SPD73R-184M Equivalent & Substitute Parts

Part Overview

The SPD73R-184M is a 180 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., designed for surface mount applications requiring moderate current handling and low DC resistance. This component operates across an industrial temperature range of -55°C to 125°C and is RoHS3 compliant. The part is currently active in production with 857 pieces available in inventory. Substitute parts may be required due to supply constraints, lead time considerations, or specific application requirements within the defined electrical and mechanical parameter space.

Key Parameters

Parameter	Value	Unit
Inductance	180	µH
Inductance Tolerance	±20	%
Current Rating	620	mA
DC Resistance (Max)	1.45	Ohm
Shielding	Shielded	—
Core Material	Ferrite	—
Mounting Type	Surface Mount	—
Package Dimensions	7.30 x 7.30 x 3.90	mm
Operating Temperature	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73R-184M is determined by strict alignment with the following critical parameters:

Mandatory Matching Parameters:

Inductance value: 180 µH
Inductance tolerance: ±20%
Core material: Ferrite
Shielding: Shielded
Mounting type: Surface Mount
Package footprint: 7.30 x 7.30 mm
RoHS compliance: ROHS3 Compliant

Allowable Variation Parameters:

Current rating: Substitute must meet or exceed 620 mA requirement
DC resistance: Substitute must not exceed 1.45 Ohm maximum
Operating temperature range: Substitute must cover or exceed -55°C to 125°C
Physical height: Substitute must fit within board assembly constraints

The SRR0745A-181M from Bourns Inc. qualifies as a substitute based on matching inductance, tolerance, core material, shielding, mounting type, and footprint dimensions. Variations in current rating, DC resistance, and operating temperature range are within acceptable engineering parameters for this application category.

Parameter Comparison

Parameter	SPD73R-184M (API Delevan)	SRR0745A-181M (Bourns)	Compatibility
Inductance	180 µH	180 µH	Match
Inductance Tolerance	±20%	±20%	Match
Current Rating	620 mA	460 mA	Substitute lower
Current - Saturation	620 mA	540 mA	Substitute lower
DC Resistance (Max)	1.45 Ohm	0.82 Ohm	Substitute lower
Core Material	Ferrite	Ferrite	Match
Shielding	Shielded	Shielded	Match
Mounting Type	Surface Mount	Surface Mount	Match
Package Footprint	7.30 x 7.30 mm	7.30 x 7.30 mm	Match
Height (Max)	3.90 mm	4.70 mm	Substitute higher
Operating Temperature	-55 to 125°C	-40 to 125°C	Substitute narrower
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Match

Engineering Selection Recommendations

SPD73R-184M Selection Criteria:

Applications requiring maximum current rating of 620 mA
Circuits operating at temperatures below -40°C
Designs where DC resistance must not exceed 1.45 Ohm
Systems requiring the full -55°C to 125°C operating range
Designs with strict height constraints (3.90 mm maximum)

SRR0745A-181M Selection Criteria:

Applications with current requirements up to 460 mA
Circuits operating within -40°C to 125°C temperature range
Designs benefiting from lower DC resistance (0.82 Ohm)
Assemblies where additional height (4.70 mm) is acceptable
Systems requiring AEC-Q200 automotive qualification

Both parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating. Selection between these components depends on specific circuit current demands and thermal operating conditions. The SRR0745A-181M offers improved DC resistance characteristics, while the SPD73R-184M provides higher current capacity and extended low-temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-181M replace the SPD73R-184M in all applications?

A: No. The SRR0745A-181M has a maximum current rating of 460 mA compared to the SPD73R-184M's 620 mA rating. Substitution is only valid for circuits drawing 460 mA or less. Additionally, the SRR0745A-181M operates down to -40°C, not -55°C, limiting use in extended low-temperature environments.

Q: Are the package footprints identical?

A: The lateral footprints are identical at 7.30 x 7.30 mm. However, the SRR0745A-181M has a maximum seated height of 4.70 mm versus 3.90 mm for the SPD73R-184M. Board clearance and component stacking must be verified before substitution.

Q: What is the significance of the lower DC resistance in the SRR0745A-181M?

A: Lower DC resistance (0.82 Ohm vs. 1.45 Ohm) reduces resistive losses and heat generation during operation. This can improve circuit efficiency and thermal performance in current-limited applications.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control. The SRR0745A-181M carries additional AEC-Q200 automotive qualification, which the SPD73R-184M does not specify.

Q: What is the inductance tolerance for both parts?

A: Both the SPD73R-184M and SRR0745A-181M maintain ±20% inductance tolerance at 1 kHz test frequency, ensuring equivalent circuit performance in this parameter.

Q: Can these parts be used interchangeably in high-current applications?

A: No. Applications requiring sustained current above 460 mA must use the SPD73R-184M. The SRR0745A-181M saturation current of 540 mA limits its use in high-current designs.

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