SPD125-224M Equivalent & Substitute Parts

Part Overview

The SPD125-224M is a 220 µH shielded inductor manufactured by API Delevan Inc., rated for 800 mA with a maximum DC resistance of 420mOhm. 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 equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

SPD125-224M

API Delevan Inc.In Stock: 967SPD125-224M Datasheet

Current PartRFQ

B82477G2224M000

EPCOS - TDK ElectronicsIn Stock: 1568B82477G2224M000 Datasheet

SimilarRFQ

SRR1206-221KL

Bourns Inc.In Stock: 1330SRR1206-221KL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD125-224M is determined by the following critical parameters:

• Inductance Value: 220 µH (exact match required)
• Current Rating: Minimum 800 mA
• DC Resistance: Maximum 420mOhm
• Shielding: Shielded configuration
• Core Material: Ferrite
• Mounting Type: Surface Mount
• Operating Temperature Range: Must encompass -55°C to 125°C or equivalent operational envelope
• Package Compatibility: Physical dimensions and height constraints

The identified substitute parts meet these core electrical and mechanical criteria, enabling direct functional replacement in applications designed for the SPD125-224M.

Parameter Comparison

Engineering Selection Recommendations

B82477G2224M000 (EPCOS - TDK Electronics)

This substitute provides the closest electrical match to the SPD125-224M. It maintains identical inductance (220 µH), current rating (800 mA), and operating temperature range (-55°C to 125°C). The DC resistance is superior at 400mOhm maximum versus 420mOhm. The part is currently active in production and ROHS3 compliant, addressing regulatory requirements. Physical dimensions are marginally larger (12.30mm vs 12.00mm), requiring verification of PCB layout constraints. Packaging is supplied as Tape & Reel.

SRR1206-221KL (Bourns Inc.)

This substitute offers improved tolerance (±10% versus ±20%) and lower DC resistance specification (460mOhm maximum). However, the current rating is reduced to 700 mA, which is below the 800 mA requirement of the main part. This limitation restricts application to circuits where peak current demand does not exceed 700 mA. The part is active and ROHS3 compliant. Physical dimensions are larger (12.70mm x 12.70mm with 6.50mm height), requiring PCB layout verification. Packaging is supplied as Cut Tape & Digi-Reel.

For applications requiring full 800 mA current capacity, B82477G2224M000 is the preferred substitute. For applications with reduced current requirements (≤700 mA), SRR1206-221KL offers superior tolerance and compliance characteristics.

Frequently Asked Questions (FAQ)

Q: Can SRR1206-221KL replace SPD125-224M in all applications?

A: No. SRR1206-221KL has a maximum current rating of 700 mA, while SPD125-224M is rated for 800 mA. Substitution is valid only for circuits where the actual operating current does not exceed 700 mA. Exceeding this limit may cause inductor saturation and performance degradation.

Q: What are the physical space implications of using substitute parts?

A: B82477G2224M000 increases footprint from 12.00mm to 12.30mm (both length and width). SRR1206-221KL further increases to 12.70mm x 12.70mm. Height increases from 6.00mm to 6.50mm for SRR1206-221KL. Verify PCB layout clearances before implementation.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both B82477G2224M000 and SRR1206-221KL are ROHS3 compliant, whereas the original SPD125-224M is RoHS non-compliant. This compliance improvement may be required for new designs or regulatory updates.

Q: How do tolerance differences affect circuit performance?

A: SPD125-224M and B82477G2224M000 both specify ±20% tolerance. SRR1206-221KL specifies ±10% tolerance, providing tighter inductance control. For applications sensitive to inductance variation, SRR1206-221KL offers superior stability, provided current requirements remain within its 700 mA rating.

Q: What is the significance of DC resistance differences?

A: SPD125-224M specifies 420mOhm maximum DCR. B82477G2224M000 offers 400mOhm (lower, better performance). SRR1206-221KL specifies 460mOhm (higher). Lower DCR reduces power dissipation and heat generation. For thermal-sensitive applications, B82477G2224M000 is preferred.

Q: Can I use these parts interchangeably in existing designs?

A: Physical dimension differences require PCB layout verification. Electrical parameters (inductance, current rating, DCR) must be validated against circuit requirements. Thermal and compliance considerations should be evaluated before implementation.