KOA Speer Electronics, Inc. RK73H2ATTD2000F

Summary of RK73H2ATTD2000F by KOA Speer Electronics

The RK73H2ATTD2000F is a 200 Ohm, ±1% tolerance, 0.25W (1/4W) chip resistor in 0805 (2012 Metric) package, produced by KOA Speer Electronics. This thick film resistor stands out for its automotive-grade AEC-Q200 qualification and enhanced moisture resistance. The RK73H2ATTD2000F is part of the broader RK73H series, targeting precision circuit applications where stability, reliability, and compactness are vital. Its combination of small footprint and stringent quality testing makes it suitable for demanding environments, especially in automotive and industrial electronics.

Design Characteristics and Material Innovations in RK73H2ATTD2000F

RK73H2ATTD2000F belongs to KOA Speer's RK73H precision series, which offers both 0.5% and 1% tolerance options across a wide array of standard EIA case sizes from 01005 to 2512. It utilizes a metal glaze thick film element on a ceramic substrate, promoting excellent heat and weather resistance. The device’s robust construction is optimized for both flow and reflow soldering processes, supporting flexible PCB assembly strategies.

The RK73H2ATTD2000F features lead-free terminations, in line with RoHS environmental standards (with exemptions for certain internal materials per regulations). These materials contribute to the resistor’s capacity to maintain electrical integrity under varying environmental and operational stresses.

Electrical Properties and Environmental Reliability of RK73H2ATTD2000F

With a power rating of 0.25W at 70°C ambient temperature, the RK73H2ATTD2000F is engineered for reliable operation, provided the power is derated appropriately at higher temperatures as per KOA Speer’s defined derating curves. The component’s maximum rated voltage is determined by the lower value between the calculated result (√Power rating × resistance value) and the specification’s maximum working voltage.

Its AEC-Q200 qualification ensures the RK73H2ATTD2000F meets automotive-grade standards for accelerated stress testing, including thermal cycling, high humidity, and high-temperature operation. This performance profile is critical for ensuring long-term stability and minimal drift in precision measurement and signal conditioning circuits in harsh environments.

The resistor’s thick film technology and stringent quality control also result in high moisture resistance and consistent temperature coefficient behavior. Measurements performed under standardized laboratory conditions confirm its suitability for applications where uniformity of performance and resilience to environmental stressors are mandatory.

Appropriate Use Cases and Essential Engineering Factors for RK73H2ATTD2000F

Engineers selecting the RK73H2ATTD2000F should assess their PCB layout for optimal heat dissipation, especially when approaching the device’s power handling limits. Actual temperature rise will depend on application-specific factors such as copper trace dimensions, airflow, and mounting density. For critical applications, verifying terminal part temperatures and applying derating per KOA Speer guidelines ensures safe, long-term operation.

The RK73H2ATTD2000F’s combination of precise tolerance, small size, and automotive qualification makes it exceptionally suited for:

Automotive ECUs and sensor signal chains

Industrial control and measurement systems

High-density consumer or IoT devices demanding compact, reliable resistors

Any environment where robust solderability and high resistance to moisture or heat cycles are mandatory

In practice, attention should be paid to soldering method compatibility (flow or reflow), and if circuit topologies present significant pulse loading, confirming device pulse endurance directly in application-specific hardware may be warranted.

Alternative or Substitute Models for RK73H2ATTD2000F

When sourcing the RK73H2ATTD2000F or designing for multi-source procurement, engineers may consider alternate case sizes or resistance values within the KOA Speer RK73H series, given their shared technology, construction, and overall performance envelope. Equivalent chip resistors from other manufacturers must also offer 200 Ohms, 1% tolerance, 0.25W rating, 0805 footprint, and, ideally, AEC-Q200 qualification to ensure drop-in compatibility and guaranteed automotive-grade reliability. Reference to detailed datasheets and, where possible, lab verification is recommended to confirm actual equivalence under end-use conditions.

Conclusion

The RK73H2ATTD2000F from KOA Speer Electronics represents a robust choice for designers and procurement engineers requiring a precise, moisture-resistant, automotive-qualified chip resistor in a compact 0805 form factor. Its material technology, environmental resistance, and design flexibility deliver reliable performance for advanced industrial and automotive circuits. Careful consideration of thermal management and qualification requirements, alongside awareness of potential compatible models, ensures successful integration and long-term reliability in demanding electronic systems.