CD1-3R8-R Equivalent & Substitute Parts Reference

Part Overview

The CD1-3R8-R is a 3.8 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 6.55 A continuous current with a maximum DC resistance of 13 mOhm and operates across the temperature range of -40°C to 85°C. The part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

CD1-3R8-R

Eaton - Electronics DivisionIn Stock: 1168CD1-3R8-R Datasheet

Current PartRFQ

DR1040-3R8-R

Eaton - Electronics DivisionIn Stock: 2701DR1040-3R8-R Datasheet

DirectRFQ

CDRH104RNP-3R8NC

Sumida America Components Inc.In Stock: 6223CDRH104RNP-3R8NC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CD1-3R8-R are identified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Matching Parameters:

• Inductance value: 3.8 µH with ±30% tolerance
• DC Resistance: 13 mOhm maximum
• Shielding: Shielded configuration required
• Mounting: Surface mount technology
• Test frequency: 100 kHz

Acceptable Variation Parameters:

• Current rating: Substitute parts may have lower continuous current ratings (5.5 A vs. 6.55 A) provided saturation current (Isat) remains adequate
• Operating temperature range: Substitutes may have extended upper temperature limits
• Physical dimensions: Minor variations within nonstandard package constraints are acceptable if mounting compatibility is maintained
• Product status: Active status substitutes are preferred over obsolete parts

The identified substitutes meet these criteria and provide functional equivalence for the CD1-3R8-R in applications where the specified electrical parameters are required.

Parameter Comparison

Engineering Selection Recommendations

DR1040-3R8-R (Direct Substitute - Eaton):

The DR1040-3R8-R is the primary direct substitute for the CD1-3R8-R. Both components are manufactured by Eaton - Electronics Division and share identical inductance (3.8 µH), tolerance (±30%), and DC resistance (13 mOhm max) specifications. The DR1040-3R8-R is in active production status, ensuring long-term availability and supply chain stability. The extended operating temperature range (-40°C to 125°C) provides additional thermal margin compared to the original part. The saturation current (6.4 A) exceeds the original specification, supporting reliable operation. RoHS3 compliance of the DR1040-3R8-R aligns with current regulatory requirements. The continuous current rating of 5.5 A is lower than the original 6.55 A; applications requiring the full original current capacity must be evaluated against actual circuit requirements.

CDRH104RNP-3R8NC (Similar Substitute - Sumida):

The CDRH104RNP-3R8NC from Sumida America Components Inc. provides an alternative source for equivalent inductance and electrical performance. This part maintains the critical specifications: 3.8 µH inductance, ±30% tolerance, 13 mOhm max DC resistance, and shielded configuration. Active product status ensures availability. RoHS3 compliance is confirmed. Physical dimensions are slightly smaller (10.20mm L x 10.00mm W) compared to the original part, which may require PCB layout verification for existing designs. The operating temperature range (-40°C to 100°C) is intermediate between the original and the Eaton substitute. The 5.5 A continuous current rating applies the same consideration as the DR1040-3R8-R.

Selection Criteria:

For designs currently using the CD1-3R8-R, the DR1040-3R8-R is the recommended primary substitute due to manufacturer continuity and identical electrical specifications. The CDRH104RNP-3R8NC serves as a secondary alternative when supply constraints or design flexibility permit component source diversification. Both substitutes are suitable for applications where the 5.5 A continuous current rating is adequate for circuit operation.

Frequently Asked Questions (FAQ)

Q: Can the DR1040-3R8-R directly replace the CD1-3R8-R without circuit modification?

A: The DR1040-3R8-R meets all critical electrical specifications of the CD1-3R8-R: inductance (3.8 µH), tolerance (±30%), DC resistance (13 mOhm max), and shielding. Physical dimensions are nearly identical (10.50mm L x 10.30mm W vs. 10.50mm L x 10.40mm W), supporting direct PCB footprint compatibility. The lower continuous current rating (5.5 A vs. 6.55 A) requires verification that circuit current demands do not exceed 5.5 A. No circuit modification is necessary if this current constraint is satisfied.

Q: What is the impact of the reduced current rating in substitute parts?

A: The DR1040-3R8-R and CDRH104RNP-3R8NC are rated for 5.5 A continuous current, compared to 6.55 A for the original CD1-3R8-R. This represents an 16% reduction in continuous current capacity. Applications operating at currents below 5.5 A experience no performance impact. Designs requiring sustained currents between 5.5 A and 6.55 A must be re-evaluated for thermal and reliability margins. Saturation current specifications (6.4 A for DR1040-3R8-R and 6 A for CDRH104RNP-3R8NC) define transient current limits and remain adequate for both substitutes.

Q: Are there packaging differences between the main part and substitutes?

A: The CD1-3R8-R is supplied in bulk packaging, while both DR1040-3R8-R and CDRH104RNP-3R8NC are supplied in Tape & Reel (TR) format. This difference affects procurement and assembly processes but does not impact component electrical or mechanical performance. TR packaging is standard for high-volume surface mount assembly operations.

Q: How do the physical dimensions of the CDRH104RNP-3R8NC compare to the original part?

A: The CDRH104RNP-3R8NC measures 10.20mm L x 10.00mm W, compared to 10.50mm L x 10.40mm W for the CD1-3R8-R. The height remains constant at 4.00 mm. These dimensional differences are within typical nonstandard package tolerances. PCB layout verification is required to confirm that the slightly smaller footprint does not create clearance conflicts with adjacent components or trace routing.

Q: What is the significance of the extended operating temperature range in the DR1040-3R8-R?

A: The DR1040-3R8-R operates from -40°C to 125°C, compared to -40°C to 85°C for the CD1-3R8-R. This 40°C extension of the upper temperature limit provides additional thermal margin for applications subject to elevated ambient conditions or self-heating effects. For applications operating within the original -40°C to 85°C range, the extended specification offers no functional advantage but does not introduce compatibility issues.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the DR1040-3R8-R and CDRH104RNP-3R8NC are ROHS3 compliant, meeting current regulatory requirements for restricted substances. The original CD1-3R8-R does not specify RoHS status. Substitution with RoHS3 compliant parts ensures compliance with environmental and procurement standards.

Q: Can the CDRH104RNP-3R8NC be used in applications where the DR1040-3R8-R is not available?

A: Yes. The CDRH104RNP-3R8NC meets the same critical electrical specifications (3.8 µH, ±30% tolerance, 13 mOhm max DCR, shielded) and provides functional equivalence. The component is from a different manufacturer (Sumida vs. Eaton), which may require qualification in applications with strict supplier approval requirements. Physical dimensions are slightly smaller, necessitating PCB layout verification. Both parts share the same 5.5 A continuous current limitation.