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Microchip Technology AT29C040A-12PC
- Part No.:
- AT29C040A-12PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT29C040A-12PC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,516
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Product details
Overview
AT29C040A-12PC from Atmel is a 4-Mbit (512K × 8) 5-volt-only Flash memory IC organized in 2048 sectors of 256 bytes each, featuring 120 ns read access time, sector-based reprogramming with internal latches, and dual 16K-byte boot blocks with independent programming lockout - used for firmware storage and system boot code in embedded controllers and industrial PLCs.
For engineers reviewing the AT29C040A-12PC datasheet, AT29C040A-12PC pinout, AT29C040A-12PC application, or AT29C040A-12PC equivalent, key selection criteria include sector-program timing (10 ms), DATA polling/Toggle Bit end-of-write detection, hardware/software data protection, boot block lockout behavior, and compatibility with 5V ±10% supply and TTL/CMOS bus interfaces.
Technical Context
The AT29C040A-12PC implements a sector-erase-and-program architecture where each 256-byte sector is internally latched before simultaneous programming; it uses standard EPROM-like read protocol (CE/OE/WE control) and supports byte-load sequencing via WE or CE pulses with strict 150 µs inter-byte timing.
It integrates dual protection mechanisms: hardware-level VCC sensing (<3.8 V inhibits programming), noise filtering (<15 ns pulse rejection), and software-controlled data protection requiring three-byte unlock sequences (AAh/55h/A0h) before any sector write - with persistent SDP state across power cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), sufficient for full microcontroller boot images and configuration tables |
| Read Access Time | 120 ns - defines maximum sustained instruction fetch rate in 5V systems |
| Sector Size | 256 bytes - enables fine-grained firmware updates without erasing entire device |
| Program Cycle Time | 10 ms per sector - determines minimum time between successive sector writes |
| Endurance | >10,000 program/erase cycles per sector - supports field firmware upgrades over product lifetime |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage, simplifies board power design |
| Standby Current | 100 µA (CMOS) - enables low-power retention in battery-backed applications |
Pinout & Package
AT29C040A-12PC is packaged in a 32-lead plastic DIP (PDIP, package code 32P6), 0.600" wide, with through-hole mounting and industry-standard pinout compatible with legacy EPROM sockets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 select byte within sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read/write operations; supports DATA polling on I/O7 and Toggle Bit on I/O6 |
| 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 write strobe; controls byte loading and initiates sector programming when CE is also low |
| 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 | Pin 16 in DIP package - physically present but internally unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Programming | Eliminates need for +12 V or +21 V programming supplies, reducing BOM count and layout complexity |
| 2048 × 256-byte Sectors | Enables modular firmware updates - only modified sectors require reprogramming, minimizing downtime |
| Dual Boot Block Lockout | Independent 16K-byte lockable regions at 0x00000–0x03FFF and 0x7C000–0x7FFFF protect bootloader code from accidental overwrite |
| Hardware + Software Protection | VCC sense, noise filtering, and 3-byte unlock sequence prevent unintended writes during power-up, EMI events, or software faults |
| DATA Polling & Toggle Bit | Real-time write status feedback via I/O7 complement or I/O6 toggling - no external timers or fixed delays needed |
Applications
| Industrial PLC Firmware Storage | Embedded Controller Boot Code |
|---|---|
Use Scenario: Storing ladder logic programs and I/O configuration in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level update capability and hardware lockout to preserve critical runtime code. Use Value: Enables field-upgradable logic without replacing hardware; boot block lockout prevents corruption during remote firmware patches. | Use Scenario: Holding boot ROM image for 8-bit/16-bit microcontrollers in medical diagnostic equipment requiring certified firmware integrity. IC Role / Device Role / Timing Role: Primary boot memory mapped at reset vector; accessed using standard EPROM timing with 120 ns tACC. Use Value: Guarantees deterministic boot sequence; software data protection ensures bootloader remains unaltered across power cycles. |
| Telecom Line Card Configuration | Automotive Body Control Module |
Use Scenario: Storing port-specific initialization parameters and calibration data in carrier-grade DSLAM line cards subject to frequent field updates. IC Role / Device Role / Timing Role: Parameter storage with 10,000-cycle endurance and DATA polling for reliable write confirmation in hot-swap scenarios. Use Value: Supports >5 years of quarterly firmware revisions without memory wear-out; sector granularity avoids full-device erase during minor config changes. | Use Scenario: Retaining vehicle-specific settings (e.g., window auto-up, mirror position) in body control units exposed to automotive temperature cycling (-40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade nonvolatile memory qualified for extended temperature range with CMOS standby current ≤300 µA. Use Value: Maintains settings during battery disconnect; low active current (40 mA) minimizes load on vehicle electrical system during reprogramming. |
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 access, 3 V core with 5 V I/O tolerance; requires VPP = 12 V for programming | Requires dual-supply design and external programming voltage; not 5V-only compatible | Select only if migrating to lower-voltage system architecture with existing 12 V programming infrastructure |
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns access, 3.3 V supply; supports both word and byte programming modes | Lower voltage operation reduces power but mandates level-shifting for 5 V bus interfacing | Prefer for new 3.3 V designs where speed is critical; not drop-in for 5 V-only systems like AT29C040A-12PC |
Compared with AM29LV040B-120EC and SST39VF400A-70-4C-NHE, the AT29C040A-12PC uniquely delivers true 5V-only operation with no VPP requirement, making it suitable for legacy 5 V controller designs where supply simplification and pin compatibility outweigh raw speed gains.
Availability
AT29C040A-12PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded controller boot code, and telecom line card configuration requiring stable component supply and long-term obsolescence management.
Supply support for AT29C040A-12PC 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 secure authentication ICs.
The AT29C040A-12PC belongs to Atmel's 5-volt-only Flash family designed for in-system reprogrammability in legacy 5 V embedded systems - prioritizing compatibility with EPROM sockets and eliminating high-voltage programming infrastructure.
FAQ
What is the maximum operating temperature range for the AT29C040A-12PC?
The AT29C040A-12PC is rated for industrial temperature operation from –40°C to +85°C, as confirmed by its ordering code suffix "I" (AT29C040A-12PI) and the "Ind." column in the AC Operating Range table. This makes the AT29C040A-12PC suitable for deployment in demanding environments such as factory automation and outdoor telecom equipment where thermal stability is critical.
Does the AT29C040A-12PC require a high-voltage programming supply?
No, the AT29C040A-12PC operates with single 5 V ±10% supply for both read and program functions - no external VPP or high-voltage generator is needed. This is explicitly stated in the Features section ("5-volt Only Reprogramming") and reinforced by the Hardware Data Protection section, which confirms programming is inhibited below 3.8 V. The AT29C040A-12PC thus simplifies power design versus older EPROMs or 3 V Flash variants requiring 12 V.
How does the boot block lockout feature work on the AT29C040A-12PC?
The AT29C040A-12PC provides two independent 16K-byte boot blocks - one at addresses 0x00000–0x03FFF (lower) and one at 0x7C000–0x7FFFF (upper). Each can be permanently locked via a seven-command algorithm; once enabled, no erase or program operations are allowed in that block. The AT29C040A-12PC retains lock status across power cycles, and chip erase is disabled if either block is locked - ensuring bootloader integrity in safety-critical systems.
Can the AT29C040A-12PC be used as a direct replacement for standard EPROMs like the 27C040?
Yes, the AT29C040A-12PC is pin-compatible with the 27C040 EPROM in PDIP packaging and uses identical read timing (CE/OE/WE control), enabling socket-level replacement. However, unlike the 27C040, the AT29C040A-12PC supports in-system reprogramming without UV erasure or device removal. Its 120 ns access time matches common 27C040-12 variants, and the AT29C040A-12PC maintains TTL/CMOS bus compatibility for seamless integration.
What methods are available to detect completion of a program cycle on the AT29C040A-12PC?
The AT29C040A-12PC supports two hardware-confirmed methods: DATA polling (reading I/O7 returns complement of loaded data until completion, then true data) and Toggle Bit (I/O6 toggles between 0 and 1 during programming, then stabilizes). Both methods are characterized in the datasheet and usable at any point during the 10 ms sector program cycle - eliminating need for fixed delay loops and improving system responsiveness. These mechanisms are intrinsic to the AT29C040A-12PC's internal state machine and require no external components.
AT29C040A-12PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT29C040A-12PC FAQ
1.How can I place an order for AT29C040A-12PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-12PC 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-12PC reliable?
The price and inventory of AT29C040A-12PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-12PC is usually 5 days.
3.What payment methods are accepted for AT29C040A-12PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-12PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-12PC?
AT29C040A-12PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-12PC 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-12PC?
For technical support, including AT29C040A-12PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-12PC requirements.
6.How does Aetrix verify that AT29C040A-12PC is sourced from the original manufacturer or authorized distributors?
All AT29C040A-12PC 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-12PC meets industry standards.
7.What is the process for return or replacement of AT29C040A-12PC?
All AT29C040A-12PC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-12PC, 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-12PC part is unused and in its original packaging.
Return procedure for AT29C040A-12PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29C040A-12PC Tags
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AT24C02C-XHM-T
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