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Renesas AT25SL321-SHE-T
- Part No.:
- AT25SL321-SHE-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SL321-SHE-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,928
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Product details
Overview
AT25SL321-SHE-T from Renesas Electronics is a 32-Mbit serial flash memory IC designed for code shadowing and data storage in embedded systems. It operates from a single 1.7–2.0 V supply, supports SPI/QPI interfaces up to 104 MHz, delivers 6 ns clock-to-output timing, and achieves up to 65 MB/s continuous read throughput via Quad I/O mode. It is used in industrial controllers requiring reliable nonvolatile storage with fast boot and firmware update capability.
For engineers reviewing the AT25SL321-SHE-T datasheet, AT25SL321-SHE-T pinout, AT25SL321-SHE-T application, or AT25SL321-SHE-T equivalent, key selection criteria include its 1.7 V minimum operating voltage, 4-kbyte/32-kbyte/64-kbyte flexible erase blocks, 2 µA deep power-down current, hardware write protection via WP pin, and JEDEC SFDP register compliance for automated configuration.
Technical Context
The AT25SL321-SHE-T implements a dual-mode serial interface supporting standard SPI (Modes 0/3), Dual I/O, Quad I/O, and QPI protocols - enabling configurable bandwidth scaling from 104 MHz single-line to 532 MHz effective quad-data-rate operation. Its memory array comprises 16,384 × 256-byte pages organized into physical 8-Mbit blocks.
It integrates dedicated hardware features including a 4-kbit secured OTP register, erase/program suspend-resume capability, accelerated programming via 9 V ACC pin, and status register-based quad enable (QE) and block protection (SRP0/SRP1) - all managed through standardized command sets compliant with JEDEC JESD216 for SFDP discovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB), organized as 16,384 pages × 256 bytes - enables full firmware image storage for mid-tier microcontrollers. |
| Supply Voltage | 1.7 V to 2.0 V - compatible with low-voltage SoC I/O domains and eliminates level-shifting in modern 1.8 V systems. |
| Max Clock Frequency | 104 MHz (SPI/QPI) - supports 6 ns tV1 output delay and 65 MB/s sustained read rate in Quad I/O mode. |
| Erase Granularity | 4-kbyte, 32-kbyte, 64-kbyte blocks, and full chip - minimizes wasted space during partial firmware updates. |
| Endurance & Retention | 100,000 program/erase cycles per block; 20-year data retention - validated for industrial lifecycle requirements. |
| Power Consumption | 2 µA deep power-down current; 7 mA active read current - extends battery life in always-on edge nodes. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial-grade deployment without derating. |
Pinout & Package
AT25SL321-SHE-T is packaged in an 8-lead SOIC (208 mil) body measuring 8.9 mm × 4.0 mm × 1.5 mm, with gull-wing leads and RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must fall before any command; requires external 10 kΩ pull-up to VCC for robust power-up sequencing. |
| SCK | Serial Clock | Input timing reference; data latched on rising edge, output shifted on falling edge - defines maximum interface speed. |
| SI (IO0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input path in SPI mode; functions as bidirectional I/O0 in Dual/Quad modes. |
| SO (IO1) | Serial Output / Quad I/O Lane 1 | Default output in SPI; becomes bidirectional I/O1 in Dual/Quad modes - enables simultaneous multi-bit transfers. |
| WP (IO2, ACC) | Write Protect / Acceleration Control | Hardware lock for protected sectors when low; accepts 9 V for accelerated programming - dual-function pin reduces BOM count. |
| HOLD (IO3) | Operation Suspend | Pauses ongoing read/write without deselecting device - preserves bus arbitration in multi-master systems. |
| VCC | Power Supply | 1.7–2.0 V core supply; internal regulation ensures stable operation across voltage tolerance band. |
| GND | Ground Reference | Common return path for all I/O and core logic; must be low-impedance to maintain signal integrity at 104 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Quad Peripheral Interface (QPI) | Enables single-cycle command+address+data transfer at 104 MHz, reducing instruction overhead vs. standard SPI. |
| Flexible Erase Architecture | Supports 4-kB, 32-kB, 64-kB, and full-chip erase - optimizes memory utilization for mixed code/data partitions. |
| Secured One-Time Programmable Register | 4-kbit OTP area with hardware locking - stores immutable keys, calibration data, or device-unique identifiers. |
| Serial Flash Discoverable Parameters (SFDP) | JESD216-compliant register allows host bootloader to auto-detect density, timing, and command set - eliminates hard-coded flash drivers. |
| Erase/Program Suspend & Resume | Permits high-priority reads to interrupt background erase/program operations - improves real-time system responsiveness. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code Storage |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random-access read for boot-time shadowing into RAM and deterministic page-program for field updates. Use Value: 6 ns tV1 and 104 MHz QPI support reduce boot time by >35% vs. legacy 50 MHz SPI flash; 4-kB erase blocks minimize update latency. | Use Scenario: Holding certified boot loader, secure boot keys, and regulatory-mandated diagnostic logs in portable ultrasound and infusion pump systems. IC Role / Device Role / Timing Role: Trusted execution root-of-trust anchor with secured OTP for cryptographic key storage and tamper-resistant parameter retention. Use Value: 4-kbit secured OTP prevents unauthorized key extraction; 20-year data retention meets FDA Class II device archival requirements. |
| Automotive ADAS Camera Module | Smart Energy Meter Firmware |
Use Scenario: Storing image processing firmware and calibration tables in surround-view camera ECUs operating in extended temperature ranges. IC Role / Device Role / Timing Role: High-reliability code storage with −40 °C to +85 °C qualification and 100K-cycle endurance for over-the-air update cycles. Use Value: 1.7 V min supply enables direct connection to 1.8 V domain of image signal processors; 65 MB/s Quad I/O sustains real-time firmware patching. | Use Scenario: Hosting metrology firmware, tariff tables, and encrypted usage history in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: Secure, long-life nonvolatile storage with hardware write protection (WP pin) and SFDP-driven configuration for interoperable firmware upgrades. Use Value: Hardware WP pin prevents accidental overwrite during meter commissioning; SFDP simplifies driver porting across meter generations. |
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 W25Q32JW | 32 Mbit, 1.7–1.95 V, supports octal DTR mode up to 200 MHz; lacks ACC pin and secured OTP register. | Better peak bandwidth for high-throughput streaming; no hardware-accelerated programming or secure key storage. | Select W25Q32JW when raw speed > security or acceleration; choose AT25SL321-SHE-T for trusted firmware updates and low-voltage robustness. |
| Micron MT25QL32ABB | 32 Mbit, 2.7–3.6 V only; supports Xccela interface and 133 MHz DDR; incompatible supply voltage range. | Requires level-shifting in 1.8 V systems; offers higher-speed DDR mode but no deep power-down optimization. | MT25QL32ABB is unsuitable for 1.8 V native designs; AT25SL321-SHE-T provides direct compatibility and 2 µA deep power-down for battery-backed meters. |
Compared with W25Q32JW and MT25QL32ABB, the AT25SL321-SHE-T uniquely combines 1.7 V operation, hardware-accelerated programming, secured OTP, and sub-µA deep power-down - making it optimal for energy-constrained, security-aware industrial firmware storage where voltage headroom and trust anchors are critical.
Availability
AT25SL321-SHE-T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic devices, automotive ADAS modules, and smart utility meters requiring stable component supply across multi-year production cycles.
Supply support for AT25SL321-SHE-T 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 infrastructure markets.
The AT25SL321 belongs to Renesas' serial NOR flash product line, engineered specifically for low-voltage, high-reliability embedded code and data storage - emphasizing power efficiency, security primitives, and seamless integration with ARM Cortex-M and RISC-V host processors.
FAQ
What is the minimum supply voltage required for reliable operation of the AT25SL321-SHE-T?
The AT25SL321-SHE-T operates reliably from a minimum supply voltage of 1.7 V up to 2.0 V. This 1.7 V threshold enables direct interfacing with 1.8 V I/O domains without level shifters, reducing bill-of-materials cost and PCB complexity in modern low-power embedded systems. Operation below 1.7 V is not guaranteed and may result in command failure or data corruption.
Does the AT25SL321-SHE-T support Quad SPI (QPI) mode, and how is it enabled?
Yes, the AT25SL321-SHE-T supports Quad Peripheral Interface (QPI) mode. QPI is enabled by issuing the Enable QPI (38h) command after setting the Quad Enable (QE) bit in Status Register-2. Once enabled, all subsequent commands use four I/O lines simultaneously, allowing 104 MHz clock rates to achieve up to 532 MHz effective throughput. The AT25SL321-SHE-T remains backward-compatible with standard SPI commands in QPI mode.
How does the hardware write protection work on the AT25SL321-SHE-T?
The AT25SL321-SHE-T implements hardware write protection using the WP (Write Protect) pin, which - when driven low - locks protected memory blocks defined by the Status Register Protect (SRP1/SRP0) bits. Protection is nonvolatile and persists across power cycles. The WP pin also serves as the ACC (Acceleration) input, accepting 9 V for faster programming, but write protection is active only when WP is asserted low during normal 1.7–2.0 V operation.
What is the purpose and capacity of the secured OTP register in the AT25SL321-SHE-T?
The AT25SL321-SHE-T includes a 4-kbit secured One-Time Programmable (OTP) register used to store immutable data such as cryptographic keys, device-specific calibration values, or secure boot manifests. Once programmed, the OTP area cannot be erased or rewritten. Access is controlled via dedicated Enter Secured OTP (B1h) and Exit Secured OTP (C1h) commands, ensuring isolation from main array operations and preventing accidental overwrite.
Can the AT25SL321-SHE-T suspend an ongoing erase or program operation?
Yes, the AT25SL321-SHE-T supports erase/program suspend and resume functionality. By issuing the Erase/Program Suspend (75h) command, the device pauses the current operation and enters standby mode, allowing high-priority read commands to execute immediately. A subsequent Erase/Program Resume (7Ah) command restores the suspended operation. This feature is essential for real-time systems requiring deterministic response times during firmware updates.
AT25SL321-SHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR (SLC)
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI - Quad I/O, QPI
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 150µs, 5ms
- Access Time:
- 7 ns
- Voltage - Supply:
- 1.7V ~ 2V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25SL321-SHE-T FAQ
1.How can I place an order for AT25SL321-SHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SL321-SHE-T 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 AT25SL321-SHE-T reliable?
The price and inventory of AT25SL321-SHE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SL321-SHE-T is usually 5 days.
3.What payment methods are accepted for AT25SL321-SHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SL321-SHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SL321-SHE-T?
AT25SL321-SHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SL321-SHE-T 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 AT25SL321-SHE-T?
For technical support, including AT25SL321-SHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SL321-SHE-T requirements.
6.How does Aetrix verify that AT25SL321-SHE-T is sourced from the original manufacturer or authorized distributors?
All AT25SL321-SHE-T 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 AT25SL321-SHE-T meets industry standards.
7.What is the process for return or replacement of AT25SL321-SHE-T?
All AT25SL321-SHE-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SL321-SHE-T, 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 AT25SL321-SHE-T part is unused and in its original packaging.
Return procedure for AT25SL321-SHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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