RK73B1HTTC185G Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC185G is a 1.8 MOhms ±2% thick film chip resistor in 0201 package (0603 metric) rated for 0.05W power dissipation. This component is designed for automotive applications and meets AEC-Q200 qualification standards. The part is currently classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and transition to active product status alternatives where applicable.

Substiute Parts

RK73B1HTTC185G

KOA Speer Electronics, Inc.In Stock: 778RK73B1HTTC185G Datasheet

Current PartRFQ

RK73B1HTTCM185G

KOA Speer Electronics, Inc.In Stock: 950RK73B1HTTCM185G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73B1HTTC185G is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match Exactly):

• Resistance value: 1.8 MOhms
• Tolerance: ±2%
• Power rating: 0.05W (1/20W)
• Temperature coefficient: ±200ppm/°C

Mechanical Parameters (Must Match Exactly):

• Package / Case: 0201 (0603 Metric)
• Physical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm)
• Height - Seated (Max): 0.010" (0.26mm)
• Number of terminations: 2

Compliance & Environmental Parameters (Must Match or Exceed):

• Automotive rating: AEC-Q200
• Operating temperature range: -55°C ~ 155°C minimum
• RoHS status: ROHS3 Compliant
• Moisture sensitivity: MSL 1 or better

Substitute parts must maintain identical electrical and mechanical specifications to ensure direct board-level compatibility without design modification or re-qualification.

Parameter Comparison

Engineering Selection Recommendations

RK73B1HTTCM185G is the direct equivalent substitute for RK73B1HTTC185G. Both parts are manufactured by KOA Speer Electronics, Inc., belong to the RK73B series, and maintain identical electrical, mechanical, and environmental specifications.

The primary distinction is product status: RK73B1HTTC185G is classified as "Not For New Designs," while RK73B1HTTCM185G carries "Active" status. This indicates RK73B1HTTCM185G is the current production alternative and is recommended for new design implementations and ongoing supply requirements.

Both parts satisfy automotive AEC-Q200 qualification, ROHS3 compliance, and unlimited moisture sensitivity rating (MSL 1). The electrical performance, including 1.8 MOhms resistance at ±2% tolerance, ±200ppm/°C temperature coefficient, and 0.05W power rating, is identical across both parts. Mechanical compatibility is assured through identical 0201 package dimensions and termination configuration.

Selection of RK73B1HTTCM185G over RK73B1HTTC185G is appropriate for applications requiring active product status and long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM185G be used as a direct replacement for RK73B1HTTC185G on existing PCBs?

A: Yes. Both parts are electrically and mechanically identical. The RK73B1HTTCM185G can be substituted directly without PCB modification, design re-qualification, or performance impact. No design changes are required.

Q: What is the difference between RK73B1HTTC185G and RK73B1HTTCM185G?

A: The parts are functionally equivalent. The primary difference is product lifecycle status: RK73B1HTTC185G is "Not For New Designs," while RK73B1HTTCM185G is "Active." Both maintain identical 1.8 MOhms ±2% resistance, 0.05W power rating, 0201 package, AEC-Q200 automotive qualification, and ROHS3 compliance.

Q: Are both parts suitable for automotive applications?

A: Yes. Both RK73B1HTTC185G and RK73B1HTTCM185G carry AEC-Q200 qualification and are rated for automotive use across the -55°C to 155°C operating temperature range.

Q: What is the packaging difference between these parts?

A: There is no packaging difference. Both parts are supplied in 0201 (0603 metric) package with identical physical dimensions of 0.024" L x 0.012" W (0.60mm x 0.30mm) and maximum seated height of 0.010" (0.26mm).

Q: Which part should be specified for new designs?

A: RK73B1HTTCM185G should be specified for new designs. This part carries "Active" product status, ensuring long-term availability and manufacturer support. RK73B1HTTC185G is designated "Not For New Designs" and should not be selected for new applications.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical AEC-Q200 automotive qualification. Moisture sensitivity level is MSL 1 (unlimited) for both parts.

Q: Can these parts be used interchangeably in high-reliability applications?

A: Yes. Both parts meet identical electrical specifications, mechanical tolerances, and automotive compliance standards. They are fully interchangeable for high-reliability applications requiring AEC-Q200 qualification.