High-Voltage Measurement with HVDP08

The HVDP08 is a high-precision voltage divider specifically developed for Battery Management Systems in EV and HEV applications. By combining the resistor elements onto the same substrate in a single package, it significantly reduces PCB space while offering very high precision and reducing system and inventory costs.
 
Combing a ratio tolerance to ±0.1% and TCR tracking to 10 ppm/K, the HVDP08 ensures highly accurate and stable voltage measurements over the full -55 to +155C temperature range. This level of precision is critical for reliable state-of-charge estimation and helps prevent cell imbalance - directly contributing to improved battery performance, safety and lifetime.
 
The device has a working voltage to 1000 V and is available with ratios from 10:1 to 1000:1, enabling easy adaptation to a wide range of high-voltage battery applications. This design flexibility reduces development effort and accelerates time-to-market.
 
Built using metal thin-film technology, the HVDP08 provides excellent long-term stability, low drift and high resilience under thermal and electrical stress. It operates dependably from –55 °C to +155 °C and is AEC-Q200 qualified, ensuring compliance with stringent automotive requirements.
 
The integrated precisely matched resistor pair in the device eliminates mismatch errors common when using discrete solutions. This not only improves measurement accuracy but also reduces calibration effort and system complexity - resulting in lower total cost of ownership and enhanced design reliability.

Precision Sensing with RN73H

The RN73H series is a high-precision thin-film chip resistor designed for applications where measurement accuracy, long-term stability and reliability are critical parameters making it an ideal choice for Battery Management Systems and other demanding automotive and industrial environments.
 
With tolerances down to ±0.05 % and TCR values as low as ±5 ppm/K, the RN73H ensures highly accurate and stable voltage measurements even under changing temperature conditions. This precision directly improves cell voltage monitoring and balancing accuracy in BMS applications, helping to optimize battery performance, extend lifetime and enhance overall system safety.
 
The RN73H is also engineered for exceptional long-term stability, maintaining performance within ±0.1 % drift after 3000 hours at +85 °C. This reduces recalibration requirements and minimizes the risk of measurement errors over the product lifetime - an important consideration for automotive platforms with long service intervals.
 
The resistor’s advanced thin-film technology, combined with a glass passivation layer and a high-heat-resistant epoxy coating, provides superior protection against moisture, corrosion and environmental stress. This results in outstanding reliability even in harsh environments, including high humidity and temperature.
 
In addition, the RN73H offers low current noise and excellent linearity, ensuring signal integrity in precision analog circuits. The availability of the series, in multiple case sizes (0402 to 1210) combined with AEC-Q200 qualification allows flexible integration into space-constrained and safety-critical designs.

Current Detection with TLR Series

The TLR series is a high-performance metal plate current sensing resistor designed for accurate and reliable current measurement in demanding applications such as Battery Management Systems, motor control and power electronics.
 
Built for high-current designs, it combines low resistance values, robust construction and excellent thermal behavior to ensure precise performance under load.
 
With ultra-low resistance values from 0.5 mΩ to 20 mΩ and current ratings up to 100 A, the TLR enables precise current sensing while minimizing power loss. This is critical in BMS designs, where accurate charge and discharge monitoring directly impacts system efficiency, battery protection and energy optimization.
 
The TLR is engineered with low parasitic inductance and excellent temperature characteristics (TCR down to ±50 ppm/K over the full temperature range), ensuring fast and stable signal response even in dynamic load conditions. This allows precise real-time current measurement, supporting reliable control and protection functions in modern battery systems.
 
A key differentiator is KOA’s special “no hotspot” trimming technology, which provides a uniform current flow and an even heat distribution across the resistor element. This significantly enhances reliability under high current loads and reduces the risk of localized overheating - one of the most common failure mechanisms in shunt resistors.
 
The TLR series has low-profile (approx. 0.6–0.7 mm) and is available in multiple standard sizes from 0805 to 2512, enabling flexible integration into space-constrained designs. With an operating temperature capability up to +170 °C and AEC-Q200 qualification, it meets the strict requirements of automotive and industrial applications.
 
From a system perspective, the TLR enables high-efficiency current sensing with maximum reliability, helping engineers reduce thermal stress and improve measurement accuracy, while allowing decision-makers to benefit from enhanced system robustness and fewer field failures.