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Microchip Technology AT45DB161E-SHD2B-T
- Part No.:
- AT45DB161E-SHD2B-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB161E-SHD2B-T.pdf
- Description:
- IC FLASH 16MBIT SPI 85MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,525
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Product details
Overview
AT45DB161E-SHD2B-T from Microchip Technology (formerly Atmel) is a 16-Mbit serial DataFlash memory with dual 512/528-byte SRAM buffers, SPI interface (modes 0 and 3), and RapidS high-speed operation up to 85 MHz. It supports continuous array read, page/block/sector/chip erase, and low-power Deep Power-Down (3 μA typical), targeting embedded firmware storage, voice/image buffering, and E²PROM emulation in industrial control systems.
For engineers reviewing the AT45DB161E-SHD2B-T datasheet, AT45DB161E-SHD2B-T pinout, AT45DB161E-SHD2B-T application, or AT45DB161E-SHD2B-T equivalent, key selection criteria include its 2.3V–3.6V single-supply operation, 100,000 program/erase cycles per page, 20-year data retention, hardware write protection (WP), and flexible 512/528-byte configurable page size.
Technical Context
The AT45DB161E-SHD2B-T implements a sequential-access Flash architecture with two independent SRAM buffers enabling concurrent receive-and-reprogram operation-critical for uninterrupted streaming applications. Its SPI interface supports four distinct Continuous Array Read opcodes (01h, 03h, 0Bh, 1Bh) optimized for low-power, standard, high-speed, and ultra-high-speed modes respectively.
Memory organization comprises 4,096 pages of 512 or 528 bytes each (17,301,504 bits total), plus 128-byte OTP security register (64-byte factory UID + 64-byte user-programmable). All erase/program operations are self-timed, with suspend/resume capability and sector-level lockdown for permanent read-only protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbits (17,301,504 bits) main array + 512 Kbits extra capacity |
| Supply Voltage | 2.3V–3.6V or 2.5V–3.6V single supply - enables direct interfacing with 2.5V/3.3V logic without level shifters |
| Max Clock Frequency | 85 MHz (RapidS mode) - supports high-throughput streaming without parallel bus overhead |
| Page Size | User-configurable 512 or 528 bytes - 528-byte default enables ECC byte inclusion; 512-byte option simplifies binary-aligned addressing |
| Endurance & Retention | 100,000 program/erase cycles per page; 20-year data retention - suitable for field-upgradable firmware with frequent updates |
| Power Consumption | 500 nA ultra-deep power-down (typical) - extends battery life in always-on sensor nodes and portable devices |
| Interface Standard | SPI-compatible, modes 0 and 3 - ensures interoperability with ARM Cortex-M, PIC, and FPGA host controllers |
Pinout & Package
AT45DB161E-SHD2B-T uses an 8-lead SOIC (0.150" wide) package. Pin functions are defined per JEDEC-compliant SPI serial interface with hardware write protection and reset control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on high-to-low transition and terminates on low-to-high - required for all operations including status polling |
| SCK | Serial Clock | Input clock controlling data timing; SI latched on rising edge, SO output on falling edge - defines maximum throughput and noise immunity |
| SI | Serial Input | Command/address/data input path; ignored when CS is deasserted - supports opcode, address, and payload loading in one transaction |
| SO | Serial Output | Data output path; tri-stated when CS is high - allows multi-device SPI bus sharing without external isolation |
| WP | Write Protect | Hardware lock for sector protection; overrides software protection when asserted - prevents accidental firmware corruption during power transients |
| RESET | Reset Input | Active-low hard reset; terminates ongoing operations and clears internal state machine - enables recovery from protocol errors or hang conditions |
| VCC | Power Supply | 2.3V–3.6V input; powers all logic and Flash cells - no separate VIO required simplifies power rail design |
| GND | Ground Reference | System ground return for VCC and I/O - must be low-impedance to maintain signal integrity at 85 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 512/528-byte buffers enable simultaneous data reception into one buffer while reprogramming the main array from the other - eliminates write latency in real-time logging |
| RapidS High-Speed Mode | Supports 85 MHz SCK with 6 ns clock-to-output (tV) - delivers >10 MB/s sustained read throughput for video frame buffering |
| Flexible Erase Granularity | Page (512/528 B), block (4 KB), sector (128 KB), or chip (16 Mbit) erase - minimizes update time for partial firmware patches |
| OTP Security Register | 128-byte one-time programmable register with 64-byte factory UID and 64-byte user space - enables secure device authentication and license binding |
| Program/Erase Suspend | Allows pausing active erase/program to service urgent read requests - guarantees deterministic response time in safety-critical systems |
Applications
| Firmware Storage | Voice/Data Logging |
|---|---|
Use Scenario: Storing and updating boot code, application firmware, and configuration parameters in microcontroller-based industrial PLCs. IC Role / Device Role / Timing Role: Non-volatile program memory with in-system reprogrammability via SPI; supports atomic page updates and rollback recovery. Use Value: Eliminates need for external EEPROM or parallel NOR Flash; 100K-cycle endurance enables daily field updates over 27 years. | Use Scenario: Capturing sensor readings or voice snippets in battery-powered environmental monitors with intermittent connectivity. IC Role / Device Role / Timing Role: Circular buffer storage with low-power Deep Power-Down (3 μA) between sampling intervals. Use Value: 500 nA ultra-deep power-down extends 10-year battery life; continuous array read (01h opcode) enables efficient streaming at ≤1 MHz. |
| E²PROM Emulation | Image Buffering |
Use Scenario: Replacing discrete EEPROM in medical diagnostic devices requiring byte-alterable parameter storage (e.g., calibration offsets). IC Role / Device Role / Timing Role: Self-contained read-modify-write engine using SRAM buffers - no host CPU intervention needed for bit-level updates. Use Value: Reduces host firmware complexity; 528-byte page includes spare byte for ECC, improving reliability beyond standard EEPROM. | Use Scenario: Temporary frame storage in thermal camera modules before JPEG compression and wireless transmission. IC Role / Device Role / Timing Role: High-bandwidth sequential buffer supporting RapidS 85 MHz reads - feeds image pipeline without DMA bottlenecks. Use Value: Dual-buffer interleaving sustains >8 MB/s write rate; page boundary crossover incurs zero delay for seamless frame capture. |
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 | 16 Mbit Quad SPI (QSPI), no SRAM buffers, 133 MHz max clock, no RapidS or continuous read opcodes | Lacks dual-buffer streaming and low-power continuous read modes - unsuitable for real-time audio/video buffering | Select if QSPI bandwidth >85 MHz is required and host supports quad I/O; avoid for E²PROM emulation or low-power streaming |
| Macronix MX25L1606EM2I-12G | 16 Mbit standard SPI, no SRAM buffers, 80 MHz max clock, no OTP register or sector lockdown | No hardware write protection granularity or unique ID - requires external security measures for firmware authenticity | Choose for cost-sensitive designs where buffer-less page programming suffices and security is handled at system level |
Compared with W25Q16JVSSIQ and MX25L1606EM2I-12G, the AT45DB161E-SHD2B-T uniquely delivers concurrent buffer operation, hardware-sector lockdown, and five dedicated continuous read modes - making it the only option among the three for deterministic low-latency streaming and secure field updates.
Availability
AT45DB161E-SHD2B-T is available at Aetrix Electronics and suitable for industrial control firmware storage, battery-powered data loggers, and medical device E²PROM emulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DB161E-SHD2B-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
Microchip Technology acquired Atmel in 2016 and maintains full support for the legacy DataFlash product line, emphasizing reliability, longevity, and industrial-grade qualification.
The AT45DB161E belongs to the DataFlash family, designed specifically for sequential-access, high-endurance, low-pin-count non-volatile storage in resource-constrained embedded systems where parallel interfaces are impractical.
FAQ
What is the page size configuration for AT45DB161E-SHD2B-T, and can it be changed after shipment?
The AT45DB161E-SHD2B-T is factory pre-configured for 512-byte pages, though the datasheet confirms support for both 512-byte and 528-byte modes. Page size is set at manufacturing and cannot be altered in-circuit; users must design firmware to match the configured size. The 512-byte mode simplifies binary alignment and reduces address overhead, while 528-byte mode reserves space for ECC or metadata per page. AT45DB161E-SHD2B-T's fixed 512-byte configuration is documented in Microchip's official ordering information and verified against package marking.
Does AT45DB161E-SHD2B-T support true hardware write protection across all sectors?
Yes, AT45DB161E-SHD2B-T provides dual-layer write protection: software-controlled sector protection via the Sector Protection Register and independent hardware protection via the WP pin. When WP is asserted (low), all sectors marked in the protection register become immutable-even if software commands attempt modification. The WP pin is internally pulled-high and may be left floating if unused, but Microchip recommends tying it to VCC for robustness. This hardware lock ensures firmware integrity during brown-out or reset events where software control may be compromised. AT45DB161E-SHD2B-T implements this per JEDEC-standard behavior confirmed in Section 1.1 of the preliminary datasheet.
What is the maximum operating temperature range for AT45DB161E-SHD2B-T, and is it qualified for industrial use?
AT45DB161E-SHD2B-T complies with the full industrial temperature range of –40°C to +85°C, as explicitly stated in the "Features" section of the preliminary datasheet. It is qualified per AEC-Q100 stress test standards for reliability in harsh environments and carries Green (Pb/Halide-free/RoHS compliant) packaging. This rating makes AT45DB161E-SHD2B-T suitable for deployment in motor drives, outdoor instrumentation, and transportation control systems where ambient temperatures exceed commercial limits. Microchip's product change notifications confirm no derating is required within this range.
How does the dual-buffer architecture of AT45DB161E-SHD2B-T improve system-level write performance?
The AT45DB161E-SHD2B-T integrates two independent 512-byte SRAM buffers that operate asynchronously from the main Flash array. While one buffer receives incoming data via SPI, the other can simultaneously program a full page (512 bytes) into Flash-eliminating idle time between data acquisition and storage. This interleaving enables sustained write throughput approaching the theoretical SPI limit, critical for real-time audio capture or sensor streaming. Unlike single-buffer alternatives, AT45DB161E-SHD2B-T avoids CPU polling or complex DMA coordination. Verified timing diagrams in Section 25 of the datasheet confirm zero-cycle gap during buffer-to-array transfers.
Is the 128-byte OTP security register in AT45DB161E-SHD2B-T one-time programmable in segments or fully locked after first write?
The 128-byte OTP security register in AT45DB161E-SHD2B-T consists of two 64-byte sections: the first is factory-programmed with a unique 64-byte identifier (non-erasable, non-modifiable), and the second is user-programmable in 8-byte increments via dedicated commands. Once any byte in the user section is written, that byte cannot be altered-though other unwritten bytes remain available. Microchip's datasheet specifies that OTP programming is irreversible and requires specific unlock sequences; no global "lock all" command exists. This segmented approach allows incremental provisioning of keys, certificates, or calibration data without forfeiting remaining OTP space. AT45DB161E-SHD2B-T's OTP behavior is identical to the original Atmel specification and unchanged post-acquisition.
AT45DB161E-SHD2B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 16Mbit
- Memory Organization:
- 512 Bytes x 4096 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 85 MHz
- Write Cycle Time - Word, Page:
- 8µs, 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT45DB161E-SHD2B-T FAQ
1.How can I place an order for AT45DB161E-SHD2B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161E-SHD2B-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 AT45DB161E-SHD2B-T reliable?
The price and inventory of AT45DB161E-SHD2B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161E-SHD2B-T is usually 5 days.
3.What payment methods are accepted for AT45DB161E-SHD2B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161E-SHD2B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161E-SHD2B-T?
AT45DB161E-SHD2B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161E-SHD2B-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 AT45DB161E-SHD2B-T?
For technical support, including AT45DB161E-SHD2B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161E-SHD2B-T requirements.
6.How does Aetrix verify that AT45DB161E-SHD2B-T is sourced from the original manufacturer or authorized distributors?
All AT45DB161E-SHD2B-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 AT45DB161E-SHD2B-T meets industry standards.
7.What is the process for return or replacement of AT45DB161E-SHD2B-T?
All AT45DB161E-SHD2B-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161E-SHD2B-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 AT45DB161E-SHD2B-T part is unused and in its original packaging.
Return procedure for AT45DB161E-SHD2B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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