RK73H1HTTC8450D Equivalent & Substitute Parts

Part Overview

The RK73H1HTTC8450D is a 845 Ohm ±0.5% 0.05W (1/20W) chip resistor in 0201 package (0603 Metric) manufactured by KOA Speer Electronics, Inc. This component is a thick film, automotive-grade resistor with AEC-Q200 qualification and moisture-resistant properties, designed for high-reliability applications in automotive and industrial environments.

The RK73H1HTTC8450D carries a "Not For New Designs" product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support ongoing production of existing applications where this component is currently deployed.

Substiute Parts

RK73H1HTTC8450D

KOA Speer Electronics, Inc.In Stock: 817RK73H1HTTC8450D Datasheet

Current PartRFQ

RK73H1HTTCM8450D

KOA Speer Electronics, Inc.In Stock: 992RK73H1HTTCM8450D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RK73H1HTTC8450D is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Resistance value: 845 Ohms (exact match required)
• Tolerance: ±0.5% (exact match required)
• Power rating: 0.05W / 1/20W (exact match required)
• Temperature coefficient: ±200ppm/°C (exact match required)
• Operating temperature range: -55°C ~ 155°C (exact match required)

Mechanical Parameters:

• Package / Case: 0201 (0603 Metric) (exact match required)
• Composition: Thick Film (exact match required)

Compliance & Certification:

• Automotive AEC-Q200 qualification (required for automotive applications)
• RoHS3 compliance (required for regulatory conformance)
• Moisture Sensitivity Level 1 (required for reliability)

Substitute parts must match all electrical and mechanical parameters without exception. Compliance certifications must be maintained or exceed the original specification.

Parameter Comparison

Engineering Selection Recommendations

The RK73H1HTTCM8450D is a direct functional equivalent to the RK73H1HTTC8450D. Both components are manufactured by KOA Speer Electronics, Inc., within the RK73H series, and share identical electrical, mechanical, and thermal specifications.

Key Distinction: The RK73H1HTTCM8450D carries an "Active" product status, whereas the RK73H1HTTC8450D is designated "Not For New Designs." This status difference indicates that the RK73H1HTTCM8450D represents the current production equivalent and is the recommended selection for ongoing supply and future production requirements.

Compliance Assurance: Both parts maintain AEC-Q200 automotive qualification, ROHS3 compliance, and MSL 1 rating. The substitute part meets or exceeds all regulatory and reliability requirements of the original component.

Application Continuity: The RK73H1HTTCM8450D provides seamless compatibility for existing designs currently using the RK73H1HTTC8450D, with no circuit redesign or validation required.

Frequently Asked Questions (FAQ)

Q: Can the RK73H1HTTCM8450D be used as a direct replacement for the RK73H1HTTC8450D?

A: Yes. The RK73H1HTTCM8450D is a direct functional equivalent. All electrical parameters (resistance, tolerance, power rating, temperature coefficient), mechanical dimensions, package type, and compliance certifications are identical. No circuit modifications are required.

Q: Why is the RK73H1HTTC8450D marked "Not For New Designs"?

A: This designation indicates that the component has been superseded in the manufacturer's product line. The RK73H1HTTCM8450D is the active production equivalent. For new designs and ongoing production, the RK73H1HTTCM8450D should be specified.

Q: Are there any differences in automotive qualification between these parts?

A: No. Both components carry AEC-Q200 qualification and are suitable for automotive applications. Compliance certifications are equivalent.

Q: What is the significance of the "M" designation in RK73H1HTTCM8450D?

A: The "M" in the part number indicates a manufacturing or specification variant within the RK73H series. However, the electrical and mechanical specifications remain identical to the RK73H1HTTC8450D.

Q: Are the physical dimensions and package compatibility identical?

A: Yes. Both parts use the 0201 package (0603 Metric) with identical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm) and maximum seated height of 0.010" (0.26mm). PCB footprints and assembly processes are interchangeable.

Q: What is the moisture sensitivity level, and does it affect handling?

A: Both parts have MSL 1 (Unlimited), which indicates no moisture sensitivity. Standard handling procedures apply; no special moisture control measures are required during storage or assembly.

Q: Can I mix these parts in the same production batch?

A: Yes. Both components are electrically and mechanically equivalent and carry identical compliance certifications. They can be used interchangeably in the same application and production environment.