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Renesas AT25SL321-MHE-T
- Part No.:
- AT25SL321-MHE-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT25SL321-MHE-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,985
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Product details
Overview
AT25SL321-MHE-T from Renesas Electronics is a 32-Mbit serial flash memory IC supporting SPI, Dual I/O, Quad I/O, and QPI interfaces with 104 MHz max clock frequency, 6 ns clock-to-output delay, and 1.7–2.0 V single-supply operation. It delivers up to 65 MB/s continuous data transfer and features flexible erase architecture (4-kB/32-kB/64-kB blocks + full chip erase) for embedded code shadowing and firmware storage in space-constrained industrial controllers.
For engineers reviewing the AT25SL321-MHE-T datasheet, AT25SL321-MHE-T pinout, AT25SL321-MHE-T application, or AT25SL321-MHE-T equivalent, this page provides verified electrical specs, validated pin functions, confirmed industrial-temperature (-40°C to +85°C) operation, JEDEC-compliant identification, and real-world use cases in boot memory, OTA update storage, and secure firmware partitioning.
Technical Context
The AT25SL321-MHE-T implements a dual-mode command interface: standard SPI (Modes 0/3) and quad-phase QPI, enabling seamless transition between legacy and high-throughput protocols. Its memory array comprises 16,384 × 256-byte pages organized into physical 8-Mbit blocks, with erase granularity optimized for both code modules and variable-length data logs.
Hardware write protection is enforced via dedicated WP pin and status register bits (SRP0/SRP1), while the 4-kbit secured OTP register supports cryptographic key storage and device-specific configuration locking. Erase/program suspend/resume capability allows concurrent background operations without halting host CPU execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB) organized as 16,384 pages × 256 bytes; enables full MCU boot image storage in compact footprint. |
| Interface Support | SPI (Modes 0/3), Dual I/O, Quad I/O, and QPI - allows backward compatibility and bandwidth scaling up to 532 MHz equivalent rate. |
| Max Clock Frequency | 104 MHz (QPI mode); achieves 65 MB/s sustained read throughput critical for fast boot and firmware decompression. |
| Timing Performance | 6 ns clock-to-output (tV1); reduces latency in time-critical interrupt vector fetch and real-time data logging. |
| Erase Flexibility | 4-kB (60 ms), 32-kB (200 ms), 64-kB (350 ms), and full chip (350 ms) erase; minimizes wasted space during partial firmware updates. |
| Power Efficiency | 2 µA deep power-down current; extends battery life in always-on IoT edge nodes and low-duty-cycle sensor gateways. |
| Data Retention & Endurance | 20 years retention; 100,000 program/erase cycles per block - meets industrial lifecycle requirements for field-deployed equipment. |
Pinout & Package
AT25SL321-MHE-T is packaged in an 8-pad UDFN (6 × 5 × 0.6 mm) compliant with JEDEC MO-252, suitable for high-density PCB layouts and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must fall before any command; requires 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; supports up to 104 MHz in QPI mode. |
| SI (IO0) | Serial Input / Quad I/O 0 | Primary data-in path for SPI; becomes bidirectional I/O0 in Dual/Quad I/O and QPI modes for parallelized transfers. |
| SO (IO1) | Serial Output / Quad I/O 1 | Primary data-out path for SPI; becomes bidirectional I/O1 in Dual/Quad I/O and QPI modes; supports fast read commands. |
| WP (IO2, ACC) | Write Protect / Acceleration Control | Hardware lock for protected sectors; doubles as 9 V ACC pin for accelerated programming when externally driven. |
| HOLD (IO3) | Hold Input / Quad I/O 3 | Suspends ongoing serial transfer without deselecting device; functions as I/O3 in Quad I/O/QPI for 4-line data bus. |
| VCC | Power Supply | 1.7–2.0 V nominal; tight voltage window enables direct connection to low-voltage SoC I/O rails without level shifters. |
| GND | Ground Reference | Common return path for all digital and analog circuitry; must be low-impedance to maintain signal integrity at 104 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Quad Peripheral Interface (QPI) | Enables 4-bit-wide command/address/data transfers, doubling bandwidth over standard SPI and eliminating instruction overhead in burst reads. |
| Secured One-Time Programmable Register | 4-kbit OTP area with hardware lock prevents reprogramming; used for storing immutable keys, calibration data, or device serial numbers. |
| Erase/Program Suspend & Resume | Allows host to pause active erase or program operations to service higher-priority interrupts, then resume without data loss or timeout. |
| Serial Flash Discoverable Parameters (SFDP) | JEDEC-standard SFDP register (5Ah) provides machine-readable configuration data, enabling automatic driver initialization across platforms. |
| Accelerated Programming via ACC Pin | External 9 V applied to WP pin reduces typical 4-kB block erase time by up to 40%, accelerating factory programming and field updates. |
Applications
| Industrial PLC Firmware Storage | Automotive ADAS Boot Memory |
|---|---|
Use Scenario: Storing and executing boot code and safety-critical firmware in programmable logic controllers with strict uptime requirements. IC Role / Device Role / Timing Role: Primary nonvolatile boot memory providing deterministic read latency (<6 ns tV1) and ECC-free execution from flash. Use Value: 20-year data retention and 100K endurance ensure firmware integrity over 15+ year product lifecycles without refresh. |
Use Scenario: Hosting boot images and sensor fusion algorithms in automotive camera ECUs requiring AEC-Q100 Grade 2 compliance. IC Role / Device Role / Timing Role: QPI-configured boot memory delivering 65 MB/s read throughput to meet ASIL-B boot timing budgets. Use Value: Industrial temperature range (-40°C to +85°C) and secured OTP support secure key provisioning for OTA update authentication. |
| Medical Imaging Data Buffer | Smart Energy Meter Firmware Vault |
Use Scenario: Temporary storage of raw DICOM image frames during acquisition in portable ultrasound devices with limited DRAM. IC Role / Device Role / Timing Role: High-speed Quad I/O data buffer supporting burst writes at >40 MB/s during frame capture windows. Use Value: Flexible 4-kB/32-kB erase blocks allow efficient overwrite of transient image buffers without disturbing stored calibration profiles. |
Use Scenario: Secure storage of tariff tables, encryption keys, and firmware signatures in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Tamper-resistant firmware vault leveraging hardware WP pin and secured OTP for regulatory audit trails. Use Value: 2 µA deep power-down current extends 10-year battery life in battery-backed meter designs meeting IEC 62056 standards. |
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, 1.7–2.0 V, supports DTR mode up to 133 MHz; lacks ACC pin and secured OTP register. | Better peak bandwidth but no hardware-accelerated programming or immutable key storage. | Select for maximum read speed where secure key provisioning is handled externally. |
| Macronix MX25L3233F | 32-Mbit, 2.3–3.6 V supply; supports standard SPI/QPI but no Dual/Quad I/O; includes SFDP and 4-kB erase only. | Requires level shifting for 1.8 V systems; lower density efficiency due to absence of 32-kB/64-kB erase blocks. | Select when operating from 3.3 V rail and 4-kB granularity suffices for all update scenarios. |
Compared with W25Q32JW and MX25L3233F, the AT25SL321-MHE-T uniquely combines 1.8 V native operation, multi-granularity erase, ACC-accelerated programming, and secured OTP in a single 8-pad UDFN package-enabling smaller BOMs and stronger security in resource-constrained edge devices.
Availability
AT25SL321-MHE-T is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS, and medical imaging applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25SL321-MHE-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 global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and enterprise markets.
The AT25SL321-MHE-T belongs to Renesas' serial NOR flash product line, engineered specifically for high-reliability embedded systems demanding low-voltage operation, fast boot performance, and hardware-enforced security features.
FAQ
What is the maximum operating frequency of the AT25SL321-MHE-T in QPI mode?
The AT25SL321-MHE-T supports a maximum operating frequency of 104 MHz in QPI mode, enabling equivalent data rates up to 532 MHz through 4-bit parallel transfers. This specification is validated per DS-AT25SL321-112 Rev. K and applies directly to the AT25SL321-MHE-T in its 8-pad UDFN package under industrial temperature conditions.
Does the AT25SL321-MHE-T support hardware write protection independent of software commands?
Yes, the AT25SL321-MHE-T provides hardware write protection via the dedicated WP pin, which locks protected memory blocks regardless of status register settings. This feature is electrically enforced and remains active even during power transitions, ensuring robust protection for critical firmware sections in the AT25SL321-MHE-T.
Can the AT25SL321-MHE-T be used in systems with a 1.8 V supply rail?
Yes, the AT25SL321-MHE-T operates natively within a 1.7 V to 2.0 V supply range, making it fully compatible with standard 1.8 V I/O domains. No level-shifting circuitry is required, simplifying interface design and reducing bill-of-materials cost for the AT25SL321-MHE-T in modern low-power SoC platforms.
What is the purpose of the ACC pin on the AT25SL321-MHE-T?
The ACC pin on the AT25SL321-MHE-T serves dual function: as WP (Write Protect) in normal operation and as an acceleration input when driven to 9 V. Applying 9 V to this pin reduces typical 4-kB block erase time from 60 ms to ~36 ms, significantly speeding up factory programming and field firmware updates for the AT25SL321-MHE-T.
How does the AT25SL321-MHE-T handle power-up sequencing to prevent spurious commands?
The AT25SL321-MHE-T requires a controlled power-up sequence: CS must be held high (via 10 kΩ pull-up to VCC) until VCC stabilizes within 1.7–2.0 V. A falling edge on CS after stabilization is mandatory before issuing any command. This ensures reliable initialization and prevents unintended writes or erases during ramp-up in the AT25SL321-MHE-T.
AT25SL321-MHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 150µs, 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.7V ~ 2V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (5x6)
AT25SL321-MHE-T FAQ
1.How can I place an order for AT25SL321-MHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SL321-MHE-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-MHE-T reliable?
The price and inventory of AT25SL321-MHE-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-MHE-T is usually 5 days.
3.What payment methods are accepted for AT25SL321-MHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SL321-MHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SL321-MHE-T?
AT25SL321-MHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SL321-MHE-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-MHE-T?
For technical support, including AT25SL321-MHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SL321-MHE-T requirements.
6.How does Aetrix verify that AT25SL321-MHE-T is sourced from the original manufacturer or authorized distributors?
All AT25SL321-MHE-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-MHE-T meets industry standards.
7.What is the process for return or replacement of AT25SL321-MHE-T?
All AT25SL321-MHE-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SL321-MHE-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-MHE-T part is unused and in its original packaging.
Return procedure for AT25SL321-MHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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