RK73H1HTTC42R2D Equivalent & Substitute Parts

Part Overview

The RK73H1HTTC42R2D is a 42.2 Ohm ±0.5% thick film chip resistor manufactured by KOA Speer Electronics, Inc., designed for 0.05W (1/20W) applications in the 0201 (0603 Metric) package format. This component is rated for automotive applications under AEC-Q200 standards and features moisture-resistant construction suitable for harsh operating environments.

The RK73H1HTTC42R2D carries a product status of "Not For New Designs," indicating it has been superseded in the manufacturer's active product line. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and transition to actively supported alternatives that meet identical electrical and mechanical specifications.

Substiute Parts

RK73H1HTTC42R2D

KOA Speer Electronics, Inc.In Stock: 882RK73H1HTTC42R2D Datasheet

Current PartRFQ

RK73H1HTTCM42R2D

KOA Speer Electronics, Inc.In Stock: 658RK73H1HTTCM42R2D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73H1HTTC42R2D is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Resistance value: 42.2 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 & Package Parameters:

• Package format: 0201 (0603 Metric) (exact match required)
• Composition: Thick Film (exact match required)
• Number of terminations: 2 (exact match required)

Compliance & Certification Parameters:

• Automotive rating: AEC-Q200 (exact match required)
• RoHS status: ROHS3 Compliant (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Substitute parts must match all parameters listed above. Differences in product status (Active vs. Not For New Designs) do not affect electrical or mechanical compatibility but indicate manufacturing lifecycle stage.

Parameter Comparison

Engineering Selection Recommendations

The RK73H1HTTCM42R2D is a direct electrical and mechanical equivalent to the RK73H1HTTC42R2D. Both components are manufactured by KOA Speer Electronics, Inc., within the RK73H series and share identical specifications across all critical parameters: 42.2 Ohm resistance, ±0.5% tolerance, 0.05W power rating, 0201 package format, thick film composition, ±200ppm/°C temperature coefficient, -55°C to 155°C operating range, and AEC-Q200 automotive certification.

The primary distinction is product lifecycle status: the RK73H1HTTC42R2D is designated "Not For New Designs," while the RK73H1HTTCM42R2D carries "Active" status. This indicates the RK73H1HTTCM42R2D represents the current production alternative within the manufacturer's active portfolio.

Both parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and REACH unaffected status, ensuring regulatory alignment for automotive and industrial applications. Selection between these parts should be based on supply chain availability and design lifecycle requirements rather than electrical performance, as they are functionally interchangeable.

Frequently Asked Questions (FAQ)

Q: Can the RK73H1HTTCM42R2D be used as a direct replacement for the RK73H1HTTC42R2D?

A: Yes. The RK73H1HTTCM42R2D meets all electrical, mechanical, and compliance specifications of the RK73H1HTTC42R2D. Both components are identical in resistance value (42.2 Ohms), tolerance (±0.5%), power rating (0.05W), package format (0201), composition (thick film), temperature coefficient (±200ppm/°C), operating temperature range (-55°C to 155°C), and automotive certification (AEC-Q200). Direct substitution is supported without circuit redesign or re-qualification.

Q: What is the significance of the "Not For New Designs" status on the RK73H1HTTC42R2D?

A: "Not For New Designs" indicates the part has been superseded in the manufacturer's active product line. Existing designs using this part may continue to source it during its remaining lifecycle, but new designs should transition to the active equivalent, the RK73H1HTTCM42R2D, to ensure long-term supply chain continuity and manufacturer support.

Q: Are there any differences in packaging or moisture sensitivity between these parts?

A: No. Both the RK73H1HTTC42R2D and RK73H1HTTCM42R2D are supplied in 0201 (0603 Metric) package format with identical physical dimensions (0.024" L x 0.012" W, 0.60mm x 0.30mm) and maximum seated height (0.010", 0.26mm). Both carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Q: Do both parts meet automotive and regulatory requirements?

A: Yes. Both components are AEC-Q200 certified for automotive applications, ROHS3 compliant, and REACH unaffected. They are suitable for use in automotive, industrial, and harsh environment applications requiring moisture-resistant thick film resistors with tight tolerance specifications.

Q: What is the difference between the part numbers RK73H1HTTC42R2D and RK73H1HTTCM42R2D?

A: The part numbers differ only in the suffix: "TC" versus "TCM." This suffix variation reflects the manufacturer's internal designation for product lifecycle management. The "M" variant (RK73H1HTTCM42R2D) represents the active production version, while the non-M variant (RK73H1HTTC42R2D) is in end-of-life status. Electrically and mechanically, they are equivalent.