SPD127-103M Equivalent & Substitute Parts Reference

Part Overview

The SPD127-103M is a 10 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 5.4 A continuous current with a maximum DC resistance of 40 mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is designed for applications requiring fixed inductance in compact nonstandard packages.

The SPD127-103M is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this inductor specification.

Substiute Parts

SPD127-103M

API Delevan Inc.In Stock: 766SPD127-103M Datasheet

Current PartRFQ

HRSPD127-103M

API Delevan Inc.In Stock: 1183HRSPD127-103M Datasheet

SimilarRFQ

SRR1208-100ML

Bourns Inc.In Stock: 3676SRR1208-100ML Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD127-103M are qualified based on the following critical parameters:

Primary Matching Criteria:

• Inductance value: 10 µH (exact match required)
• Inductance tolerance: ±20% (matching specification)
• Core material: Ferrite (shielded construction)
• Shielding: Shielded (electromagnetic containment requirement)
• Mounting type: Surface Mount (PCB assembly compatibility)

Secondary Compatibility Parameters:

• Current rating: Minimum 5.4 A or higher (load capacity)
• DC resistance: 40 mOhm or lower (power loss consideration)
• Operating temperature range: Must encompass or exceed -55°C to 125°C
• Package classification: Nonstandard (physical footprint compatibility)

The substitute parts listed below satisfy the primary matching criteria and maintain electrical performance within acceptable engineering tolerances for direct substitution in the SPD127-103M application circuit.

Parameter Comparison

Engineering Selection Recommendations

HRSPD127-103M (API Delevan Inc.):

The HRSPD127-103M is an active product from the same manufacturer series (HRSPD127) as the obsolete SPD127-103M. This part maintains identical inductance (10 µH) and tolerance (±20%) specifications. The HRSPD127-103M features improved DC resistance (35 mOhm Max versus 40 mOhm Max) and an extended upper operating temperature limit (-55°C to 130°C versus -55°C to 125°C).

The current rating of the HRSPD127-103M is 4.2 A, which is lower than the SPD127-103M rating of 5.4 A. This substitution is suitable for applications where the design current does not exceed 4.2 A. The HRSPD127-103M remains RoHS non-compliant, matching the compliance status of the original part.

SRR1208-100ML (Bourns Inc.):

The SRR1208-100ML is an active product from Bourns Inc. offering the same 10 µH inductance and ±20% tolerance. This part provides superior electrical performance with a DC resistance of 21 mOhm Max (significantly lower than the 40 mOhm Max specification) and a current saturation rating of 6.7 A, supporting the full 5.4 A operating requirement of the original design.

The SRR1208-100ML is ROHS3 compliant, providing regulatory advantage over the non-compliant original part. The operating temperature range is -40°C to 125°C, which covers the upper specification of the original part but does not extend to the -55°C lower limit. This substitution is suitable for applications where the minimum operating temperature requirement is -40°C or higher. The inductance test frequency differs (1 kHz versus 100 kHz), reflecting different measurement methodology but not affecting functional equivalence at the specified inductance value.

Frequently Asked Questions (FAQ)

Q: Can the HRSPD127-103M directly replace the SPD127-103M in all applications?

A: The HRSPD127-103M is electrically equivalent for inductance and tolerance specifications. However, the current rating is 4.2 A compared to 5.4 A for the original part. Direct substitution is valid only when the circuit design current does not exceed 4.2 A. If the application requires the full 5.4 A rating, the SRR1208-100ML is the appropriate choice.

Q: What are the physical dimension differences between these parts?

A: The SPD127-103M measures 0.472" L x 0.472" W x 0.315" H (12.00mm x 12.00mm x 8.00mm). The HRSPD127-103M measures 0.475" L x 0.475" W x 0.355" H (12.07mm x 12.07mm x 9.02mm). The SRR1208-100ML measures 0.500" L x 0.500" W x 0.335" H (12.70mm x 12.70mm x 8.50mm). All three parts are classified as nonstandard packages. PCB layout verification is required to confirm mechanical compatibility.

Q: Does the SRR1208-100ML meet the full temperature operating range of the SPD127-103M?

A: The SRR1208-100ML operates from -40°C to 125°C, which does not include the -55°C lower limit of the original SPD127-103M. If the application requires operation at -55°C, the SRR1208-100ML is not suitable. The HRSPD127-103M maintains the -55°C lower limit and extends to -130°C upper limit.

Q: What is the significance of the different inductance test frequencies?

A: The SPD127-103M and HRSPD127-103M are tested at 100 kHz, while the SRR1208-100ML is tested at 1 kHz. Both measurement frequencies are standard industry practice for inductance characterization. The inductance value of 10 µH is the specified parameter regardless of test frequency. The different test frequencies do not affect functional equivalence in the application circuit.

Q: Is RoHS compliance a factor in selecting a substitute?

A: The SPD127-103M and HRSPD127-103M are both RoHS non-compliant. The SRR1208-100ML is ROHS3 compliant. If the end application or regulatory environment requires RoHS compliance, the SRR1208-100ML is the appropriate selection, provided the temperature range requirement does not extend below -40°C.

Q: What packaging formats are available for these substitute parts?

A: The SPD127-103M is supplied in standard packaging (format not specified). The HRSPD127-103M is supplied in Tape & Reel (TR) format. The SRR1208-100ML is supplied in Cut Tape (CT) and Digi-Reel format. Packaging format affects procurement and assembly processes but does not impact electrical performance.