SCB63C-271 Equivalent & Substitute Parts

Part Overview

The SCB63C-271 is a 270 µH shielded inductor manufactured by Signal Transformer, designed for surface mount applications with a current rating of 360 mA and maximum DC resistance of 1.96Ohm. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. Substitute parts must maintain the same inductance value, shielding characteristics, and operating temperature range while accommodating minor variations in current rating and DC resistance within acceptable engineering tolerances.

Key Parameters

Parameter	Value
Inductance	270 µH
Inductance Tolerance	±20%
Current Rating	360 mA
DC Resistance (DCR)	1.96Ohm Max
Shielding	Shielded
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Surface Mount
Package Type	Nonstandard
Physical Dimensions	0.244" L x 0.244" W (6.20mm x 6.20mm)
Height - Seated (Max)	0.118" (3.00mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SCB63C-271 is based on the following critical parameters:

Inductance Value: Must be 270 µH with ±20% tolerance to maintain circuit performance
Shielding: Must be shielded to preserve electromagnetic isolation characteristics
Operating Temperature Range: Must support -40°C ~ 125°C minimum
Mounting Type: Must be surface mount compatible
Physical Footprint: Dimensions must be compatible with 6.20mm x 6.20mm (0.244" x 0.244") layout constraints and 3.00mm maximum height
Current Handling: Substitute must support minimum 255 mA operation; the original 360 mA rating establishes the upper design margin

The PA4300.274NLT from Pulse Electronics meets these substitution criteria with equivalent inductance, shielding, temperature range, and compatible physical dimensions. Minor variations in DC resistance (1.52Ohm vs. 1.96Ohm) and current saturation characteristics fall within acceptable engineering tolerances for this component category.

Parameter Comparison

Parameter	SCB63C-271 (Signal Transformer)	PA4300.274NLT (Pulse Electronics)
Inductance	270 µH	270 µH
Inductance Tolerance	±20%	±20%
Current Rating (Amps)	360 mA	255 mA
DC Resistance (DCR)	1.96Ohm Max	1.52Ohm Max
Shielding	Shielded	Shielded
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount
Physical Dimensions	0.244" L x 0.244" W (6.20mm x 6.20mm)	0.240" L x 0.240" W (6.10mm x 6.10mm)
Height - Seated (Max)	0.118" (3.00mm)	0.118" (3.00mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The PA4300.274NLT is the qualified substitute for the obsolete SCB63C-271. Both components maintain identical inductance specifications, shielding characteristics, and operating temperature ranges. The substitute offers the advantage of active product status with confirmed inventory availability, ensuring long-term procurement viability.

The PA4300.274NLT exhibits lower DC resistance (1.52Ohm vs. 1.96Ohm maximum), which reduces power dissipation in the inductor. The current rating of 255 mA on the substitute is lower than the original 360 mA specification; circuit designs must confirm that operating current does not exceed 255 mA to maintain compliance with the substitute component's ratings.

Both components are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard manufacturing and storage protocols. Physical dimensions are nearly identical with negligible differences (6.10mm vs. 6.20mm), confirming PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can the PA4300.274NLT directly replace the SCB63C-271 in existing designs?

A: Direct substitution is possible when circuit operating current remains below 255 mA. The lower current rating of the substitute must be verified against actual circuit requirements. All other electrical and mechanical parameters are equivalent.

Q: What is the impact of the lower DC resistance in the PA4300.274NLT?

A: Lower DC resistance (1.52Ohm vs. 1.96Ohm) reduces resistive losses and heat generation in the inductor. This is a beneficial characteristic that improves efficiency and does not create compatibility issues.

Q: Are there any PCB layout considerations when switching from SCB63C-271 to PA4300.274NLT?

A: Physical dimensions are nearly identical (6.20mm vs. 6.10mm footprint). Both components have the same maximum seated height of 3.00mm. Existing PCB layouts designed for the SCB63C-271 will accommodate the PA4300.274NLT without modification.

Q: What certifications and compliance standards apply to both components?

A: Both the SCB63C-271 and PA4300.274NLT are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (Unlimited) for moisture sensitivity. Both carry EAR99 export classification.

Q: Why is the SCB63C-271 listed as obsolete?

A: Obsolete status indicates the component is no longer manufactured by Signal Transformer. The PA4300.274NLT from Pulse Electronics provides functional equivalence with active product status and confirmed availability.

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