1025R-36K Fixed Inductor Equivalent & Substitute Parts

Part Overview

The 1025R-36K is a 4.7 µH unshielded molded inductor manufactured by API Delevan Inc., designed for through-hole axial mounting applications. This component operates across a temperature range of -55°C to 105°C with a maximum DC resistance of 1.2 Ohm and supports a current rating of 239 mA. The part is currently active in production and ROHS3 compliant.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the allowed specifications for this inductor category. Substitution becomes necessary due to inventory availability, supply chain considerations, or design flexibility requirements while maintaining functional equivalence.

Key Parameters

Parameter	Value	Unit
Inductance	4.7	µH
Inductance Tolerance	±10%	%
Current Rating	239	mA
DC Resistance (Max)	1.2	Ohm
Q Factor @ 7.9 MHz	45	-
Self Resonant Frequency	75	MHz
Operating Temperature Range	-55 to 105	°C
Mounting Type	Through Hole	-
Package Type	Axial	-
Physical Dimensions	0.095" Dia x 0.250" L (2.41mm x 6.35mm)	-
Shielding	Unshielded	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the 1025R-36K is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Inductance value: 4.7 µH with ±10% tolerance
DC Resistance: 1.2 Ohm maximum
Q Factor @ 7.9 MHz: 45
Self Resonant Frequency: 75 MHz
Mounting Type: Through Hole
Package Type: Axial
Physical Dimensions: 0.095" Dia x 0.250" L (2.41mm x 6.35mm)
Shielding Configuration: Unshielded

Allowable Variation Parameters:

Current Rating: Substitute parts must meet or exceed the 239 mA requirement
Operating Temperature Range: Substitute parts must cover the minimum range of -55°C to 105°C; extended ranges are acceptable
Core Material: Variation permitted (Iron or Ferrite) provided all electrical parameters are maintained

The 9230-36-RC from Bourns Inc. qualifies as a substitute based on matching all critical parameters while exceeding the current rating specification (320 mA vs. 239 mA) and extending the upper operating temperature limit to 125°C.

Parameter Comparison

Parameter	1025R-36K (API Delevan)	9230-36-RC (Bourns)	Match Status
Inductance	4.7 µH	4.7 µH	Matched
Inductance Tolerance	±10%	±10%	Matched
Current Rating	239 mA	320 mA	Substitute Exceeds
DC Resistance (Max)	1.2 Ohm	1.2 Ohm	Matched
Q @ 7.9 MHz	45	45	Matched
Self Resonant Frequency	75 MHz	75 MHz	Matched
Operating Temperature Range	-55°C to 105°C	-55°C to 125°C	Substitute Exceeds
Mounting Type	Through Hole	Through Hole	Matched
Package Type	Axial	Axial	Matched
Physical Dimensions	0.095" Dia x 0.250" L	0.095" Dia x 0.250" L	Matched
Shielding	Unshielded	Unshielded	Matched
Core Material	Iron	Ferrite	Variation Allowed
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched

Engineering Selection Recommendations

Both the 1025R-36K and 9230-36-RC are active production components with ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

The 1025R-36K (API Delevan) is the primary specification component with established design validation and 903 units in current inventory.

The 9230-36-RC (Bourns) serves as a qualified substitute with 845 units available. This substitute provides enhanced performance margins through higher current rating (320 mA vs. 239 mA) and extended upper operating temperature (125°C vs. 105°C). Selection between these parts should be based on inventory availability, lead time requirements, and design margin preferences, as all critical electrical and mechanical parameters are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the 9230-36-RC replace the 1025R-36K in existing designs?

A: Yes. The 9230-36-RC maintains all critical electrical parameters (inductance, DC resistance, Q factor, self-resonant frequency) and physical dimensions. The substitute provides equal or superior performance in current rating and temperature range.

Q: What is the difference in core material between these inductors?

A: The 1025R-36K uses an iron core while the 9230-36-RC uses a ferrite core. Both configurations deliver identical electrical performance at the specified test frequency of 7.9 MHz and maintain the same Q factor of 45.

Q: Are there any thermal performance differences?

A: The 9230-36-RC extends the upper operating temperature limit to 125°C compared to 105°C for the 1025R-36K. Both maintain the same lower temperature limit of -55°C. This provides additional thermal margin in the substitute part.

Q: Do these inductors have identical physical footprints?

A: Yes. Both parts share identical axial package dimensions of 0.095" diameter by 0.250" length (2.41mm x 6.35mm), ensuring direct mechanical compatibility in through-hole PCB applications.

Q: What is the current handling capability difference?

A: The 1025R-36K is rated for 239 mA while the 9230-36-RC is rated for 320 mA. The substitute provides 81 mA additional current capacity, offering design margin for applications requiring higher current handling.

Q: Are both parts compliant with current environmental standards?

A: Yes. Both the 1025R-36K and 9230-36-RC are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

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