SCB75C-330 Equivalent & Substitute Parts

Part Overview

The SCB75C-330 is a 33 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 1.52 A continuous current with a maximum DC resistance of 170mOhm. This component is designed for applications requiring fixed inductance in compact form factors with electromagnetic shielding. The part maintains Active product status with full RoHS3 and REACH compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this inductance category.

Key Parameters

Parameter	Value	Unit
Inductance	33	µH
Inductance Tolerance	±20%	—
Current Rating	1.52	A
DC Resistance (Max)	170	mOhm
Saturation Current	840	mA
Shielding	Shielded	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-40 to 125	°C
Inductance Test Frequency	1	kHz
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SCB75C-330 is determined by the following critical parameters:

Inductance Value: Must be 33 µH with ±20% tolerance
Shielding Configuration: Must be shielded to maintain electromagnetic isolation
Mounting Technology: Must be surface mount compatible
Current Rating: Substitute must support minimum 1.52 A continuous operation
DC Resistance: Substitute DCR must not exceed 170mOhm to maintain thermal and efficiency characteristics
Operating Temperature: Must support -40°C to 125°C range
Compliance: Must maintain RoHS3 and REACH compliance status

The SRR0745A-330M from Bourns Inc. meets all substitution criteria within these parameter boundaries.

Parameter Comparison

Parameter	SCB75C-330 (Signal Transformer)	SRR0745A-330M (Bourns Inc.)	Compatibility
Inductance	33 µH	33 µH	Matched
Inductance Tolerance	±20%	±20%	Matched
Current Rating	1.52 A	1.35 A	Substitute rated lower; verify application requirements
Saturation Current	840 mA	1.45 A	Substitute rated higher
DC Resistance (Max)	170 mOhm	150 mOhm	Substitute rated lower (improved)
Shielding	Shielded	Shielded	Matched
Mounting Type	Surface Mount	Surface Mount	Matched
Operating Temperature	-40 to 125°C	-40 to 125°C	Matched
Inductance Test Frequency	1 kHz	1 kHz	Matched
Size / Dimension	7.40mm x 7.40mm	7.30mm x 7.30mm	Functionally equivalent footprint
Height (Max)	5.50 mm	4.70 mm	Substitute is lower profile
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Matched
Product Status	Active	Active	Both actively manufactured

Engineering Selection Recommendations

The SRR0745A-330M qualifies as a direct substitute for the SCB75C-330 based on matched electrical specifications and compliance certifications. Both components are Active products with ROHS3 and REACH compliance. The substitute exhibits improved DC resistance (150mOhm vs. 170mOhm maximum) and higher saturation current (1.45A vs. 840mA), providing enhanced performance margins. The primary consideration is the current rating differential: the substitute is rated for 1.35 A continuous versus the original 1.52 A. Applications operating at or near the 1.52 A specification should be evaluated against the substitute's 1.35 A rating. The SRR0745A-330M also provides a lower profile (4.70mm vs. 5.50mm seated height), which may offer layout advantages in space-constrained designs. Both components maintain identical inductance tolerance, operating temperature range, and moisture sensitivity classification.

Frequently Asked Questions (FAQ)

Q: Can the SRR0745A-330M replace the SCB75C-330 in all applications?

A: The SRR0745A-330M is electrically and mechanically compatible for applications operating below 1.35 A continuous current. Applications requiring the full 1.52 A rating of the original part require evaluation of actual current draw against the substitute's 1.35 A specification.

Q: What are the physical compatibility considerations?

A: Both components use surface mount technology with functionally equivalent footprints (7.40mm vs. 7.30mm). The SRR0745A-330M has a lower seated height (4.70mm vs. 5.50mm), which is compatible with standard PCB assembly processes and may provide layout benefits.

Q: Are there compliance differences between these parts?

A: Both parts maintain identical RoHS3 and REACH compliance status. Moisture sensitivity levels are matched at MSL 1 (Unlimited). No compliance barriers exist for substitution.

Q: How do the DC resistance specifications compare?

A: The SRR0745A-330M has a maximum DC resistance of 150mOhm compared to the SCB75C-330's 170mOhm maximum. The lower resistance of the substitute reduces power dissipation and thermal generation, representing an improvement over the original specification.

Q: What is the saturation current difference, and does it matter?

A: The SRR0745A-330M has a saturation current of 1.45 A versus 840mA for the SCB75C-330. Higher saturation current in the substitute provides greater margin before inductance degradation occurs at elevated current levels.

Q: Are both parts currently available?

A: Both components maintain Active product status. The SCB75C-330 has 963 pieces in stock, while the SRR0745A-330M has 950,300 pieces available, indicating strong supply availability for the substitute.

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