SPD125-564M Equivalent & Substitute Parts

Part Overview

The SPD125-564M is a 560 µH shielded inductor manufactured by API Delevan Inc., rated for 550 mA with a maximum DC resistance of 1 Ohm. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part features surface mount packaging in a nonstandard 12.00mm x 12.00mm footprint with ferrite core construction and operates across the temperature range of -55°C to 125°C.

Substiute Parts

SPD125-564M

API Delevan Inc.In Stock: 1001SPD125-564M Datasheet

Current PartRFQ

SRR1206-561KL

Bourns Inc.In Stock: 1202SRR1206-561KL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the SPD125-564M is determined by the following critical parameters:

• Inductance Value: 560 µH (primary electrical requirement)
• Current Rating: Minimum 550 mA to maintain circuit performance
• DC Resistance: Maximum 1 Ohm to ensure acceptable power dissipation
• Shielding: Shielded construction to prevent electromagnetic interference
• Core Material: Ferrite for consistent magnetic properties
• Mounting Type: Surface mount compatibility
• Package Footprint: Nonstandard 12.00mm x 12.00mm form factor

The SRR1206-561KL from Bourns Inc. qualifies as a substitute based on matching inductance (560 µH), shielded ferrite core construction, surface mount configuration, and compatible physical dimensions. While the current rating is reduced to 450 mA and DCR increases to 1.32 Ohm Max, these parameters remain within acceptable tolerance for many applications requiring the SPD125-564M.

Parameter Comparison

Engineering Selection Recommendations

The SRR1206-561KL serves as the primary substitute for the obsolete SPD125-564M. Selection should be based on the following factors:

Product Status: The SPD125-564M is obsolete with limited inventory availability (900 Pcs). The SRR1206-561KL is active production with established supply (1101 Pcs in stock), ensuring long-term component availability.

Compliance Considerations: The SRR1206-561KL achieves ROHS3 compliance, whereas the SPD125-564M is RoHS non-compliant. For applications subject to RoHS regulations, the Bourns substitute is required.

Electrical Performance: Both inductors maintain 560 µH inductance at 1 kHz. The SRR1206-561KL offers tighter tolerance (±10% vs ±20%), improving circuit predictability. The reduced current rating (450 mA vs 550 mA) and increased DCR (1.32 Ohm vs 1 Ohm) require circuit-level evaluation for applications operating at maximum current specifications.

Temperature Range: The SPD125-564M operates from -55°C to 125°C, while the SRR1206-561KL operates from -40°C to 125°C. Applications requiring operation below -40°C cannot use the Bourns substitute.

Physical Compatibility: Dimensional differences (12.70mm x 12.70mm vs 12.00mm x 12.00mm) require PCB layout verification to confirm mechanical fit within available space.

Frequently Asked Questions (FAQ)

Q: Can the SRR1206-561KL directly replace the SPD125-564M in all applications?

A: Direct replacement requires circuit-level analysis. The reduced current rating (450 mA vs 550 mA) and increased DCR (1.32 Ohm vs 1 Ohm) may impact performance in high-current or low-loss applications. Temperature range compatibility must also be confirmed for operation below -40°C.

Q: What are the key electrical differences between these inductors?

A: Both maintain 560 µH inductance. The SRR1206-561KL provides tighter tolerance (±10% vs ±20%), higher saturation current (800 mA vs 550 mA), and lower DCR tolerance. The SPD125-564M supports higher continuous current (550 mA vs 450 mA) and wider temperature range (-55°C to 125°C vs -40°C to 125°C).

Q: Are there physical compatibility concerns?

A: Yes. The SRR1206-561KL is slightly larger (12.70mm x 12.70mm x 6.50mm vs 12.00mm x 12.00mm x 6.00mm). PCB layout must accommodate the increased footprint and height before substitution.

Q: Which part should be selected for new designs?

A: The SRR1206-561KL is recommended for new designs due to active production status, ROHS3 compliance, and established supply chain. The SPD125-564M should only be used in legacy applications where its specific electrical or temperature characteristics are required.

Q: What is the impact of increased DC resistance on circuit performance?

A: The 0.32 Ohm increase in DCR (1 Ohm to 1.32 Ohm) results in proportionally higher power dissipation. At 450 mA, dissipation increases from 202.5 mW to 267.3 mW. Thermal management and circuit efficiency must be evaluated for applications sensitive to inductor losses.