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Microchip Technology AT29LV040A-15JU-T
- Part No.:
- AT29LV040A-15JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29LV040A-15JU-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
AT29LV040A-15JU-T from Atmel is a 4-Mbit (512K × 8) 3.3V-only Flash memory IC used for nonvolatile code/data storage in embedded boot and firmware applications. It features 150 ns read access time, 2048 × 256-byte sectors, software-controlled sector erase/program, and dual 16KB boot blocks with independent programming lockout. Designed for industrial temperature range (−40°C to +85°C), it operates in standard parallel memory interface configurations.
For engineers reviewing the AT29LV040A-15JU-T datasheet, AT29LV040A-15JU-T pinout, AT29LV040A-15JU-T application, or AT29LV040A-15JU-T equivalent, key selection criteria include sector-based reprogrammability, 3V-only operation without high-voltage programming pins, DATA polling and toggle-bit program status detection, and boot-block lockout for secure firmware startup code protection.
Technical Context
The AT29LV040A-15JU-T implements a sector-erase architecture where each of 2048 sectors (256 bytes) is erased and programmed independently via software command sequences. Programming requires no external high voltage - only 3.3V ±0.3V supply and three-byte unlock sequences (e.g., AAh/55h/A0h) before byte loading.
It supports standard parallel bus timing with CE/OE/WE control logic, TTL/CMOS-compatible I/Os, and hardware safeguards 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 algorithm and disables chip erase once activated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 512K words × 8 bits |
| Read Access Time | 150 ns - enables direct execution from flash in 5 MHz–10 MHz microcontroller systems |
| Supply Voltage | 3.3V ±0.3V - single-supply operation eliminates need for 5V or 12V programming rails |
| Active Current | 15 mA at 5 MHz - low active power supports battery-backed or energy-constrained designs |
| Standby Current | 50 µA CMOS standby - suitable for always-on firmware storage with minimal quiescent draw |
| Sector Size | 256 bytes - fine-grained update capability minimizes data reload during field firmware patches |
| Endurance | >10,000 write/erase cycles per sector - validated for frequent OTA or diagnostic log updates |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded control and automotive body electronics |
Pinout & Package
AT29LV040A-15JU-T is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 variant AE, with 1.27 mm pitch and 12.45 mm × 14.95 mm footprint. Pin 1 identifier is a corner notch.
| 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 data path for read/write; supports DATA polling on I/O7 and toggle-bit detection on I/O6 |
| CE | Chip Enable | Active-low chip select; must be stable before address setup; inhibits programming when high |
| OE | Output Enable | Active-low output control; places I/Os in high-Z when high; required high during WE-controlled programming |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge; initiates byte load when CE is low |
| NC | No Connect | Pin 19 (PLCC top view) - unconnected; must not be tied to any voltage or signal |
| VCC | Power Supply | +3.3V ±0.3V main supply; powers core logic and I/O buffers; VCC sense circuitry monitors for safe programming |
| GND | Ground | Reference return for all signals and power; decoupling capacitor required near VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (AAh/55h/A0h) prevents accidental writes - critical for field-upgradable firmware integrity |
| Boot Block Lockout | Two independent 16KB blocks (lowest/highest addresses) can be permanently locked against erase/program - secures bootloader code |
| DATA Polling & Toggle Bit | I/O7 complement-read and I/O6 toggling provide real-time, bus-compatible program status without external timers or interrupts |
| Single-Cycle Sector Program | Internal erase + program completes automatically after 256-byte load - simplifies host firmware and reduces CPU overhead |
| Green Packaging | Pb/Halide-free PLCC package complies with RoHS Directive 2011/65/EU and JEDEC standards |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing configuration parameters and control logic in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage device with sector-level update capability and industrial temperature tolerance. Use Value: Enables field firmware patching without replacing hardware; boot block lockout preserves core runtime code during updates. | Use Scenario: Holding boot code and calibration data in vehicle door modules, lighting controllers, or seat position memory systems. IC Role / Device Role / Timing Role: Secure, low-power flash memory for safety-critical startup routines and EEPROM-like parameter retention. Use Value: Dual boot blocks allow fail-safe fallback execution; 50 µA standby current extends battery life in always-connected modules. |
| Medical Diagnostic Equipment | Networking Edge Device Bootloader |
Use Scenario: Storing FDA-compliant firmware images and device-specific calibration constants in portable ultrasound or infusion pump controllers. IC Role / Device Role / Timing Role: Certified-reliable code storage with >10,000 endurance cycles for regulatory-mandated revision tracking. Use Value: Sector granularity allows versioned firmware rollback; software lockout prevents unauthorized modification of safety-critical boot code. | Use Scenario: Hosting primary bootloader and recovery image in industrial Ethernet switches or wireless access points. IC Role / Device Role / Timing Role: Parallel-interface flash memory mapped into CPU address space for XIP (execute-in-place) boot initialization. Use Value: 150 ns access time enables fast boot sequence; 3.3V-only operation simplifies power design versus legacy 5V flash alternatives. |
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, 3.3V-only, 512K × 8, same PLCC-32 package but different command set and no boot block lockout | Lacks dedicated boot block protection; uses different unlock sequence (5555h/2AAAh/AAh); no hardware lockout feature | Choose when faster read speed is prioritized over secure boot partitioning; verify compatibility with existing software drivers. |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns access, 3.3V-only, 512K × 8, TSOP-48 package; includes CFI-compliant command set and 16KB boot sectors | Different pinout (48-pin TSOP), wider voltage tolerance (2.7V–3.6V), and CFI identification - requires PCB redesign | Select for CFI-based auto-detection systems or higher-speed read requirements; not drop-in compatible due to package and pin count mismatch. |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT29LV040A-15JU-T offers verified boot block lockout and PLCC-32 pin compatibility for legacy industrial designs, while trading off raw speed for deterministic sector-program control and robust software protection - making it optimal for firmware integrity-critical, cost-sensitive, and layout-constrained applications.
Availability
AT29LV040A-15JU-T is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, medical diagnostics equipment, and networking edge devices requiring stable component supply across extended product lifecycles.
Supply support for AT29LV040A-15JU-T 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
Atmel Corporation (now part of Microchip Technology) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs for embedded systems.
The AT29LV040A-15JU-T belongs to Atmel's legacy 3.3V Flash memory product line, designed specifically for in-system reprogrammability in resource-constrained, industrial-grade applications where firmware security, long-term reliability, and simple parallel bus integration are essential.
FAQ
What is the maximum operating temperature range for the AT29LV040A-15JU-T?
The AT29LV040A-15JU-T is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" section of the official Atmel datasheet (0334H–FLASH–9/08), where it is explicitly listed under the AT29LV040A-15 ordering variant. The "-15" suffix denotes the 150 ns access time grade, and "JU" indicates the PLCC package with industrial temperature qualification. No derating or additional thermal management is required within this range.
Does the AT29LV040A-15JU-T require high-voltage programming signals?
No, the AT29LV040A-15JU-T does not require high-voltage programming signals. It operates exclusively from a 3.3V ±0.3V supply and uses software-controlled command sequences (e.g., AAh/55h/A0h) to enable programming. Hardware protections - including VCC sense below 1.8V and 10 ms power-on delay - ensure programming is inhibited unless valid 3.3V conditions are met. This eliminates the need for external 12V generators or complex voltage-switching circuitry in the host system.
How many sectors does the AT29LV040A-15JU-T have, and what is the size of each sector?
The AT29LV040A-15JU-T contains 2048 sectors, each exactly 256 bytes in size. This is specified in both the "Features" and "Description" sections of the datasheet, and confirmed by the memory organization: 4 Mbit = 524,288 bytes ÷ 256 bytes/sector = 2048 sectors. Sector boundaries align to 256-byte boundaries, and A8–A18 determine the sector address during programming, while A0–A7 select the byte within the sector.
Can the boot blocks of the AT29LV040A-15JU-T be unlocked after programming lockout is enabled?
No, the boot block programming lockout feature of the AT29LV040A-15JU-T is irreversible once enabled. The datasheet states that "once the programming lockout feature has been activated, the data in that block can no longer be erased or programmed." There is no documented command sequence, hardware reset, or voltage condition that restores write capability to a locked boot block. This one-time programmable behavior ensures firmware integrity but requires careful pre-deployment validation of boot code.
What is the purpose of the NC pin on the AT29LV040A-15JU-T PLCC package?
The NC (No Connect) pin on the AT29LV040A-15JU-T PLCC package - Pin 19 in the top-view pinout - is electrically and physically unconnected to any internal circuitry. It must remain floating and should not be tied to VCC, GND, or any signal. This pin exists for mechanical symmetry and package standardization (JEDEC MS-016 AE), not functional use. Connecting it risks unintended coupling or ESD paths, and violates the absolute maximum ratings for input voltage on NC pins (−0.6V to +6.25V).
AT29LV040A-15JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for AT29LV040A-15JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV040A-15JU-T 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-T reliable?
The price and inventory of AT29LV040A-15JU-T 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-T is usually 5 days.
3.What payment methods are accepted for AT29LV040A-15JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV040A-15JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV040A-15JU-T?
AT29LV040A-15JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV040A-15JU-T 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-T?
For technical support, including AT29LV040A-15JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV040A-15JU-T requirements.
6.How does Aetrix verify that AT29LV040A-15JU-T is sourced from the original manufacturer or authorized distributors?
All AT29LV040A-15JU-T 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-T meets industry standards.
7.What is the process for return or replacement of AT29LV040A-15JU-T?
All AT29LV040A-15JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV040A-15JU-T, 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-T part is unused and in its original packaging.
Return procedure for AT29LV040A-15JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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