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Microchip Technology AT29C040A-12TC
- Part No.:
- AT29C040A-12TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT29C040A-12TC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,769
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Product details
Overview
AT29C040A-12TC 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, 120 ns read access time, hardware/software data protection, and two 16K-byte boot blocks with independent lockout - used in embedded firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the AT29C040A-12TC datasheet, AT29C040A-12TC pinout, AT29C040A-12TC application, or AT29C040A-12TC equivalent, key selection considerations include sector-program compatibility, 5V-only reprogramming without high-voltage support, boot block lockout behavior, and TSOP-32 package constraints for space-constrained PCB layouts.
Technical Context
The AT29C040A-12TC implements a sector-based Flash architecture where each of 2048 sectors (256 bytes/sector) is erased and programmed independently using internal address/data latches and an autonomous control timer. Programming requires no external high voltage - only standard 5V ±10% supply and valid WE/CE/OE timing sequences.
It supports dual data validation methods: DATA polling on I/O7 (complement-to-data during programming) and TOGGLE BIT detection on I/O6, enabling robust end-of-program detection without dedicated status pins. Boot block lockout is implemented via a 7-command software algorithm targeting addresses 00000H (lower) and 7FFFFH (upper), disabling chip erase if either is activated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8), sufficient for full firmware images in legacy microcontroller systems |
| Read Access Time | 120 ns - defines maximum sustained read throughput in CPU bus interfaces |
| Sector Size | 256 bytes - enables fine-grained firmware updates without erasing entire device |
| Program Cycle Time | 10 ms per sector - sets minimum latency for field firmware patching operations |
| Endurance | >10,000 write/erase cycles per sector - supports long-term field update capability |
| Supply Voltage | 5 V ±10% - eliminates need for auxiliary voltage rails in 5V system designs |
| Standby Current | 100 µA (CMOS) - enables low-power retention in battery-backed applications |
Pinout & Package
AT29C040A-12TC is supplied in a 32-lead Thin Small Outline Package (TSOP Type 1), 8 mm × 20 mm body, 0.5 mm pitch, JEDEC MO-142 BD compliant, with gull-wing leads and pin 1 identifier 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 sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for TOGGLE BIT status monitoring |
| CE | Chip Enable | Active-low chip select; must be low for read/program; high disables outputs to high-Z state |
| OE | Output Enable | Active-low output gate; controls data assertion on I/O lines during read cycles only |
| WE | Write Enable | Active-low control for byte load and program initiation; timing-critical for 150 µs inter-byte loading window |
| VCC | Power Supply | +5 V ±10% main supply; powers all logic and programming circuitry |
| GND | Ground Reference | Signal and power return path; required for stable operation and noise immunity |
| NC | No Connect | Unbonded pin; must remain unconnected per datasheet to avoid functional interference |
Key Features
| Feature | Design Value |
|---|---|
| 5V-only sector programming | Eliminates need for +12V programming supplies, simplifying power design and enabling in-system reprogramming via standard logic-level signals |
| Hardware data protection | VCC sense (<3.8V inhibits programming), 5 ms power-on delay, and noise filtering (<15 ns pulses ignored) prevent accidental writes during power transitions |
| Software data protection | Three-command sequence (AAh/55h/A0h) enables/disables write access globally - persists across power cycles and protects all sectors |
| Boot block lockout | Independent 16K-byte lockout for lower (0x00000–0x03FFF) and upper (0x7C000–0x7FFFF) regions - secures bootloader code against overwrite |
| DATA polling & TOGGLE BIT | Dual asynchronous status reporting: I/O7 complement indicates programming progress; I/O6 toggling provides alternative polling channel without data dependency |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Modules |
|---|---|
Use Scenario: Storing configuration logic and runtime firmware in programmable logic controllers deployed in factory automation environments with wide temperature ranges. IC Role / Device Role / Timing Role: Nonvolatile firmware repository accessed via parallel bus during boot and runtime updates; 120 ns access ensures compatibility with 8/16-bit microcontrollers. Use Value: Sector erase capability allows incremental firmware patches without full reflash; boot block lockout prevents corruption of critical startup routines. | Use Scenario: Holding BIOS code in desktop motherboards and embedded x86 systems requiring field-upgradable firmware prior to UEFI transition. IC Role / Device Role / Timing Role: Primary boot memory mapped into CPU address space; operates as EPROM-compatible device during POST initialization sequence. Use Value: Two 16K boot blocks enable dual-image redundancy (primary/backup BIOS); software protection prevents unauthorized modification during OS runtime. |
| Medical Device Configuration Memory | Telecom Line Card Boot Code |
Use Scenario: Retaining calibration tables, safety parameters, and device-specific settings in Class II medical instruments subject to regulatory traceability requirements. IC Role / Device Role / Timing Role: Secure nonvolatile storage for mission-critical configuration data; accessed only during power-up or maintenance mode via isolated controller interface. Use Value: Hardware VCC-sense protection ensures writes cannot occur during brown-out conditions; >10,000 endurance supports lifetime recalibration cycles. | Use Scenario: Hosting boot loader and FPGA configuration bitstreams on telecom line cards operating in NEBS-compliant central office environments. IC Role / Device Role / Timing Role: Parallel-interface Flash memory interfaced to ARM or PowerPC host processors; supports hot-swap firmware updates without card removal. Use Value: TSOP-32 package enables high-density layout on multi-layer backplane cards; 100 µA standby current minimizes thermal load in fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-120EC | 4 Mbit, 120 ns, 3.3 V core (with 5 V I/O tolerance), 64K-byte uniform blocks vs. 256-byte sectors | Larger erase granularity limits fine-grained updates; requires level-shifting in pure 5V systems | Choose when migrating to lower-voltage systems with compatible bus signaling |
| MX29LV040CTTI-12G | 4 Mbit, 120 ns, 3.0–3.6 V supply only, no 5V operation; supports CFI query mode | Incompatible with 5V-only designs; lacks boot block lockout and hardware VCC-sense protection | Prefer for new 3.3V designs requiring industry-standard command sets and faster erase times |
Compared with AM29LV040B-120EC and MX29LV040CTTI-12G, the AT29C040A-12TC uniquely supports true 5V-only operation with sector-level granularity, integrated boot block security, and robust hardware write inhibition - making it irreplaceable in legacy 5V embedded systems requiring field-safe firmware updates.
Availability
AT29C040A-12TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, and medical device configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT29C040A-12TC 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, Flash memory, and secure authentication devices.
The AT29C040A-12TC belongs to Atmel's 5-volt-only Flash family designed specifically for in-system reprogrammability in legacy embedded systems where high-voltage programming infrastructure is unavailable.
FAQ
What is the operating temperature range for the AT29C040A-12TC?
The AT29C040A-12TC is rated for industrial temperature operation from –40°C to +85°C, as confirmed by the "Ordering Information" table specifying "-12TI" and "-12TC" variants for industrial use. This makes the AT29C040A-12TC suitable for deployment in harsh environments such as factory floors and outdoor telecom equipment cabinets where ambient thermal stability cannot be guaranteed.
Does the AT29C040A-12TC require high-voltage programming signals?
No, the AT29C040A-12TC uses 5-volt-only programming - no external high-voltage (e.g., 12 V) supply is needed. All program and erase operations are initiated using standard 5V logic levels applied to CE, WE, and OE pins in precise timing sequences. This design eliminates the need for charge pumps or external HV generators, simplifying system-level implementation of firmware updates in the AT29C040A-12TC.
How does boot block lockout work on the AT29C040A-12TC?
The AT29C040A-12TC features two independent 16K-byte boot blocks - one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Lockout is enabled via a 7-command software algorithm; once activated, those blocks become permanently read-only. The AT29C040A-12TC retains lockout state across power cycles, and chip erase is disabled if either block is locked.
Can the AT29C040A-12TC be used as a direct replacement for EPROMs like the 27C040?
Yes, the AT29C040A-12TC is pin-compatible and functionally compatible with 27C040 EPROMs in read mode - CE/OE/WE timing matches standard EPROM access, and outputs are TTL/CMOS compatible. However, unlike EPROMs, the AT29C040A-12TC supports in-system reprogramming without UV erasure or socket removal, offering significant field-service advantages over the 27C040.
What package type is used for the AT29C040A-12TC?
The AT29C040A-12TC uses a 32-lead Thin Small Outline Package (TSOP Type 1), designated "32T" in Atmel's ordering nomenclature. Its dimensions are 8 mm × 20 mm with 0.5 mm lead pitch, JEDEC MO-142 BD compliant, and optimized for surface-mount assembly in space-constrained applications - distinct from the PDIP ("32P6") and PLCC ("32J") variants of the same device.
AT29C040A-12TC 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:
- 120 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-12TC FAQ
1.How can I place an order for AT29C040A-12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-12TC 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-12TC reliable?
The price and inventory of AT29C040A-12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-12TC is usually 5 days.
3.What payment methods are accepted for AT29C040A-12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-12TC?
AT29C040A-12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-12TC 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-12TC?
For technical support, including AT29C040A-12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-12TC requirements.
6.How does Aetrix verify that AT29C040A-12TC is sourced from the original manufacturer or authorized distributors?
All AT29C040A-12TC 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-12TC meets industry standards.
7.What is the process for return or replacement of AT29C040A-12TC?
All AT29C040A-12TC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-12TC, 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-12TC part is unused and in its original packaging.
Return procedure for AT29C040A-12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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