SPD125-154M

Part Overview

The SPD125-154M is a 150 µH shielded inductor manufactured by API Delevan Inc., rated for 1 A continuous current with a maximum DC resistance of 300 mOhm. This component is surface-mounted in a nonstandard 12.00mm × 12.00mm package and operates across the temperature range of -55°C to 125°C. The part is currently obsolete, necessitating alternative solutions for new designs and inventory replenishment.

Substiute Parts

SPD125-154M

API Delevan Inc.In Stock: 891SPD125-154M Datasheet

Current PartRFQ

SRR1206-151KL

Bourns Inc.In Stock: 2258SRR1206-151KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD125-154M is determined by the following critical parameters:

• Inductance Value: 150 µH (tolerance range ±20% defines acceptable variation)
• Current Rating: Minimum 1 A continuous current capability
• Shielding Requirement: Shielded construction
• Core Material: Ferrite core
• DC Resistance: Maximum 320 mOhm (allows minor increase from 300 mOhm specification)
• Operating Temperature Range: Minimum -40°C to 125°C (allows narrower upper/lower bounds)
• Surface Mount Packaging: Nonstandard form factor with compatible dimensions
• Saturation Current: Minimum 1 A (higher values acceptable)

The SRR1206-151KL from Bourns Inc. qualifies as a substitute based on matching the inductance, shielding, core material, mounting type, and thermal operating range, while meeting or exceeding current handling capabilities.

Parameter Comparison

Engineering Selection Recommendations

Product Status Considerations: The SPD125-154M is obsolete, rendering the SRR1206-151KL from Bourns Inc. the primary viable alternative. The SRR1206-151KL maintains active manufacturing status with confirmed inventory availability (2171 Pcs New Original In Stock).

Compliance Advantages: The SRR1206-151KL is ROHS3 compliant, whereas the SPD125-154M is RoHS non-compliant. For applications subject to RoHS requirements, the SRR1206-151KL is the recommended selection.

Current Rating Variance: The SRR1206-151KL is rated for 900 mA continuous current compared to the SPD125-154M's 1 A rating. Applications requiring the full 1 A continuous current capability must assess whether 900 mA meets circuit requirements. The substitute's saturation current of 1.6 A exceeds the original part's 1 A specification.

Package Dimension Tolerance: The SRR1206-151KL exhibits slightly larger footprint dimensions (12.70mm vs. 12.00mm length/width, 6.50mm vs. 6.00mm height). PCB layout compatibility must be verified before substitution.

Inductance Tolerance Improvement: The SRR1206-151KL features ±10% inductance tolerance versus ±20% for the SPD125-154M, offering improved precision for circuit design margins.

Frequently Asked Questions (FAQ)

Q: Can the SRR1206-151KL replace the SPD125-154M in all applications?

A: The SRR1206-151KL substitutes the SPD125-154M for applications where 900 mA continuous current satisfies circuit requirements. The 100 mA reduction in continuous current rating must be evaluated against actual circuit current demands. Physical package dimensions are larger; PCB layout must accommodate the increased footprint.

Q: What is the impact of the 20 mOhm increase in DC resistance?

A: The SRR1206-151KL specifies a maximum DC resistance of 320 mOhm versus 300 mOhm for the SPD125-154M. This 20 mOhm difference results in slightly increased resistive losses. Power dissipation calculations should confirm acceptability for the target application.

Q: Are there temperature range restrictions with the SRR1206-151KL?

A: The SRR1206-151KL operates from -40°C to 125°C, compared to the SPD125-154M's -55°C to 125°C range. Applications requiring operation below -40°C cannot use the substitute without thermal performance reassessment.

Q: Does the ±10% inductance tolerance of the SRR1206-151KL provide design advantages?

A: Yes. The tighter ±10% tolerance reduces inductance variation compared to the ±20% specification of the SPD125-154M, improving circuit predictability and reducing design margin requirements.

Q: Is RoHS compliance a determining factor for substitution?

A: For designs or markets mandating RoHS compliance, the SRR1206-151KL (ROHS3 compliant) is the required selection. The SPD125-154M's RoHS non-compliant status restricts its use in regulated applications.

Q: How do the saturation current ratings compare?

A: The SRR1206-151KL provides 1.6 A saturation current versus 1 A for the SPD125-154M. This improvement enhances margin against saturation under transient current conditions.