SCH53-4R7 Equivalent & Substitute Parts

Part Overview

The SCH53-4R7 is a 4.7 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 2 A continuous current with a maximum DC resistance of 96 mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant.

Substiute Parts

SCH53-4R7

Signal TransformerIn Stock: 847SCH53-4R7 Datasheet

Current PartRFQ

7447785004

Würth ElektronikIn Stock: 88467447785004 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCH53-4R7 is determined by the following critical parameters:

• Inductance Value: Must be 4.7 µH with tolerance compatibility
• Current Rating: Substitute must support minimum 2 A continuous current
• Saturation Current: Substitute saturation current must meet or exceed application requirements
• DC Resistance: Lower DCR values are acceptable; higher values may impact circuit performance
• Mounting Type: Surface mount compatibility required
• Package Dimensions: Physical footprint must accommodate PCB layout constraints
• Operating Temperature Range: Must support -40°C to 125°C minimum
• Compliance: ROHS3 compliance required for regulatory alignment

The Würth Elektronik 7447785004 qualifies as a substitute based on matching inductance value, exceeding current rating specifications, and maintaining temperature and compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

The 7447785004 substitute from Würth Elektronik is suitable for applications requiring the SCH53-4R7 based on the following factors:

• Active Product Status: The substitute is actively manufactured and supported, ensuring long-term availability and supply chain stability compared to the obsolete main part.
• Electrical Performance: The substitute exceeds the current rating (2.65 A vs. 2 A) and saturation current (2.5 A vs. 1.68 A), providing design margin for the application.
• Improved DC Resistance: The lower DCR value (78 mOhm vs. 96 mOhm) reduces power dissipation and thermal effects in the circuit.
• Compliance Alignment: Both parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental requirements are met.
• Physical Compatibility: Package dimensions are within acceptable tolerance for standard PCB layouts, with minimal height increase (3.30 mm vs. 3.20 mm).
• Certification: The substitute carries AEC-Q200 qualification, indicating automotive-grade reliability standards.

Frequently Asked Questions (FAQ)

Q: Can the 7447785004 be used as a direct replacement for the SCH53-4R7?

A: Yes, the 7447785004 meets the electrical and mechanical requirements for substitution. The inductance value is identical at 4.7 µH, current ratings are exceeded, and operating temperature ranges match. Physical dimensions are within acceptable tolerance for standard PCB layouts.

Q: What is the difference between shielded and unshielded inductors in this substitution?

A: The main part is unshielded, while the substitute is shielded. Shielding reduces electromagnetic interference (EMI) emissions and susceptibility, which may improve circuit performance in noise-sensitive applications. This is a beneficial characteristic for the substitute.

Q: Does the higher inductance tolerance of the substitute (±25% vs. ±20%) affect circuit performance?

A: The substitute tolerance is wider by 5 percentage points. For applications with tight inductance requirements, this difference should be evaluated against circuit specifications. Both tolerances fall within standard industrial ranges for wirewound inductors.

Q: Are there any PCB layout considerations when switching to the 7447785004?

A: The substitute dimensions are slightly larger (6.20 mm × 5.90 mm vs. 6.00 mm × 5.40 mm). Verify that the PCB footprint accommodates the larger package. The height difference is minimal (3.30 mm vs. 3.20 mm) and typically does not impact clearance constraints.

Q: What is the significance of the AEC-Q200 rating on the substitute?

A: AEC-Q200 is an automotive electronics qualification standard. This certification indicates the substitute has undergone rigorous reliability testing and is suitable for automotive and high-reliability applications, providing additional assurance beyond standard industrial requirements.