1. Certification Difference: The 2SCR553RHZGTL is explicitly marked with "Grade: Automotive" and "Qualification: AEC-Q101," while this information is absent from the 2SCR553RTL specifications. The RHZGTL variant is an automotive-qualified version; its manufacturing process and test standards (such as temperature cycling, high-temperature/high-humidity, and long-term life testing) comply with the AEC-Q101 automotive reliability requirements. The RTL variant is likely a standard industrial-grade product that has not undergone the complete automotive qualification process. 2. Reliability Grade and Application Scope: The underlying nature of the above difference is a divergence in reliability assurance level. The RHZGTL is suitable for extremely demanding automotive environments (e.g., engine compartments, powertrain systems), with target failure rates and quality control standards exceeding those of standard industrial components. The RTL is intended for general applications such as consumer and industrial electronics. Although their core electrical parameters are identical, they must not be interchanged in critical systems where tolerance for failure risk is low. 3. Price: The instance where the RHZGTL (automotive grade) is priced slightly lower than the RTL (industrial grade) represents minor market fluctuation. This is not the general rule and does not constitute a substantive difference. Typically, automotive-grade components command a higher price due to the additional testing and assurance costs involved.