RK73H1HTTC37R4D Equivalent & Substitute Parts

Part Overview

The RK73H1HTTC37R4D is a 37.4 Ohms ±0.5% thick film chip resistor manufactured by KOA Speer Electronics, Inc. in 0201 package format with 0.05W power rating. This component is rated for automotive applications under AEC-Q200 standard and features moisture-resistant construction suitable for harsh operating environments.

The RK73H1HTTC37R4D carries a "Not For New Designs" product status, indicating it has been superseded in the manufacturer's product line. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for existing applications or legacy system support.

Substiute Parts

RK73H1HTTC37R4D

KOA Speer Electronics, Inc.In Stock: 759RK73H1HTTC37R4D Datasheet

Current PartRFQ

RK73H1HTTCM37R4D

KOA Speer Electronics, Inc.In Stock: 1133RK73H1HTTCM37R4D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73H1HTTC37R4D is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Resistance value (37.4 Ohms), tolerance (±0.5%), and power rating (0.05W) must be identical. Temperature coefficient (±200ppm/°C) and operating temperature range (-55°C ~ 155°C) establish thermal performance boundaries.

Mechanical Parameters: Package format (0201 / 0603 Metric) and physical dimensions (0.024" L x 0.012" W, 0.010" max height) ensure PCB compatibility and assembly process alignment.

Compliance Parameters: AEC-Q200 automotive qualification, ROHS3 compliance, and MSL 1 rating are mandatory for applications requiring automotive-grade reliability and environmental standards adherence.

Composition: Thick film construction must be maintained to preserve electrical characteristics and thermal stability.

Substitute parts must satisfy all these parameters without deviation. Product status differences (active versus not for new designs) do not affect electrical or mechanical substitutability.

Parameter Comparison

Engineering Selection Recommendations

The RK73H1HTTCM37R4D is a direct electrical and mechanical equivalent to the RK73H1HTTC37R4D. Both components are manufactured by KOA Speer Electronics, Inc. within the RK73H series and share identical specifications across all critical parameters: 37.4 Ohms resistance, ±0.5% tolerance, 0.05W power rating, 0201 package format, and AEC-Q200 automotive qualification.

The primary distinction is product status: RK73H1HTTC37R4D is designated "Not For New Designs," while RK73H1HTTCM37R4D carries "Active" status. This status difference reflects manufacturer lifecycle management and does not indicate functional or performance differences. Both parts maintain ROHS3 compliance, MSL 1 moisture sensitivity rating, and identical thermal and electrical characteristics.

For applications requiring component replacement or supply continuity, the RK73H1HTTCM37R4D provides equivalent performance with the advantage of active manufacturer support and ongoing availability.

Frequently Asked Questions (FAQ)

Q: Can RK73H1HTTCM37R4D replace RK73H1HTTC37R4D in existing designs?

A: Yes. Both components are electrically and mechanically identical. Resistance, tolerance, power rating, package format, and all compliance certifications are equivalent. Direct substitution is valid for all applications.

Q: What does "Not For New Designs" status mean for the RK73H1HTTC37R4D?

A: This designation indicates the part has been superseded in the manufacturer's active product line. It does not affect component performance or reliability. Existing inventory remains functional and suitable for replacement or legacy system support.

Q: Are there any packaging differences between these parts?

A: Both components use 0201 (0603 Metric) package format with identical physical dimensions (0.024" L x 0.012" W, 0.010" max height). PCB footprints and assembly processes are interchangeable.

Q: Do both parts meet automotive standards?

A: Yes. Both RK73H1HTTC37R4D and RK73H1HTTCM37R4D are AEC-Q200 qualified for automotive applications. Temperature range (-55°C ~ 155°C), moisture resistance, and reliability ratings are identical.

Q: What is the significance of MSL 1 rating?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture bake requirements. Both components can be stored and handled without special moisture control procedures.

Q: Are there compliance or regulatory differences?

A: No. Both parts are ROHS3 compliant and REACH unaffected. Environmental and regulatory compliance is equivalent.