CDR156NP-330LC Equivalent & Substitute Parts

Part Overview

The CDR156NP-330LC is a 33 µH unshielded drum core wirewound inductor manufactured by Sumida America Components Inc., rated for 3 A continuous current with a maximum DC resistance of 68 mOhm. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity. The part operates across the temperature range of -40°C to 100°C and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substiute Parts

CDR156NP-330LC

Sumida America Components Inc.In Stock: 1097CDR156NP-330LC Datasheet

Current PartRFQ

P0250.333NLT

Pulse ElectronicsIn Stock: 7693P0250.333NLT Datasheet

DirectRFQ

SDR1806-330ML

Bourns Inc.In Stock: 1832SDR1806-330ML Datasheet

SimilarRFQ

SDR2207-330YL

Bourns Inc.In Stock: 1452SDR2207-330YL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDR156NP-330LC is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 33 µH (exact match required)
• Current rating: minimum 3 A continuous
• Shielding configuration: unshielded
• Mounting type: surface mount
• Inductance test frequency: 100 kHz

Secondary Compatibility Factors:

• DC resistance: maximum 68 mOhm (lower values acceptable)
• Saturation current: minimum 5.2 A
• Inductance tolerance: ±15% or tighter
• Operating temperature range: must encompass -40°C to 100°C minimum
• RoHS3 compliance and MSL 1 rating

The three substitute parts identified meet these criteria with variations in DC resistance, saturation current, and physical dimensions that remain within acceptable engineering tolerances for this inductor category.

Parameter Comparison

Engineering Selection Recommendations

P0250.333NLT (Pulse Electronics) is suitable for direct substitution where the extended operating temperature range to 130°C provides additional thermal margin. The 66 mOhm DC resistance is 2 mOhm lower than the original specification, resulting in reduced power dissipation. This part is currently in active production status with 7658 units in stock inventory.

SDR1806-330ML (Bourns) provides electrical equivalence with identical 68 mOhm DC resistance and ferrite drum core construction matching the original design. The inductance tolerance widens to ±20%, and the operating temperature extends to 125°C. Active production status with 1738 units available. Physical dimensions are slightly smaller (0.720" L x 0.551" W vs. 0.728" L x 0.591" W).

SDR2207-330YL (Bourns) offers enhanced current handling at 3.4 A continuous rating with the lowest DC resistance at 58.4 mOhm among all substitutes. Ferrite drum core construction and ±15% tolerance match the original specification. Operating temperature range extends to 125°C. Active production status with 1358 units in stock. Physical dimensions are larger (0.866" L x 0.591" W), requiring PCB layout verification.

All three substitutes maintain RoHS3 compliance, MSL 1 rating, and surface mount configuration. Selection should be based on thermal requirements, available PCB space, and DC resistance impact on circuit performance.

Frequently Asked Questions (FAQ)

Q: Can P0250.333NLT replace CDR156NP-330LC in all applications?

A: P0250.333NLT meets all primary electrical specifications: 33 µH inductance, 3 A current rating, unshielded configuration, and surface mount packaging. The 66 mOhm DC resistance is 2 mOhm lower, reducing power dissipation. The extended temperature range to 130°C provides additional operational margin. Substitution is valid for applications operating within -40°C to 100°C.

Q: What is the difference between the Bourns SDR1806-330ML and SDR2207-330YL options?

A: Both are ferrite drum core inductors with 33 µH inductance and unshielded configuration. SDR1806-330ML maintains the original 68 mOhm DC resistance with 3 A rating. SDR2207-330YL provides enhanced performance with 3.4 A current rating and reduced 58.4 mOhm DC resistance, but requires larger PCB footprint (0.866" L vs. 0.720" L). Inductance tolerance is ±20% for SDR1806-330ML and ±15% for SDR2207-330YL.

Q: Are there physical dimension constraints when substituting these parts?

A: Yes. The original CDR156NP-330LC measures 0.728" L x 0.591" W x 0.276" H. P0250.333NLT (0.733" L x 0.596" W x 0.290" H) and SDR1806-330ML (0.720" L x 0.551" W x 0.272" H) fit within similar footprints. SDR2207-330YL is significantly larger at 0.866" L x 0.591" W x 0.307" H and requires PCB layout verification before implementation.

Q: Do all substitutes maintain the same RoHS and moisture sensitivity compliance?

A: Yes. All three substitute parts are RoHS3 compliant with MSL 1 (unlimited moisture sensitivity), matching the original CDR156NP-330LC specification.

Q: Which substitute offers the best thermal performance?

A: P0250.333NLT extends the operating temperature range to 130°C, providing the widest thermal margin. SDR1806-330ML and SDR2207-330YL both operate to 125°C. For applications requiring operation above 100°C, P0250.333NLT or either Bourns option is suitable.

Q: How does DC resistance variation affect circuit performance?

A: Lower DC resistance reduces I²R power dissipation. P0250.333NLT at 66 mOhm and SDR2207-330YL at 58.4 mOhm dissipate less heat than the original 68 mOhm specification at equivalent current levels. This improves thermal stability but may require circuit re-evaluation if the original design relied on specific resistance characteristics.