RK73H1HTTC5490D Equivalent & Substitute Parts

Part Overview

The RK73H1HTTC5490D is a 549 Ohm ±0.5% 0.05W (1/20W) chip resistor in 0201 package (0603 Metric) manufactured by KOA Speer Electronics, Inc. This component features automotive AEC-Q200 qualification and moisture-resistant thick film construction, designed for high-reliability applications requiring precision resistance values in compact form factors.

The RK73H1HTTC5490D carries a "Not For New Designs" product status, indicating that KOA Speer Electronics has transitioned this part to end-of-life. Identifying equivalent substitute parts ensures design continuity, maintains supply chain stability, and enables seamless integration into existing production environments where this resistor is currently specified.

Substiute Parts

RK73H1HTTC5490D

KOA Speer Electronics, Inc.In Stock: 762RK73H1HTTC5490D Datasheet

Current PartRFQ

RK73H1HTTCM5490D

KOA Speer Electronics, Inc.In Stock: 960RK73H1HTTCM5490D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73H1HTTC5490D is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Resistance value (549 Ohms), tolerance (±0.5%), and power rating (0.05W / 1/20W) must be identical. Temperature coefficient (±200ppm/°C) and operating temperature range (-55°C ~ 155°C) establish thermal performance boundaries.

Mechanical Parameters: Package type (0201 / 0603 Metric), physical dimensions (0.024" L x 0.012" W / 0.60mm x 0.30mm), and seated height (0.010" / 0.26mm maximum) ensure PCB layout compatibility and assembly process compatibility.

Compliance & Quality Parameters: AEC-Q200 automotive qualification, thick film composition, RoHS3 compliance, and MSL 1 rating are mandatory for substitute parts intended for equivalent functional replacement.

Product Status Consideration: While the original part is marked "Not For New Designs," substitute parts with "Active" status provide continued availability and manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

The RK73H1HTTCM5490D is the direct equivalent substitute for the RK73H1HTTC5490D. Both components are manufactured by KOA Speer Electronics, Inc., and share identical electrical, mechanical, and compliance specifications across all critical parameters.

The primary distinction is product lifecycle status: the original RK73H1HTTC5490D is designated "Not For New Designs," while the substitute RK73H1HTTCM5490D maintains "Active" status. This transition ensures continued manufacturing support, supply chain availability, and long-term component sourcing stability.

Both parts satisfy AEC-Q200 automotive qualification requirements, ROHS3 compliance, and MSL 1 moisture sensitivity ratings. Physical dimensions and thermal operating ranges are identical, enabling direct PCB layout compatibility and assembly process interchangeability without design modification.

Selection of the RK73H1HTTCM5490D is appropriate for new production runs, design refreshes, and long-term supply chain planning. Existing inventory of the RK73H1HTTC5490D may continue to be utilized in current production until depletion, with transition to the substitute part managed through standard component change control procedures.

Frequently Asked Questions (FAQ)

Q: Can the RK73H1HTTCM5490D be used as a direct replacement for the RK73H1HTTC5490D in existing designs?

A: Yes. The RK73H1HTTCM5490D is electrically and mechanically equivalent to the RK73H1HTTC5490D. All critical parameters—resistance value, tolerance, power rating, package dimensions, temperature coefficient, and automotive qualification—are identical. No design modification is required for substitution.

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

A: "Not For New Designs" indicates that KOA Speer Electronics has transitioned the RK73H1HTTC5490D to end-of-life status and recommends using the RK73H1HTTCM5490D for new product development. Existing inventory may be used in current production, but new designs should specify the Active substitute part.

Q: Are the physical dimensions and package compatibility identical between these two parts?

A: Yes. Both parts use the 0201 package (0603 Metric) with identical dimensions of 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 fully compatible.

Q: Do both parts meet automotive qualification standards?

A: Yes. Both the RK73H1HTTC5490D and RK73H1HTTCM5490D carry AEC-Q200 automotive qualification and are ROHS3 compliant with MSL 1 moisture sensitivity rating, suitable for automotive and high-reliability applications.

Q: What is the difference between the part numbers RK73H1HTTC5490D and RK73H1HTTCM5490D?

A: The difference is indicated by the "M" character in the substitute part number (RK73H1HTTCM5490D). This designates a product lifecycle update within the same RK73H series. The "M" variant represents the current Active production version, while the original part without "M" has been transitioned to end-of-life status.

Q: Are there any thermal or electrical performance differences between these parts?

A: No. Both parts have identical temperature coefficient (±200ppm/°C), operating temperature range (-55°C ~ 155°C), and all electrical specifications. Thermal and electrical performance are equivalent.