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Microchip Technology AT29LV040A-25TC
- Part No.:
- AT29LV040A-25TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29LV040A-25TC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT29LV040A-25TC from Atmel is a 4-Mbit (512K × 8) 3.3V-only Flash memory IC organized as 524,288 words × 8 bits, featuring 2048 independent 256-byte sectors, 150 ns read access time, and software-controlled sector erase/program with boot block lockout. It operates in commercial temperature range (0°C to 70°C) and supports in-system reprogramming without high-voltage programming signals - used in embedded firmware storage for microcontroller-based industrial controllers.
For engineers reviewing the AT29LV040A-25TC datasheet, AT29LV040A-25TC pinout, AT29LV040A-25TC application, or AT29LV040A-25TC equivalent, key selection considerations include sector-level program timing (20 ms max), CMOS/TTL-compatible I/O, DATA polling and toggle-bit end-of-program detection, and dual 16K-byte boot blocks with independent lockout enablement.
Technical Context
The AT29LV040A-25TC implements a sector-erase architecture where each 256-byte sector is erased and programmed in a single internal cycle using software command sequences (e.g., 0x5555/0x2AAA/0xA0). Address latching occurs on falling CE or WE edges, with A0–A7 selecting byte offset and A8–A18 specifying sector address.
It integrates hardware protections including VCC sense (<1.8V inhibit), 10 ms power-on delay, noise filtering (<15 ns pulse rejection), and dual-line control (CE/OE) to prevent bus contention during read. Boot block lockout is activated via a seven-command sequence and disables chip erase when enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), enabling full firmware image storage for mid-complexity 8/16-bit MCUs |
| Read Access Time | 250 ns max - defines minimum CPU wait-state requirement for zero-wait-state operation at ≤4 MHz bus clock |
| Program Cycle Time | 20 ms max per 256-byte sector - determines firmware update latency during field reprogramming |
| VCC Supply Range | 3.0 V to 3.6 V - compatible with standard 3.3V logic rails without level-shifting |
| Active Current | 15 mA typical - sets peak power budget for active read/write in battery-backed systems |
| Standby Current | 40 µA CMOS - enables low-power retention during system sleep modes |
| Endurance | >10,000 program/erase cycles per sector - supports frequent firmware updates over product lifetime |
Pinout & Package
AT29LV040A-25TC is packaged in a 32-lead Thin Small Outline Package (TSOP Type 1), compliant with JEDEC MO-142 BD, measuring 20.0 mm × 8.0 mm × 1.2 mm (L × W × H), with 0.5 mm lead pitch and gull-wing leads.
| 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 |
| 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 control; used with CE to manage bus contention and reduce read current |
| WE | Write Enable | Active-low write strobe; controls byte load timing and initiates sector programming when CE is also low |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit data path for read, program, and identification modes; TTL/CMOS compatible with 3.3V signaling |
| NC | No Connect | Unbonded pin; must remain unconnected to avoid unintended coupling or leakage paths |
| VCC | Power Supply | 3.3V ±10% supply input; requires local 0.1 µF ceramic decoupling adjacent to pin |
| GND | Ground Reference | Signal and power return; must be connected to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-command unlock sequence (0x5555/0x2AAA/0xA0) required before any sector program - prevents accidental firmware corruption during power transients |
| Dual Boot Block Lockout | Independent 16K-byte upper/lower boot blocks can be permanently locked via 7-command enable - secures bootloader code against overwrite |
| DATA Polling & Toggle Bit | I/O7 complement polling and I/O6 toggling provide real-time, bus-compatible program completion status - eliminates need for fixed delays or external timers |
| Single-Cycle Sector Erase/Program | Internal erase-and-program execution after 256-byte load - simplifies host firmware by offloading timing-critical sequencing |
| Green Pb/Halide-Free Packaging | RoHS-compliant TSOP package - meets environmental compliance requirements for industrial and consumer deployments |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Nonvolatile program memory providing direct XIP-capable read access and field-upgradable code storage via RS-485 or CAN interfaces. Use Value: 250 ns read timing enables deterministic scan-cycle execution; sector protection prevents runtime corruption of critical control logic during partial updates. | Use Scenario: Hosting secure bootloader and calibration data in portable diagnostic equipment requiring FDA-compliant firmware integrity and traceability. IC Role / Device Role / Timing Role: Trusted boot memory with independently lockable 16K lower-block storing immutable startup code verified prior to main application launch. Use Value: Boot block lockout ensures bootloader persistence across 10,000+ field updates; 40 µA standby current extends battery life between calibrations. |
| Automotive Body Control Module | Network Router Configuration Storage |
Use Scenario: Retaining vehicle-specific configuration maps and EEPROM-emulated parameter tables in body control units operating across 0°C–70°C ambient range. IC Role / Device Role / Timing Role: Emulation of serial EEPROM functionality using sector-based writes, accessed via SPI-to-parallel bridge MCU peripherals. Use Value: 2048-sector granularity allows fine-grained wear leveling; software protection avoids miswrites during ignition cycling or voltage droop events. | Use Scenario: Storing routing tables, VLAN settings, and firmware patches in enterprise-grade Ethernet switches requiring reliable configuration persistence across power cycles. IC Role / Device Role / Timing Role: Standalone parallel Flash memory interfaced to ARM-based switch controller for fast boot and hot-firmware-swap capability. Use Value: 15 mA active current aligns with switch SoC power budgets; DATA polling enables concurrent packet processing during config reloads. |
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 | 70 ns read access, 3.0–3.6V supply, same 4-Mbit density and TSOP-32 package but uses different command set and lacks boot block lockout | Higher-speed read suitable for tighter timing margins; no hardware-enforced boot protection - requires external software safeguards | Select when faster read performance is prioritized over secure bootloader isolation |
| MX29LV400CBTI-70G | 70 ns read, 3.0–3.6V, 4-Mbit, TSOP-48 package (not pin-compatible); includes CFI query support and 16K boot sectors but different sector layout (1×16K + 2×8K + 31×64K) | CFI compatibility simplifies driver portability across Flash vendors; larger top/bottom boot sectors better suited for complex bootloaders | Select when CFI-based auto-detection and broader boot sector flexibility are required in new designs |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CBTI-70G, the AT29LV040A-25TC offers deterministic 250 ns read timing with integrated boot block lockout - making it optimal for cost-sensitive, security-aware legacy embedded systems where pin compatibility and proven field reliability outweigh CFI or sub-70 ns speed needs.
Availability
AT29LV040A-25TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and automotive body control module configuration requiring stable component supply and long-term lifecycle support.
Supply support for AT29LV040A-25TC 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 semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for embedded systems.
The AT29LV040A belongs to Atmel's 3.3V-only Flash memory product line, designed specifically for in-system programmability and firmware storage in cost-sensitive industrial and consumer applications where high-voltage programming is impractical.
FAQ
What is the maximum read access time specified for the AT29LV040A-25TC?
The AT29LV040A-25TC has a maximum read access time of 250 ns, as indicated by the "-25" suffix in its part number. This value is guaranteed across the commercial temperature range (0°C to 70°C) and 3.0 V to 3.6 V supply voltage. The specification directly impacts system timing - for example, it defines the minimum wait state required when interfacing with an 8-bit microcontroller running at 4 MHz. This timing is measured from address stabilization to valid data on I/O0–I/O7 under standard load conditions (CL = 5 pF).
Does the AT29LV040A-25TC support in-system programming without external high-voltage supplies?
Yes, the AT29LV040A-25TC supports full in-system programming using only the standard 3.3V supply - no external 12V or 5V programming voltage is required. Programming is initiated via a three-byte software command sequence (0x5555 → 0x2AAA → 0xA0) followed by loading 256 bytes of data into the target sector. The device then automatically erases and programs the sector internally. This capability is central to the AT29LV040A-25TC's role in field-upgradable embedded systems where high-voltage circuitry would add cost and complexity.
How does the boot block lockout feature work on the AT29LV040A-25TC?
The AT29LV040A-25TC includes two dedicated 16K-byte boot blocks - one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Each can be independently locked using a seven-command software sequence. Once enabled, the locked block becomes permanently read-only: no erase or program operations are possible, and chip erase is disabled. Lock status is verified by reading address 0x00002 (lower block) or 0x7FFF2 (upper block); FEH means unlocked, FFH means locked. This protects bootloader code stored in the AT29LV040A-25TC from accidental overwrite.
What are the valid operating temperature ranges for the AT29LV040A-25TC?
The AT29LV040A-25TC is rated for commercial temperature operation from 0°C to 70°C, as confirmed by the "C" suffix in its ordering code and the "Commercial (0° to 70°C)" designation in Atmel's Ordering Information table. It is not rated for industrial (-40°C to +85°C) operation - that variant is designated AT29LV040A-25TI or AT29LV040A-25JI. Using the AT29LV040A-25TC outside its specified 0°C–70°C range may result in timing violations, increased standby current, or program failure, especially near extremes.
Can the AT29LV040A-25TC be used with 5V-tolerant microcontrollers?
Yes - the AT29LV040A-25TC accepts address and control inputs (A0–A18, CE, OE, WE) over 0 V to 5.5 V while powered from 3.3 V, per its "Input Levels" specification. However, I/O0–I/O7 pins are limited to 0 V to 3.6 V and must not be driven above VCC + 0.6 V. Therefore, when interfacing with 5V microcontrollers, level translation is required on the data bus, but not on address/control lines. This mixed-voltage tolerance simplifies integration into legacy 5V systems upgrading to 3.3V Flash, provided data-path level shifters are used for the AT29LV040A-25TC's bidirectional I/O lines.
AT29LV040A-25TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- 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:
- 250 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29LV040A-25TC FAQ
1.How can I place an order for AT29LV040A-25TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV040A-25TC 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-25TC reliable?
The price and inventory of AT29LV040A-25TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV040A-25TC is usually 5 days.
3.What payment methods are accepted for AT29LV040A-25TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV040A-25TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV040A-25TC?
AT29LV040A-25TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV040A-25TC 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-25TC?
For technical support, including AT29LV040A-25TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV040A-25TC requirements.
6.How does Aetrix verify that AT29LV040A-25TC is sourced from the original manufacturer or authorized distributors?
All AT29LV040A-25TC 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-25TC meets industry standards.
7.What is the process for return or replacement of AT29LV040A-25TC?
All AT29LV040A-25TC units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV040A-25TC, 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-25TC part is unused and in its original packaging.
Return procedure for AT29LV040A-25TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29LV040A-25TC Tags
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