WSL0805R0680FEA - 68mΩ 0.125W Current Sense Resistor 0805 | Vishay Dale
料号： WSL0805R0680FEA ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.52 | $0.52 |
| 10 | $0.46 | $4.60 |
| 100 | $0.38 | $38.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.26 | $260.00 |
| 5,000 | $0.21 | $1,050.00 |
WSL0805R0680FEA 概述
A current-sense resistor is a specialized low-ohmic-value component placed in series with a load to develop a small, accurate voltage drop proportional to load current, allowing measurement via an ADC or comparator. Within the broader component taxonomy, it sits under discrete resistors -> chip resistors -> surface-mount resistors -> current-sense resistors -> metal-strip/element current-sense resistors. Unlike general-purpose thick-film resistors, current-sense devices use a low-temperature-coefficient metal alloy element with four-terminal (Kelvin) construction in larger case sizes to minimize the influence of lead resistance; the WSL0805 is a two-terminal device optimized for compact, low-side sensing.
Key features of the WSL0805R0680FEA include 68 mΩ ±1% tolerance, a ±75 ppm/°C temperature coefficient, anti-sulfur construction, moisture resistance, and pulse-withstanding capability. The 0805 footprint measures 2.0 mm x 1.25 mm, making it suitable for high-density PCB layouts where board space is constrained. The metal-element technology provides superior pulse and overload handling compared with thick-film alternatives.
Technical depth: The metal-strip element is laser-trimmed to a tight resistance value, and the low TCR of 75 ppm/°C keeps the effective ohm value stable across automotive temperature ranges (-65 °C to +170 °C). With 0.125 W continuous rating and 68 mΩ, the resistor can handle a continuous current of approximately 1.36 A (P = I²R) without exceeding rated power, while brief pulses can be much higher thanks to the low thermal mass.
Typical applications include DC-DC converter current feedback, battery management system (BMS) charge/discharge monitoring, motor control current sensing, automotive ECU power monitoring, and switch-mode power supply (SMPS) over-current protection. The AEC-Q200 qualification makes it a strong choice for under-the-hood automotive electronics where sulfur and humidity resistance are required.
When designing with this part, place it as close as possible to the load and use a 4-wire (Kelvin) routing pattern when available; the 2-terminal pad layout naturally forms a slight parasitic inductance that may matter in fast-switching circuits above 1 MHz. Decoupling the downstream amplifier input minimizes switching noise coupling into the sense signal.
This page synthesizes real distributor pricing, AEC-Q200 automotive-grade drop-in alternatives, and practical PCB layout notes not found in the standalone datasheet PDF.
直接替换替代料： WSL0805R0680FEA ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
WSLP0805R0680FEA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
WSL0805R0680FEA-
✅ 直接替换📋 参考替代料（不在目录中）
WSL0805R0700FEA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
WSL0805R0680FTR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ERJ6DSFWR068V
✅ 直接替换📋 参考替代料（不在目录中）
UCR10EVHFSR068
✅ 直接替换📋 参考替代料（不在目录中）
WSL0805R0680FEA 最大额定值与电气特性
| Resistance | 68 mΩ (0.068 Ω) |
| Tolerance | ±1% |
| Power Rating | 0.125 W (1/8 W) |
| Temperature Coefficient | ±75 ppm/°C |
| 封装 / 外壳 | 0805 (2012 Metric) |
| Footprint Dimensions | 2.0 mm x 1.25 mm |
| 安装类型 | Surface Mount (SMD) |
| Composition | Metal Element (Metal Strip) |
| 工作温度 | -65 °C to +170 °C |
| Automotive Qualification | AEC-Q200 |
| Anti-Sulfur | Yes |
| Moisture Resistant | Yes |
| Pulse Withstanding | Yes |
| Current Sense Type | Low-side / Two-terminal |
| RoHS 状态 | Compliant |
| Packaging | Tape & Reel (T/R) |
WSL0805R0680FEA 引脚配置
| 引脚 1 | Terminal 1 — Solder pad end 1 - one side of the resistive element |
| 引脚 2 | Terminal 2 — Solder pad end 2 - opposite side of the resistive element |
典型应用
WSL0805R0680FEA 适用于 6 应用s: DC-DC Converter Current Feedback, Battery Management System (BMS) Monitoring, BLDC Motor Drive Current Sensing, Automotive ECU Power Monitoring, USB-C PD Cable Current Sense, Industrial PLC Isolated Current Loop Sensing.
DC-DC Converter Current Feedback
The WSL0805R0680FEA is placed in series with a buck converter's high-side or low-side switch path to develop a small mV-scale feedback signal for the controller's current-sense amplifier. At 68 mΩ and a 1 A load, the sense voltage is 68 mV - low enough to minimize conduction loss yet high enough to be cleanly digitized by a 12-bit ADC. Compared with sense resistors using ±200 ppm/°C TCR, the WSL's ±75 ppm/°C holds sense accuracy tighter across the converter's operating temperature window, reducing slope-compensation error and improving line/load regulation in 5 V to 24 V POL converter designs. The 0805 footprint fits comfortably within 0.5 in² brick layouts for telecom and server power supplies.
推荐
Battery Management System (BMS) Monitoring
In lithium-ion battery packs and 12 V/48 V automotive battery management systems, the WSL0805R0680FEA provides per-cell or pack-level current sensing with AEC-Q200 qualification suited to the harsh under-hood environment. At 10 A discharge current, the resistor develops 680 mV, easily resolved by the BMS AFE's differential amplifier. Its ±75 ppm/°C TCR keeps coulomb-counting accuracy within ±0.5 % across -40 °C to +85 °C automotive operating windows - critical for accurate state-of-charge (SOC) estimation. Anti-sulfur construction also protects against H₂S exposure that can degrade standard thick-film resistors in battery enclosures. The 0.125 W envelope accommodates continuous 1.3 A - sufficient for low-power 12 V accessory rails; parallel sense resistors can scale this for traction applications.
推荐
BLDC Motor Drive Current Sensing
Brushless DC motor drives for drones, e-bikes, and small industrial servos use the WSL0805R0680FEA in each phase leg's low-side return path to provide per-shunt current feedback for FOC algorithms. The 0.125 W rating handles continuous 1.3 A comfortably, while the metal-strip construction withstands the high di/dt transients seen during PWM commutation without resistance drift. Compared with thin-film sensors, the WSL's pulse-withstanding design keeps measurement stable through motor-start inrush events, improving torque estimation accuracy. The 0805 footprint integrates into compact ESC boards, and the -65 °C to +170 °C range supports both consumer and industrial motor designs.
推荐
Automotive ECU Power Monitoring
Body-control modules, ADAS sensor ECUs, and LED-driver ECUs in vehicles use the WSL0805R0680FEA to monitor 5 V/12 V supply current draw for diagnostic and load-management purposes. With AEC-Q200 qualification, anti-sulfur construction, and a -65 °C to +170 °C operating range, it survives under-hood and chassis-mounted environments that disqualify commercial-grade thick-film resistors. At a 1 A load the sense voltage is 68 mV, easily amplified by automotive-grade op-amps such as the TLV376IDBVR. The 0805 footprint uses 1.5x of board area versus 0603, easing inspection and rework during automotive PPAP validation cycles.
推荐
USB-C PD Cable Current Sense
USB-C Power Delivery adapters and downstream-facing ports use the WSL0805R0680FEA in the VBUS return path to monitor cable current up to 5 A (3 A continuous in default PD contracts). The 68 mΩ sense value drops 340 mV at 5 A - well within the 5 V tolerance after error budgeting - and supports current advertisement back to the PD controller per the USB-C protocol. With ±75 ppm/°C TCR, the WSL maintains advertised current thresholds across the full -10 °C to +70 °C consumer environment without false over-current events. The 0805 case fits within standard Type-C connector PCBs along with the STUSB4500QTR PD controller.
推荐
Industrial PLC Isolated Current Loop Sensing
Programmable Logic Controllers and industrial 4-20 mA / 0-10 V analog input modules use the WSL0805R0680FEA to convert loop current into a measurable voltage for ADC sampling and galvanic isolation. With 68 mΩ resistance, a 4-20 mA signal develops only 0.27-1.36 mV - so an external low-offset amplifier (e.g. precision zero-drift op-amp) is recommended - but the pulse-withstanding design protects against ESD and surge transients common on long factory cabling. The metal-strip element keeps calibration stable over years of service in 24/7 production lines, reducing field-trim frequency versus thick-film alternatives. The 0805 case fits into slim analog-input PCBs adjacent to ISO7240 isolators.
推荐
推荐产品汇总
工程参考数据： WSL0805R0680FEA ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | WSLP0805R0680FEA | ERJ6DSFWR068V | UCR10EVHFSR068 | WSL0805R0700FEA |
|---|---|---|---|---|---|
| Package | 0805 (2012 Metric) | 0805 (2012 Metric) - same | 0805 (2012 Metric) - same | 0805 (2012 Metric) - same | 0805 (2012 Metric) - same |
| Resistance | 68 mΩ | 68 mΩ | 68 mΩ | 68 mΩ | 70 mΩ |
| Tolerance | ±1% | ±1% | ±1% | ±1% | ±1% |
| Power Rating | 0.125 W | 0.4 W (+220%) | 0.125 W | 0.25 W (+100%) | 0.125 W |
| TCR | ±75 ppm/°C | ±75 ppm/°C | ±100 ppm/°C | ±100 ppm/°C | ±75 ppm/°C |
| AEC-Q200 | Yes | Yes | Yes (Panasonic auto grade) | Yes (ROHM auto grade) | Yes |
| Brand | Vishay Intertechnology | Vishay Intertechnology (same brand) | Panasonic | ROHM Semiconductor | Vishay Intertechnology (same brand) |
| Max Continuous Current (calc) | ~1.36 A | ~2.42 A | ~1.36 A | ~1.92 A | ~1.34 A |
关键差异点
- AEC-Q200 qualified with anti-sulfur and moisture-resistant construction （对比 ERJ6DSFWR068V)
- Industry-standard 0.125 W in compact 0805 footprint with global multi-source availability （对比 WSLP0805R0680FEA)
- Lower TCR (75 ppm/°C) for tighter sense accuracy over temperature （对比 UCR10EVHFSR068)
设计说明
Use a Kelvin (4-wire) routing pattern where possible: run the load current through the two outer pads and route the sense traces from dedicated inner pads to the amplifier. The 0805 land pattern naturally forms a small parasitic loop inductance that can disturb the sense voltage in fast-switching (>1 MHz) applications - keep trace lengths under 5 mm and avoid sharp bends. Place the amplifier bypass capacitor within 2 mm of its supply pin to avoid noise pickup on the high-impedance sense line.
At 0.125 W continuous, the 0805 case dissipates heat into its PCB pads - estimate the resulting pad temperature rise at approximately 25-35 °C above ambient on a standard 1 oz copper 4-layer board. For sustained loads above 1 A, consider paralleling the WSL0805R0680FEA with a second identical resistor on the same thermal island, or upgrade to the WSLP0805R0680FEA (0.4 W) which shares the same 0805 footprint. Never operate continuously above 110 °C pad temperature or the resistance may drift beyond the initial ±1% tolerance.
Do not use a thick-film 0805 resistor (e.g. RMCF0805FT523K at 523 kΩ) as a substitute - the resistance is wrong by ~7.7 million times, and thick-film TCR will ruin current-sense accuracy. Also avoid placing the WSL0805R0680FEA near switching-node heat sources that could locally shift the resistance beyond ±1%. For shunt designs above 5 A, calculate I²R heating carefully: at 5 A continuous, dissipation would be 1.7 W - far above the 0.125 W rating and an immediate reliability risk. [Estimated pad temperature rise using standard 1 oz copper 4-layer PCB assumption.]
合规信息
AEC-Q200 qualified (not AEC-Q100). RoHS and REACH compliant per Vishay product specifications. Anti-sulfur construction per ASTM B809-95.
