SCRH127-330 Equivalent & Substitute Parts

Part Overview

The SCRH127-330 is a 33 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 3.24 A continuous current with a maximum DC resistance of 64.8mOhm. This component is designed for applications requiring fixed inductance in compact form factors with electromagnetic shielding. The part is currently in active production status with 1066 pieces available in inventory.

Substitute parts become necessary when the primary manufacturer part experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical tolerances of alternative qualified components.

Key Parameters

Parameter	Value	Unit
Inductance	33	µH
Inductance Tolerance	±20%	%
Current Rating	3.24	A
DC Resistance (Max)	64.8	mOhm
Shielding	Shielded	—
Operating Temperature Range	-40°C to 125°C	°C
Mounting Type	Surface Mount	—
Package Type	Nonstandard	—
Physical Dimensions	12.50mm × 12.50mm × 8.00mm (max height)	mm
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SCRH127-330 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Inductance value: 33 µH (within ±20% tolerance band)
DC resistance: 64.8mOhm maximum
Current rating: minimum 3.24 A continuous
Shielding: required (shielded construction)
Mounting: Surface Mount only
Physical footprint: compatible with 12.50mm × 12.50mm × 8.00mm maximum envelope
Inductance test frequency: 1 kHz

The CDRH127NP-330MC from Sumida America Components Inc. qualifies as a manufacturer-recommended substitute based on matching inductance, tolerance, DC resistance, shielding type, and mounting configuration. Dimensional compatibility and operating temperature range differences are noted in the parameter comparison table below.

Parameter Comparison

Parameter	SCRH127-330 (Signal Transformer)	CDRH127NP-330MC (Sumida)	Compatibility Notes
Inductance	33 µH	33 µH	Identical
Inductance Tolerance	±20%	±20%	Identical
Current Rating (Amps)	3.24 A	3 A	Substitute rated 0.24 A lower; verify application thermal requirements
DC Resistance (Max)	64.8 mOhm	64.8 mOhm	Identical
Shielding	Shielded	Shielded	Identical
Operating Temperature Range	-40°C to 125°C	-40°C to 100°C	Substitute upper limit 25°C lower; verify application temperature profile
Mounting Type	Surface Mount	Surface Mount	Identical
Physical Dimensions (L × W)	12.50mm × 12.50mm	12.00mm × 12.00mm	Substitute 0.50mm smaller in both length and width; footprint compatible
Height (Max)	8.00mm	8.00mm	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
Inductance Test Frequency	1 kHz	1 kHz	Identical

Engineering Selection Recommendations

SCRH127-330 (Primary): Select when supply is available and application operates within the full -40°C to 125°C temperature range. This part provides maximum current headroom at 3.24 A and the widest thermal operating window.

CDRH127NP-330MC (Substitute): Select when SCRH127-330 availability is constrained. This substitute is qualified for applications where:

Operating temperature does not exceed 100°C
Continuous current demand does not exceed 3 A
PCB footprint accommodates the slightly smaller 12.00mm × 12.00mm body

Both parts maintain ROHS3 compliance and identical inductance, tolerance, and DC resistance specifications. The substitute carries higher inventory availability (427,200 pieces) and is packaged in Cut Tape and Digi-Reel formats, offering logistics flexibility.

Frequently Asked Questions (FAQ)

Q: Can CDRH127NP-330MC replace SCRH127-330 in all applications?

A: No. The substitute is qualified only for applications where continuous operating current does not exceed 3 A and ambient temperature remains below 100°C. If your design requires the full 3.24 A rating or operates above 100°C, the primary SCRH127-330 must be used.

Q: Are the physical dimensions compatible on the PCB?

A: Yes. The CDRH127NP-330MC measures 12.00mm × 12.00mm compared to the SCRH127-330 at 12.50mm × 12.50mm. The substitute is smaller and will fit within the same footprint area. Both share identical 8.00mm maximum height.

Q: Do both parts have the same inductance tolerance?

A: Yes. Both SCRH127-330 and CDRH127NP-330MC are specified at ±20% inductance tolerance and tested at 1 kHz, ensuring equivalent circuit performance within the tolerance band.

Q: What is the difference in packaging between these parts?

A: SCRH127-330 is supplied in Tape & Reel (TR) format. CDRH127NP-330MC is available in Cut Tape (CT) and Digi-Reel formats, providing alternative handling and automation options.

Q: Are there compliance or regulatory differences?

A: Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity. CDRH127NP-330MC carries REACH Affected status, while SCRH127-330 is REACH Unaffected. Verify REACH compliance requirements for your end application and region.

Q: What is the DC resistance specification, and is it identical?

A: Both parts specify 64.8mOhm maximum DC resistance, measured at 1 kHz. This parameter is critical for thermal and efficiency calculations and is identical between primary and substitute.

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