SD25-6R8-R Equivalent & Substitute Parts

Part Overview

The SD25-6R8-R is a 6.8 µH shielded drum core, wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 2.19 A continuous current with a DC resistance of 55.6 mOhm and operates across the temperature range of -40°C to 85°C. The part is RoHS Compliant and carries an Active product status, indicating current availability and ongoing manufacturer support. Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, inventory management, or supply chain continuity.

Substiute Parts

SD25-6R8-R

Eaton - Electronics DivisionIn Stock: 2295SD25-6R8-R Datasheet

Current PartRFQ

CDPH4D19FNP-6R8MC

Sumida America Components Inc.In Stock: 2195CDPH4D19FNP-6R8MC Datasheet

SimilarRFQ

SRN5040-6R8M

Bourns Inc.In Stock: 5356SRN5040-6R8M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SD25-6R8-R are selected based on the following critical parameters:

Primary Matching Criteria:

• Inductance value: 6.8 µH at 100 kHz test frequency
• Inductance tolerance: ±20%
• Core material: Ferrite
• Mounting type: Surface Mount
• Package type: Tape & Reel (TR)
• RoHS compliance status

Secondary Compatibility Factors:

• Current rating capability (minimum 2.19 A required)
• DC resistance within acceptable operational limits
• Operating temperature range compatibility
• Shielding characteristics (shielded or semi-shielded acceptable for EMI-sensitive applications)
• Moisture sensitivity level (MSL 1 - Unlimited)

The identified substitutes maintain the same inductance specification and core material while accommodating variations in current saturation ratings, DC resistance, and thermal operating ranges. All substitute parts are Active status components with current manufacturer support.

Parameter Comparison

Engineering Selection Recommendations

SD25-6R8-R (Eaton - Electronics Division)

Primary selection for applications requiring the specified operating temperature range of -40°C to 85°C. RoHS Compliant status meets standard environmental requirements. Shielded configuration provides EMI containment. Current inventory of 2227 pieces supports immediate availability.

CDPH4D19FNP-6R8MC (Sumida America Components Inc.)

Suitable for applications requiring higher current capacity (3.02 A rating) within a compact footprint (4.90mm x 4.90mm). ROHS3 Compliant status exceeds baseline RoHS requirements. Extended operating temperature range to 105°C accommodates elevated thermal environments. Lower DC resistance (50 mOhm Max) reduces power dissipation. Shielded configuration maintains EMI performance. Current inventory of 2128 pieces supports supply continuity.

SRN5040-6R8M (Bourns Inc.)

Applicable for applications requiring the highest operating temperature capability (125°C maximum). ROHS3 Compliant status meets advanced environmental standards. Semi-shielded configuration provides partial EMI containment suitable for less restrictive electromagnetic environments. Higher saturation current (2.6 A) supports transient current conditions. Specified Q factor (15 @ 7.96MHz) and self-resonant frequency (21MHz) enable frequency-dependent circuit analysis. Current inventory of 5300 pieces provides extended supply availability.

All three parts maintain Active product status with current manufacturer support and carry identical ECCN and HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can the CDPH4D19FNP-6R8MC substitute for the SD25-6R8-R in all applications?

A: The CDPH4D19FNP-6R8MC maintains the same 6.8 µH inductance, ±20% tolerance, ferrite core material, and shielded configuration. The higher current rating (3.02 A vs. 2.19 A) and lower DC resistance (50 mOhm Max vs. 55.6 mOhm) provide improved performance margins. The extended operating temperature range to 105°C accommodates higher thermal environments. Physical dimensions differ slightly (4.90mm vs. 5.20mm), requiring PCB layout verification. Substitution is valid for applications operating within the 105°C maximum temperature specification.

Q: What are the physical footprint differences between these parts?

A: The SD25-6R8-R measures 5.20mm x 5.20mm with a maximum seated height of 2.50mm. The CDPH4D19FNP-6R8MC measures 4.90mm x 4.90mm with a maximum seated height of 2.00mm, offering a more compact profile. The SRN5040-6R8M measures 5.00mm x 5.00mm with a maximum seated height of 4.00mm, requiring additional vertical clearance. PCB layout and component placement constraints determine which footprint is acceptable for a given application.

Q: How do shielding differences affect circuit performance?

A: The SD25-6R8-R and CDPH4D19FNP-6R8MC are fully shielded, containing electromagnetic fields within the component package. The SRN5040-6R8M is semi-shielded, allowing partial field radiation. Shielded configurations are required in EMI-sensitive applications or when adjacent components are susceptible to magnetic coupling. Semi-shielded configurations are acceptable in applications with lower EMI constraints or when component spacing permits field containment through layout design.

Q: Are all three parts compatible with automated assembly processes?

A: All three parts are supplied in Tape & Reel (TR) packaging and are Surface Mount components, supporting standard automated pick-and-place assembly equipment. Tape specifications and reel dimensions follow industry standards. Component height variations (2.00mm to 4.00mm) may affect feeder compatibility on specific assembly equipment; verification with equipment specifications is required.

Q: What is the significance of the saturation current (Isat) specification?

A: Saturation current indicates the DC current level at which the inductor's inductance begins to degrade due to core saturation. The SD25-6R8-R has Isat of 1.56 A, the CDPH4D19FNP-6R8MC has Isat of 1 A, and the SRN5040-6R8M has Isat of 2.6 A. Applications with transient or peak currents approaching saturation levels require parts with higher Isat ratings to maintain inductance stability. The SRN5040-6R8M provides the highest saturation margin for current-limited applications.

Q: Do all parts meet the same environmental compliance standards?

A: The SD25-6R8-R is RoHS Compliant. The CDPH4D19FNP-6R8MC and SRN5040-6R8M are ROHS3 Compliant, representing an enhanced compliance level. All three parts carry MSL 1 (Unlimited) moisture sensitivity ratings, eliminating moisture-related handling constraints. All parts are classified as EAR99 for export control purposes and share the same HTSUS tariff classification (8504.50.4000).

Q: How does DC resistance affect circuit operation?

A: DC resistance represents resistive losses in the inductor winding. The SD25-6R8-R has 55.6 mOhm, the CDPH4D19FNP-6R8MC has 50 mOhm Max, and the SRN5040-6R8M has 59 mOhm Max. Lower DC resistance reduces power dissipation and heat generation, improving efficiency in current-carrying applications. Applications with stringent thermal or efficiency requirements benefit from the CDPH4D19FNP-6R8MC's lower resistance specification.

Q: What operating temperature range should be selected for my application?

A: The SD25-6R8-R operates from -40°C to 85°C, suitable for standard industrial and consumer applications. The CDPH4D19FNP-6R8MC extends to 105°C, accommodating elevated ambient or component-generated heat. The SRN5040-6R8M reaches 125°C, supporting high-temperature environments such as automotive underhood or industrial process control applications. Selection depends on the maximum sustained temperature the inductor will experience in the final application environment.