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Renesas AT25DF081A-SSH-B
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- Part No.:
- AT25DF081A-SSH-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DF081A-SSH-B.pdf
- Description:
- IC FLASH 8MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,496
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Product details
Overview
AT25DF081A-SSH-B from Adesto Technologies is an 8-Mbit SPI serial Flash memory IC designed for code shadowing and data storage in embedded systems. It operates from a single 2.7V–3.6V supply, supports SPI Modes 0/3 and RapidS™ up to 100MHz, delivers ≤5ns clock-to-output delay, and features uniform 4/32/64-Kbyte block erase plus full-chip erase.
For engineers reviewing the AT25DF081A-SSH-B datasheet, AT25DF081A-SSH-B pinout, AT25DF081A-SSH-B application, or AT25DF081A-SSH-B equivalent, this page details verified timing, sector protection, dual-input/dual-output operation, OTP security register, and industrial-temperature reliability - all critical for firmware update, secure boot, and mixed code/data storage designs.
Technical Context
The AT25DF081A-SSH-B implements a flexible erase architecture with 16 × 64-Kbyte sectors, enabling granular code patching and isolated data logging without cross-contamination. Its dual-input program (A2h) and dual-output read (3Bh) modes double effective throughput versus standard SPI by transferring two bits per SCK edge.
Hardware write protection via the WP pin and sector lockdown (33h/34h) provide tamper-resistant firmware partitioning, while the 128-byte OTP register supports device serialization and key storage. The device uses internal address counters for sequential reads and auto-resets the Write Enable Latch (WEL) on abort conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 8 Mbit (1,048,576 bytes), sufficient for medium-complexity firmware images and configuration logs |
| Supply voltage | 2.7V–3.6V - compatible with 3.3V logic domains without level shifting |
| Max read frequency | 100 MHz (RapidS™ mode) - enables <10 ns effective access time for real-time code execution |
| Erase granularity | 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 |
| Operating temperature | −40°C to +85°C - meets full industrial grade requirements without derating |
| Power consumption | 5 µA deep power-down current - enables ultra-low-power sleep states in battery-backed systems |
Pinout & Package
AT25DF081A-SSH-B is packaged in an 8-lead SOIC (208-mil wide), pin-compatible with JEDEC MS-012AC. All pins support 3.3V-tolerant I/O with internal pull-ups on WP and HOLD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; rising edge terminates operations and places SO in high-Z state |
| SCK | Serial Clock | Controls data latching (rising edge) and output timing (falling edge); supports up to 100 MHz |
| SI (SIO) | Serial Input / Dual-Output | Input for commands/addresses/data; becomes output (SIO) during Dual-Output Read (3Bh) |
| SO (SOI) | Serial Output / Dual-Input | Output for read data; becomes input (SOI) during Dual-Input Program (A2h) |
| WP | Write Protect | Hardware lock for protected sectors; low-active; internally pulled high |
| HOLD | Communication Pause | Halts SPI transfer without deselecting; requires CS asserted and SCK low to activate |
| VCC | Power Supply | 2.7V–3.6V main supply; powers core, I/O, and charge pump for programming/erasing |
| GND | Ground Reference | System ground return; must be low-impedance for stable erase/write margins |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read (3Bh) | Delivers 2-bit-per-clock read throughput at up to 85 MHz, cutting read latency by ~50% vs. standard SPI |
| Sector Lockdown (33h) | Makes any combination of 64-Kbyte sectors permanently read-only - prevents runtime or field firmware corruption |
| 128-byte OTP Security Register | Stores immutable device identifiers, ESNs, or cryptographic keys; programmed once and verified post-write |
| Flexible Erase Architecture | Four erase granularities (4/32/64-Kbyte + chip) eliminate need for external EEPROM in mixed code/data applications |
| Global Protect/Unprotect | Enables one-command array-wide protection or unprotection - reduces manufacturing test overhead |
Applications
| Secure Firmware Storage | Industrial Data Logging |
|---|---|
Use Scenario: Storing bootloader, application firmware, and secure keys in a tamper-resistant manner across power cycles. IC Role / Device Role / Timing Role: Non-volatile code storage with hardware-enforced read-only lockdown for critical partitions. Use Value: Prevents unauthorized modification of boot code using sector lockdown and OTP register, meeting IEC 62443-3-3 SL2 requirements. | Use Scenario: Recording sensor readings, error logs, and calibration data in factory automation controllers. IC Role / Device Role / Timing Role: High-endurance data buffer with 4-Kbyte erase blocks aligned to log segment boundaries. Use Value: Enables 100K+ write cycles per sector and 20-year retention - eliminates wear leveling firmware overhead. |
| Consumer Device Configuration | Medical Diagnostic Instrumentation |
Use Scenario: Holding user preferences, display settings, and calibration offsets in smart home hubs and audio devices. IC Role / Device Role / Timing Role: Low-power, byte-addressable non-volatile storage accessed via SPI during system initialization. Use Value: 5 µA deep power-down current extends battery life; individual sector protection isolates user data from firmware updates. | Use Scenario: Storing FDA-required audit trails, device calibration history, and diagnostic firmware patches in portable ultrasound units. IC Role / Device Role / Timing Role: Industrial-grade Flash with traceable write cycles and guaranteed retention under thermal stress. Use Value: Meets 20-year data retention and −40°C to +85°C operation - satisfies IEC 62304 Class C software lifecycle requirements. |
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 W25Q80DVSSIG | 8-Mbit SPI Flash with Quad I/O support; lacks RapidS™ and dual-input program; 3.3V only; no OTP register | Supports QPI mode for higher bandwidth but requires additional I/O lines; no hardware sector lockdown | Select when quad interface is needed and OTP/key storage is handled externally |
| Macronix MX25L8006EM1I-12G | 8-Mbit SPI Flash with 104 MHz max clock; includes software reset and enhanced protection registers; no dual-input/dual-output mode | Offers faster standard read speed but no 2-bit-per-cycle acceleration; same 4/32/64-Kbyte erase flexibility | Choose for marginally higher base SPI throughput where dual-mode optimization is unnecessary |
Compared with W25Q80DVSSIG and MX25L8006EM1I-12G, the AT25DF081A-SSH-B uniquely combines RapidS™-accelerated reads, dual-input programming, and permanent sector lockdown - making it optimal for secure, latency-sensitive embedded firmware with minimal I/O count.
Availability
AT25DF081A-SSH-B is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and consumer IoT gateways requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25DF081A-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 (acquired by Dialog Semiconductor, now part of Renesas) specialized in low-power, high-reliability non-volatile memory and analog interface solutions for industrial and IoT applications.
The AT25DF081A-SSH-B belongs to Adesto's DataFlash® family, engineered specifically for embedded systems needing efficient code shadowing, secure firmware updates, and robust data logging in resource-constrained environments.
FAQ
What is the maximum clock frequency supported by AT25DF081A-SSH-B in RapidS™ mode?
The AT25DF081A-SSH-B supports up to 100 MHz in RapidS™ mode (opcode 1Bh), delivering sub-10 ns effective read access time. This exceeds standard SPI Mode 3 (85 MHz) and legacy read (50 MHz) performance, enabling faster code execution from Flash in microcontroller-based systems. The device maintains signal integrity at this rate due to optimized output drivers and ≤5 ns tV specification.
Does AT25DF081A-SSH-B support hardware write protection independent of software commands?
Yes, AT25DF081A-SSH-B provides hardware-controlled write protection via the dedicated WP pin. When WP is driven low, all protected sectors (configured via software Protect Sector command) become immune to program/erase operations - even if the Write Enable Latch is set. This complements software protection and prevents accidental or malicious writes during power-up transients or firmware faults.
How does the sector lockdown feature work in AT25DF081A-SSH-B?
The AT25DF081A-SSH-B sector lockdown (command 33h) permanently disables program/erase for selected 64-Kbyte sectors. Once locked, sectors cannot be unlocked - ensuring irreversible protection of boot code or cryptographic keys. Lockdown state is stored in non-volatile fuses and survives power cycles, making it suitable for security-critical applications like secure boot and regulatory compliance.
Can AT25DF081A-SSH-B be used in dual-input programming mode, and what is the benefit?
Yes, AT25DF081A-SSH-B supports dual-input programming (opcode A2h), using both SI and SO pins as inputs to clock two bits per SCK edge. This halves programming time for 256-byte pages compared to standard single-input mode (02h), improving firmware update efficiency in field-deployed devices where programming time directly impacts maintenance downtime.
What package options are available for AT25DF081A-SSH-B, and which one does the -SSH-B suffix indicate?
The -SSH-B suffix denotes the 8-lead SOIC package with 208-mil body width (JEDEC MS-012AC). This variant is pin-compatible with industry-standard 8-SOIC footprints and offers proven manufacturability in wave-solder and reflow processes. A second option, the 8-pad Ultra Thin DFN (5 × 6 × 0.6 mm), carries the -MHN-B suffix and targets space-constrained portable designs.
AT25DF081A-SSH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 8Mbit
- Memory Organization:
- 256 Bytes x 4096 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 100 MHz
- Write Cycle Time - Word, Page:
- 7µs, 3ms
- 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
AT25DF081A-SSH-B FAQ
1.How can I place an order for AT25DF081A-SSH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF081A-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 AT25DF081A-SSH-B reliable?
The price and inventory of AT25DF081A-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 AT25DF081A-SSH-B is usually 5 days.
3.What payment methods are accepted for AT25DF081A-SSH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF081A-SSH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF081A-SSH-B?
AT25DF081A-SSH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF081A-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 AT25DF081A-SSH-B?
For technical support, including AT25DF081A-SSH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF081A-SSH-B requirements.
6.How does Aetrix verify that AT25DF081A-SSH-B is sourced from the original manufacturer or authorized distributors?
All AT25DF081A-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 AT25DF081A-SSH-B meets industry standards.
7.What is the process for return or replacement of AT25DF081A-SSH-B?
All AT25DF081A-SSH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF081A-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 AT25DF081A-SSH-B part is unused and in its original packaging.
Return procedure for AT25DF081A-SSH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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