Equivalent & Substitute Parts for RK73B1HTTC1R3J

Part Overview

The RK73B1HTTC1R3J is a 1.3 Ohm ±5% 0.05W thick film chip resistor in 0201 package (0603 metric) manufactured by KOA Speer Electronics, Inc. This component is rated for automotive applications under AEC-Q200 standard with an operating temperature range of -55°C to 155°C. The part is currently classified as Not For New Designs, necessitating identification of equivalent and substitute components for ongoing production and maintenance applications.

Substiute Parts

RK73B1HTTC1R3J

KOA Speer Electronics, Inc.In Stock: 1183RK73B1HTTC1R3J Datasheet

Current PartRFQ

RK73B1HTTCM1R3J

KOA Speer Electronics, Inc.In Stock: 1112RK73B1HTTCM1R3J Datasheet

MFR RecommendedRFQ

RC0603J1R0CS

Samsung Electro-MechanicsIn Stock: 1077RC0603J1R0CS Datasheet

UpgradeRFQ

RMCF0201FT1R00

Stackpole Electronics IncIn Stock: 41705RMCF0201FT1R00 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RK73B1HTTC1R3J is determined by the following critical parameters:

Primary Substitution Criteria:

• Package / Case: 0201 (0603 Metric) - physical compatibility requirement
• Power Rating: 0.05W (1/20W) - electrical performance requirement
• Composition: Thick Film - material specification
• RoHS Status: ROHS3 Compliant - regulatory compliance
• Moisture Sensitivity Level: 1 (Unlimited) - environmental tolerance

Secondary Compatibility Factors:

• Resistance value tolerance range
• Operating temperature range
• Temperature coefficient stability
• Automotive or industrial ratings where applicable

The substitute parts are grouped into two categories: direct equivalents maintaining identical electrical specifications, and functional upgrades offering improved performance characteristics within the same physical package.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent - RK73B1HTTCM1R3J:

The RK73B1HTTCM1R3J is the recommended direct equivalent for RK73B1HTTC1R3J replacement. This part maintains identical electrical specifications (1.3 Ohms ±5%, 0.05W), package configuration (0201), and automotive qualification (AEC-Q200). The primary advantage is Active product status, ensuring continued availability and supply chain stability. Temperature performance parameters (-55°C ~ 155°C) and regulatory compliance (ROHS3, MSL 1) are identical. This substitute is suitable for direct board-level replacement without circuit redesign.

Functional Upgrade - RMCF0201FT1R00:

The RMCF0201FT1R00 from Stackpole Electronics Inc provides improved tolerance performance (±1% versus ±5%) while maintaining identical power rating, package, and temperature range. This part carries AEC-Q200 automotive qualification and ROHS3 compliance. The resistance value differs at 1 Ohm nominal, requiring circuit verification for tolerance stack-up compatibility. This upgrade is applicable when tighter tolerance specifications are required within the same thermal and power envelope.

Functional Upgrade - RC0603J1R0CS:

The RC0603J1R0CS from Samsung Electro-Mechanics offers improved temperature coefficient stability (±300ppm/°C versus ±400ppm/°C) and moisture-resistant construction. However, this part lacks AEC-Q200 automotive certification and operates within a reduced temperature range (-55°C ~ 125°C). The resistance value is 1 Ohm nominal. This substitute is applicable only for non-automotive applications or where the reduced temperature range is acceptable.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM1R3J be used as a direct replacement for RK73B1HTTC1R3J?

A: Yes. Both parts share identical electrical specifications (1.3 Ohms ±5%, 0.05W), package configuration (0201), temperature range (-55°C ~ 155°C), and automotive qualification (AEC-Q200). The primary difference is product status; RK73B1HTTCM1R3J is Active while the original is Not For New Designs. No circuit modifications are required.

Q: What is the impact of using RMCF0201FT1R00 with 1 Ohm resistance instead of 1.3 Ohms?

A: The resistance difference of 0.3 Ohms represents approximately 23% deviation from the original specification. Circuit-level impact depends on application context. Tolerance stack-up analysis is required to determine acceptability. The improved tolerance (±1%) may offset the nominal value difference in some applications.

Q: Why does RC0603J1R0CS have a lower maximum operating temperature?

A: RC0603J1R0CS is specified for -55°C ~ 125°C maximum operating temperature, compared to -55°C ~ 155°C for the original part. This represents a 30°C reduction in upper temperature limit. This part is unsuitable for automotive applications requiring full AEC-Q200 temperature range compliance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (RK73B1HTTCM1R3J, RC0603J1R0CS, RMCF0201FT1R00) maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the original part's regulatory status.

Q: Which substitute is recommended for automotive applications?

A: For automotive applications requiring AEC-Q200 certification, RK73B1HTTCM1R3J (direct equivalent) or RMCF0201FT1R00 (upgraded tolerance) are appropriate selections. RC0603J1R0CS lacks automotive qualification and is not suitable for AEC-Q200 applications.

Q: What is the packaging difference between substitute parts?

A: RK73B1HTTCM1R3J and RMCF0201FT1R00 are supplied in Tape & Reel (TR) format. RC0603J1R0CS is supplied in Cut Tape (CT) format. All three maintain identical 0201 (0603 metric) package configuration for board-level compatibility.