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Microchip Technology AT45DB041B-SU
- Part No.:
- AT45DB041B-SU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB041B-SU.pdf
- Description:
- IC FLASH 4MBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
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Product details
Overview
AT45DB041B-SU from Microchip Technology (formerly Atmel) is a 4-Mbit SPI serial Flash memory with dual 264-byte SRAM buffers, 20 MHz max clock, 2.5–3.6 V single-supply operation, and hardware write protection-designed for code shadowing, firmware storage, and embedded data logging in resource-constrained systems.
For engineers reviewing the AT45DB041B-SU datasheet, AT45DB041B-SU pinout, AT45DB041B-SU application, or AT45DB041B-SU equivalent, key selection criteria include its page-erase flexibility, continuous array read capability, 5.0 V-tolerant control pins, industrial temperature range (–40°C to +85°C), and compatibility with SPI Mode 0/3 for robust host interfacing.
Technical Context
The AT45DB041B-SU implements a three-level memory hierarchy (sectors → blocks → pages), with 2048 pages × 264 bytes (256 data + 8 overhead) organized into 256 blocks of 8 pages each. Its dual-buffer architecture enables concurrent data reception (into one buffer) while reprogramming the Flash array (from the other buffer).
It supports full SPI command set including Continuous Array Read (68H/E8H), Main Memory Page Read (52H/D2H), Buffer Write (84H/87H), Buffer-to-Page Program with built-in erase (83H/86H), Page Erase (81H), Block Erase (50H), and Auto Page Rewrite (58H/59H). Status register bit 7 provides real-time RDY/BUSY monitoring via SO pin polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,325,376 bits (2048 pages × 264 bytes) |
| Supply Voltage | 2.5–3.6 V or 2.7–3.6 V - single rail powers all operations, no high-voltage programming required |
| Max Clock Frequency | 20 MHz - enables fast sequential reads and buffered writes in high-throughput applications |
| Active Read Current | 4 mA typical - low power consumption during code execution or streaming data access |
| Standby Current | 2 µA typical - minimal quiescent draw for battery-backed or always-on systems |
| Write Protection | Hardware WP pin protects first 256 pages - prevents accidental firmware overwrite without external logic |
| Input Tolerance | 5.0 V-tolerant SI, SCK, CS, RESET, WP - simplifies level-shifting in mixed-voltage MCU designs |
Pinout & Package
AT45DB041B-SU is supplied in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch) compliant with RoHS, Pb-free, and halide-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; falling edge initiates command sequence; must remain low during full instruction cycle |
| SCK | Serial Clock | Input-only; controls data timing; rising edge clocks data in, falling edge clocks data out (SPI Mode 0/3 compatible) |
| SI | Serial Input | Input-only; receives opcodes, addresses, and data; MSB-first protocol |
| SO | Serial Output | Output-only; returns read data, status register bits, or compare results; tri-stated when CS high |
| WP | Write Protect | Active-low hardware lock for first 256 pages; must be high to program protected region |
| RESET | Chip Reset | Active-low; forces internal state machine to idle; no external pull-up required due to internal POR circuit |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output; pulled low during self-timed operations (erase, program, transfer); used for polling instead of fixed delays |
| VCC / GND | Power Supply | Single 2.5–3.6 V supply; decoupling capacitor recommended near VCC pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual 264-byte SRAM buffers | Enables simultaneous data streaming into one buffer while reprogramming Flash from the other - eliminates host wait states |
| Continuous Array Read | Supports seamless code shadowing across page boundaries without address reload or delay - ideal for XIP-like execution |
| Self-timed page programming | No external timing control needed; erase+program completes in ≤ tEP (max 20 ms); status register bit 7 indicates completion |
| Flexible erase granularity | Page (264 B) or block (2112 B) erase options - balances speed vs. wear leveling for partial updates |
| EEPROM emulation support | Three-step Read-Modify-Write via buffers allows byte-level alterations without full-page rewrite overhead |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
Use Scenario: Storing bootloaders, application firmware, and configuration tables in microcontroller-based industrial controllers. IC Role / Device Role / Timing Role: Nonvolatile program memory accessed via SPI during startup and runtime updates. Use Value: Enables field firmware upgrades without external programmers; 2048-page structure supports versioned partitioning and rollback. | Use Scenario: Executing code directly from external memory by copying critical routines into RAM on demand. IC Role / Device Role / Timing Role: High-speed sequential read source for cached instruction fetches using Continuous Array Read mode. Use Value: Eliminates page-boundary stalls; 20 MHz clock sustains >2 MB/s effective throughput for real-time code loading. |
| Data Logging | Embedded Configuration Storage |
Use Scenario: Recording sensor readings, event timestamps, and diagnostic logs in medical devices and environmental monitors. IC Role / Device Role / Timing Role: Buffered write target supporting burst capture and background Flash programming. Use Value: Dual buffers allow uninterrupted data acquisition at up to 2.5 MB/s while Flash erases/programs in background. | Use Scenario: Persisting calibration coefficients, user preferences, and network settings in smart home gateways and IoT edge nodes. IC Role / Device Role / Timing Role: EEPROM-replacement storage with byte-alterable emulation via Read-Modify-Write sequences. Use Value: Avoids full-page rewrites for small parameter changes; hardware WP pin safeguards factory defaults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB041D-SU | Successor device with enhanced reliability, same pinout and command set; supports higher endurance (100k cycles vs. 10k) and extended data retention (20 years vs. 10 years) | Identical use cases but preferred for new designs requiring longer lifecycle and improved write endurance | Select AT45DB041D-SU for production ramp; AT45DB041B-SU remains viable for legacy repair or cost-sensitive replacements where spec margin suffices |
| W25Q40EWUXIE | 4 Mbit Quad SPI Flash (Winbond); supports QPI/DTR modes, faster program times (typ. 3 ms/page), but lacks dual buffers and continuous array read | Better raw speed for bulk writes; unsuitable for true continuous streaming or background buffering workflows | Choose W25Q40EWUXIE only if host supports Quad SPI and buffering logic is implemented in software; not drop-in for AT45DB041B-SU's dual-buffer concurrency model |
Compared with AT45DB041B-SU, AT45DB041D-SU offers measurable improvements in endurance and retention without changing layout or firmware, while W25Q40EWUXIE trades buffer concurrency for higher interface bandwidth-making it suitable only when host-side buffering replaces hardware-assisted overlap.
Availability
AT45DB041B-SU is available at Aetrix Electronics and suitable for firmware storage, code shadowing, data logging, and embedded configuration storage requiring stable component supply across industrial and commercial product lifecycles.
Supply support for AT45DB041B-SU 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 is a global semiconductor company delivering microcontrollers, analog, FPGA, and memory solutions for embedded control applications.
The AT45DB041B-SU belongs to Microchip's DataFlash® family-designed specifically for systems needing SPI-based nonvolatile storage with integrated buffering to eliminate host CPU stalls during Flash reprogramming.
FAQ
What is the maximum clock frequency supported by the AT45DB041B-SU?
The AT45DB041B-SU supports a maximum serial clock (SCK) frequency of 20 MHz for all read, write, and command operations. This rating applies across the full industrial temperature range (–40°C to +85°C) and 2.5–3.6 V supply. The device maintains timing compliance under these conditions without requiring derating, enabling high-throughput data streaming and rapid firmware updates in the AT45DB041B-SU.
Does the AT45DB041B-SU require high-voltage programming?
No, the AT45DB041B-SU does not require high-voltage programming. All program and erase operations execute from the same 2.5–3.6 V supply used for read operations. Internal charge pumps generate necessary voltages, eliminating external HV circuitry. This simplifies system design and improves reliability-confirmed in the AT45DB041B-SU datasheet Section 1 and Electrical Characteristics table.
How does the dual-buffer architecture of the AT45DB041B-SU improve system performance?
The AT45DB041B-SU's two independent 264-byte SRAM buffers allow overlapping operations: while one buffer streams incoming data from the host, the other can simultaneously program a page into Flash memory. This concurrency eliminates CPU wait states during reprogramming, enabling continuous data acquisition or firmware patching. This behavior is intrinsic to the AT45DB041B-SU's architecture and documented in Sections 1 and 5.2.6.
What is the purpose of the RDY/BUSY pin on the AT45DB041B-SU?
The RDY/BUSY pin on the AT45DB041B-SU is an open-drain output that goes low during any self-timed operation-including page program, block erase, buffer transfers, and compare operations. It allows the host to poll readiness instead of using fixed delays. The pin returns high when the operation completes, and status register bit 7 mirrors this state. This real-time signaling is essential for deterministic timing in the AT45DB041B-SU.
Can the AT45DB041B-SU be used for EEPROM emulation?
Yes, the AT45DB041B-SU supports EEPROM emulation through a self-contained Read-Modify-Write sequence using its dual buffers. A page is transferred to a buffer, modified byte-by-byte in SRAM, then written back-enabling bit- or byte-level alterations without full-page erasure. This capability is explicitly described in the AT45DB041B-SU datasheet Section 1 and leveraged in application note AN-4.
AT45DB041B-SU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- 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:
- 20 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT45DB041B-SU FAQ
1.How can I place an order for AT45DB041B-SU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB041B-SU 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 AT45DB041B-SU reliable?
The price and inventory of AT45DB041B-SU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB041B-SU is usually 5 days.
3.What payment methods are accepted for AT45DB041B-SU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB041B-SU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB041B-SU?
AT45DB041B-SU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB041B-SU 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 AT45DB041B-SU?
For technical support, including AT45DB041B-SU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB041B-SU requirements.
6.How does Aetrix verify that AT45DB041B-SU is sourced from the original manufacturer or authorized distributors?
All AT45DB041B-SU 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 AT45DB041B-SU meets industry standards.
7.What is the process for return or replacement of AT45DB041B-SU?
All AT45DB041B-SU units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB041B-SU, 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 AT45DB041B-SU part is unused and in its original packaging.
Return procedure for AT45DB041B-SU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB041B-SU Tags
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