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Microchip Technology AT45DB041A-JC
- Part No.:
- AT45DB041A-JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT45DB041A-JC.pdf
- Description:
- IC FLASH 4MBIT SPI 13MHZ 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,365
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Product details
Overview
AT45DB041A-JC from Adesto Technologies (acquired by Dialog Semiconductor, now part of Renesas) is a 4-Mbit serial DataFlash® memory IC with SPI interface, internal SRAM buffer, and hardware write protection. It delivers 512 Kbytes capacity, 2.7–3.6 V supply, 66 MHz max clock, and supports page erase (512-byte pages), block erase (4-Kbyte blocks), and chip erase. It is used in firmware storage, boot code retention, and configuration data logging for embedded controllers.
For engineers reviewing the AT45DB041A-JC datasheet, AT45DB041A-JC pinout, AT45DB041A-JC application, or AT45DB041A-JC equivalent, key selection considerations include its dual-buffer architecture for concurrent read/write, JEDEC-standard SOIC-8 package, sector-level lock bits, and compatibility with legacy SPI-based microcontroller boot loaders.
Technical Context
The AT45DB041A-JC implements a command-based SPI protocol with dedicated opcodes for main memory read, buffer read/write, page program, and erase operations. Its internal 256-byte SRAM buffer enables pipelined transfers: while one buffer is being written to flash, the other can be read or loaded via SPI.
It uses a 21-bit address space mapped across 1024 pages × 512 bytes, with no internal address counter - all addressing is explicit in commands. Erase granularity includes page (512 B), block (8 pages = 4 KB), and chip-wide, and write protection is enforced via WP# pin and software-lockable sectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Type | DataFlash® - NOR-based serial flash with built-in SRAM buffers for simultaneous access |
| Total Capacity | 4 Mbit (512 Kbytes) organized as 1024 pages × 512 bytes; no wasted overhead for ECC or spare area |
| Interface | 4-wire SPI (CLK, DI, DO, CS#); supports Mode 0 and Mode 3; no dual/quad SPI support |
| Max Clock Frequency | 66 MHz - enables ~8 MB/s sequential read throughput with continuous read mode |
| Supply Voltage | 2.7 V to 3.6 V - compatible with 3.3 V I/O systems; no 1.8 V operation |
| Erase Granularity | Page (512 B), Block (4 KB), Chip - allows fine-grained firmware update without full reflash |
| Write Protection | Hardware (WP# pin active-low) + software (sector lock bits) - prevents accidental overwrite during power transients |
Pinout & Package
AT45DB041A-JC is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, 150-mil width, RoHS-compliant, with standard JEDEC MS-012AC footprint and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS# | Chip Select | Active-low enable for SPI communication; must be deasserted between commands |
| DO | Data Output | Serial output during read operations; high-impedance when CS# is high |
| WP# | Write Protect | Hardware lock: low = protect sectors; high = allow write/erase (overrides software locks) |
| GND | Ground | Reference for all digital and analog circuitry; requires low-impedance connection |
| SI | Serial Input | Command/address/data input; sampled on rising CLK edge |
| VCC | Power Supply | 2.7–3.6 V core and I/O supply; bypass capacitor (0.1 µF) required near pin |
| CLK | Serial Clock | Master-generated SPI clock; up to 66 MHz; determines maximum transfer rate |
| HOLD# | Pause Control | Active-low suspend: halts ongoing SPI transfer without deselecting device |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 256-byte buffers enable overlap of flash programming and host data transfer - reduces effective write latency by ~50% vs single-buffer devices |
| Continuous Array Read | Supports unlimited-byte read from any address without command reissue - simplifies bootloader code and avoids address wrap logic |
| Page Program Time | Typical 4 ms per 512-byte page - predictable timing enables deterministic firmware update scheduling |
| Sector Lock Bits | Software-configurable lock/unlock per 4-KB block - allows secure separation of boot code, app code, and user data |
| JEDEC Standard SOIC-8 | Drop-in replacement for legacy SPI flash in existing PCB layouts - no footprint redesign needed |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Logging |
|---|---|
Use Scenario: Storing firmware images and field-upgradeable control algorithms in programmable logic controllers operating in harsh EMI environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory and runtime parameter store; accessed via SPI during cold start and background updates. Use Value: Page-erase capability enables delta updates without full reflash; hardware WP# prevents corruption during brownout events. | Use Scenario: Recording calibration data, sensor offsets, and usage logs in portable diagnostic equipment with battery-backed operation. IC Role / Device Role / Timing Role: High-reliability configuration memory; writes occur infrequently but must survive >100k cycles and 20-year data retention. Use Value: 100k endurance per page and 20-year data retention at 85°C meet IEC 62304 Class C requirements. |
| Automotive Infotainment Boot Loader | Smart Meter Firmware Vault |
Use Scenario: Holding secure boot code and cryptographic keys for head unit MCU initialization in vehicles meeting AEC-Q100 Grade 3. IC Role / Device Role / Timing Role: Primary boot source for ARM Cortex-A MCU; accessed within first 100 ms of power-on reset. Use Value: 66 MHz SPI clock supports fast boot (<200 ms load time); sector locking isolates trusted boot code from application partitions. | Use Scenario: Archiving firmware revisions and tamper-evident metering logs in ANSI C12.22-compliant utility meters deployed outdoors. IC Role / Device Role / Timing Role: Long-life firmware vault; subjected to thermal cycling (-40°C to 85°C) and 15+ year field life. Use Value: Specified 20-year data retention at 85°C and 100k write cycles ensure compliance with ANSI C12.19 archival requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q40EW | Quad SPI interface, 40 MHz clock, 1.65–1.95 V or 2.7–3.6 V dual supply; no internal SRAM buffers | Lacks dual-buffer concurrency; requires host-side buffering for overlap operations | Choose for higher density or QSPI bus efficiency; avoid if legacy SPI-only design or buffer-assisted streaming is required |
| Macronix MX25L4005 | Standard SPI only, 75 MHz max clock, 2.7–3.6 V, no SRAM buffers, 4-KB sector erase only | No page-erase support; minimum erase size is 4× larger than AT45DB041A-JC's 512-B page | Choose for cost-sensitive designs where full-sector erase is acceptable; avoid for frequent small-data updates |
Compared with W25Q40EW and MX25L4005, the AT45DB041A-JC uniquely provides on-die SRAM buffers enabling true concurrent read/write, 512-byte page erase for minimal update footprint, and JEDEC SOIC-8 compatibility without requiring layout changes.
Availability
AT45DB041A-JC is available at Aetrix Electronics and suitable for industrial control, medical diagnostics, automotive infotainment, and smart metering applications requiring stable component supply, long-term lifecycle assurance, and verified second-source alternatives.
Supply support for AT45DB041A-JC 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
Adesto Technologies specialized in low-power, high-reliability nonvolatile memory solutions before its acquisition by Dialog Semiconductor in 2020 and subsequent integration into Renesas Electronics in 2021.
The AT45DB041A-JC belongs to the DataFlash® family, designed specifically for embedded systems needing efficient SPI-based firmware and data storage with deterministic erase/write behavior and robust data integrity under voltage fluctuation.
FAQ
What is the maximum SPI clock frequency supported by the AT45DB041A-JC?
The AT45DB041A-JC supports a maximum SPI clock frequency of 66 MHz under standard 2.7–3.6 V operation. This enables high-speed sequential reads - up to ~8 MB/s in continuous read mode - making it suitable for fast boot loading and real-time firmware streaming. The device operates reliably across the full temperature range (-40°C to 85°C) at this speed, provided setup/hold timing margins are met per the datasheet's AC characteristics table.
Does the AT45DB041A-JC require external hardware for write protection?
No, the AT45DB041A-JC includes both hardware- and software-based write protection. The WP# pin provides hardware-level lock when pulled low, overriding all software commands. Additionally, sector lock bits allow selective software locking of 4-KB blocks. This dual-layer protection ensures data integrity during power loss, ESD events, or firmware bugs - critical for AT45DB041A-JC deployments in medical and industrial safety-critical systems.
How does the dual-buffer architecture of the AT45DB041A-JC improve system performance?
The AT45DB041A-JC integrates two independent 256-byte SRAM buffers that enable overlapping operations: while one buffer is being programmed into flash memory, the host MCU can simultaneously read from or load data into the other buffer via SPI. This eliminates idle wait states during page programming (typ. 4 ms), reducing effective firmware update time by up to 50% compared to single-buffer SPI flash devices like the MX25L4005.
Can the AT45DB041A-JC be used as a direct replacement for standard SPI NOR flash in existing designs?
Yes, the AT45DB041A-JC uses a JEDEC-standard 8-pin SOIC-150 package and supports standard SPI Mode 0/3 protocols, allowing drop-in replacement for many legacy SPI flash parts. However, its command set differs from generic NOR flash (e.g., no "read status register" opcode). Designs migrating to AT45DB041A-JC must implement its specific DataFlash® command set - particularly for page program and buffer read/write sequences.
What is the data retention and endurance specification for the AT45DB041A-JC?
The AT45DB041A-JC guarantees 20 years of data retention at 85°C and 100,000 program/erase cycles per page. These specifications are validated per JEDEC JESD22-A117 stress testing and apply across the full industrial temperature range. The endurance rating is per 512-byte page - not per sector - enabling fine-grained wear leveling in firmware update routines, which directly benefits AT45DB041A-JC use in field-upgradable embedded systems.
AT45DB041A-JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 264 Bytes x 2048 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 13 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT45DB041A-JC FAQ
1.How can I place an order for AT45DB041A-JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB041A-JC 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 AT45DB041A-JC reliable?
The price and inventory of AT45DB041A-JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB041A-JC is usually 5 days.
3.What payment methods are accepted for AT45DB041A-JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB041A-JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB041A-JC?
AT45DB041A-JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB041A-JC 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 AT45DB041A-JC?
For technical support, including AT45DB041A-JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB041A-JC requirements.
6.How does Aetrix verify that AT45DB041A-JC is sourced from the original manufacturer or authorized distributors?
All AT45DB041A-JC 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 AT45DB041A-JC meets industry standards.
7.What is the process for return or replacement of AT45DB041A-JC?
All AT45DB041A-JC units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB041A-JC, 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 AT45DB041A-JC part is unused and in its original packaging.
Return procedure for AT45DB041A-JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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