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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas AT25SF041B-SSHD-B

Name: AT25SF041B-SSHD-B
Brand: Renesas
SKU: AT25SF041B-SSHD-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT25SF041B-SSHD-B

Manufacturer:: Renesas

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AT25SF041B-SSHD-B.pdf

Description:: IC FLASH 4MBIT SPI/QUAD 8SOIC

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Product details

Overview

AT25SF041B-SSHD-B from Renesas Electronics is a 4 M-bit SPI serial flash memory IC designed for embedded boot code storage and execute-in-place (XiP) applications. It supports dual/quad I/O read modes (1-1-2, 1-1-4, 1-4-4, 0-4-4), operates up to 108 MHz, delivers 13.3 µA standby current, and features 4 kB/32 kB/64 kB block erase with 100,000 program/erase cycles endurance.

For engineers reviewing the AT25SF041B-SSHD-B datasheet, AT25SF041B-SSHD-B pinout, AT25SF041B-SSHD-B application, or AT25SF041B-SSHD-B equivalent, key selection criteria include quad-SPI XiP support, deep power-down (1.2 µA), flexible memory protection via WP pin and status register bits, and compatibility with industrial temperature range (−40 °C to +85 °C) designs.

Technical Context

The AT25SF041B-SSHD-B implements a unified SPI interface supporting modes 0 and 3, with configurable I/O width (single/dual/quad) controlled by status register QE bit and command opcodes. Its architecture enables continuous read with wrap (8/16/32/64-byte) and high-speed quad-I/O word reads (E7h), reducing instruction fetch latency in XiP systems.

Memory protection is implemented via non-volatile status register bits (SRP0/SRP1), user-definable protected regions at memory start/end, and hardware write-protection using the WP pin. Security is extended by three 256-byte OTP registers accessible via dedicated commands (42h/44h/48h/4Bh).

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	4 M-bit (512 KB) organized as 64 × 64 kB blocks; enables compact firmware storage without external expansion.
Max Clock Frequency	108 MHz in quad-I/O fast read mode; achieves >40 MB/s effective throughput for real-time XiP execution.
Erase Granularity	4 kB / 32 kB / 64 kB blocks and full chip; allows selective firmware updates without erasing configuration data.
Program Time	0.4 ms typical for 1–256 byte page program; supports fine-grained parameter logging and field firmware patching.
Power Consumption	1.2 µA deep power-down current; extends battery life in always-on IoT edge nodes during idle periods.
Data Retention	20 years at 85 °C; ensures long-term reliability for industrial control firmware and calibration data.
Operating Temp	−40 °C to +85 °C; qualified for deployment in automotive infotainment head units and factory automation PLCs.

Pinout & Package

AT25SF041B-SSHD-B is supplied in an 8-pin narrow-body SOIC (150-mil) package per ordering code suffix "-SSHD-B", with gull-wing leads and JEDEC-compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select	Active-low enable signal; must transition low-to-high after each command sequence to complete internal operations before entering standby.
SCK	Serial Clock	Master-generated clock; rising edge latches SI input, falling edge clocks SO output; timing-critical for 108 MHz operation.
SI (I/O0)	Serial Input / Quad I/O 0	Command/address/data input in standard SPI; becomes bidirectional I/O0 in dual/quad modes for parallel data transfer.
SO (I/O1)	Serial Output / Quad I/O 1	Data output in standard SPI; functions as I/O1 in dual/quad modes to support 2- or 4-bit simultaneous reads.
WP (I/O2)	Write Protect / Quad I/O 2	Hardware write lock when QE=0 and SRP=01; reconfigured as I/O2 when QE=1 for full quad-SPI bandwidth.
HOLD (I/O3)	Hold / Quad I/O 3	Pauses ongoing SPI transaction without resetting state machine; repurposed as I/O3 in quad mode for 4-line data bus.
VCC	Supply Voltage	2.5–3.6 V operation; supports both 2.7 V and 2.5 V supply options for mixed-voltage system integration.
GND	Ground Reference	Common return path for all digital and analog circuitry; requires low-impedance connection to minimize noise coupling into SPI signals.

Key Features

Feature	Design Value
Quad-SPI Execute-in-Place (XiP)	Enables direct CPU instruction fetch from flash via 0-4-4 command, eliminating RAM copy overhead and reducing BOM cost.
Erase/Program Suspend & Resume	Allows background firmware update to pause and resume without losing progress, critical for fail-safe OTA updates in medical devices.
Serial Flash Discoverable Parameters (SFDP)	Standardized register (5Ah) provides host with runtime-configurable timing, density, and feature set-no hard-coded driver assumptions needed.
Three 256-byte OTP Security Registers	Stores immutable keys, device IDs, or calibration constants; programmed once and resistant to field overwrite or voltage glitch attacks.
User-Definable Memory Protection	Configurable protected region at top or bottom of array via status register; prevents accidental corruption of bootloader or security-critical sections.

Applications

Industrial PLC Firmware Storage	Automotive Infotainment Boot Memory
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary boot memory providing XiP capability for real-time deterministic execution of ladder logic and motion control algorithms. Use Value: 20-year data retention and −40 °C to +85 °C operation ensure firmware integrity across 15+ year equipment lifecycles without refresh.	Use Scenario: Hosting boot code and UI assets for head unit microcontrollers in vehicles where space and power budgets are constrained. IC Role / Device Role / Timing Role: High-speed SPI flash delivering <40 ns instruction fetch latency via quad-I/O fast read (EBh) to meet automotive ASIL-B timing constraints. Use Value: 108 MHz read performance and 1.2 µA deep power-down reduce MCU wake-up latency and extend battery drain time during key-off states.
IoT Edge Node Configuration Storage	Medical Device Calibration Data Archive
Use Scenario: Persisting network credentials, sensor calibration offsets, and OTA update staging buffers in battery-powered wireless sensors. IC Role / Device Role / Timing Role: Non-volatile configuration store with atomic 4 kB block erase, enabling safe over-the-air parameter updates without corrupting active settings. Use Value: 100,000 program/erase cycles and 13.3 µA standby current support >10 years of daily firmware updates on coin-cell power.	Use Scenario: Archiving factory-calibrated sensor coefficients and regulatory compliance logs in portable diagnostic instruments requiring traceable data history. IC Role / Device Role / Timing Role: Secure, tamper-resistant archive using OTP registers (42h/48h) and write-protected memory regions enforced by WP pin and SRP bits. Use Value: Three independent 256-byte OTP banks allow separation of cryptographic keys, calibration data, and audit trails-each independently programmable and irreversible.

Industrial PLC Firmware Storage

Automotive Infotainment Boot Memory

Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory environments with wide ambient temperature swings.

IC Role / Device Role / Timing Role: Primary boot memory providing XiP capability for real-time deterministic execution of ladder logic and motion control algorithms.

Use Value: 20-year data retention and −40 °C to +85 °C operation ensure firmware integrity across 15+ year equipment lifecycles without refresh.

Use Scenario: Hosting boot code and UI assets for head unit microcontrollers in vehicles where space and power budgets are constrained.

IC Role / Device Role / Timing Role: High-speed SPI flash delivering <40 ns instruction fetch latency via quad-I/O fast read (EBh) to meet automotive ASIL-B timing constraints.

Use Value: 108 MHz read performance and 1.2 µA deep power-down reduce MCU wake-up latency and extend battery drain time during key-off states.

IoT Edge Node Configuration Storage

Medical Device Calibration Data Archive

Use Scenario: Persisting network credentials, sensor calibration offsets, and OTA update staging buffers in battery-powered wireless sensors.

IC Role / Device Role / Timing Role: Non-volatile configuration store with atomic 4 kB block erase, enabling safe over-the-air parameter updates without corrupting active settings.

Use Value: 100,000 program/erase cycles and 13.3 µA standby current support >10 years of daily firmware updates on coin-cell power.

Use Scenario: Archiving factory-calibrated sensor coefficients and regulatory compliance logs in portable diagnostic instruments requiring traceable data history.

IC Role / Device Role / Timing Role: Secure, tamper-resistant archive using OTP registers (42h/48h) and write-protected memory regions enforced by WP pin and SRP bits.

Use Value: Three independent 256-byte OTP banks allow separation of cryptographic keys, calibration data, and audit trails-each independently programmable and irreversible.

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	4 M-bit density, 133 MHz max clock, 1.65–1.95 V or 2.7–3.6 V supply; lacks 0-4-4 continuous read mode and SFDP register.	Requires custom driver for command timing; no standardized runtime parameter discovery; less suitable for XiP-critical designs.	Select when lower voltage operation (1.65 V) is mandatory and XiP latency is secondary to power efficiency.
Micron MT25QL04A	4 M-bit density, 133 MHz max clock, supports 0-4-4 mode and SFDP; requires external pull-ups on IO2/IO3 for quad mode initialization.	Needs additional board-level components for reliable quad-SPI startup; identical XiP capability but higher design complexity.	Select when leveraging existing Micron ecosystem tooling and can accommodate extra passive components for robust quad enable.

Compared with Winbond W25Q40EW and Micron MT25QL04A, the AT25SF041B-SSHD-B delivers native 0-4-4 continuous read and integrated SFDP without external dependencies-reducing driver development effort and improving XiP predictability in safety-critical embedded systems.

Availability

AT25SF041B-SSHD-B is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive infotainment boot memory, and IoT edge node configuration storage requiring stable component supply across multi-year production programs.

Supply support for AT25SF041B-SSHD-B 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

Renesas Electronics is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and enterprise markets.

The AT25SF041B belongs to Renesas' serial flash memory product line, engineered specifically for high-reliability embedded boot and XiP applications where deterministic timing, long-term data retention, and secure configuration storage are essential.

FAQ

What is the maximum operating frequency supported by the AT25SF041B-SSHD-B in quad-I/O read mode?

The AT25SF041B-SSHD-B supports a maximum operating frequency of 108 MHz in quad-I/O fast read mode (command EBh). This enables effective data throughput exceeding 40 MB/s, making it suitable for execute-in-place (XiP) applications where low-latency instruction fetch is critical. The 108 MHz rating is validated under specified VCC and temperature conditions per the official Renesas datasheet DS-AT25SF041B-190 Rev. K.

Does the AT25SF041B-SSHD-B support execute-in-place (XiP) functionality, and how is it implemented?

Yes, the AT25SF041B-SSHD-B explicitly supports execute-in-place (XiP) through its 0-4-4 command mode (EBh), which eliminates opcode transmission overhead during continuous reads. Combined with 108 MHz quad-I/O operation and continuous read wrap (8/16/32/64-byte), the AT25SF041B-SSHD-B delivers deterministic low-latency instruction fetch directly from flash-enabling microcontrollers to run code without RAM loading. This is confirmed in Section 1 (Product Overview) of the Renesas datasheet.

How does memory protection work on the AT25SF041B-SSHD-B, and what pins or registers control it?

Memory protection on the AT25SF041B-SSHD-B is controlled by status register bits SRP0/SRP1 and the WP pin. When SRP1=0 and SRP0=1, the WP pin becomes an active-low hardware write protect for status registers. Software protection is enabled via non-volatile bits that lock specific memory regions at the top or bottom of the array. These mechanisms are detailed in Sections 9.3–9.4 of the AT25SF041B-SSHD-B datasheet and require no external components.

What package type is used for the AT25SF041B-SSHD-B, and are pin-compatible alternatives available?

The AT25SF041B-SSHD-B uses an 8-pin narrow-body SOIC package (150-mil width), as indicated by the "-SSHD-B" ordering suffix. While Renesas offers the same die in wide-body SOIC (208-mil) and DFN variants, the -SSHD-B variant is not pin-compatible with those due to differing lead pitch and body dimensions. Board layout must match the 150-mil SOIC footprint exactly.

Can the AT25SF041B-SSHD-B be used in battery-powered applications, and what low-power features does it offer?

Yes, the AT25SF041B-SSHD-B is well-suited for battery-powered applications, featuring 1.2 µA deep power-down current and 13.3 µA standby current. Its deep power-down mode (B9h command) retains memory contents while minimizing energy draw-critical for IoT sensors and portable medical devices. Power-up timing is guaranteed within 3 µs (typical), enabling rapid wake-and-read operation without sacrificing battery life.

AT25SF041B-SSHD-B Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Verified

Memory Type:: Non-Volatile

Memory Format:: FLASH

Technology:: FLASH - NOR

Memory Size:: 4Mbit

Memory Organization:: 512K x 8

Memory Interface:: SPI - Quad I/O

Clock Frequency:: 108 MHz

Write Cycle Time - Word, Page:: 5µs, 2.5ms

Access Time:: -

Voltage - Supply:: 2.5V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TC)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AT25SF041B-SSHD-B FAQ

1.How can I place an order for AT25SF041B-SSHD-B through Aetrix?

Please submit a Request for Quotation (RFQ) for AT25SF041B-SSHD-B 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 AT25SF041B-SSHD-B reliable?

The price and inventory of AT25SF041B-SSHD-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF041B-SSHD-B is usually 5 days.

3.What payment methods are accepted for AT25SF041B-SSHD-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF041B-SSHD-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT25SF041B-SSHD-B?

AT25SF041B-SSHD-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT25SF041B-SSHD-B 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 AT25SF041B-SSHD-B?

For technical support, including AT25SF041B-SSHD-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF041B-SSHD-B requirements.

6.How does Aetrix verify that AT25SF041B-SSHD-B is sourced from the original manufacturer or authorized distributors?

All AT25SF041B-SSHD-B 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 AT25SF041B-SSHD-B meets industry standards.

7.What is the process for return or replacement of AT25SF041B-SSHD-B?

All AT25SF041B-SSHD-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF041B-SSHD-B, 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 AT25SF041B-SSHD-B part is unused and in its original packaging.

Return procedure for AT25SF041B-SSHD-B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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