SPD125R-124M

Part Overview

The SPD125R-124M is a 120 µH shielded drum core, wirewound inductor manufactured by API Delevan Inc. This surface mount component is rated for 1.1 A continuous current with a maximum DC resistance of 250 mOhm and operates across the temperature range of -55°C to 125°C. The part is ROHS3 compliant and carries an active product status with 781 units currently in stock. Equivalent and substitute parts may be required due to inventory constraints, design revisions, or supply chain considerations where functionally compatible alternatives are needed.

Substiute Parts

SPD125R-124M

API Delevan Inc.In Stock: 881SPD125R-124M Datasheet

Current PartRFQ

SRR1206-121YL

Bourns Inc.In Stock: 892SRR1206-121YL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRR1206-121YL from Bourns Inc. qualifies as a functional substitute for the SPD125R-124M based on the following critical parameters:

Matching Electrical Characteristics:

• Inductance: 120 µH (identical specification)
• Shielding: Shielded (identical)
• Core Material: Ferrite (identical)
• Core Type: Drum Core, Wirewound (identical)
• Operating Temperature Range: -40°C to 125°C (encompasses -55°C to 125°C requirement with exception of lower limit)
• RoHS Compliance: ROHS3 Compliant (identical regulatory status)
• MSL Rating: 1 (Unlimited) (identical)
• Mounting Type: Surface Mount (identical)
• Inductance Test Frequency: 1 kHz (identical)

Compatible Current Handling:

• SPD125R-124M: 1.1 A rated / 1.1 A saturation
• SRR1206-121YL: 1.0 A rated / 1.8 A saturation

The substitute part's 1.8 A saturation current exceeds the application requirement, providing design margin.

DC Resistance Compatibility:

• SPD125R-124M: 250 mOhm Max
• SRR1206-121YL: 260 mOhm Max

The 10 mOhm difference falls within acceptable tolerance band for this component class.

Physical Compatibility:

• SPD125R-124M: 12.00 mm x 12.00 mm x 6.00 mm (max height)
• SRR1206-121YL: 12.70 mm x 12.70 mm x 6.50 mm (max height)

Both components use nonstandard packaging with compatible surface mount footprints suitable for the same PCB design with minimal layout adjustment.

Parameter Comparison

Engineering Selection Recommendations

Both the SPD125R-124M and SRR1206-121YL maintain active product status and ROHS3 compliance, satisfying regulatory requirements for industrial and commercial applications. Component selection should be based on availability, lead time, and supply chain considerations. The SRR1206-121YL exhibits improved inductance tolerance (±15% versus ±20%) and higher saturation current (1.8 A), providing enhanced design margin for current transients. Physical dimensions differ slightly; PCB layout verification is required to confirm the 0.70 mm increase in length and width, as well as the 0.50 mm increase in seated height, will not create mounting conflicts in the target application.

Frequently Asked Questions (FAQ)

Q: Can the SRR1206-121YL directly replace the SPD125R-124M without PCB modifications?

A: Both components share identical mounting type (surface mount) and package category (nonstandard). Physical dimensions vary by less than 0.7 mm in length and width with 0.5 mm additional height. Confirmation of available PCB clearance is necessary before committing to substitution.

Q: What is the impact of the 10 mOhm difference in DC resistance?

A: The SPD125R-124M specifies 250 mOhm maximum DC resistance, while the SRR1206-121YL specifies 260 mOhm maximum. This 4% difference falls within acceptable tolerance for inductor power loss calculations in most filtering and energy storage applications. Circuit validation should confirm power dissipation remains within thermal budget.

Q: Are there temperature range differences between these inductors?

A: The SPD125R-124M operates from -55°C to 125°C, while the SRR1206-121YL operates from -40°C to 125°C. If the application requires operation below -40°C, the API Delevan SPD125R-124M is the appropriate selection. For standard industrial temperature ranges, both parts are equivalent.

Q: What does the saturation current difference mean for my circuit?

A: The SPD125R-124M saturates at 1.1 A, matching its current rating. The SRR1206-121YL saturates at 1.8 A while rated for 1.0 A continuous current. This higher saturation rating provides additional margin against transient current spikes without inductor core saturation, beneficial for switching power supply and energy harvesting applications.

Q: Are both parts available with identical lead times and inventory levels?

A: Current inventory includes 781 units of SPD125R-124M and 808 units of SRR1206-121YL. Lead times and availability are subject to market conditions and supplier stock levels at the time of procurement.