RK73H1HTTC3R90F Equivalent & Substitute Parts

Part Overview

The RK73H1HTTC3R90F is a 3.9 Ohm ±1% thick film chip resistor in 0201 package (0603 metric) rated for 0.05W (1/20W) power dissipation. This component is designed for automotive applications and meets AEC-Q200 qualification standards with 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 The part is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line.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 flexibility, and transition to active product alternatives that meet identical electrical and mechanical specifications.

Substiute Parts

RK73H1HTTC3R90F

KOA Speer Electronics, Inc.In Stock: 10905RK73H1HTTC3R90F Datasheet

Current PartRFQ

RK73H1HTTCM3R90F

KOA Speer Electronics, Inc.In Stock: 735RK73H1HTTCM3R90F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RK73H1HTTC3R90F are identified based on strict electrical and mechanical parameter matching. The substitution logic is governed by the following criteria:

Electrical Parameters (Non-Negotiable):

• Resistance value must be 3.9 Ohms
• Tolerance must be ±1%
• Power rating must be 0.05W (1/20W) or higher
• Temperature coefficient must be ±400ppm/°C
• Operating temperature range must span -55°C to 155°C

Mechanical Parameters (Non-Negotiable):

• Package must be 0201 (0603 Metric)
• Composition must be thick film
• Number of terminations must be 2

Compliance & Environmental Parameters (Non-Negotiable):

• AEC-Q200 automotive qualification required
• RoHS3 compliance required
• Moisture Sensitivity Level must be MSL 1 or better
• REACH unaffected status required

Product Status Consideration: While the main part is "Not For New Designs," substitute parts with "Active" status are preferred for ongoing production and new design transitions.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: RK73H1HTTCM3R90F

The RK73H1HTTCM3R90F is the direct equivalent substitute for the RK73H1HTTC3R90F. All critical electrical parameters, mechanical dimensions, and compliance certifications are identical. The substitute part carries "Active" product status, indicating it is the current production alternative within the RK73H series from KOA Speer Electronics.

Rationale for Selection:

1. Electrical Equivalence: Identical resistance value (3.9 Ohms), tolerance (±1%), power rating (0.05W), temperature coefficient (±400ppm/°C), and operating temperature range (-55°C to 155°C).

2. Mechanical Compatibility: Same 0201 package footprint (0603 metric), identical physical dimensions (0.024" L x 0.012" W), and height specifications ensure direct PCB assembly compatibility without layout modifications.

3. Automotive Compliance: Both parts meet AEC-Q200 qualification, mandatory for automotive applications. The substitute maintains the same reliability and qualification standards.

4. Regulatory Compliance: RoHS3 compliance and REACH unaffected status are maintained. MSL 1 rating ensures unlimited shelf life and minimal handling restrictions.

5. Supply Chain Continuity: The substitute part is in active production with 652 units in stock, providing reliable availability compared to the obsolete main part (Not For New Designs status).

Implementation Guidance:

For existing designs using RK73H1HTTC3R90F, direct substitution with RK73H1HTTCM3R90F requires no circuit redesign, PCB layout modification, or assembly process changes. The parts are functionally and physically interchangeable. For new designs, RK73H1HTTCM3R90F should be specified as the primary component.

Frequently Asked Questions (FAQ)

Q1: Can RK73H1HTTCM3R90F be used as a direct replacement for RK73H1HTTC3R90F in existing designs?

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

Q2: What is the difference between the main part and the substitute part?

A: The primary difference is product status. RK73H1HTTC3R90F is marked "Not For New Designs," indicating it has been superseded. RK73H1HTTCM3R90F is "Active" production status. Both parts are from the same RK73H series and share identical electrical and mechanical specifications.

Q3: Are there any compatibility concerns with the 0201 package?

A: No. Both parts use the 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). PCB footprints, pick-and-place machine settings, and reflow profiles remain unchanged.

Q4: Does the substitute part maintain AEC-Q200 automotive qualification?

A: Yes. RK73H1HTTCM3R90F carries full AEC-Q200 qualification, meeting automotive reliability and qualification standards identical to the main part.

Q5: What is the moisture sensitivity level, and does it affect handling?

A: Both parts have MSL 1 (Unlimited) rating, meaning unlimited shelf life with no special moisture control requirements during storage or handling. Standard component handling practices apply.

Q6: Is the substitute part RoHS3 compliant?

A: Yes. RK73H1HTTCM3R90F is ROHS3 compliant and REACH unaffected, maintaining full regulatory compliance for automotive and industrial applications.

Q7: Why is the main part marked "Not For New Designs"?

A: This designation indicates the manufacturer has transitioned the product line. RK73H1HTTCM3R90F represents the current active alternative. For new designs and ongoing production, the substitute part should be specified to ensure long-term supply availability and manufacturer support.

Q8: Are there any performance differences in temperature coefficient or operating range?

A: No. Both parts have identical temperature coefficient (±400ppm/°C) and operating temperature range (-55°C to 155°C). Resistance stability and thermal performance are equivalent across the full operating envelope.

Q9: Can the substitute part be used in high-reliability or mission-critical applications?

A: Yes. The substitute part maintains all automotive-grade certifications and reliability ratings. AEC-Q200 qualification ensures suitability for demanding automotive and industrial applications.

Q10: What inventory status should be considered when selecting between these parts?

A: RK73H1HTTC3R90F has 10,846 units in stock but is obsolete. RK73H1HTTCM3R90F has 652 units in stock and is in active production. For new procurement, the substitute part is recommended to ensure continued availability and manufacturer support.