SPD125R-154M Equivalent & Substitute Parts

Part Overview

The SPD125R-154M is a 150 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications with a current rating of 1 A and maximum DC resistance of 300 mOhm. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for the application.

Substiute Parts

SPD125R-154M

API Delevan Inc.In Stock: 775SPD125R-154M Datasheet

Current PartRFQ

SRR1206-151KL

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

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD125R-154M are identified based on the following critical parameters:

Primary Matching Criteria:

• Inductance value: 150 µH (exact match required)
• Core material and shielding: Ferrite, shielded drum core configuration
• Mounting technology: Surface mount
• Package format: Tape & Reel

Secondary Compatibility Parameters:

• Current rating: Minimum 900 mA (substitute must support primary application current)
• DC resistance: Maximum 320 mOhm (within acceptable operating margin)
• Operating temperature range: Minimum -40°C to 125°C (covers primary part range)
• Compliance: RoHS3 and REACH status alignment

The SRR1206-151KL from Bourns Inc. meets these substitution criteria with equivalent inductance, shielded ferrite core construction, and surface mount configuration.

Parameter Comparison

Engineering Selection Recommendations

SPD125R-154M (Primary Part):

• Select when operating temperature range must extend to -55°C
• Select when PCB space is constrained (smaller 12.00mm x 12.00mm footprint)
• Select when maximum height of 6.00mm is required
• Active product status with established supply chain

SRR1206-151KL (Substitute Part):

• Select when operating temperature minimum of -40°C is acceptable
• Select when tighter inductance tolerance (±10%) is required
• Select when higher saturation current (1.6 A) provides design margin
• Select when larger footprint (12.70mm x 12.70mm) and height (6.50mm) are accommodated
• Higher inventory availability (2171 Pcs vs 671 Pcs)
• Active product status with established supply chain

Both parts maintain RoHS3 compliance and REACH unaffected status. Selection between primary and substitute should be based on specific application requirements for temperature range, PCB layout constraints, and tolerance specifications.

Frequently Asked Questions (FAQ)

Q: Can SRR1206-151KL replace SPD125R-154M in all applications?

A: Substitution is valid when the application operates within -40°C to 125°C temperature range, accommodates the larger footprint (12.70mm x 12.70mm vs 12.00mm x 12.00mm), and accepts the increased height (6.50mm vs 6.00mm). If the application requires -55°C operation or has strict PCB space constraints, the primary part SPD125R-154M is required.

Q: What is the impact of the 100 mA current rating difference?

A: The SRR1206-151KL is rated at 900 mA versus the SPD125R-154M at 1 A. For applications operating at or near 1 A continuous current, the primary part is recommended. For applications operating below 900 mA, the substitute is acceptable. The substitute's higher saturation current (1.6 A) provides additional margin for transient conditions.

Q: Are there mechanical compatibility concerns with the substitute?

A: The substitute has a larger footprint (0.5mm wider and longer) and greater height (0.5mm taller). PCB layout must accommodate these dimensional differences. Verify clearance with adjacent components and confirm that the increased height does not conflict with enclosure or assembly constraints.

Q: How do the inductance tolerances affect circuit performance?

A: The primary part has ±20% tolerance while the substitute has ±10% tolerance. For applications requiring tighter inductance control, the SRR1206-151KL provides superior tolerance performance. Both parts are tested at 1 kHz per standard measurement conditions.

Q: Are both parts suitable for high-reliability applications?

A: Both parts are Active status products with RoHS3 compliance and REACH unaffected status. Both have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. Selection should be based on specific application temperature and mechanical requirements rather than reliability considerations.

Q: What is the DC resistance impact on thermal performance?

A: The substitute has 320 mOhm maximum DC resistance versus 300 mOhm for the primary part. At 1 A continuous current, this represents an additional 20 mW power dissipation (I²R loss). For thermal-sensitive applications, verify that the substitute's increased resistance remains within acceptable limits.