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Renesas AT25DF021-SSH-B
- Part No.:
- AT25DF021-SSH-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DF021-SSH-B.pdf
- Description:
- IC FLASH 2MBIT SPI 70MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,641
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Product details
Overview
AT25DF021-SSH-B 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 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, delivers ≤6 ns clock-to-output delay, and features uniform 4/32/64-Kbyte erase blocks - enabling efficient mixed code+data partitioning in industrial controllers and IoT edge nodes.
For engineers reviewing the AT25DF021-SSH-B datasheet, AT25DF021-SSH-B pinout, AT25DF021-SSH-B application, or AT25DF021-SSH-B equivalent, this page provides verified functional identity, validated pin-level interface behavior, confirmed erase/program timing under real operating conditions, sector protection logic implementation details, and direct alternative options with documented compatibility boundaries.
Technical Context
The AT25DF021-SSH-B implements a dedicated SPI-compatible flash memory controller with hardware-managed write enable latch (WEL), status register polling support, and intelligent program/erase failure detection via EPE flag. Its memory array is physically segmented into thirty-two 64-Kbyte sectors, each individually protectable via software command (36h/39h) or hardware WP pin assertion.
It supports three block erase granularities (4/32/64 Kbytes) and full-chip erase (60h/C7h), all internally self-timed with typical durations of 50 ms, 250 ms, and 450 ms respectively. The device uses MSB-first byte-aligned SPI framing, requires CS assertion before opcode transmission, and enforces even-byte-boundary CS deassertion for command completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes) - sufficient for boot firmware + configuration data in compact MCU-based designs |
| Supply Voltage Range | 2.3–3.6 V or 2.7–3.6 V - compatible with 2.5 V and 3.3 V system rails without level shifting |
| Max SPI Clock Frequency | 66 MHz - enables high-throughput read access with ≤6 ns tV for timing-critical applications |
| Erase Granularity | Uniform 4-Kbyte / 32-Kbyte / 64-Kbyte blocks - allows precise over-the-air update of firmware modules without disturbing adjacent code |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention - validated for long-life industrial deployment |
| Power Consumption | 7 mA active read current (20 MHz), 15 μA deep power-down - supports ultra-low-power sleep modes |
| OTP Security Register | 128-byte one-time programmable area - used for device serialization, ESN storage, or cryptographic key binding |
Pinout & Package
AT25DF021-SSH-B is packaged in an 8-lead SOIC (150-mil wide), RoHS-compliant, green package with standard JEDEC footprint. Pin functions are electrically isolated and fully SPI-bus compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable signal; rising edge terminates operations and places SO in high-Z state |
| SCK | Serial clock input | Controls data sampling (SI latched on rising edge, SO driven on falling edge); supports up to 66 MHz |
| SI | Serial input | Accepts opcodes, addresses, and data; ignored when CS is deasserted |
| SO | Serial output | Drives read data and status bits; high-impedance when CS is deasserted |
| WP | Hardware write protect input | Low-active pin that locks protected sectors; internally pulled high; optional external tie to VCC |
| HOLD | Communication pause input | Halts ongoing SPI transfer without deselecting device; requires CS asserted and SCK low to activate |
| VCC | Power supply | Single 2.3–3.6 V rail powers all internal logic and memory array; no auxiliary voltage required |
| GND | Ground reference | Common return path for VCC and all I/O signals; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Flexible erase architecture | Supports 4-Kbyte, 32-Kbyte, 64-Kbyte, and full-chip erase - minimizes wasted space in mixed code/data layouts |
| Individual sector protection | Four 64-Kbyte sectors with independent software/hardware lock control - enables secure firmware patching without exposing entire memory |
| OTP security register | 128-byte one-time programmable area - used for immutable device ID, ESN, or encrypted key storage |
| Fast program/erase performance | 1.0 ms typical page program (256 bytes), 50 ms typical 4-Kbyte block erase - reduces firmware update latency |
| JEDEC-standard identification | Manufacturer and device ID readable via 9Fh command - ensures interoperability with standard flash programming tools |
Applications
| Firmware Boot Storage | Data Logging in Edge Sensors |
|---|---|
|
Use Scenario: Storing bootloader and application firmware for ARM Cortex-M microcontrollers in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random-access read capability and deterministic 6 ns tV for instruction fetch timing. Use Value: Enables reliable cold-start execution and supports field firmware updates via 4-Kbyte block erase without disrupting sensor calibration data stored elsewhere. |
Use Scenario: Capturing timestamped temperature/humidity readings in industrial predictive maintenance gateways. IC Role / Device Role / Timing Role: Data buffer with wear-leveling enabled by uniform 4-Kbyte erase blocks and 100K-cycle endurance. Use Value: Allows cyclic overwrite of oldest log entries while preserving firmware integrity through sector-level protection boundaries. |
| Secure Configuration Storage | Consumer Appliance Control Memory |
|
Use Scenario: Storing calibrated motor parameters and user preferences in medical infusion pumps with regulatory traceability requirements. IC Role / Device Role / Timing Role: Tamper-resistant configuration repository using OTP register for unique device serialization and WP-pin hardware lock. Use Value: Meets IEC 62304 data integrity requirements by preventing accidental writes during power transitions or EMI events. |
Use Scenario: Holding UI language packs, display assets, and safety-critical state machine definitions in smart home thermostats. IC Role / Device Role / Timing Role: Low-voltage (2.3 V min) serial flash supporting dual-role as both boot source and runtime data store. Use Value: Reduces BOM count by eliminating separate EEPROM, while maintaining 20-year data retention across product lifetime. |
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, 1.65–1.95 V supply, DFN-8 package only - lacks SOIC option and 2.3 V min operation | Targeted at ultra-low-voltage wearable devices; not drop-in for 2.5 V/3.3 V industrial systems | Select only if system operates below 2.3 V and DFN packaging is acceptable |
| Macronix MX25L2006E | 2 Mbit density, 2.7–3.6 V supply, supports 80 MHz SPI, includes Quad SPI mode - no 2.3 V min support | Better throughput for high-speed read-heavy applications; incompatible with sub-2.7 V brownout scenarios | Prefer when >66 MHz read bandwidth is required and voltage margin above 2.7 V is guaranteed |
Compared with AT25DF021-SSH-B, W25Q20EW enables lower-voltage operation but sacrifices SOIC compatibility and industrial voltage range, while MX25L2006E offers higher speed and Quad SPI but removes 2.3 V functionality - making AT25DF021-SSH-B uniquely suited for mixed-voltage legacy industrial designs requiring proven SOIC fit.
Availability
AT25DF021-SSH-B is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostic peripherals, and automotive body electronics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for AT25DF021-SSH-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 developed low-power, high-reliability nonvolatile memory solutions before its acquisition by Dialog Semiconductor in 2020; Dialog was subsequently acquired by Renesas Electronics in 2021.
The AT25DF021-SSH-B belongs to Adesto's DataFlash® family, engineered specifically for embedded systems needing efficient code+data co-storage with robust sector protection and minimal power consumption in extended-temperature environments.
FAQ
What is the operating voltage range supported by the AT25DF021-SSH-B?
The AT25DF021-SSH-B supports two supply ranges: 2.3 V to 3.6 V and 2.7 V to 3.6 V. This dual-range capability allows reliable operation across brownout conditions down to 2.3 V while maintaining full functionality - critical for battery-backed systems where voltage sag occurs during peak load. The AT25DF021-SSH-B does not require separate VPP or programming voltages.
Does the AT25DF021-SSH-B support Quad SPI or other enhanced interfaces?
No, the AT25DF021-SSH-B supports only standard single-data-line SPI (Modes 0 and 3) with SI and SO pins. It does not implement Dual SPI, Quad SPI, or QPI modes. All commands, addressing, and data transfers use the basic four-wire SPI bus (CS, SCK, SI, SO), ensuring compatibility with legacy microcontroller SPI peripherals without requiring additional GPIO or protocol translation.
How is sector protection implemented on the AT25DF021-SSH-B?
The AT25DF021-SSH-B implements sector protection through both software and hardware mechanisms: four 64-Kbyte sectors can be individually locked/unlocked via 36h/39h commands, and the WP pin provides hardware-level write inhibition when pulled low. Protection status is stored in nonvolatile sector registers and persists across power cycles. The AT25DF021-SSH-B also supports global protect/unprotect via status register manipulation.
What are the typical erase times for different block sizes on the AT25DF021-SSH-B?
The AT25DF021-SSH-B exhibits typical erase times of 50 ms for 4-Kbyte blocks, 250 ms for 32-Kbyte blocks, and 450 ms for 64-Kbyte blocks. These values are measured under standard conditions (VCC = 3.0 V, TA = 25°C) and reflect internally self-timed operations. Status register polling (via 05h command) is recommended to avoid fixed delays and improve system responsiveness during firmware updates.
Is the AT25DF021-SSH-B still recommended for new designs?
No - the AT25DF021-SSH-B is marked "Not Recommended for New Designs" in its official datasheet (3677F–DFLASH–5/2013). While actively manufactured and supported for existing programs, Renesas recommends migration paths such as the AT25SF021 or newer Adesto EcoXiP series for new projects requiring extended longevity, enhanced security, or higher performance. Aetrix Electronics maintains full supply continuity for AT25DF021-SSH-B in legacy production.
AT25DF021-SSH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-B FAQ
1.How can I place an order for AT25DF021-SSH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021-SSH-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 AT25DF021-SSH-B reliable?
The price and inventory of AT25DF021-SSH-B 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-B is usually 5 days.
3.What payment methods are accepted for AT25DF021-SSH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021-SSH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021-SSH-B?
AT25DF021-SSH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021-SSH-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 AT25DF021-SSH-B?
For technical support, including AT25DF021-SSH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021-SSH-B requirements.
6.How does Aetrix verify that AT25DF021-SSH-B is sourced from the original manufacturer or authorized distributors?
All AT25DF021-SSH-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 AT25DF021-SSH-B meets industry standards.
7.What is the process for return or replacement of AT25DF021-SSH-B?
All AT25DF021-SSH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021-SSH-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 AT25DF021-SSH-B part is unused and in its original packaging.
Return procedure for AT25DF021-SSH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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