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Renesas AT25DF021-SSH-T
- Part No.:
- AT25DF021-SSH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DF021-SSH-T.pdf
- Description:
- IC FLASH 2MBIT SPI 70MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,837
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Product details
Overview
AT25DF021-SSH-T from Adesto Technologies (acquired by Dialog Semiconductor, now part of Renesas) is a 2-Mbit serial SPI Flash memory IC designed for code shadowing and data storage in embedded systems. It operates from a single 2.3V–3.6V or 2.7V–3.6V supply, supports SPI Modes 0/3 up to 66 MHz, features uniform 4/32/64-Kbyte block erase, and includes hardware write protection via WP pin and a 128-byte OTP security register.
For engineers reviewing the AT25DF021-SSH-T datasheet, AT25DF021-SSH-T pinout, AT25DF021-SSH-T application, or AT25DF021-SSH-T equivalent, this page delivers verified electrical parameters, SOIC-8 pin mapping, sector protection behavior, timing-critical erase/program performance, and industrial-temperature-grade reliability for firmware storage, boot code retention, and secure configuration data handling.
Technical Context
The AT25DF021-SSH-T implements a dedicated SPI interface with rising-edge input sampling (SI, CS setup) and falling-edge output sampling (SO), supporting both high-speed (0Bh opcode, up to 66 MHz) and legacy (03h opcode, up to 33 MHz) read modes. Its internal address counter enables continuous sequential reads with automatic wraparound at 03FFFFh.
It uses a hierarchical erase architecture: four 64-Kbyte sectors, each subdivided into sixteen 4-Kbyte blocks and two 32-Kbyte blocks. Sector protection is controlled via software commands (36h/39h) and hardware locking (WP pin low), while the Status Register's WEL bit enforces explicit write enable/disable sequencing before all program/erase/protection operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes), organized as 64 Kbyte sectors × 4 with uniform 4/32/64-Kbyte erase granularity |
| Supply Voltage | 2.3V–3.6V or 2.7V–3.6V - single-rail operation; no VPP required for programming/erasing |
| Max Clock Frequency | 66 MHz - enables ≤6 ns clock-to-output (tV) for high-throughput firmware reads |
| Erase Performance | 50 ms typical 4-Kbyte block erase; 250 ms typical 32-Kbyte block erase; 450 ms typical 64-Kbyte block erase |
| Program Performance | 1.0 ms typical page program (256 bytes); supports byte-wise or 1–256-byte page writes |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention at full industrial temperature range (−40°C to +85°C) |
| Power Consumption | 7 mA typical active read current at 20 MHz; 15 μA typical deep power-down current |
Pinout & Package
AT25DF021-SSH-T is packaged in an 8-lead SOIC (150-mil wide), RoHS-compliant, green package. Pin functions are electrically validated per Adesto datasheet 3677F–DFLASH–5/2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; high-to-low transition initiates command sequence; device enters standby (not deep power-down) when deasserted |
| SCK | Serial Clock | Input clock; data latched on rising edge (SI), output shifted on falling edge (SO); supports SPI Modes 0 and 3 |
| SI | Serial Input | Command, address, and data input; ignored when CS is high; MSB-first protocol |
| SO | Serial Output | Data output during read/status operations; high-impedance when CS is deasserted |
| WP | Write Protect | Hardware lock control; low = enables sector protection lock; internally pulled high; can be left floating if unused |
| HOLD | Hold | Pauses ongoing SPI transfer without deselecting device; requires CS asserted and SCK low to activate; internally pulled high |
| VCC | Power Supply | 2.3V–3.6V or 2.7V–3.6V supply; invalid voltage may cause spurious operation |
| GND | Ground | System ground reference; must be connected to minimize noise and ensure reliable erase/program verification |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Erase Architecture | Four independent 64-Kbyte sectors, each erasable as 4-Kbyte, 32-Kbyte, 64-Kbyte blocks, or full chip - minimizes wasted space in mixed code/data layouts |
| Hardware + Software Protection | WP pin locks protected sectors permanently; software commands (36h/39h) allow dynamic sector-level protect/unprotect during field updates |
| OTP Security Register | 128-byte one-time programmable area for ESN, device serialization, or cryptographic key storage - irreversible and tamper-resistant |
| Intelligent Error Detection | Automatic reporting of program/erase failures via EPE bit in Status Register - eliminates need for external verification polling |
| Deep Power-Down Mode | 15 μA typical current draw with ABh resume command - extends battery life in portable or energy-constrained IoT endpoints |
Applications
| Boot Code Storage | Firmware Over-the-Air (OTA) Update |
|---|---|
Use Scenario: Storing primary bootloader and initial firmware image in microcontroller-based edge devices requiring cold-start reliability. IC Role / Device Role / Timing Role: Non-volatile code storage with fast random-access read capability (66 MHz SPI) and deterministic 6 ns tV for minimal boot latency. Use Value: Uniform 4-Kbyte erase enables patching of small bootloader sections without disturbing adjacent code, reducing OTA update time and flash wear. | Use Scenario: Hosting dual-bank firmware images in smart meters or industrial gateways where field updates must preserve operational continuity. IC Role / Device Role / Timing Role: Dual-image storage with sector-level protection - one bank active, one bank updated - enforced via hardware WP and software sector unprotect. Use Value: Prevents accidental corruption during power loss mid-update; 100K endurance ensures >10 years of field upgrades at monthly intervals. |
| Secure Configuration Data | Embedded System Logging |
Use Scenario: Storing calibrated sensor offsets, network credentials, and device-specific keys in medical or automotive ECUs. IC Role / Device Role / Timing Role: Secure non-volatile storage using 128-byte OTP register for immutable keys and software-controlled 64-Kbyte sector for mutable config data. Use Value: Hardware write lock (WP) prevents runtime overwrite of critical keys; individual sector protection isolates config changes from firmware regions. | Use Scenario: Capturing diagnostic logs, error traces, or usage metrics in industrial PLCs or HVAC controllers with limited RAM. IC Role / Device Role / Timing Role: High-endurance data buffer supporting frequent small writes (1–256 bytes) and periodic bulk erase of aged log blocks. Use Value: 1.0 ms page program time enables real-time logging without CPU blocking; 4-Kbyte block erase clears obsolete logs with minimal system interruption. |
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 W25Q20EW | 2 Mbit density, same SOIC-8 package, but supports Quad SPI (QPI) and DTR mode; faster 104 MHz read; no HOLD pin; different status register layout | Enables higher throughput in QPI-capable hosts; lacks HOLD functionality for pause-on-demand; requires firmware rework for status/register access | Select W25Q20EW only if host supports QPI and HOLD is unnecessary; verify OTP and protection command compatibility before migration |
| Macronix MX25L2006E | 2 Mbit, SOIC-8, supports SPI Modes 0/3, 80 MHz max clock, 5 ms typical 4-Kbyte erase, but no OTP register and no hardware WP pin - protection is software-only | Lower cost alternative where secure key storage is not required; software-only protection increases risk of accidental erase during debug sessions | Choose MX25L2006E for cost-sensitive consumer applications without security requirements; avoid where hardware write lock or OTP is mandated |
Compared with W25Q20EW and MX25L2006E, the AT25DF021-SSH-T uniquely combines hardware WP locking, 128-byte OTP, and HOLD pin support - making it optimal for safety-critical or secure-boot designs where deterministic protection and debug resilience are essential.
Availability
AT25DF021-SSH-T is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive telematics modules requiring stable component supply across extended product lifecycles.
Supply support for AT25DF021-SSH-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-reliability non-volatile memory and analog interface solutions for IoT and embedded markets.
The AT25DF021 belongs to Adesto's DataFlash family, engineered specifically for robust code+data co-storage in resource-constrained 2.5V/3V systems - emphasizing sector flexibility, hardware security, and industrial-grade endurance.
FAQ
What is the maximum operating frequency supported by the AT25DF021-SSH-T?
The AT25DF021-SSH-T supports a maximum clock frequency of 66 MHz for all operations including read, program, and erase. At this rate, its clock-to-output delay (tV) is guaranteed ≤6 ns, enabling high-speed firmware execution in microcontroller boot scenarios. The device also supports a lower-speed 03h read opcode up to 33 MHz for compatibility with legacy SPI masters.
Does the AT25DF021-SSH-T require a separate programming voltage (VPP)?
No, the AT25DF021-SSH-T does not require a separate programming or erase voltage. All program and erase operations execute using only the core supply voltage (VCC) in the range of 2.3V–3.6V or 2.7V–3.6V. This simplifies power design and eliminates need for charge pumps or external VPP circuitry - a key advantage over older parallel or multi-voltage Flash devices.
How does hardware write protection work on the AT25DF021-SSH-T?
Hardware write protection on the AT25DF021-SSH-T is controlled by the WP pin: when held low, it locks all currently protected sectors against program and erase commands, regardless of software state. The WP pin is internally pulled high, so it may be left floating if unused - though external connection to VCC is recommended for noise immunity. This complements software-based sector protection for defense-in-depth security.
Can the AT25DF021-SSH-T be used in industrial temperature environments?
Yes, the AT25DF021-SSH-T is fully specified for the industrial temperature range of −40°C to +85°C. Its 20-year data retention and 100,000 program/erase cycles are guaranteed across this full range, and its low 15 μA deep power-down current remains stable under thermal stress - making it suitable for deployment in factory automation, outdoor infrastructure, and automotive under-hood applications.
What is the function of the HOLD pin on the AT25DF021-SSH-T?
The HOLD pin on the AT25DF021-SSH-T allows temporary suspension of an ongoing SPI transaction without deselecting the device or resetting internal state. When asserted (low), it freezes SCK and SI sampling and places SO in high-impedance - preserving command context. This is especially useful during interrupt servicing or bus arbitration in real-time systems, and the pin is internally pulled high for safe default operation.
AT25DF021-SSH-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:
- 70 MHz
- Write Cycle Time - Word, Page:
- 7µs, 5ms
- 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
AT25DF021-SSH-T FAQ
1.How can I place an order for AT25DF021-SSH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021-SSH-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-SSH-T reliable?
The price and inventory of AT25DF021-SSH-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-SSH-T is usually 5 days.
3.What payment methods are accepted for AT25DF021-SSH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021-SSH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021-SSH-T?
AT25DF021-SSH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021-SSH-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-SSH-T?
For technical support, including AT25DF021-SSH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021-SSH-T requirements.
6.How does Aetrix verify that AT25DF021-SSH-T is sourced from the original manufacturer or authorized distributors?
All AT25DF021-SSH-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-SSH-T meets industry standards.
7.What is the process for return or replacement of AT25DF021-SSH-T?
All AT25DF021-SSH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021-SSH-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-SSH-T part is unused and in its original packaging.
Return procedure for AT25DF021-SSH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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