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Renesas AT25SF161-SHD-B
- Part No.:
- AT25SF161-SHD-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF161-SHD-B.pdf
- Description:
- IC FLASH 16MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,647
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Product details
Overview
AT25SF161-SHD-B from Renesas Electronics is a 16-Mbit SPI serial flash memory IC designed for embedded boot code and XiP (execute-in-place) applications. It supports dual I/O (1-2-2), quad I/O (1-4-4, 0-4-4), and standard SPI modes 0/3, operates up to 108 MHz, and delivers fast read performance with continuous wrap modes. Its 2.7–3.6 V supply, 15 µA standby current, and -40°C to +85°C industrial temperature range make it suitable for space-constrained, low-power IoT edge nodes and industrial controllers.
For engineers reviewing the AT25SF161-SHD-B datasheet, AT25SF161-SHD-B pinout, AT25SF161-SHD-B application, or AT25SF161-SHD-B equivalent, key selection criteria include quad-SPI XiP capability, flexible 4/32/64 kB erase granularity, OTP security registers, SFDP compliance, and SOIC narrow (0.150") package compatibility with legacy PCB footprints.
Technical Context
The AT25SF161-SHD-B implements a unified SPI interface supporting command-mode switching between single/dual/quad I/O protocols without hardware reconfiguration. Its internal architecture includes a 256-byte page buffer, Y-gated flash array with 4 kbyte erase blocks, and triple status registers enabling independent control of write protection, quad enable, and volatile/non-volatile configuration.
It features hardware-assisted XiP acceleration via 0-4-4 continuous read mode (eliminating opcode overhead) and supports program/erase suspend/resume for real-time system responsiveness. Memory protection is enforced through user-definable sectors at array start/end, controlled by WP pin or status register bits SRP1/SRP0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2 MB) - sufficient for full firmware images in mid-tier microcontrollers and secure boot loaders. |
| Max Clock Frequency | 108 MHz - enables 54 MB/s quad-I/O read throughput for responsive XiP execution. |
| Erase Granularity | 4 kB / 32 kB / 64 kB blocks - allows fine-grained firmware updates without erasing entire application sections. |
| Page Program Time | 0.4 ms typical - supports rapid field firmware patching with minimal host CPU blocking. |
| Endurance & Retention | 100,000 P/E cycles / 20 years data retention - meets industrial lifecycle requirements for unattended equipment. |
| Power Consumption | 1.5 µA deep power-down - extends battery life in always-on sensor nodes during idle periods. |
| Operating Voltage | 2.7–3.6 V - compatible with 3.3 V logic systems and tolerant of brown-out conditions down to 2.7 V. |
Pinout & Package
AT25SF161-SHD-B is packaged in an 8-lead SOIC (0.150" narrow body), RoHS-compliant, surface-mount package with standard JEDEC footprint. Pin 1 is CS (chip select), Pin 2 is SO/I/O1, Pin 3 is WP/I/O2, Pin 4 is GND, Pin 5 is VCC, Pin 6 is HOLD/I/O3, Pin 7 is SCK, and Pin 8 is SI/I/O0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high-to-low to initiate any operation and low-to-high to terminate; requires external 10 kΩ pull-up to VCC for reliable power-up sequencing. |
| SCK | Serial Clock | Input clock driving all SPI transactions; rising edge latches input data (SI), falling edge clocks output data (SO). |
| SI (I/O0) | Serial Input / Quad I/O 0 | Primary command/address/data input; becomes bidirectional I/O0 during dual/quad I/O reads for parallel bit transfer. |
| SO (I/O1) | Serial Output / Quad I/O 1 | Primary data output; becomes bidirectional I/O1 during dual/quad I/O reads; high-impedance when CS is deasserted. |
| WP (I/O2) | Write Protect / Quad I/O 2 | Configurable as hardware write-protection input (when QE = 0) or quad I/O line (when QE = 1); internally pulled high. |
| HOLD (I/O3) | Hold / Quad I/O 3 | Pauses ongoing SPI transfer without resetting state (when QE = 0); serves as quad I/O line (I/O3) when QE = 1; internally pulled high. |
Key Features
| Feature | Design Value |
|---|---|
| Quad I/O with XiP Support | Enables direct code execution from flash using 0-4-4 continuous read mode, eliminating opcode overhead and reducing latency by >30% vs standard SPI reads. |
| Three 256-byte OTP Security Registers | Provides immutable storage for cryptographic keys, device IDs, or calibration data-programmable once and resistant to overwrite or readback after locking. |
| Serial Flash Discoverable Parameters (SFDP) | Allows host MCU to auto-detect memory geometry, timing parameters, and command sets at runtime-simplifying firmware portability across flash vendors. |
| Erase/Program Suspend & Resume | Permits interruption of long-running erase (up to 5.5 s) or program operations to service higher-priority interrupts, then resume without data loss or timing recalibration. |
| User-Definable Memory Protection | Supports lock/unlock of top or bottom sectors (configurable via status register or WP pin), preventing accidental corruption of bootloader or critical configuration data. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Node Boot Memory |
|---|---|
Use Scenario: Storing and executing ladder logic firmware in programmable logic controllers with periodic over-the-air updates. IC Role / Device Role / Timing Role: Primary non-volatile boot memory providing XiP execution and atomic 4 kB sector updates to maintain deterministic scan cycle timing. Use Value: 108 MHz quad-I/O read speed ensures sub-100 ns instruction fetch latency; 4 kB erase granularity enables safe partial firmware upgrades without halting machine operation. | Use Scenario: Hosting secure boot loader and sensor fusion firmware in battery-powered wireless sensor nodes deployed in remote locations. IC Role / Device Role / Timing Role: Trusted execution environment anchor with OTP-stored root keys and SFDP-enabled runtime configuration adaptation. Use Value: 1.5 µA deep power-down current extends 10-year battery life; three OTP registers securely bind firmware to hardware identity. |
| Medical Diagnostic Device Code Storage | Automotive ADAS Camera Module |
Use Scenario: Storing FDA-cleared diagnostic algorithms and calibration tables in portable ultrasound or ECG devices requiring traceable firmware revisions. IC Role / Device Role / Timing Role: Certified code repository with write-protection enforcement and 20-year data retention for regulatory compliance documentation. Use Value: User-definable protection zones prevent unauthorized modification of clinical algorithms; 100,000 P/E cycles support lifetime field calibration updates. | Use Scenario: Storing camera ISP firmware and neural network inference models in automotive surround-view systems operating under extended temperature stress. IC Role / Device Role / Timing Role: High-reliability flash memory qualified for -40°C to +85°C operation with robust ECC and suspend/resume for real-time image processing pipelines. Use Value: Industrial temperature rating ensures stable operation during engine bay thermal cycling; suspend/resume avoids frame drops during concurrent firmware update and video capture. |
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 W25Q16JW-QA | Same density (16 Mbit), 133 MHz max clock, 1.65–3.6 V supply, DFN/WLCSP only - no SOIC option. | Lacks 0.150" SOIC package; requires PCB redesign if replacing AT25SF161-SHD-B in legacy designs. | Select when higher clock speed and ultra-low power (0.5 µA deep power-down) are prioritized over SOIC compatibility. |
| Macronix MX25L1633FZBI-10G | 16 Mbit, 104 MHz max clock, 2.7–3.6 V, supports SOIC narrow but lacks SFDP and OTP registers. | No SFDP auto-discovery or hardware OTP - increases firmware development effort for multi-vendor support and key management. | Select for cost-sensitive industrial applications where XiP acceleration and cryptographic binding are not required. |
Compared with W25Q16JW-QA and MX25L1633FZBI-10G, the AT25SF161-SHD-B uniquely combines SOIC narrow package compatibility, SFDP compliance, OTP security registers, and 0-4-4 XiP mode - making it optimal for upgrading legacy designs with enhanced security and boot performance without layout changes.
Availability
AT25SF161-SHD-B is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, and automotive ADAS modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AT25SF161-SHD-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 global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.
The AT25SF161-SHD-B belongs to Renesas' AT25SF family of SPI flash memories engineered for high-reliability embedded boot and XiP applications demanding security, low power, and industrial temperature operation.
FAQ
What is the maximum SPI clock frequency supported by the AT25SF161-SHD-B?
The AT25SF161-SHD-B supports a maximum SPI clock frequency of 108 MHz in quad I/O (1-4-4) and quad output (1-1-4) modes. This enables sustained read throughput of up to 54 MB/s, critical for execute-in-place (XiP) performance in resource-constrained microcontrollers. The 108 MHz rating is specified under 2.7–3.6 V supply and -40°C to +85°C operating conditions per the official Renesas DS-AT25SF161B-188 Rev. H datasheet.
Does the AT25SF161-SHD-B support execute-in-place (XiP) functionality?
Yes, the AT25SF161-SHD-B explicitly supports XiP through its 0-4-4 continuous read mode, which eliminates the need to send repeated command opcodes during sequential instruction fetches. Combined with 108 MHz quad-I/O operation and low-latency access, this enables deterministic code execution directly from flash memory - a key requirement for bootloaders and real-time embedded applications. The feature is documented in Section 1 (Product Overview) of the AT25SF161-SHD-B datasheet.
How many One-Time Programmable (OTP) security registers does the AT25SF161-SHD-B include?
The AT25SF161-SHD-B includes three 256-byte One-Time Programmable (OTP) security registers, accessible via dedicated commands (42h program, 48h read, 44h erase). These registers provide tamper-resistant storage for cryptographic keys, unique device identifiers, or calibration data - programmable once and permanently locked against further writes. Their existence and command set are fully detailed in Section 10 of the AT25SF161-SHD-B datasheet.
What package type is used for the AT25SF161-SHD-B?
The AT25SF161-SHD-B uses an 8-lead SOIC package with 0.150" narrow body (JEDEC MS-012), as confirmed by Renesas ordering information (DS-AT25SF161B-188 Rev. H, Section 15.1). This package is pin-compatible with legacy SPI flash devices and supports standard reflow soldering processes. Pin 1 is CS, Pin 4 is GND, Pin 5 is VCC, and Pin 8 is SI/I/O0 - matching industry-standard SOIC-8 layouts.
Can the AT25SF161-SHD-B be used in automotive applications?
The AT25SF161-SHD-B is rated for industrial temperature range (-40°C to +85°C) and meets RoHS compliance, but it is not AEC-Q100 qualified. While it may function in certain automotive cabin or ADAS camera modules operating within its temperature and reliability specifications, Renesas does not certify it for safety-critical automotive applications such as powertrain or braking systems. For automotive-grade use, consult Renesas' AEC-Q100 qualified flash portfolio or validate qualification status directly with Renesas support before design-in.
AT25SF161-SHD-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- 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 - NOR
- Memory Size:
- 16Mbit
- Memory Organization:
- 2M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 5µs, 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
AT25SF161-SHD-B FAQ
1.How can I place an order for AT25SF161-SHD-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF161-SHD-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 AT25SF161-SHD-B reliable?
The price and inventory of AT25SF161-SHD-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF161-SHD-B is usually 5 days.
3.What payment methods are accepted for AT25SF161-SHD-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF161-SHD-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF161-SHD-B?
AT25SF161-SHD-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF161-SHD-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 AT25SF161-SHD-B?
For technical support, including AT25SF161-SHD-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF161-SHD-B requirements.
6.How does Aetrix verify that AT25SF161-SHD-B is sourced from the original manufacturer or authorized distributors?
All AT25SF161-SHD-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 AT25SF161-SHD-B meets industry standards.
7.What is the process for return or replacement of AT25SF161-SHD-B?
All AT25SF161-SHD-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF161-SHD-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 AT25SF161-SHD-B part is unused and in its original packaging.
Return procedure for AT25SF161-SHD-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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