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Renesas AT25DF021-MH-T
- Part No.:
- AT25DF021-MH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT25DF021-MH-T.pdf
- Description:
- IC FLASH 2MBIT SPI 70MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,976
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Product details
Overview
AT25DF021-MH-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 mixed code/data storage in embedded systems. It operates from a single 2.3V–3.6V supply, supports SPI Modes 0/3 up to 66 MHz, delivers 6 ns clock-to-output timing, and features uniform 4/32/64-Kbyte erase blocks plus full-chip erase.
For engineers reviewing the AT25DF021-MH-T datasheet, AT25DF021-MH-T pinout, AT25DF021-MH-T application, or AT25DF021-MH-T equivalent, key selection considerations include its flexible sector protection architecture, 128-byte OTP security register, industrial temperature range (–40°C to +85°C), and dual green package options: 8-lead SOIC (150-mil) and 8-pad Ultra Thin DFN (5 × 6 × 0.6 mm).
Technical Context
The AT25DF021-MH-T implements a dedicated SPI interface with hardware-controlled write protection via the WP pin and suspend/resume capability via the HOLD pin. Its internal architecture includes a 2-Mbit (262,144-byte) flash array segmented into four 64-Kbyte sectors, each individually protectable, with erase granularity down to 4 Kbytes - enabling efficient code patching and data logging without over-erasing.
It uses a status register with Write Enable Latch (WEL), Write In Progress (WIP), Erase/Program Error (EPE), and Block Protect (BP) bits, supporting automatic failure detection and reporting. All program/erase operations are internally self-timed and verified, with no external voltage required beyond VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes) - sufficient for boot code, firmware images, and configuration data in space-constrained designs. |
| Supply Voltage | 2.3V–3.6V or 2.7V–3.6V - compatible with 2.5V and 3.3V logic domains without level shifting. |
| Max Clock Frequency | 66 MHz - enables high-throughput read access with tV ≤ 6 ns, critical for real-time code execution. |
| Erase Granularity | Uniform 4-Kbyte / 32-Kbyte / 64-Kbyte blocks + full chip - minimizes wasted space during partial updates. |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention - validated for long-life industrial deployments. |
| Power Consumption | 7 mA active read current (20 MHz), 15 μA deep power-down - supports low-power modes in battery-backed systems. |
| Operating Temperature | –40°C to +85°C - meets full industrial grade requirements for automotive infotainment, PLCs, and IoT edge nodes. |
Pinout & Package
AT25DF021-MH-T is available in two RoHS-compliant, halogen-free packages: 8-lead SOIC (150-mil wide) and 8-pad Ultra Thin DFN (5 × 6 × 0.6 mm). Both share identical pinout and functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; rising edge ends all operations and places SO in high-impedance state. |
| SCK | Serial Clock | Input clock controlling data transfer timing; data latched on rising edge, output on falling edge (SPI Modes 0/3). |
| SI | Serial Input | Command, address, and data input line; ignored when CS is deasserted. |
| SO | Serial Output | Data output line; high-impedance when CS is deasserted or during HOLD assertion. |
| WP | Write Protect | Hardware lock for protected sectors; low-active; internally pulled high - can be left floating if unused. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfers without deselecting device; requires CS asserted and SCK low to activate. |
| VCC | Power Supply | Single 2.3V–3.6V supply; powers all internal logic and memory array - no VPP required. |
| GND | Ground Reference | System ground return path; must be connected to minimize noise and ensure reliable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Erase Architecture | Supports 4-Kbyte, 32-Kbyte, 64-Kbyte, and full-chip erase - reduces memory fragmentation in firmware update and data logging applications. |
| Individual Sector Protection | Four 64-Kbyte sectors with software/hardware locking - enables secure code partitioning and safe field updates without risking bootloader corruption. |
| 128-Byte OTP Security Register | One-time programmable space for ESN, device serialization, or cryptographic keys - enhances system-level security and traceability. |
| Fast Program/Erase Times | 1.0 ms typical page program (256 bytes); 50 ms typical 4-Kbyte block erase - accelerates manufacturing programming and field firmware upgrades. |
| JEDEC ID & Deep Power-Down | Standard manufacturer/device ID read (9Fh); 15 μA deep power-down mode - simplifies BOM management and extends battery life in portable devices. |
Applications
| Industrial HMI Panels | Medical Diagnostic Devices |
|---|---|
Use Scenario: Storing boot firmware, UI assets, and calibration tables in panel-mounted HMIs with limited PCB area. IC Role / Device Role / Timing Role: Non-volatile code and data storage with fast random-access reads and atomic sector updates. Use Value: Uniform 4-Kbyte erase enables incremental firmware patches without full reflash, reducing downtime during maintenance. |
Use Scenario: Holding patient-specific configuration profiles and diagnostic algorithm binaries in portable ultrasound or ECG units. IC Role / Device Role / Timing Role: Secure, long-retention storage for regulatory-compliant medical data and certified firmware images. Use Value: Hardware WP pin and OTP register support tamper-resistant storage of calibration keys and device IDs per IEC 62304. |
| Smart Energy Meters | Automotive Body Control Modules |
Use Scenario: Logging time-stamped energy consumption data and storing tariff schedules in DIN-rail mounted meters. IC Role / Device Role / Timing Role: High-endurance data logger with sector-protected firmware region and independent data region. Use Value: 100,000-cycle endurance and 20-year retention meet ANSI C12.22 and DLMS/COSEM long-service-life requirements. |
Use Scenario: Storing lighting control logic, seat position maps, and CAN gateway firmware in 12V automotive ECUs. IC Role / Device Role / Timing Role: SPI-connected flash for boot code and runtime parameter storage in ASIL-B compliant subsystems. Use Value: Industrial temperature range (–40°C to +85°C) and robust erase verification ensure reliability under under-hood thermal cycling. |
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, 1.65V–3.6V supply, 104 MHz max clock, Quad SPI support - higher speed but no HOLD pin or OTP register. | Lacks hardware HOLD and 128-byte OTP; better suited for high-speed read-heavy applications than secure firmware update scenarios. | Select W25Q20EW only if Quad SPI bandwidth is required and sector-level hardware protection is not critical. |
| Micron MT25QL02G | 2-Gbit density (1000× larger), 1.7V–2.0V/2.7V–3.6V dual supply, 133 MHz, Octal DTR - vastly higher capacity and speed, incompatible pinout and voltage. | Not drop-in; requires redesign for voltage translation, layout, and command set - suitable only for new high-performance platforms. | MT25QL02G is not a functional replacement; consider only for greenfield designs needing >1 Gbit capacity and DDR interface. |
Compared with W25Q20EW and MT25QL02G, the AT25DF021-MH-T uniquely balances industrial-grade reliability, hardware write protection, OTP security, and compact 2-Mbit density - making it optimal for cost-sensitive, safety-aware embedded systems where pin compatibility and proven field longevity matter more than raw speed or scale.
Availability
AT25DF021-MH-T is available at Aetrix Electronics and suitable for industrial HMI panels, medical diagnostic devices, smart energy meters, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT25DF021-MH-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 developed ultra-low-power, high-reliability non-volatile memory solutions before its acquisition by Dialog Semiconductor in 2020; Dialog was subsequently acquired by Renesas Electronics in 2021.
The AT25DF021-MH-T belongs to Adesto's DataFlash® family - engineered specifically for embedded systems demanding efficient code shadowing, secure firmware updates, and robust data logging in resource-constrained environments.
FAQ
What is the operating voltage range of the AT25DF021-MH-T?
The AT25DF021-MH-T operates from a single supply of 2.3V to 3.6V or 2.7V to 3.6V, making it compatible with both 2.5V and 3.3V system rails without external level shifters. This dual-range support ensures flexibility in mixed-voltage designs while maintaining full functionality across the specified range.
Does the AT25DF021-MH-T support SPI Mode 1 or Mode 2?
No, the AT25DF021-MH-T supports only SPI Modes 0 and 3 - defined by clock polarity (CPOL) and phase (CPHA) settings. In both supported modes, data is latched on the rising edge of SCK and output on the falling edge. Modes 1 and 2 are not implemented and will not function reliably with the AT25DF021-MH-T.
How does the hardware write protection (WP pin) interact with software sector protection?
The WP pin on the AT25DF021-MH-T provides hardware-level locking of all protected sectors - it overrides software unprotect commands when asserted low. If WP is held low, no sector can be unprotected or modified, even if the Status Register is written. This creates a physical "lockout" layer complementary to the four software-controllable 64-Kbyte sector protection bits.
Can the AT25DF021-MH-T be used in place of the AT25DF041 or AT25DF081?
No - the AT25DF021-MH-T is not pin-compatible or functionally interchangeable with the AT25DF041 (4-Mbit) or AT25DF081 (8-Mbit) variants. While they share the same command set and package footprint, differences in memory map size, status register bit definitions, and timing parameters require explicit firmware validation. Direct substitution may cause addressing errors or failed erase/program operations.
What is the purpose of the HOLD pin on the AT25DF021-MH-T?
The HOLD pin on the AT25DF021-MH-T allows temporary suspension of SPI communication without deselecting the device or resetting internal state. When asserted low (with CS high and SCK low), it places SO in high-impedance and ignores SI/SCK transitions - preserving the current command context. This is especially useful during interrupt servicing or multi-master arbitration in real-time systems using the AT25DF021-MH-T.
AT25DF021-MH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- 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-UDFN (5x6)
AT25DF021-MH-T FAQ
1.How can I place an order for AT25DF021-MH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021-MH-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-MH-T reliable?
The price and inventory of AT25DF021-MH-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-MH-T is usually 5 days.
3.What payment methods are accepted for AT25DF021-MH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021-MH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021-MH-T?
AT25DF021-MH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021-MH-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-MH-T?
For technical support, including AT25DF021-MH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021-MH-T requirements.
6.How does Aetrix verify that AT25DF021-MH-T is sourced from the original manufacturer or authorized distributors?
All AT25DF021-MH-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-MH-T meets industry standards.
7.What is the process for return or replacement of AT25DF021-MH-T?
All AT25DF021-MH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021-MH-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-MH-T part is unused and in its original packaging.
Return procedure for AT25DF021-MH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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