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Microchip Technology AT29LV040A-15TU-T
- Part No.:
- AT29LV040A-15TU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29LV040A-15TU-T.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
AT29LV040A-15TU-T 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 microcontroller systems. 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.
For engineers reviewing the AT29LV040A-15TU-T datasheet, AT29LV040A-15TU-T pinout, AT29LV040A-15TU-T application, or AT29LV040A-15TU-T equivalent, key selection criteria include sector-based reprogrammability, 3V-only operation without high-voltage programming pins, DATA polling/toggle-bit program status detection, and TSOP-32 packaging for space-constrained PCB layouts.
Technical Context
The AT29LV040A-15TU-T implements a sector-erase architecture where each 256-byte sector must be fully loaded before internal auto-erase-and-program execution. Programming requires a three-byte software unlock sequence (AAh/55h/A0h) followed by byte-load pulses on WE or CE, with strict 150 µs inter-byte timing.
It supports hardware and software data protection: VCC sense inhibits programming below 1.8V; OE low/CE high/WE high disables writes; noise filters reject <15 ns input glitches; and boot block lockout-activated via a seven-command sequence-permanently prevents modification of either 16KB boot region.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), organized as 2048 sectors × 256 bytes |
| Read Access Time | 150 ns - enables direct execution from flash in 8-bit bus systems up to ~6.7 MHz |
| Supply Voltage | 3.0V–3.6V - single 3.3V rail only; no 5V or 12V programming voltage required |
| Active Current | 15 mA at 5 MHz - defines power budget for active read cycles in battery-sensitive designs |
| Standby Current | 50 µA CMOS - supports ultra-low-power sleep modes in portable or energy-harvested systems |
| Sector Program Time | 20 ms max - sets minimum delay between successive sector writes in firmware update routines |
| Endurance | >10,000 write/erase cycles per sector - determines field lifetime for frequently updated configuration or logging data |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
Pinout & Package
AT29LV040A-15TU-T uses a 32-lead Thin Small Outline Package (TSOP Type I, package code 32T), 8 mm × 20 mm body, 0.5 mm pitch, JEDEC MO-142 compliant. Pin 1 identifier is marked by a notch or dot at top-left corner when viewed from top with leads down.
| 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 during load |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path; carries unlock codes, sector data, and polled status bits (I/O6 toggle, I/O7 complement) |
| 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; must be high during byte-load programming |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge; used with CE for software-controlled sector programming |
| VCC | Power Supply | +3.3V ±0.3V supply; internal VCC sense circuitry disables programming if voltage drops below ~1.8V |
| GND | Ground | Reference for all inputs/outputs; decoupling capacitor placement critical for stable 150 ns read timing |
| NC | No Connect | Pin 9 in TSOP layout - must remain unconnected; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before every sector program - prevents accidental firmware corruption during debug or power transients |
| Boot Block Lockout | Two independent 16KB regions (lowest and highest addresses) can be permanently write-protected - secures bootloader code against overwrite in field-upgradeable systems |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide real-time, bus-compatible program status feedback - eliminates need for fixed delays or external timers in host firmware |
| Single-Cycle Sector Erase/Program | Entire 256-byte sector erased and rewritten in one internal operation - simplifies firmware logic versus page-by-page or full-chip erase models |
| Green Packaging | Pb/Halide-free TSOP-32 - meets RoHS Directive 2011/65/EU and facilitates compliance in consumer and industrial end products |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Retention |
|---|---|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory automation environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage device providing direct XIP (execute-in-place) capability via 8-bit parallel bus; 150 ns access supports deterministic scan-cycle timing. Use Value: Sector-level reprogrammability allows field updates without removing the module; 10,000-cycle endurance ensures >10 years of daily firmware patching at one sector per day. | Use Scenario: Holding certified bootloader and safety-critical initialization routines in portable diagnostic equipment requiring regulatory traceability and tamper resistance. IC Role / Device Role / Timing Role: Secure boot memory with hardware-enforced lockout of first/last 16KB blocks - prevents unauthorized modification of startup code during service or upgrade. Use Value: Independent boot block lockout enables dual-firmware schemes (e.g., primary + fallback image); green packaging satisfies IEC 60601-1 environmental requirements. |
| Automotive Body Control Module | Network Router Configuration Storage |
Use Scenario: Storing vehicle-specific configuration parameters (e.g., door lock logic, lighting profiles) in BCMs operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Parameter EEPROM replacement offering faster read speed and higher density than legacy serial EEPROMs; interfaced via standard 8-bit microcontroller bus. Use Value: 50 µA standby current minimizes parasitic drain on vehicle battery during ignition-off periods; TSOP-32 footprint fits tight under-hood PCB layouts. | Use Scenario: Maintaining routing tables, VLAN settings, and security keys in enterprise-grade wired/wireless routers requiring frequent configuration changes. IC Role / Device Role / Timing Role: Configurable nonvolatile storage accessed by MIPS/ARM SoC via parallel interface; DATA polling enables concurrent CPU operation during firmware save operations. Use Value: 20 ms sector program time allows sub-second config commits; software chip erase (6-byte command) supports secure remote wipe during decommissioning. |
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 access, 3.0–3.6V, PLCC-32 only - faster read but no boot block lockout | Lacks independent boot block protection; requires external logic or firmware for bootloader security | Choose when raw read speed >150 ns is critical and boot security is handled elsewhere |
| MX29LV040CTTI-12G | 4 Mbit, 120 ns access, 2.7–3.6V, TSOP-32 - wider VCC range, no sector lockout feature | Supports lower 2.7V operation but omits boot block lockout and software chip erase | Prefer for battery-powered systems needing 2.7V brownout tolerance, accepting reduced security features |
Compared with SST39VF040-70-4C-NHE and MX29LV040CTTI-12G, the AT29LV040A-15TU-T uniquely delivers verified boot block lockout, software chip erase, and 150 ns timing in a RoHS-compliant TSOP-32 package - making it optimal for safety-aware, field-upgradable embedded systems where firmware integrity is mandatory.
Availability
AT29LV040A-15TU-T is available at Aetrix Electronics and suitable for industrial control, medical diagnostics, automotive body electronics, and network infrastructure requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT29LV040A-15TU-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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel Flash memory products including the AT29LV040A series.
The AT29LV040A product line was designed for cost-sensitive, space-constrained embedded systems requiring reliable in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the maximum operating temperature range for the AT29LV040A-15TU-T?
The AT29LV040A-15TU-T is rated for industrial temperature operation from −40°C to +85°C. This range is validated per the manufacturer's DC and AC specifications and applies to all guaranteed timing parameters including the 150 ns read access time and 20 ms sector program cycle. Operation outside this range may result in undefined behavior or accelerated wear.
Does the AT29LV040A-15TU-T require external high-voltage programming signals?
No, the AT29LV040A-15TU-T operates exclusively from a 3.0V–3.6V supply and requires no external high-voltage programming signals. All programming-including sector erase and byte load-is initiated using standard 3.3V logic levels and a three-byte software unlock sequence (5555h/2AAAh/5555h). The internal charge pump generates necessary voltages, eliminating need for 12V VPP pins.
How does the boot block lockout feature work on the AT29LV040A-15TU-T?
The AT29LV040A-15TU-T contains two 16KB boot blocks-one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Lockout is enabled independently per block via a seven-command software sequence. Once activated, that block becomes permanently read-only: no erase, program, or chip-erase commands affect it. Lockout status is readable via software identification mode at addresses 0x00002 (lower) and 0x7FFF2 (upper).
Can the AT29LV040A-15TU-T be used in a 5V system interface?
The AT29LV040A-15TU-T supports mixed-voltage interfacing: address and control inputs (A0–A18, CE, OE, WE) tolerate 0–5.5V when VCC = 3.3V ±10%, enabling direct connection to 5V microcontrollers without level shifters. However, I/O0–I/O7 pins are strictly 0–3.6V tolerant - connecting them to 5V buses will cause damage. External level translation is required for bidirectional 5V data paths.
What methods are available to detect completion of a program cycle on the AT29LV040A-15TU-T?
The AT29LV040A-15TU-T provides two hardware-supported methods: DATA polling (monitoring I/O7 - it returns complement of loaded data until completion, then true data) and Toggle Bit (monitoring I/O6 - it toggles between 0 and 1 during programming, then stabilizes). Both methods allow the host processor to poll asynchronously without fixed delays, enabling efficient use of CPU cycles during sector writes.
AT29LV040A-15TU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- 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-TSOP
AT29LV040A-15TU-T FAQ
1.How can I place an order for AT29LV040A-15TU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV040A-15TU-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-15TU-T reliable?
The price and inventory of AT29LV040A-15TU-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-15TU-T is usually 5 days.
3.What payment methods are accepted for AT29LV040A-15TU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV040A-15TU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV040A-15TU-T?
AT29LV040A-15TU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV040A-15TU-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-15TU-T?
For technical support, including AT29LV040A-15TU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV040A-15TU-T requirements.
6.How does Aetrix verify that AT29LV040A-15TU-T is sourced from the original manufacturer or authorized distributors?
All AT29LV040A-15TU-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-15TU-T meets industry standards.
7.What is the process for return or replacement of AT29LV040A-15TU-T?
All AT29LV040A-15TU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV040A-15TU-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-15TU-T part is unused and in its original packaging.
Return procedure for AT29LV040A-15TU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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