RK73H1HTTC3900D Equivalent & Substitute Parts

Part Overview

The RK73H1HTTC3900D is a 390 Ohm ±0.5% thick film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.05W (1/20W) in a 0201 (0603 Metric) package. This component is designed for automotive applications and meets AEC-Q200 qualification standards with moisture-resistant construction.

The RK73H1HTTC3900D carries a product status of "Not For New Designs," indicating it has been superseded in the manufacturer's active product line. Identifying equivalent substitute parts is necessary for ongoing support of existing designs, legacy system maintenance, and procurement continuity when original inventory becomes unavailable.

Substiute Parts

RK73H1HTTC3900D

KOA Speer Electronics, Inc.In Stock: 1048RK73H1HTTC3900D Datasheet

Current PartRFQ

RK73H1HTTCM3900D

KOA Speer Electronics, Inc.In Stock: 1255RK73H1HTTCM3900D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RK73H1HTTC3900D is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Resistance value: 390 Ohms (exact match required)
• Tolerance: ±0.5% (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 / Case: 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 & Environmental Parameters:

• Automotive rating: AEC-Q200 (exact match required)
• Composition: Thick Film (exact match required)
• Moisture resistance: Required
• RoHS Status: ROHS3 Compliant (exact match required)
• Moisture Sensitivity Level: MSL 1 (Unlimited) (exact match required)

Parts meeting all these criteria are classified as direct electrical and mechanical equivalents suitable for substitution in applications originally designed for the RK73H1HTTC3900D.

Parameter Comparison

Engineering Selection Recommendations

The RK73H1HTTCM3900D is a direct equivalent substitute for the RK73H1HTTC3900D. Both components are manufactured by KOA Speer Electronics, Inc., within the RK73H series and share identical electrical, mechanical, and environmental specifications.

The primary distinction is product status: the original RK73H1HTTC3900D is designated "Not For New Designs," while the substitute RK73H1HTTCM3900D maintains "Active" status in the manufacturer's current product line. This status change reflects the manufacturer's ongoing support and availability assurance for the substitute part.

Both parts satisfy AEC-Q200 automotive qualification requirements, ROHS3 compliance, and MSL 1 moisture sensitivity classification. The substitute part is suitable for direct replacement in existing designs, legacy system repairs, and ongoing production support where the original part number is no longer procurable.

Frequently Asked Questions (FAQ)

Q: Can RK73H1HTTCM3900D be used as a direct replacement for RK73H1HTTC3900D?

A: Yes. The RK73H1HTTCM3900D is a direct electrical and mechanical equivalent. All critical parameters—resistance, tolerance, power rating, package dimensions, temperature range, and automotive certifications—are identical between the two parts.

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

A: The primary difference is product lifecycle status. The RK73H1HTTC3900D is classified as "Not For New Designs," indicating it has been superseded. The RK73H1HTTCM3900D carries "Active" status, meaning it is the current production equivalent with ongoing manufacturer support and availability.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the RK73H1HTTC3900D and RK73H1HTTCM3900D meet AEC-Q200 automotive qualification standards and are rated for the same operating temperature range (-55°C ~ 155°C). Both include moisture-resistant construction appropriate for automotive environments.

Q: Will the substitute part fit in the same PCB footprint?

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

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, carry MSL 1 (Unlimited) moisture sensitivity classification, and meet identical environmental and regulatory standards. The substitute part maintains full compliance equivalence.

Q: Which part should be specified for new procurement?

A: The RK73H1HTTCM3900D should be specified for new procurement and ongoing production support due to its "Active" product status. The original RK73H1HTTC3900D should be reserved for legacy system maintenance only when existing inventory is available.