RK73B1HTTC435J Equivalent & Substitute Parts

Part Overview

The RK73B1HTTC435J is a 4.3 MOhms ±5% thick film chip resistor manufactured by KOA Speer Electronics, Inc., rated for 0.05W (1/20W) power dissipation in a 0201 (0603 Metric) package. This component is designed for automotive applications and meets AEC-Q200 qualification standards. The part is currently classified as "Not For New Designs," which necessitates identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for ongoing production and maintenance applications.

Substiute Parts

RK73B1HTTC435J

KOA Speer Electronics, Inc.In Stock: 817RK73B1HTTC435J Datasheet

Current PartRFQ

RK73B1HTTCM435J

KOA Speer Electronics, Inc.In Stock: 1080RK73B1HTTCM435J Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RK73B1HTTC435J is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Resistance value: 4.3 MOhms (exact match required)
• Tolerance: ±5% (exact match required)
• Power rating: 0.05W / 1/20W (exact match required)
• Temperature coefficient: ±200ppm/°C (exact match required)
• Operating temperature range: -55°C ~ 155°C (exact match required)

Mechanical Parameters:

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

Compliance & Quality Parameters:

• Automotive qualification: AEC-Q200 (exact match required)
• RoHS compliance: ROHS3 Compliant (exact match required)
• Moisture sensitivity: MSL 1 (Unlimited) (exact match required)

Substitute parts must satisfy all parameters listed above without deviation. Composition (Thick Film) and manufacturer (KOA Speer Electronics, Inc.) remain consistent across the RK73B series.

Parameter Comparison

Engineering Selection Recommendations

The RK73B1HTTCM435J is the direct equivalent substitute for the RK73B1HTTC435J. Both components are manufactured by KOA Speer Electronics, Inc., within the RK73B series and satisfy identical electrical, mechanical, and compliance specifications.

Primary Advantage of Substitution: The RK73B1HTTCM435J maintains "Active" product status, whereas the RK73B1HTTC435J is classified as "Not For New Designs." This distinction is critical for long-term supply chain continuity and component availability. The substitute part ensures access to current manufacturing batches and ongoing supplier support.

Compliance Verification: Both parts are AEC-Q200 qualified for automotive applications, ROHS3 compliant, and REACH unaffected. Moisture sensitivity level (MSL 1) indicates unlimited shelf life under standard storage conditions. These certifications remain unchanged in the substitute part.

Interchangeability: The RK73B1HTTCM435J is a direct pin-for-pin and form-factor equivalent. No circuit modifications, PCB layout adjustments, or design changes are required for substitution. The part may be used as a direct replacement in existing designs and new production runs.

Frequently Asked Questions (FAQ)

Q: Can the RK73B1HTTCM435J be used as a direct replacement for the RK73B1HTTC435J in existing designs?

A: Yes. The RK73B1HTTCM435J is electrically and mechanically identical to the RK73B1HTTC435J. All electrical parameters (resistance, tolerance, power rating, temperature coefficient, operating temperature range) and mechanical specifications (0201 package, dimensions, terminations) are equivalent. No design modifications are required.

Q: What is the difference between the RK73B1HTTC435J and RK73B1HTTCM435J part numbers?

A: The part numbers differ only in the manufacturing variant designation within the KOA Speer RK73B series. The "M" designation in RK73B1HTTCM435J indicates a current production variant. Both parts are functionally and physically identical with matching specifications.

Q: Why is the RK73B1HTTC435J marked as "Not For New Designs"?

A: This designation indicates that the part has been superseded in KOA Speer's product line. The RK73B1HTTCM435J is the active equivalent. For new designs and ongoing production, the RK73B1HTTCM435J should be specified to ensure long-term component availability and manufacturer support.

Q: Are there any differences in AEC-Q200 compliance between these parts?

A: No. Both the RK73B1HTTC435J and RK73B1HTTCM435J are AEC-Q200 qualified. Automotive reliability and qualification standards are identical across both parts.

Q: Can these parts be used interchangeably in automotive applications?

A: Yes. Both parts meet AEC-Q200 automotive qualification standards and are suitable for automotive circuit applications. The operating temperature range (-55°C ~ 155°C) and reliability ratings are equivalent.

Q: What is the moisture sensitivity level (MSL) for these resistors?

A: Both parts have MSL 1 (Unlimited), indicating unlimited shelf life under standard storage conditions. No special moisture control measures are required during storage or handling.

Q: Are there any RoHS or REACH compliance differences?

A: No. Both parts are ROHS3 compliant and REACH unaffected. Environmental and regulatory compliance is identical.

Q: What is the physical package size for these 0201 resistors?

A: The 0201 (0603 Metric) package has dimensions of 0.024" L x 0.012" W (0.60mm x 0.30mm) with a maximum seated height of 0.010" (0.26mm). This specification is identical for both parts.