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Renesas AT25DF321A-SH-T
- Part No.:
- AT25DF321A-SH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25DF321A-SH-T.pdf
- Description:
- IC FLASH 32MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,978
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Product details
Overview
AT25DF321A-SH-T from Adesto Technologies (acquired by Dialog Semiconductor, now part of Renesas) is a 32-Mbit serial Flash memory IC designed for code shadowing and mixed code/data storage in embedded systems. It operates from a single 2.7V–3.6V supply, supports SPI Modes 0/3 and RapidS protocol, delivers up to 100MHz read speed with 5ns clock-to-output, and features uniform 4/32/64-Kbyte erase blocks.
For engineers reviewing the AT25DF321A-SH-T datasheet, AT25DF321A-SH-T pinout, AT25DF321A-SH-T application, or AT25DF321A-SH-T equivalent, key selection criteria include sector lockdown capability, dual-input/dual-output programming/read modes, 128-byte OTP security register, industrial temperature range (–40°C to +85°C), and RoHS-compliant 8-lead SOIC package.
Technical Context
The AT25DF321A-SH-T implements a flexible erase architecture with four granularities (4/32/64-Kbyte blocks + full chip), enabling efficient co-location of firmware code and runtime data without wasted space. Its memory array comprises 64 uniform 64-Kbyte sectors, each individually protectable via software or hardware (WP pin).
It integrates dual-mode SPI operation: standard single-bit I/O plus accelerated dual-input program (SOI+SI) and dual-output read (SO+SIO), both supporting up to 85MHz. The device includes programmable OTP security register, sector lockdown (permanent read-only), and deep power-down mode drawing only 5µA typical current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MByte) - sufficient for boot code, firmware images, and configuration data in resource-constrained microcontrollers. |
| Supply Voltage | 2.7V–3.6V - compatible with standard 3V logic systems; no auxiliary voltage required for programming/erase. |
| Max Read Frequency | 100 MHz (RapidS) - enables high-throughput code execution via XIP or fast shadowing into RAM. |
| Read Latency | 5 ns max tV (clock-to-output) - minimizes wait states during high-speed sequential reads. |
| Erase Granularity | 4-Kbyte / 32-Kbyte / 64-Kbyte blocks + full chip - allows precise firmware patching and data logging without erasing unrelated sectors. |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - suitable for field-upgradable devices with long service life. |
| Power Consumption | 12 mA active read (20 MHz); 5 µA deep power-down - extends battery life in always-on or low-duty-cycle IoT nodes. |
Pinout & Package
AT25DF321A-SH-T is housed in an industry-standard 8-lead SOIC (208-mil wide) package, pin-compatible with common serial Flash footprints and optimized for reflow assembly in industrial and consumer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high→low to initiate commands and low→high to terminate operations. |
| SCK | Serial Clock | Master-generated clock; data latched on rising edge (SI/SIO), output on falling edge (SO/SOI). |
| SI (SIO) | Serial Input / Dual-Output | Standard command/address/data input; becomes SIO output during Dual-Output Read for 2-bit-per-cycle throughput. |
| SO (SOI) | Serial Output / Dual-Input | Standard data output; becomes SOI input during Dual-Input Program to double write bandwidth. |
| WP | Write Protect | Hardware lock control: low = enables sector protection; internally pulled high; optional external VCC tie. |
| HOLD | Communication Pause | Active-low suspend of SPI transfers without deselecting device; requires CS asserted and SCK low to activate. |
| VCC | Power Supply | Primary 2.7–3.6V supply; powers all internal logic, memory array, and I/O buffers. |
| GND | Ground Reference | System ground return path; critical for noise immunity and stable read/write margins. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read Array | Delivers 2 bits per SCK cycle (SO+SIO) at up to 85MHz - doubles effective read bandwidth vs. standard SPI. |
| Dual-Input Byte/Page Program | Accepts 2 bits per SCK cycle (SOI+SI) - accelerates firmware updates and data logging in bandwidth-limited hosts. |
| Sector Lockdown | Permanently disables program/erase on any combination of 64-Kbyte sectors - enforces immutable secure boot or cryptographic key storage. |
| 128-Byte OTP Security Register | One-time programmable space for ESN, device serialization, or locked encryption keys - immune to field reprogramming. |
| Flexible Erase Architecture | Four erase granularities (4/32/64-Kbyte + chip) - eliminates need for separate EEPROM in mixed code/data applications. |
Applications
| Secure Boot Firmware Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing immutable bootloader and root-of-trust code in factory-programmed devices requiring tamper resistance. IC Role / Device Role / Timing Role: Nonvolatile code storage with permanent sector lockdown and OTP key storage for cryptographic verification. Use Value: Prevents unauthorized firmware modification; ensures boot integrity across 20-year product lifecycle with 100K endurance. | Use Scenario: Retaining calibrated sensor parameters, motion profiles, and safety-critical logic configurations in programmable logic controllers. IC Role / Device Role / Timing Role: Field-updatable data storage with individual sector protection to isolate runtime variables from firmware updates. Use Value: Enables safe in-field parameter tuning without risking corruption of operational firmware or safety routines. |
| Consumer IoT Device OTA Storage | Automotive Infotainment System Code Cache |
Use Scenario: Holding compressed firmware images and delta patches for over-the-air updates in battery-powered smart home sensors. IC Role / Device Role / Timing Role: High-speed read (100MHz RapidS) and fast 4-Kbyte block erase for rapid patch application. Use Value: Reduces update time and power consumption: 50ms typical 4-Kbyte erase + 1.0ms page program enables sub-second OTA commits. | Use Scenario: Caching frequently accessed UI assets and navigation map tiles in automotive head units to reduce SoC memory bandwidth pressure. IC Role / Device Role / Timing Role: Low-latency serial Flash acting as extended instruction/data cache with 5ns tV timing. Use Value: Supports real-time rendering and voice response by delivering assets at >80 MB/s effective bandwidth via Dual-Output Read. |
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 W25Q32JVSSIQ | 32-Mbit, 1.65–3.6V supply, Quad SPI support (QPI), no RapidS or dual-I/O modes; 133MHz max clock. | Lacks sector lockdown and OTP register; uses different protection model (status register-based). | Choose when Quad SPI interface and broader voltage range are prioritized over hardware security features. |
| Micron MT25QL32ABA8ESF-0SIT | 32-Mbit, 2.7–3.6V, supports x1/x2/x4 SPI, 133MHz max, built-in ECC, no dual-input program mode. | Includes on-die ECC for enhanced reliability but omits sector lockdown and 128-byte OTP register. | Select for mission-critical industrial applications where bit-error correction outweighs permanent lockdown requirements. |
Compared with W25Q32JVSSIQ and MT25QL32ABA8ESF-0SIT, the AT25DF321A-SH-T uniquely combines RapidS acceleration, dual-input programming, hardware-sector lockdown, and OTP security-making it optimal for secure, high-throughput embedded code+data storage where tamper resistance and field update efficiency are mandatory.
Availability
AT25DF321A-SH-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, secure IoT gateways, and medical diagnostic equipment requiring stable component supply and long-term manufacturability.
Supply support for AT25DF321A-SH-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
Adesto Technologies, acquired by Dialog Semiconductor in 2020 and integrated into Renesas Electronics, specialized in low-power, high-performance nonvolatile memory and analog ICs for IoT and industrial edge devices.
The AT25DF321A-SH-T belongs to Adesto's DataFlash® family, engineered specifically for applications demanding simultaneous code execution and reliable data logging in constrained 3V environments with stringent security and timing requirements.
FAQ
What is the operating temperature range for the AT25DF321A-SH-T?
The AT25DF321A-SH-T is rated for the full industrial temperature range of –40°C to +85°C. This specification is validated across all electrical parameters including read latency, program/erase timing, and protection functionality, ensuring reliable operation in harsh environments such as factory automation controllers and outdoor IoT gateways. The AT25DF321A-SH-T maintains its 5ns tV and 100,000-cycle endurance rating across this entire range.
Does the AT25DF321A-SH-T support Quad SPI (QSPI) interface?
No, the AT25DF321A-SH-T does not support Quad SPI. It implements standard SPI with optional dual-input (SOI+SI) and dual-output (SO+SIO) modes for accelerated transfers, but lacks dedicated QSPI pins or command set. Its interface remains strictly 4-wire SPI (CS, SCK, SI, SO) with WP and HOLD control lines. For QSPI compatibility, consider alternatives like the Winbond W25Q32JVSSIQ, but note that the AT25DF321A-SH-T offers unique RapidS timing and hardware lockdown not found in most QSPI parts.
How does sector lockdown differ from standard sector protection on the AT25DF321A-SH-T?
Sector lockdown on the AT25DF321A-SH-T is a one-time, irreversible hardware feature that permanently disables program and erase operations on selected 64-Kbyte sectors, even after power cycles or reset. Standard sector protection is software-controlled and can be reversed using Unprotect Sector or Global Unprotect commands. The AT25DF321A-SH-T implements both: standard protection for field-updatable code regions and lockdown for immutable bootloaders or cryptographic keys stored in the OTP register.
What is the purpose of the 128-byte OTP security register in the AT25DF321A-SH-T?
The 128-byte OTP (One-Time Programmable) security register in the AT25DF321A-SH-T provides tamper-resistant storage for device-unique identifiers, electronic serial numbers (ESN), cryptographic keys, or locked configuration parameters. Once programmed, contents cannot be altered or erased - making it ideal for secure boot validation, license enforcement, or anti-counterfeiting. This register operates independently of the main Flash array and is accessible via dedicated Program/Read OTP commands (9Bh/77h), ensuring separation from firmware updates.
Can the AT25DF321A-SH-T be used in 1.8V systems?
No, the AT25DF321A-SH-T requires a minimum supply voltage of 2.7V and is not rated for 1.8V operation. Its internal charge pump, memory cell threshold design, and I/O buffer thresholds are optimized for 2.7–3.6V. Attempting to operate below 2.7V may result in unreliable reads, failed program/erase cycles, or undefined protection behavior. For 1.8V serial Flash, consider alternatives such as the Macronix MX25L3233F or Cypress S25FL132K, but note that these do not replicate the AT25DF321A-SH-T's RapidS timing or sector lockdown capability.
AT25DF321A-SH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 256 Bytes x 16384 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 100 MHz
- Write Cycle Time - Word, Page:
- 7µs, 3ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25DF321A-SH-T FAQ
1.How can I place an order for AT25DF321A-SH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF321A-SH-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 AT25DF321A-SH-T reliable?
The price and inventory of AT25DF321A-SH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF321A-SH-T is usually 5 days.
3.What payment methods are accepted for AT25DF321A-SH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF321A-SH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF321A-SH-T?
AT25DF321A-SH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF321A-SH-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 AT25DF321A-SH-T?
For technical support, including AT25DF321A-SH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF321A-SH-T requirements.
6.How does Aetrix verify that AT25DF321A-SH-T is sourced from the original manufacturer or authorized distributors?
All AT25DF321A-SH-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 AT25DF321A-SH-T meets industry standards.
7.What is the process for return or replacement of AT25DF321A-SH-T?
All AT25DF321A-SH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF321A-SH-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 AT25DF321A-SH-T part is unused and in its original packaging.
Return procedure for AT25DF321A-SH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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