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Microchip Technology AT29C040A-15TC
- Part No.:
- AT29C040A-15TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C040A-15TC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,761
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Product details
Overview
AT29C040A-15TC from Atmel is a 4-megabit (512K × 8) 5-volt-only Flash memory IC organized as 524,288 words by 8 bits, featuring 256-byte sector architecture, 150 ns read access time, and CMOS/TTL-compatible I/O for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT29C040A-15TC datasheet, AT29C040A-15TC pinout, AT29C040A-15TC application, or AT29C040A-15TC equivalent, this page delivers verified timing specs, sector-program control logic, boot-block lockout behavior, hardware/software data protection mechanisms, and real-world use cases in industrial controller firmware and legacy BIOS storage.
Technical Context
The AT29C040A-15TC implements a sector-based reprogramming architecture where each 256-byte sector is erased and programmed in a single internal cycle using latched address/data buffers; it supports both WE- and CE-controlled byte loading with strict 150 µs inter-byte timing constraints.
Its dual boot-block lockout (two independent 16K-byte regions), software data protection (3-byte unlock sequence), and hardware safeguards-including VCC sense (<3.8 V inhibit), 5 ms power-on delay, and noise filtering on WE/CE-enable robust in-system firmware updates without high-voltage programming circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), sufficient for full firmware images in 8-bit/16-bit MCU systems |
| Read Access Time | 150 ns max - defines minimum bus cycle time for CPU read operations |
| Sector Size | 256 bytes - enables fine-grained firmware patching without erasing entire device |
| Program Cycle Time | 10 ms per sector - sets worst-case update latency for field firmware upgrades |
| VCC Supply | 5 V ± 10% - eliminates need for dedicated programming voltage rails |
| Endurance | >10,000 program/erase cycles per sector - supports long-term field maintenance |
| Standby Current | 100 µA (CMOS) - enables low-power retention in battery-backed systems |
Pinout & Package
AT29C040A-15TC is packaged in a 32-lead Thin Small Outline Package (TSOP, Type 1, package code 32T), measuring 20.0 mm × 8.0 mm × 1.2 mm, with gull-wing leads and JEDEC MO-142 BD compliance.
| 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 sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read data output or program data input; TTL/CMOS compatible |
| CE | Chip Enable | Active-low chip select; must be low for read or program; high disables outputs to high-Z |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low control for byte load and sector program initiation; participates in software unlock sequences |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O drivers; enables internal VCC-sense protection |
| GND | Ground Reference | Signal and power return path; required for valid logic thresholds and current measurement |
| NC | No Connect | Unbonded pin; must remain floating - no external connection permitted |
Key Features
| Feature | Design Value |
|---|---|
| Two Independent Boot Blocks | 16K-byte lower and upper blocks with programmable lockout - secures bootloader code against accidental overwrite |
| Hardware Data Protection | VCC sense, 5 ms power-on delay, and 15 ns noise filtering on WE/CE - prevents spurious writes during power transients |
| Software Data Protection | 3-byte unlock sequence (AAh/55h/A0h) required before any sector program - enforces controlled firmware update policy |
| Data Polling & Toggle Bit | I/O7 complement polling and I/O6 toggling provide real-time program completion detection without external timers |
| Single-Cycle Sector Erase/Program | Internal erase-and-program automation eliminates external timing control - simplifies host firmware implementation |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Retention |
|---|---|
Use Scenario: Storing configuration and control logic firmware in programmable logic controllers deployed in factory automation environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile firmware repository accessed via 8-bit parallel bus; 150 ns read timing aligns with 8051/80C188 CPU bus cycles. Use Value: Sector-level reprogrammability allows field updates of individual control modules without full flash erase, reducing downtime. | Use Scenario: Holding BIOS initialization code and hardware configuration tables in desktop motherboards prior to transition to SPI Flash. IC Role / Device Role / Timing Role: EPROM-replacement boot memory mapped at 0x00000–0x7FFFF; boot-block lockout protects reset vector and POST routines. Use Value: Dual 16K boot blocks enable fail-safe dual-image BIOS schemes - one active, one reserved for recovery. |
| Embedded Instrument Calibration Data | Telecom Line Card Configuration |
Use Scenario: Storing sensor calibration coefficients and linearization tables in portable test equipment requiring recalibration every 6–12 months. IC Role / Device Role / Timing Role: Read-mostly storage with infrequent sector rewrites; software data protection prevents accidental coefficient corruption. Use Value: >10,000 endurance cycles support lifetime recalibration needs; 100 µA standby current extends battery life in portable units. | Use Scenario: Holding FPGA configuration bitstreams and line protocol parameters in carrier-grade DSLAM line cards operating continuously at 85°C. IC Role / Device Role / Timing Role: Firmware and parameter store interfaced to local microcontroller; industrial temp grade (-40°C to +85°C) ensures reliability. Use Value: Hardware VCC-sense and noise filtering prevent bit flips during AC line disturbances common in telecom central offices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-150EC | 4 Mbit, 150 ns access, 3.0 V core with 5 V I/O tolerance; requires VPP = 12 V for sector erase | Not 5 V–only; incompatible with AT29C040A-15TC's single-supply programming | Select only if system already provides 12 V programming rail and requires lower active current |
| MX29LV040CTTI-15G | 4 Mbit, 150 ns access, 3.0 V operation; no 5 V compatibility; uses different unlock sequence (AAh/55h/80h) | Requires voltage translation and revised firmware unlock logic; no boot-block lockout feature | Choose when migrating to 3 V systems and redesigning power architecture and software drivers |
Compared with AM29LV040B-150EC and MX29LV040CTTI-15G, the AT29C040A-15TC uniquely supports true 5 V–only in-system programming without high-voltage rails or level shifters, retains boot-block lockout for secure bootloader storage, and maintains identical pinout and command set across Atmel's 5 V Flash family - enabling drop-in replacement within same-package variants.
Availability
AT29C040A-15TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS retention, embedded instrument calibration data, and telecom line card configuration requiring stable component supply across extended temperature ranges.
Supply support for AT29C040A-15TC 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, with design centers across the US, Europe, and Asia.
The AT29C040A-15TC belongs to Atmel's 5-volt-only Flash memory product line, engineered for seamless EPROM replacement in legacy 8-bit and 16-bit embedded systems requiring in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the maximum operating temperature range for the AT29C040A-15TC?
The AT29C040A-15TC is rated for industrial operation from –40°C to +85°C, as confirmed by the Ordering Information table in the official Atmel datasheet (Rev. 0333I–FLASH–05/02). This makes the AT29C040A-15TC suitable for deployment in harsh environments such as factory floors, outdoor telecom cabinets, and automotive under-hood control modules where thermal stability is critical.
Does the AT29C040A-15TC require a high-voltage programming signal like older EPROMs?
No, the AT29C040A-15TC does not require high-voltage programming signals. It operates with a single 5 V ±10% supply for both read and program operations. Programming is initiated using standard 5 V logic levels and a defined 3-byte software unlock sequence (AAh/55h/A0h), eliminating the need for external VPP generators - a key distinction from UV-erasable EPROMs and some 3 V Flash devices.
How does the boot block lockout feature work on the AT29C040A-15TC?
The AT29C040A-15TC contains two independent 16K-byte boot blocks - one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Each can be permanently locked via a 7-byte software algorithm (AAh/55h/80h/AAh/55h/40h/00h for lower block). Once enabled, that block becomes read-only; the AT29C040A-15TC will ignore all program/erase commands targeting locked sectors.
Can the AT29C040A-15TC be used as a direct replacement for the AT29C040A-15PC (PDIP version)?
Yes, the AT29C040A-15TC is functionally and electrically identical to the AT29C040A-15PC, sharing the same 32-pin TSOP and PDIP footprints in terms of pin assignment, timing, and command set. However, mechanical compatibility requires PCB layout adaptation: the AT29C040A-15TC uses a surface-mount TSOP package (32T), while the AT29C040A-15PC uses through-hole PDIP (32P6); no solder-mask or footprint changes are needed beyond pad geometry.
What methods does the AT29C040A-15TC provide to detect program completion?
The AT29C040A-15TC offers two hardware-supported methods: DATA polling (monitoring complement state of I/O7 during program cycle) and Toggle Bit detection (observing toggling on I/O6 until completion). Both methods allow the host microcontroller to poll asynchronously without fixed delays - critical for deterministic firmware update routines in real-time systems using the AT29C040A-15TC.
AT29C040A-15TC 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:
- 10ms
- Access Time:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT29C040A-15TC FAQ
1.How can I place an order for AT29C040A-15TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-15TC 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 AT29C040A-15TC reliable?
The price and inventory of AT29C040A-15TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-15TC is usually 5 days.
3.What payment methods are accepted for AT29C040A-15TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-15TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-15TC?
AT29C040A-15TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-15TC 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 AT29C040A-15TC?
For technical support, including AT29C040A-15TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-15TC requirements.
6.How does Aetrix verify that AT29C040A-15TC is sourced from the original manufacturer or authorized distributors?
All AT29C040A-15TC 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 AT29C040A-15TC meets industry standards.
7.What is the process for return or replacement of AT29C040A-15TC?
All AT29C040A-15TC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-15TC, 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 AT29C040A-15TC part is unused and in its original packaging.
Return procedure for AT29C040A-15TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29C040A-15TC Tags
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