SPD127-123M Equivalent & Substitute Parts

Part Overview

The SPD127-123M is a 12 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc., rated for 4.9 A with a maximum DC resistance of 45 mOhm. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 125°C and is mounted as a surface mount device in a nonstandard package measuring 12.00mm × 12.00mm × 8.00mm (seated height).

Due to its obsolete status, alternative components with matching or compatible electrical and mechanical specifications are required for new production runs, redesigns, or inventory replenishment.

Substiute Parts

SPD127-123M

API Delevan Inc.In Stock: 745SPD127-123M Datasheet

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HRSPD127-123M

API Delevan Inc.In Stock: 772HRSPD127-123M Datasheet

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SRR1208-120ML

Bourns Inc.In Stock: 1596SRR1208-120ML Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD127-123M are selected based on strict electrical and mechanical compatibility criteria. The following parameters define acceptable substitution:

Primary Matching Criteria:

• Inductance value: 12 µH (exact match required)
• Inductance tolerance: ±20% (exact match required)
• Core material: Ferrite (exact match required)
• Shielding: Shielded (exact match required)
• Mounting type: Surface Mount (exact match required)

Secondary Compatibility Criteria:

• Current rating: Equal to or greater than 4.9 A
• DC resistance: Equal to or less than 45 mOhm
• Operating temperature range: Must encompass or exceed -55°C ~ 125°C
• Package dimensions: Nonstandard packages with similar footprint and height constraints

Compliance Considerations:

• RoHS and REACH status are noted but do not disqualify substitutes
• Product status (Active vs. Obsolete) is documented for procurement planning

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

HRSPD127-123M (API Delevan Inc.)

This substitute is manufactured by the same supplier as the main part and maintains API Delevan's SPD series design lineage through the HRSPD127 series designation. The part is currently in active production status, ensuring long-term availability. DC resistance of 41 mOhm is superior to the 45 mOhm specification of SPD127-123M. However, the current rating of 3.9 A is below the 4.9 A requirement of the main part. This substitute is suitable only for applications where the actual operating current does not exceed 3.9 A. The operating temperature range extends to 130°C, providing additional thermal margin. Package dimensions are nearly identical (12.07mm vs. 12.00mm), with a slightly increased seated height of 9.02mm versus 8.00mm. RoHS non-compliance status matches the main part.

SRR1208-120ML (Bourns Inc.)

This substitute is manufactured by Bourns Inc. and is in active production status. The current rating of 4.8 A meets the 4.9 A requirement of the main part. DC resistance of 25 mOhm is significantly lower than the 45 mOhm specification, providing improved thermal performance. Saturation current of 6.5 A provides additional design margin. The operating temperature range of -40°C to 125°C covers the upper specification of the main part but does not extend to the -55°C lower limit. Package footprint is slightly larger at 12.70mm × 12.70mm with a seated height of 8.50mm. This substitute is ROHS3 compliant, offering regulatory advantage over the main part. The SRR1208 series is widely available in tape and reel packaging.

Selection Criteria Summary:

• For applications requiring full -55°C lower temperature operation: HRSPD127-123M (with current derating consideration)
• For applications with current requirements up to 4.8 A and operating above -40°C: SRR1208-120ML (preferred for RoHS3 compliance and superior DC resistance)
• For applications with current requirements below 3.9 A: Either substitute is acceptable

Frequently Asked Questions (FAQ)

Q: Can HRSPD127-123M replace SPD127-123M in all applications?

A: HRSPD127-123M is electrically compatible for inductance, tolerance, core material, and shielding. However, the current rating of 3.9 A is lower than the 4.9 A specification of SPD127-123M. Substitution is valid only if the actual operating current in the application does not exceed 3.9 A. Verify circuit current requirements before selection.

Q: What is the impact of the lower DC resistance in SRR1208-120ML?

A: The SRR1208-120ML has a DC resistance of 25 mOhm compared to 45 mOhm in SPD127-123M. Lower DC resistance reduces resistive losses and heat generation in the inductor. This is a beneficial characteristic and does not create compatibility issues. The inductor will operate cooler under the same current conditions.

Q: Does the package size difference affect PCB layout?

A: SPD127-123M measures 12.00mm × 12.00mm with 8.00mm seated height. HRSPD127-123M measures 12.07mm × 12.07mm with 9.02mm seated height. SRR1208-120ML measures 12.70mm × 12.70mm with 8.50mm seated height. All three parts are nonstandard packages with similar footprints. Verify PCB pad spacing and clearance requirements. The height differences may affect solder reflow profiles and component stacking in multi-layer assemblies.

Q: Why does SRR1208-120ML test inductance at 1 kHz while HRSPD127-123M tests at 100 kHz?

A: Inductance test frequency affects measured values due to frequency-dependent core behavior. Both parts specify 12 µH inductance with ±20% tolerance. The tolerance band accommodates frequency-dependent variation. For circuit operation, use the inductance value specified at the test frequency closest to your operating frequency. If operating near 1 kHz, SRR1208-120ML data is directly applicable. If operating near 100 kHz, HRSPD127-123M data is directly applicable.

Q: Is RoHS compliance required for my application?

A: SPD127-123M and HRSPD127-123M are both RoHS non-compliant. SRR1208-120ML is ROHS3 compliant. If RoHS3 compliance is a regulatory requirement, SRR1208-120ML is the only substitute meeting this criterion. If RoHS compliance is not required, all three parts are acceptable from a regulatory standpoint.

Q: What is the minimum operating temperature consideration?

A: SPD127-123M operates from -55°C to 125°C. HRSPD127-123M operates from -55°C to 130°C. SRR1208-120ML operates from -40°C to 125°C. If your application requires operation at temperatures below -40°C, SRR1208-120ML is not suitable. HRSPD127-123M maintains the full -55°C lower limit of the main part.

Q: Are these parts available in tape and reel packaging?

A: SPD127-123M packaging is listed as nonstandard with no specified reel format. HRSPD127-123M and SRR1208-120ML are both available in Tape & Reel (TR) packaging, which is standard for automated assembly processes. If tape and reel packaging is required for production, both substitutes are suitable.