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Microchip Technology AT49F040A-55TU
- Part No.:
- AT49F040A-55TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F040A-55TU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,231
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Product details
Overview
AT49F040A-55TU from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) single-voltage 5V-only Flash memory IC used for nonvolatile code and data storage in embedded systems. It delivers 55 ns read access time, supports byte-by-byte programming at 20 µs/byte, features sector-erasable architecture with boot-block lockout, and operates across -40°C to +85°C.
For engineers reviewing the AT49F040A-55TU datasheet, AT49F040A-55TU pinout, AT49F040A-55TU application, or AT49F040A-55TU equivalent, key selection criteria include its 5V-only operation, 16K-byte programmable-lockout boot block, 6-second chip erase time, CMOS standby current of 70 µA, and compatibility with standard EPROM-like CE/OE/WE control interface.
Technical Context
The AT49F040A-55TU implements a command-based Flash architecture with internal program control logic and timer, eliminating need for external high-voltage programming supplies. Its sector organization includes one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and eight main memory blocks (one 32K-byte + seven 64K-byte).
Device operation relies on six-cycle software command sequences for chip erase, sector erase, and boot lockout enablement - all executed via standard microprocessor write timing on CE/WE-controlled buses. DATA polling (I/O7 complement) and toggle-bit (I/O6) mechanisms provide real-time program/erase cycle completion detection without external timing dependencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8) - supports firmware storage for mid-complexity microcontroller boot images and configuration data. |
| Read Access Time | 55 ns - enables direct execution from flash (XIP) in systems with ≤18 MHz bus clocks. |
| Byte Programming Time | 20 µs typical - allows field-upgradable parameter tables without system downtime exceeding 100 ms per 5 KB. |
| Chip Erase Time | 12 seconds max - ensures predictable firmware update windows in industrial controllers. |
| Standby Current | 70 µA CMOS - meets low-power requirements for battery-backed or energy-harvested edge nodes. |
| Operating Voltage | 5V ±10% - simplifies power design by eliminating dual-rail supplies or charge pumps. |
| Endurance | 10,000 write/erase cycles - supports >5 years of daily reconfiguration in test equipment or PLC modules. |
| Temperature Range | -40°C to +85°C - qualified for industrial automation, automotive body control, and outdoor communications hardware. |
Pinout & Package
AT49F040A-55TU is packaged in a 32-lead TSOP (Type 1, 8 × 20 mm), pin-compatible with industry-standard 32-pin Flash memory sockets and PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11–A18 are don't-care during command entry. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; inhibits programming when high. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention; must be high during programming/erase cycles. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming; noise-filtered against <15 ns glitches. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit data path for reads, programming, and command loading; I/O6 provides toggle-bit status, I/O7 enables DATA polling. |
| VCC | Power Supply | 5V ±10% supply; device inhibits programming if VCC drops below 3.8V (VCC sense protection). |
| GND | Ground | Reference for all inputs/outputs; decoupling capacitor required within 10 mm of VCC pin per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for 12V programming voltage generators, reducing BOM count and board space in cost-sensitive designs. |
| Boot Block Programming Lockout | Hardware-enforced 16K-byte region (00000H–03FFFH) prevents accidental overwrite of bootloader code after activation via 6-cycle command sequence. |
| DATA Polling & Toggle Bit | Dual asynchronous status reporting (I/O7 complement / I/O6 toggling) enables deterministic firmware update routines without fixed delay loops or external timers. |
| Sector-Erasable Architecture | Independent erasure of boot, parameter, and main memory blocks allows selective firmware updates without full-chip erase - preserving calibration data and user settings. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line interlock prevent spurious writes during power transients or EMI events in harsh industrial environments. |
| Green (Pb/Halide-Free) Packaging | TSOP package complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) handling requirements. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module |
|---|---|
Use Scenario: Storing ladder logic programs and I/O mapping tables in programmable logic controllers requiring field updates via serial port or USB-to-parallel adapter. IC Role / Device Role / Timing Role: Nonvolatile code storage with XIP-capable 55 ns read timing; boot block holds secure startup routine while main blocks store user-configurable logic. Use Value: Sector erase preserves parameter blocks during firmware upgrades, avoiding recalibration; 70 µA standby current extends battery life during maintenance mode. | Use Scenario: Holding door lock actuator calibration data, window position profiles, and lighting sequence definitions in vehicle body control units. IC Role / Device Role / Timing Role: Parameter memory with hardware-protected boot sector storing CAN initialization code; parameter blocks retain user preferences across ignition cycles. Use Value: Boot lockout prevents corruption of safety-critical startup firmware during over-the-air updates; 10,000-cycle endurance supports 15+ years of dealership reprogramming. |
| Medical Diagnostic Equipment | Network Router Boot Image |
Use Scenario: Storing FPGA configuration bitstreams and sensor calibration coefficients in portable ultrasound devices requiring FDA-compliant traceability and revision control. IC Role / Device Role / Timing Role: Dual-role memory: boot block holds certified diagnostic kernel; parameter blocks store site-specific transducer compensation tables. Use Value: DATA polling enables deterministic update verification for audit trails; green packaging meets IEC 60601-1 environmental compliance requirements. | Use Scenario: Hosting primary bootloader and fail-safe recovery image in enterprise-grade routers where firmware corruption must trigger automatic fallback. IC Role / Device Role / Timing Role: Redundant boot memory with independent erase zones - main block holds active image, boot block contains verified recovery code. Use Value: 6-second chip erase allows sub-10 second recovery image reload; 5V-only interface simplifies power sequencing with single DC/DC converter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-55-4C-NHE | 4 Mbit, 55 ns, 3.3V core (5V I/O tolerant); 12V programming not required but uses different command set. | Requires level-shifting for pure 5V systems; lacks dedicated boot-block lockout feature. | Select when migrating to lower-voltage platforms or when SST's auto-select command simplifies firmware abstraction layers. |
| MX29LV400CTTI-55G | 4 Mbit, 55 ns, 3.0V–3.6V operation only; no 5V compatibility; C-type (top-boot) sector map differs from AT49F040A's bottom-boot layout. | Not pin-compatible; requires PCB redesign and firmware adaptation for sector addressing. | Choose only for new 3.3V designs where MXIC's extended temperature range (-40°C to +105°C) adds value. |
Compared with SST39VF400A-55-4C-NHE and MX29LV400CTTI-55G, the AT49F040A-55TU provides native 5V operation with guaranteed boot-block lockout and TSOP pinout compatibility - making it the preferred choice for legacy 5V industrial controllers requiring zero-change hardware upgrades.
Availability
AT49F040A-55TU is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical diagnostic devices, and network infrastructure equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT49F040A-55TU 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 technical and manufacturing continuity for the AT49F040A family. The company specializes in microcontrollers, analog, and Flash memory solutions for industrial, automotive, and consumer markets.
The AT49F040A product line was designed for cost-sensitive, 5V-based embedded systems requiring reliable in-system reprogrammability - particularly where bootloader integrity, sector-level erase granularity, and minimal external circuitry are critical.
FAQ
What is the maximum chip erase time for the AT49F040A-55TU?
The AT49F040A-55TU has a maximum chip erase time of 12 seconds, as specified in the AC characteristics table. This value applies when the boot block lockout feature is disabled; if enabled, only parameter and main memory blocks are erased, but the total time remains bounded by the same 12-second limit. The device performs internal timing, requiring no external clocks or monitoring during the erase cycle.
Does the AT49F040A-55TU support true 5V-only operation for both read and programming functions?
Yes, the AT49F040A-55TU supports true 5V-only operation: reads occur at 5V, and all programming and erase commands execute using only 5V supply with no external high-voltage generator required. Its VCC sense circuitry disables programming if VCC falls below 3.8V, ensuring reliable operation across the full 5V ±10% range specified for the AT49F040A-55TU.
How is boot block protection activated on the AT49F040A-55TU?
Boot block protection on the AT49F040A-55TU is activated by executing a precise six-cycle command sequence: load AAh to address 555H, 55h to AAAH, 80h to 555H, AAh to 555H, 55h to AAAH, then 40h to 555H - with a 1-second pause before the final command. Once enabled, the 16K-byte boot block (00000H–03FFFH) becomes permanently read-only and cannot be erased or programmed.
Can the AT49F040A-55TU be used in place of standard EPROMs like the 27C040 without circuit modification?
Yes, the AT49F040A-55TU is functionally compatible with 27C040 EPROMs in read mode: it uses identical CE/OE/WE control signals, same 32-pin TSOP footprint, and outputs valid data within 55 ns when CE and OE are low and WE is high. However, programming requires command sequences instead of UV erasure, so system firmware must implement Flash-specific write protocols.
What are the valid sector address ranges for sector erase operations on the AT49F040A-55TU?
The AT49F040A-55TU defines sector addresses as follows: BOOT BLOCK = 00000H–03FFFH; PARAMETER BLOCK 1 = 04000H–05FFFH; PARAMETER BLOCK 2 = 06000H–07FFFH; MAIN MEMORY BLOCK 1 = 08000H–FFFFH; BLOCK 2 = 10000H–1FFFFH; BLOCK 3 = 20000H–2FFFFH; BLOCK 4 = 30000H–3FFFFH; BLOCK 5 = 40000H–4FFFFH; BLOCK 6 = 50000H–5FFFFH; BLOCK 7 = 60000H–6FFFFH; BLOCK 8 = 70000H–7FFFFH - all accessed via the sixth-cycle address in the sector erase command.
AT49F040A-55TU 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:
- 40µs
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49F040A-55TU FAQ
1.How can I place an order for AT49F040A-55TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040A-55TU 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 AT49F040A-55TU reliable?
The price and inventory of AT49F040A-55TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040A-55TU is usually 5 days.
3.What payment methods are accepted for AT49F040A-55TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040A-55TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040A-55TU?
AT49F040A-55TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040A-55TU 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 AT49F040A-55TU?
For technical support, including AT49F040A-55TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040A-55TU requirements.
6.How does Aetrix verify that AT49F040A-55TU is sourced from the original manufacturer or authorized distributors?
All AT49F040A-55TU 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 AT49F040A-55TU meets industry standards.
7.What is the process for return or replacement of AT49F040A-55TU?
All AT49F040A-55TU units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040A-55TU, 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 AT49F040A-55TU part is unused and in its original packaging.
Return procedure for AT49F040A-55TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F040A-55TU Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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