KOA Speer Electronics, Inc. RK73H2ATTD1203F

Summary of KOA Speer RK73H2ATTD1203F

The KOA Speer RK73H2ATTD1203F is a precision 1% tolerance, 120 kΩ chip resistor with a 1/4 watt (0.25W) power rating and 0805 (2012 metric) package size. Designed for a broad range of electronic circuits, it is particularly suited for high-reliability automotive applications, meeting AEC-Q200 standards. Its thick film construction delivers the stable and consistent performance required by design engineers, particularly where compactness and robust environmental performance are critical.

Main Attributes of KOA Speer RK73H2ATTD1203F

A highlight of the RK73H2ATTD1203F is KOA Speer’s wide lineup of chip resistor sizes, ranging from ultra-small 01005 to robust 2512 packages, facilitating flexibility in PCB design and assembly. The RK73H2ATTD1203F stands out for its excellent heat and weather resistance, thanks to the use of a metal glaze thick film technology. It is ideal for both flow and reflow soldering processes, maximizing production efficiency for OEMs and EMS providers.

As industry requirements shift toward environmental responsibility, the RK73H2ATTD1203F features lead-free terminations, providing compliance with EU RoHS regulations. Additionally, it meets the AEC-Q200 standard for automotive-grade reliability, making it an optimal choice for temperature- and stress-demanding environments.

Technical Details and Construction of KOA Speer RK73H2ATTD1203F

The RK73H2ATTD1203F offers a resistance of 120 kΩ with a tight ±1% tolerance, optimized for precise voltage division, signal conditioning, and current-limiting applications. With a 0.25W power rating and 0805 surface-mount package, it integrates well into high-density circuit layouts, allowing engineers to efficiently manage real estate on the PCB.

KOA Speer’s RK73H2ATTD1203F features a robust thick film structure. The construction leverages the stability and reliability of metal glaze, applied to a ceramic substrate, which promotes consistent electrical performance and resilience against environmental stresses. The part supports a wide resistance value range, with different EIA package sizes to match the needs of various design platforms.

Performance Data and Power Derating Instructions for KOA Speer RK73H2ATTD1203F

In systems where ambient temperature exceeds 70°C, the power rating of the RK73H2ATTD1203F must be derated according to KOA Speer’s specified derating curves, which take both ambient and terminal part temperature into account. Adhering to these guidelines is essential; neglecting to manage resistor temperature could compromise long-term reliability and performance.

For pulse load conditions, the maximum applicable voltage is determined by the lesser of the calculated value – the square root of the product of power rating and resistance – or the maximum working voltage. Application engineers should validate performance under actual operating pulse loads, as pulse endurance may vary depending on the system and PCB configuration. KOA Speer recommends verifying real-world performance to confirm product suitability for demanding transient or repetitive pulse applications.

Environmental Standards and Regulatory Compliance of KOA Speer RK73H2ATTD1203F

The RK73H2ATTD1203F is engineered for reliability under adverse conditions. KOA Speer's adherence to AEC-Q200 standard testing across multiple package sizes, including the 0805 variant, addresses requirements for automotive and industrial applications. The part is moisture-resistant, with its thick film technology enhancing durability against environmental effects such as humidity, thermal cycling, and mechanical shock.

Its RoHS compliance via lead-free terminations supports sustainable and responsible product lifecycles, with the exception of allowable lead content in glass compositions as specified for ceramic electronic components. The design is suitable for use in automated assembly, with recommended compatibility for both flow and reflow soldering.

Alternative and Substitute Models for KOA Speer RK73H2ATTD1203F

For design flexibility or procurement risk mitigation, it is important to consider equivalent or replacement models for the KOA Speer RK73H2ATTD1203F. Potential substitutes should match key attributes: 120 kΩ resistance, 1% tolerance, 1/4W power rating, and an 0805 (2012 metric) package with automotive-grade reliability. Other KOA Speer RK73H series models with comparable specifications may serve as direct replacements. Equivalent models from other manufacturers should be evaluated for compatibility with AEC-Q200 qualification, thick film technology, and matching terminal materials to ensure reliable drop-in replacements. Engineers should consult manufacturer datasheets and perform application-level validation when specifying alternatives.

Conclusion

The KOA Speer RK73H2ATTD1203F stands out as a high-performance, precision 120 kΩ resistor in 0805 packaging, tailored for demanding automotive and industrial design requirements. Its combination of robust thick film construction, tight tolerance, wide application compatibility, and compliance with rigorous environmental and quality standards makes it a preferred choice for engineers prioritizing long-term reliability and consistent electrical performance. For procurement and design teams seeking certainty in component selection, the RK73H2ATTD1203F delivers a balanced solution of performance, durability, and environmental responsibility.