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Renesas AT25DF321A-SH-B
- Part No.:
- AT25DF321A-SH-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25DF321A-SH-B.pdf
- Description:
- IC FLASH 32MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:24,875
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Product details
Overview
AT25DF321A-SH-B from Adesto Technologies (now part of Dialog Semiconductor) 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 delay, and features uniform 4/32/64-Kbyte erase blocks - enabling efficient firmware updates and secure data logging in resource-constrained devices.
For engineers reviewing the AT25DF321A-SH-B datasheet, AT25DF321A-SH-B pinout, AT25DF321A-SH-B application, or AT25DF321A-SH-B equivalent, key selection criteria include its dual-input/dual-output programming/read capability, sector lockdown for permanent read-only protection, 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-B implements a flexible hierarchical erase architecture with four granularities (4/32/64-Kbyte blocks + full chip), optimized to minimize wasted space in code+data applications. Its memory array is partitioned into 64 uniform 64-Kbyte sectors, each individually protectable via software or hardware (WP pin), and lockable permanently via Sector Lockdown command (0x33).
It supports dual-mode SPI operation: standard single-bit I/O (SI/SO), plus accelerated dual-input program (SOI+SI) and dual-output read (SO+SIO), both clocked at up to 85MHz. Internal status polling, program/erase suspend/resume, and automatic failure reporting (EPE bit) enable robust host-controlled flash management without external timing dependencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MByte) organized as 64 sectors × 64 Kbytes |
| Supply Voltage | 2.7V–3.6V - enables direct integration into 3V microcontroller systems without level-shifting |
| Max Read Frequency | 100 MHz (RapidS mode) - reduces instruction fetch latency in boot-from-flash architectures |
| Clock-to-Output Delay | 5 ns max - ensures tight timing margins for high-speed CPU interfaces |
| Erase Block Sizes | 4 Kbyte / 32 Kbyte / 64 Kbyte / Full Chip - allows precise firmware patching without erasing unrelated code modules |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - suitable for field-upgradable industrial firmware |
| Deep Power-Down Current | 5 µA typical - extends battery life in always-on IoT edge nodes |
Pinout & Package
AT25DF321A-SH-B is housed in an industry-standard 8-lead SOIC (208-mil wide) package, pin-compatible with legacy SPI Flash devices and compatible with automated PCB assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; rising edge ends operations and places SO in high-Z state |
| SCK | Serial Clock | Input clock controlling data latching (rising edge) and output timing (falling edge) |
| SI (SIO) | Serial Input / Dual-Output | Standard input for commands/addresses/data; becomes output during Dual-Output Read (SIO mode) |
| SO (SOI) | Serial Output / Dual-Input | Standard output for read data; becomes input during Dual-Input Program (SOI mode) |
| WP | Write Protect | Hardware-enabled sector locking; low-active; internally pulled high |
| HOLD | Communication Pause | Temporarily suspends SPI transfer without deselecting device; low-active; internally pulled high |
| VCC | Power Supply | 2.7V–3.6V main supply; powers all internal logic and memory array |
| GND | Ground Reference | System ground return path for VCC and all I/O signals |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read Array (0x3B) | Delivers 2 bits per SCK cycle - doubles effective read bandwidth vs. standard SPI at same clock rate |
| Sector Lockdown (0x33) | Makes any combination of 64-Kbyte sectors permanently read-only - prevents tampering with bootloader or crypto keys |
| 128-byte OTP Security Register | Stores immutable device-specific data (e.g., ESN, cryptographic keys) - immune to reprogramming or erase |
| Program/Erase Suspend/Resume | Allows host to pause long erase cycles (e.g., 400ms 64-Kbyte erase) to service time-critical interrupts |
| Individual Sector Protection | Enables selective unprotect of one sector while keeping others locked - supports modular firmware updates |
Applications
| Secure Bootloader Storage | Firmware Over-the-Air (FOTA) Updates |
|---|---|
Use Scenario: Storing immutable bootloader code in a tamper-resistant region of flash memory. IC Role / Device Role / Timing Role: Non-volatile storage for first-stage boot code executed directly by MCU on power-up. Use Value: Sector Lockdown (0x33) ensures bootloader remains permanently read-only, preventing corruption or malicious overwrite during field updates. | Use Scenario: Receiving and validating new firmware images in connected industrial gateways. IC Role / Device Role / Timing Role: High-reliability code storage with atomic update capability using 4-Kbyte block erase granularity. Use Value: Uniform 4-Kbyte erase blocks allow patching individual firmware modules without disturbing adjacent code or configuration data. |
| Data Logging in Harsh Environments | Consumer Electronics Configuration Storage |
Use Scenario: Recording sensor readings and event timestamps in automotive telematics units operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade non-volatile memory supporting frequent small writes with guaranteed 20-year retention. Use Value: 100,000 endurance cycles and deep power-down current (5 µA) enable reliable long-term logging with minimal energy overhead. | Use Scenario: Storing user preferences, calibration data, and regional settings in smart home controllers. IC Role / Device Role / Timing Role: Secure, low-pin-count configuration memory interfaced via existing SPI bus. Use Value: Individual sector protection + Global Protect/Unprotect simplifies factory programming and field customization without risk to firmware integrity. |
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, 1.8V–3.6V supply, Quad SPI support (QPI), no RapidS or dual-I/O modes | Lacks dual-input/dual-output acceleration and sector lockdown; requires QSPI controller | Preferred where quad interface bandwidth is critical and hardware lockdown is not required |
| Macronix MX25L3233FZNI-10G | 32 Mbit, 2.7V–3.6V, supports SPI Modes 0/3, 104MHz max read, no dual-I/O or lockdown | Higher max frequency but lacks OTP register and permanent sector lockdown capability | Selected when maximum read throughput is prioritized over secure write-protection features |
Compared with W25Q32JVSSIQ and MX25L3233FZNI-10G, the AT25DF321A-SH-B uniquely combines RapidS acceleration, dual-input/dual-output operation, and irreversible sector lockdown - making it optimal for safety-critical or security-sensitive embedded firmware storage where code integrity is non-negotiable.
Availability
AT25DF321A-SH-B is available at Aetrix Electronics and suitable for industrial control systems, automotive telematics modules, and secure IoT edge devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT25DF321A-SH-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
Adesto Technologies, acquired by Dialog Semiconductor in 2020, specialized in low-power, high-performance non-volatile memory and analog ICs for IoT and industrial applications.
The AT25DF321A-SH-B belongs to Adesto's DataFlash® family - engineered specifically for embedded systems needing fast, flexible, and secure serial Flash with advanced protection mechanisms beyond basic SPI compatibility.
FAQ
What is the operating voltage range for the AT25DF321A-SH-B?
The AT25DF321A-SH-B operates from a single 2.7V to 3.6V supply. This 3V-compatible range eliminates the need for external voltage translators when interfacing with common 3.3V microcontrollers and SoCs. Operation outside this range may cause unreliable behavior or data corruption, and the device does not support 1.8V or 5V interfaces.
Does the AT25DF321A-SH-B support Quad SPI (QSPI) interface?
No, the AT25DF321A-SH-B does not support Quad SPI. It supports standard SPI with single- and dual-I/O modes only: Dual-Output Read (SO+SIO) and Dual-Input Program (SOI+SI). It lacks quad-capable pins (IO2/IO3) and corresponding opcodes. For QSPI functionality, consider alternatives like Winbond W25Q32JVSSIQ.
How does sector lockdown work on the AT25DF321A-SH-B?
Sector lockdown on the AT25DF321A-SH-B is enabled via the 0x33 command and makes selected 64-Kbyte sectors permanently read-only - irreversible even by power cycling or reset. Once locked, no program or erase commands affect those sectors. The AT25DF321A-SH-B provides dedicated lockdown registers and freeze command (0x34) to prevent further changes to the lockdown state.
What is the purpose of the 128-byte OTP security register in the AT25DF321A-SH-B?
The 128-byte One-Time Programmable (OTP) security register in the AT25DF321A-SH-B stores immutable, factory-programmable data such as electronic serial numbers (ESN), cryptographic keys, or device-specific calibration values. Once written, contents cannot be erased or modified - providing hardware-enforced uniqueness and security for the AT25DF321A-SH-B in authentication and anti-counterfeiting applications.
Can the AT25DF321A-SH-B be used in industrial temperature environments?
Yes, the AT25DF321A-SH-B is fully specified for the industrial temperature range of –40°C to +85°C. All electrical parameters - including 100MHz RapidS read speed, 5ns tV, and 5µA deep power-down current - are guaranteed across this range. Its green (Pb/Halide-free/RoHS-compliant) 8-lead SOIC package meets JEDEC standards for thermal reliability in extended-temperature deployments.
AT25DF321A-SH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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-B FAQ
1.How can I place an order for AT25DF321A-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF321A-SH-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 AT25DF321A-SH-B reliable?
The price and inventory of AT25DF321A-SH-B 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-B is usually 5 days.
3.What payment methods are accepted for AT25DF321A-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF321A-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF321A-SH-B?
AT25DF321A-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF321A-SH-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 AT25DF321A-SH-B?
For technical support, including AT25DF321A-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF321A-SH-B requirements.
6.How does Aetrix verify that AT25DF321A-SH-B is sourced from the original manufacturer or authorized distributors?
All AT25DF321A-SH-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 AT25DF321A-SH-B meets industry standards.
7.What is the process for return or replacement of AT25DF321A-SH-B?
All AT25DF321A-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF321A-SH-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 AT25DF321A-SH-B part is unused and in its original packaging.
Return procedure for AT25DF321A-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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