RK73B1HTTC180G Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC180G is an 18 Ohm ±2% thick film chip resistor manufactured by KOA Speer Electronics, Inc., rated for 0.05W (1/20W) power dissipation in a 0201 (0603 Metric) surface mount package. This component is designed for automotive applications and meets AEC-Q200 qualification standards. The part is currently classified as Not For New Designs, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for ongoing production and maintenance applications.

Substiute Parts

RK73B1HTTC180G

KOA Speer Electronics, Inc.In Stock: 801RK73B1HTTC180G Datasheet

Current PartRFQ

RK73B1HTTCM180G

KOA Speer Electronics, Inc.In Stock: 804RK73B1HTTCM180G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73B1HTTC180G is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Resistance value (18 Ohms), tolerance (±2%), power rating (0.05W), and temperature coefficient (±200ppm/°C) must be identical. Operating temperature range must encompass or equal -55°C to +155°C.

Mechanical Parameters: Package designation (0201/0603 Metric), physical dimensions (0.024" L x 0.012" W / 0.60mm x 0.30mm), and seated height (0.010" / 0.26mm maximum) must match exactly.

Compliance Parameters: AEC-Q200 automotive qualification, ROHS3 compliance, and MSL 1 rating are mandatory for substitution in automotive applications.

Composition: Thick film construction is required to maintain performance characteristics.

Substitute parts must originate from the same manufacturer series (RK73B) to ensure process consistency and reliability equivalence.

Parameter Comparison

Engineering Selection Recommendations

The RK73B1HTTCM180G is the direct equivalent substitute for the RK73B1HTTC180G. Both components are manufactured by KOA Speer Electronics, Inc., within the RK73B series and demonstrate complete electrical, mechanical, and compliance parameter equivalence.

The primary distinction is product lifecycle status: the original part (RK73B1HTTC180G) is designated Not For New Designs, while the substitute (RK73B1HTTCM180G) maintains Active product status. This status change reflects manufacturing continuity and ongoing availability assurance.

Both parts satisfy AEC-Q200 automotive qualification requirements, ROHS3 environmental compliance, and MSL 1 moisture sensitivity classification. Substitution is appropriate for automotive circuit applications requiring 18 Ohm resistive elements with ±2% tolerance and 0.05W power handling in 0201 package form factor.

No electrical performance degradation or functional compromise results from this substitution. Component selection between these parts should be based on current procurement availability and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM180G be used as a direct replacement for RK73B1HTTC180G in automotive applications?

A: Yes. Both parts are electrically and mechanically identical with matching AEC-Q200 automotive qualifications. The substitute maintains all specified parameters including 18 Ohm resistance, ±2% tolerance, 0.05W power rating, and -55°C to +155°C operating range.

Q: What is the significance of the product status change from "Not For New Designs" to "Active"?

A: Product status reflects manufacturing lifecycle. The original part is no longer recommended for new design implementations. The substitute's Active status indicates current production availability and manufacturer support for ongoing applications and maintenance requirements.

Q: Are the physical dimensions and package specifications identical?

A: Yes. Both parts use 0201 (0603 Metric) package designation with identical dimensions of 0.024" L x 0.012" W (0.60mm x 0.30mm) and maximum seated height of 0.010" (0.26mm). No PCB layout or assembly process modifications are required.

Q: Do both parts meet the same compliance and certification standards?

A: Yes. Both RK73B1HTTC180G and RK73B1HTTCM180G are ROHS3 compliant, REACH unaffected, and AEC-Q200 qualified. Moisture sensitivity level is MSL 1 (Unlimited) for both parts.

Q: Is there any difference in temperature coefficient or operating temperature range?

A: No. Both parts specify ±200ppm/°C temperature coefficient and -55°C to +155°C operating temperature range. Thermal performance characteristics are identical.

Q: What is the composition difference, if any?

A: No difference exists. Both parts are thick film chip resistors with identical construction and material composition.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. Complete electrical and mechanical equivalence permits direct substitution without design modification, circuit re-analysis, or performance re-qualification.