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Microchip Technology AT25DQ161-SSH-B
- Part No.:
- AT25DQ161-SSH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DQ161-SSH-B.pdf
- Description:
- IC FLASH 16MBIT SPI 100MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,944
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Product details
Overview
AT25DQ161-SSH-B from Microchip Technology (formerly Atmel) is a 16-Mbit serial flash memory IC designed for code shadowing and data storage in embedded systems. It operates from 2.7V to 3.6V, supports SPI Modes 0/3, delivers up to 100MHz RapidS read performance, features 4KB/32KB/64KB uniform block erase, and includes hardware write protection via WP pin.
For engineers reviewing the AT25DQ161-SSH-B datasheet, AT25DQ161-SSH-B pinout, AT25DQ161-SSH-B application, or AT25DQ161-SSH-B equivalent, key selection considerations include dual/quad I/O support for bandwidth-critical boot memory, sector lockdown for firmware integrity, OTP security register for device serialization, and industrial temperature operation (-40°C to +85°C).
Technical Context
The AT25DQ161-SSH-B implements a flexible SPI flash architecture with four erase granularities (4KB/32KB/64KB blocks + full chip), enabling efficient co-location of firmware code and runtime data without wasted space. Its 32 × 64KB physical sectors support independent protection and permanent lockdown per sector.
It uses dual- and quad-I/O protocols (via SI/SO/WP/HOLD pins under QE-bit enable) to achieve 100MHz RapidS read throughput and 5ns clock-to-output timing. The device integrates dedicated control logic for program/erase suspend/resume, automatic failure reporting, and deep power-down mode drawing only 5μA typical current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2 MB) - sufficient for medium-complexity firmware images and configuration data storage |
| Supply Voltage | 2.7V–3.6V - compatible with standard 3V logic systems without level-shifting |
| Max Read Frequency | 100 MHz (RapidS) - enables fast boot loading and real-time code execution from flash |
| Erase Granularity | 4KB / 32KB / 64KB blocks + full chip - minimizes erase overhead during field updates |
| Write Endurance | 100,000 program/erase cycles - supports frequent firmware patching in industrial gateways |
| Data Retention | 20 years - ensures long-term reliability in unattended equipment |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive under-hood applications |
| Power Consumption | 5 μA deep power-down - extends battery life in always-on IoT sensor nodes |
Pinout & Package
AT25DQ161-SSH-B is packaged in an 8-lead SOIC (0.208" wide), pin-compatible with industry-standard serial flash footprints. Pin functions support standard SPI, dual-I/O, and quad-I/O modes depending on Configuration Register settings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates all commands and places SO in high-Z when deasserted |
| SCK | Serial Clock | Input clock controlling data latching (rising edge) and output timing (falling edge) |
| SI (I/O0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; becomes I/O0 in dual/quad modes when QE=1 |
| SO (I/O1) | Serial Output / Quad I/O Lane 1 | Standard read data output; becomes I/O1 in dual/quad modes when QE=1 |
| WP (I/O2) | Write Protect / Quad I/O Lane 2 | Hardware sector lock control; repurposed as I/O2 in quad mode when QE=1 |
| HOLD (I/O3) | Communication Hold / Quad I/O Lane 3 | Pauses ongoing transfers without deselecting; repurposed as I/O3 in quad mode when QE=1 |
| VCC | Power Supply | 2.7V–3.6V supply input; powers internal logic and charge pumps for programming |
| GND | Ground Reference | System ground return path for all internal circuitry and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad-I/O Read & Program | Enables 2× or 4× data throughput vs standard SPI-critical for reducing boot time in resource-constrained MCUs |
| Uniform 4KB Block Erase | Allows fine-grained firmware updates without erasing unrelated code modules or configuration data |
| Sector Lockdown | Makes any combination of 64KB sectors permanently read-only-prevents tampering with bootloader or crypto keys |
| 128-byte OTP Security Register | Stores immutable device-specific identifiers, ESNs, or encrypted keys-enables secure provisioning and anti-cloning |
| Program/Erase Suspend | Permits interrupting long erase cycles to service time-critical host requests-improves system responsiveness |
| Global Protect/Unprotect | Reduces manufacturing test overhead by enabling bulk sector unlock before initial programming |
Applications
| Secure Bootloader Storage | Firmware Over-the-Air (FOTA) Update Partition |
|---|---|
Use Scenario: Storing immutable bootloader code in a tamper-resistant region of flash memory. IC Role / Device Role / Timing Role: Non-volatile code storage with permanent sector lockdown and hardware write protection. Use Value: Prevents unauthorized modification of boot sequence using AT25DQ161-SSH-B's sector lockdown and WP pin control. | Use Scenario: Holding staged firmware images during wireless update processes in edge gateways. IC Role / Device Role / Timing Role: High-reliability data partition supporting atomic erase/program with suspend/resume capability. Use Value: Enables safe background firmware staging using AT25DQ161-SSH-B's 4KB block erase and program suspend features. |
| Industrial HMI Configuration Data | Medical Device Calibration Storage |
Use Scenario: Persisting user interface layouts, language packs, and operational parameters in factory HMIs. IC Role / Device Role / Timing Role: Dual-purpose code+data flash with independent sector protection for mixed-content storage. Use Value: Eliminates need for separate EEPROM by leveraging AT25DQ161-SSH-B's uniform 4KB erase and individual sector protect. | Use Scenario: Storing factory-calibrated sensor offsets and medical safety thresholds requiring long-term integrity. IC Role / Device Role / Timing Role: Secure, high-retention non-volatile memory with OTP register for cryptographic binding. Use Value: Ensures calibration persistence over 20 years and ties device identity to stored values via AT25DQ161-SSH-B's 128-byte OTP register. |
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 W25Q16JVSSIQ | Same density (16Mbit), 3V supply, quad-I/O, but lacks RapidS protocol and sector lockdown | No permanent read-only sector capability; relies on software-based protection schemes | Preferred where cost sensitivity outweighs need for hardware-enforced lockdown |
| Macronix MX25L1606EM2I-12G | Identical pinout and SPI command set; supports 104MHz max frequency but no RapidS acceleration | Higher max clock but no 5ns tV spec; requires tighter timing margins in high-speed designs | Selected when legacy design compatibility is prioritized over fastest possible boot latency |
Compared with AT25DQ161-SSH-B, W25Q16JVSSIQ offers lower cost but omits sector lockdown and RapidS acceleration, while MX25L1606EM2I-12G matches pinout and timing robustness but trades off the 5ns tV advantage critical for ultra-fast boot sequences.
Availability
AT25DQ161-SSH-B is available at Aetrix Electronics and suitable for industrial HMIs, medical diagnostics equipment, and automotive telematics modules requiring stable component supply across extended product lifecycles.
Supply support for AT25DQ161-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
Microchip Technology acquired Atmel in 2016 and maintains full support for the AT25DQ family of serial flash memories.
The AT25DQ product line was engineered specifically for embedded systems needing reliable, low-power, high-speed code and data storage with advanced security features like sector lockdown and OTP registers.
FAQ
What is the maximum clock frequency supported by AT25DQ161-SSH-B in RapidS mode?
The AT25DQ161-SSH-B supports up to 100MHz in RapidS read mode, delivering significantly higher throughput than standard SPI. This mode requires use of the 0x1B opcode and two dummy bytes after the address. The 5ns clock-to-output timing (tV) ensures minimal latency during high-speed reads, making AT25DQ161-SSH-B well-suited for applications demanding rapid boot or real-time code execution from flash.
Does AT25DQ161-SSH-B support true quad-I/O operation, and what configuration is required?
Yes, AT25DQ161-SSH-B supports true quad-I/O for both read and program operations using SI, SO, WP, and HOLD as I/O[3:0]. To enable this mode, the QE (Quad Enable) bit in the Configuration Register must be set to 1. Once enabled, opcodes 0x6B (Quad-Output Read) and 0x32 (Quad-Input Program) activate simultaneous 4-bit transfers, doubling bandwidth versus dual-I/O and quadrupling it versus standard SPI-key for optimizing AT25DQ161-SSH-B in bandwidth-constrained designs.
How does the sector lockdown feature work in AT25DQ161-SSH-B, and is it reversible?
The sector lockdown feature in AT25DQ161-SSH-B allows any combination of its 32 × 64KB sectors to be made permanently read-only via the 0x33 (Sector Lockdown) command. Once locked, a sector cannot be erased or programmed-even with WP pin disabled or global unprotect active. Lockdown is irreversible and survives power cycles, providing hardware-enforced immutability. This makes AT25DQ161-SSH-B ideal for storing bootloaders or cryptographic keys where tamper resistance is mandatory.
What erase block sizes are available in AT25DQ161-SSH-B, and why does granularity matter?
AT25DQ161-SSH-B supports four erase granularities: 4KB, 32KB, 64KB blocks, and full chip erase. Fine 4KB blocks minimize wasted space during partial firmware updates-unlike larger-block devices that force erasing entire sections containing unchanged code. This efficiency directly increases usable capacity and reduces update time. For example, updating a single driver module in AT25DQ161-SSH-B requires erasing only one 4KB block instead of a 64KB block, preserving adjacent data and improving field upgrade reliability.
Is AT25DQ161-SSH-B still recommended for new designs, and what is the official migration path?
No-Microchip explicitly marks AT25DQ161-SSH-B as "Not Recommended for New Designs" in its datasheet, recommending migration to AT25DQ321 (32Mbit version) for future projects. The AT25DQ321 maintains identical pinout, command set, and feature set-including RapidS, sector lockdown, and OTP register-but doubles memory capacity and improves endurance. Designers should evaluate AT25DQ321 for new schematics while continuing to support AT25DQ161-SSH-B for legacy production and repair.
AT25DQ161-SSH-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- 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:
- 16Mbit
- Memory Organization:
- 2M x 8
- 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
AT25DQ161-SSH-B FAQ
1.How can I place an order for AT25DQ161-SSH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DQ161-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 AT25DQ161-SSH-B reliable?
The price and inventory of AT25DQ161-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 AT25DQ161-SSH-B is usually 5 days.
3.What payment methods are accepted for AT25DQ161-SSH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DQ161-SSH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DQ161-SSH-B?
AT25DQ161-SSH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DQ161-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 AT25DQ161-SSH-B?
For technical support, including AT25DQ161-SSH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DQ161-SSH-B requirements.
6.How does Aetrix verify that AT25DQ161-SSH-B is sourced from the original manufacturer or authorized distributors?
All AT25DQ161-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 AT25DQ161-SSH-B meets industry standards.
7.What is the process for return or replacement of AT25DQ161-SSH-B?
All AT25DQ161-SSH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25DQ161-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 AT25DQ161-SSH-B part is unused and in its original packaging.
Return procedure for AT25DQ161-SSH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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