Equivalent & Substitute Parts for RK73B1HTTC1R2J

Part Overview

The RK73B1HTTC1R2J is a 1.2 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temperature range of -55°C to 155°C. The part is currently classified as "Not For New Designs," indicating it has been superseded. Identifying equivalent and substitute parts is necessary to support existing designs, ensure supply chain continuity, and evaluate active alternatives that meet the same electrical and mechanical requirements.

Substiute Parts

RK73B1HTTC1R2J

KOA Speer Electronics, Inc.In Stock: 844RK73B1HTTC1R2J Datasheet

Current PartRFQ

RK73B1HTTCM1R2J

KOA Speer Electronics, Inc.In Stock: 653RK73B1HTTCM1R2J Datasheet

MFR RecommendedRFQ

RC0603J1R0CS

Samsung Electro-MechanicsIn Stock: 1077RC0603J1R0CS Datasheet

UpgradeRFQ

RC0603J1R2CS

Samsung Electro-MechanicsIn Stock: 1118RC0603J1R2CS Datasheet

UpgradeRFQ

RMCF0201FT1R00

Stackpole Electronics IncIn Stock: 41705RMCF0201FT1R00 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73B1HTTC1R2J is determined by the following critical parameters:

Primary Matching Criteria:

• Resistance value: 1.2 Ohms
• Tolerance: ±5%
• Power rating: 0.05W (1/20W)
• Package: 0201 (0603 Metric)
• Composition: Thick Film

Secondary Compatibility Factors:

• Operating temperature range must encompass or match the original specification (-55°C ~ 155°C)
• Moisture Sensitivity Level: 1 (Unlimited)
• RoHS3 compliance required
• Physical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm)

Substitution Categories:

Direct Equivalent (Manufacturer Recommended): RK73B1HTTCM1R2J matches all primary and secondary parameters identically. This part is the active production equivalent from the same manufacturer series.

Functional Equivalents (Resistance & Tolerance Match): RC0603J1R2CS from Samsung Electro-Mechanics provides identical resistance (1.2 Ohms) and tolerance (±5%) with the same package and power rating. Operating temperature range is -55°C ~ 125°C, which is narrower than the original but covers standard industrial and automotive applications.

Upgrade Alternatives (Lower Resistance, Higher Tolerance Precision): RC0603J1R0CS (1 Ohm, ±5%) and RMCF0201FT1R00 (1 Ohm, ±1%) are available for applications where slightly lower resistance values are acceptable. RMCF0201FT1R00 offers superior tolerance (±1%) and maintains the full -55°C ~ 155°C temperature range with AEC-Q200 rating.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select RK73B1HTTCM1R2J. This part is the active production equivalent from KOA Speer Electronics and maintains all electrical, thermal, and compliance characteristics of the original RK73B1HTTC1R2J. Both parts share the same series designation (RK73B), identical resistance (1.2 Ohms), tolerance (±5%), power rating (0.05W), operating temperature range (-55°C ~ 155°C), and AEC-Q200 automotive qualification. The primary distinction is product status: RK73B1HTTCM1R2J is active, while the original is not recommended for new designs.

For Automotive Applications Requiring AEC-Q200 Compliance: RMCF0201FT1R00 from Stackpole Electronics Inc is qualified. This part maintains AEC-Q200 rating, the full -55°C ~ 155°C operating temperature range, and ±400ppm/°C temperature coefficient. The resistance value is 1 Ohm with superior ±1% tolerance. This substitution is valid where the lower resistance value is acceptable within circuit design margins and the improved tolerance provides additional precision.

For General Industrial Applications Without Automotive Qualification Requirements: RC0603J1R2CS from Samsung Electro-Mechanics provides an exact resistance and tolerance match (1.2 Ohms, ±5%) with identical package and power rating. The operating temperature range is -55°C ~ 125°C, which is suitable for standard industrial environments. This part is available in high inventory (1031 Pcs) and offers cost efficiency for non-automotive applications.

For Applications Tolerating Slightly Lower Resistance Values: RC0603J1R0CS from Samsung Electro-Mechanics (1 Ohm, ±5%) is available as an alternative where circuit design permits a 0.2 Ohm reduction. This part shares the same package, power rating, and temperature range as RC0603J1R2CS.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical physical dimensions (0.024" L x 0.012" W).

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM1R2J be used as a direct replacement for RK73B1HTTC1R2J?

A: Yes. RK73B1HTTCM1R2J is the manufacturer-recommended equivalent. Both parts have identical electrical specifications (1.2 Ohms ±5%, 0.05W), package (0201), operating temperature range (-55°C ~ 155°C), and AEC-Q200 automotive rating. The primary difference is product status: RK73B1HTTCM1R2J is active production, while RK73B1HTTC1R2J is not recommended for new designs.

Q: What is the difference between the Samsung RC0603J1R2CS and the original KOA part?

A: RC0603J1R2CS matches the resistance (1.2 Ohms) and tolerance (±5%) exactly. Both use 0201 package and 0.05W power rating. The key difference is operating temperature range: RC0603J1R2CS operates -55°C ~ 125°C versus the original's -55°C ~ 155°C. Additionally, RC0603J1R2CS has a ±300ppm/°C temperature coefficient compared to ±400ppm/°C for the original. RC0603J1R2CS is not AEC-Q200 rated and is suitable for non-automotive applications.

Q: Can RMCF0201FT1R00 replace the RK73B1HTTC1R2J?

A: RMCF0201FT1R00 is a functional substitute with important distinctions. It maintains the full -55°C ~ 155°C operating temperature range and AEC-Q200 automotive qualification. However, the resistance is 1 Ohm instead of 1.2 Ohms, representing a 0.2 Ohm difference. The tolerance is superior at ±1% versus ±5%. This substitution is valid only where circuit design permits the lower resistance value and the improved tolerance is beneficial or neutral.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (RK73B1HTTCM1R2J, RC0603J1R2CS, RC0603J1R0CS, and RMCF0201FT1R00) are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile.

Q: Which substitute part has the best availability?

A: RMCF0201FT1R00 from Stackpole Electronics Inc has the highest inventory at 41,608 pieces in stock, compared to 1,031 pieces for RC0603J1R2CS, 1,056 pieces for RC0603J1R0CS, and 641 pieces for RK73B1HTTCM1R2J.

Q: What is the significance of the 0201 package designation?

A: The 0201 package (0603 metric) is a surface-mount resistor with dimensions of 0.024" L x 0.012" W (0.60mm x 0.30mm). All substitute parts use this identical package, ensuring mechanical compatibility with existing PCB layouts and assembly processes. The maximum seated height is 0.010" (0.26mm) for all parts except RMCF0201FT1R00, which is 0.011" (0.28mm).

Q: Can RC0603J1R0CS (1 Ohm) be used instead of the 1.2 Ohm original?

A: RC0603J1R0CS can be used only if circuit design analysis confirms that a 1 Ohm resistance value is acceptable. The 0.2 Ohm difference represents approximately 17% lower resistance. This substitution requires engineering verification that the circuit performance, voltage drop, power dissipation, and signal integrity remain within acceptable limits.

Q: What is the temperature coefficient, and why does it matter?

A: Temperature coefficient (ppm/°C) indicates how much the resistance value changes per degree Celsius. The original RK73B1HTTC1R2J and RMCF0201FT1R00 have ±400ppm/°C, while Samsung parts have ±300ppm/°C. Lower temperature coefficients provide better stability across temperature extremes. For applications operating across the full -55°C ~ 155°C range, the ±300ppm/°C Samsung parts may offer improved performance stability, though both ratings are within standard thick film resistor specifications.

Q: Is AEC-Q200 rating important for my application?

A: AEC-Q200 is the automotive electronics qualification standard. If your application is automotive or requires automotive-grade reliability, select parts with AEC-Q200 rating: RK73B1HTTC1R2J, RK73B1HTTCM1R2J, or RMCF0201FT1R00. Samsung RC series parts do not carry AEC-Q200 rating and are suitable for industrial and consumer applications only.