SPD125-824M Equivalent & Substitute Parts

Part Overview

The SPD125-824M is a 820 µH shielded inductor manufactured by API Delevan Inc., rated for 450 mA with a maximum DC resistance of 1.65Ohm. 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 components essential for ongoing design support and production continuity.

Substiute Parts

SPD125-824M

API Delevan Inc.In Stock: 800SPD125-824M Datasheet

Current PartRFQ

SRR1206-821KL

Bourns Inc.In Stock: 1351SRR1206-821KL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD125-824M is determined by the following critical parameters:

• Inductance Value: 820 µH (exact match required)
• Shielding Type: Shielded configuration
• Core Material: Ferrite
• Mounting Type: Surface Mount
• Current Handling Capability: Minimum 350 mA (substitute must support circuit current demands)
• DC Resistance: Maximum 1.7Ohm (acceptable variance for equivalent performance)
• Operating Temperature Range: Minimum -40°C ~ 125°C (substitute must cover or exceed application requirements)
• Physical Footprint: Comparable dimensions within nonstandard package constraints

The SRR1206-821KL from Bourns Inc. meets these substitution criteria with matching inductance, shielding, core material, and surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

The SRR1206-821KL is a suitable equivalent for the obsolete SPD125-824M based on the following factors:

• Functional Equivalence: Both components provide 820 µH inductance with shielded ferrite cores and surface mount configuration.
• Current Handling: The substitute's 350 mA rating is lower than the original 450 mA specification. Circuit current requirements must not exceed 350 mA for this substitution to be valid.
• DC Resistance: The substitute's 1.7Ohm maximum DCR is within acceptable tolerance of the original 1.65Ohm specification, with negligible impact on circuit performance.
• Compliance Status: The SRR1206-821KL is ROHS3 compliant and active in production, providing long-term availability and regulatory alignment.
• Temperature Range: The substitute operates at -40°C to 125°C, which covers the upper temperature requirement but does not extend to the original -55°C minimum. Applications requiring operation below -40°C require alternative solutions.
• Physical Dimensions: The substitute is slightly larger (12.70mm x 12.70mm vs. 12.00mm x 12.00mm) and taller (6.50mm vs. 6.00mm). PCB layout verification is necessary to confirm fit within space constraints.

Frequently Asked Questions (FAQ)

Q: Can the SRR1206-821KL directly replace the SPD125-824M in all applications?

A: Direct replacement is valid only when circuit current does not exceed 350 mA and operating temperature remains above -40°C. PCB layout must accommodate the slightly larger footprint and increased height.

Q: What is the impact of the lower current rating on circuit performance?

A: If the circuit operates at or below 350 mA, the substitute performs equivalently. If circuit current exceeds 350 mA, the substitute will saturate prematurely, causing inductance degradation and potential component failure.

Q: How does the inductance tolerance difference affect circuit design?

A: The substitute's ±10% tolerance is tighter than the original ±20% tolerance, providing improved inductance consistency. This generally benefits circuit performance without requiring design modifications.

Q: Are there physical installation considerations?

A: Yes. The substitute is 0.70mm wider, 0.70mm longer, and 0.50mm taller than the original. Verify PCB layout clearances and solder reflow profiles before implementation.

Q: What is the significance of the ROHS3 compliance difference?

A: The substitute meets current environmental regulations, while the original does not. For new designs or regulated applications, the substitute's compliance status is advantageous.

Q: Is the saturation current specification relevant for this substitution?

A: The substitute's 650mA saturation current indicates the component can handle transient overcurrent conditions up to that level before inductance collapse. This provides additional design margin for transient protection.