74F475AI-RC Equivalent & Substitute Parts

Part Overview

The 74F475AI-RC is a 47 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 350 mA with a maximum DC resistance of 4.6Ohm. This through-hole axial component operates across a temperature range of -55°C to 105°C and is ROHS3 compliant. The product is currently obsolete, making equivalent substitutes necessary for ongoing design requirements and component sourcing.

Key Parameters

Parameter	Value
Inductance	47 µH
Current Rating	350 mA
DC Resistance (DCR)	4.6Ohm Max
Tolerance	±10%
Core Type	Iron
Shielding	Unshielded
Mounting Type	Through Hole
Package	Axial
Operating Temperature	-55°C ~ 105°C

Substitute Part Grouping Explanation

The 1945R-16J from API Delevan Inc. qualifies as a substitute based on the following critical parameters:

Inductance value matches at 47 µH
Core material is iron, maintaining electromagnetic characteristics
Unshielded configuration matches the original design
Through-hole axial mounting is identical
Operating temperature range of -55°C to 125°C encompasses the original specification
ROHS3 compliance and REACH unaffected status align with regulatory requirements

The substitute differs in current rating (275 mA vs. 350 mA) and DC resistance (3.7Ohm vs. 4.6Ohm Max), requiring circuit-level evaluation for applications demanding the full 350 mA specification.

Parameter Comparison

Parameter	74F475AI-RC (Bourns)	1945R-16J (API Delevan)
Inductance	47 µH	47 µH
Tolerance	±10%	±5%
Current Rating (Amps)	350 mA	275 mA
DC Resistance (DCR)	4.6Ohm Max	3.7Ohm
Q @ Frequency	90 @ 2.52MHz	80 @ 2.5MHz
Frequency - Self Resonant	19MHz	17.6MHz
Core Material	Iron	Iron
Shielding	Unshielded	Unshielded
Operating Temperature	-55°C ~ 105°C	-55°C ~ 125°C
Mounting Type	Through Hole	Through Hole
Package / Case	Axial	Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 1945R-16J serves as a functional substitute for the obsolete 74F475AI-RC in applications where the 275 mA current rating is sufficient. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The 1945R-16J offers improved inductance tolerance (±5% vs. ±10%), which may benefit precision-dependent circuits. The extended operating temperature range to 125°C provides additional thermal margin. Selection should be based on circuit current requirements and thermal operating conditions specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 1945R-16J directly replace the 74F475AI-RC in all applications?

A: Direct replacement is valid for circuits operating at or below 275 mA. Applications requiring the full 350 mA rating of the original component require circuit redesign or alternative sourcing.

Q: What is the impact of the 0.2Ohm increase in DC resistance?

A: The 1945R-16J exhibits 3.7Ohm DCR compared to 4.6Ohm Max for the 74F475AI-RC. This 5.7% increase affects power dissipation and voltage drop characteristics. Thermal and voltage margin analysis is required for current-sensitive applications.

Q: Are the physical dimensions compatible?

A: The 1945R-16J measures 0.193" Dia x 0.447" L (4.90mm x 11.35mm), compared to the 74F475AI-RC at 0.200" Dia x 0.500" L (5.08mm x 12.70mm). Both are axial through-hole components with compatible PCB footprints, though the substitute is slightly smaller.

Q: Does the tolerance difference affect circuit performance?

A: The 1945R-16J provides tighter tolerance (±5%) versus the original (±10%), reducing inductance variation and improving circuit consistency in applications sensitive to inductance drift.

Q: What packaging options are available for the substitute?

A: The 1945R-16J is supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

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