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Microchip Technology AT45DB161B-RC
- Part No.:
- AT45DB161B-RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT45DB161B-RC.pdf
- Description:
- IC FLASH 16MBIT SPI 20MHZ 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,173
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Product details
Overview
AT45DB161B-RC from Microchip Technology (formerly Atmel) is a 16-Mbit serial DataFlash memory IC with SPI interface, organized as 4096 pages × 528 bytes, featuring dual 528-byte SRAM buffers and hardware write protection. It operates from a single 2.5V–3.6V or 2.7V–3.6V supply, supports up to 20 MHz clock frequency, and enables continuous array read for code shadowing in embedded microcontroller systems.
For engineers reviewing the AT45DB161B-RC datasheet, AT45DB161B-RC pinout, AT45DB161B-RC application, or AT45DB161B-RC equivalent, key selection considerations include its page-erase flexibility, buffer-assisted streaming write capability, 5.0V-tolerant control pins, industrial temperature range (–40°C to +85°C), and compatibility with SPI Mode 0/3 for host MCU integration.
Technical Context
The AT45DB161B-RC implements a three-level memory architecture (sector/block/page) with 528-byte pages and 4224-byte blocks, enabling granular erase operations without full-array erasure. Its dual SRAM buffers support concurrent data reception and nonvolatile programming-critical for real-time firmware updates and audio streaming.
It uses a standard SPI serial interface with no address bus, eliminating parallel layout complexity. All program/erase operations are self-timed and require no external high-voltage programming signals; the RDY/BUSY pin and status register bit 7 provide deterministic busy-state monitoring for deterministic host timing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (17,301,504 bits), organized as 4096 × 528-byte pages - enables compact storage of boot code, configuration data, or voice samples. |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply - simplifies power design and eliminates level shifters in 3.3V systems. |
| Max Clock Frequency | 20 MHz - supports high-throughput sequential reads (e.g., code shadowing) with minimal CPU overhead. |
| SRAM Buffers | Two independent 528-byte buffers - allow pipelined writes: fill one buffer while programming the other into Flash, reducing effective write latency. |
| Write Protection | Hardware WP pin protects first 256 pages - ensures bootloader or calibration data remains immutable during field updates. |
| Input Tolerance | 5.0V-tolerant SI, SCK, CS, RESET, WP - permits direct interfacing with 5V logic without external level translation. |
| Operating Temperature | –40°C to +85°C industrial range - validated for use in automotive body control modules and industrial HMI displays. |
Pinout & Package
AT45DB161B-RC is packaged in a 28-pin TSOP-I (Type 1) with 0.55 mm pitch, pin-compatible with industry-standard SOIC-28 and CBGA variants. Pin functions are electrically identical across packages; mechanical footprint differs per variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: initiates command sequence on falling edge; must remain low during full instruction transfer (opcode + address + data). |
| SCK | Serial Clock | Input-only clock: data latched on rising edge (SI), output shifted on falling edge (SO); supports SPI Mode 0 and Mode 3. |
| SI | Serial Input | Command, address, and data input path - accepts all opcodes (e.g., 83H for buffer-to-page program) and 24-bit addressing sequences. |
| SO | Serial Output | Output-only data path - returns read data, status register bits (RDY/BUSY, COMP), or buffer contents; tri-stated when CS is high. |
| WP | Write Protect | Hardware lock: low state disables programming/erasing of pages 0–255 - prevents accidental corruption of critical firmware sections. |
| RESET | Chip Reset | Asynchronous reset: low pulse aborts ongoing operation and returns internal state machine to idle - used for error recovery. |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output: pulled low during self-timed operations (tEP, tPE, tBE) - allows polling or interrupt-driven host synchronization. |
| VCC / GND | Power Supply | Single 2.5–3.6V supply with dedicated ground - decoupling capacitor required near VCC pin to maintain 4 mA active read current stability. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous Array Read | Enables seamless code shadowing: after initial 24-bit address + 32 don't-care bits, data streams continuously across page boundaries with zero latency at wraparound. |
| Page Program with Built-in Erase | Single-command (e.g., 83H) page rewrite: internally erases target page to 0xFF then programs buffer contents - eliminates separate erase step in firmware. |
| Buffer-to-Page Compare | Status register bit 6 reports match/mismatch after 528-byte page-vs-buffer comparison - enables verified firmware patching without full readback. |
| Auto Page Rewrite | Atomic rewrite (58H/59H): transfers page to buffer, modifies bytes, then rewrites - solves random byte update limitation of standard Flash. |
| Industrial Temp Support | Guaranteed operation from –40°C to +85°C with 2 µA standby current - suitable for unheated outdoor electronics and factory-floor controllers. |
Applications
| Firmware Storage | Audio Data Buffering |
|---|---|
Use Scenario: Storing boot loader, application firmware, and configuration parameters in an ARM Cortex-M4-based motor controller. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast sequential read; RDY/BUSY pin synchronizes firmware load before CPU execution begins. Use Value: Continuous Array Read eliminates address management overhead, enabling direct shadowing into SRAM at 20 MHz - reduces boot time by 35% vs. parallel Flash. |
Use Scenario: Recording and playback of voice prompts in a smart HVAC thermostat with limited PCB area. IC Role / Device Role / Timing Role: Dual-buffer streaming storage: SI receives PCM data into Buffer 1 while Buffer 2 contents are programmed into Flash pages. Use Value: Overlapping I/O and programming cuts effective write latency by >50%, supporting real-time 8-kHz mono audio capture without dropouts. |
| Secure Configuration Storage | Industrial Sensor Calibration Data |
Use Scenario: Holding encrypted device keys and network credentials in a IIoT gateway requiring tamper resistance. IC Role / Device Role / Timing Role: Hardware write protection (WP pin) locks first 256 pages containing cryptographic keys against overwrite during OTA updates. Use Value: Prevents remote firmware update routines from accidentally corrupting security assets - meets IEC 62443-3-3 requirement for secure credential isolation. |
Use Scenario: Storing factory-calibrated offset/gain coefficients for 16-channel analog sensor inputs in a PLC module. IC Role / Device Role / Timing Role: Page-erasable nonvolatile storage: individual 528-byte pages hold coefficients for each sensor channel, updated only during calibration. Use Value: Enables field recalibration without erasing unrelated channels - extends EEPROM lifetime by avoiding block-level wear leveling overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q16JVSSIQ | 16 Mbit Quad SPI NOR Flash; requires 4-wire interface (IO0–IO3), no internal buffers; 104 MHz max read speed but no continuous array mode. | Better raw read bandwidth for cached code; lacks dual-buffer streaming and hardware page protection. | Choose for high-speed instruction fetch where buffering and write protection are unnecessary. |
| AT45DB161D-RC | Successor revision with enhanced reliability: improved data retention (20 years @ 85°C), lower tEP (5 ms vs. 8 ms), and extended endurance (100K cycles vs. 10K). | Same pinout and command set; backward compatible but not drop-in due to minor timing spec changes in status polling. | Prefer for new designs requiring longer data retention or higher endurance; legacy AT45DB161B-RC remains valid for cost-sensitive volume production. |
Compared with W25Q16JVSSIQ, AT45DB161B-RC delivers deterministic streaming writes and hardware-protected pages at the cost of lower peak bandwidth; versus AT45DB161D-RC, it trades reduced endurance and retention for proven field reliability in established platforms.
Availability
AT45DB161B-RC is available at Aetrix Electronics and suitable for industrial HMI displays, automotive body control modules, and IIoT sensor gateways requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.
Supply support for AT45DB161B-RC 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 DataFlash product family, including legacy parts like AT45DB161B-RC. The company specializes in microcontrollers, memory, and analog solutions for embedded systems.
The AT45DB161B-RC belongs to Microchip's Serial DataFlash line, designed specifically for applications needing efficient SPI-based nonvolatile storage with streaming I/O capability - targeting resource-constrained MCUs where parallel Flash is impractical.
FAQ
What is the maximum clock frequency supported by the AT45DB161B-RC?
The AT45DB161B-RC supports a maximum serial clock (SCK) frequency of 20 MHz for all read, write, and command operations. This rating applies across the full industrial temperature range (–40°C to +85°C) and 2.5V–3.6V supply voltage. Exceeding 20 MHz may result in timing violations during status register polling or data transfer, especially under worst-case process/voltage/temperature conditions.
Does the AT45DB161B-RC require a high-voltage programming signal?
No, the AT45DB161B-RC does not require any high-voltage programming signal. All program and erase operations are performed using only the standard 2.5V–3.6V supply voltage. The device integrates charge pumps internally, enabling single-supply in-system reprogrammability - a key advantage over traditional parallel NOR Flash devices.
How does the dual-buffer architecture of the AT45DB161B-RC improve system throughput?
The AT45DB161B-RC's two independent 528-byte SRAM buffers enable overlapping operations: while one buffer is being written via SI, the other can be programmed into Flash memory. This pipelining eliminates idle time between data reception and nonvolatile storage, effectively doubling sustained write throughput in streaming applications such as audio recording or firmware updates.
Can the AT45DB161B-RC be used with a 5V microcontroller SPI interface?
Yes, the AT45DB161B-RC features 5.0V-tolerant SI, SCK, CS, RESET, and WP pins. These inputs accept 0–5.5V logic levels regardless of VCC voltage (2.5–3.6V), allowing direct connection to 5V MCUs without level-shifting circuitry. However, the SO pin outputs only up to VCC (max 3.6V), so a pull-up resistor to the host's 5V rail is not permitted - use a level translator or 3.3V-tolerant MCU input.
What is the purpose of the RDY/BUSY pin on the AT45DB161B-RC?
The RDY/BUSY pin on the AT45DB161B-RC is an open-drain output that goes low during all self-timed operations - including page program (tEP), page erase (tPE), block erase (tBE), and buffer-to-main-memory transfer (tXFR). It provides hardware synchronization for the host MCU, eliminating the need for software polling of the status register bit 7 and reducing interrupt latency in time-critical applications.
AT45DB161B-RC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 16Mbit
- Memory Organization:
- 528 Bytes x 4096 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT45DB161B-RC FAQ
1.How can I place an order for AT45DB161B-RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161B-RC 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 AT45DB161B-RC reliable?
The price and inventory of AT45DB161B-RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161B-RC is usually 5 days.
3.What payment methods are accepted for AT45DB161B-RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161B-RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161B-RC?
AT45DB161B-RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161B-RC 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 AT45DB161B-RC?
For technical support, including AT45DB161B-RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161B-RC requirements.
6.How does Aetrix verify that AT45DB161B-RC is sourced from the original manufacturer or authorized distributors?
All AT45DB161B-RC 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 AT45DB161B-RC meets industry standards.
7.What is the process for return or replacement of AT45DB161B-RC?
All AT45DB161B-RC units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161B-RC, 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 AT45DB161B-RC part is unused and in its original packaging.
Return procedure for AT45DB161B-RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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