ROX3SF44K2 Equivalent & Substitute Parts

Part Overview

The ROX3SF44K2 is a 44.2 kOhms ±1% 3W through-hole resistor manufactured by TE Connectivity Passive Product. This axial metal oxide film resistor features flame-proof and pulse-withstanding characteristics, designed for applications requiring high reliability and safety compliance. The product is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain the same electrical and mechanical specifications for continued system support and new designs.

Substiute Parts

ROX3SF44K2

TE Connectivity Passive ProductIn Stock: 1183ROX3SF44K2 Datasheet

Current PartRFQ

FMP300FTF73-44K2

YAGEOIn Stock: 783FMP300FTF73-44K2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX3SF44K2 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 44.2 kOhms
• Tolerance: ±1%
• Power rating: 3W
• Package configuration: Axial through-hole
• Number of terminations: 2
• Safety features: Flame proof and safety compliance

Acceptable Variation Parameters:

• Composition: Metal oxide film (original) to metal film (substitute) — both compositions satisfy the 44.2 kOhms ±1% 3W specification
• Temperature coefficient: ±350ppm/°C to ±100ppm/°C — substitute exhibits superior temperature stability
• Operating temperature range: -55°C to 200°C (original) to -55°C to 155°C (substitute) — substitute range remains suitable for standard industrial applications

The FMP300FTF73-44K2 meets all mandatory parameters and provides equivalent electrical performance with enhanced temperature coefficient characteristics.

Parameter Comparison

Engineering Selection Recommendations

The FMP300FTF73-44K2 manufactured by YAGEO is a direct functional equivalent to the obsolete ROX3SF44K2. Selection of this substitute is supported by the following engineering criteria:

Electrical Equivalence: Both resistors provide identical resistance (44.2 kOhms), tolerance (±1%), and power rating (3W), ensuring drop-in compatibility in circuit applications.

Mechanical Compatibility: Both components feature axial through-hole packaging with two terminations. Dimensional differences (5.50mm to 5.00mm diameter; 16.00mm to 15.50mm length) are within acceptable tolerances for standard PCB layouts and do not require design modification.

Compliance Status: The YAGEO FMP300FTF73-44K2 holds active product status with ROHS3 compliance and REACH unaffected designation, ensuring regulatory compliance for current manufacturing and procurement requirements.

Performance Enhancement: The substitute exhibits superior temperature coefficient (±100ppm/°C versus ±350ppm/°C), providing improved stability across temperature variations. The operating temperature range of -55°C to 155°C covers standard industrial and commercial applications.

Availability: The FMP300FTF73-44K2 is currently in active production with confirmed inventory, eliminating supply chain risk associated with the obsolete ROX3SF44K2.

Frequently Asked Questions (FAQ)

Q: Can the FMP300FTF73-44K2 be used as a direct replacement for the ROX3SF44K2 in existing designs?

A: Yes. Both resistors meet the core electrical specifications (44.2 kOhms ±1% 3W) and share identical axial through-hole packaging with two terminations. The dimensional variation is minor and does not require PCB redesign.

Q: What is the difference between metal oxide film and metal film composition?

A: Both compositions satisfy the specified 44.2 kOhms ±1% 3W rating. Metal film composition in the substitute provides a superior temperature coefficient (±100ppm/°C versus ±350ppm/°C), resulting in better frequency stability and lower noise characteristics.

Q: Does the lower maximum operating temperature of the substitute (155°C versus 200°C) affect compatibility?

A: For standard industrial and commercial applications operating within -55°C to 155°C, the substitute is fully compatible. Applications requiring sustained operation above 155°C require evaluation against specific thermal requirements.

Q: Are there any compliance or certification differences between the two parts?

A: The substitute (FMP300FTF73-44K2) carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. Both components are designated EAR99 for export control purposes.

Q: What is the physical size difference, and does it matter for PCB layout?

A: The substitute is slightly smaller (5.00mm diameter and 15.50mm length versus 5.50mm and 16.00mm). This difference is negligible for standard through-hole PCB designs and does not require layout modification.

Q: Is the FMP300FTF73-44K2 available in the same packaging format?

A: The substitute is supplied in Tape & Box (TB) packaging, suitable for automated assembly and manual component selection. The ROX3SF44K2 packaging format is not specified in available documentation.