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Microchip Technology AT29BV040A-20JU
- Part No.:
- AT29BV040A-20JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29BV040A-20JU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,796
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Product details
Overview
AT29BV040A-20JU from Microchip Technology (formerly Atmel) is a 4-Mbit (512K × 8) single-supply Flash memory IC used for nonvolatile code and data storage in embedded systems. It operates from 2.7V to 3.6V, delivers 200 ns read access time, supports sector-based reprogramming with 2048 × 256-byte sectors, and features dual 16K-byte boot blocks with independent programming lockout. It is commonly deployed in industrial microcontroller boot loaders and firmware update storage.
For engineers reviewing the AT29BV040A-20JU datasheet, AT29BV040A-20JU pinout, AT29BV040A-20JU application, or AT29BV040A-20JU equivalent, key selection criteria include its 200 ns read timing, software-controlled sector erase/program, CMOS standby current of 50 µA, boot block lockout capability, and PLCC-32 packaging for through-hole compatibility in legacy industrial designs.
Technical Context
The AT29BV040A-20JU implements a sector-erase Flash architecture with internal address/data latches for 256-byte loads, enabling microprocessor-speed data capture before autonomous erase-and-program execution. Its software data protection requires a three-byte command sequence (AAh→55h→A0h) to enable programming, preventing inadvertent writes during power transitions or noise events.
It supports hardware and software product identification modes (Manufacturer Code 1Fh, Device Code C4h), DATA polling on I/O7 and toggle-bit detection on I/O6 for program cycle completion, and optional chip-erase via 6-byte software command. Boot block lockout is activated by a seven-command sequence and disables chip erase when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), sufficient for full firmware images in 8-bit/16-bit MCU systems |
| Read Access Time | 200 ns - enables direct execution from Flash (XIP) in timing-critical boot sequences |
| Supply Voltage Range | 2.7V–3.6V - compatible with single Li-ion or regulated 3.3V rails without level shifters |
| Active Current | 15 mA at 5 MHz - low enough for battery-backed operation in portable industrial tools |
| Standby Current | 50 µA CMOS - supports ultra-low-power sleep modes in always-on monitoring devices |
| Endurance | 10,000 program/erase cycles per sector - suitable for field-upgradable firmware with infrequent updates |
| Sector Size | 256 bytes - matches typical bootloader partition granularity and minimizes rewrite overhead |
| Boot Blocks | Two 16K-byte blocks (low/high address) with independent lockout - secures primary and fallback boot code |
Pinout & Package
AT29BV040A-20JU is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 compliant, with 1.27 mm pitch and through-hole mounting. The package provides mechanical robustness for industrial vibration environments and thermal stability across –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 select byte within 256-byte sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for toggle-bit status during programming |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high-Z output when CE high or OE high |
| OE | Output Enable | Active-low output control; enables data output only when CE is also low and WE is high |
| WE | Write Enable | Active-low write strobe; initiates byte load during programming when CE is low and OE is high |
| VCC | Power Supply | Single 2.7–3.6V supply; powers all logic and programming circuitry - no VPP required |
| GND | Ground Reference | Common return path for all signals and power; critical for stable DATA polling and toggle-bit behavior |
| NC | No Connect | Unbonded pin; must remain unconnected to avoid signal integrity or ESD risks |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7–3.6V Supply | Eliminates need for charge pumps or external high-voltage generators - simplifies power design and reduces BOM cost |
| Software Data Protection | Three-byte unlock sequence prevents accidental writes during reset, noise, or brown-out - improves field reliability |
| Internal Program Control Timer | Automates sector erase and programming after data latch - frees CPU for other tasks during 20 ms max cycle |
| DATA Polling & Toggle Bit | Dual asynchronous status methods (I/O7 complement, I/O6 toggling) allow flexible polling without dedicated status pins |
| Boot Block Lockout | Independent 16K-byte lockout for lower and upper memory regions - protects boot code while allowing application updates |
| Green (Pb/Halide-free) Packaging | Complies with RoHS Directive 2011/65/EU - meets environmental requirements for industrial and medical equipment |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Loader |
|---|---|
Use Scenario: Storing firmware and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast 200 ns read access enabling real-time instruction fetch; boot block lockout secures startup routines against corruption. Use Value: Ensures deterministic boot behavior and field-upgradable logic programs without requiring external voltage programming sources or redesigning power delivery. | Use Scenario: Holding certified boot code and safety-critical initialization routines in portable diagnostic instruments requiring regulatory compliance and long-term data retention. IC Role / Device Role / Timing Role: Secure, lockable Flash memory providing tamper-resistant boot image storage; 10,000-cycle endurance supports periodic regulatory-mandated firmware validation updates. Use Value: Meets IEC 62304 Class B software lifecycle requirements by isolating immutable boot code from application partitions subject to change. |
| Telecom Remote Node Configuration | Automotive Diagnostic Tool Memory |
Use Scenario: Retaining node-specific calibration tables and communication protocol stacks in outdoor telecom repeaters exposed to humidity and thermal cycling. IC Role / Device Role / Timing Role: Sector-erasable Flash with 50 µA standby current minimizing battery drain during idle periods; software protection prevents misconfiguration during firmware download. Use Value: Enables remote field updates over low-bandwidth links while maintaining data integrity across 10+ year deployments without maintenance. | Use Scenario: Storing vehicle-specific diagnostic firmware and OBD-II protocol interpreters in handheld scan tools used across multiple vehicle platforms. IC Role / Device Role / Timing Role: Reconfigurable nonvolatile memory supporting multi-vehicle firmware variants; PLCC-32 package ensures mechanical reliability during frequent tool handling and ESD-prone shop environments. Use Value: Reduces inventory complexity by enabling one hardware platform to host firmware for diverse ECUs via field-loaded Flash images. |
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 access, 3.0–3.6V supply, TSOP-48 package, no boot block lockout | Lacks dedicated boot block protection; requires external software management of critical sectors | Choose when faster read speed is prioritized over secure boot isolation and PLCC mounting is not required |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns access, 3.0–3.6V, TSOP-48, top-boot configuration only, no independent dual lockout | Supports top-boot only; cannot lock bottom 16K independently - limits flexibility for dual-image boot schemes | Select for cost-sensitive consumer applications where single boot region suffices and surface-mount assembly is preferred |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT29BV040A-20JU offers unique dual independent boot block lockout in a through-hole PLCC package, making it irreplaceable for industrial designs requiring physical robustness and hardware-enforced boot code immutability - even though its 200 ns access is slower than alternatives.
Availability
AT29BV040A-20JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot loader implementation, and telecom remote node configuration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT29BV040A-20JU 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 legacy Flash product support, including datasheets, errata, and qualified sources for discontinued and mature parts.
The AT29BV040A belongs to Atmel's 2.7V-only Flash memory family, designed specifically for in-system reprogrammability in resource-constrained embedded systems without high-voltage programming infrastructure.
FAQ
What is the maximum operating temperature range for the AT29BV040A-20JU?
The AT29BV040A-20JU is rated for industrial temperature operation from –40°C to +85°C. This range is validated per its ordering code suffix "-20JU", where "I" denotes Industrial grade. Operation outside this range may result in undefined timing behavior, increased standby current, or reduced endurance - especially above 85°C where data retention degrades exponentially.
Does the AT29BV040A-20JU require an external high-voltage supply for programming?
No, the AT29BV040A-20JU does not require an external high-voltage supply. It performs all erase and program operations using only its single 2.7V–3.6V VCC supply. Programming is enabled solely through the software data protection sequence (AAh→55h→A0h), eliminating need for VPP pins or charge pumps - a core design feature of Atmel's 2.7V-only Flash family including the AT29BV040A-20JU.
How many program/erase cycles is the AT29BV040A-20JU guaranteed for?
The AT29BV040A-20JU is specified for a minimum endurance of 10,000 program/erase cycles per sector. This rating applies to any individual 256-byte sector and is verified under standard industrial conditions (VCC = 3.0V, TA = 25°C). Endurance remains valid even when boot block lockout is enabled, as locked sectors are excluded from cycling.
Can both boot blocks on the AT29BV040A-20JU be locked independently?
Yes, the AT29BV040A-20JU supports independent programming lockout for its two 16K-byte boot blocks - one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Each lockout is activated via a separate seven-command sequence, and once set, prevents erasure or programming of that specific block. Enabling either lockout disables the chip-erase function entirely.
What package type does the "JU" suffix indicate for the AT29BV040A-20JU?
"JU" denotes the 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per Atmel's ordering nomenclature. This through-hole package has a 1.27 mm lead pitch, conforms to JEDEC MS-016, and is distinct from the "TU" variant (TSOP-32). The PLCC form factor provides superior mechanical stability and thermal dissipation for industrial applications where board flexure or thermal cycling is a concern - a key differentiator for the AT29BV040A-20JU.
AT29BV040A-20JU 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:
- 20ms
- Access Time:
- 200 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)
AT29BV040A-20JU FAQ
1.How can I place an order for AT29BV040A-20JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29BV040A-20JU 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 AT29BV040A-20JU reliable?
The price and inventory of AT29BV040A-20JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29BV040A-20JU is usually 5 days.
3.What payment methods are accepted for AT29BV040A-20JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29BV040A-20JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29BV040A-20JU?
AT29BV040A-20JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29BV040A-20JU 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 AT29BV040A-20JU?
For technical support, including AT29BV040A-20JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29BV040A-20JU requirements.
6.How does Aetrix verify that AT29BV040A-20JU is sourced from the original manufacturer or authorized distributors?
All AT29BV040A-20JU 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 AT29BV040A-20JU meets industry standards.
7.What is the process for return or replacement of AT29BV040A-20JU?
All AT29BV040A-20JU units undergo pre-shipment inspection (PSI). If there is an issue with AT29BV040A-20JU, 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 AT29BV040A-20JU part is unused and in its original packaging.
Return procedure for AT29BV040A-20JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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