SPD125-105M Equivalent & Substitute Parts

Part Overview

The SPD125-105M is a 1 mH shielded inductor manufactured by API Delevan Inc., rated for 400 mA maximum current with a maximum DC resistance of 2 ohms. This surface-mount component operates across a temperature range of -55°C to 125°C and features a nonstandard package with ferrite core construction. The product has reached obsolete status, necessitating identification of functionally equivalent alternatives to maintain design continuity and ensure supply chain reliability.

Substiute Parts

SPD125-105M

API Delevan Inc.In Stock: 888SPD125-105M Datasheet

Current PartRFQ

SRR1206-102KL

Bourns Inc.In Stock: 1913SRR1206-102KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRR1206-102KL qualifies as a substitute for the SPD125-105M based on the following matching parameters:

Matched Electrical Characteristics:

• Inductance: Both parts rated 1 mH
• Core Material: Both use ferrite construction
• Shielding: Both are shielded designs
• Mounting Type: Both are surface-mount components
• Inductance Frequency Test: Both measured at 1 kHz

Key Differences Requiring Evaluation:

• Current Rating: SPD125-105M rated 400 mA; SRR1206-102KL rated 300 mA
• DC Resistance: SPD125-105M maximum 2 Ohm; SRR1206-102KL maximum 2.3 Ohm
• Tolerance: SPD125-105M ±20%; SRR1206-102KL ±10%
• Operating Temperature: SPD125-105M -55°C to 125°C; SRR1206-102KL -40°C to 125°C
• Package Dimensions: SPD125-105M 12.00mm × 12.00mm × 6.00mm; SRR1206-102KL 12.70mm × 12.70mm × 6.50mm

The SRR1206-102KL shares the critical 1 mH inductance value and ferrite-shielded construction but operates at a reduced maximum current rating and exhibits slightly higher DC resistance, making it suitable only for applications that do not exceed 300 mA current demands.

Parameter Comparison

Engineering Selection Recommendations

Selection of the SRR1206-102KL as a substitute requires verification that circuit operating current does not exceed 300 mA. The Bourns SRR1206-102KL offers the advantage of active product status, ensuring ongoing supply availability and technical support. The SRR1206-102KL achieves ROHS3 compliance, whereas the SPD125-105M is non-compliant, making the substitute beneficial for environmentally regulated applications.

The dimensional increase from 12.00mm × 12.00mm to 12.70mm × 12.70mm and height increase from 6.00mm to 6.50mm must be evaluated against available printed circuit board real estate. The improved tolerance specification of ±10% for the SRR1206-102KL compared to ±20% for the original part enhances inductance precision in circuit applications.

The reduced maximum current saturation rating and elevated DC resistance of the SRR1206-102KL result in higher power dissipation under identical load conditions, requiring thermal evaluation in applications approaching the 300 mA ceiling.

Frequently Asked Questions (FAQ)

Q: Can the SRR1206-102KL directly replace the SPD125-105M in all applications? A: Direct replacement is limited by current rating. The SRR1206-102KL supports a maximum of 300 mA continuous current, while the SPD125-105M is rated for 400 mA. Applications operating below 300 mA are compatible.

Q: What impact does the higher DC resistance (2.3 Ohm vs. 2 Ohm) have on circuit performance? A: The 0.3 Ohm difference increases power dissipation. At 300 mA operating current, the SRR1206-102KL dissipates an additional 27 mW compared to the original part.

Q: Are there package dimension compatibility concerns? A: The SRR1206-102KL is 0.70mm larger in length and width, and 0.50mm taller. Printed circuit board footprint design must accommodate these dimensional increases, and vertical clearance above the inductor must be verified.

Q: Does the tighter tolerance of the SRR1206-102KL affect circuit design? A: The ±10% tolerance of the SRR1206-102KL provides improved inductance precision compared to the ±20% tolerance of the SPD125-105M, enabling tighter circuit parameter control without design modifications.

Q: What is the significance of the RoHS3 compliance difference? A: The SRR1206-102KL achieves RoHS3 compliance, meeting environmental regulations for hazardous substance restrictions. The SPD125-105M non-compliance may restrict deployment in regulated industries or regions with material restriction mandates.

Q: How does the operating temperature range differ? A: The SPD125-105M operates from -55°C to 125°C, while the SRR1206-102KL operates from -40°C to 125°C. Applications requiring below -40°C operation must retain the original part or identify alternatives with extended low-temperature ratings.