SPD73R-274M Equivalent & Substitute Parts

Part Overview

The SPD73R-274M is a 270 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 520 mA with a maximum DC resistance of 2.31Ohm. This surface mount component operates across the temperature range of -55°C to 125°C and is ROHS3 compliant. The part is currently active in production with 825 pieces available in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this product category.

Substiute Parts

SPD73R-274M

API Delevan Inc.In Stock: 915SPD73R-274M Datasheet

Current PartRFQ

SRR0745A-271M

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

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73R-274M is determined by the following critical parameters:

Inductance value must match at 270 µH with ±20% tolerance specification. Shielding type must be shielded to maintain electromagnetic isolation equivalent to the original design. Core material must be ferrite to ensure consistent magnetic properties. Mounting type must be surface mount to maintain PCB assembly compatibility. Package footprint must be 7.30mm x 7.30mm to ensure mechanical fit within the designated board space. Current rating and saturation current must meet or exceed the application requirements. DC resistance must not exceed the maximum specified value to prevent excessive power dissipation. Operating temperature range must encompass the application environment. RoHS and regulatory compliance status must be maintained.

The SRR0745A-271M from Bourns Inc. meets these substitution criteria with matching inductance, shielding, core material, mounting type, and package dimensions.

Parameter Comparison

Engineering Selection Recommendations

Both the SPD73R-274M and SRR0745A-271M are active production components with ROHS3 compliance and unlimited moisture sensitivity ratings. The SRR0745A-271M offers lower DC resistance at 1.2Ohm compared to 2.31Ohm, resulting in reduced power dissipation. However, the current rating of the SRR0745A-271M is 380 mA, which is lower than the SPD73R-274M at 520 mA. Selection between these parts depends on application current requirements. The SPD73R-274M supports operation down to -55°C, while the SRR0745A-271M operates from -40°C. The seated height difference of 0.80mm must be verified for PCB clearance compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-271M replace the SPD73R-274M in all applications?

A: Substitution is valid only when the application current requirement does not exceed 380 mA. The SRR0745A-271M has a lower current rating and saturation current than the SPD73R-274M. If the circuit requires the full 520 mA capability of the original part, the SRR0745A-271M is not suitable.

Q: What is the impact of the different DC resistance values?

A: The SRR0745A-271M has a maximum DC resistance of 1.2Ohm compared to 2.31Ohm for the SPD73R-274M. Lower DC resistance reduces I²R power losses in the inductor. This difference must be evaluated based on the specific circuit operating conditions and thermal requirements.

Q: Are there mechanical compatibility concerns?

A: Both parts share the same footprint of 7.30mm x 7.30mm and are surface mount components. The SRR0745A-271M has a maximum seated height of 4.70mm versus 3.90mm for the SPD73R-274M. Verify that the additional 0.80mm height does not conflict with PCB layout constraints or component clearances.

Q: What is the temperature range difference?

A: The SPD73R-274M operates from -55°C to 125°C, while the SRR0745A-271M operates from -40°C to 125°C. If the application requires operation below -40°C, the SPD73R-274M must be used.

Q: Are both parts RoHS compliant?

A: Yes, both the SPD73R-274M and SRR0745A-271M are ROHS3 compliant with unlimited moisture sensitivity levels, meeting current regulatory requirements for electronic component manufacturing.