SCC5D23-271 Equivalent & Substitute Parts

Part Overview

The SCC5D23-271 is a 270 µH shielded inductor manufactured by Signal Transformer, rated for 320 mA continuous current with a maximum DC resistance of 2.73Ohm. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance within the specified inductance, current rating, and resistance parameters while meeting equivalent environmental and compliance standards.

Key Parameters

Parameter	Value	Unit
Inductance	270	µH
Inductance Tolerance	±20%	%
Current Rating	320	mA
Current - Saturation (Isat)	190	mA
DC Resistance (DCR) Maximum	2.73	Ohm
Shielding	Shielded	—
Mounting Type	Surface Mount	—
Package / Case	Nonstandard	—
Size / Dimension	0.236" L x 0.236" W (6.00mm x 6.00mm)	—
Height - Seated (Max)	0.098" (2.50mm)	—
Operating Temperature Range	-40°C ~ 125°C	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SCC5D23-271 is determined by the following critical parameters:

Inductance Value: 270 µH with ±20% tolerance
Current Rating: Minimum 320 mA continuous current capability
DC Resistance: Maximum 2.73Ohm to maintain thermal and efficiency performance
Shielding: Shielded construction required for EMI containment
Mounting Type: Surface Mount configuration
Package Footprint: Nonstandard 6.00mm x 6.00mm base dimensions with maximum seated height of 2.50mm
Environmental Compliance: ROHS3 compliance and MSL 1 rating required

The PA4300.274NLT meets the core electrical specifications (270 µH inductance, shielded construction, surface mount) and environmental compliance requirements. However, the substitute exhibits reduced current rating (255 mA versus 320 mA) and lower DC resistance (1.52Ohm versus 2.73Ohm maximum), with slightly increased package height (3.00mm versus 2.50mm).

Parameter Comparison

Parameter	SCC5D23-271 (Main Part)	PA4300.274NLT (Substitute)	Compatibility Notes
Inductance	270 µH	270 µH	Matched
Inductance Tolerance	±20%	±20%	Matched
Current Rating (Amps)	320 mA	255 mA	Substitute rated lower; design margin required
DC Resistance (DCR) Maximum	2.73 Ohm	1.52 Ohm	Substitute lower; improved thermal performance
Shielding	Shielded	Shielded	Matched
Mounting Type	Surface Mount	Surface Mount	Matched
Size / Dimension	0.236" L x 0.236" W (6.00mm x 6.00mm)	0.240" L x 0.240" W (6.10mm x 6.10mm)	Footprint compatible within tolerance
Height - Seated (Max)	0.098" (2.50mm)	0.118" (3.00mm)	Substitute 0.50mm taller; verify PCB clearance
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	Matched
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Matched

Engineering Selection Recommendations

The PA4300.274NLT qualifies as a functional substitute for the obsolete SCC5D23-271 based on matched inductance value, tolerance, shielding, mounting type, and environmental compliance certifications. Both components maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and handling compatibility.

Design considerations for substitution:

Current Derating: The substitute part is rated for 255 mA versus the original 320 mA. Applications operating at or near the original 320 mA specification require circuit redesign or component derating analysis to ensure reliability margins.
DC Resistance Improvement: The lower DCR of the substitute (1.52Ohm) reduces resistive losses and heat generation compared to the original specification, providing thermal performance benefit.
Package Height: The 0.50mm increase in seated height (3.00mm versus 2.50mm) requires verification of PCB assembly clearance and solder reflow profile compatibility.
Footprint Tolerance: The 0.10mm increase in lateral dimensions (6.10mm versus 6.00mm) remains within standard PCB layout tolerance and does not preclude direct substitution.

Frequently Asked Questions (FAQ)

Q: Can PA4300.274NLT be used in all applications currently using SCC5D23-271?

A: Direct substitution is valid for applications where the circuit current demand does not exceed 255 mA. Applications requiring the full 320 mA rating of the original part require circuit analysis to confirm adequate design margin with the substitute component.

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

A: Lower DC resistance reduces I²R losses and heat dissipation. This is a performance improvement and does not create compatibility issues. Thermal design margins increase with the substitute part.

Q: Does the increased package height affect PCB assembly?

A: The 0.50mm height increase (2.50mm to 3.00mm) must be verified against PCB clearance requirements, solder reflow profiles, and conformal coating processes if applicable. Standard surface mount assembly processes typically accommodate this variation.

Q: Are both parts equivalent for EMI shielding applications?

A: Both components feature shielded construction. The substitute part uses drum core wirewound construction with ferrite core material, which maintains shielding effectiveness equivalent to the original specification.

Q: What are the compliance and regulatory implications of substitution?

A: Both parts maintain ROHS3 compliance and MSL 1 rating. No additional regulatory documentation or qualification is required for substitution from a compliance perspective.

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