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Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
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SA555M/TR 是华冠(HGSEMI)出品的单通道定时器芯片,采用 SOP-8 封装,适用于通用计时与脉冲发生应用。主要电气参数:工作电压范围 4.5V 至 16V,工作温度范围 -40℃ 至 +85℃,集成复位功能和关断控制,提供稳定的定时和占空比控制能力,方便在多种嵌入式与模拟控制场景中替代标准 555 系列器件。
芯片包含标准 555 功能块:触发(Trigger)、阈值(Threshold)、放电(Discharge)、比较器与反相器、输出(Output)、控制电压(Control)、复位(Reset,低电平有效)及电源脚(VCC、GND)。复位脚可实现外部强制置低将输出拉低,便于系统级关断;控制电压用于调制内部比较参考,支持频率或占空比的外部调节。
适用于单稳/多稳态脉冲发生、方波/占空比调制、PWM 驱动、延时关断、按键防抖、蜂鸣器与声光报警、LED 闪烁、频率/占空比可调振荡等。其宽电压范畴和工业级温度使得适合工业控制、消费电子及汽车电子等领域的通用定时需求。
常见单稳态宽度:T ≈ 1.1 × R × C;占空比/频率(稳态振荡):f ≈ 1.44 / ((RA + 2RB) × C)。设计时建议选用低温漂电阻和稳定电容以保证长期定时精度。通过在控制脚施加 DC 或 AC 信号,可实现外加调制或速率控制。
为保证稳定工作,建议靠近 VCC 与 GND 丝印处并联 0.01–0.1µF 去耦电容,减小电源杂讯对比较器的影响;复位脚宜上拉至 VCC(通过 10kΩ 左右)并在需要关断时外接低电平;布局上放置关断和控制信号走线短且屏蔽,避免噪声耦合。选型时关注供应链及封装批号,SOP-8 封装便于手工焊接与波峰/回流生产。
SA555M/TR 是一款兼顾传统 555 通用功能与工业级工作条件的单通道定时器,适合需要可靠复位和关断控制的通用计时、脉冲与占空比控制场合。在电源去耦、控制脚滤波与合适元件选型下,可在宽温区间内长期稳定工作。
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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.
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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.
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The original manufacturer part number, datasheet revision, application, critical limits, and acceptable changes are collected before possible candidates are discussed.
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The request connects the previously used model, current demand, package evidence, target timing, and replenishment sourcing route.
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