Model & package intelligence
Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
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Technical data
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LM339N 是一款四路电压比较器,华冠(HGSEMI)生产的该型号采用 DIP-14 封装,适合通用型测量与控制电路。器件设计为开集电极输出,兼容 TTL 与 CMOS 逻辑电平,通过简单外部元件即可完成门限检测、窗口比较、欠压保护等功能。
LM339N 在低输入偏置和低失调电压方面表现良好,适合对阈值有一定精度要求的比较场合。开集电极输出需要外接上拉电阻,以决定输出电平与响应速度;上拉电阻越小,开关速度越快但功耗和负载增加。器件静态电流约 800 μA,可用于低功耗设计的权衡评估。注意总电源电压不能超过 36V,单/双电源工作方式灵活选择。
DIP-14 通孔封装便于面包板或 PCB 手工搭建与调试,适合实验与小批量生产。使用时需注意:
由于器件传播延迟约 1.3 μs,不适合要求亚微秒级响应的高速比较。对于低速、低功耗且要求多路比较的应用,LM339N 提供了成本与性能的平衡。布线时注意模拟地与数字地分离,减少共地噪声对比较点的影响。总之,合理选择上拉阻值、必要的输入保护和滞回设计,能最大化 LM339N 在门限检测与监控电路中的可靠性与稳定性。
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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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