Equivalent & Substitute Parts for RK73B1HTTC3R3J

Part Overview

The RK73B1HTTC3R3J is a 3.3 Ohm, ±5% tolerance, 0.05W (1/20W) 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temperature range of -55°C to 155°C. The part is currently classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. 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 specifications.

Substiute Parts

RK73B1HTTC3R3J

KOA Speer Electronics, Inc.In Stock: 13566RK73B1HTTC3R3J Datasheet

Current PartRFQ

RK73B1HTTCM3R3J

KOA Speer Electronics, Inc.In Stock: 746RK73B1HTTCM3R3J Datasheet

MFR RecommendedRFQ

RMCF0201JT3R30

Stackpole Electronics IncIn Stock: 805RMCF0201JT3R30 Datasheet

DirectRFQ

RC0603J3R0CS

Samsung Electro-MechanicsIn Stock: 736RC0603J3R0CS Datasheet

UpgradeRFQ

RC0603J3R3CS

Samsung Electro-MechanicsIn Stock: 779RC0603J3R3CS Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73B1HTTC3R3J is determined by the following critical parameters:

Primary Substitution Criteria:

• Resistance value: 3.3 Ohms (exact match required for direct substitution)
• Tolerance: ±5% (electrical performance equivalence)
• Power rating: 0.05W, 1/20W (thermal handling capability)
• Package: 0201 (0603 Metric) (physical and mechanical compatibility)
• Composition: Thick Film (manufacturing process compatibility)

Secondary Compatibility Factors:

• Temperature coefficient within acceptable range (±400ppm/°C or better)
• Operating temperature range: minimum -55°C to 155°C coverage
• RoHS3 compliance (regulatory requirement)
• MSL rating 1 (storage and handling compatibility)

The substitute parts are grouped into three categories based on product status and manufacturer:

1. MFR Recommended Equivalent: RK73B1HTTCM3R3J (KOA Speer Electronics, Inc.) — Active product from original manufacturer
2. Direct Manufacturer Substitute: RMCF0201JT3R30 (Stackpole Electronics Inc) — Active product with identical electrical specifications
3. Upgrade Alternatives: RC0603J3R0CS and RC0603J3R3CS (Samsung Electro-Mechanics) — Active products with enhanced moisture resistance features

Parameter Comparison

Engineering Selection Recommendations

For Existing Designs (Maintenance and Repair):

The RK73B1HTTCM3R3J is the primary recommended substitute. As an active product from the original manufacturer KOA Speer Electronics, Inc., it maintains identical electrical specifications, temperature coefficient, full operating temperature range (-55°C to 155°C), and AEC-Q200 automotive rating. This part provides direct compatibility with existing designs without performance degradation.

For Active Production and New Designs:

The RMCF0201JT3R30 from Stackpole Electronics Inc is a qualified alternative. It meets all critical electrical parameters (3.3 Ohms, ±5%, 0.05W) and maintains the same temperature coefficient and operating range. The part carries AEC-Q200 certification and ROHS3 compliance. The maximum seated height is 0.011" (0.28mm) compared to 0.010" (0.26mm) for the main part; this difference is within typical PCB assembly tolerances for 0201 packages.

For Applications Requiring Enhanced Moisture Resistance:

The RC0603J3R3CS from Samsung Electro-Mechanics provides an upgrade path with identical resistance value (3.3 Ohms) and tolerance (±5%). This part features moisture-resistant composition and an improved temperature coefficient of ±300ppm/°C. However, the maximum operating temperature is limited to 125°C (versus 155°C for the main part), and automotive AEC-Q200 rating is not specified. This substitute is suitable only for applications where the 125°C upper temperature limit is acceptable.

The RC0603J3R0CS (3 Ohms) is not recommended as a direct substitute due to resistance value mismatch, despite identical package and power rating specifications.

Frequently Asked Questions (FAQ)

Q: Can I use RK73B1HTTCM3R3J as a direct replacement for RK73B1HTTC3R3J?

A: Yes. The RK73B1HTTCM3R3J is the manufacturer-recommended equivalent. Both parts share identical electrical specifications (3.3 Ohms, ±5%, 0.05W), temperature coefficient (±400ppm/°C), operating temperature range (-55°C to 155°C), package (0201), and AEC-Q200 automotive rating. The primary difference is product status: the original is "Not For New Designs" while the equivalent is "Active."

Q: What is the difference between RMCF0201JT3R30 and RK73B1HTTC3R3J?

A: Both parts are electrically equivalent with 3.3 Ohms resistance, ±5% tolerance, 0.05W power rating, and ±400ppm/°C temperature coefficient. The RMCF0201JT3R30 is manufactured by Stackpole Electronics Inc instead of KOA Speer Electronics, Inc. The seated height specification differs slightly: 0.011" (0.28mm) maximum for RMCF versus 0.010" (0.26mm) for RK73B. This 0.001" difference is within standard PCB assembly tolerances for 0201 components and does not affect functionality or compatibility.

Q: Why do the Samsung RC0603J3R3CS and RC0603J3R0CS have different operating temperature limits?

A: Both Samsung parts are specified with a maximum operating temperature of 125°C, compared to 155°C for the KOA and Stackpole parts. This is a manufacturer specification difference and reflects the design characteristics of Samsung's moisture-resistant thick film composition. Applications requiring operation above 125°C must use KOA or Stackpole alternatives.

Q: Can I substitute RC0603J3R0CS (3 Ohms) for the 3.3 Ohm main part?

A: No. Resistance value is a critical electrical parameter. The RC0603J3R0CS is rated at 3 Ohms, not 3.3 Ohms. Although both parts share the same package, tolerance, power rating, and composition, the 0.3 Ohm difference represents a 9% deviation from the specified value and will alter circuit performance. Use RC0603J3R3CS (3.3 Ohms) if Samsung components are required.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (RK73B1HTTCM3R3J, RMCF0201JT3R30, RC0603J3R0CS, and RC0603J3R3CS) are ROHS3 compliant and meet current regulatory requirements for hazardous substance restrictions.

Q: What does "Not For New Designs" mean for the RK73B1HTTC3R3J?

A: This designation indicates that KOA Speer Electronics, Inc. has superseded this part number in their active product portfolio. While existing inventory remains available, the manufacturer recommends using the active equivalent RK73B1HTTCM3R3J for new designs. The original part remains functionally valid for maintenance, repair, and existing production runs.

Q: Do all substitute parts have the same moisture sensitivity level?

A: Yes. All parts listed (main and substitutes) carry MSL rating 1 (Unlimited), indicating they have unlimited shelf life and require no special moisture control during storage or handling.