SPD73-103M 10µH Shielded Drum Core Wirewound Inductor

Part Overview

The SPD73-103M is a 10 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.86 A with a maximum DC resistance of 67 mOhm. This component is classified as obsolete, making it necessary to identify suitable equivalent and substitute parts for ongoing design support and procurement continuity. Substitute parts maintain the same inductance value and core shielding while offering improved current ratings, compliance certifications, and active product status.

Substiute Parts

SPD73-103M

API Delevan Inc.In Stock: 819SPD73-103M Datasheet

Current PartRFQ

SPD73R-103M

API Delevan Inc.In Stock: 954SPD73R-103M Datasheet

DirectRFQ

SRR0745A-100M

Bourns Inc.In Stock: 3216SRR0745A-100M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPD73-103M are selected based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Inductance: Identical 10 µH value
• Core Material: Ferrite shielded construction
• Inductance Tolerance: ±20%
• Current Rating: Equal to or greater than 1.86 A
• DC Resistance: Equivalent or lower than 67 mOhm Max
• Operating Temperature Range: Minimum -55°C ~ 125°C or equivalent

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package Size: 7.30mm x 7.30mm (0.287" x 0.287")
• Height - Seated: Compatible with 3.90mm (0.154") maximum

Preferred Substitutes meet or exceed these parameters while offering active product status and current compliance certifications (RoHS3, REACH Unaffected).

Parameter Comparison

Engineering Selection Recommendations

SPD73R-103M (API Delevan Inc., Direct Manufacturer Upgrade) The SPD73R-103M is the primary direct manufacturer substitute for the obsolete SPD73-103M. This part maintains identical electrical parameters (10 µH inductance, ±20% tolerance, 67 mOhm Max DCR) and identical mechanical dimensions. The SPD73R-103M offers an improved current rating of 2.5 A, exceeding the original 1.86 A specification. This part holds Active product status and meets ROHS3 Compliance with MSL 1 (Unlimited). For designs requiring RoHS compliance and continued manufacturer support, the SPD73R-103M is the recommended primary substitute.

SRR0745A-100M (Bourns Inc., Alternative Manufacturer Substitute) The SRR0745A-100M represents an alternative from Bourns Inc., maintaining the 10 µH inductance and ferrite shielded construction. This part features a superior DC resistance specification of 52 mOhm Max (compared to 67 mOhm Max) and a current rating of 2.1 A. The SRR0745A-100M is rated for AEC-Q200 and ROHS3 Compliance with MSL 1 (Unlimited). The mechanical footprint is identical in length and width (7.30mm x 7.30mm), with a slightly increased height of 4.70mm. The operating temperature range is -40°C ~ 125°C. This part is suitable for applications where lower DC resistance or automotive-grade qualification (AEC-Q200) is beneficial.

Frequently Asked Questions (FAQ)

Q: Can the SPD73R-103M directly replace the SPD73-103M? A: Yes. The SPD73R-103M is a direct manufacturer substitute that maintains the same 10 µH inductance, ferrite shielded core, ±20% tolerance, 67 mOhm Max DC resistance, and identical surface mount dimensions (7.30mm x 7.30mm, 3.90mm height). The improved 2.5 A current rating provides additional design margin. The primary difference is active product status and ROHS3 compliance.

Q: What are the key differences between SPD73R-103M and SRR0745A-100M? A: Both parts share the same 10 µH inductance, ferrite shielding, and identical lateral dimensions (7.30mm x 7.30mm). The SPD73R-103M maintains the original manufacturer (API Delevan) with 67 mOhm Max DCR, while the SRR0745A-100M (Bourns) offers improved 52 mOhm Max DCR and AEC-Q200 qualification. The SRR0745A-100M has a slightly increased height of 4.70mm versus 3.90mm. Current ratings are 2.5 A and 2.1 A respectively.

Q: Is there a difference in operating temperature range? A: The SPD73-103M and SPD73R-103M both operate from -55°C ~ 125°C. The SRR0745A-100M operates from -40°C ~ 125°C, providing a narrower lower temperature range. Select SPD73R-103M if the design requires operation below -40°C.

Q: Are all substitute parts RoHS compliant? A: The SPD73-103M is RoHS non-compliant. Both substitute parts, SPD73R-103M and SRR0745A-100M, are ROHS3 Compliant. Designs requiring RoHS compliance must use either substitute part.

Q: Does PCB layout need adjustment if substituting with SRR0745A-100M? A: The lateral footprint remains identical (7.30mm x 7.30mm), so PCB pad layout requires no change. However, the SRR0745A-100M has a maximum seated height of 4.70mm compared to 3.90mm for the original part. Verify clearance above the component for mechanical compatibility in the final assembly.

Q: Which substitute is preferred for new designs? A: For new designs requiring manufacturer continuity, the SPD73R-103M is recommended as the direct upgrade from API Delevan Inc. with identical electrical parameters and active product status. The SRR0745A-100M is preferred when lower DC resistance, automotive qualification (AEC-Q200), or alternative sourcing is advantageous.