Winbond Electronics Corporation W19B320ABT7H

Overview

W19B320ABT7H from Winbond is a 32 Mbit (4M × 8 / 2M × 16) flexible-bank CMOS flash memory operating at 2.7–3.6 V, supporting simultaneous read/write across independent banks with zero latency, 70 ns read access time, and hardware write protection via #WP/ACC pin - deployed in embedded boot code storage for industrial controllers and network edge devices.

For engineers reviewing the W19B320ABT7H datasheet, W19B320ABT7H pinout, W19B320ABT7H application, or W19B320ABT7H equivalent, key selection considerations include its TFBGA48 (6×8 mm²) package, CFI-compliant interface, sector-level erase suspend/resume capability, and dual-mode byte/word configuration controlled by #BYTE pin.

Technical Context

The W19B320ABT7H implements a four-bank architecture (Bank1: 4M, Bank2: 12M, Bank3: 12M, Bank4: 4M), enabling concurrent read from one bank while erasing or programming another. Its command-set supports CFI query, AUTOSELECT identification, and accelerated programming via #WP/ACC at VHH.

Hardware features include RY/#BY status output for cycle completion detection, #RESET-driven state machine reset, and dual-function #WP/ACC pin supporting both write protection (VIL) and program acceleration (VHH). Sector protection is implemented via VID-assisted hardware lock and temporary unprotect using #RESET at VID.

Key Specifications

Pinout & Package

W19B320ABT7H is packaged in 48-ball TFBGA (6×8 mm², ball pitch 0.40 mm), optimized for space-constrained PCB layouts in networking and industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S29GL032N90TFI010 and MX29GL320EHTI-90G, W19B320ABT7H uniquely delivers zero-latency concurrent bank access, factory-lockable Security Sector for ESN, and VHH-accelerated programming - making it optimal for industrial and automotive systems demanding field-upgradable secure boot with minimal update downtime.

Availability

W19B320ABT7H is available at Aetrix Electronics and suitable for industrial PLC firmware storage, network router boot memory, and medical device calibration data applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for W19B320ABT7H 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 is a Taiwan-based semiconductor company specializing in specialty memory solutions, including NOR/NAND flash, SRAM, and audio codecs, serving industrial, communications, and consumer markets since 1987.

The W19B320ABT7H belongs to Winbond's W19B series of flexible-bank flash memories, designed specifically for embedded systems requiring concurrent firmware execution and update capabilities in space-constrained, low-power environments.

FAQ

What is the package type and pin count of the W19B320ABT7H?

The W19B320ABT7H uses a 48-ball TFBGA package with 6×8 mm² footprint and 0.40 mm ball pitch. This compact, surface-mount package supports high-density PCB layouts in industrial and networking equipment. The pinout is JEDEC-compliant for byte- and word-wide operation, with dedicated #BYTE, #WP/ACC, and RY/#BY signals enabling flexible system integration. All pin functions are fully documented in the official Winbond datasheet revision A4.

Does the W19B320ABT7H support simultaneous read and write operations?

Yes, the W19B320ABT7H supports true simultaneous read and write operations across independent banks - for example, reading firmware from Bank 1 while erasing or programming Bank 2 - with zero latency. This capability is enabled by its flexible four-bank architecture (4M/12M/12M/4M) and is confirmed in Section 6.1.4 of the datasheet. It eliminates CPU stalls during in-field firmware updates and is essential for real-time embedded systems requiring uninterrupted operation.

What is the function of the #WP/ACC pin on the W19B320ABT7H?

The #WP/ACC pin on the W19B320ABT7H serves two distinct hardware functions: at VIL (≤0.8 V), it permanently protects the two outermost 8 Kbyte boot sectors from program/erase regardless of software protection status; at VHH (8.5–12.5 V), it enables accelerated programming mode, reducing byte programming time to 5 μs typical. The pin must never be left floating, and VHH must only be applied during accelerated programming - applying VHH outside this context risks device damage, as specified in Section 6.1.11 and 6.1.2.

How does the Security Sector work in the W19B320ABT7H?

The W19B320ABT7H includes a 256-byte Security Sector that operates as one-time-programmable (OTP) memory. It can be shipped either factory-locked (DQ7 = "1", ESN preprogrammed) or customer-lockable (DQ7 = "0", blank for user-defined use). Access requires a specific command sequence to enter/exit the sector, and once locked, contents cannot be erased. This feature enables secure device identification and cryptographic key storage, and is detailed in Sections 6.1.13 and 7.8 of the datasheet.

Is the W19B320ABT7H compatible with standard flash memory interfaces?

Yes, the W19B320ABT7H is fully compliant with the Common Flash Interface (CFI) specification, allowing host systems to auto-detect device parameters (geometry, command set, timing) directly from on-chip registers. It also supports JEDEC-standard byte- and word-wide pinouts and command sequences including AUTOSELECT, sector erase, chip erase, and unlock bypass. These features ensure drop-in compatibility with existing flash memory drivers and programming tools, as verified in Sections 2, 7.5, and 6.2 of the datasheet.