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Microchip Technology AT29LV040A-15JU
- Part No.:
- AT29LV040A-15JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV040A-15JU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,902
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Product details
Overview
AT29LV040A-15JU from Microchip Technology (formerly Atmel) is a 4-Mbit (512K × 8) 3.3V-only Flash memory IC used for nonvolatile code and data storage in embedded systems. It features 150 ns read access time, 2048 independent 256-byte sectors, software-controlled sector erase/program, and dual 16K-byte boot blocks with programmable lockout - deployed in industrial microcontroller boot loaders and firmware update storage.
For engineers reviewing the AT29LV040A-15JU datasheet, AT29LV040A-15JU pinout, AT29LV040A-15JU application, or AT29LV040A-15JU equivalent, key selection criteria include sector-based reprogrammability, 3V-only operation without high-voltage programming pins, DATA polling/toggle-bit program status detection, and PLCC-32 packaging for through-hole prototyping and legacy industrial PCBs.
Technical Context
The AT29LV040A-15JU implements a sector-erase architecture where each of its 2048 sectors (256 bytes) is independently erasable and programmable via three-byte software command sequences. Programming requires no external VPP voltage - all operations execute using only VCC = 3.3V ±0.3V.
It supports standard parallel interface timing with CE/OE/WE control logic, TTL/CMOS-compatible I/O levels, and hardware protections including VCC sense (<1.8V inhibit), 10 ms power-on delay, and noise filtering on WE/CE inputs. Boot block lockout is enabled via a seven-command sequence targeting addresses 00000H and FFFFFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits - fits full firmware images for 8-bit/16-bit MCUs. |
| Read Access Time | 150 ns max - enables direct execution (XIP) from flash in timing-critical boot code paths. |
| Supply Voltage | 3.3V ±0.3V - eliminates need for dedicated programming voltage rails or level shifters. |
| Active Current | 15 mA max at 5 MHz - supports low-power operation in battery-backed or energy-constrained systems. |
| Standby Current | 50 µA CMOS standby - maintains data retention while minimizing quiescent power draw. |
| Sector Size | 256 bytes per sector - allows fine-grained firmware updates without erasing entire device. |
| Endurance | >10,000 program/erase cycles per sector - suitable for field-upgradable applications with moderate update frequency. |
Pinout & Package
AT29LV040A-15JU uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, compliant with JEDEC MS-016 Variation AE, with 1.27 mm pitch and body size 12.57 mm × 15.11 mm. Pin 1 identifier is a corner notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 524,288-word addressing; A0–A7 select byte within 256-byte sector. |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high forces outputs to high-Z and enables CMOS standby mode. |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention during reads; high disables outputs. |
| WE | Write Enable | Active-low write strobe; initiates byte load during sector programming; must be high during reads. |
| I/O0–I/O7 | Data Bus | Bidirectional 8-bit data path; latches input data on rising edge of CE or WE; outputs valid after tOE delay. |
| NC | No Connect | Pin 29 (PLCC top view) is unconnected - no internal bonding; must remain floating or grounded per layout guidelines. |
| VCC | Power Supply | 3.3V ±0.3V main supply; internal VCC sense circuitry inhibits programming if below 1.8V. |
| GND | Ground | Reference return for all signals and power; decoupling capacitor required within 10 mm of VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (AAh/55h/A0h) required before any sector programming - prevents accidental writes during power transients or noise events. |
| Boot Block Lockout | Two independent 16K-byte blocks (lowest and highest addresses) can be permanently locked against erase/program - secures bootloader code from corruption. |
| DATA Polling & Toggle Bit | I/O7 complement indicates active programming; I/O6 toggling provides alternate end-of-cycle detection - eliminates need for fixed delays or external timers. |
| Single-Cycle Sector Erase/Program | Entire 256-byte sector erased and programmed in ≤20 ms - simplifies firmware update routines and reduces system downtime. |
| Green Packaging | Pb/Halide-free PLCC-32 construction - meets RoHS Directive 2011/65/EU and facilitates compliance in industrial and medical designs. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast 150 ns read access enabling deterministic boot timing and real-time task initialization. Use Value: Sector-level reprogrammability allows field updates without replacing hardware; 50 µA standby current extends uptime in battery-buffered backup modes. | Use Scenario: Holding certified bootloader code and calibration data in Class II medical instruments requiring traceable, tamper-resistant firmware storage. IC Role / Device Role / Timing Role: Secure boot memory with lockout-enabled 16K-byte lower-address block preventing unauthorized modification of startup routines. Use Value: Software lockout activation ensures bootloader integrity across device lifecycle; >10,000 endurance cycles support regulatory-mandated recalibration intervals. |
| Automotive Diagnostic Tool Memory | Legacy Industrial HMI Code Storage |
Use Scenario: Embedded diagnostic tools used in vehicle service bays, exposed to automotive-grade temperature ranges and transient voltage spikes. IC Role / Device Role / Timing Role: Firmware repository supporting OBD-II protocol stacks and vehicle-specific calibration tables accessed via microcontroller parallel bus. Use Value: 3.3V-only operation eliminates level-shifting complexity; hardware VCC-sense and noise filtering ensure robustness against ignition noise and load-dump events. | Use Scenario: Human-machine interface panels in manufacturing equipment where long-term component availability and through-hole assembly are mandatory. IC Role / Device Role / Timing Role: Code storage for 8051- or Z80-based controllers interfacing with discrete logic and analog front-ends via parallel bus. Use Value: PLCC-32 package enables reliable hand-soldering and socket-based replacement; sector architecture supports modular UI language pack updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF040-70-4C-NHE | 4 Mbit, 70 ns read access, 3.3V operation, TSOP-32 package - faster read but no boot block lockout. | Lacks dedicated boot block protection; requires external software management of critical firmware regions. | Choose when higher read speed is prioritized over secure bootloader isolation. |
| MX29LV040CTTI-12 | 4 Mbit, 120 ns read access, 3.3V operation, PLCC-32 package - same footprint but no hardware boot lockout enable. | Relies solely on software write-protection; no hardware-enforced sector locking mechanism. | Prefer for cost-sensitive replacements where boot security is managed at application layer. |
Compared with SST39VF040-70-4C-NHE and MX29LV040CTTI-12, the AT29LV040A-15JU uniquely integrates hardware-activated boot block lockout and 150 ns read timing in a PLCC-32 package - delivering both physical security and legacy board compatibility where firmware integrity and through-hole assembly are design requirements.
Availability
AT29LV040A-15JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and legacy industrial HMI code storage requiring stable component supply and long-lifecycle support.
Supply support for AT29LV040A-15JU 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 AT29LV040A series.
The AT29LV040A product line was designed for cost-effective, in-system reprogrammable nonvolatile storage in 8-bit and 16-bit microcontroller-based systems requiring 3.3V-only operation and sector-level firmware updates.
FAQ
What is the operating temperature range for the AT29LV040A-15JU?
The AT29LV040A-15JU is rated for industrial temperature operation from –40°C to +85°C. This range is validated per the manufacturer's DC and AC operating specifications and applies to all functional modes including read, program, and standby. The PLCC-32 package's thermal characteristics support reliable operation across this full range without derating.
Does the AT29LV040A-15JU require a high-voltage programming signal?
No, the AT29LV040A-15JU does not require high-voltage programming. It operates exclusively from a 3.3V ±0.3V supply and uses software command sequences (e.g., AAh/55h/A0h) to initiate sector programming. Internal charge pumps generate necessary voltages, eliminating external VPP pins or level shifters - a key feature confirmed in the device description and programming algorithm sections.
How is program completion detected on the AT29LV040A-15JU?
Program completion on the AT29LV040A-15JU is detected using either DATA polling (monitoring I/O7 for complement-to-data transition) or the toggle bit method (observing I/O6 toggling state). Both methods are fully supported per the datasheet and require no external hardware - the AT29LV040A-15JU asserts valid data on all I/O lines once programming completes.
Can the boot blocks of the AT29LV040A-15JU be unlocked after lockout is enabled?
No, the boot block lockout feature on the AT29LV040A-15JU is irreversible once activated. The seven-command enable sequence permanently disables erase and program operations for the selected 16K-byte block(s). This one-time hardware enforcement is explicitly documented in Section 4.9 and verified in the Boot Block Lockout Feature Enable Algorithm.
Is the AT29LV040A-15JU pin-compatible with other 4-Mbit Flash devices in PLCC-32?
The AT29LV040A-15JU has a standard parallel Flash pinout (A0–A18, CE, OE, WE, I/O0–I/O7, VCC, GND, NC) consistent with JEDEC-compliant 4-Mbit devices, but it is not guaranteed pin-compatible with non-Atmel derivatives due to differences in command sets, timing, and lockout behavior. Direct substitution requires validation of software command flow and timing margins - the AT29LV040A-15JU's unique boot lockout and sector programming model necessitates firmware-level verification.
AT29LV040A-15JU 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:
- 150 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29LV040A-15JU FAQ
1.How can I place an order for AT29LV040A-15JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV040A-15JU 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 AT29LV040A-15JU reliable?
The price and inventory of AT29LV040A-15JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV040A-15JU is usually 5 days.
3.What payment methods are accepted for AT29LV040A-15JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV040A-15JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV040A-15JU?
AT29LV040A-15JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV040A-15JU 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 AT29LV040A-15JU?
For technical support, including AT29LV040A-15JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV040A-15JU requirements.
6.How does Aetrix verify that AT29LV040A-15JU is sourced from the original manufacturer or authorized distributors?
All AT29LV040A-15JU 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 AT29LV040A-15JU meets industry standards.
7.What is the process for return or replacement of AT29LV040A-15JU?
All AT29LV040A-15JU units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV040A-15JU, 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 AT29LV040A-15JU part is unused and in its original packaging.
Return procedure for AT29LV040A-15JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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