SCH53-270 Equivalent & Substitute Parts

Part Overview

The SCH53-270 is a 27 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 900 mA continuous current with a maximum DC resistance of 420mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is mounted as a surface mount device in a nonstandard package measuring 6.00mm × 5.40mm × 3.20mm (max height).

Substiute Parts

SCH53-270

Signal TransformerIn Stock: 863SCH53-270 Datasheet

Current PartRFQ

CDH53NP-270KC

Sumida America Components Inc.In Stock: 917CDH53NP-270KC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The CDH53NP-270KC from Sumida America Components Inc. qualifies as a direct substitute based on the following alignment of critical electrical and mechanical parameters:

Matched Parameters:

• Inductance: 27 µH (identical)
• DC Resistance: 420 mOhm Max (identical)
• Shielding: Unshielded (identical)
• Mounting Type: Surface Mount (identical)
• Package dimensions: 6.00mm L × 5.20mm W × 3.20mm H (compatible within nonstandard envelope)
• Inductance test frequency: 1 kHz (identical)
• RoHS3 compliance (identical)
• MSL rating: 1 (Unlimited) (identical)

Acceptable Parameter Variations:

• Current Rating: 720 mA (substitute) vs. 900 mA (original) — the substitute operates at a lower continuous current rating, suitable for applications not requiring the full 900 mA capacity
• Inductance Tolerance: ±10% (substitute) vs. ±20% (original) — the substitute provides tighter tolerance control
• Operating Temperature: -40°C to 100°C (substitute) vs. -40°C to 125°C (original) — the substitute supports the lower temperature bound but with a reduced upper limit of 100°C
• Core Material: Ferrite drum core (substitute) vs. unspecified (original) — both are unshielded wirewound constructions suitable for the same application class

Parameter Comparison

Engineering Selection Recommendations

The CDH53NP-270KC is suitable as a substitute for the obsolete SCH53-270 in applications where the following conditions are met:

• Circuit design does not require continuous current operation above 720 mA
• Operating environment does not exceed 100°C ambient temperature
• The tighter inductance tolerance of ±10% is compatible with circuit performance requirements
• PCB layout accommodates the 0.20mm reduction in width (5.20mm vs. 5.40mm)

The substitute part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating, providing long-term procurement stability. Both parts maintain identical DC resistance characteristics and unshielded construction, ensuring equivalent electromagnetic behavior in the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the CDH53NP-270KC directly replace the SCH53-270 in all applications?

A: The CDH53NP-270KC is functionally equivalent for applications operating at or below 720 mA continuous current and 100°C maximum ambient temperature. Applications requiring the full 900 mA rating or operation above 100°C require circuit redesign or alternative component selection.

Q: What is the impact of the ±10% tolerance on the substitute part compared to ±20% on the original?

A: The substitute part provides tighter inductance tolerance control. This results in more predictable circuit behavior and reduced performance variation across production batches. No negative impact occurs; this represents an improvement in component consistency.

Q: Are the physical dimensions compatible for PCB layout?

A: Both parts share identical length (6.00mm) and height (3.20mm). The substitute is 0.20mm narrower (5.20mm vs. 5.40mm), which is compatible with standard PCB footprints designed for the original part. No layout modification is required.

Q: What is the difference between wirewound and drum core wirewound construction?

A: Both are wirewound inductors with identical electrical performance at the specified parameters. The drum core construction in the substitute provides a defined ferrite core geometry, while the original part uses unspecified core material. Both maintain unshielded operation and equivalent DC resistance.

Q: Does the lower maximum operating temperature of the substitute affect suitability?

A: The substitute operates from -40°C to 100°C, compared to the original's -40°C to 125°C range. Selection depends on the application's actual thermal environment. If the circuit operates below 100°C, no limitation exists. Applications requiring sustained operation above 100°C require alternative components.

Q: Are both parts RoHS3 compliant?

A: Yes, both the SCH53-270 and CDH53NP-270KC are ROHS3 compliant with MSL rating of 1 (Unlimited), ensuring compatibility with modern manufacturing and environmental regulations.