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Microchip Technology AT49BV040B-JU
- Part No.:
- AT49BV040B-JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV040B-JU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49BV040B-JU from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) in-system reprogrammable Flash memory IC designed for embedded firmware storage and boot code retention. It operates from a single 2.7V–3.6V or 4.5V–5.5V supply, delivers 70 ns read access at 3.3V and 55 ns at 5V, supports sector-erase with 8-second chip-erase time, and integrates hardware data protection including VCC sense and noise filtering. It is used in industrial controllers requiring field-upgradable firmware with secure boot-sector locking.
For engineers reviewing the AT49BV040B-JU datasheet, AT49BV040B-JU pinout, AT49BV040B-JU application, or AT49BV040B-JU equivalent, key selection criteria include its flexible sector architecture (1×16KB boot + 2×8KB parameter + 8×main sectors), byte-programming time (10 µs typical), CMOS standby current (25 µA @ 3.3V), 100,000 write/erase cycles, and compatibility with standard EPROM-like CE/OE/WE control interface.
Technical Context
The AT49BV040B-JU implements a nonvolatile CMOS Flash architecture with internal program control logic and auto-timed erase/program operations. Its command-set-driven operation-requiring specific address/data sequences (e.g., 555H/AAH, AAAH/55H) for chip erase, sector erase, and boot lockout-eliminates need for external high-voltage programming supplies.
It features dual-voltage operation with distinct AC timing bins: 70 ns access at 2.7–3.6 V and 55 ns at 4.5–5.5 V; supports DATA polling (I/O7 complement toggle) and Toggle Bit (I/O6 toggling) for cycle completion detection; and provides hardware-level protection via VCC sense (<1.8 V inhibits programming), OE/CE/WE state monitoring, and 15 ns noise filtering on control inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), organized as 16KB boot + 2×8KB parameter + 1×32KB + 7×64KB main sectors |
| Read Access Time | 70 ns @ VCC = 2.7–3.6 V; 55 ns @ VCC = 4.5–5.5 V - enables direct replacement of 3.3V/5V EPROMs in legacy designs |
| Byte Programming Time | 10 µs typical - allows rapid field updates without system downtime |
| Chip Erase Time | 8 seconds maximum - deterministic full-array reset for recovery or reinitialization |
| End-of-Cycle Detection | DATA Polling (I/O7) and Toggle Bit (I/O6) - eliminates need for fixed delay timers in host firmware |
| Write Endurance | ≥100,000 program/erase cycles - validated for long-life industrial firmware storage |
| Standby Current | 25 µA @ 2.7–3.6 V; 30 µA @ 4.5–5.5 V - supports low-power sleep modes in battery-backed systems |
Pinout & Package
AT49BV040B-JU is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC), JEDEC MS-016 variation AE compliant, with 1.27 mm pitch, 12.45 mm × 12.45 mm body, and pin 1 identifier corner marking. Pin 1 is located at top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11–A0 used for command entry |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access |
| OE | Output Enable | Active-low output gate; controls data bus drive to prevent contention during shared-bus operation |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge for command and programming sequences |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; carries command data, product ID codes, and memory contents; supports polling/toggle bit on I/O6/I/O7 |
| VCC | Power Supply | Single 2.7–5.5 V supply; internally regulated for core logic and array programming |
| GND | Ground Reference | Common return path for all signals and power; decoupling required per JEDEC PLCC layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Boot Sector Lockout | 16 KB (00000H–03FFFH) programmable lockout via 6-cycle command sequence - ensures immutable bootloader integrity |
| Flexible Sector Architecture | Independent erasability of boot, parameter (2×8 KB), and main memory (1×32 KB + 7×64 KB) sectors - enables selective firmware updates without full chip erase |
| Hardware Data Protection | VCC sense (<1.8 V disables programming), OE/CE/WE state monitoring, and 15 ns input noise filtering - prevents spurious writes in electrically noisy environments |
| Standard EPROM Interface | CE/OE/WE control with no external high-voltage requirements - simplifies migration from EPROM-based designs and reduces BOM count |
| End-of-Cycle Signaling | DATA Polling (I/O7) and Toggle Bit (I/O6) - enables host microcontroller to poll asynchronously instead of using fixed timeouts |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with in-system reprogrammability and hardware-locked boot sector to prevent corruption during remote updates. Use Value: Enables field firmware upgrades without hardware intervention while guaranteeing bootloader integrity via 16 KB protected sector. | Use Scenario: Holding certified boot code and calibration data in Class II medical diagnostic equipment subject to regulatory traceability requirements. IC Role / Device Role / Timing Role: Secure, long-life flash memory with 100,000-cycle endurance and deterministic 8-second chip erase for safe recovery after failed update. Use Value: Meets IEC 62304 software lifecycle requirements through verified write endurance and hardware-enforced boot protection. |
| Automotive Body Control Module | Telecom Remote Node Configuration |
Use Scenario: Storing vehicle-specific configuration tables and minor firmware patches in body control units where ECU reflash is infrequent but critical. IC Role / Device Role / Timing Role: Low-power (25 µA standby @ 3.3 V), single-supply flash memory supporting CAN-based bootloader protocols. Use Value: Reduces quiescent current in always-on modules while enabling secure, sector-granular updates without disrupting CAN bus operation. | Use Scenario: Holding FPGA configuration bitstreams and protocol stack parameters in outdoor telecom base station remote radios exposed to wide temperature swings. IC Role / Device Role / Timing Role: Industrial-grade (-40°C to +85°C) Flash memory with 70 ns read access at 3.3 V and robust noise immunity for reliable operation in RF-dense environments. Use Value: Ensures fast configuration load times and immunity to EMI-induced false writes via hardware VCC sense and 15 ns input filtering. |
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 (512K × 8), 70 ns access, 3.0–3.6 V only; lacks boot sector lockout; uses different command set | Not suitable for secure boot applications; requires voltage translation for 5 V systems | Select if operating exclusively at 3.3 V and boot protection is unnecessary |
| MX29LV400CTTI-70G | 4 Mbit (512K × 8), 70 ns access, 2.7–3.6 V; includes CFI-compliant command set and 16 KB boot sector, but no hardware lockout | Relies on software-based protection; less robust against accidental overwrite than AT49BV040B-JU's hardware lockout | Select if CFI compatibility and standardized JEDEC interface are prioritized over hardware boot security |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT49BV040B-JU uniquely combines dual-voltage support (2.7–5.5 V), hardware-enforced boot sector lockout, and deterministic 8-second chip erase - making it optimal for mixed-voltage industrial systems requiring tamper-resistant firmware storage.
Availability
AT49BV040B-JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code retention, and automotive body control module configuration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49BV040B-JU 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. The company specializes in microcontrollers, analog, Flash, and security ICs for industrial, automotive, and consumer markets.
The AT49BV040B-JU belongs to Atmel's BV-series Flash memory family, engineered for in-system reprogrammability in resource-constrained embedded systems where secure, field-upgradable firmware storage is essential.
FAQ
What is the operating voltage range of the AT49BV040B-JU?
The AT49BV040B-JU operates from a single supply of 2.7 V to 3.6 V or 4.5 V to 5.5 V. It does not support intermediate voltages (e.g., 3.7–4.4 V). This dual-range design allows direct integration into both 3.3 V and 5 V systems without level-shifting circuitry, and internal regulation ensures consistent timing and programming performance across each range. The AT49BV040B-JU also includes VCC sense circuitry that inhibits programming if supply drops below ~1.8 V.
How does the boot sector lockout feature work on the AT49BV040B-JU?
The AT49BV040B-JU provides hardware-enforced boot sector lockout for its 16 KB region (00000H–03FFFH) via a six-cycle command sequence (555H/AAH → AAAH/55H → 555H/80H → 555H/AAH → AAAH/55H → 555H/40H). Once enabled, the boot sector becomes permanently read-only - neither erasable nor programmable - while all other sectors remain fully reprogrammable. The lockout status can be verified by reading I/O0 at address 00002H in software product identification mode. This feature is unique to the AT49BV040B-JU among comparable 4 Mbit Flash devices.
What package type is used for the AT49BV040B-JU?
The AT49BV040B-JU uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated "32J" in Atmel's ordering nomenclature. It complies with JEDEC MS-016, variation AE, has a 1.27 mm lead pitch, 12.45 mm × 12.45 mm body size, and a pin 1 identifier notch at the top-left corner. This package offers superior thermal and mechanical reliability compared to TSOP/VSOP variants and is preferred for industrial applications subject to vibration or thermal cycling.
Can the AT49BV040B-JU be used as a drop-in replacement for standard EPROMs?
Yes, the AT49BV040B-JU is functionally compatible with standard 512K × 8 EPROMs in read mode: it uses identical CE/OE/WE control signals, outputs valid data within 70 ns (3.3 V) or 55 ns (5 V), and places outputs in high-impedance state when deselected. However, unlike EPROMs, it requires no UV erasure or external programming voltage - reprogramming is performed in-system via command sequences. The AT49BV040B-JU retains EPROM pinout and timing behavior while adding Flash flexibility.
What methods are available to detect completion of program or erase cycles on the AT49BV040B-JU?
The AT49BV040B-JU provides two hardware-supported methods: DATA Polling (monitoring I/O7 - returns complement of written data during programming, then true data upon completion) and Toggle Bit (monitoring I/O6 - toggles between 0 and 1 during operation, stops toggling when complete). Both methods allow the host controller to poll asynchronously without fixed delays. The AT49BV040B-JU also includes an Erase/Program Status Bit (I/O5) that indicates failure if set to "1", requiring a Product ID Exit command to recover.
AT49BV040B-JU 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:
- 120µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V, 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49BV040B-JU FAQ
1.How can I place an order for AT49BV040B-JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040B-JU 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 AT49BV040B-JU reliable?
The price and inventory of AT49BV040B-JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040B-JU is usually 5 days.
3.What payment methods are accepted for AT49BV040B-JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040B-JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040B-JU?
AT49BV040B-JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040B-JU 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 AT49BV040B-JU?
For technical support, including AT49BV040B-JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040B-JU requirements.
6.How does Aetrix verify that AT49BV040B-JU is sourced from the original manufacturer or authorized distributors?
All AT49BV040B-JU 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 AT49BV040B-JU meets industry standards.
7.What is the process for return or replacement of AT49BV040B-JU?
All AT49BV040B-JU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040B-JU, 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 AT49BV040B-JU part is unused and in its original packaging.
Return procedure for AT49BV040B-JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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