Equivalent & Substitute Parts for RK73H1HTTC8451D

Part Overview

The RK73H1HTTC8451D is an 8.45 kOhms ±0.5% thick film chip resistor in 0201 package (0603 Metric) rated for 0.05W (1/20W) power dissipation. This component is designed for automotive applications with AEC-Q200 qualification and moisture-resistant construction. The part is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and transition to active product status where applicable.

Substiute Parts

RK73H1HTTC8451D

KOA Speer Electronics, Inc.In Stock: 898RK73H1HTTC8451D Datasheet

Current PartRFQ

RK73H1HTTCM8451D

KOA Speer Electronics, Inc.In Stock: 1079RK73H1HTTCM8451D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73H1HTTC8451D is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 8.45 kOhms (exact match required)
• Tolerance: ±0.5% (substitutes must achieve this or tighter tolerance)
• Power rating: 0.05W minimum (equal or higher acceptable)
• Package: 0201 (0603 Metric) form factor
• Composition: Thick film construction
• Temperature coefficient: ±200ppm/°C
• Operating temperature range: -55°C to 155°C minimum
• Automotive qualification: AEC-Q200 required
• RoHS compliance: ROHS3 Compliant

Acceptable Variations:

• Product status may differ (Active vs. Not For New Designs)
• Packaging format (Tape & Reel vs. other formats) does not affect electrical compatibility
• Moisture-resistant feature presence does not disqualify substitutes meeting MSL 1

The substitute part RK73H1HTTCM8451D meets all mandatory parameters and represents a direct functional equivalent with improved product status classification.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: RK73H1HTTCM8451D

The RK73H1HTTCM8451D is the direct functional equivalent of RK73H1HTTC8451D. All electrical, thermal, and mechanical parameters are identical. The substitute part carries Active product status, indicating ongoing manufacturer support and availability, whereas the original part is classified as "Not For New Designs."

Selection Basis:

1. Electrical Equivalence: Resistance value, tolerance, power rating, temperature coefficient, and operating temperature range are identical across both parts.

2. Package Compatibility: Both parts use 0201 (0603 Metric) package with identical physical dimensions and termination configuration, ensuring direct PCB footprint compatibility without layout modifications.

3. Automotive Compliance: Both parts meet AEC-Q200 automotive qualification standards, satisfying reliability and quality requirements for automotive applications.

4. Regulatory Compliance: Both parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

5. Product Status Advantage: The substitute part's Active status provides superior long-term supply chain security and manufacturer support compared to the "Not For New Designs" classification of the original part.

Feature Consideration:

The original part explicitly lists "Moisture Resistant" in its feature set, while the substitute part lists only "Automotive AEC-Q200." This difference does not indicate reduced moisture performance; rather, it reflects different marketing documentation. Both parts maintain MSL 1 (Unlimited) moisture sensitivity level, indicating equivalent moisture handling characteristics.

Frequently Asked Questions (FAQ)

Q1: Can RK73H1HTTCM8451D be used as a direct replacement for RK73H1HTTC8451D in existing designs?

A: Yes. The substitute part is electrically and mechanically identical. All critical parameters—resistance value, tolerance, power rating, package dimensions, temperature range, and automotive qualification—match exactly. No circuit modifications or PCB layout changes are required.

Q2: What is the significance of the "Not For New Designs" status on the original part?

A: This designation indicates the manufacturer has superseded the part in their product line. While existing inventory remains available, the manufacturer recommends using the Active equivalent (RK73H1HTTCM8451D) for new designs to ensure long-term supply availability and manufacturer support.

Q3: Are there any differences in moisture handling between the two parts?

A: Both parts maintain MSL 1 (Unlimited) moisture sensitivity level. The original part's explicit "Moisture Resistant" feature designation and the substitute's omission of this label do not indicate functional differences in moisture performance. Both parts are suitable for standard handling and storage conditions without special moisture control requirements.

Q4: Does the substitute part meet automotive AEC-Q200 requirements?

A: Yes. RK73H1HTTCM8451D carries full AEC-Q200 automotive qualification, identical to the original part. Both parts are approved for automotive applications requiring this standard.

Q5: Are the physical dimensions and PCB footprints identical?

A: Yes. Both parts use 0201 (0603 Metric) package with identical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm) and maximum seated height of 0.010" (0.26mm). Direct PCB footprint compatibility is confirmed.

Q6: What is the temperature coefficient difference, and does it affect circuit performance?

A: Both parts have identical temperature coefficient of ±200ppm/°C. No performance difference exists across the operating temperature range of -55°C to 155°C.

Q7: Is RoHS and REACH compliance identical between the two parts?

A: Yes. Both parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements without distinction.

Q8: Can the substitute part be used in high-reliability automotive applications?

A: Yes. The substitute part's AEC-Q200 qualification ensures it meets automotive reliability and quality standards equivalent to the original part. Product status (Active vs. Not For New Designs) does not affect reliability performance.