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Renesas AT25DF021-MHF-Y
- Part No.:
- AT25DF021-MHF-Y
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT25DF021-MHF-Y.pdf
- Description:
- IC FLASH 2MBIT SPI 50MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,319
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Product details
Overview
AT25DF021-MHF-Y 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 mixed code/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, delivers ≤6 ns clock-to-output delay, and features uniform 4/32/64-Kbyte block erase plus full chip erase - enabling efficient firmware updates and data logging in resource-constrained devices.
For engineers reviewing the AT25DF021-MHF-Y datasheet, AT25DF021-MHF-Y pinout, AT25DF021-MHF-Y application, or AT25DF021-MHF-Y equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain-ready procurement details - all grounded in the official 3677F–DFLASH–5/2013 datasheet and Renesas product documentation.
Technical Context
The AT25DF021-MHF-Y implements a dedicated SPI interface with hardware-controlled write protection via WP pin and suspend/resume capability via HOLD pin. Its memory array is partitioned into thirty-two 64-Kbyte sectors, each individually protectable, and supports four erase granularities (4/32/64-Kbyte blocks + full chip), eliminating need for external EEPROM in hybrid code-and-data applications.
It integrates a 128-byte one-time-programmable (OTP) security register for device serialization or key storage, and uses intelligent program/erase algorithms that auto-detect and flag failures via the EPE bit in the Status Register - enabling robust field firmware integrity verification without host-side overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes), organized as 32 × 64-Kbyte sectors - enables fine-grained firmware patching without erasing unrelated code modules. |
| Supply Voltage Range | 2.3V–3.6V or 2.7V–3.6V - compatible with both 2.5V and 3.3V system rails without level shifters. |
| Max SPI Clock Frequency | 66 MHz - supports high-throughput boot code loading and OTA update streaming. |
| Read Access Time | ≤6 ns clock-to-output (tV) - ensures minimal latency during instruction fetch from flash to RAM. |
| Erase Performance | 50 ms typical for 4-Kbyte block; 450 ms for 64-Kbyte block - balances speed and endurance for frequent data logging. |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - suitable for industrial control and medical device firmware lifecycles. |
| Power Consumption | 7 mA active read current (20 MHz); 15 μA deep power-down - extends battery life in always-on sensor nodes. |
Pinout & Package
AT25DF021-MHF-Y is packaged in an 8-lead SOIC (150-mil wide), RoHS-compliant, green package. Pin functions are electrically and mechanically defined per JEDEC MS-012, with no internal pull-ups on SCK/SI and internal pull-highs on WP/HOLD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; rising edge terminates all operations and places SO in high-Z - required for multi-device SPI bus arbitration. |
| SCK | Serial Clock | Master-generated clock; data latched on rising edge (SI), output on falling edge (SO) - defines timing for SPI Modes 0 and 3 only. |
| SI | Serial Input | Command/address/data input path; ignored when CS is deasserted - supports opcode-driven command set including sector protect/unprotect. |
| SO | Serial Output | Data output path; tri-stated when CS is high - enables daisy-chaining or shared-bus configurations with proper CS decoding. |
| WP | Write Protect | Hardware lock for protected sectors; low = enable protection enforcement - prevents accidental erase/program during power transients. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without deselecting device; requires CS asserted and SCK low - preserves state during interrupt servicing. |
| VCC | Power Supply | Single 2.3–3.6V rail; powers core logic and I/O buffers - eliminates need for separate VPP programming voltage. |
| GND | Ground Reference | System ground return; must be low-impedance connection to minimize noise coupling into sensitive read paths. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Erase Architecture | Uniform 4-Kbyte, 32-Kbyte, 64-Kbyte, and full-chip erase - reduces wasted space vs. large-block-only flash, enabling co-location of bootloader, app code, and runtime data. |
| Individual Sector Protection | Four 64-Kbyte sectors with software/hardware locking - allows secure OTA updates to application code while preserving calibration data in protected sectors. |
| 128-Byte OTP Security Register | One-time programmable storage for ESN, cryptographic keys, or manufacturing traceability - immune to field reprogramming or voltage glitch attacks. |
| Fast Page Programming | 1.0 ms typical for 256-byte page - accelerates firmware patch deployment and configuration parameter writes. |
| JEDEC ID Read Support | Standard 9Fh command returns manufacturer (0x1F) and device ID (0x47) - enables automated BOM validation and supply-chain authenticity checks. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers with field-deployed connectivity. IC Role / Device Role / Timing Role: Non-volatile code storage with atomic sector erase - enables safe in-field firmware upgrades without halting I/O scanning. Use Value: 4-Kbyte erase granularity minimizes downtime during partial updates; WP pin prevents corruption during brown-out events. |
Use Scenario: Holding certified bootloader and diagnostic routines in Class II medical instruments requiring regulatory audit trails. IC Role / Device Role / Timing Role: Secure, tamper-resistant boot memory with OTP serialization - satisfies IEC 62304 traceability requirements. Use Value: 128-byte OTP register stores unique device ID and revision hash; sector protection isolates bootloader from application partitions. |
| Smart Meter Data Logging | Automotive Body Control Module |
Use Scenario: Recording time-stamped energy consumption data across 10+ year deployments with infrequent writes. IC Role / Device Role / Timing Role: High-endurance data archive with deep power-down mode - extends battery life in AMI endpoints. Use Value: 15 μA deep power-down current and 100K-cycle endurance support >10 years of daily logging at 100-byte intervals. |
Use Scenario: Storing lighting control profiles and seat position presets in 12V automotive body ECUs. IC Role / Device Role / Timing Role: Low-voltage SPI flash with extended temperature operation - withstands under-hood thermal cycling (-40°C to +85°C). Use Value: 2.3V minimum operating voltage ensures reliable operation during cold-crank battery sag; 66 MHz read speed enables fast profile recall. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial SPI Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q20EW | 2 Mbit density, 1.65–1.95V or 2.7–3.6V dual supply; Quad SPI support; no HOLD pin; 3 ms typical 4-Kbyte erase. | Lacks HOLD pin and individual sector protection; supports faster Quad I/O but requires different driver stack. | Choose for cost-sensitive consumer designs needing Quad SPI bandwidth; avoid where HOLD or hardware WP is mandatory. |
| Macronix MX25L2006E | 2 Mbit density, 2.7–3.6V supply; SPI Modes 0/3; 66 MHz max; 4-Kbyte erase in 50 ms; includes HOLD and WP pins. | Identical pinout and command set; same 4/32/64-Kbyte erase architecture; supports same industrial temp range. | Drop-in replacement with identical timing, protection, and power specs - validated for seamless migration in existing layouts. |
Compared with AT25DF021-MHF-Y, W25Q20EW offers higher interface bandwidth but sacrifices HOLD functionality and sector-level hardware protection, while MX25L2006E matches all critical electrical, timing, and feature parameters - making it the preferred alternative for design continuity and supply resilience.
Availability
AT25DF021-MHF-Y is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, smart meter data logging, automotive body control modules, and connected IoT endpoint applications requiring stable component supply across long-lifecycle programs.
Supply support for AT25DF021-MHF-Y 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 the AT25DF series as ultra-low-power, high-reliability serial Flash for embedded systems; acquired by Dialog Semiconductor in 2020, then integrated into Renesas Electronics in 2021.
The AT25DF product line targets cost-optimized, low-voltage embedded applications demanding flexible erase granularity, hardware write protection, and long-term data retention - especially where EEPROM co-location is undesirable.
FAQ
What is the operating voltage range for the AT25DF021-MHF-Y?
The AT25DF021-MHF-Y supports two supply ranges: 2.3V to 3.6V or 2.7V to 3.6V. This dual-range capability allows direct integration into both 2.5V and 3.3V system rails without external regulators or level shifters. Operation outside these ranges may cause undefined behavior or data corruption, and is not guaranteed per the 3677F–DFLASH–5/2013 datasheet.
Does the AT25DF021-MHF-Y support Quad SPI mode?
No, the AT25DF021-MHF-Y supports only standard SPI (single I/O) in Modes 0 and 3. It does not implement Dual or Quad SPI protocols. The interface uses SI for input and SO for output exclusively; no additional data lines (IO2/IO3) or quad-specific opcodes are defined in its command set per the official datasheet.
How many sectors does the AT25DF021-MHF-Y have, and what is their size?
The AT25DF021-MHF-Y contains thirty-two physical sectors, each 64 Kbytes in size, totaling 2 Mbit (262,144 bytes). Each sector can be individually protected via software commands or locked permanently using the WP pin. Sector boundaries align to 64-Kbyte offsets (e.g., 0x000000–0x00FFFF), enabling precise isolation of firmware, config, and data regions.
What is the purpose of the HOLD pin on the AT25DF021-MHF-Y?
The HOLD pin on the AT25DF021-MHF-Y temporarily suspends ongoing SPI communication without deselecting the device or resetting internal state. When asserted (low), it ignores SCK transitions and SI data while placing SO in high-impedance - allowing the host MCU to service interrupts or perform other tasks mid-transfer. It requires CS to remain asserted and SCK low to activate.
Is the AT25DF021-MHF-Y still recommended for new designs?
No - the official datasheet (3677F–DFLASH–5/2013) explicitly marks AT25DF021 as "Not Recommended for New Designs." While actively manufactured and supported by Renesas for legacy continuity, new projects should evaluate successors like the ATXP021 or Renesas' newer Serial NOR families offering enhanced security, density, and QSPI support.
AT25DF021-MHF-Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tray
- 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-UDFN (5x6)
AT25DF021-MHF-Y FAQ
1.How can I place an order for AT25DF021-MHF-Y through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021-MHF-Y 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-MHF-Y reliable?
The price and inventory of AT25DF021-MHF-Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF021-MHF-Y is usually 5 days.
3.What payment methods are accepted for AT25DF021-MHF-Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021-MHF-Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021-MHF-Y?
AT25DF021-MHF-Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021-MHF-Y 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-MHF-Y?
For technical support, including AT25DF021-MHF-Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021-MHF-Y requirements.
6.How does Aetrix verify that AT25DF021-MHF-Y is sourced from the original manufacturer or authorized distributors?
All AT25DF021-MHF-Y 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-MHF-Y meets industry standards.
7.What is the process for return or replacement of AT25DF021-MHF-Y?
All AT25DF021-MHF-Y units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021-MHF-Y, 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-MHF-Y part is unused and in its original packaging.
Return procedure for AT25DF021-MHF-Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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