RK73B1HTTC3R0J Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC3R0J is a 3 Ohm ±5% 0.05W (1/20W) chip resistor in 0201 (0603 Metric) package manufactured by KOA Speer Electronics, Inc. This component is a thick film automotive-grade resistor with AEC-Q200 qualification, designed for high-reliability automotive applications. The part carries a "Not For New Designs" status, indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary to support existing designs, manage inventory transitions, and ensure continued component availability for production and maintenance applications.

Substiute Parts

RK73B1HTTC3R0J

KOA Speer Electronics, Inc.In Stock: 810RK73B1HTTC3R0J Datasheet

Current PartRFQ

RK73B1HTTCM3R0J

KOA Speer Electronics, Inc.In Stock: 683RK73B1HTTCM3R0J Datasheet

MFR RecommendedRFQ

RC0603J3R0CS

Samsung Electro-MechanicsIn Stock: 736RC0603J3R0CS Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RK73B1HTTC3R0J are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Electrical Parameters: Resistance value (3 Ohms), tolerance (±5%), and power rating (0.05W / 1/20W) must be identical across all substitute candidates.

Mechanical Parameters: Package type (0201 / 0603 Metric) and physical dimensions (0.024" L x 0.012" W / 0.60mm x 0.30mm) must match exactly to ensure PCB compatibility and assembly process compatibility.

Compliance Parameters: RoHS3 compliance and MSL Level 1 rating are maintained across all substitutes to preserve environmental and handling requirements.

Composition: Thick film construction is consistent across all substitute options.

Substitutes are categorized into two groups: (1) Manufacturer Recommended Equivalent – same manufacturer, active product status; (2) Upgrade Alternative – different manufacturer, enhanced specifications where applicable.

Parameter Comparison

Engineering Selection Recommendations

RK73B1HTTCM3R0J (Manufacturer Recommended Equivalent): This part is the direct successor from KOA Speer Electronics, Inc., maintaining identical electrical specifications, temperature coefficient (±400ppm/°C), and full automotive AEC-Q200 qualification. The part carries Active product status, ensuring long-term availability and supply chain stability. This substitute is recommended for applications requiring continuity with the original design specifications and automotive-grade reliability standards.

RC0603J3R0CS (Upgrade Alternative): This Samsung Electro-Mechanics part meets all core electrical and mechanical requirements (3 Ohms ±5%, 0.05W, 0201 package). The part features a lower temperature coefficient (±300ppm/°C) compared to the main part, which may provide improved stability in temperature-sensitive applications. However, the operating temperature range is limited to -55°C ~ 125°C versus the main part's -55°C ~ 155°C. This part is classified as Moisture Resistant rather than automotive AEC-Q200 qualified. Selection of this upgrade should be based on application-specific temperature requirements and compliance needs.

Both substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard PCB assembly and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM3R0J be used as a direct drop-in replacement for RK73B1HTTC3R0J?

A: Yes. Both parts share identical electrical parameters (3 Ohms ±5%, 0.05W), mechanical dimensions (0201 package, 0.024" L x 0.012" W), temperature coefficient (±400ppm/°C), and operating temperature range (-55°C ~ 155°C). The RK73B1HTTCM3R0J is the active product successor and maintains full AEC-Q200 automotive qualification.

Q: What are the key differences between RC0603J3R0CS and the original RK73B1HTTC3R0J?

A: The RC0603J3R0CS has a lower temperature coefficient (±300ppm/°C versus ±400ppm/°C) and a reduced maximum operating temperature (125°C versus 155°C). The RC0603J3R0CS is rated as Moisture Resistant rather than automotive AEC-Q200. All other electrical and mechanical parameters are identical.

Q: Are all three parts physically compatible with the same PCB footprint?

A: Yes. All three parts use the 0201 (0603 Metric) package with identical dimensions (0.024" L x 0.012" W / 0.60mm x 0.30mm) and height (0.010" / 0.26mm). They are mechanically interchangeable on PCBs designed for 0201 resistors.

Q: Which substitute should be selected for automotive applications?

A: RK73B1HTTCM3R0J is recommended for automotive applications, as it maintains the AEC-Q200 qualification of the original part. RC0603J3R0CS does not carry automotive qualification and should be evaluated against specific application requirements before use in automotive designs.

Q: What is the significance of the "Not For New Designs" status on the main part?

A: This status indicates that KOA Speer Electronics, Inc. has discontinued the RK73B1HTTC3R0J for new product designs. The RK73B1HTTCM3R0J is the recommended active replacement. Existing designs using the original part should transition to the recommended equivalent for long-term supply assurance.

Q: Are moisture sensitivity levels identical across all three parts?

A: Yes. All three parts carry MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions and compatibility with standard storage and handling procedures.