SCH74-560 Equivalent & Substitute Parts

Part Overview

The SCH74-560 is a 56 µH unshielded wirewound surface mount inductor manufactured by Signal Transformer, rated for 1.43 A continuous current with a maximum DC resistance of 260mOhm. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance standards.

Substiute Parts

SCH74-560

Signal TransformerIn Stock: 1158SCH74-560 Datasheet

Current PartRFQ

CDH74NP-560KC

Sumida America Components Inc.In Stock: 747CDH74NP-560KC Datasheet

MFR RecommendedRFQ

SPD74R-563M

API Delevan Inc.In Stock: 2390SPD74R-563M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SCH74-560 are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 56 µH (exact match required)
• Inductance tolerance: ±10% or tighter
• Current rating: minimum 1.1 A (acceptable for applications requiring ≤1.43 A)
• DC resistance: 260mOhm to 350mOhm maximum
• Mounting type: Surface Mount (identical)
• Physical footprint: 8.00mm x 7.30mm or 7.30mm x 7.30mm (compatible with standard PCB layouts)
• Operating temperature range: minimum -40°C to 100°C

Allowed Parameter Variations:

• Core material: Ferrite drum core acceptable as alternative to wirewound
• Shielding: Both shielded and unshielded configurations qualify
• Saturation current: Values between 1.1 A and 1.15 A acceptable
• Tolerance: Up to ±20% acceptable for non-critical applications

Parameter Comparison

Engineering Selection Recommendations

CDH74NP-560KC (Sumida America Components Inc.) is the primary substitute for the SCH74-560. This part maintains identical inductance (56 µH), tolerance (±10%), DC resistance (260mOhm Max), and physical footprint (8.00mm x 7.30mm x 5.20mm). The current rating of 1.15 A is suitable for applications operating at or below this threshold. Both parts are ROHS3 compliant with MSL rating 1. The CDH74NP-560KC is currently in active production status with 708 units in stock, ensuring supply continuity. The operating temperature range extends to 100°C, which covers most industrial applications within the SCH74-560's -40°C to 125°C specification.

SPD74R-563M (API Delevan Inc.) serves as an alternative substitute when shielded configuration is required or when extended temperature operation to -55°C is necessary. This part maintains the 56 µH inductance value and is actively produced with 2300 units available. The shielded design reduces electromagnetic interference in sensitive circuit environments. The current rating of 1.1 A and increased DC resistance of 350mOhm Max represent acceptable trade-offs for applications not requiring the full 1.43 A rating of the original part. The inductance tolerance of ±20% is wider than the SCH74-560's ±10%, requiring verification in tolerance-critical applications. Physical dimensions are slightly smaller (7.30mm x 7.30mm x 4.70mm), which may require PCB layout adjustment.

Both substitute parts are ROHS3 compliant, carry MSL rating 1, and are available in Tape & Reel packaging for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the CDH74NP-560KC directly replace the SCH74-560 in all applications?

A: The CDH74NP-560KC is suitable for applications where the current requirement does not exceed 1.15 A. The inductance value, tolerance, DC resistance, and physical footprint are identical. The operating temperature range of -40°C to 100°C covers most industrial applications; however, designs requiring operation above 100°C should use the SPD74R-563M instead.

Q: What is the impact of the SPD74R-563M's ±20% inductance tolerance compared to the SCH74-560's ±10%?

A: The wider tolerance of ±20% means the actual inductance value may deviate further from the nominal 56 µH specification. In circuits where inductance tolerance is critical to performance (such as precision filters or resonant circuits), this wider tolerance may require circuit redesign or component selection. For general-purpose applications with tolerance margins, this difference is acceptable.

Q: Is the shielded SPD74R-563M compatible with unshielded circuit designs?

A: Yes. The shielded configuration of the SPD74R-563M is mechanically and electrically compatible with PCB layouts designed for unshielded inductors. The shielding provides additional electromagnetic interference rejection, which is beneficial in most applications. No circuit modifications are required.

Q: How do the physical dimension differences affect PCB layout?

A: The CDH74NP-560KC maintains identical dimensions (8.00mm x 7.30mm x 5.20mm) to the SCH74-560, requiring no PCB layout changes. The SPD74R-563M is slightly smaller (7.30mm x 7.30mm x 4.70mm), which may require minor PCB footprint adjustment. Verify that the smaller footprint is compatible with your PCB design before implementation.

Q: Are both substitute parts suitable for automated assembly?

A: Yes. Both the CDH74NP-560KC and SPD74R-563M are supplied in Tape & Reel (TR) packaging, which is standard for automated pick-and-place assembly processes. The SCH74-560's nonstandard packaging may have required manual handling, whereas the substitute parts integrate seamlessly into modern manufacturing workflows.

Q: What is the current rating limitation when using substitute parts?

A: The CDH74NP-560KC is rated for 1.15 A and the SPD74R-563M for 1.1 A, compared to the SCH74-560's 1.43 A rating. Applications requiring continuous current above 1.15 A should not use these substitutes. For applications operating at or below 1.1 A, both substitutes are acceptable.