Equivalent & Substitute Parts for RK73B1HTTC125G

Part Overview

The RK73B1HTTC125G is a 1.2 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 The part is currently classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line.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 ensures design continuity and maintains compliance with automotive reliability requirements for existing applications or legacy system support.

Substiute Parts

RK73B1HTTC125G

KOA Speer Electronics, Inc.In Stock: 685RK73B1HTTC125G Datasheet

Current PartRFQ

RK73B1HTTCM125G

KOA Speer Electronics, Inc.In Stock: 1160RK73B1HTTCM125G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73B1HTTC125G is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Non-negotiable):

• Resistance value: 1.2 MOhms
• Tolerance: ±2%
• Power rating: 0.05W minimum
• Temperature coefficient: ±200ppm/°C
• Operating temperature range: -55°C to 155°C minimum

Physical Parameters (Non-negotiable):

• Package type: 0201 (0603 metric)
• Composition: Thick film
• Number of terminations: 2

Compliance Parameters (Non-negotiable):

• Automotive rating: AEC-Q200
• RoHS status: ROHS3 Compliant

Substitute parts must demonstrate identical or superior performance across all parameters listed above. Variations in product status (Active vs. Not For New Designs) do not affect electrical or mechanical compatibility but indicate manufacturing lifecycle position.

Parameter Comparison

Engineering Selection Recommendations

The RK73B1HTTCM125G is the direct equivalent substitute for RK73B1HTTC125G. Both components are manufactured by KOA Speer Electronics within the RK73B series and share identical electrical, mechanical, and compliance specifications.

Selection Basis:

The substitute part RK73B1HTTCM125G demonstrates complete parameter equivalence with the main part across all critical dimensions: resistance value, tolerance, power rating, package geometry, temperature performance, and automotive qualification. The distinction between these parts lies solely in product lifecycle status—the main part is designated "Not For New Designs" while the substitute maintains "Active" status from the manufacturer.

For applications requiring the 1.2 MOhms ±2% 0.05W 0201 package resistor with AEC-Q200 automotive qualification, the RK73B1HTTCM125G provides full functional and physical compatibility. Both parts comply with ROHS3 environmental standards and maintain identical moisture sensitivity ratings.

The substitute part is recommended for procurement when the main part becomes unavailable or when transitioning to active product lines. No circuit redesign, PCB layout modification, or thermal analysis revision is required for this substitution.

Frequently Asked Questions (FAQ)

Q: Can RK73B1HTTCM125G be used as a direct replacement for RK73B1HTTC125G in automotive applications?

A: Yes. Both parts are electrically and mechanically identical with matching AEC-Q200 automotive ratings, identical resistance values (1.2 MOhms ±2%), power ratings (0.05W), package dimensions (0201), and operating temperature ranges (-55°C to 155°C). The substitute part is suitable for direct PCB substitution without circuit modification.

Q: What is the difference between these two part numbers?

A: The primary difference is product lifecycle status. RK73B1HTTC125G is classified as "Not For New Designs," indicating it has been superseded. RK73B1HTTCM125G maintains "Active" status in the manufacturer's current product portfolio. All electrical and mechanical specifications are identical.

Q: Are there any packaging differences between these parts?

A: No. Both parts use identical 0201 (0603 metric) package specifications with matching physical dimensions (0.024" L x 0.012" W / 0.60mm x 0.30mm) and maximum seated height (0.010" / 0.26mm). PCB footprints are interchangeable.

Q: Do both parts meet automotive compliance requirements?

A: Yes. Both RK73B1HTTC125G and RK73B1HTTCM125G carry AEC-Q200 automotive qualification ratings and are ROHS3 compliant. Both maintain REACH Unaffected status and identical moisture sensitivity levels (MSL 1 - Unlimited).

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

A: No. Both parts share identical temperature coefficient specifications (±200ppm/°C) and operating temperature ranges (-55°C to 155°C). Thermal performance and resistance stability characteristics are equivalent.

Q: Can I mix these parts in the same production batch?

A: Yes. Since all electrical, mechanical, and compliance parameters are identical, both parts can be used interchangeably within the same assembly without affecting circuit performance or reliability.