My Inquiry
My Account
Microchip Technology AT45DB161B-CNC-2.5
- Part No.:
- AT45DB161B-CNC-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VDFN
- Datasheet:
-
AT45DB161B-CNC-2.5.pdf
- Description:
- IC FLASH 16MBIT SPI 15MHZ 8CASON
- Quantity:
- Payment:
- Shipping:
Inventory:4,758
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT45DB161B-CNC-2.5 from Microchip Technology (formerly Atmel) is a 2.5V-only serial DataFlash memory IC with SPI interface, 16 Mbit capacity (4096 × 528-byte pages), dual 528-byte SRAM buffers, and hardware write protection. It enables continuous array read for code shadowing in embedded microcontrollers and supports page/block erase with single-cycle reprogram capability.
For engineers reviewing the AT45DB161B-CNC-2.5 datasheet, AT45DB161B-CNC-2.5 pinout, AT45DB161B-CNC-2.5 application, or AT45DB161B-CNC-2.5 equivalent, key selection criteria include 2.5V operation, 20 MHz SPI clock support, 5.0V-tolerant control inputs (CS/SCK/SI/WP/RESET), RDY/BUSY open-drain signaling, and buffer-assisted streaming write capability.
Technical Context
The AT45DB161B-CNC-2.5 implements a dedicated SPI-based Flash architecture with two independent 528-byte SRAM buffers enabling concurrent data reception and nonvolatile memory reprogramming. Its command set includes 24-bit addressable main memory reads (Continuous Array Read, Main Memory Page Read), buffer-to-memory program with built-in erase, and discrete page/block erase operations.
It operates exclusively in SPI Mode 0 or Mode 3, with data latched on SCK rising edge (SI) and output on falling edge (SO). The RDY/BUSY pin provides hardware flow control during self-timed internal operations including page program (tEP ≤ 20 ms), block erase (tBE ≤ 40 ms), and page-to-buffer transfer (tXFR ≤ 1.5 ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 16 Mbit (17,301,504 bits) organized as 4096 pages × 528 bytes each |
| Supply Voltage | 2.5V only - fixed low-voltage operation requiring no voltage scaling circuitry |
| SPI Clock Frequency | Up to 20 MHz - enables high-throughput data streaming in resource-constrained systems |
| Active Read Current | 4 mA typical - minimizes power budget impact during firmware/code execution |
| Standby Current | 2 µA typical - supports ultra-low-power sleep modes in battery-powered devices |
| Input Voltage Tolerance | 5.0V-tolerant on CS, SCK, SI, WP, RESET - simplifies level-shifting with 3.3V/5V host controllers |
| Operating Temperature | Commercial range (0°C to +70°C) - validated for standard industrial ambient conditions |
Pinout & Package
AT45DB161B-CNC-2.5 is packaged in a 28-pin TSOP (Thin Small Outline Package) with Type 1 pinout, optimized for compact PCB layout and SPI signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command initiation; must remain low during full instruction sequence |
| SCK | Serial Clock | Input-only clock controlling data timing; rising edge latches SI, falling edge outputs SO |
| SI | Serial Input | Input-only data line for opcodes, addresses, and buffer writes; MSB-first protocol |
| SO | Serial Output | Output-only data line for read data and status register; tri-stated when CS high |
| WP | Hardware Write Protect | Active-low pin blocking reprogram of first 256 pages; 5.0V-tolerant for direct MCU GPIO connection |
| RESET | Chip Reset | Active-low asynchronous reset of internal state machine; 5.0V-tolerant; internal POR eliminates external RC network |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during all self-timed operations (erase/program/transfer) |
| VCC / GND | Power Supply | 2.5V ±0.2V supply with decoupling required; GND pin placement supports noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 528-byte buffers allow simultaneous data reception into one buffer while programming the other into Flash - enabling true continuous data streaming |
| Continuous Array Read | Single opcode (68H/E8H) + 24-bit address initiates wraparound sequential read across entire memory without address updates - ideal for boot code shadowing |
| Page-Level Reprogram | Single-cycle erase-and-program per 528-byte page eliminates separate erase step - reduces firmware update latency and simplifies driver logic |
| Hardware Write Protection | WP pin physically disables programming of first 256 pages (132 KB) - prevents accidental corruption of bootloader or configuration sectors |
| 5.0V-Tolerant Control Inputs | CS, SCK, SI, WP, RESET accept 5.0V logic levels directly - removes need for level shifters when interfacing with legacy 5V MCUs |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
Use Scenario: Storing and updating application firmware in an industrial PLC with limited board space and no parallel bus. IC Role / Device Role / Timing Role: Nonvolatile storage for field-upgradable firmware images accessed via SPI by ARM Cortex-M4 host. Use Value: 2.5V operation reduces system power; dual buffers allow background download while executing current firmware; 20 MHz SPI enables fast OTA updates. | Use Scenario: Booting a DSP from external memory by copying critical initialization code into internal RAM before execution. IC Role / Device Role / Timing Role: Serial Flash providing contiguous executable code stream to host processor's prefetch engine. Use Value: Continuous Array Read mode delivers zero-gap sequential access across page boundaries - eliminates wait states during code fetch. |
| Data Logging | Configuration Storage |
Use Scenario: Recording sensor readings every 100 ms in a battery-powered environmental monitor with 10-year lifetime target. IC Role / Device Role / Timing Role: High-endurance data sink using page-erase-and-program cycles with wear leveling managed by host MCU. Use Value: 2 µA standby current extends battery life; hardware WP protects last 256 pages containing calibration constants from overwrite. | Use Scenario: Persisting user settings, network credentials, and calibration offsets in a medical diagnostic device requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter store with atomic page-level updates and hardware lock bits. Use Value: Page Erase + Buffer Program allows reliable single-page updates without erasing adjacent configuration sectors; 2.5V supply ensures compatibility with low-noise analog subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB161D-CNU | Same 16 Mbit density and 2.5V supply, but supports 2.7V–3.6V range and wider temperature grade (–40°C to +85°C); pin-compatible TSOP package | Required for extended temperature industrial deployments where ambient exceeds 70°C | Select AT45DB161D-CNU when operating outside commercial temperature range or needing flexible VCC tolerance. |
| W25Q16JVSSIQ | 16 Mbit Quad SPI Flash; 3.3V only; supports QSPI x4 mode (80 MHz effective); no SRAM buffers; different command set and no RDY/BUSY pin | Used where higher throughput justifies QSPI interface complexity and host driver rewrite | Choose W25Q16JVSSIQ only if migrating to Quad SPI infrastructure and accepting loss of buffer-assisted streaming capability. |
Compared with AT45DB161B-CNC-2.5, AT45DB161D-CNU offers broader voltage/temperature compliance with identical pinout and feature set, while W25Q16JVSSIQ trades buffer concurrency and RDY/BUSY signaling for higher bandwidth via Quad SPI - making it unsuitable for real-time streaming without host-side buffering.
Availability
AT45DB161B-CNC-2.5 is available at Aetrix Electronics and suitable for firmware storage, code shadowing, data logging, and configuration storage applications requiring stable component supply, long-term lifecycle assurance, and consistent 2.5V serial Flash performance.
Supply support for AT45DB161B-CNC-2.5 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 family, including documentation, validation, and long-term supply commitments.
The AT45DB161B-CNC-2.5 belongs to the DataFlash® series designed specifically for SPI-based embedded systems needing concurrent read/write capability, low-voltage operation, and hardware-managed reliability - targeting cost-sensitive, space-constrained applications where parallel Flash is impractical.
FAQ
What is the exact memory organization of the AT45DB161B-CNC-2.5?
The AT45DB161B-CNC-2.5 contains 17,301,504 bits of Flash memory organized into 4096 pages, each exactly 528 bytes (512 data + 16 overhead bytes). It also integrates two independent 528-byte SRAM data buffers. This structure enables page-level erase/program operations and buffer-assisted streaming without interrupting host CPU execution. The AT45DB161B-CNC-2.5 does not use sector-based addressing like standard NOR/NAND Flash.
Does the AT45DB161B-CNC-2.5 support SPI Mode 0 and Mode 3 only?
Yes, the AT45DB161B-CNC-2.5 explicitly supports only SPI Mode 0 (CPOL = 0, CPHA = 0) and SPI Mode 3 (CPOL = 1, CPHA = 0), as confirmed in the official datasheet. It does not support Mode 1 or Mode 2. The device samples the SCK idle state on each CS falling edge to auto-detect the active mode. The AT45DB161B-CNC-2.5 requires strict adherence to these two modes for reliable opcode decoding and data transfer.
Can the AT45DB161B-CNC-2.5 be used with a 3.3V microcontroller without level shifters?
Yes - the AT45DB161B-CNC-2.5 has 5.0V-tolerant inputs on CS, SCK, SI, WP, and RESET pins, allowing direct connection to 3.3V (or even 5V) microcontrollers without external level shifters. However, VCC must be supplied at 2.5V ±0.2V, and SO output swings from GND to VCC (2.5V), so host MCU input thresholds must accommodate 2.5V logic levels. The AT45DB161B-CNC-2.5 is not 3.3V-tolerant on VCC.
What is the purpose of the RDY/BUSY pin on the AT45DB161B-CNC-2.5?
The RDY/BUSY pin on the AT45DB161B-CNC-2.5 is an open-drain output that signals internal operation status: pulled low during self-timed actions (page program, block erase, buffer transfer, compare), and high otherwise. It enables hardware flow control, eliminating the need for constant status register polling. External 1 kΩ pull-up is required. The AT45DB161B-CNC-2.5 uses this pin to prevent command collisions and ensure deterministic timing in real-time systems.
Is the AT45DB161B-CNC-2.5 pin-compatible with the original AT45DB161?
Yes - the AT45DB161B-CNC-2.5 is 100% compatible with the AT45DB161 as stated in the datasheet, sharing identical pinout, command set, timing parameters, and electrical characteristics. It is a drop-in replacement offering enhanced reliability and updated manufacturing process. All existing AT45DB161 firmware drivers, PCB layouts, and schematics function unchanged with the AT45DB161B-CNC-2.5.
AT45DB161B-CNC-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VDFN
- Packaging:
- Tray
- 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:
- 15 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-CASON (6x8)
AT45DB161B-CNC-2.5 FAQ
1.How can I place an order for AT45DB161B-CNC-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161B-CNC-2.5 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-CNC-2.5 reliable?
The price and inventory of AT45DB161B-CNC-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161B-CNC-2.5 is usually 5 days.
3.What payment methods are accepted for AT45DB161B-CNC-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161B-CNC-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161B-CNC-2.5?
AT45DB161B-CNC-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161B-CNC-2.5 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-CNC-2.5?
For technical support, including AT45DB161B-CNC-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161B-CNC-2.5 requirements.
6.How does Aetrix verify that AT45DB161B-CNC-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB161B-CNC-2.5 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-CNC-2.5 meets industry standards.
7.What is the process for return or replacement of AT45DB161B-CNC-2.5?
All AT45DB161B-CNC-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161B-CNC-2.5, 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-CNC-2.5 part is unused and in its original packaging.
Return procedure for AT45DB161B-CNC-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB161B-CNC-2.5 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
