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Microchip Technology AT49F040A-70TU
- Part No.:
- AT49F040A-70TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F040A-70TU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,670
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Product details
Overview
AT49F040A-70TU from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) 5V-only in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It features 55 ns read access time, 20 µs/byte programming, 6-second chip erase, 10,000 write cycles, and hardware data protection with VCC sense and noise filtering - deployed in industrial control firmware storage and boot code retention applications.
For engineers reviewing the AT49F040A-70TU datasheet, AT49F040A-70TU pinout, AT49F040A-70TU application, or AT49F040A-70TU equivalent, key selection considerations include sector architecture (1×16KB boot block + 2×8KB parameter blocks + 8×main blocks), DATA polling/toggle bit end-of-program detection, 5V-only command interface, and PLCC/TSOP-32 packaging compatibility with legacy EPROM sockets.
Technical Context
The AT49F040A-70TU implements a standard parallel Flash architecture with CE/OE/WE control logic, supporting EPROM-like read timing and software-controlled byte programming via 4-cycle command sequences. Its internal program controller manages pulse generation and timing without external clocks.
It uses a hierarchical sector erase model: boot block (00000H–03FFFH) supports optional permanent lockout; parameter blocks (04000H–07FFFH) and eight main memory blocks (08000H–7FFFFH) support independent 6-second erase cycles. Erase and program operations are internally timed and verified via DATA polling (I/O7 complement) or toggle bit (I/O6 toggling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 70 ns max (tACC) - compatible with 14 MHz bus timing in industrial microcontroller systems. |
| Byte Programming Time | 20 µs typical (tBP) - enables fast field updates of configuration parameters without system reset. |
| Chip Erase Time | 12 seconds max (tEC) - allows full memory reset during factory programming or recovery mode. |
| Write Endurance | 10,000 program/erase cycles - sufficient for firmware update cycles over 5+ years in industrial logging devices. |
| Power Dissipation | 20 mA active current / 70 µA CMOS standby - reduces thermal load and enables low-power sleep modes in battery-backed systems. |
| Operating Voltage | 5.0 V ±10% - eliminates need for dual-voltage supply rails in legacy 5V designs. |
Pinout & Package
AT49F040A-70TU is available in 32-lead TSOP (Type 1, 8 × 20 mm) and 32-lead PLCC packages. Both share identical pin functions and logic-level compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing (00000H–7FFFFH); A11–A18 don't care in command cycles. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read data output and program data input; supports DATA polling on I/O7 and toggle bit on I/O6. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; controls address latching in command cycles. |
| OE | Output Enable | Active-low output gate; places I/O pins in high-impedance state when high to prevent bus contention during shared-memory operation. |
| WE | Write Enable | Active-low write strobe; initiates byte programming, sector erase, and command loading; latches data on rising edge in command sequences. |
| VCC | Power Supply | +5.0 V ±10% supply; internal VCC sense disables programming if voltage drops below 3.8 V (typical). |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal logic; decoupling required per JEDEC TSOP/PLCC layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for +12V programming voltage - simplifies power design and enables in-system reprogramming via standard microcontroller GPIOs. |
| Boot Block Lockout | 16 KB (00000H–03FFFH) permanently protected after 6-command sequence - ensures bootloader integrity during field firmware updates. |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide real-time, hardware-verified program/erase completion - removes need for fixed delay timers in host firmware. |
| Sector-Erase Architecture | Independent erasure of 2×8 KB parameter blocks and 8 main memory blocks - enables selective firmware patching without full chip erase. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibit (OE high/CE high/WE high) prevent accidental writes - critical for reliability in electrically noisy industrial environments. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Nonvolatile code storage with 70 ns read timing synchronized to 14 MHz microcontroller bus; boot block lockout prevents corruption of safety-critical startup routines. Use Value: Enables field-upgradable firmware while guaranteeing bootloader integrity across 10,000+ update cycles and -40°C to +85°C operation. | Use Scenario: Holding certified bootloader and calibration data in portable diagnostic equipment requiring regulatory compliance and long-term data retention. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for FDA-cleared boot code; sector erase allows safe parameter updates without risking bootloader overwrite. Use Value: Meets IEC 62304 software lifecycle requirements via hardware-enforced boot block protection and 10,000-cycle endurance. |
| Automotive Body Control Module | Legacy Industrial HMI Display |
Use Scenario: Storing lighting control algorithms and CAN message lookup tables in under-hood body control units exposed to thermal cycling and vibration. IC Role / Device Role / Timing Role: 5V-only Flash memory interfaced directly to 8051-based MCU; 70 ns access meets timing budget for real-time sensor response loops. Use Value: Reduces BOM count by eliminating level shifters; green (Pb/halide-free) TSOP package complies with automotive RoHS requirements. | Use Scenario: Replacing obsolete 27C040 EPROMs in panel-mounted HMIs using existing socketed PLCC-32 footprints and 5V bus architecture. IC Role / Device Role / Timing Role: Pin-compatible Flash replacement with identical CE/OE/WE timing and EPROM-style read behavior - no PCB redesign required. Use Value: Extends product lifecycle by enabling in-system firmware updates without removing the board from the enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns, 3.3V core (5V I/O tolerant), 12V programming not required - differs in voltage domain and command set. | Requires level translation in pure 5V systems; better suited for mixed-voltage designs with 3.3V MCUs. | Select only if migrating to lower-voltage logic; not drop-in compatible due to VCC dependency and different sector map. |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns, 3.0–3.6V operation only - no 5V support; C-type (top-boot) sector configuration differs from AT49F040A's 16KB boot block at 00000H. | Not usable in legacy 5V systems; boot block location mismatch prevents direct bootloader replacement. | Consider only for new 3.3V designs where top-boot architecture aligns with bootloader placement requirements. |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT49F040A-70TU provides true 5V-only operation, identical EPROM timing, and a fixed 16KB bottom-boot block - making it the sole option for drop-in replacement and in-system reprogramming in legacy 5V industrial controllers.
Availability
AT49F040A-70TU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code retention, and automotive body control module applications requiring stable component supply and long-lifecycle support.
Supply support for AT49F040A-70TU 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 AT49F040A series. The company specializes in microcontrollers, analog, and nonvolatile memory solutions for industrial, automotive, and consumer markets.
The AT49F040A product line was designed for cost-sensitive, 5V-based embedded systems requiring field-upgradable firmware storage with hardware-enforced boot code protection - targeting industrial automation, medical instrumentation, and legacy automotive subsystems.
FAQ
What is the maximum operating temperature range for the AT49F040A-70TU?
The AT49F040A-70TU is rated for industrial operation from -40°C to +85°C. This range is validated per the device's DC and AC operating specifications and applies to both PLCC and TSOP packages. Thermal derating is not required within this envelope, and the 70 ns access time is guaranteed across the full temperature span.
Does the AT49F040A-70TU require external high-voltage programming signals?
No, the AT49F040A-70TU does not require external high-voltage programming signals. It operates exclusively from a 5.0 V ±10% supply and uses internal charge pumps to generate necessary programming voltages. All commands - including byte programming, sector erase, and boot lockout - are executed using standard 5V logic levels on CE, OE, WE, and I/O lines.
How is the boot block protected from accidental reprogramming in the AT49F040A-70TU?
The AT49F040A-70TU boot block (00000H–03FFFH) is protected via a six-command software lockout sequence that permanently disables erase and program operations to that sector. Once enabled, the lockout cannot be reversed. Detection is performed by reading I/O0 at address 00002H in software product identification mode: a high level indicates active lockout.
Can the AT49F040A-70TU be used as a direct replacement for standard EPROMs like the 27C040?
Yes, the AT49F040A-70TU is functionally and pin-compatible with 27C040 EPROMs in read mode, sharing identical CE/OE/WE control, 5V operation, and 32-pin PLCC/TSOP footprints. However, it requires command-based programming instead of UV erasure, and its write cycle timing differs - host firmware must implement the documented command sequences for erase and program operations.
What methods does the AT49F040A-70TU provide to detect completion of a programming cycle?
The AT49F040A-70TU provides two hardware-verified methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion, then true data) and toggle bit detection (I/O6 toggles between 0 and 1 during programming and stops upon completion). Both methods eliminate reliance on fixed software delays and improve host system responsiveness.
AT49F040A-70TU 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:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 40µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49F040A-70TU FAQ
1.How can I place an order for AT49F040A-70TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040A-70TU 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 AT49F040A-70TU reliable?
The price and inventory of AT49F040A-70TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040A-70TU is usually 5 days.
3.What payment methods are accepted for AT49F040A-70TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040A-70TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040A-70TU?
AT49F040A-70TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040A-70TU 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 AT49F040A-70TU?
For technical support, including AT49F040A-70TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040A-70TU requirements.
6.How does Aetrix verify that AT49F040A-70TU is sourced from the original manufacturer or authorized distributors?
All AT49F040A-70TU 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 AT49F040A-70TU meets industry standards.
7.What is the process for return or replacement of AT49F040A-70TU?
All AT49F040A-70TU units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040A-70TU, 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 AT49F040A-70TU part is unused and in its original packaging.
Return procedure for AT49F040A-70TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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