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Renesas AT25SF128A-SHB-Y
- Part No.:
- AT25SF128A-SHB-Y
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF128A-SHB-Y.pdf
- Description:
- IC FLASH 128MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,992
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Product details
Overview
AT25SF128A-SHB-Y from Renesas Electronics is a 128-Mbit Serial NOR Flash memory IC supporting SPI modes 0/3, dual I/O (1-1-2), and quad I/O (1-4-4, 0-4-4) for high-speed code storage and eXecute-in-Place (XiP) in embedded microcontrollers. It operates from 2.7 V to 3.6 V, delivers up to 133 MHz read speed at 85 °C, and features 4 kB/32 kB/64 kB block erase with typical times of 70 ms / 150 ms / 250 ms.
For engineers reviewing the AT25SF128A-SHB-Y datasheet, AT25SF128A-SHB-Y pinout, AT25SF128A-SHB-Y application, or AT25SF128A-SHB-Y equivalent, key selection criteria include XiP-optimized continuous read mode, configurable I/O drive strength, OTP security registers, SFDP compliance, and industrial temperature support (–40 °C to +85 °C).
Technical Context
The AT25SF128A-SHB-Y implements a standard SPI interface with four dedicated pins (CS, SCK, SI/I/O0, SO/I/O1) and two multifunction pins (WP/I/O2, HOLD/I/O3) that reconfigure as quad I/O lines when the non-volatile Quad Enable (QE) bit in Status Register 2 is set. Factory default QE = 0 enables WP/HOLD functionality; QE = 1 enables quad I/O operation.
It supports hierarchical erase architecture (4 kB, 32 kB, 64 kB blocks, full chip), page programming (1–256 bytes), and suspend/resume for erase/program operations. Memory protection includes user-definable protected regions and hardware write protection via the WP pin, while three 256-byte OTP security registers provide immutable device identity and configuration storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 128 Mbit (16 MB) - sufficient for firmware images, boot loaders, and configuration data in resource-constrained systems. |
| Interface Protocol | SPI with dual I/O (1-1-2) and quad I/O (1-4-4, 0-4-4) - enables 2× or 4× throughput vs. standard SPI, critical for XiP latency reduction. |
| Max Read Speed | 133 MHz at 85 °C - supports sub-10 ns effective access time in continuous read mode for real-time code execution. |
| Erase Time (4 kB) | 70 ms typical - enables fast field firmware updates without excessive downtime in industrial controllers. |
| Endurance | 100,000 program/erase cycles - ensures long-term reliability in applications requiring frequent parameter or log updates. |
| Data Retention | 20 years at 85 °C - guarantees firmware integrity over full product lifecycle in harsh thermal environments. |
| Supply Voltage | 2.7 V to 3.6 V - compatible with common 3.3 V logic rails and tolerant of brown-out conditions in battery-backed systems. |
Pinout & Package
AT25SF128A-SHB-Y is supplied in an 8-pad W-SOIC (208-mil) package per ordering code suffix "-SHB-Y", with pin 1 marked by a notch or dot. The package is RoHS-compliant, Pb-free, and halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable signal; must fall before any command; internal pull-up not present - requires external 10 kΩ pull-up to VCC for robust power-up sequencing. |
| SCK | Serial clock input | Master-generated clock; all commands and data latched on rising edge; output data valid after falling edge. |
| SI (I/O0) | Serial input / quad I/O line 0 | Command/address/data input in standard/dual mode; bidirectional I/O0 in quad mode; latched on SCK rising edge. |
| SO (I/O1) | Serial output / quad I/O line 1 | Data output in standard/dual mode; bidirectional I/O1 in quad mode; data shifts out on SCK falling edge. |
| WP (I/O2) | Write protect / quad I/O line 2 | Hardware write lock for status registers when QE = 0; becomes I/O2 in quad mode when QE = 1; internally pulled high - can float if unused. |
| HOLD (I/O3) | Hold input / quad I/O line 3 | Pauses ongoing SPI transfer without resetting state when QE = 0; becomes I/O3 in quad mode when QE = 1; internally pulled high - can float if unused. |
| VCC | Power supply | Single 2.7–3.6 V supply for core and I/O; requires local 0.1–1 µF low-ESR decoupling capacitor adjacent to pin. |
| GND | Ground reference | Return path for VCC; must be low-impedance and routed with minimal loop area to reduce noise coupling into SPI signals. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous Read Mode (0-4-4) | Eliminates opcode transmission overhead, enabling sustained high-bandwidth XiP with wrap lengths of 8/16/32/64 bytes. |
| Serial Flash Discoverable Parameters (SFDP) | Enables automatic host configuration of timing, voltage, and command sets without hard-coded driver dependencies. |
| Three 256-byte OTP Security Registers | Provide immutable storage for cryptographic keys, device serial numbers, or calibration data - resistant to overwrite or erase. |
| User-Configurable I/O Drive Strength | Adjusts output current via DRV1/DRV0 bits to match PCB trace impedance and reduce EMI in high-speed quad I/O operation. |
| Erase/Program Suspend & Resume | Allows interruption of long-duration flash operations to service higher-priority host tasks, then resume without data loss or timing penalty. |
Applications
| Industrial PLC Firmware Storage | Automotive ADAS Boot Memory |
|---|---|
Use Scenario: Storing firmware and configuration tables for programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with eXecute-in-Place capability, delivering deterministic instruction fetch timing under real-time constraints. Use Value: 133 MHz read speed and continuous read mode reduce CPU wait states during boot and runtime code execution, improving system responsiveness. | Use Scenario: Holding boot firmware and safety-critical sensor calibration data in automotive Advanced Driver Assistance Systems (ADAS) ECUs certified to AEC-Q100 Grade 3. IC Role / Device Role / Timing Role: Primary boot memory with guaranteed 20-year data retention at 85 °C and hardware write protection for immutable safety parameters. Use Value: OTP security registers store unique device identifiers and cryptographic keys, meeting ISO 21434 cybersecurity requirements for secure boot chain integrity. |
| Medical Imaging Device Configuration | Smart Energy Meter Firmware |
Use Scenario: Storing image processing algorithms, calibration profiles, and regulatory compliance logs in portable ultrasound and X-ray equipment requiring FDA 21 CFR Part 11 audit trails. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with user-definable protected zones for regulatory-critical data segments. Use Value: Hardware-based WP pin and status register protection prevent unauthorized modification of calibration data during field servicing or software updates. | Use Scenario: Hosting firmware, tariff tables, and encrypted metering history in ANSI C12.22-compliant smart electricity meters deployed in utility substations and residential endpoints. IC Role / Device Role / Timing Role: High-reliability flash memory supporting 100,000+ program/erase cycles for daily firmware patching and usage log rotation. Use Value: Deep power-down current of 2 µA extends battery life in backup-powered meters during grid outages without compromising data retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Serial NOR Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q128JVSIM | Same density (128 Mbit), quad I/O, 3.3 V supply; lacks OTP registers and SFDP v1.6 support; max read speed 104 MHz at 85 °C. | Lower read bandwidth limits XiP performance in latency-sensitive applications; no built-in security registers require external key management. | Select when cost sensitivity outweighs need for OTP security or SFDP auto-configuration. |
| Macronix MX25L12833FZDI-10G | 128 Mbit, quad I/O, 3.3 V; supports 133 MHz read but only with 1-1-4 (not 0-4-4); no OTP registers; deep power-down current 3 µA (vs. 2 µA). | Missing 0-4-4 continuous read mode increases instruction fetch latency; higher deep power-down current reduces battery backup duration. | Select when legacy driver compatibility with standard quad commands is prioritized over XiP optimization. |
Compared with W25Q128JVSIM and MX25L12833FZDI-10G, the AT25SF128A-SHB-Y uniquely combines 133 MHz 0-4-4 continuous read, integrated OTP security, and SFDP v1.6 - making it optimal for secure, high-performance XiP implementations where deterministic latency and firmware integrity are mandatory.
Availability
AT25SF128A-SHB-Y is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS, medical imaging, and smart energy metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT25SF128A-SHB-Y 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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
The AT25SF128A belongs to Renesas' Serial NOR Flash product line, engineered specifically for high-reliability, high-speed code storage and eXecute-in-Place applications in thermally demanding and safety-critical embedded systems.
FAQ
What is the factory default Quad Enable (QE) state for AT25SF128A-SHB-Y?
The AT25SF128A-SHB-Y ships with the Quad Enable (QE) bit in Status Register 2 set to 0, meaning WP and HOLD pins function as hardware write protect and hold inputs by default-not as quad I/O lines. This differs from the AT25QF128A variant, which ships with QE = 1. To enable quad I/O, the QE bit must be explicitly programmed via Write Status Register command.
Does AT25SF128A-SHB-Y support Execute-in-Place (XiP) operation?
Yes, AT25SF128A-SHB-Y is explicitly designed for XiP with features including continuous read mode (0-4-4), high 133 MHz read speed at 85 °C, and optimized command sequences that eliminate opcode overhead. These capabilities reduce instruction fetch latency and enable direct CPU execution from flash without copying to RAM, conserving SRAM resources in memory-constrained MCUs.
How many One-Time Programmable (OTP) security registers does AT25SF128A-SHB-Y have, and what is their size?
AT25SF128A-SHB-Y includes three independent 256-byte One-Time Programmable (OTP) security registers. Once programmed, these registers cannot be erased or rewritten, providing permanent storage for cryptographic keys, device serial numbers, calibration constants, or other immutable identity or security-critical data required in regulated industries.
What package type corresponds to the "-SHB-Y" suffix in AT25SF128A-SHB-Y?
The "-SHB-Y" suffix denotes the 8-pad W-SOIC (208-mil) package - a standard industry footprint measuring 5.3 mm × 5.3 mm × 1.95 mm with gull-wing leads. This package is RoHS-compliant, halide-free, and qualified for industrial temperature range (–40 °C to +85 °C), making it suitable for surface-mount assembly in high-volume manufacturing.
Can AT25SF128A-SHB-Y operate across both industrial and extended temperature ranges?
AT25SF128A-SHB-Y is rated for the industrial temperature range of –40 °C to +85 °C. While the broader AT25SF/QF128A family includes extended-range variants (–40 °C to +105 °C), the "-SHB-Y" ordering code specifically corresponds to the industrial-grade version. For +105 °C operation, Renesas offers alternate part numbers such as AT25SF128A-SHB-T.
AT25SF128A-SHB-Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR (SLC)
- Memory Size:
- 128Mbit
- Memory Organization:
- 16M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 133 MHz
- Write Cycle Time - Word, Page:
- 50µs, 2.4ms
- Access Time:
- 6 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25SF128A-SHB-Y FAQ
1.How can I place an order for AT25SF128A-SHB-Y through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF128A-SHB-Y 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 AT25SF128A-SHB-Y reliable?
The price and inventory of AT25SF128A-SHB-Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF128A-SHB-Y is usually 5 days.
3.What payment methods are accepted for AT25SF128A-SHB-Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF128A-SHB-Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF128A-SHB-Y?
AT25SF128A-SHB-Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF128A-SHB-Y 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 AT25SF128A-SHB-Y?
For technical support, including AT25SF128A-SHB-Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF128A-SHB-Y requirements.
6.How does Aetrix verify that AT25SF128A-SHB-Y is sourced from the original manufacturer or authorized distributors?
All AT25SF128A-SHB-Y 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 AT25SF128A-SHB-Y meets industry standards.
7.What is the process for return or replacement of AT25SF128A-SHB-Y?
All AT25SF128A-SHB-Y units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF128A-SHB-Y, 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 AT25SF128A-SHB-Y part is unused and in its original packaging.
Return procedure for AT25SF128A-SHB-Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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