Equivalent & Substitute Parts for RK73B1HTTC221G

Part Overview

The RK73B1HTTC221G is a 220 Ohm ±2% thick film chip resistor rated at 0.05W (1/20W) in 0201 package format, manufactured by KOA Speer Electronics, Inc. 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 The part is currently classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line.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 alternatives that meet identical electrical and mechanical specifications.

Substiute Parts

RK73B1HTTC221G

KOA Speer Electronics, Inc.In Stock: 1068RK73B1HTTC221G Datasheet

Current PartRFQ

RK73B1HTTCM221G

KOA Speer Electronics, Inc.In Stock: 708RK73B1HTTCM221G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RK73B1HTTC221G is determined by strict equivalence across the following critical parameters:

Electrical Specifications: Resistance value (220 Ohms), tolerance (±2%), and power rating (0.05W) must be identical. Temperature coefficient (±200ppm/°C) and operating temperature range (-55°C ~ 155°C) define thermal performance boundaries and must match exactly.

Mechanical Specifications: Package format (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) ensure PCB compatibility and assembly process compatibility.

Composition & Construction: Thick film construction type must be maintained to preserve electrical characteristics and reliability performance.

Compliance & Ratings: AEC-Q200 automotive qualification, RoHS3 compliance, and MSL 1 rating are mandatory for equivalent substitution in automotive applications.

Manufacturer Series: Parts within the KOA Speer RK73B series sharing identical specifications are considered direct equivalents.

Parameter Comparison

Engineering Selection Recommendations

The RK73B1HTTCM221G is the direct equivalent substitute for RK73B1HTTC221G. Both parts are manufactured by KOA Speer Electronics within the RK73B series and share identical electrical, mechanical, and compliance specifications. The primary distinction is product status: RK73B1HTTC221G is classified as "Not For New Designs," while RK73B1HTTCM221G maintains "Active" status in the manufacturer's current product portfolio.

For new designs and ongoing production, RK73B1HTTCM221G is the recommended selection. This substitution ensures continued access to qualified automotive-grade 220 Ohm resistors with AEC-Q200 certification, ROHS3 compliance, and identical performance characteristics. The substitute part maintains full compatibility with existing PCB layouts, assembly processes, and thermal management requirements.

For existing designs currently using RK73B1HTTC221G, transition to RK73B1HTTCM221G presents no technical risk, as all functional and mechanical parameters are equivalent. This substitution supports long-term supply chain stability and aligns with manufacturer product lifecycle management.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM221G be used as a direct replacement for RK73B1HTTC221G in existing assemblies?

A: Yes. Both parts are electrically and mechanically identical. The substitute part has identical resistance (220 Ohms ±2%), power rating (0.05W), package format (0201), temperature coefficient (±200ppm/°C), operating range (-55°C ~ 155°C), and AEC-Q200 automotive qualification. No circuit redesign or PCB modification is required.

Q: What is the significance of "Not For New Designs" status on RK73B1HTTC221G?

A: This designation indicates the part has been superseded by the manufacturer and is no longer recommended for new product development. RK73B1HTTCM221G is the active equivalent that should be used for all new designs to ensure long-term supply availability and manufacturer support.

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

A: Yes. Both parts have identical dimensions: 0.024" L x 0.012" W (0.60mm x 0.30mm) with maximum seated height of 0.010" (0.26mm). They are fully compatible with the same PCB footprints and assembly equipment.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both RK73B1HTTC221G and RK73B1HTTCM221G carry AEC-Q200 automotive qualification and are ROHS3 compliant with MSL 1 rating, making them suitable for automotive applications without additional qualification testing.

Q: Is there any difference in tolerance or temperature coefficient between these parts?

A: No. Both parts have identical tolerance (±2%) and temperature coefficient (±200ppm/°C), ensuring equivalent performance across the full operating temperature range of -55°C to 155°C.