SPD73R-183M Equivalent & Substitute Parts

Part Overview

The SPD73R-183M is a 18 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 1.8 A continuous current with a maximum DC resistance of 140 mOhm. This component is designed for surface mount applications in compact form factors and is currently in active production status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Inductance	18	µH	Critical - Must match exactly
Inductance Tolerance	±20%	%	Critical - Defines acceptable range
Current Rating	1.8	A	Critical - Minimum thermal requirement
DC Resistance (DCR)	140	mOhm Max	Important - Affects power dissipation
Shielding	Shielded	-	Critical - EMI containment requirement
Package Dimensions	7.30 x 7.30 mm	mm	Critical - PCB footprint compatibility
Mounting Type	Surface Mount	-	Critical - Assembly process requirement
Operating Temperature Range	-55 to 125	°C	Important - Environmental specification
RoHS Status	ROHS3 Compliant	-	Important - Regulatory compliance

Substitute Part Grouping Explanation

Substitute parts for the SPD73R-183M are qualified based on the following criteria:

Electrical Parameters (Critical):

Inductance value of 18 µH with ±20% tolerance
Current rating of 1.8 A or higher
Shielded construction for electromagnetic containment
DC resistance within acceptable limits for thermal performance

Mechanical Parameters (Critical):

Surface mount package type
Footprint dimensions of 7.30 x 7.30 mm (0.287" x 0.287")
Nonstandard package classification
Tape & Reel packaging format

Compliance Parameters (Important):

ROHS3 compliance status
Operating temperature range compatibility
Moisture sensitivity level MSL 1 (Unlimited)

The SRR0745A-180M qualifies as a substitute based on matching inductance, current rating, shielding requirement, footprint dimensions, and packaging format. Variations in DC resistance and saturation current are within acceptable engineering tolerances for this application category.

Parameter Comparison

Parameter	SPD73R-183M (Main)	SRR0745A-180M (Substitute)	Compatibility
Manufacturer	API Delevan Inc.	Bourns Inc.	Different manufacturer
Inductance	18 µH	18 µH	Identical
Inductance Tolerance	±20%	±20%	Identical
Current Rating	1.8 A	1.8 A	Identical
Current - Saturation	1.8 A	1.95 A	Substitute rated higher
DC Resistance (Max)	140 mOhm	90 mOhm	Substitute lower (better)
Shielding	Shielded	Shielded	Identical
Package Dimensions	7.30 x 7.30 mm	7.30 x 7.30 mm	Identical
Height (Max)	3.90 mm	4.70 mm	Substitute 0.80 mm taller
Mounting Type	Surface Mount	Surface Mount	Identical
Operating Temperature	-55 to 125 °C	-40 to 125 °C	Substitute narrower range
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Identical
Product Status	Active	Active	Both in production
Ratings	-	AEC-Q200	Substitute has automotive qualification

Engineering Selection Recommendations

Primary Part (SPD73R-183M): Use when API Delevan sourcing is specified, when the extended low-temperature operating range (-55°C) is required, or when the lower profile height (3.90 mm) is a PCB layout constraint.

Substitute Part (SRR0745A-180M): Use when Bourns sourcing is preferred, when lower DC resistance (90 mOhm vs 140 mOhm) reduces thermal dissipation requirements, or when AEC-Q200 automotive qualification is required. The substitute is suitable for applications where the operating temperature minimum of -40°C is acceptable and the increased height of 4.70 mm does not create PCB clearance conflicts.

Both parts maintain identical electrical performance for the specified 18 µH inductance and 1.8 A current rating. Selection between them is determined by supply chain availability, thermal design requirements, and environmental temperature specifications of the end application.

Frequently Asked Questions (FAQ)

Q: Can SRR0745A-180M be used as a direct replacement for SPD73R-183M?

A: Yes, for applications where the operating temperature range of -40 to 125°C is acceptable and the increased component height of 4.70 mm does not conflict with PCB layout. Both parts provide identical inductance (18 µH) and current rating (1.8 A) with shielded construction and matching footprint dimensions (7.30 x 7.30 mm).

Q: What is the significance of the lower DC resistance in the substitute part?

A: The SRR0745A-180M has a maximum DC resistance of 90 mOhm compared to 140 mOhm in the SPD73R-183M. Lower DC resistance reduces I²R power dissipation and heat generation during operation, which can improve thermal performance in current-limited applications.

Q: Are there height clearance considerations when substituting?

A: Yes. The SPD73R-183M has a seated height of 3.90 mm maximum, while the SRR0745A-180M is 4.70 mm maximum. Verify that the additional 0.80 mm height does not interfere with adjacent components or enclosure constraints on the PCB.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (Unlimited moisture sensitivity). The substitute part additionally carries AEC-Q200 automotive qualification, which is not specified for the main part.

Q: What is the minimum operating temperature difference between these parts?

A: The SPD73R-183M operates from -55°C minimum, while the SRR0745A-180M operates from -40°C minimum. Applications requiring operation below -40°C must use the SPD73R-183M.

Q: Are the inductance tolerances identical?

A: Yes. Both parts are specified with ±20% inductance tolerance at 1 kHz test frequency, ensuring equivalent circuit performance within the same acceptable range.

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