamper-resistant boot memory with 12V RESET override for certified recovery procedures - meets IEC 62304 Class C requirements. Use Value: Ensures bootloader remains unaltered during field firmware upgrades; 12V override provides auditable, hardware-gated recovery path approved by certification bodies. |
| Legacy Microcontroller Code Storage | Parameter Configuration Memory |
Use Scenario: Replacing EPROMs in aging 8051- or Z80-based instrumentation systems requiring in-system reprogramming without socket removal. IC Role / Device Role / Timing Role: Drop-in EPROM replacement with identical CE/OE/WE control protocol and 5V-only operation - no board redesign needed. Use Value: Eliminates UV-erasure step and programming socket; 10 µs/byte programming enables faster production line firmware loading than EPROM burners. | Use Scenario: Storing calibration coefficients, device IDs, and user preferences in HVAC controllers subject to frequent field service visits. IC Role / Device Role / Timing Role: Dedicated nonvolatile parameter storage with independent 8K-byte sector erasure - avoids rewriting entire firmware image for minor configuration changes. Use Value: Reduces field update time by >90% versus full-flash reprogramming; sector isolation prevents accidental corruption of active firmware during parameter edits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002T-12JI | Same die, PLCC-32 package, industrial temp; no RESET pin functionality (RESET pin is DC) | Lacks 12V boot override; requires external reset management; unsuitable for safety-critical recovery paths | Select only if board uses PLCC socket and boot block override is unnecessary |
| SST39VF020-90-4C-NHE | 2 Mbit, 90 ns access, 3.3 V core (5V tolerant I/O); different command set; no 12V RESET override | Requires level translation for 5V systems; lacks hardware boot lockout override; higher standby current (1 µA vs 100 µA) | Choose for lower-power 3.3V designs where boot security model differs and 12V override is not required |
Compared with AT49F002T-12TC, AT49F002T-12JI sacrifices boot block recovery capability for PLCC compatibility, while SST39VF020 shifts to 3.3V operation and abandons the 12V hardware override - making AT49F002T-12TC uniquely suited for industrial 5V systems demanding auditable, hardware-enforced bootloader protection.
Availability
AT49F002T-12TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, secure bootloader memory, and legacy microcontroller code storage requiring stable component supply, long-term lifecycle support, and guaranteed TSOP-32 packaging consistency.
Supply support for AT49F002T-12TC 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 for industrial, automotive, and consumer applications.
The AT49F002T series belongs to Atmel's 5V Flash memory product line, designed specifically for in-system reprogrammability in legacy 5V embedded systems requiring robust boot code protection and sector-level firmware update flexibility.
FAQ
What is the memory organization of the AT49F002T-12TC?
The AT49F002T-12TC contains 2 Mbit of Flash memory organized as 262,144 words × 8 bits (256K × 8). Its physical address space spans 00000H to 3FFFFH, with the 16K-byte boot block located at 3C000H–3FFFFH - a key distinction from the AT49F002(N) variant's boot block placement. This layout enables deterministic boot code isolation.
Does the AT49F002T-12TC support in-system programming without high-voltage supplies?
Yes, the AT49F002T-12TC supports full in-system reprogramming using only 5V logic levels - no external high-voltage programming supply is required. All command sequences (read, program, erase, lockout enable) operate within the 5.0 V ±10% VCC range, simplifying system-level design and eliminating charge pump circuitry.
How does the boot block lockout feature work on the AT49F002T-12TC?
The AT49F002T-12TC's boot block lockout is enabled via a six-cycle command sequence (5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → 5555H/40H). Once activated, the 16K-byte boot block (3C000H–3FFFFH) cannot be erased or programmed at ≤5.5 V - but 12V applied to RESET restores full reprogrammability.
What package type is used for the AT49F002T-12TC?
The AT49F002T-12TC is supplied in a 32-lead Plastic Thin Small Outline Package (TSOP, Type 1, 8 × 20 mm), designated as package code "32T" in Atmel's ordering nomenclature. This surface-mount package supports automated PCB assembly and offers thermal performance suitable for industrial ambient conditions.
Can the AT49F002T-12TC be used as a direct replacement for EPROMs like the 27C256?
Yes, the AT49F002T-12TC is functionally compatible with 27C256 EPROMs in read mode: it uses identical CE/OE/WE control signaling, 5V supply, and 256K × 8 organization. However, it adds in-system reprogrammability, sector erase, and hardware data protection - requiring only minor firmware adaptation to leverage its enhanced features.
AT49F002T-12TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49F002T-12TC FAQ
1.How can I place an order for AT49F002T-12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002T-12TC 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 AT49F002T-12TC reliable?
The price and inventory of AT49F002T-12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002T-12TC is usually 5 days.
3.What payment methods are accepted for AT49F002T-12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002T-12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002T-12TC?
AT49F002T-12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002T-12TC 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 AT49F002T-12TC?
For technical support, including AT49F002T-12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002T-12TC requirements.
6.How does Aetrix verify that AT49F002T-12TC is sourced from the original manufacturer or authorized distributors?
All AT49F002T-12TC 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 AT49F002T-12TC meets industry standards.
7.What is the process for return or replacement of AT49F002T-12TC?
All AT49F002T-12TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002T-12TC, 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 AT49F002T-12TC part is unused and in its original packaging.
Return procedure for AT49F002T-12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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