W83977G-A Equivalent & Substitute Parts

Part Overview

The W83977G-A is a specialized interface IC manufactured by Nuvoton Technology Corporation in a 128-QFP (14x20) package. This component provides parallel and serial interface functionality with 5V supply voltage support. The product is currently obsolete, making identification of compatible substitute components essential for system redesign, legacy system maintenance, and component sourcing in applications where the original part is no longer available.

Substiute Parts

W83977G-A

Nuvoton Technology CorporationIn Stock: 1191W83977G-A Datasheet

Current PartRFQ

FT221XQ-R

FTDI, Future Technology Devices International LtdIn Stock: 807FT221XQ-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the W83977G-A is determined by the following critical parameters:

• Interface Functionality: The substitute must provide interface bridging capability compatible with parallel and/or serial communication protocols
• Voltage Supply Compatibility: The substitute must operate within or encompass the 5V supply requirement
• Package Compatibility: Physical package dimensions and pin count must accommodate PCB layout constraints
• Regulatory Compliance: RoHS3 compliance and REACH status must be maintained
• Product Availability: The substitute must have active product status with current manufacturing support

The FT221XQ-R meets these substitution criteria through its USB-to-SPI bridge functionality, which provides serial interface capability with flexible voltage support (3.3V ~ 5V) and active product status. Both components maintain ROHS3 compliance and equivalent regulatory standing.

Parameter Comparison

Engineering Selection Recommendations

The FT221XQ-R is the designated manufacturer-recommended substitute for the W83977G-A. Selection of this substitute is supported by the following engineering factors:

• Regulatory Compliance: Both components maintain identical RoHS3, REACH, ECCN, and HTSUS classifications, ensuring regulatory equivalence
• Product Status Transition: The FT221XQ-R holds active product status with current manufacturing support, addressing the obsolescence of the W83977G-A
• Voltage Supply Range: The FT221XQ-R operates across 3.3V to 5V, encompassing the 5V requirement of the original component
• Interface Capability: The FT221XQ-R provides serial interface functionality through USB-to-SPI bridging, suitable for applications requiring serial communication
• Moisture Sensitivity Equivalence: Both components share identical MSL ratings, ensuring equivalent handling and storage requirements

Frequently Asked Questions (FAQ)

Q: Why is the W83977G-A being replaced? A: The W83977G-A is classified as obsolete and no longer manufactured. The FT221XQ-R provides equivalent interface functionality with active product status and current manufacturing support.

Q: Are the packages compatible? A: The W83977G-A uses a 128-QFP (14x20) package, while the FT221XQ-R uses a 20-QFN (4x4) package. These are physically different packages requiring PCB redesign. The FT221XQ-R's smaller footprint may reduce board space requirements.

Q: Will the FT221XQ-R work with 5V systems? A: Yes. The FT221XQ-R operates across 3.3V to 5V supply voltage range, making it compatible with 5V system requirements.

Q: Are there any compliance differences? A: No. Both components maintain identical RoHS3 compliance, REACH status, ECCN classification, and HTSUS codes.

Q: What is the current supply requirement for the FT221XQ-R? A: The FT221XQ-R requires 11mA supply current and operates across -40°C to 85°C temperature range.

Q: Is the FT221XQ-R available in the same packaging format? A: The FT221XQ-R is available in Tape & Reel (TR) packaging, suitable for automated assembly processes.