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Renesas AT25DF021-SSHF-T
- Part No.:
- AT25DF021-SSHF-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DF021-SSHF-T.pdf
- Description:
- IC FLASH 2MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,985
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Product details
Overview
AT25DF021-SSHF-T from Adesto Technologies (now part of Dialog Semiconductor) is a 2-Mbit serial SPI Flash memory IC designed for code shadowing and embedded data storage in resource-constrained systems. It operates from a single 2.3–3.6 V or 2.7–3.6 V supply, supports SPI Modes 0/3 up to 66 MHz, and delivers 6 ns clock-to-output timing. Its flexible erase architecture-supporting 4 KB, 32 KB, 64 KB, and full-chip erase-enables efficient co-location of firmware and runtime data in industrial and consumer control units.
For engineers reviewing the AT25DF021-SSHF-T datasheet, AT25DF021-SSHF-T pinout, AT25DF021-SSHF-T application, or AT25DF021-SSHF-T equivalent, key selection considerations include its dual-voltage operation, hardware write protection via WP pin, 128-byte OTP security register, sector-level protection granularity, and industrial temperature range (–40°C to +85°C).
Technical Context
The AT25DF021-SSHF-T implements a standard SPI interface with dedicated CS, SCK, SI, SO, WP, and HOLD pins, enabling seamless integration with microcontrollers lacking parallel bus interfaces. Its internal address counter supports continuous read wraparound, and command decoding includes opcode validation (e.g., 0Bh/03h for read, 02h for page program, 20h/52h/D8h for block erase).
Memory organization comprises thirty-two 64-KB sectors, each individually protectable via software commands or hardware lock via the WP pin. The device uses an internal SRAM data buffer for page programming (1–256 bytes), and integrates automatic erase/program failure detection via the EPE bit in the status register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes), mapped linearly from 000000h to 03FFFFh |
| Supply Voltage | 2.3–3.6 V or 2.7–3.6 V - single-rail operation eliminates need for charge pumps or auxiliary supplies |
| Max Clock Frequency | 66 MHz - enables high-throughput firmware reads and fast field updates |
| Read Access Time | 6 ns (tV) - supports real-time code execution with minimal wait states |
| Erase Granularity | 4 KB / 32 KB / 64 KB blocks + full chip - minimizes wasted space during partial firmware updates |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - suitable for long-life industrial deployments |
| Power Consumption | 7 mA active read current (20 MHz); 15 µA deep power-down - extends battery life in portable devices |
Pinout & Package
AT25DF021-SSHF-T is housed in an 8-lead SOIC package (150-mil wide), RoHS-compliant and halogen-free. Pin functions are electrically defined and validated per datasheet revision 3677F–DFLASH–5/2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; rising edge terminates all operations and places SO in high-Z state |
| SCK | Serial Clock | Input clock controlling data latching (rising edge) and output timing (falling edge); supports modes 0 and 3 |
| SI | Serial Input | Command, address, and data input path; ignored when CS is deasserted |
| SO | Serial Output | Data output path; tri-stated when CS is high; outputs MSB-first on falling SCK edge |
| WP | Write Protect | Hardware lock for protected sectors; low-active; internally pulled high; optional external tie-to-VCC |
| HOLD | Communication Pause | Halts ongoing SPI transfer without deselecting device; requires CS asserted and SCK low to activate |
| VCC | Power Supply | Primary supply rail; must remain within 2.3–3.6 V or 2.7–3.6 V during all operations |
| GND | Ground Reference | System ground return; required for stable logic levels and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Erase Architecture | Four granular erase options (4/32/64 KB + full chip) reduce memory fragmentation in mixed code/data applications |
| Individual Sector Protection | Four 64-KB sectors independently lockable via software or hardware (WP pin), enabling secure firmware patching |
| 128-Byte OTP Security Register | One-time programmable space for device serialization, ESN storage, or cryptographic key binding |
| Fast Page Programming | 256-byte page writes complete in 1.0 ms typical - accelerates field firmware updates and logging |
| Deep Power-Down Mode | 15 µA typical quiescent current - ideal for battery-backed systems requiring ultra-low standby power |
Applications
| Industrial PLC Firmware Storage | Consumer IoT Sensor Node Data Logging |
|---|---|
Use Scenario: Storing boot firmware and configuration parameters in a DIN-rail mounted programmable logic controller with no external RAM. IC Role / Device Role / Timing Role: Nonvolatile code storage and runtime parameter retention; accessed via SPI at ≤33 MHz for deterministic startup timing. Use Value: Uniform 4-KB erase enables incremental firmware patches without erasing entire application image, preserving calibration data across updates. |
Use Scenario: Capturing temperature/humidity readings every 5 minutes in a battery-powered smart thermostat. IC Role / Device Role / Timing Role: Low-power data buffer with wear leveling; programmed in 256-byte pages during wake-up bursts. Use Value: 15 µA deep power-down current extends 2-AA battery life beyond 2 years while retaining logged history. |
| Medical Diagnostic Handheld Boot Memory | Automotive Body Control Module Code Shadowing |
Use Scenario: Secure boot loader storage in a Class II medical device requiring traceable firmware revisions and tamper resistance. IC Role / Device Role / Timing Role: Trusted code origin point; OTP register stores unique device ID and cryptographic signature keys. Use Value: Hardware WP pin prevents accidental overwrite during field service, meeting IEC 62304 software lifecycle requirements. |
Use Scenario: Shadowing MCU application code from Flash into SRAM for execution in a vehicle door module. IC Role / Device Role / Timing Role: High-speed instruction fetch source; 6 ns tV ensures zero-wait-state execution at 66 MHz SPI clock. Use Value: 66 MHz max frequency and continuous read wraparound support real-time CAN message processing without CPU stalls. |
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 W25Q20CLSNIG | 2 Mbit density, 1.65–1.95 V or 2.7–3.6 V supply; supports Quad SPI; no OTP register | Lacks hardware WP pin and 128-byte OTP; requires software-only protection schemes | Preferred where Quad SPI bandwidth or lower voltage operation is critical; not drop-in due to different protection model |
| Macronix MX25L2006EM1I-12G | 2 Mbit density, 2.7–3.6 V supply; 8-pin SOIC; supports standard SPI only; no deep power-down mode | Higher 25 µA standby current; lacks deep power-down and OTP security register | Valid alternative for cost-sensitive designs where ultra-low power and secure serialization are not required |
Compared with AT25DF021-SSHF-T, W25Q20CLSNIG offers higher interface flexibility but sacrifices hardware write protection and OTP security, while MX25L2006EM1I-12G provides identical package and pinout but omits deep power-down and OTP - making AT25DF021-SSHF-T optimal for secure, low-power embedded firmware storage.
Availability
AT25DF021-SSHF-T is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered IoT sensors, medical handheld diagnostics, automotive body controllers, and consumer appliance firmware storage requiring stable component supply across extended product lifecycles.
Supply support for AT25DF021-SSHF-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, specialized in low-power, high-reliability nonvolatile memory and analog ICs for industrial and IoT applications.
The AT25DF021-SSHF-T belongs to Adesto's DataFlash® family, engineered specifically for embedded systems needing robust, flexible, and secure serial Flash memory with fine-grained erase and protection capabilities.
FAQ
What is the operating voltage range for the AT25DF021-SSHF-T?
The AT25DF021-SSHF-T supports two supply ranges: 2.3 V to 3.6 V and 2.7 V to 3.6 V. This dual-range capability allows direct compatibility with both 2.5 V and 3.3 V system rails without level-shifting. Operation outside these ranges may cause undefined behavior or data corruption, and no separate programming voltage is required - all read, program, and erase functions execute from the same VCC rail.
Does the AT25DF021-SSHF-T support Quad SPI mode?
No, the AT25DF021-SSHF-T supports only standard SPI (single I/O) with Modes 0 and 3. It does not implement Dual or Quad SPI protocols. Its interface uses four dedicated pins - CS, SCK, SI, and SO - and does not share pins for bidirectional or multi-bit data transfer. For Quad SPI functionality, designers should consider alternatives such as Winbond's W25Q series.
How many sectors does the AT25DF021-SSHF-T have, and what is their size?
The AT25DF021-SSHF-T contains four physical sectors, each 64 KB in size (262,144 bytes total). Each sector can be individually protected using software commands (36h/39h) or locked permanently via the hardware WP pin. Sector boundaries align to 64-KB offsets (000000h, 010000h, 020000h, 030000h), and the device also supports smaller 4-KB and 32-KB erase blocks within those sectors.
What is the purpose of the HOLD pin on the AT25DF021-SSHF-T?
The HOLD pin on the AT25DF021-SSHF-T temporarily suspends ongoing SPI communication without deselecting the device or resetting internal state. When asserted (low), it freezes SCK and SI sampling and places SO in high-impedance - useful for interrupt servicing or bus arbitration. HOLD requires CS to be active and SCK low to engage, and does not affect self-timed operations like erase or program cycles already in progress.
Is the AT25DF021-SSHF-T still recommended for new designs?
No - the AT25DF021-SSHF-T is marked "Not Recommended for New Designs" in its official datasheet (3677F–DFLASH–5/2013). While fully functional and supported for existing production, Adesto recommends migration to newer DataFlash® devices such as the AT25SF041 or compatible successors offering enhanced security, higher densities, and extended lifecycle support. Aetrix Electronics maintains legacy inventory and provides obsolescence mitigation guidance for AT25DF021-SSHF-T users.
AT25DF021-SSHF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 50 MHz
- Write Cycle Time - Word, Page:
- 7µs, 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25DF021-SSHF-T FAQ
1.How can I place an order for AT25DF021-SSHF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021-SSHF-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 AT25DF021-SSHF-T reliable?
The price and inventory of AT25DF021-SSHF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF021-SSHF-T is usually 5 days.
3.What payment methods are accepted for AT25DF021-SSHF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021-SSHF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021-SSHF-T?
AT25DF021-SSHF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021-SSHF-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 AT25DF021-SSHF-T?
For technical support, including AT25DF021-SSHF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021-SSHF-T requirements.
6.How does Aetrix verify that AT25DF021-SSHF-T is sourced from the original manufacturer or authorized distributors?
All AT25DF021-SSHF-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 AT25DF021-SSHF-T meets industry standards.
7.What is the process for return or replacement of AT25DF021-SSHF-T?
All AT25DF021-SSHF-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021-SSHF-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 AT25DF021-SSHF-T part is unused and in its original packaging.
Return procedure for AT25DF021-SSHF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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