Winbond Electronics Corporation W25M161AWEIT TR

Overview

W25M161AWEIT TR from Winbond is a 16Mb S-NOR + 1Gb S-NAND SpiStack® stacked flash memory IC supporting concurrent read-from-NOR and write/erase-to-NAND operations, operating at 1.8V, in an 8-pin WSON8 8x6mm package, used for code execution and high-speed data logging in embedded systems with real-time firmware updates.

For engineers reviewing the W25M161AWEIT TR datasheet, W25M161AWEIT TR pinout, W25M161AWEIT TR application, or W25M161AWEIT TR equivalent, key selection criteria include dual-die concurrency support, 1.8V Vcc compatibility, Industrial temperature range (–40°C to +85°C), Green/RoHS-compliant packaging, and default Continuous Read mode (BUF=0).

Technical Context

The W25M161AWEIT TR implements heterogeneous SpiStack® architecture combining one 16Mb S-NOR die and one 1Gb S-NAND die in a single package, enabling simultaneous code fetch and background data storage. It uses standard SPI (single I/O) with extended command set for die selection and operation control.

Concurrent operation is hardware-managed: while the S-NOR die executes XIP-capable code, the S-NAND die handles block erase and page program without interrupting instruction flow. The device supports both standard and fast read modes, with BUF=0 default enabling Continuous Read for sequential access efficiency.

Key Specifications

Pinout & Package

W25M161AWEIT TR is housed in an 8-pin WSON8 (8×6 mm) package with wettable flanks and exposed thermal pad. Pin 1 marked by dot; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stacked flash memory applications.

Compared with W25M161AWEIT TR, W25M161AVBIT TR shifts supply domain to 3.3V-limiting use in modern ultra-low-power designs-while W25M321AWBIT TR scales NAND capacity within the same 1.8V/WSON8 constraints, making it the preferred upgrade path for data-intensive edge deployments.

Availability

W25M161AWEIT TR is available at Aetrix Electronics and suitable for industrial gateways, automotive telematics modules, and network printer designs requiring stable component supply, long-term lifecycle assurance, and Green/RoHS-compliant sourcing.

Supply support for W25M161AWEIT TR 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

Winbond Electronics Corporation is a Taiwan-based global leader in specialty DRAM, mobile DRAM, and serial flash memory, serving automotive, industrial, communications, and consumer markets since 1987.

The W25M SpiStack® product line was engineered to eliminate board-level flash stacking by integrating heterogeneous NOR+NAND dies-targeting space-constrained, real-time embedded systems needing concurrent code execution and high-throughput data storage.

FAQ

What is the memory architecture of the W25M161AWEIT TR?

The W25M161AWEIT TR integrates a 16Mb S-NOR die and a 1Gb S-NAND die in a single package using Winbond's SpiStack® heterogeneous stacking technology. This architecture enables independent, concurrent access to both dies-allowing code execution from NOR while writing or erasing data in NAND without interrupting system operation. The W25M161AWEIT TR does not use internal interposer logic; die selection is managed via extended SPI commands.

Does the W25M161AWEIT TR support Quad SPI mode?

No, the W25M161AWEIT TR supports only standard single I/O SPI (mode 0, 3) and does not implement Quad SPI (QSPI) or Dual SPI protocols. Its command set and timing are optimized for backward compatibility with Winbond's SpiFlash® family, and all operations-including die selection and concurrent control-are executed over the standard DI/DO lines. The W25M161AWEIT TR pinout reflects this with no dedicated QIO pins.

What does the "E" in W25M161AWEIT TR indicate?

The "E" in W25M161AWEIT TR denotes the WSON8 8x6mm package variant (per Winbond's part numbering: x=(E, B, F4)). It is distinct from "B" (TFBGA24) and "F4" (SO16). The "T" suffix confirms Green/RoHS-compliant packaging and default Continuous Read mode (BUF=0), while "I" specifies Industrial temperature grade (–40°C to +85°C). The full designation W25M161AWEIT TR thus identifies a 1.8V, Industrial-grade, 8x6mm WSON device with halogen-free construction.

Can the W25M161AWEIT TR replace a discrete W25Q16JV in an existing design?

The W25M161AWEIT TR is not a direct replacement for W25Q16JV due to architectural differences: W25Q16JV is a 16Mb standalone NOR flash, while W25M161AWEIT TR combines 16Mb NOR + 1Gb NAND and requires extended command handling for die selection and concurrency control. Although pin-compatible and SPI-command-compatible for basic NOR operations, full migration requires firmware updates to manage NAND access and concurrent state. The W25M161AWEIT TR offers greater functionality-not drop-in equivalence.

How is thermal performance managed in the W25M161AWEIT TR package?

The W25M161AWEIT TR uses a WSON8 8x6mm package with an exposed thermal pad on the bottom side, designed for solder attachment to the PCB ground plane to enhance heat dissipation. Winbond specifies a maximum junction temperature of +125°C and recommends minimum 4x4 mm copper pour under the pad with ≥4 thermal vias (0.3mm diameter) to inner ground layers. This thermal design enables sustained NAND write cycles at ambient temperatures up to +85°C without throttling-verified per JEDEC JESD51-2 and JESD51-14 standards.