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Renesas AT25SF161B-SSHB-B
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- Part No.:
- AT25SF161B-SSHB-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25SF161B-SSHB-B.pdf
- Description:
- IC FLASH 16MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,644
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Product details
Overview
AT25SF161B-SSHB-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 quad output (1-1-4) modes, operates up to 108 MHz, features 4 kB/32 kB/64 kB block erase (50/120/200 ms typ), and delivers 15 µA standby current - enabling fast, low-power firmware storage in industrial controllers and IoT edge devices.
For engineers reviewing the AT25SF161B-SSHB-B datasheet, AT25SF161B-SSHB-B pinout, AT25SF161B-SSHB-B application, or AT25SF161B-SSHB-B equivalent, this page provides verified pin functions, real-world XiP timing behavior, confirmed erase/program cycle endurance (100,000 cycles), OTP security register usage, and JEDEC SFDP-compliant configuration - all critical for bootloader reliability and secure firmware update design.
Technical Context
The AT25SF161B-SSHB-B implements a flexible SPI interface supporting modes 0 and 3, with configurable I/O width (1-, 2-, or 4-line) controlled via status register bits and command opcodes (e.g., 03h, 3Bh, BBh, EBh). Its memory array uses 4 kB uniform sectors and hierarchical block architecture (4/32/64 kB), enabling selective code/data erasure without full-chip reset.
Internal logic includes dedicated SRAM data buffer, Y-gating decoder, and protection control that enforces write lock via WP pin or status register bits (SRP0/SRP1/CMP). Quad-enable (QE) bit in Status Register 2 determines whether WP/HOLD pins function as I/O lines (I/O2/I/O3) or hardware protection inputs - a mode-dependent role requiring explicit register configuration before use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2 MB) - sufficient for full MCU boot images and application firmware in space-constrained designs. |
| Max Clock Frequency | 108 MHz - enables sub-100 ns effective read access time in quad I/O mode, critical for XiP latency budgets. |
| Erase Granularity | 4 kB / 32 kB / 64 kB blocks and full chip - allows targeted firmware patching without disrupting adjacent code sections. |
| Program Time | 0.4 ms typical per page (up to 256 bytes) - supports rapid field updates while minimizing system downtime. |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - meets industrial lifecycle requirements for unattended operation. |
| Power Consumption | 15 µA standby; 1.5 µA deep power-down - extends battery life in always-on sensor nodes and portable equipment. |
| Security Features | 3 × 256-byte OTP registers + SFDP support - enables immutable key storage and standardized parameter discovery for automated toolchains. |
Pinout & Package
AT25SF161B-SSHB-B is packaged in an 8-lead SOIC (0.150" narrow body), with lead finish RoHS-compliant and halide-free. 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 - all pins support dual/quad I/O functionality depending on QE bit state and active command.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable; must transition high-to-low to initiate any command and low-to-high to terminate - controls device selection and standby entry timing. |
| SCK | Serial clock input | Drives all timing; rising edge latches SI data, falling edge clocks SO data - defines maximum 108 MHz interface speed in quad mode. |
| SI (I/O0) | Serial input / quad I/O line 0 | Primary command/address/data input; becomes bidirectional I/O0 during dual/quad reads - requires pull-up if unused in quad mode. |
| SO (I/O1) | Serial output / quad I/O line 1 | Default data output; functions as I/O1 in dual/quad operations - high-impedance when CS is deasserted to prevent bus contention. |
| WP (I/O2) | Write protect / quad I/O line 2 | Hardware write lock when QE=0 and SRP bits set; serves as I/O2 in quad commands when QE=1 - cannot be used for both roles simultaneously. |
| HOLD (I/O3) | Communication hold / quad I/O line 3 | Pauses ongoing SPI transfer without resetting SCK phase; acts as I/O3 in quad mode - requires SCK low during hold assertion/deassertion. |
| VCC | Supply voltage | 2.5–3.6 V operation - compatible with modern low-voltage MCUs and eliminates need for level-shifting in 3.3 V systems. |
| GND | Ground reference | Common return path for all signals and power - must be low-impedance and directly connected to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Quad I/O and XiP Support | Enables 0-4-4 continuous read mode with no opcode overhead, reducing instruction fetch latency by >40% vs standard SPI in embedded boot scenarios. |
| Erase/Program Suspend | Allows background erase or program to be paused for urgent read requests - essential for real-time systems requiring deterministic response times. |
| User-Definable Memory Protection | Configurable protected region at memory start or end via CMP bit, enforced by WP pin or status register - prevents accidental overwrite of bootloader or calibration data. |
| JEDEC SFDP Compliance | Provides standardized, software-readable parameter table (5Ah command) - simplifies driver development and enables automatic configuration across host platforms. |
| OTP Security Registers | Three 256-byte one-time programmable areas store cryptographic keys or device-specific secrets - physically irreversible and immune to software overwrite. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Device Boot Memory |
|---|---|
|
Use Scenario: Storing and executing ladder logic firmware in programmable logic controllers with zero external RAM dependency. IC Role / Device Role / Timing Role: Primary boot memory providing XiP execution directly from flash, using 1-4-4 quad I/O mode for <100 ns instruction fetch latency. Use Value: Eliminates external RAM requirement and reduces BOM cost while maintaining deterministic real-time response under temperature stress (-40°C to 85°C). |
Use Scenario: Secure firmware storage and over-the-air (OTA) update staging in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Dual-role memory holding active firmware (protected region) and OTA payload (unprotected region), managed via block-erase granularity. Use Value: Enables atomic firmware swap with 4 kB sector erase (50 ms typ), minimizing downtime and preserving runtime data during update. |
| Medical Diagnostic Instrument Code Storage | Automotive Infotainment System Configuration |
|
Use Scenario: Hosting diagnostic algorithm binaries and calibration tables in portable ultrasound units requiring FDA-grade data integrity. IC Role / Device Role / Timing Role: Nonvolatile code storage with 20-year retention and 100,000-cycle endurance, secured via OTP registers for device identity keys. Use Value: Meets IEC 62304 software lifecycle requirements through verifiable write-protection, SFDP-based versioning, and traceable erase history. |
Use Scenario: Storing UI assets, voice recognition models, and vehicle-specific configuration profiles in head unit modules. IC Role / Device Role / Timing Role: High-bandwidth quad I/O flash interfaced to ARM Cortex-A application processor, leveraging continuous read mode for smooth GUI rendering. Use Value: Delivers 4× throughput vs standard SPI (108 MHz × 4 bits), enabling 60 fps UI refresh without frame drops or stutter. |
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 | 16 Mbit density, 133 MHz max clock, 1.65–3.6 V supply - higher speed but wider voltage range; lacks OTP registers and SFDP v1.6 compliance. | Preferred where ultra-fast read performance is prioritized over secure key storage; not suitable for designs requiring JEDEC-standardized parameter discovery. | Select W25Q16JW only if 133 MHz timing margin is required and OTP/SFDP features are unused in the system architecture. |
| Micron MT25QL128ABA | 128 Mbit density, 133 MHz, 2.7–3.6 V - larger capacity and faster clock, but no 2.5 V operation support and no integrated OTP security registers. | Better suited for complex infotainment systems needing large asset storage; incompatible with 2.5 V host interfaces and lacks hardware-enforced key storage. | Choose MT25QL128ABA when scaling beyond 16 Mbit is needed and 2.5 V compatibility or OTP security are not design constraints. |
Compared with W25Q16JW and MT25QL128ABA, the AT25SF161B-SSHB-B uniquely balances 2.5 V compatibility, OTP-based security, and SFDP v1.6 compliance - making it optimal for resource-constrained, safety-aware embedded systems where firmware integrity and voltage flexibility are non-negotiable.
Availability
AT25SF161B-SSHB-B is available at Aetrix Electronics and suitable for industrial PLCs, IoT edge gateways, medical diagnostic instruments, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT25SF161B-SSHB-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 - with emphasis on functional safety and long-term reliability.
The AT25SF161B belongs to Renesas' serial flash memory product line, engineered specifically for embedded boot code storage and execute-in-place operation in harsh environments - combining low-power operation, robust erase/write endurance, and hardware-level security features.
FAQ
What is the operating voltage range for the AT25SF161B-SSHB-B?
The AT25SF161B-SSHB-B supports two supply voltage ranges: 2.5 V to 3.6 V and 2.7 V to 3.6 V. This dual-voltage capability ensures compatibility with both legacy 2.5 V logic families and modern 3.3 V systems, eliminating level-shifters in mixed-voltage designs and simplifying power architecture for the AT25SF161B-SSHB-B.
Does the AT25SF161B-SSHB-B support execute-in-place (XiP) operation?
Yes, the AT25SF161B-SSHB-B explicitly supports XiP via quad I/O (1-4-4) and continuous read (0-4-4) modes, which eliminate command overhead and deliver sustained high bandwidth. The AT25SF161B-SSHB-B achieves this through hardware-accelerated burst addressing and internal prefetch buffers - enabling direct CPU instruction fetch without external RAM buffering.
How many and what type of security registers does the AT25SF161B-SSHB-B include?
The AT25SF161B-SSHB-B includes three 256-byte One-Time Programmable (OTP) security registers. These registers are physically irreversible after programming and are used to store cryptographic keys, device identifiers, or calibration secrets. Access is controlled via dedicated commands (42h/44h/48h), and the AT25SF161B-SSHB-B guarantees retention for 20 years under specified operating conditions.
What package type is used for the AT25SF161B-SSHB-B?
The AT25SF161B-SSHB-B uses an 8-lead SOIC package with 0.150-inch narrow body (also referenced as "SSHB-B" in Renesas ordering nomenclature). It features gull-wing leads, RoHS-compliant matte tin finish, and is rated for industrial temperature range (-40°C to +85°C). This package is pin-compatible with industry-standard 8-SOIC footprints and supports reflow soldering per J-STD-020.
Can the WP and HOLD pins on the AT25SF161B-SSHB-B be used simultaneously as I/O lines?
No - the WP and HOLD pins on the AT25SF161B-SSHB-B serve dual roles but cannot operate as I/O lines simultaneously in the same command sequence. When Quad Enable (QE) = 1, both become I/O2 and I/O3 respectively for quad operations; when QE = 0, they revert to write-protect and hold functions. The AT25SF161B-SSHB-B requires explicit status register configuration before switching modes.
AT25SF161B-SSHB-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 108 MHz
- Write Cycle Time - Word, Page:
- 50µs, 2.4ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25SF161B-SSHB-B FAQ
1.How can I place an order for AT25SF161B-SSHB-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF161B-SSHB-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 AT25SF161B-SSHB-B reliable?
The price and inventory of AT25SF161B-SSHB-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF161B-SSHB-B is usually 5 days.
3.What payment methods are accepted for AT25SF161B-SSHB-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF161B-SSHB-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF161B-SSHB-B?
AT25SF161B-SSHB-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF161B-SSHB-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 AT25SF161B-SSHB-B?
For technical support, including AT25SF161B-SSHB-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF161B-SSHB-B requirements.
6.How does Aetrix verify that AT25SF161B-SSHB-B is sourced from the original manufacturer or authorized distributors?
All AT25SF161B-SSHB-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 AT25SF161B-SSHB-B meets industry standards.
7.What is the process for return or replacement of AT25SF161B-SSHB-B?
All AT25SF161B-SSHB-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF161B-SSHB-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 AT25SF161B-SSHB-B part is unused and in its original packaging.
Return procedure for AT25SF161B-SSHB-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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