Equivalent & Substitute Parts for RK73B1HTTC4R7J

Part Overview

The RK73B1HTTC4R7J is a 4.7 Ohm, ±5% tolerance, 0.05W (1/20W) thick film chip resistor manufactured by KOA Speer Electronics in the 0201 (0603 Metric) package format. This component is rated for automotive applications under AEC-Q200 standards and operates across the temperature range of -55°C to 155°C.

The RK73B1HTTC4R7J carries a product status of "Not For New Designs," indicating that KOA Speer Electronics has transitioned this part to end-of-life status. Identifying equivalent and substitute parts is necessary to support ongoing maintenance, repair, and legacy system requirements where this resistor is currently deployed.

Substiute Parts

RK73B1HTTC4R7J

KOA Speer Electronics, Inc.In Stock: 12092RK73B1HTTC4R7J Datasheet

Current PartRFQ

RK73B1HTTCM4R7J

KOA Speer Electronics, Inc.In Stock: 1007RK73B1HTTCM4R7J Datasheet

MFR RecommendedRFQ

RC0603J4R7CS

Samsung Electro-MechanicsIn Stock: 1070RC0603J4R7CS Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73B1HTTC4R7J is determined by the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 4.7 Ohms
• Tolerance: ±5%
• Power rating: 0.05W (1/20W)
• Package format: 0201 (0603 Metric)
• Composition: Thick Film
• Physical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm)
• Number of terminations: 2
• RoHS compliance: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variation Parameters:

• Temperature coefficient (within ±300ppm/°C to ±400ppm/°C range)
• Operating temperature range (minimum -55°C, maximum up to 155°C or higher)
• Automotive rating (AEC-Q200 or equivalent moisture-resistant features)
• Product status (Active parts are preferred for new sourcing)

Two substitute parts meet these criteria: the RK73B1HTTCM4R7J from KOA Speer Electronics (same manufacturer, active status) and the RC0603J4R7CS from Samsung Electro-Mechanics (alternative manufacturer, active status with moisture-resistant features).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Manufacturer): The RK73B1HTTCM4R7J is the primary substitute for the RK73B1HTTC4R7J. Both parts are manufactured by KOA Speer Electronics and share identical electrical specifications, temperature coefficients, operating temperature ranges, and physical dimensions. The RK73B1HTTCM4R7J maintains active product status, ensuring continued availability and supply chain support. This part is suitable for direct substitution in existing designs and repair applications.

For Cross-Manufacturer Substitution: The RC0603J4R7CS from Samsung Electro-Mechanics is a functionally equivalent alternative. It matches all mandatory parameters including resistance, tolerance, power rating, package format, and physical dimensions. The RC0603J4R7CS features a lower temperature coefficient (±300ppm/°C versus ±400ppm/°C), which represents improved thermal stability. However, the operating temperature range is limited to -55°C ~ 125°C, compared to the original part's -55°C ~ 155°C range. The RC0603J4R7CS is rated for moisture-resistant applications rather than automotive AEC-Q200 certification.

Selection Criteria:

• Use RK73B1HTTCM4R7J when maintaining KOA Speer Electronics supply chain continuity and automotive AEC-Q200 compliance is required.
• Use RC0603J4R7CS when cross-manufacturer sourcing is acceptable and the application operating temperature does not exceed 125°C.
• Verify application temperature requirements before selecting RC0603J4R7CS, as its maximum operating temperature is 30°C lower than the original specification.

Frequently Asked Questions (FAQ)

Q: Can the RK73B1HTTCM4R7J be used as a direct replacement for the RK73B1HTTC4R7J?

A: Yes. The RK73B1HTTCM4R7J is electrically and mechanically identical to the RK73B1HTTC4R7J. Both parts have the same resistance value (4.7 Ohms), tolerance (±5%), power rating (0.05W), package format (0201), temperature coefficient (±400ppm/°C), and operating temperature range (-55°C ~ 155°C). The primary difference is product status: RK73B1HTTCM4R7J is active, while RK73B1HTTC4R7J is not for new designs.

Q: What is the difference between the RC0603J4R7CS and the original RK73B1HTTC4R7J?

A: The RC0603J4R7CS matches the original part in resistance, tolerance, power rating, and package dimensions. The key differences are: (1) manufacturer (Samsung Electro-Mechanics instead of KOA Speer Electronics), (2) temperature coefficient (±300ppm/°C instead of ±400ppm/°C), (3) operating temperature range (-55°C ~ 125°C instead of -55°C ~ 155°C), and (4) feature classification (moisture-resistant instead of automotive AEC-Q200). The RC0603J4R7CS is suitable only for applications where the maximum operating temperature does not exceed 125°C.

Q: Are all three parts physically interchangeable?

A: Yes. All three parts share identical physical dimensions (0.024" L x 0.012" W / 0.60mm x 0.30mm) and maximum seated height (0.010" / 0.26mm). They are all packaged in the 0201 (0603 Metric) format with two terminations. Physical interchangeability is confirmed for PCB assembly and soldering operations.

Q: Which substitute part should be selected for automotive applications?

A: The RK73B1HTTCM4R7J is the appropriate choice for automotive applications. It carries the same AEC-Q200 automotive rating as the original RK73B1HTTC4R7J and is manufactured by the same supplier. The RC0603J4R7CS is rated for moisture-resistant applications but does not carry automotive AEC-Q200 certification.

Q: What is the impact of the temperature coefficient difference between the parts?

A: The RC0603J4R7CS has a temperature coefficient of ±300ppm/°C, compared to ±400ppm/°C for both KOA Speer Electronics parts. A lower temperature coefficient indicates better resistance stability across temperature variations. This difference is allowable for substitution but should be considered in precision applications where resistance drift over temperature is a design constraint.

Q: Can the RC0603J4R7CS be used in applications requiring operation above 125°C?

A: No. The RC0603J4R7CS is specified for operation only up to 125°C. If the application requires operation at temperatures between 125°C and 155°C, the RC0603J4R7CS is not suitable. In such cases, use either the RK73B1HTTC4R7J or RK73B1HTTCM4R7J, both of which are rated to 155°C.

Q: Are all parts RoHS3 compliant?

A: Yes. All three parts (RK73B1HTTC4R7J, RK73B1HTTCM4R7J, and RC0603J4R7CS) are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.