3225R-103K Equivalent & Substitute Parts

Part Overview

The 3225R-103K is a 10 µH unshielded ferrite core inductor manufactured by API Delevan Inc., rated for 297 mA continuous current with a maximum DC resistance of 2.1 Ohm. This surface mount component is housed in a 1210 (3225 Metric) package and operates across the temperature range of -55°C to 125°C.

The 3225R-103K carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for systems utilizing this inductor specification.

Key Parameters

Parameter	Value
Inductance	10 µH
Inductance Tolerance	±10%
Current Rating	297 mA
DC Resistance (Max)	2.1 Ohm
Core Material	Ferrite
Shielding	Unshielded
Operating Temperature Range	-55°C to 125°C
Q Factor @ 7.9 MHz	25
Self Resonant Frequency	30 MHz
Mounting Type	Surface Mount
Package / Case	1210 (3225 Metric)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 3225R-103K is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Inductance value: 10 µH ±10%
Current rating: 297 mA minimum
DC resistance: 2.1 Ohm maximum
Core material: Ferrite
Shielding configuration: Unshielded
Operating temperature range: -55°C to 125°C minimum
Self resonant frequency: 30 MHz

Mechanical Equivalence Criteria:

Mounting type: Surface Mount
Package classification: Compatible with 1210 or equivalent footprint dimensions
Physical dimensions: Within tolerance of 3.20mm L × 2.40mm W × 2.40mm H (seated)

Compliance Equivalence:

RoHS3 compliance required
Moisture sensitivity level: 1 (Unlimited)

The 1210R-103K meets all electrical specifications and compliance requirements. Physical dimensions show minor variations within acceptable tolerances for PCB footprint compatibility.

Parameter Comparison

Parameter	3225R-103K (Main Part)	1210R-103K (Substitute)	Match Status
Inductance	10 µH	10 µH	Equivalent
Inductance Tolerance	±10%	±10%	Equivalent
Current Rating (Amps)	297 mA	297 mA	Equivalent
DC Resistance (Max)	2.1 Ohm	2.1 Ohm	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	Equivalent
Q @ 7.9 MHz	25	30	Substitute Superior
Self Resonant Frequency	30 MHz	30 MHz	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	1210 (3225 Metric)	2-SMD	Compatible
Length (mm)	3.20	3.26	Within Tolerance
Width (mm)	2.40	2.41	Within Tolerance
Height - Seated (Max) (mm)	2.40	2.57	Within Tolerance
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Substitute Active

Engineering Selection Recommendations

The 1210R-103K is a direct functional equivalent to the obsolete 3225R-103K. Selection of the 1210R-103K is supported by the following engineering factors:

Electrical Performance: All critical electrical parameters—inductance, current rating, DC resistance, core material, and operating temperature range—are identical. The Q factor of the 1210R-103K (30 @ 7.9 MHz) exceeds that of the main part (25 @ 7.9 MHz), indicating superior frequency response characteristics.

Compliance Status: Both components maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring compatibility with modern manufacturing and environmental standards.

Product Availability: The 1210R-103K carries Active product status with 1,369 pieces in stock, compared to the Obsolete 3225R-103K. This ensures long-term supply chain continuity and reduces procurement risk.

Physical Compatibility: Physical dimensions vary by less than 0.1 mm in length and width, and 0.17 mm in height. These variations remain within standard PCB footprint tolerances for 1210-class surface mount inductors, permitting direct board-level substitution without layout modification.

Packaging: The 1210R-103K is supplied in Tape & Reel (TR) format, supporting automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the 1210R-103K replace the 3225R-103K in existing designs?

A: Yes. The 1210R-103K meets all electrical specifications of the 3225R-103K. Physical dimensions are within standard tolerances for 1210-class surface mount components. Direct PCB substitution is permissible without design modification.

Q: What is the difference between the 1210 and 3225 package designations?

A: Both designations refer to surface mount inductor packages in the same size class. The 1210 designation uses imperial units (0.126" × 0.094"), while 3225 uses metric units (3.20mm × 2.40mm). The 1210R-103K uses the 2-SMD package designation but maintains equivalent physical dimensions within manufacturing tolerance.

Q: Are there any performance differences between these parts?

A: The 1210R-103K exhibits a higher Q factor (30 vs. 25 @ 7.9 MHz), indicating lower losses at the test frequency. All other electrical parameters are identical. This represents equivalent or superior performance.

Q: Why is the 3225R-103K marked as Obsolete?

A: The 3225R-103K has reached end-of-life status with the manufacturer. The 1210R-103K is the active production equivalent, ensuring continued availability and supply chain support.

Q: What compliance certifications apply to the substitute part?

A: The 1210R-103K is ROHS3 compliant and REACH unaffected, matching the compliance profile of the original part. Both components carry ECCN EAR99 and HTSUS 8504.50.8000 classifications.

Q: Is the substitute part available in the same packaging format?

A: The 1210R-103K is supplied in Tape & Reel (TR) format, suitable for automated pick-and-place assembly. The original 3225R-103K packaging format is not specified in the provided data.

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