74F395AI-RC Equivalent & Substitute Parts

Part Overview

The 74F395AI-RC is a 39 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 400 mA with a maximum DC resistance of 2.6Ohm. This component is designed for through-hole axial mounting applications requiring fixed inductance in the microhenry range. The part is currently obsolete, making equivalent substitutes necessary for ongoing production, maintenance, and repair applications. Identifying compatible alternatives ensures design continuity while maintaining electrical and mechanical performance requirements.

Substiute Parts

74F395AI-RC

Bourns Inc.In Stock: 74674F395AI-RC Datasheet

Current PartRFQ

1945R-15J

API Delevan Inc.In Stock: 11191945R-15J Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F395AI-RC is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 39 µH (exact match required)
• Core material: Iron (maintains magnetic properties)
• Shielding configuration: Unshielded (electrical environment compatibility)
• Mounting type: Through hole axial (PCB layout compatibility)
• Package/case: Axial (mechanical fit)

Secondary Compatibility Factors:

• Current rating: Substitute must meet or exceed 400 mA requirement
• DC resistance: Lower or equal values preferred to minimize power loss
• Operating temperature range: Must cover or exceed -55°C ~ 105°C
• Compliance certifications: ROHS3 and REACH status alignment

The 1945R-15J from API Delevan Inc. qualifies as a substitute based on matching inductance (39 µH), core material (iron), shielding (unshielded), and axial through-hole configuration. Electrical parameter variations exist and must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 1945R-15J serves as an active substitute for the obsolete 74F395AI-RC. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and legacy system replacements.

Critical Considerations:

The 1945R-15J exhibits a reduced current rating (290 mA versus 400 mA). Applications requiring the full 400 mA capacity of the original part cannot use this substitute without circuit redesign or parallel configuration analysis.

The 1945R-15J demonstrates higher DC resistance (3.32Ohm versus 2.6Ohm Max), resulting in increased power dissipation. Thermal management and efficiency calculations must account for this 27.7% increase in resistance.

The 1945R-15J provides superior inductance tolerance (±5% versus ±10%), offering tighter specification control for precision applications.

Physical dimensions differ slightly (0.193" Dia x 0.447" L versus 0.200" Dia x 0.500" L). PCB layout verification is required to confirm mechanical fit within existing footprints.

The 1945R-15J extends the operating temperature range to -55°C ~ 125°C, providing additional thermal margin compared to the original -55°C ~ 105°C specification.

Frequently Asked Questions (FAQ)

Q: Can the 1945R-15J directly replace the 74F395AI-RC in all applications?

A: Direct replacement is possible only when circuit current requirements do not exceed 290 mA. The original part supports 400 mA; the substitute is rated for 290 mA. Applications operating at or near the original 400 mA specification require circuit analysis before substitution.

Q: How does the increased DC resistance affect circuit performance?

A: The 1945R-15J exhibits 3.32Ohm DC resistance compared to the 74F395AI-RC maximum of 2.6Ohm. This 27.7% increase generates additional resistive losses, manifesting as increased heat dissipation and potential voltage drop across the inductor. Power budget calculations must be updated accordingly.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: The 1945R-15J measures 0.193" Dia x 0.447" L, while the original measures 0.200" Dia x 0.500" L. The substitute is slightly smaller in both diameter and length. Mechanical fit verification is required, though the smaller dimensions typically present no clearance issues. Confirm lead spacing and hole positioning match the PCB design.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the 74F395AI-RC and 1945R-15J are ROHS3 compliant and REACH unaffected, ensuring equivalent regulatory status for applications subject to these standards.

Q: What is the significance of the inductance tolerance difference?

A: The 74F395AI-RC carries ±10% tolerance, while the 1945R-15J offers ±5% tolerance. The substitute provides tighter inductance specification control, beneficial for applications requiring precise inductance values. This represents an improvement over the original part specification.

Q: Can the extended operating temperature range of the 1945R-15J be relied upon?

A: The 1945R-15J supports -55°C ~ 125°C versus the original -55°C ~ 105°C. The extended upper temperature limit provides additional thermal margin. However, circuit design must still respect the original thermal requirements; the extended range does not permit operation beyond the system's designed thermal envelope.