AT25DQ161-SSH-B Microchip Integrated Circuit (Small Outline Packages) In Stock
The Microchip AT25DQ161-SSH-B is a 16 Mbit SPI serial NOR flash memory operating from 2.7 V to 3.6 V, with a maximum clock frequency of 100 MHz and 100,000 write/erase cycle endurance, packaged in an 8-pin SOIC. It delivers high-speed code storage and data logging capability for embedded microcontroller applications with long data retention of 20 years.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- NOT RECOMMENDED
- Datasheet
- AT25DQ161-SSH-B Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of AT25DQ161-SSH-B?
- 16 Mbit (2 Mbyte) NOR flash with 100 MHz SPI clock for fast firmware storage and data read throughput in embedded systems
- 100,000 write/erase cycle endurance with 20-year data retention ensuring long-term reliability in industrial and consumer applications
- 2.7 V to 3.6 V single-supply operation compatible with 3.3 V microcontroller SPI buses without level-shift circuitry
- Dual and Quad SPI output modes available for enhanced read throughput in bandwidth-demanding code execution or data streaming applications
What is AT25DQ161-SSH-B used for?
The AT25DQ161-SSH-B is used for firmware code storage and in-system firmware update (ISP) in microcontroller-based embedded systems such as IoT devices, industrial sensors, and consumer electronics where 16 Mbit of non-volatile memory covers typical firmware and data logging requirements. Its 100 MHz SPI interface and dual/quad I/O modes enable fast firmware boot times in systems using execute-in-place (XIP) or shadow-to-RAM architectures. The 8-pin SOIC package and 3.3 V operation make it a direct drop-in companion for ARM Cortex-M and PIC32 microcontroller SPI buses.
What are the specifications of AT25DQ161-SSH-B?
| YTEOL | 3 |
| Clock Frequency-Max (fCLK) | 100MHz |
| Data Retention Time-Min | 20 |
| Endurance | 100000 Write/Erase Cycles |
| JESD-30 Code | R-PDSO-G8 |
| Memory Density | 16777216bit |
| Memory IC Type | FLASH |
| Memory Width | 8 |
| Number of Functions | 1 |
| Number of Words | 2097152words |
| Number of Words Code | 2000000 |
| Operating Mode | SYNCHRONOUS |
| Organization | 2MX8 |
| Output Characteristics | 3-STATE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Parallel/Serial | SERIAL |
| Programming Voltage | 3V |
| Serial Bus Type | QSPI |
| Standby Current-Max | 0.00005A |
| Supply Current-Max | 0.019mA |
| Supply Voltage-Max (Vsup) | 3.6V |
| Supply Voltage-Min (Vsup) | 2.7V |
| Supply Voltage-Nom (Vsup) | 3V |
| Surface Mount | YES |
| Technology | CMOS |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Type | NOR TYPE |
| Write Protection | HARDWARE/SOFTWARE |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.32.00.51 |
Where can I find the AT25DQ161-SSH-B datasheet?
AT25DQ161-SSH-B Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for AT25DQ161-SSH-B?
Compatible alternatives and drop-in replacements for AT25DQ161-SSH-B:
Frequently Asked Questions
What storage capacity and SPI clock speed does the AT25DQ161-SSH-B provide for embedded firmware storage?
The AT25DQ161-SSH-B offers 16 Mbit (2 Mbyte) of NOR flash storage with a maximum SPI clock frequency of 100 MHz. In standard single-bit SPI mode, this supports a peak read throughput of approximately 12.5 MByte per second, sufficient to shadow 2 MByte of firmware into RAM in under 200 ms at full clock speed, or to directly execute code from flash via XIP at speeds practical for low-latency embedded control applications.
How does the AT25DQ161-SSH-B's 100,000 cycle endurance compare to typical flash usage in a firmware update scenario?
With 100,000 write/erase cycle endurance per sector, the AT25DQ161-SSH-B can sustain daily firmware updates for over 270 years, or hourly OTA updates for approximately 11 years, far exceeding the operational life of most IoT devices and industrial sensors. Combined with its 20-year data retention, this endurance makes the AT25DQ161-SSH-B suitable for long-field-life applications such as utility meters and building automation controllers that receive periodic firmware updates over their service life.
Which microcontroller families and voltage domains are directly compatible with the AT25DQ161-SSH-B SPI interface?
The AT25DQ161-SSH-B operates from 2.7 V to 3.6 V, making it directly compatible with 3.3 V SPI buses from microcontrollers such as STM32, ESP32, PIC32, and NXP i.MX RT series without requiring voltage-level translation. For 5 V microcontrollers or Arduino-class platforms, a simple level-shift buffer or resistor divider on MOSI and SCK lines brings the signals within the 3.6 V maximum input threshold, allowing interfacing without damaging the flash device.
How does selecting AT25DQ161-SSH-B in an 8-pin SOIC package affect PCB layout options compared to a WSON or BGA flash alternative?
The 8-pin SOIC package of the AT25DQ161-SSH-B has a body size of approximately 5.3 mm × 6.2 mm with 1.27 mm pin pitch, which is larger than WSON (8-pin, 5.0 mm × 6.0 mm with exposed pad) but offers hand-soldering and rework advantages critical in prototype and low-volume production. For space-constrained designs where board area must be minimized below 30 mm², a WSON or UDFN package alternative should be considered, while the SOIC suits designs prioritizing ease of PCB inspection, rework, and automated optical inspection.
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