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UniOhm 0805W8F4991T5E
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Uni Ohm 0805W8F4991T5E
- Type
- UNIOHM
- Minimum package
- 5000 圆盘
Technical parameters
- Power
- 125mW
- Electronic Component
- Electronic Component
- Electronic Component
- UNIOHM
- Electronic Component
- 0805W8F4991T5E
- Electronic Component
- 1
- Package
- 0805
- Electronic Component
- SMD Resistor
- Electronic Component
- ±1%
- Electronic Component
- 0.027g
- Electronic Component
- 4.99kΩ
- Electronic Component
- 10
- Electronic Component
- BM0264382918
- Operating Temperature
- 55℃~+155℃
- Operating Voltage
- 150V
- Electronic Component
- ±100ppm/℃
- Resistor Type
- Resistor
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
0805W8F4991T5E 产品概述
一、产品简介
0805W8F4991T5E 为 UniOhm（台湾厚声）出品的厚膜贴片电阻，阻值为 4.99 kΩ，公差 ±1%（F 级），额定功率 125 mW。封装为 0805（2012 公制，约 2.0 × 1.25 mm），适合高密度表面贴装电路板（SMT）应用。额定工作电压 150 V，温度系数（TCR）为 ±100 ppm/°C，工作温度范围 -55℃ 至 +155℃。
二、主要特性
- 厚膜技术，结构稳定、成本优势明显。
- 精度 ±1%，适用于对阻值有较高要求的一般应用。
- 小尺寸 0805 封装，便于高密度布局及自动化贴装。
- 额定功率 125 mW，适合低至中等功率信号和偏置用途。
- 宽温区可靠工作（-55℃ ~ +155℃），适应较苛刻的环境温度变化。
- TCR ±100 ppm/°C，保证随温度变化的阻值漂移在可控范围内。
三、典型应用场景
- 消费类电子与家电：滤波、分压、信号偏置与限流。
- 工业控制与测量：传感器前端、采样网络、参考分压器。
- 通信设备：阻抗匹配、偏置电路、耦合网络。
- 汽车电子（视具体认证与测试结果）：一般车载电子模块的非关键阻值元件。
- 其他 SMT 自动化生产的量产产品。
四、使用与可靠性建议
- 功率与温度降额：在实际电路设计中，应按照工作环境和 PCB 散热条件对 125 mW 额定功率进行降额计算；高温或散热受限时功率能力会下降，建议参考厂商功率降额曲线。
- 焊接与回流工艺：适用于常见的无铅回流焊工艺，建议按照 UniOhm 提供的回流温度曲线与峰值温度限制操作，避免过高峰值温度或长时间高温暴露。
- 机械应力与 PCB 设计：为避免焊接后端子应力导致失效，设计焊盘与阻值周边时应遵循厂家推荐的 land pattern，并避免线路或元件在焊盘附近产生过大机械应力。
- 环境可靠性：厚膜电阻通常需通过湿热、温度循环、焊接热冲击及负载寿命等测试；在关键应用中建议参考厂方完整的可靠性数据并做必要的工程验证。
五、选型与替代方案
- 若需要更高功率或更低 TCR，可考虑更大封装（1206、1210）或金属膜/薄膜电阻器产品。
- 对阻值稳定性和噪声有更高要求的测量/精密放大电路，可优先选用薄膜或金属膜精密电阻。
- 对成本敏感且对温漂容忍度高的通用电路，0805W8F4991T5E 均为性价比良好的选择。
如需完整的电气性能曲线、封装尺寸图或回流焊规范，请告知，我可以帮您整理对应的厂商技术资料或提供 PCB land pattern 建议。
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