SCR63B-330 Equivalent & Substitute Parts

Part Overview

The SCR63B-330 is a 33 µH shielded inductor manufactured by Signal Transformer, rated for 890 mA continuous current with a maximum DC resistance of 410 mOhm. This component is designed for surface mount applications in nonstandard packaging. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain the specified inductance value, current rating, and operating temperature range while accommodating variations in shielding type and DC resistance within acceptable design tolerances.

Substiute Parts

SCR63B-330

Signal TransformerIn Stock: 1039SCR63B-330 Datasheet

Current PartRFQ

74404063330

Würth ElektronikIn Stock: 620874404063330 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCR63B-330 is based on the following critical parameters:

• Inductance Value: 33 µH with ±20% tolerance
• Current Rating: Minimum 890 mA continuous current capability
• Saturation Current (Isat): Minimum 610 mA
• DC Resistance: Maximum 410 mOhm
• Operating Temperature: -40°C to 125°C
• Mounting Type: Surface Mount
• Environmental Compliance: ROHS3 Compliant, MSL 1

The Würth Elektronik 74404063330 qualifies as a substitute because it meets or exceeds all critical electrical parameters while maintaining surface mount compatibility and environmental compliance. Variations in shielding type (semi-shielded versus fully shielded) and physical dimensions are acceptable provided the electrical performance envelope is maintained.

Parameter Comparison

Engineering Selection Recommendations

The Würth Elektronik 74404063330 is a qualified substitute for the obsolete SCR63B-330 based on the following factors:

• Electrical Performance: The substitute meets all minimum electrical requirements with superior current rating (1.22 A vs. 890 mA) and lower DC resistance (185 mOhm vs. 410 mOhm maximum), resulting in reduced power dissipation and improved thermal performance.

• Environmental Compliance: Both parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage conditions.

• Product Availability: The substitute is in active production status with confirmed inventory (6152 pcs), whereas the main part is obsolete. This ensures long-term supply chain reliability.

• Operating Temperature: Identical operating temperature range (-40°C to 125°C) ensures thermal compatibility in the target application.

• Shielding Consideration: The substitute features semi-shielded construction versus the main part's fully shielded design. Applications requiring full electromagnetic shielding must evaluate whether semi-shielded performance is acceptable for the specific circuit environment.

Frequently Asked Questions (FAQ)

Q: Can the Würth Elektronik 74404063330 directly replace the SCR63B-330 in all applications?

A: The substitute meets all specified electrical parameters and environmental compliance requirements. However, the difference in shielding type (semi-shielded vs. fully shielded) requires evaluation based on the specific application's electromagnetic interference (EMI) environment. If full shielding is critical to circuit performance, alternative substitutes with fully shielded construction should be considered.

Q: What are the key electrical advantages of the substitute part?

A: The 74404063330 provides higher current rating (1.22 A vs. 890 mA) and significantly lower DC resistance (185 mOhm vs. 410 mOhm maximum). These characteristics result in lower power dissipation, reduced heat generation, and improved efficiency in the application circuit.

Q: Are there packaging or footprint differences between the main part and substitute?

A: Both parts are surface mount components in nonstandard packaging. The main part dimensions are 0.256" L × 0.232" W × 0.138" H (6.50mm × 5.90mm × 4.60mm). The substitute dimensions are 0.236" L × 0.236" W × 0.110" H (6.00mm × 6.00mm × 2.80mm). Physical layout verification is required to confirm PCB compatibility.

Q: What is the inductance tolerance for both parts?

A: Both the SCR63B-330 and 74404063330 maintain ±20% inductance tolerance, ensuring consistent performance across the specified tolerance band.

Q: Is the substitute part suitable for high-reliability applications?

A: The Würth Elektronik 74404063330 carries AEC-Q200 qualification, indicating automotive-grade reliability standards. The main part does not list this certification. For applications requiring specific reliability certifications, this difference should be evaluated against project requirements.

Q: What is the self-resonant frequency of the substitute part?

A: The 74404063330 has a self-resonant frequency of 16 MHz, compared to no specified value for the main part. This parameter is relevant for high-frequency applications where parasitic resonance effects may impact circuit performance.