SD25-330-R Equivalent & Substitute Parts

Part Overview

The SD25-330-R is a 33 µH shielded drum core, wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 1.11 A continuous current with a DC resistance of 214.9 mOhm and operates across the temperature range of -40°C to 85°C. The part is RoHS Compliant and carries an Active product status. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative specifications better suit application requirements.

Substiute Parts

SD25-330-R

Eaton - Electronics DivisionIn Stock: 735SD25-330-R Datasheet

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CDPH4D19FNP-330MC

Sumida America Components Inc.In Stock: 3160CDPH4D19FNP-330MC Datasheet

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SRN5040-330M

Bourns Inc.In Stock: 6298SRN5040-330M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SD25-330-R are qualified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 33 µH with ±20% tolerance
• Inductance test frequency: 100 kHz
• Core material: Ferrite
• Mounting type: Surface Mount
• Operating temperature range compatibility
• RoHS compliance status
• Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

• Current rating: Minimum 1.11 A (substitute parts rated 1.2 A or higher are acceptable)
• DC resistance: Within reasonable tolerance of 214.9 mOhm (200-216 mOhm range acceptable)
• Saturation current: Minimum 711 mA
• Shielding type: Shielded or Semi-Shielded configurations
• Package dimensions: Nonstandard surface mount packages with compatible footprints

The two substitute parts listed meet these criteria while offering variations in current rating, temperature range, and shielding configuration.

Parameter Comparison

Engineering Selection Recommendations

CDPH4D19FNP-330MC (Sumida America Components Inc.)

This substitute part is fully qualified for applications requiring the SD25-330-R specification. The CDPH4D19FNP-330MC provides a higher current rating of 1.25 A compared to the primary part's 1.11 A, with DC resistance of 200 mOhm Max, which is lower than the original 214.9 mOhm. The extended operating temperature range of -40°C to 105°C exceeds the primary part's -40°C to 85°C range. This part maintains full shielding and carries ROHS3 Compliant status. Physical dimensions are slightly smaller at 4.90mm x 4.90mm with a lower profile height of 2.00mm. Selection of this part is appropriate when higher current capacity and extended temperature operation are beneficial to the application.

SRN5040-330M (Bourns Inc.)

This substitute part meets the core electrical requirements of the SD25-330-R with a 1.2 A current rating and 216 mOhm Max DC resistance. The SRN5040-330M offers the widest operating temperature range at -40°C to 125°C and the highest saturation current at 1.3 A. This part features semi-shielded construction rather than full shielding and includes measured Q factor of 17 at 2.52 MHz and self-resonant frequency of 8 MHz. The physical footprint is 5.00mm x 5.00mm with a maximum height of 4.00mm. ROHS3 Compliant status and REACH Unaffected designation are provided. Selection of this part is appropriate for applications requiring extended temperature operation and higher saturation current performance, with the understanding that semi-shielded construction may have different EMI characteristics compared to fully shielded designs.

Frequently Asked Questions (FAQ)

Q: Can the CDPH4D19FNP-330MC be used as a direct replacement for the SD25-330-R?

A: The CDPH4D19FNP-330MC is electrically compatible with the SD25-330-R based on matching inductance value, tolerance, core material, and test frequency. Both parts are fully shielded, surface mount ferrite inductors with identical inductance specifications. Physical dimensions differ slightly (4.90mm vs 5.20mm), requiring verification of PCB layout compatibility. The substitute part offers higher current rating and extended temperature range, making it suitable for equivalent or more demanding applications.

Q: What are the key differences between the two substitute parts?

A: The CDPH4D19FNP-330MC (Sumida) provides full shielding with a lower profile (2.00mm height) and higher current rating (1.25 A). The SRN5040-330M (Bourns) features semi-shielded construction with a taller profile (4.00mm height), higher saturation current (1.3 A), and the widest temperature range (-40°C to 125°C). The Sumida part is more compact, while the Bourns part offers superior thermal performance and saturation characteristics.

Q: Are there any compliance or regulatory differences between these parts?

A: All three parts carry RoHS compliance status (RoHS Compliant for the primary part, ROHS3 Compliant for both substitutes). All parts share identical ECCN (EAR99) and HTSUS (8504.50.4000) classifications. The SRN5040-330M includes REACH Unaffected designation, while the CDPH4D19FNP-330MC lists REACH Status as Vendor Undefined. All parts maintain MSL 1 (Unlimited) moisture sensitivity level.

Q: How do the DC resistance values compare, and does this matter for my application?

A: The SD25-330-R has 214.9 mOhm DCR, the CDPH4D19FNP-330MC has 200 mOhm Max, and the SRN5040-330M has 216 mOhm Max. These values are within a narrow range (200-216 mOhm) and represent typical variation across manufacturers. Lower DCR reduces power dissipation and heat generation. Selection between these parts based on DCR alone is not critical unless the application has specific thermal or efficiency constraints.

Q: What is the significance of saturation current differences?

A: The SD25-330-R has Isat of 711 mA, the CDPH4D19FNP-330MC has 430 mA, and the SRN5040-330M has 1.3 A. Saturation current indicates the current level at which the inductor begins to lose inductance due to core saturation. The Sumida part has the lowest saturation current, requiring careful verification if peak currents approach 430 mA. The Bourns part offers the highest saturation margin, providing greater headroom for transient current conditions.

Q: Do the physical dimension differences affect PCB layout?

A: Yes. The primary part is 5.20mm x 5.20mm with 2.50mm height. The Sumida substitute is 4.90mm x 4.90mm with 2.00mm height (more compact). The Bourns substitute is 5.00mm x 5.00mm with 4.00mm height (taller). PCB footprint compatibility must be verified before substitution. The Sumida part offers space savings in both lateral and vertical dimensions, while the Bourns part requires additional vertical clearance.

Q: Which substitute part should I select for a high-temperature application?

A: The SRN5040-330M (Bourns) supports operation to 125°C, compared to the primary part's 85°C and the Sumida part's 105°C. If your application requires sustained operation above 105°C, the Bourns part is the appropriate selection. Verify that other circuit components also support the extended temperature range.

Q: Are there any shielding considerations when switching between these parts?

A: The SD25-330-R and CDPH4D19FNP-330MC are both fully shielded, providing equivalent EMI containment. The SRN5040-330M is semi-shielded, which may result in different electromagnetic field distribution. In noise-sensitive applications or where EMI performance is critical, the fully shielded parts (Eaton or Sumida) are preferred. Semi-shielded construction may be acceptable in less sensitive applications and offers cost or performance advantages in specific designs.