SPD73R-103M Equivalent & Substitute Parts

Part Overview

The SPD73R-103M is a 10 µH shielded drum core wirewound inductor manufactured by API Delevan Inc., rated for 2.5 A continuous current with a maximum DC resistance of 67 mOhm. This component is designed for surface mount applications requiring electromagnetic shielding in compact form factors. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance can be maintained across critical parameters including inductance value, current rating, shielding characteristics, and operating temperature range, while accommodating minor variations in DC resistance and physical dimensions within acceptable engineering tolerances.

Key Parameters

Parameter	SPD73R-103M
Inductance	10 µH
Inductance Tolerance	±20%
Current Rating (Continuous)	2.5 A
Current - Saturation (Isat)	2.5 A
DC Resistance (DCR) Maximum	67 mOhm
Shielding	Shielded
Core Material	Ferrite
Operating Temperature Range	-55°C to 125°C
Mounting Type	Surface Mount
Package Dimensions	7.30 mm × 7.30 mm × 3.90 mm (max height)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SPD73R-103M is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Inductance value: 10 µH with ±20% tolerance
Shielding: Shielded construction required
Core material: Ferrite
Mounting type: Surface Mount
Package footprint: 7.30 mm × 7.30 mm base dimensions
Moisture sensitivity: MSL 1 or better
RoHS compliance: ROHS3 or equivalent

Allowable Variation Parameters:

Current rating: Minimum 2.1 A (substitute may be lower than 2.5 A if application permits)
DC resistance: Up to 52 mOhm (lower resistance is acceptable)
Saturation current: 2.5 A or higher
Operating temperature: -40°C to 125°C minimum (narrower range acceptable if application requirements are met)
Height: Up to 4.70 mm (within PCB assembly constraints)

The SRR0745A-100M meets all mandatory equivalence criteria and falls within allowable variation parameters for DC resistance and current rating.

Parameter Comparison

Parameter	SPD73R-103M (API Delevan)	SRR0745A-100M (Bourns)	Compatibility
Inductance	10 µH	10 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating (Continuous)	2.5 A	2.1 A	Substitute rated lower; acceptable if application current ≤ 2.1 A
Current - Saturation (Isat)	2.5 A	2.5 A	Equivalent
DC Resistance (DCR) Maximum	67 mOhm	52 mOhm	Substitute has lower resistance; acceptable
Shielding	Shielded	Shielded	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Operating Temperature Range	-55°C to 125°C	-40°C to 125°C	Substitute range narrower; acceptable if application operates ≥ -40°C
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Footprint	7.30 mm × 7.30 mm	7.30 mm × 7.30 mm	Equivalent
Height - Seated (Max)	3.90 mm	4.70 mm	Substitute 0.80 mm taller; acceptable if PCB clearance permits
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Equivalent
Product Status	Active	Active	Both in active production

Engineering Selection Recommendations

SPD73R-103M (Primary Selection):

Select when continuous current requirement is 2.1 A to 2.5 A
Select when operating temperature range must include -55°C to -40°C
Select when PCB height clearance is limited to 3.90 mm maximum
Select when maximum DC resistance specification is critical at 67 mOhm

SRR0745A-100M (Substitute Selection):

Select when continuous current requirement is 2.1 A or lower
Select when operating temperature range minimum of -40°C is acceptable
Select when PCB height clearance permits up to 4.70 mm
Select when lower DC resistance (52 mOhm) provides circuit performance benefit
Select when Bourns supply chain or lead time is preferred
Select when AEC-Q200 automotive qualification is required

Both parts maintain ROHS3 compliance, MSL 1 rating, and active production status. Selection between these parts depends on application-specific constraints regarding current, temperature, and physical dimensions.

Frequently Asked Questions (FAQ)

Q: Can SRR0745A-100M replace SPD73R-103M in all applications?

A: Substitution is valid only when three conditions are met: (1) continuous current requirement does not exceed 2.1 A, (2) minimum operating temperature is -40°C or higher, and (3) PCB assembly clearance accommodates 4.70 mm component height. If any condition is not met, substitution is not appropriate.

Q: What is the impact of the 15 mOhm DC resistance difference?

A: The SRR0745A-100M has 52 mOhm maximum DCR compared to 67 mOhm for SPD73R-103M. Lower resistance reduces power dissipation and heat generation. This difference is beneficial in most applications and does not create compatibility issues.

Q: Are the inductance values truly identical?

A: Both parts are specified at 10 µH with ±20% tolerance. Inductance is measured at different frequencies (SPD73R-103M at 100 kHz, SRR0745A-100M at 1 kHz), which may result in slight measurement variations. For circuit design purposes, both parts are treated as 10 µH inductors within ±20% tolerance.

Q: Does the height difference of 0.80 mm affect PCB layout?

A: The SRR0745A-100M is 0.80 mm taller (4.70 mm vs. 3.90 mm). Verify available vertical clearance on the PCB assembly. If clearance is constrained, SPD73R-103M is required. If clearance is available, the height difference does not affect electrical performance.

Q: What does AEC-Q200 qualification on the Bourns part mean?

A: AEC-Q200 is an automotive industry qualification standard. The SRR0745A-100M carries this certification; the SPD73R-103M does not. If automotive qualification is a requirement, SRR0745A-100M is the appropriate selection.

Q: Can I use SPD73R-103M in applications rated for -40°C minimum?

A: Yes. SPD73R-103M operates from -55°C to 125°C, which exceeds the -40°C minimum requirement. The wider temperature range of SPD73R-103M provides additional margin.

Q: Are packaging formats interchangeable?

A: SPD73R-103M is supplied in Tape & Reel (TR) format; SRR0745A-100M is supplied in Cut Tape (CT) & Digi-Reel format. Both are surface mount compatible. Packaging format affects procurement and assembly processes but not electrical or mechanical compatibility on the PCB.

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