RK73B1HTTC4R3J Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC4R3J is a 4.3 Ohm, ±5% tolerance, 0.05W (1/20W) chip resistor manufactured by KOA Speer Electronics, Inc. in the 0201 (0603 Metric) package format. This component is classified as Automotive AEC-Q200 rated thick film resistor designed for high-reliability applications requiring automotive-grade qualification.

The RK73B1HTTC4R3J carries a product status of "Not For New Designs," indicating that while the part remains available in inventory (1157 Pcs), KOA Speer Electronics has transitioned this model away from active production. Identifying equivalent substitute parts is necessary for ongoing maintenance, repair, and legacy system support where this resistor specification remains functionally required.

Substiute Parts

RK73B1HTTC4R3J

KOA Speer Electronics, Inc.In Stock: 1199RK73B1HTTC4R3J Datasheet

Current PartRFQ

RK73B1HTTCM4R3J

KOA Speer Electronics, Inc.In Stock: 877RK73B1HTTCM4R3J Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73B1HTTC4R3J is determined by strict equivalence across the following parameters:

Critical Matching Parameters:

• Resistance value: 4.3 Ohms (exact match required)
• Tolerance: ±5% (exact match required)
• Power rating: 0.05W / 1/20W (exact match required)
• Package format: 0201 (0603 Metric) (exact match required)
• Automotive qualification: AEC-Q200 (exact match required)

Secondary Matching Parameters:

• Composition: Thick Film (exact match required)
• Temperature coefficient: ±400ppm/°C (exact match required)
• Operating temperature range: -55°C ~ 155°C (exact match required)
• RoHS compliance: ROHS3 Compliant (exact match required)
• Moisture sensitivity: MSL 1 (exact match required)

Substitute parts must satisfy all critical and secondary parameters without deviation. Manufacturer identity is not a substitution barrier provided all electrical and mechanical specifications align precisely.

Parameter Comparison

Engineering Selection Recommendations

The RK73B1HTTCM4R3J is a direct functional equivalent to the RK73B1HTTC4R3J. Both parts are manufactured by KOA Speer Electronics, Inc., belong to the RK73B series, and satisfy identical electrical and mechanical specifications across all critical parameters.

The primary distinction between these parts is product lifecycle status. The RK73B1HTTC4R3J is designated "Not For New Designs," while the RK73B1HTTCM4R3J carries "Active" status. This indicates that KOA Speer Electronics continues to produce and support the RK73B1HTTCM4R3J for ongoing applications.

For applications requiring the 4.3 Ohm, ±5%, 0.05W, 0201 package, AEC-Q200 automotive-rated thick film resistor specification, the RK73B1HTTCM4R3J is the current production equivalent. Both parts maintain identical compliance certifications (ROHS3, REACH Unaffected, AEC-Q200) and identical environmental operating parameters (-55°C ~ 155°C).

Selection between these parts should be based on inventory availability and supply chain continuity requirements. The RK73B1HTTCM4R3J is recommended for new procurement activities due to its active production status.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM4R3J be used as a direct replacement for RK73B1HTTC4R3J in existing designs?

A: Yes. The RK73B1HTTCM4R3J is electrically and mechanically identical to the RK73B1HTTC4R3J. All critical parameters—resistance value, tolerance, power rating, package format, temperature coefficient, operating temperature range, and automotive AEC-Q200 qualification—are identical. No circuit redesign or PCB layout modification is required.

Q: What is the significance of the "Not For New Designs" status on the RK73B1HTTC4R3J?

A: "Not For New Designs" indicates that the manufacturer has transitioned this part number away from active production. While existing inventory remains available and the part continues to function identically to its active equivalent, the manufacturer recommends using the active production equivalent (RK73B1HTTCM4R3J) for new product development to ensure long-term supply chain stability.

Q: Are the physical dimensions and PCB footprints identical between these two parts?

A: Yes. Both parts use the 0201 (0603 Metric) package format 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 are interchangeable without modification.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the RK73B1HTTC4R3J and RK73B1HTTCM4R3J are AEC-Q200 rated automotive-grade thick film resistors. Both satisfy automotive reliability and qualification standards.

Q: What is the difference in the part numbers between RK73B1HTTC4R3J and RK73B1HTTCM4R3J?

A: The difference is the "M" character in the middle of the part number (RK73B1HTTCM4R3J vs. RK73B1HTTC4R3J). This character typically indicates a revision or production variant within the same electrical specification family. Both parts are manufactured by KOA Speer Electronics and maintain identical functional characteristics.

Q: Are there any differences in compliance certifications between these parts?

A: No. Both parts are ROHS3 Compliant, REACH Unaffected, and carry identical moisture sensitivity level (MSL 1 - Unlimited). Regulatory compliance is identical.

Q: Which part should be selected for new procurement?

A: The RK73B1HTTCM4R3J should be selected for new procurement activities. This part carries "Active" product status, indicating ongoing manufacturer support and production availability. The RK73B1HTTC4R3J remains available for legacy system maintenance and repair where existing inventory is sufficient.

Q: Are the temperature coefficients and operating temperature ranges identical?

A: Yes. Both parts have a temperature coefficient of ±400ppm/°C and an operating temperature range of -55°C ~ 155°C. Thermal performance characteristics are identical.