SPD73-153M Equivalent & Substitute Parts

Part Overview

The SPD73-153M is a 15 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.59 A continuous current with a maximum DC resistance of 91 mOhm. The part is classified as obsolete product status, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must match the core electrical parameters—inductance value, current rating, and DC resistance—while maintaining mechanical compatibility within the same package footprint and thermal operating range.

Substiute Parts

SPD73-153M

API Delevan Inc.In Stock: 1177SPD73-153M Datasheet

Current PartRFQ

SPD73R-153M

API Delevan Inc.In Stock: 2960SPD73R-153M Datasheet

DirectRFQ

SRR0735A-150M

Bourns Inc.In Stock: 888SRR0735A-150M Datasheet

SimilarRFQ

SRR0745A-150M

Bourns Inc.In Stock: 7914SRR0745A-150M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical electrical and mechanical parameters:

• Inductance Value: 15 µH (fixed, non-negotiable)
• Current Rating: Minimum 1.59 A continuous current
• DC Resistance: Maximum 91 mOhm (preferred) to 105 mOhm (acceptable within tolerance)
• Core Material: Ferrite, shielded construction
• Package Footprint: 0.287" x 0.287" (7.30mm x 7.30mm) base dimensions
• Operating Temperature: Must support -55°C to 125°C range or equivalent
• Mounting: Surface mount technology
• Test Frequency: 1 kHz inductance measurement standard

The SPD73-153M has three identified substitutes. The direct substitute SPD73R-153M maintains identical electrical specifications with improved product status (active) and RoHS compliance. The similar substitutes from Bourns Inc. (SRR0735A-150M and SRR0745A-150M) provide higher current ratings and lower DC resistance, with slightly increased package heights that remain within mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

SPD73R-153M is the primary recommended substitute. This part maintains identical electrical specifications (15 µH, 1.59 A, 91 mOhm DCR) and mechanical dimensions to the obsolete SPD73-153M, providing direct compatibility without design modification. SPD73R-153M holds active product status, ROHS3 compliance, and MSL 1 rating, enabling long-term availability and supply chain sustainability.

SRR0745A-150M provides superior performance characteristics with 1.9 A current rating and reduced DC resistance (75 mOhm), supporting higher current applications within the same 15 µH inductance specification. The part exhibits increased package height (4.70mm vs. 3.90mm) and operates within a more limited temperature range (-40°C to 125°C). SRR0745A-150M carries AEC-Q200 qualification and ROHS3 compliance.

SRR0735A-150M offers moderate performance improvement with 1.6 A current rating and 105 mOhm DCR, positioned between the base specification and SRR0745A-150M. This part features reduced height (3.70mm) relative to the main part, AEC-Q200 qualification, and ROHS3 compliance, with a -40°C to 125°C operating range.

Selection among these three active substitutes should be based on application current demands, thermal environment constraints, and package height availability within the design footprint.

Frequently Asked Questions (FAQ)

Q: Can SPD73R-153M be used as a one-to-one replacement for SPD73-153M?

A: Yes. SPD73R-153M is a direct substitute with identical inductance (15 µH), current rating (1.59 A), DC resistance (91 mOhm), and package dimensions. The part is a variant of the same SPD73 series with improved compliance and active product status.

Q: What are the key differences between the Bourns substitutes (SRR0735A-150M and SRR0745A-150M)?

A: Both Bourns parts maintain the 15 µH inductance and shielded ferrite core construction. SRR0735A-150M provides 1.6 A current rating with 105 mOhm DCR and 3.70mm height. SRR0745A-150M provides higher performance: 1.9 A current rating, 75 mOhm DCR, and 4.70mm height. Selection depends on current requirements and available package height in the PCB layout.

Q: How does DC resistance affect substitute selection?

A: DC resistance directly impacts power loss and thermal dissipation in the inductor. The main part specifies 91 mOhm maximum. SRR0735A-150M (105 mOhm) produces slightly higher losses, while SRR0745A-150M (75 mOhm) reduces losses. For thermally constrained applications, lower DCR is preferred.

Q: Are there temperature range implications when switching to Bourns parts?

A: The original SPD73-153M operates from -55°C to 125°C. Both Bourns substitutes (SRR0735A-150M and SRR0745A-150M) have a lower minimum temperature limit of -40°C to 125°C. If the application requires operation below -40°C, SPD73R-153M is the required substitute.

Q: What is the significance of AEC-Q200 rating on the Bourns parts?

A: AEC-Q200 certification indicates the part meets automotive-grade reliability standards for passive components. SRR0735A-150M and SRR0745A-150M carry this qualification; the main part and SPD73R-153M do not. Selection for automotive applications should prioritize AEC-Q200 qualified parts.

Q: Can package height differences affect the substitution decision?

A: Package height differences must be evaluated against PCB layout constraints. The main part is 3.90mm; SRR0735A-150M is 3.70mm (compatible with tighter spacing); SRR0745A-150M is 4.70mm (requires verification of clearance above the inductor). All three fit the identical 7.30mm x 7.30mm footprint.

Q: What is MSL 1 rating, and why does it matter?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture conditioning prior to soldering. SPD73R-153M and both Bourns parts carry MSL 1, supporting flexible supply chain and storage management compared to parts with higher MSL requirements.

Q: Is RoHS compliance a mandatory substitution criterion?

A: The original SPD73-153M is RoHS non-compliant. For new designs or applications with RoHS requirements, all three active substitutes (SPD73R-153M, SRR0735A-150M, SRR0745A-150M) provide ROHS3 compliance. For legacy product support, RoHS status may not be a blocking constraint.