SPD73-154M Equivalent & Substitute Parts

Part Overview

The SPD73-154M is a 150 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 510 mA continuous current with a maximum DC resistance of 890 mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is designed for applications requiring fixed inductance in compact form factors.

The SPD73-154M is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this inductor specification.

Substiute Parts

SPD73-154M

API Delevan Inc.In Stock: 975SPD73-154M Datasheet

Current PartRFQ

SRR0745A-151M

Bourns Inc.In Stock: 3947SRR0745A-151M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73-154M is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 150 µH (±20% tolerance band)
• Core material: Ferrite shielded construction
• Mounting type: Surface mount
• Physical footprint: 7.30 × 7.30 mm base dimensions

Secondary Compatibility Criteria:

• Current rating: Minimum 510 mA continuous
• DC resistance: Maximum 890 mOhm
• Saturation current: Minimum 510 mA
• Operating temperature range: Must encompass -55°C to 125°C or be compatible with application requirements

The SRR0745A-151M from Bourns Inc. meets the primary matching criteria with identical inductance, core material, shielding, mounting type, and footprint dimensions. Secondary parameters show acceptable variance within engineering tolerances for equivalent functionality.

Parameter Comparison

Engineering Selection Recommendations

SRR0745A-151M as Primary Substitute:

The SRR0745A-151M is the qualified equivalent for SPD73-154M replacement. Selection is based on the following factors:

1. Electrical Equivalence: Identical inductance value (150 µH) and tolerance (±20%) with ferrite shielded core construction ensure functional compatibility in circuit applications.

2. Physical Compatibility: Matching 7.30 × 7.30 mm footprint enables direct PCB layout reuse. Height difference of 0.80 mm (3.90 mm to 4.70 mm) requires verification of vertical clearance in the assembly.

3. Current Rating Consideration: The SRR0745A-151M continuous current rating of 480 mA is 6% lower than the SPD73-154M specification of 510 mA. Applications operating at or near 510 mA must confirm that 480 mA rating provides adequate margin for the intended duty cycle.

4. Improved DC Resistance: The substitute exhibits 15% lower DC resistance (760 mOhm vs. 890 mOhm), resulting in reduced power dissipation and improved thermal performance.

5. Product Status and Compliance: The SRR0745A-151M is actively manufactured by Bourns Inc. and carries ROHS3 compliance certification, addressing supply continuity and environmental regulatory requirements. The SPD73-154M obsolete status necessitates transition to an active product line.

6. Temperature Range: The substitute operating range (-40°C to 125°C) is narrower at the low temperature extreme. Applications requiring operation below -40°C must retain the original SPD73-154M or identify alternative solutions.

7. Packaging: The SRR0745A-151M is supplied in Tape & Reel format with MSL 1 (Unlimited) moisture sensitivity, supporting automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-151M directly replace the SPD73-154M without PCB modifications?

A: The identical 7.30 × 7.30 mm footprint and surface mount configuration enable direct placement. However, the 0.80 mm height increase (to 4.70 mm maximum) must be verified against PCB assembly clearance requirements, particularly in high-density layouts or applications with height constraints.

Q: What is the impact of the 30 mA lower current rating on the SRR0745A-151M?

A: The SRR0745A-151M continuous current rating of 480 mA is 6% lower than the SPD73-154M specification. Applications operating at sustained currents below 480 mA are unaffected. For applications requiring the full 510 mA rating, the design margin must be re-evaluated to confirm the substitute provides adequate performance without thermal or saturation concerns.

Q: Is the lower DC resistance of the SRR0745A-151M beneficial?

A: Yes. The 760 mOhm maximum DC resistance of the SRR0745A-151M is 15% lower than the SPD73-154M specification of 890 mOhm. This reduction decreases resistive losses, lowers heat generation, and improves overall circuit efficiency. No design modifications are required to accommodate this improvement.

Q: Does the narrower operating temperature range of the SRR0745A-151M affect compatibility?

A: The SRR0745A-151M operates from -40°C to 125°C, compared to the SPD73-154M range of -55°C to 125°C. Applications requiring operation below -40°C cannot use the substitute without additional thermal management or alternative component selection. Verify the minimum operating temperature requirement of your application before substitution.

Q: What are the packaging and supply chain advantages of the SRR0745A-151M?

A: The SRR0745A-151M is actively manufactured by Bourns Inc. and supplied in standard Tape & Reel packaging with MSL 1 moisture sensitivity rating. This ensures consistent availability, supports automated assembly workflows, and eliminates obsolescence risk associated with the SPD73-154M. ROHS3 compliance also aligns with current environmental and regulatory standards.

Q: Are there any electrical performance differences between the two inductors?

A: Both inductors share identical inductance (150 µH), tolerance (±20%), core material (ferrite), and shielding characteristics. The primary electrical difference is the saturation current specification: the SRR0745A-151M saturates at 580 mA compared to 510 mA for the SPD73-154M. This higher saturation point in the substitute provides additional design margin in applications approaching saturation limits.