My Inquiry
My Account
Renesas AT25DF021A-SSHN-B
.jpg)
- Part No.:
- AT25DF021A-SSHN-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DF021A-SSHN-B.pdf
- Description:
- IC FLASH 2MBIT SPI 104MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,900
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT25DF021A-SSHN-B from Renesas Electronics is a 2-Mbit serial SPI Flash memory IC optimized for code shadowing and mixed code/data storage in embedded systems. It operates from 1.65 V to 3.6 V across –40°C to +85°C, supports Dual-I/O read mode at up to 104 MHz, delivers 6 ns clock-to-output timing, and features uniform 4-kByte/32-kByte/64-kByte block erase plus 256-Byte page erase.
For engineers reviewing the AT25DF021A-SSHN-B datasheet, AT25DF021A-SSHN-B pinout, AT25DF021A-SSHN-B application, or AT25DF021A-SSHN-B equivalent, key selection considerations include its dual-I/O read capability, ultra-low 200 nA deep power-down current, hardware write protection via WP pin, OTP security register with factory-unique ID, and compatibility with SPI Modes 0 and 3 in industrial temperature range.
Technical Context
The AT25DF021A-SSHN-B implements a flexible SPI-compatible interface with dedicated SI (I/O0) and SO (I/O1) pins enabling Dual-Output Read operation-delivering two bits per SCK falling edge. Its internal architecture includes SRAM data buffer, Y/X decoders, and control logic supporting byte/page program, sequential programming, and four-tiered erase (page, 4-kB, 32-kB, 64-kB, full chip).
Hardware-based sector protection is enforced via the WP pin (active-low), while software-controlled locking uses status register bits. The device integrates a 128-byte OTP security register-64 bytes factory-programmed with unique identifier, 64 bytes user-programmable-and supports JEDEC-standard Manufacturer/Device ID readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes) - sufficient for firmware images, boot code, and configuration data in space-constrained MCU systems. |
| Interface | SPI-compatible, Modes 0 and 3 - ensures interoperability with standard microcontroller SPI peripherals without custom timing logic. |
| Max Clock Frequency | 104 MHz - enables high-speed code fetch and reduces boot time in real-time embedded applications. |
| Read Latency | 6 ns clock-to-output (tV) - minimizes instruction fetch delay during code execution from flash. |
| Erase Granularity | 256-Byte page, 4-kB/32-kB/64-kB uniform blocks - allows precise over-the-air (OTA) updates without erasing unrelated code or data sectors. |
| Power Consumption | 200 nA ultra-deep power-down current - extends battery life in always-on IoT edge nodes during sleep cycles. |
| Endurance & Retention | 100,000 P/E cycles at –40°C to +85°C; 20-year data retention - meets long-life requirements for industrial controllers and medical devices. |
Pinout & Package
AT25DF021A-SSHN-B is packaged in an 8-lead SOIC (150-mil) with gull-wing leads, RoHS-compliant and green-qualified. Pin functions are fully SPI-compatible with dual-I/O support enabled via SI/I/O0 and SO/I/O1 reconfiguration during Dual-Output Read commands.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high→low to initiate command sequence and low→high to terminate - critical for multi-device SPI bus arbitration. |
| SCK | Serial Clock | Master-generated clock; rising edge latches input (SI), falling edge clocks output (SO) - defines timing window for reliable data sampling. |
| SI (I/O0) | Serial Input / Dual-I/O Data Line 0 | Primary command/address/data input; becomes I/O0 output during Dual-Output Read - enables 2-bit parallel data transfer per SCK cycle. |
| SO (I/O1) | Serial Output / Dual-I/O Data Line 1 | Standard output during single-I/O reads; remains I/O1 output in Dual-Output mode - pairs with SI/I/O0 for doubled throughput. |
| WP | Write Protect | Active-low hardware lock for sector protection - prevents accidental writes/erases when tied to GND; internally pulled high for safe default state. |
| HOLD | Hold Control | Active-low pause signal; suspends ongoing SPI transaction without deselecting device - preserves state during interrupt servicing or bus sharing. |
| VCC | Supply Voltage | 1.65 V–3.6 V single supply - eliminates need for voltage translators in mixed-voltage systems (e.g., 1.8 V or 3.3 V MCUs). |
| GND | Ground Reference | Common return path for all digital and analog circuitry - requires low-impedance connection to minimize noise coupling into read operations. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-I/O Read Mode | Delivers 208 MB/s effective read bandwidth at 104 MHz - accelerates boot loading and firmware verification in resource-limited hosts. |
| Flexible Erase Architecture | Supports 256-Byte page erase alongside 4-kB/32-kB/64-kB blocks - enables fine-grained OTA updates without compromising code integrity or requiring external RAM buffering. |
| OTP Security Register | 128-byte field with 64-byte factory-unique ID + 64-byte user-programmable space - provides tamper-resistant device serialization and secure key storage for bootloader authentication. |
| Ultra-Low Power States | 200 nA ultra-deep power-down and 4.5 µA deep power-down - extends operational lifetime in battery-powered sensors and wearables between wake cycles. |
| Hardware Write Protection | WP pin enables physical lock of protected sectors independent of software state - prevents corruption during brown-out or firmware crash scenarios. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code |
|---|---|
|
Use Scenario: Storing firmware and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile code storage with fast random-access read and robust sector protection against field update errors. Use Value: 100,000 P/E cycles and 20-year retention ensure firmware longevity across 10+ year product lifecycles without replacement. |
Use Scenario: Holding certified boot loader and safety-critical configuration data in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-evident storage for bootloader integrity verification using factory-programmed unique ID. Use Value: OTP register enables cryptographic binding of firmware to hardware identity, satisfying IEC 62304 traceability requirements. |
| Smart Meter Firmware Update | Automotive Body Control Module |
|
Use Scenario: Enabling secure over-the-air (OTA) firmware patches for utility smart meters operating on lithium-thionyl chloride batteries. IC Role / Device Role / Timing Role: Low-power, sector-erasable memory supporting atomic firmware swap with minimal active time. Use Value: 200 nA ultra-deep power-down current extends 15-year battery life while retaining valid firmware image during sleep. |
Use Scenario: Storing vehicle-specific configuration parameters and diagnostic event logs in body control units (BCUs). IC Role / Device Role / Timing Role: Dual-I/O capable Flash providing rapid parameter readout during CAN bus diagnostics sessions. Use Value: 104 MHz Dual-Output Read achieves sub-100 µs response time for ECU configuration queries under ISO 15765-2 timing constraints. |
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, 133 MHz max clock, Quad-I/O support (vs. Dual-I/O only), no OTP register | Better raw bandwidth for high-throughput boot; lacks hardware-secured unique ID for anti-cloning | Select if system requires quad-speed read or higher clock tolerance; avoid if OTP-based secure boot is mandatory |
| Micron MT25QL02G | 2 Mbit density, 133 MHz max clock, built-in SFDP support, deeper power-down (1 µA vs. 4.5 µA) | Enhanced configurability via SFDP; slightly higher standby current than AT25DF021A-SSHN-B's 25 µA typical | Prefer for designs needing standardized parameter discovery; verify WP/HOLD pin behavior matches legacy layout |
Compared with W25Q20EW and MT25QL02G, the AT25DF021A-SSHN-B offers superior ultra-low-power operation (200 nA), integrated OTP security with factory-unique ID, and proven industrial temperature reliability-but trades off quad-mode speed and SFDP flexibility.
Availability
AT25DF021A-SSHN-B is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code, smart meter OTA updates, and automotive body control module configuration requiring stable component supply across extended product lifecycles.
Supply support for AT25DF021A-SSHN-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
Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT applications.
The AT25DF021A-SSHN-B belongs to Renesas' serial Flash memory product line, designed specifically for cost-sensitive, power-constrained embedded systems requiring reliable code storage, secure device identity, and flexible in-field update capability.
FAQ
What is the operating voltage range of the AT25DF021A-SSHN-B?
The AT25DF021A-SSHN-B operates from 1.65 V to 3.6 V across the full industrial temperature range (–40°C to +85°C). This wide supply range allows direct interfacing with 1.8 V and 3.3 V microcontrollers without level-shifting circuitry, simplifying board design and reducing BOM count in mixed-voltage systems.
Does the AT25DF021A-SSHN-B support Dual-I/O read mode, and what benefit does it provide?
Yes, the AT25DF021A-SSHN-B supports Dual-I/O read mode using SI (I/O0) and SO (I/O1) pins, delivering two bits per SCK falling edge. This doubles effective read bandwidth versus standard SPI, enabling faster boot code loading and reduced firmware verification time-critical in real-time embedded applications where startup latency matters.
How is hardware write protection implemented on the AT25DF021A-SSHN-B?
Hardware write protection on the AT25DF021A-SSHN-B is controlled by the active-low WP pin. When asserted (pulled low), it locks protected sectors regardless of software state-preventing accidental or malicious writes/erases during power transients or firmware faults. The pin is internally pulled high, allowing safe default operation when left unconnected.
What is the purpose and structure of the OTP security register in the AT25DF021A-SSHN-B?
The AT25DF021A-SSHN-B includes a 128-byte OTP security register: 64 bytes are factory-programmed with a unique device identifier, and 64 bytes are user-programmable. This enables secure device serialization, electronic serial number (ESN) storage, and locked key provisioning-supporting bootloader authentication and anti-counterfeiting in regulated markets.
What erase block sizes does the AT25DF021A-SSHN-B support, and why does granularity matter?
The AT25DF021A-SSHN-B supports 256-Byte page erase, plus uniform 4-kB, 32-kB, and 64-kB block erase. Fine-grained page erase allows updating small configuration fields without disturbing adjacent code; larger blocks optimize bulk firmware upgrades. This flexibility minimizes wasted space and enables atomic OTA updates in constrained memory systems.
AT25DF021A-SSHN-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 104 MHz
- Write Cycle Time - Word, Page:
- 8µs, 2.5ms
- Access Time:
- -
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25DF021A-SSHN-B FAQ
1.How can I place an order for AT25DF021A-SSHN-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021A-SSHN-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 AT25DF021A-SSHN-B reliable?
The price and inventory of AT25DF021A-SSHN-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF021A-SSHN-B is usually 5 days.
3.What payment methods are accepted for AT25DF021A-SSHN-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021A-SSHN-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021A-SSHN-B?
AT25DF021A-SSHN-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021A-SSHN-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 AT25DF021A-SSHN-B?
For technical support, including AT25DF021A-SSHN-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021A-SSHN-B requirements.
6.How does Aetrix verify that AT25DF021A-SSHN-B is sourced from the original manufacturer or authorized distributors?
All AT25DF021A-SSHN-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 AT25DF021A-SSHN-B meets industry standards.
7.What is the process for return or replacement of AT25DF021A-SSHN-B?
All AT25DF021A-SSHN-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021A-SSHN-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 AT25DF021A-SSHN-B part is unused and in its original packaging.
Return procedure for AT25DF021A-SSHN-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25DF021A-SSHN-B Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
