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UniOhm 0603WAF820LT5E
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Uni Ohm 0603WAF820LT5E
- Type
- UNIOHM
- Minimum package
- 5000 圆盘
Technical parameters
- Power
- 100mW
- Electronic Component
- Electronic Component
- Electronic Component
- UNIOHM
- Electronic Component
- 0603WAF820LT5E
- Electronic Component
- 1
- Package
- 0603
- Electronic Component
- SMD Resistor
- Electronic Component
- ±1%
- Electronic Component
- 0.023g
- Electronic Component
- 820mΩ
- Electronic Component
- 1
- Electronic Component
- BM0259584497
- Operating Temperature
- 55℃~+155℃
- Operating Voltage
- 75V
- Electronic Component
- ±800ppm/℃
- Resistor Type
- Resistor
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
0603WAF820LT5E 产品概述
一、产品简介
0603WAF820LT5E 为 UniOhm（台湾）厚膜片式电阻，封装为 0603（1608公制），阻值 820 mΩ（0.82 Ω），精度 ±1%，额定功率 100 mW，温度系数 ±800 ppm/℃，工作温度范围 -55℃ ～ +155℃。该系列以厚膜工艺制造，具有成本效益高、适合自动贴片的特点，适用于对体积、成本和可靠性有平衡要求的低阻应用。
二、主要参数（关键信息）
- 阻值：820 mΩ（0.82 Ω）
- 精度：±1%
- 额定功率：100 mW（基准环境下）
- 最大工作电压：标称 75 V（需结合功率与阻值计算实际允许电压）
- 温度系数（TCR）：±800 ppm/℃（即 ±0.08%/℃）
- 工作温度：-55℃ ～ +155℃
- 封装：0603，卷带包装，适合 SMT 自动贴装
三、额定电流与电压计算（设计参考）
- 最大连续电流（由功率限制）：Imax = sqrt(P/R) ≈ sqrt(0.1 / 0.82) ≈ 0.35 A（约 350 mA）。
- 在 Imax 时的压降：V = I·R ≈ 0.35 × 0.82 ≈ 0.29 V。
- 虽有标称“工作电压 75V”，但在低阻值情况下，实际可施加的连续电压应以功耗限制为准，长期施加远高于约 0.29 V 会超出功率额定并损坏器件。
四、关键性能与设计注意事项
- TCR ±800 ppm/℃，温度变化会带来较明显阻值漂移（每 10℃ 约 0.8%），不适合需要极低温漂的精密基准。
- 作为低阻分流元件，建议在测量电路中采用四线（Kelvin）测量以消减引线与焊盘电阻的影响。
- 受封装尺寸限制，散热能力有限，需在 PCB 设计时考虑热阻与降额策略（随环境温度线性降额至工作温度上限）。
五、PCB 布局与焊接建议
- PCB 布局：短、宽铜箔连接，减小串联电阻与热阻；两端焊盘尽量对称，避免片上温梯度。
- 自动贴装：卷带（T&R）包装，适用于高速贴片机。
- 回流焊：遵循厂商回流曲线，避免长时间高温暴露；焊接后需避免机械应力。
- 清洗：常规清洗剂即可，避免强酸碱或长时间浸泡。
六、典型应用场景
- 低功耗电流采样／分流电阻（便携设备、传感器节点）。
- 电源管理、过流检测及电流限制电路（中小电流范围）。
- 一般电子设备的电阻分压、旁路与信号匹配（在温漂可控范围内）。
七、存储与可靠性
- 存放于干燥环境，避免潮湿与强腐蚀性气体；建议在制造商推荐时间内使用以保证焊接性能。
- 在高温或长期过载情况下，厚膜电阻可能出现阻值漂移或开路，设计时应留有安全裕度并进行必要的老化/可靠性验证。
总结：0603WAF820LT5E 提供了紧凑 0603 封装下的 0.82 Ω、±1% 精度与经济的厚膜解决方案，适合中低电流采样与一般功率受限的电路应用。设计时重点关注功耗限制、温漂与散热布线，以确保长期稳定性。
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