SPD125-103M Equivalent & Substitute Parts

Part Overview

The SPD125-103M is a 10 µH shielded inductor manufactured by API Delevan Inc., rated for 4 A continuous current with a maximum DC resistance of 55 mOhm. This surface mount component features a ferrite core and operates across the temperature range of -55°C to 125°C. The part is classified as obsolete, making identification of suitable equivalent and substitute components essential for ongoing design support and procurement planning.

Key Parameters

Parameter	SPD125-103M
Inductance	10 µH
Current Rating	4 A
DC Resistance (DCR)	55 mOhm Max
Tolerance	±20%
Shielding	Shielded
Core Material	Ferrite
Mounting Type	Surface Mount
Operating Temperature	-55°C to 125°C
Package Type	Nonstandard
Size	12.00 mm × 12.00 mm × 6.00 mm (H)

Substitute Part Grouping Explanation

Substitution eligibility for the SPD125-103M is determined by the following critical parameters:

Inductance Value: Must be 10 µH (±20% tolerance acceptable)
Current Rating: Must support minimum 4 A continuous current
DC Resistance: Lower or equal DCR values are acceptable; higher values indicate increased power loss
Shielding: Must be shielded to maintain electromagnetic compatibility
Core Material: Ferrite core required for performance consistency
Mounting Type: Surface mount configuration mandatory
Operating Temperature Range: Must encompass or exceed -55°C to 125°C
Package Compatibility: Physical dimensions and height must accommodate existing PCB layouts

Two substitute parts meet these criteria: HRSPD125-103M (API Delevan Inc.) and SRR1206-100ML (Bourns Inc.). Both maintain the 10 µH inductance, support the required current rating, feature shielded ferrite cores, and are available in active product status.

Parameter Comparison

Parameter	SPD125-103M	HRSPD125-103M	SRR1206-100ML
Manufacturer	API Delevan Inc.	API Delevan Inc.	Bourns Inc.
Inductance	10 µH	10 µH	10 µH
Tolerance	±20%	±20%	±20%
Current Rating (Amps)	4 A	4 A	3.3 A
DC Resistance (DCR)	55 mOhm Max	30 mOhm Max	35 mOhm Max
Shielding	Shielded	Shielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite
Operating Temperature	-55°C to 125°C	-55°C to 130°C	-40°C to 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size (L × W)	12.00 mm × 12.00 mm	12.07 mm × 12.07 mm	12.70 mm × 12.70 mm
Height (Max)	6.00 mm	7.02 mm	6.50 mm
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

HRSPD125-103M is the primary substitute for SPD125-103M. Both components are manufactured by API Delevan Inc. and share identical electrical specifications (10 µH, 4 A, ±20% tolerance). The HRSPD125-103M offers superior performance with reduced DC resistance (30 mOhm vs. 55 mOhm), extended operating temperature range (-55°C to 130°C), and ROHS3 compliance. Physical dimensions are nearly identical (12.07 mm vs. 12.00 mm), with a marginal height increase (7.02 mm vs. 6.00 mm). This component is currently in active production status with established supply availability.

SRR1206-100ML serves as a secondary substitute when HRSPD125-103M is unavailable. Manufactured by Bourns Inc., this component maintains 10 µH inductance and shielded ferrite construction. The current rating is reduced to 3.3 A (versus 4 A required), making it suitable only for applications where actual current demand does not exceed 3.3 A. DC resistance is 35 mOhm, representing a 36% improvement over the original SPD125-103M. Physical footprint is slightly larger (12.70 mm × 12.70 mm), and the operating temperature minimum is -40°C (versus -55°C). ROHS3 compliance and active product status are confirmed.

Frequently Asked Questions (FAQ)

Q: Can HRSPD125-103M directly replace SPD125-103M without circuit modification?

A: Yes. Both components share identical inductance (10 µH), current rating (4 A), tolerance (±20%), and core material (ferrite). The HRSPD125-103M features lower DC resistance and improved temperature range, providing enhanced performance. Physical dimensions are nearly identical; verify PCB layout clearance for the 7.02 mm height versus the original 6.00 mm.

Q: Is SRR1206-100ML suitable for all SPD125-103M applications?

A: SRR1206-100ML is suitable only for applications where the actual operating current does not exceed 3.3 A. The component is rated for 3.3 A continuous current, below the original 4 A specification. Verify circuit current requirements before selection. All other electrical parameters (inductance, tolerance, shielding, core material) are compatible.

Q: What are the compliance differences between the three components?

A: SPD125-103M is RoHS non-compliant. Both HRSPD125-103M and SRR1206-100ML are ROHS3 compliant. For applications requiring RoHS compliance, either substitute is acceptable. Both substitutes are REACH unaffected and carry EAR99 ECCN classification.

Q: How do DC resistance values affect circuit performance?

A: DC resistance directly impacts power dissipation and voltage drop across the inductor. HRSPD125-103M (30 mOhm) and SRR1206-100ML (35 mOhm) both exhibit significantly lower resistance than SPD125-103M (55 mOhm), resulting in reduced heat generation and improved efficiency. Lower DCR is advantageous in power supply and filtering applications.

Q: Are there packaging considerations for production transition?

A: SPD125-103M is supplied in bulk packaging. Both HRSPD125-103M and SRR1206-100ML are supplied in Tape & Reel (TR) format, standard for automated assembly. Verify that production equipment is compatible with TR packaging, or confirm availability of bulk packaging options through the manufacturer.

Q: What is the impact of the operating temperature range difference?

A: HRSPD125-103M extends the upper temperature limit to 130°C (versus 125°C). SRR1206-100ML reduces the lower temperature limit to -40°C (versus -55°C). For applications operating below -40°C or above 130°C, verify that the selected substitute meets the required temperature specifications.

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