SCPH73B-680 Equivalent & Substitute Parts

Part Overview

The SCPH73B-680 is a 68 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications requiring moderate current handling and low DC resistance. This component is classified as Active product status with full RoHS3 compliance. Substitute parts become necessary when addressing supply chain constraints, lead time requirements, or specific application performance parameters while maintaining electrical and mechanical compatibility within the defined tolerance ranges.

Key Parameters

Parameter	Value	Unit
Inductance	68	µH
Inductance Tolerance	±20%	—
Current Rating	840	mA
DC Resistance (DCR)	520	mOhm Max
Shielding	Shielded	—
Operating Temperature Range	-40°C to 125°C	—
Mounting Type	Surface Mount	—
Package Type	Nonstandard	—
Size	7.50mm x 7.50mm x 3.80mm	L x W x H
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SCPH73B-680 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Inductance value: 68 µH (within ±20% tolerance band)
Shielding requirement: Shielded construction mandatory
Mounting configuration: Surface mount only
Operating temperature range: -40°C to 125°C minimum
RoHS3 compliance: Required

Allowable Variation Parameters:

Current rating: Substitute must meet or exceed 840 mA
DC resistance: Substitute must not exceed 520 mOhm
Physical dimensions: Nonstandard package with height ≤ 3.80mm seated maximum
Saturation current: Substitute must support minimum 540 mA saturation

The SRR0735A-680M qualifies as a direct substitute based on matching inductance, shielding, temperature range, and compliance certifications while providing improved current handling and reduced DC resistance characteristics.

Parameter Comparison

Parameter	SCPH73B-680 (Main)	SRR0735A-680M (Substitute)	Compatibility
Inductance	68 µH	68 µH	Match
Inductance Tolerance	±20%	±20%	Match
Current Rating	840 mA	720 mA	Main exceeds substitute by 120 mA
Saturation Current (Isat)	540 mA	740 mA	Substitute exceeds main by 200 mA
DC Resistance (DCR)	520 mOhm Max	400 mOhm Max	Substitute 23% lower
Shielding	Shielded	Shielded	Match
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Match
Mounting Type	Surface Mount	Surface Mount	Match
Package Type	Nonstandard	Nonstandard	Match
Size (L x W)	7.50mm x 7.50mm	7.30mm x 7.30mm	Substitute 2.7% smaller footprint
Height Seated (Max)	3.80mm	3.70mm	Substitute 2.6% lower profile
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Match
REACH Status	REACH Unaffected	REACH Unaffected	Match

Engineering Selection Recommendations

The SRR0735A-680M is qualified as a direct substitute for the SCPH73B-680 based on the following engineering criteria:

Compliance & Certification Alignment: Both components maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity classification (MSL 1). The substitute carries AEC-Q200 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Electrical Performance: The substitute delivers superior DC resistance performance at 400 mOhm maximum versus 520 mOhm maximum, resulting in 23% lower resistive losses. Saturation current of 740 mA exceeds the main part's 540 mA specification. The rated current of 720 mA is 120 mA lower than the main part's 840 mA rating; this differential must be evaluated against actual circuit current requirements.

Physical Compatibility: The substitute's smaller footprint (7.30mm x 7.30mm versus 7.50mm x 7.50mm) and lower profile (3.70mm versus 3.80mm) provide layout flexibility while maintaining nonstandard package classification. Both components are surface mount with identical temperature operating ranges.

Supply & Availability: The substitute maintains significantly higher inventory availability (5585 pieces versus 798 pieces), supporting production continuity and lead time reduction.

Frequently Asked Questions (FAQ)

Q: Can the SRR0735A-680M replace the SCPH73B-680 in all applications?

A: Substitution is valid when circuit current requirements do not exceed 720 mA. The substitute's 120 mA lower current rating must be verified against actual application load. All other electrical parameters (inductance, tolerance, temperature range, shielding) are equivalent or superior.

Q: What is the impact of the 120 mOhm DC resistance difference?

A: The substitute's lower DC resistance (400 mOhm versus 520 mOhm) reduces resistive heating and improves efficiency. This is a performance advantage with no negative impact on substitution compatibility.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: The substitute is 2.7% smaller in footprint and 2.6% lower in profile. Existing PCB layouts designed for the SCPH73B-680 will accommodate the SRR0735A-680M without modification. Verify clearance for any height-constrained applications.

Q: What certifications does the substitute carry?

A: The SRR0735A-680M carries AEC-Q200 automotive qualification in addition to ROHS3 and REACH compliance. Both components maintain MSL 1 (unlimited moisture sensitivity level).

Q: Is the packaging format compatible?

A: The main part uses standard SMD packaging while the substitute is supplied in Tape & Reel format. Both are surface mount nonstandard packages suitable for automated assembly processes.

Q: What is the inductance tolerance specification for both parts?

A: Both components specify ±20% inductance tolerance at 1 kHz test frequency, ensuring equivalent circuit performance within the tolerance band.

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