MOS2CT52A390J Equivalent & Substitute Parts

Part Overview

The MOS2CT52A390J is a 39 Ohms ±5% 2W through hole resistor manufactured by KOA Speer Electronics, Inc. This axial metal oxide film resistor features flame proof and safety characteristics, designed for applications requiring reliable power dissipation in the 2W range. The part is currently active in production with 813 pieces in stock. Alternative equivalent and substitute parts are available to support procurement flexibility, design redundancy, and supply chain continuity.

Key Parameters

Parameter	Value
Resistance	39 Ohms
Tolerance	±5%
Power Rating	2W
Composition	Metal Oxide Film
Package Type	Axial
Operating Temperature Range	-55°C ~ 200°C
Temperature Coefficient	±300ppm/°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MOS2CT52A390J is determined by strict equivalence across the following critical parameters:

Resistance value: 39 Ohms
Tolerance: ±5%
Power rating: 2W
Composition: Metal Oxide Film
Package: Axial through hole
Operating temperature range: -55°C ~ 200°C minimum
RoHS compliance: ROHS3 Compliant

Parts meeting all these criteria are classified as parametric equivalents or similar alternatives. Variations in physical dimensions, temperature coefficient, or specific safety features (flame proof vs. flame retardant) do not disqualify substitution when the core electrical and thermal specifications remain within acceptable limits for the application.

Parameter Comparison

Parameter	MOS2CT52A390J	MOS2CT52R390J	ROX2SJ39R
Manufacturer	KOA Speer Electronics, Inc.	KOA Speer Electronics, Inc.	TE Connectivity Passive Product
Resistance	39 Ohms	39 Ohms	39 Ohms
Tolerance	±5%	±5%	±5%
Power Rating	2W	2W	2W
Composition	Metal Oxide Film	Metal Oxide Film	Metal Oxide Film
Package	Axial	Axial	Axial
Operating Temperature	-55°C ~ 200°C	-55°C ~ 200°C	-55°C ~ 200°C
Temperature Coefficient	±300ppm/°C	±300ppm/°C	±350ppm/°C
Size / Dimension	0.157" Dia x 0.472" L (4.00mm x 12.00mm)	0.157" Dia x 0.472" L (4.00mm x 12.00mm)	0.197" Dia x 0.472" L (5.00mm x 12.00mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Inventory Availability	813 Pcs	2499 Pcs	3723 Pcs

Engineering Selection Recommendations

All three parts listed meet the core electrical and thermal specifications required for 39 Ohm 2W axial metal oxide film resistor applications. Selection should be based on the following factors:

MOS2CT52A390J (Primary Part): Use when original part specification is required or when flame proof characteristics are mandatory. Active production status and ROHS3 compliance confirmed.

MOS2CT52R390J (Parametric Equivalent): Direct electrical equivalent from the same manufacturer with identical resistance, tolerance, power rating, and temperature range. Differs only in flame retardant coating specification rather than flame proof. Higher inventory availability (2499 pcs) supports procurement efficiency. Recommended as primary substitute when flame retardant coating is acceptable.

ROX2SJ39R (Similar Alternative): Meets all critical electrical parameters with pulse withstanding capability. Manufactured by TE Connectivity. Physical diameter is 0.197" (5.00mm) compared to 4.00mm for KOA parts, requiring PCB layout verification. Temperature coefficient is ±350ppm/°C versus ±300ppm/°C. Highest inventory availability (3723 pcs). Suitable when mechanical footprint accommodation is possible.

All parts carry ROHS3 compliance and are rated for -55°C to 200°C operation, supporting equivalent functional performance in compliant applications.

Frequently Asked Questions (FAQ)

Q: Can MOS2CT52R390J be used as a direct replacement for MOS2CT52A390J?

A: Yes. Both parts are manufactured by KOA Speer Electronics with identical electrical specifications: 39 Ohms ±5% at 2W power rating, metal oxide film composition, and -55°C to 200°C operating range. The primary difference is the safety feature designation (flame proof vs. flame retardant coating). Substitution is valid when the application does not specifically require flame proof certification.

Q: What is the main difference between the KOA parts and the TE Connectivity ROX2SJ39R?

A: Electrical performance is equivalent across resistance, tolerance, power rating, and operating temperature. Physical dimensions differ: ROX2SJ39R has a 0.197" (5.00mm) diameter versus 4.00mm for KOA parts. Temperature coefficient is ±350ppm/°C for ROX2SJ39R versus ±300ppm/°C for KOA parts. ROX2SJ39R includes pulse withstanding capability. PCB layout must accommodate the larger diameter before substitution.

Q: Are all three parts RoHS compliant?

A: Yes. MOS2CT52A390J, MOS2CT52R390J, and ROX2SJ39R are all ROHS3 compliant, meeting regulatory requirements for restricted substance elimination.

Q: Which part should I select for highest inventory availability?

A: ROX2SJ39R offers the highest stock level at 3723 pieces. MOS2CT52R390J provides 2499 pieces. MOS2CT52A390J has 813 pieces available. Selection should balance availability with mechanical and safety feature requirements.

Q: Can ROX2SJ39R be used in applications with tight PCB space constraints?

A: No. The ROX2SJ39R has a larger axial diameter (5.00mm) compared to the KOA parts (4.00mm). Applications with restricted component spacing must use MOS2CT52A390J or MOS2CT52R390J to maintain design compatibility.

Q: What is the significance of the temperature coefficient difference?

A: MOS2CT52A390J and MOS2CT52R390J have ±300ppm/°C temperature coefficient, while ROX2SJ39R has ±350ppm/°C. Both are within acceptable ranges for general resistor applications. Applications requiring tighter temperature stability should prioritize the KOA parts with the lower coefficient.

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