AT45DB041D-SU - 4Mbit SPI DataFlash 66MHz | Renesas
MPN: AT45DB041D-SU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.48 | $0.48 |
| 10 | $0.43 | $4.30 |
| 100 | $0.39 | $39.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.343 | $343.00 |
AT45DB041D-SU Overview
DataFlash is a family of serial-interface flash memory organized by pages rather than the uniform sectors of standard serial NOR flash. Within the memory hierarchy, the AT45DB041D-SU sits as a nonvolatile storage IC below parallel NOR and NAND devices, offering a minimal pin count and simple command protocol. Page organization makes it well suited to code storage, data logging, and DSP coefficient storage where small blocks are rewritten independently.
Key features include 4,325,376 bits organized as 2,048 pages of 256 or 264 bytes, a RapidS serial interface SPI-compatible for clock frequencies up to 66 MHz, page program operation in a single cycle, and two independent 264-byte SRAM data buffers that allow simultaneous buffering while a page is being programmed or erased. A page-erase plus block-erase architecture supports flexible data management.
Technically, the device uses a dual-buffer architecture: the two SRAM buffers decouple the serial interface from internal program/erase timing, so the host can stream the next data block at full 66 MHz while the previous page programs. Voltage range of 2.7 V to 3.6 V supports 3.3 V systems directly.
Typical applications include digital voice recorders, image storage buffers, program code and data storage in embedded controllers, and battery-powered data loggers.
Design consideration: choose either the 256-byte or 264-byte page mode at design time, since the two modes use different addressing and opcodes and are not interchangeable.
This page synthesizes distributor data, drop-in alternatives, pricing tiers, and design notes not found in the manufacturer datasheet. Pricing referenced is as of 2026-09-14.
Drop-in alternatives for AT45DB041D-SU β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AT45DB041D-SU (same form factor and footprint) β differing in Interface, Maximum Clock Frequency, Memory Type, Package.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
AT45DB041E-SHN-B
β Drop-Inπ Reference alternative (not in catalog)
AT45DB021D-SU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
AT45DB081D-SU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
AT45DB161D-SU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
AT45DB321D-SU
β Drop-Inπ Reference alternative (not in catalog)
AT45DB041D-SU Maximum Ratings & Electrical Characteristics
| Memory Type | DataFlash (serial NOR Flash) |
| Memory Size | 4 Mbit (512K x 8) |
| Organization | 2048 pages x 264 bytes (or 256 bytes) |
| Interface | SPI, RapidS serial |
| Maximum Clock Frequency | 66 MHz |
| Supply Voltage | 2.7 V to 3.6 V |
| SRAM Data Buffers | 2 x 264 bytes |
| Program Operation | Page program, single cycle |
| Package | 8-Pin SOIC EIAJ (SO. 150 mil) |
| Mounting Type | Surface Mount |
| Access Time | 6 ns |
| Applications | Digital voice, image, program code and data storage |
AT45DB041D-SU Pin Configuration
| Pin 1 | CS β Chip select (active low serial interface enable) |
| Pin 2 | SCK β Serial clock input (up to 66 MHz) |
| Pin 3 | SI β Serial data input (commands, address, data) |
| Pin 4 | GND β Ground |
| Pin 5 | SO β Serial data output |
| Pin 6 | WP β Hardware write protect |
| Pin 7 | RESET β Reset input |
| Pin 8 | VCC β Power supply (2.7 V to 3.6 V) |
Typical Applications
AT45DB041D-SU is suitable for 6 applications: Digital Voice Recording, Embedded Program Code Storage, Industrial Data Logging, Image and Graphics Buffering, Battery-Powered Portable Devices, Configuration and Parameter Storage.
Digital Voice Recording
The AT45DB041D-SU fits digital voice recorders because its 264-byte page architecture maps naturally onto fixed-size audio frame buffers, and its dual 264-byte SRAM buffers let the MCU stream the next frame at 66 MHz while the previous page programs. A 4-second-to-minute recording at typical voice bitrates fits comfortably in the 4,325,376-bit array. In the circuit, the host MCU writes frames to buffer 1 via SI while page programming proceeds in the background; buffer-to-page transfer opcodes then commit data without stalling the serial interface. The 2.7 V to 3.6 V single supply suits 3.3 V battery designs, and holding CS high between recordings minimizes standby current.
Recommended
Embedded Program Code Storage
The AT45DB041D-SU stores boot code and firmware images for MCUs and DSPs lacking adequate internal flash. Its 66 MHz RapidS interface shadows a 512 KB code image to RAM in tens of milliseconds, materially shortening boot time versus 20 MHz-class serial flash. The device connects directly to the MCU SPI port with CS, SCK, SI, SO lines plus optional WP and RESET for write protection and brown-out recovery. Page programming is single-cycle, so firmware updates overwrite pages without lengthy erase sequences, and the two SRAM buffers support read-while-write firmware staging. The 2.7 V to 3.6 V range matches standard 3.3 V embedded rails without level shifting.
Recommended
Industrial Data Logging
Industrial data loggers use the AT45DB041D-SU to record sensor samples over weeks of operation. The 2,048-page structure supports wear-levelling schemes that rotate the write pointer across pages, spreading erase cycles and extending endurance, while the dual 264-byte SRAM buffers accumulate samples between page commits - reducing erase frequency. The 66 MHz SPI bus keeps logging transactions short so the MCU can sleep between samples in battery-powered installations. WP pin protection prevents corruption during power transients, and the RESET pin allows recovery from brown-out conditions common in factory environments. The SOIC-8 footprint conserves PCB area in DIN-rail and remote sensor enclosures.
Recommended
Image and Graphics Buffering
The AT45DB041D-SU serves as image and graphics storage in cost-sensitive display systems such as small TFT modules and label printers. At 4 Mbit it holds several compressed bitmap frames, and the dual-buffer architecture streams one 264-byte block at 66 MHz while the previous block programs - sustaining continuous pixel-data throughput without interface stalls. The 6 ns access specification supports fast sequential reads during screen refresh via SPI. Designers typically map scanline segments to pages and use buffer-to-page opcodes to manage frame updates. The 2.7 V to 3.6 V supply integrates directly with 3.3 V display controllers, avoiding extra level-shifting circuitry and BOM cost.
Recommended
Battery-Powered Portable Devices
Portable battery-powered devices - meters, tags, medical monitors - choose the AT45DB041D-SU for its low pin count, single 2.7 V to 3.6 V supply, and serial interface that keeps MCU GPIO and controller cost minimal. Because the flash array is only active during transfers, average system consumption is dominated by the MCU, not the memory; deasserting CS places the DataFlash interface in standby. The dual SRAM buffers allow burst logging on wake-up events, and single-cycle page program shortens active time per event. The SOIC-8 150 mil package suits compact two-layer boards. WP and RESET pins add robustness against user battery-removal transients.
Recommended
Configuration and Parameter Storage
System calibrations, serial numbers, and network configuration blocks are stored in the AT45DB041D-SU by factory and field tools alike. A single 264-byte page holds a typical parameter record, and the dual-buffer scheme allows a new configuration to be validated in SRAM before a buffer-to-page commit makes it live - avoiding corrupted settings on power loss mid-write. Reads at 66 MHz let the bootloader retrieve parameters in microseconds at startup. The WP pin can hard-protect factory pages against field rewrites. For 3.3 V systems the device needs no external voltage translation, and its SOIC-8 footprint occupies minimal board area next to the main controller.
Recommended
Recommended Products Summary
Engineering reference data for AT45DB041D-SU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AT45DB041E-SHN-B | AT45DB021D-SU | AT45DB081D-SU | AT45DB321D-SU |
|---|---|---|---|---|---|
| Package | SOIC-8 (150 mil, EIAJ) | SOIC-8 (150 mil) - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 family - same pinout |
| Brand | Renesas Electronics (Atmel legacy) | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Density | 4 Mbit | 4 Mbit | 2 Mbit | 8 Mbit | 32 Mbit |
| Max Clock Frequency | 66 MHz | 85 MHz | 66 MHz | 66 MHz | 66 MHz |
| Supply Voltage | 2.7 V to 3.6 V | 1.65 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| Organization | 2048 pages x 264 bytes | 2048 pages x 264/256 bytes | 1024 pages x 264/256 bytes | 4096 pages x 264/256 bytes | 8192 pages x 528/512 bytes |
| SRAM Buffers | 2 x 264 bytes | 2 buffers (same size) | 2 x 264 bytes | 2 x 264 bytes | 2 x 528 bytes |
| Software Compatibility | Baseline DataFlash opcode set | Backward-compat mode available | Same opcodes, different addressing | Same opcodes, different addressing | Same family, larger page size |
Key Differentiators
- Dual 264-byte SRAM buffers with single-cycle page program (vs Generic SPI NOR flash)
- Higher read speed than D-family baseline (vs AT45DB021D-SU)
- Lower supply floor in successor (vs AT45DB041E-SHN-B)
Design Notes
Decide between 264-byte and 256-byte page mode before firmware freeze. The two modes use different addressing fields and different buffer/page opcodes, and per the datasheet the mode is a device configuration set at manufacture/order time - it cannot be toggled at runtime. Migrating code between D and E variants or between densities (AT45DB021D vs AT45DB081D) requires updating page-address widths even though the SPI protocol is otherwise identical.
Place a 100 nF ceramic decoupling capacitor directly across VCC (pin 8) and GND (pin 4), within a few millimetres of the pins. Keep SCK traces short and route away from SO to limit crosstalk at 66 MHz operation; series termination (22-33 ohm) at the SCK driver helps when trace length exceeds a few centimetres. Pull WP high via a 10 kohm resistor when write protection is not used, and tie RESET to the MCU supervisor output rather than leaving it floating.
Estimated: program and erase operations draw peak currents above the idle level on the 2.7-3.6 V rail; budget supply headroom and bulk capacitance (e.g. 10 uF) so the 3.3 V rail does not sag during buffer-to-page commits. Deasserting CS between transactions places the interface in standby, which is the primary lever for battery-powered designs. Verify actual ICC values in the 53-page manufacturer datasheet before finalizing the power budget.
Compliance Information
Compliance details were not present in the verified web data; confirm on the Renesas product page or certificate of conformity.
