Model & package intelligence
Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
Available for RFQ
Technical data
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
PCF8574M/TR(HGSEMI 华冠)是一款小体积、低功耗的 I2C 总线 8 位远程 I/O 扩展器,适用于对 I/O 口数量、体积及功耗有较高要求的嵌入式系统。器件通过标准 I2C 接口与主控器通信,并提供可编程的 8 路双向 I/O,便于快速扩展微控制器的口线数量。
PCF8574M/TR 在总线上以字节方式读写,每次访问可读写 8 位口线状态。器件支持远程中断机制,当口线作为输入且状态发生预定变化时,会通过 INT 引脚通知主控,主控随后读取器件寄存器以获知具体状态。由于输出为开漏结构,外部上拉电阻是必要的,以形成定义电平并限定上拉速率。
优势:体积小、低静态电流、宽电压范围、支持多设备级联、带中断减少主控轮询开销。
注意事项:由于 I/O 为开漏/需外部上拉,输入/输出时序与上拉阻值需匹配系统速率;高电流驱动场景应考虑器件发热与板级散热设计;在 100 kHz 标准模式以外的速率兼容性需在设计前验证。
如需样片、器件引脚图或参考电路(含上拉电阻与中断接入示例),可提供进一步的资料与原理图示例,便于加速产品开发与验证。
Request for quote
Use the form for single models, category sourcing, and multi-line BOM requirements.
Product sourcing intelligence
WMSIC turns product data, package visuals, BOM context, and sourcing signals into practical RFQ notes for buyers.
Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
BOM lines are compared by package, parameters, quantity, and workable alternatives for cleaner sourcing decisions.
Stock routes, quotation confidence, lead-time notes, and shipment feasibility are checked before sales follow-up.
Buyer sourcing scenarios
Typical RFQ scenarios based on the WMSIC form fields, catalog data, manual review steps, and shipment preparation workflow.
The buyer shares the full part number, package requirement, quantity, destination, and available product photos so the quotation can record the exact version under review.
A multi-line BOM is organized into direct sourcing lines, lines that need package clarification, and lines where alternative-part review is permitted.
The original manufacturer part number, datasheet revision, application, critical limits, and acceptable changes are collected before possible candidates are discussed.
Sample quantity, minimum packing, package format, target date, and courier destination are kept together in one RFQ conversation.
Package photos, model markings, board context, and the quantity needed for repair help focus the sourcing review on the relevant version.
When a suffix or package note is incomplete, the response records the open difference and requests buyer confirmation before procurement proceeds.
Packing format, carton notes, invoice details, courier option, destination, and tracking handoff are coordinated around the confirmed order.
The request connects the previously used model, current demand, package evidence, target timing, and replenishment sourcing route.
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