SPD73-274M 270 µH Shielded Drum Core Inductor

Part Overview

The SPD73-274M is a 270 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 316 mA with a maximum DC resistance of 2.31Ohm. This component features a ferrite core, surface mount packaging, and operates across a temperature range of -55°C to 125°C. The part is currently classified as obsolete, making identification of compatible substitutes essential for ongoing design support and production continuity.

Substiute Parts

SPD73-274M

API Delevan Inc.In Stock: 916SPD73-274M Datasheet

Current PartRFQ

CDRH73NP-271MC-B

Sumida America Components Inc.In Stock: 1107CDRH73NP-271MC-B Datasheet

SimilarRFQ

SRR0745A-271M

Bourns Inc.In Stock: 2040SRR0745A-271M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPD73-274M inductor is determined by alignment of the following critical electrical parameters:

• Inductance Value: 270 µH (exact match required)
• Current Rating: Minimum 316 mA (equal to or greater than the original specification)
• DC Resistance: Maximum 2.31Ohm or lower (controls circuit losses and heat dissipation)
• Shielding: Shielded configuration (required for electromagnetic compatibility)
• Core Material: Ferrite (determines frequency response characteristics)
• Tolerance: ±20% (ensures inductance accuracy within application requirements)
• Mounting Type: Surface Mount (physical assembly compatibility)
• Package Size: 7.30mm x 7.30mm footprint (board layout compatibility)

The identified substitute parts maintain these core specifications while offering improvements in compliance status and, in certain cases, enhanced electrical performance.

Parameter Comparison

Engineering Selection Recommendations

CDRH73NP-271MC-B (Sumida America Components Inc.)

This substitute meets all critical electrical parameters with a current rating of 320 mA, exceeding the original 316 mA specification. It maintains identical inductance (270 µH), tolerance (±20%), and DC resistance (2.31Ohm Max). The component is active in product status and achieves ROHS3 compliance, addressing regulatory requirements. The reduced seated height (3.40mm) may provide board-level integration benefits. Operating temperature range is restricted to -40°C ~ 100°C, which represents a narrower specification than the original part.

SRR0745A-271M (Bourns Inc.)

This substitute provides superior electrical performance with a current rating of 380 mA and reduced DC resistance of 1.2Ohm Max, significantly lowering circuit losses compared to both the original part and the Sumida alternative. The component is active in product status and carries ROHS3 compliance and AEC-Q200 automotive qualification. Operating temperature matches the original specification range (-40°C ~ 125°C). The increased seated height (4.70mm) requires verification against board-level clearance constraints.

Frequently Asked Questions (FAQ)

Q: Can the CDRH73NP-271MC-B be used in applications requiring the full -55°C operating temperature of the original SPD73-274M?

A: No. The CDRH73NP-271MC-B is rated to -40°C minimum, which does not cover the lower temperature extreme of the original specification. Application environments operating below -40°C require alternative selections.

Q: What is the impact of the reduced DC resistance in the SRR0745A-271M?

A: Lower DC resistance (1.2Ohm Max versus 2.31Ohm Max) results in reduced power dissipation and heat generation during circuit operation. This represents an electrical improvement over the original part, with potential benefits for thermal management and efficiency.

Q: Are all three inductors compatible with the same printed circuit board layout?

A: All three parts share the identical 7.30mm x 7.30mm footprint, ensuring board layout compatibility. However, seated heights vary (3.90mm, 3.40mm, and 4.70mm respectively), requiring clearance verification in applications with spatial constraints.

Q: Which substitute should be selected for high-reliability or automotive applications?

A: The SRR0745A-271M carries AEC-Q200 automotive qualification, establishing its suitability for stringent reliability requirements. Both Sumida and Bourns substitutes maintain ROHS3 compliance, whereas the original SPD73-274M is non-compliant.

Q: Is the ±20% inductance tolerance acceptable across all three parts?

A: Yes. All three components maintain identical ±20% inductance tolerance, ensuring consistent circuit performance across the component family within applications designed for this tolerance specification.