The **WSBS-13A-R** is a high-precision, automotive-grade power shunt resistor manufactured by Vishay Dale. It is specifically engineered for high-current sensing applications where low resistance and high stability are critical. --- ## 1. Core Technical Specifications The following table summarizes the primary electrical and physical characteristics of the WSBS-13A-R: | Parameter | Specification | | :--- | :--- | | **Resistance Range** | 100 µΩ (0.0001 Ω) | | **Power Rating** | 36 W (current dependent) | | **Tolerance** | ±5.0% | | **Temperature Coefficient (TCR)** | < ±200 ppm/°C | | **Inductance** | < 5 nH | | **Operating Temp Range** | -65 °C to +170 °C | | **Technology** | Power Metal Strip® | --- ## 2. Key Electronic Features ### Power Metal Strip® Technology The device utilizes a solid metal manganese-copper alloy resistive element. Unlike traditional thick-film resistors, this construction provides: * **Low Thermal EMF:** Minimizes voltage errors caused by temperature gradients (< 3 µV/°C). * **High Pulse Capability:** Excellent at handling sudden surges in current without degradation. ### Low Resistance Value With a resistance of only **100 micro-ohms**, the part minimizes power loss ($P = I^2R$). This allows it to measure currents exceeding 600 Amps while generating minimal heat compared to standard resistors. ### AEC-Q200 Qualified This part is "Automotive Grade," meaning it has undergone rigorous testing for mechanical shock, vibration, and moisture resistance, ensuring reliability in harsh environments. --- ## 3. Physical Design and Mounting The **"13A"** in the part number refers to the specific physical dimensions and terminal configuration. * **Terminal Style:** It features massive copper terminals that are typically bolted or welded to a busbar. * **Size:** It is significantly larger than standard surface-mount resistors to facilitate heat dissipation. * **Construction:** The all-welded construction ensures electrical stability over the lifetime of the vehicle or system. --- ## 4. Typical Applications The WSBS-13A-R is primarily used as a current sensor in: 1. **Battery Management Systems (BMS):** Monitoring the state of charge (SoC) and health (SoH) of EV batteries. 2. **Electric Power Steering (EPS):** Sensing high-current motor feedback. 3. **Inverters:** Measuring high-voltage DC link currents. 4. **Solar Power Arrays:** Monitoring high-current DC outputs.