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Microchip Technology AT49F040A-55TI
- Part No.:
- AT49F040A-55TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F040A-55TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,175
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Product details
Overview
AT49F040A-55TI from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) 5V-only in-system reprogrammable Flash memory IC with 55 ns read access time, organized in sector architecture including one 16 KB boot block with programming lockout, two 8 KB parameter blocks, and eight main memory blocks (one 32 KB + seven 64 KB). It supports byte-by-byte programming at 20 µs/byte and chip/sector erase in ≤6 seconds, used for firmware storage and secure boot code retention in industrial microcontroller systems.
For engineers reviewing the AT49F040A-55TI datasheet, AT49F040A-55TI pinout, AT49F040A-55TI application, or AT49F040A-55TI equivalent, key selection considerations include its 5V-only operation, 55 ns read timing, boot block write protection capability, sector-erase flexibility, and compatibility with standard EPROM-like CE/OE/WE control interface in embedded system designs.
Technical Context
The AT49F040A-55TI implements a command-based Flash architecture requiring six-cycle sequences for chip erase and sector erase, and four-cycle sequences for byte programming. Its internal program control logic eliminates external high-voltage programming supplies, enabling in-system reprogramming using only 5V.
It features dual end-of-operation detection: DATA polling (I/O7 complement toggle) and Toggle Bit (I/O6 toggling), both usable at any point during program/erase cycles. Hardware data protection includes VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibit (OE low, CE high, or WE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), supporting firmware image storage for mid-complexity microcontrollers |
| Read Access Time | 55 ns - enables direct execution from flash in real-time industrial controllers without wait states |
| Byte Programming Time | 20 µs typical - allows rapid field updates of configuration parameters or calibration data |
| Erase Cycle Time | ≤6 seconds for full chip or individual sector - supports fast firmware patching without full device reset |
| Write Endurance | 10,000 program/erase cycles - suitable for infrequent but critical firmware upgrades over product lifetime |
| Power Dissipation | 20 mA active / 70 µA CMOS standby - meets low-power requirements in always-on industrial modules |
| Operating Voltage | 5V ±10% - simplifies power design by eliminating dedicated programming voltage rails |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade embedded applications |
Pinout & Package
AT49F040A-55TI is available in 32-lead TSOP (Type 1, 8 × 20 mm) package per JEDEC MO-142 BD, with gull-wing leads and pin 1 identifier marked on top surface.
| 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 in command cycles |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; controls address/data latching in command cycles |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention; high during programming/erase |
| WE | Write Enable | Active-low write strobe; initiates command loading and byte programming; rising edge latches data in command cycles |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit data path for read, program, and command input; I/O7 used for DATA polling, I/O6 for Toggle Bit status |
| VCC | Power Supply | +5V ±10% supply; VCC sense circuit disables programming if voltage drops below ~3.8V |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB (00000H–03FFFH) permanently protected via 6-cycle command sequence, securing boot loader code against accidental overwrite |
| Sector Erase Flexibility | Independent erasure of two 8 KB parameter blocks and eight main memory blocks (32 KB + 7×64 KB), enabling selective firmware updates without full chip erase |
| DATA Polling Detection | I/O7 returns complement of programmed data until completion, then true data - enables precise timing of next memory access without fixed delays |
| Hardware Data Protection | Triple-layer safeguard: VCC monitoring, control-line inhibit (OE/CE/WE states), and noise filtering on WE/CE inputs prevents spurious writes |
| Green Packaging Option | Pb/Halide-free TSOP package compliant with RoHS Directive 2011/65/EU, supporting environmentally regulated industrial deployments |
Applications
| Industrial PLC Firmware Storage | Secure Boot Loader Retention |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O mapping tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with 55 ns read access enabling deterministic scan cycle execution; sector erase allows versioned firmware rollback. Use Value: Eliminates need for external EEPROM or battery-backed SRAM; boot block lockout ensures bootloader integrity across firmware updates. | Use Scenario: Hosting immutable boot code in medical diagnostic equipment requiring FDA-compliant firmware update traceability. IC Role / Device Role / Timing Role: Secure boot memory with hardware-enforced write protection; 10,000-cycle endurance supports long-term field serviceability. Use Value: Prevents unauthorized modification of startup routines; DATA polling enables reliable status feedback during field-programming procedures. |
| Automotive ECU Parameter Calibration | Telecom Base Station Configuration |
Use Scenario: Storing engine calibration maps and emission control parameters in Tier-1 automotive ECUs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability parameter storage with 70 µA CMOS standby current minimizing parasitic drain; sector architecture isolates calibration data from main firmware. Use Value: Enables over-the-air (OTA) calibration updates without disrupting core control algorithms; hardware VCC sense prevents corruption during cold-cranking voltage dips. | Use Scenario: Holding baseband configuration profiles and protocol stack parameters in 4G/LTE small cell radios requiring remote reconfiguration. IC Role / Device Role / Timing Role: Field-upgradable configuration memory with byte-programming granularity; Toggle Bit provides robust end-of-write detection under variable network latency conditions. Use Value: Reduces downtime during carrier-specific feature activation; green packaging meets EU WEEE compliance for telecom infrastructure. |
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 tolerant I/O), 12V VPP not required; different command set and sector map | Requires 3.3V supply rail; lacks boot block lockout; uses uniform 4 KB sectors instead of mixed-size blocks | Select when migrating to lower-voltage systems and accepting reduced security isolation for boot code |
| MX29LV400CTTI-55G | 4 Mbit, 55 ns, 3.0–3.6V operation; 12V VPP required for programming; 16 KB boot sector with write protection | Needs external high-voltage generator; slower programming due to VPP requirement; identical boot sector size but different lockout mechanism | Choose only if legacy 3.3V design constraints mandate compatibility with MXIC's command set and timing |
Compared with SST39VF400A-55-4C-NHE and MX29LV400CTTI-55G, the AT49F040A-55TI uniquely delivers 5V-only operation with integrated boot block lockout and sector-erase flexibility-enabling simpler power design and stronger firmware security in industrial control applications where 5V infrastructure is standard.
Availability
AT49F040A-55TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, secure boot loader retention, automotive ECU parameter calibration, and telecom base station configuration requiring stable component supply and long-lifecycle support.
Supply support for AT49F040A-55TI 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 its Flash memory portfolio for industrial and automotive applications, emphasizing reliability, longevity, and legacy design support.
The AT49F040A product line was designed for in-system reprogrammable firmware storage in resource-constrained embedded systems, prioritizing 5V compatibility, sector-level erase granularity, and hardware-secured boot code retention.
FAQ
What is the maximum operating temperature range for the AT49F040A-55TI?
The AT49F040A-55TI is rated for industrial operation from –40°C to +85°C, as confirmed in the "DC and AC Operating Range" section of the datasheet. This specification applies to both active and standby modes, and thermal derating is not required within this range. The device maintains full 55 ns read access time and reliable programming/erase functionality across the entire temperature span, making it suitable for deployment in harsh industrial environments where ambient temperatures fluctuate significantly.
Does the AT49F040A-55TI require external high-voltage programming signals?
No, the AT49F040A-55TI does not require external high-voltage programming signals. It operates exclusively at 5V for both read and reprogramming functions, as stated in the "Single-voltage Operation" feature list. Internal charge pumps generate necessary voltages for programming and erase operations, eliminating the need for 12V VPP or other auxiliary supplies. This 5V-only architecture simplifies board design and improves system reliability by removing high-voltage routing and associated noise sensitivity concerns in the AT49F040A-55TI implementation.
How is boot block protection enabled on the AT49F040A-55TI?
Boot block protection on the AT49F040A-55TI is enabled via a six-cycle command sequence: load 0xAA to address 0x555, 0x55 to address 0xAAA, 0x80 to 0x555, 0xAA to 0x555, 0x55 to 0xAAA, then 0x40 to 0x555 - followed by a 1-second pause. Once activated, the 16 KB boot block (00000H–03FFFH) becomes permanently write-protected. The AT49F040A-55TI datasheet confirms this sequence in Section 28 and notes that lockout status can be verified by reading bit I/O0 at address 00002H in software product identification mode.
What are the valid package options for the AT49F040A-55TI?
AT49F040A-55TI is specifically designated for the 32-lead TSOP (Type 1, 8 × 20 mm) package, identified by suffix "T" in the ordering code per Section 29.1 of the datasheet. It is distinct from the PLCC variant (AT49F040A-55JI), which uses suffix "J". Both packages share identical electrical specifications and timing, but differ mechanically: TSOP offers lower profile and better thermal performance for surface-mount assembly, while PLCC supports socket-based prototyping. The AT49F040A-55TI part number unambiguously refers only to the TSOP version.
Can the AT49F040A-55TI be used in place of standard EPROMs like the 27C040?
Yes, the AT49F040A-55TI is pin-compatible and functionally compatible with 27C040 EPROMs in read mode: it accepts identical CE/OE/WE control signals, outputs data on I/O0–I/O7, and uses the same 19-bit address bus (A0–A18). However, unlike one-time-programmable EPROMs, the AT49F040A-55TI supports in-system reprogramming via command sequences and requires no UV erasure. This makes the AT49F040A-55TI a drop-in replacement for read operations while adding field-upgrade capability - provided the host system implements the required command protocols for programming and erase.
AT49F040A-55TI 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-55TI FAQ
1.How can I place an order for AT49F040A-55TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040A-55TI 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-55TI reliable?
The price and inventory of AT49F040A-55TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040A-55TI is usually 5 days.
3.What payment methods are accepted for AT49F040A-55TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040A-55TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040A-55TI?
AT49F040A-55TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040A-55TI 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-55TI?
For technical support, including AT49F040A-55TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040A-55TI requirements.
6.How does Aetrix verify that AT49F040A-55TI is sourced from the original manufacturer or authorized distributors?
All AT49F040A-55TI 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-55TI meets industry standards.
7.What is the process for return or replacement of AT49F040A-55TI?
All AT49F040A-55TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040A-55TI, 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-55TI part is unused and in its original packaging.
Return procedure for AT49F040A-55TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F040A-55TI Tags
-
M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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