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Microchip Technology AT49BV040A-70JU
- Part No.:
- AT49BV040A-70JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV040A-70JU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
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Product details
Overview
AT49BV040A-70JU from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) single-supply, in-system reprogrammable Flash memory IC designed for embedded boot code and parameter storage. It operates from 2.7 V to 3.6 V, delivers 70 ns read access time, supports byte-by-byte programming at 30 µs/byte, and features hardware data protection with 10,000 write/erase cycles. It is used in industrial microcontroller-based systems requiring reliable nonvolatile firmware storage.
For engineers reviewing the AT49BV040A-70JU datasheet, AT49BV040A-70JU pinout, AT49BV040A-70JU application, or AT49BV040A-70JU equivalent, this page provides verified technical context, sector architecture details, boot block lockout behavior, DATA polling and toggle bit implementation guidance, and real-world design considerations for in-system reprogramming in temperature-stable industrial environments.
Technical Context
The AT49BV040A-70JU implements a sector-erasable Flash architecture with one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks, and eight main memory blocks (one 32 KB + seven 64 KB). Erase and program operations are controlled via six-cycle software command sequences using standard CE/OE/WE timing without external high-voltage circuitry.
It uses internal voltage regulation and sensing to inhibit programming below 1.8 V, includes noise filtering on WE/CE inputs (<15 ns pulse rejection), and supports dual end-of-operation detection: DATA polling (I/O7 complement) and toggle bit (I/O6 toggling). Read operation mirrors EPROM timing with CE/OE dual enable control to prevent bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits - directly maps to 8-bit microcontroller data buses without address translation. |
| Read Access Time | 70 ns max - enables direct interface with 12 MHz+ microcontrollers without wait states in standard read mode. |
| Byte Programming Time | 30 µs typical - allows rapid field updates of small configuration or calibration data without system interruption. |
| Chip Erase Time | 12 seconds max - full-device erase completes within deterministic time, critical for production programming and recovery workflows. |
| Operating Voltage | 2.7 V to 3.6 V - compatible with single Li-ion battery or regulated 3.3 V rails, eliminating need for separate 5 V or 12 V programming supplies. |
| Standby Current | 50 µA CMOS - supports ultra-low-power sleep modes in battery-backed industrial controllers and IoT edge nodes. |
| Endurance | 10,000 program/erase cycles - sufficient for firmware update cycles over 5+ years in deployed industrial equipment. |
| Temperature Range | −40°C to +85°C - qualified for industrial-grade operation in harsh ambient conditions without derating. |
Pinout & Package
AT49BV040A-70JU is supplied in a 32-lead PLCC (Plastic Leaded Chip Carrier) package (JEDEC MS-016, Variation AE), measuring 12.32 mm × 12.32 mm × 3.56 mm (max height), with J-leads and pin 1 identifier marked by a corner chamfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11 is don't-care in command cycles per datasheet note. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for toggle bit detection during program/erase. |
| CE | Chip Enable | Active-low chip select; must be low with OE low for read, low with WE low for write - enables multi-device bus sharing. |
| OE | Output Enable | Active-low output control; high-Z when high, allowing bus isolation during write or standby - prevents contention with MCU data bus. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing - central to all programming/erase sequences. |
| VCC | Power Supply | 2.7–3.6 V supply; internally regulated for programming - eliminates external charge pumps or HV generators. |
| GND | Ground Reference | Common return for VCC, I/O, and control signals; decoupling required within 10 mm of VCC pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB region (00000H–03FFFH) permanently protected after 6-cycle command sequence - ensures bootloader integrity during field firmware updates. |
| Sector-Erasable Architecture | 11 independently erasable sectors (1 boot + 2 parameter + 8 main) - enables selective reprogramming without disturbing secure or calibrated data. |
| DATA Polling & Toggle Bit | Real-time status feedback via I/O7 (complement read) or I/O6 (toggle) - eliminates need for fixed delay timers in host firmware, improving reliability and speed. |
| Hardware Data Protection | VCC sense (<1.8 V inhibition), noise filtering (<15 ns pulse rejection), and control-line interlock (OE high/CE high/WE high blocks writes) - prevents accidental corruption during power transients or EMI events. |
| Green Packaging | Pb/Halide-free PLCC (JU suffix) - meets RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 moisture sensitivity level. |
Applications
| Industrial PLC Firmware Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing boot firmware and runtime configuration in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory with guaranteed 70 ns read access and sector-erase capability for incremental firmware patches. Use Value: Boot block lockout prevents accidental overwrite of safety-critical startup code while enabling field updates to application logic in main memory blocks. |
Use Scenario: Retaining calibrated sensor offsets and device-specific correction coefficients in portable diagnostic instruments. IC Role / Device Role / Timing Role: Parameter storage with 8 KB parameter blocks accessible via dedicated sector erase - avoids full-chip erase during recalibration. Use Value: Enables safe, fast, and repeatable recalibration without risking bootloader or application firmware integrity. |
| Automotive Body Control Module | Networking Equipment Configuration |
|
Use Scenario: Holding EEPROM-like configuration data (e.g., door lock settings, lighting profiles) in 12 V automotive subsystems with local 3.3 V regulation. IC Role / Device Role / Timing Role: Low-voltage Flash memory with 50 µA standby current and −40°C to +85°C qualification - matches automotive ambient requirements. Use Value: Eliminates need for external 5 V regulators or backup batteries while meeting AEC-Q200-relevant thermal and endurance specs. |
Use Scenario: Storing boot images and network stack parameters in Ethernet switches and wireless access points with frequent firmware upgrades. IC Role / Device Role / Timing Role: In-system reprogrammable Flash with DATA polling support - allows host processor to initiate and verify updates without dedicated programmer hardware. Use Value: Reduces BOM cost and board space by replacing discrete EEPROM + supervisor IC combinations with a single integrated solution. |
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, 3.0–3.6 V; same PLCC-32 package but uses different command set (SST proprietary) and lacks boot block lockout. | No hardware-enforced boot sector protection; requires software-managed write disable - higher risk of accidental bootloader corruption. | Choose only if SST's faster 18 µs byte program time is prioritized over boot integrity assurance. |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns, 3.0–3.6 V; TSOP-48 package (not pin-compatible), includes CFI query support and wider temperature range (−40°C to +105°C). | Requires PCB redesign due to 48-pin TSOP footprint and different pinout; CFI compatibility simplifies generic flash drivers but adds complexity for legacy systems. | Select when extended temperature margin or standardized CFI interface is mandatory, and board layout can accommodate larger package. |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT49BV040A-70JU uniquely combines PLCC-32 pinout compatibility, hardware boot block lockout, and proven 10,000-cycle endurance in industrial temperature grade - making it optimal for legacy designs where bootloader security and drop-in replacement are primary concerns.
Availability
AT49BV040A-70JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device calibration data retention, and automotive body control module configuration requiring stable component supply across long product lifecycles.
Supply support for AT49BV040A-70JU 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 AT49BV040A series. The company specializes in microcontrollers, analog, and nonvolatile memory solutions for industrial, automotive, and consumer markets.
The AT49BV040A product line was developed to provide cost-effective, single-supply Flash memory for embedded boot code and parameter storage in resource-constrained 8-bit and 16-bit microcontroller systems - emphasizing in-system reprogrammability without high-voltage circuitry.
FAQ
What is the maximum operating temperature range for the AT49BV040A-70JU?
The AT49BV040A-70JU is rated for industrial operation from −40°C to +85°C. This range is validated per the DC and AC operating specifications in the datasheet, and applies to all electrical parameters including 70 ns read access time, 30 µs byte programming, and 50 µA standby current. The PLCC package's thermal characteristics support sustained operation within this envelope without derating.
Does the AT49BV040A-70JU require external high-voltage programming circuitry?
No, the AT49BV040A-70JU does not require external high-voltage programming circuitry. All programming and erase operations are executed using standard 2.7–3.6 V logic-level signals and six-cycle software command sequences. Internal charge pumps generate necessary voltages, and VCC sense circuitry inhibits programming if supply drops below ~1.8 V - enabling true single-supply in-system reprogramming.
How is boot block protection enabled on the AT49BV040A-70JU?
Boot block protection on the AT49BV040A-70JU is enabled via a precise six-cycle command sequence: load 0xAA to address 0x555, 0x55 to address 0xAAA, 0x80 to 0x555, then 0xAA, 0x55, and 0x40 to 0x555. After execution and a 1-second pause, the 16 KB boot sector (00000H–03FFFH) becomes permanently write- and erase-protected. Status is verifiable via software product identification mode reading I/O0 at address 00002H.
Can the AT49BV040A-70JU be used as a direct replacement for the AT49BV040A-70JI?
Yes, the AT49BV040A-70JU is a direct replacement for the AT49BV040A-70JI in terms of pinout, timing, command set, and electrical specifications. The only difference is the "U" suffix denoting Pb/Halide-free (RoHS-compliant) green packaging, whereas "I" indicates standard leaded PLCC. No PCB or firmware changes are required for migration.
What methods does the AT49BV040A-70JU provide to detect completion of a program or erase cycle?
The AT49BV040A-70JU provides two hardware-supported methods: DATA polling (read last programmed byte - I/O7 returns complement until complete, then true data) and toggle bit (I/O6 toggles between 0 and 1 during operation, stops when complete). Both methods allow the host MCU to poll asynchronously without fixed delays, improving system responsiveness and reliability over timer-based approaches.
AT49BV040A-70JU 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:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49BV040A-70JU FAQ
1.How can I place an order for AT49BV040A-70JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-70JU 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 AT49BV040A-70JU reliable?
The price and inventory of AT49BV040A-70JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040A-70JU is usually 5 days.
3.What payment methods are accepted for AT49BV040A-70JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-70JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-70JU?
AT49BV040A-70JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-70JU 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 AT49BV040A-70JU?
For technical support, including AT49BV040A-70JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-70JU requirements.
6.How does Aetrix verify that AT49BV040A-70JU is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-70JU 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 AT49BV040A-70JU meets industry standards.
7.What is the process for return or replacement of AT49BV040A-70JU?
All AT49BV040A-70JU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-70JU, 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 AT49BV040A-70JU part is unused and in its original packaging.
Return procedure for AT49BV040A-70JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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