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HXY MOSFET SI2318
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- HXY MOSFET SI2318
- Type
- HXY MOSFET
- Minimum package
- 3000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- HXY MOSFET
- Electronic Component
- SI2318
- Electronic Component
- 1
- Package
- SOT-23
- Electronic Component
- 1 N
- Type
- N
- Electronic Component
- MOSFET
- Electronic Component
- Electronic Component
- Electronic Component
- 0.033g
- Electronic Component
- 1
- Electronic Component
- BM0227225452
- Operating Temperature
- 55℃~+150℃
- Power Dissipation(Pd)
- 1.56W
- Electronic Component
- Electronic Component
- Electronic Component
- 3000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SI2318 产品概述
一、产品简介
SI2318 是华轩阳（HXY）出品的一款小封装 N 沟道场效应管，漏源耐压 40V，连续漏极电流 5A，单片封装 SOT-23。器件定位为低压中等功率开关，适用于便携电子、负载开关与低压转换电路等需体积小、效率要求适中的场合。
二、主要电气参数
- 漏源电压 Vdss：40V
- 连续漏极电流 Id：5A
- 导通电阻 RDS(on)：52mΩ @ Vgs=4.5V, Id=4A；典型 38mΩ @ Vgs=10V
- 阈值电压 Vgs(th)：约 2V
- 耗散功率 Pd：1.56W（SOT-23 包装下，需注意 PCB 散热设计）
- 总栅极电荷 Qg：5.8nC @ Vgs=20V（门极驱动需求参考）
- 输入电容 Ciss：340pF @20V；反向传输电容 Crss：30pF @20V
- 工作温度范围：-55℃ ~ +150℃
三、器件特点与优势
- 低导通损耗：在充分门极驱动（接近 10V）下 RDS(on) 可降至约 38mΩ，适合开关导通损耗敏感的应用。
- 逻辑电平兼容：4.5V 驱动仍能获得较低的 RDS(on)（52mΩ），利于多数微控制器直接驱动（需评估实际电流与温升）。
- 体积小、成本低：SOT-23 封装适合空间受限的消费类及工业控制板。
四、应用建议
- DC-DC 降压转换器的高侧/低侧开关（需评估开关频率与损耗）。
- 电源管理与负载开关（电流在几安培量级、开关频率不极端）。
- 电池保护、便携设备供电切换、马达驱动的小功率段。
五、设计注意事项
- SOT-23 的热阻较大，Pd 标称 1.56W 在无额外散热条件下达不到长期稳定输出，建议在 PCB 上使用加大铜箔散热、短输入/输出走线并考虑热沉过孔。
- 开关损耗与栅极电荷相关：Qg=5.8nC 在高频开关时需选足够驱动能力的门极驱动器以降低切换损耗与热升。
- 若系统门极仅由 3.3V MCU 驱动，注意 RDS(on) 会比 4.5V 情况显著增加，应验证导通损耗和温升是否可接受。
- 关断时注意 Crss 与漏-栅耦合带来的电压尖峰，必要时加 RC 吸收或栅极电阻抑制振铃。
六、采购与替代
SI2318 由华轩阳电子提供，适合追求性价比和体积受限场合的设计。选型时可与其它同类 40V、SOT-23 封装且在 30~100mΩ 级别 RDS(on) 的 N 沟道 MOSFET 对比，重点关注实际 RDS(on) 标称条件、Qg 与封装热性能，以匹配系统驱动与散热能力。
如需样片、封装图或更详细的电气特性曲线，建议向供应商索取数据手册并在实际电路中做功率与热仿真验证。
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