Equivalent & Substitute Parts for RK73H1HTTC18R2D

Part Overview

The RK73H1HTTC18R2D is an 18.2 Ohm ±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 with moisture-resistant construction and operates across -55°C to 155°C temperature range.

The RK73H1HTTC18R2D carries a product status of "Not For New Designs," indicating it has been superseded in the manufacturer's active product line. Identification of equivalent substitute parts is necessary for ongoing support of existing designs, legacy system maintenance, and procurement continuity.

Substiute Parts

RK73H1HTTC18R2D

KOA Speer Electronics, Inc.In Stock: 815RK73H1HTTC18R2D Datasheet

Current PartRFQ

RK73H1HTTCM18R2D

KOA Speer Electronics, Inc.In Stock: 1018RK73H1HTTCM18R2D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73H1HTTC18R2D is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Resistance value: 18.2 Ohms (exact match required)
• Tolerance: ±0.5% (exact match required)
• Power rating: 0.05W / 1/20W (exact match required)
• Package format: 0201 (0603 Metric) (exact match required)
• Composition: Thick Film (exact match required)
• Temperature coefficient: ±200ppm/°C (exact match required)
• Operating temperature range: -55°C to 155°C (exact match required)
• Automotive qualification: AEC-Q200 (exact match required)

The RK73H1HTTCM18R2D qualifies as a direct substitute because it maintains identical electrical specifications, package dimensions, thermal characteristics, and automotive compliance ratings. The primary distinction is product status transition from obsolete to active manufacturing status within the same RK73H series.

Parameter Comparison

Engineering Selection Recommendations

The RK73H1HTTCM18R2D is the direct equivalent substitute for RK73H1HTTC18R2D. Selection of the substitute part is based on the following engineering criteria:

Product Status Transition: The main part RK73H1HTTC18R2D is designated "Not For New Designs," indicating manufacturer discontinuation of this specific part number. The substitute RK73H1HTTCM18R2D maintains active production status within the same RK73H series, ensuring long-term supply chain availability and manufacturing consistency.

Compliance and Certification: Both parts maintain identical AEC-Q200 automotive qualification, ROHS3 compliance, and REACH unaffected status. No compliance gaps exist between the main part and substitute.

Electrical and Thermal Equivalence: Resistance value, tolerance, power rating, temperature coefficient, and operating temperature range are identical across both parts. Thick film composition and moisture-resistant construction are preserved.

Package and Mechanical Compatibility: Both parts utilize identical 0201 (0603 Metric) package format with matching physical dimensions and termination configuration, ensuring direct PCB layout compatibility without redesign requirements.

Frequently Asked Questions (FAQ)

Q: Can RK73H1HTTCM18R2D be used as a direct replacement for RK73H1HTTC18R2D in existing designs?

A: Yes. The RK73H1HTTCM18R2D is a direct equivalent substitute. All electrical parameters, package dimensions, thermal characteristics, and automotive certifications are identical. No circuit modifications or PCB layout changes are required.

Q: What is the difference between RK73H1HTTC18R2D and RK73H1HTTCM18R2D?

A: The primary difference is product status. RK73H1HTTC18R2D is designated "Not For New Designs" (obsolete), while RK73H1HTTCM18R2D is "Active" in the manufacturer's current product line. Both parts are electrically and mechanically identical.

Q: Are there any moisture sensitivity or storage requirement differences?

A: No. Both parts carry Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no special moisture control requirements during storage or handling.

Q: Will the substitute part function identically in automotive applications?

A: Yes. Both parts maintain AEC-Q200 automotive qualification and identical operating temperature range (-55°C to 155°C). Functional performance in automotive circuits is equivalent.

Q: Is the 0201 package format the same for both parts?

A: Yes. Both parts use 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 of 0.010" (0.26mm). PCB footprints are interchangeable.

Q: Are there any RoHS or environmental compliance differences?

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