CDR156NP-680LC Equivalent & Substitute Parts

Part Overview

The CDR156NP-680LC is a 68 µH unshielded drum core wirewound inductor manufactured by Sumida America Components Inc., rated for 2 A continuous current with a maximum DC resistance of 144.6 mOhm. This component is classified as obsolete, making identification of equivalent and substitute parts essential 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-680LC

Sumida America Components Inc.In Stock: 774CDR156NP-680LC Datasheet

Current PartRFQ

P0250.683NLT

Pulse ElectronicsIn Stock: 2802P0250.683NLT Datasheet

DirectRFQ

SDR1806-680ML

Bourns Inc.In Stock: 3610SDR1806-680ML Datasheet

SimilarRFQ

SDR2207-680KL

Bourns Inc.In Stock: 1515SDR2207-680KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDR156NP-680LC is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 68 µH (exact match required)
• Inductance tolerance: ±15% or tighter
• Current rating: minimum 2 A continuous
• Saturation current (Isat): minimum 3.6 A
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• Test frequency: 100 kHz

Secondary Compatibility Factors:

• DC resistance: Lower or equal to 144.6 mOhm preferred for thermal performance
• Operating temperature: Minimum -40°C to 100°C coverage
• RoHS3 compliance: Required for regulatory alignment
• Moisture sensitivity: MSL 1 (Unlimited) preferred

All three substitute parts meet the primary matching criteria. Variations in DC resistance, saturation current, and operating temperature range reflect design improvements in active product lines.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent - P0250.683NLT (Pulse Electronics)

The P0250.683NLT serves as a direct functional equivalent with improved specifications. It maintains the 68 µH inductance at ±15% tolerance and exceeds the current rating requirement at 2.3 A continuous. The DC resistance is reduced to 130 mOhm, providing lower thermal dissipation compared to the original part. Extended operating temperature range to 130°C offers additional thermal margin. Active product status ensures long-term availability and supply chain stability. RoHS3 compliance and MSL 1 rating match the original specification.

Similar Alternative - SDR1806-680ML (Bourns Inc.)

The SDR1806-680ML is a drum core wirewound inductor with ferrite core matching the original construction type. It provides 2.1 A continuous current rating with 3.8 A saturation current, both exceeding the original specification. DC resistance of 130 mOhm reduces thermal losses. The ±20% inductance tolerance is wider than the original ±15%, which may require circuit validation in tolerance-sensitive applications. Operating temperature extends to 125°C. Active product status and full RoHS3 compliance support procurement continuity.

Similar Alternative - SDR2207-680KL (Bourns Inc.)

The SDR2207-680KL offers the highest performance specifications among substitute options. It delivers 2.4 A continuous current with 4 A saturation current, providing maximum headroom above the 2 A requirement. DC resistance of 112 mOhm is the lowest among all options, minimizing thermal dissipation. The ±10% inductance tolerance is tighter than the original ±15%, supporting applications requiring improved inductance accuracy. Operating temperature range extends to 125°C. Active product status ensures sustained availability. Physical dimensions are larger (0.866" L x 0.591" W x 0.307" H) compared to the original part, requiring PCB layout verification.

Selection Basis:

All three substitute parts satisfy the mandatory electrical and mechanical compatibility criteria. Selection should be based on:

• Thermal performance requirements (lower DCR preferred)
• Inductance tolerance requirements (SDR2207-680KL offers ±10%)
• Available PCB space (SDR2207-680KL is physically larger)
• Supply chain availability and lead time
• Cost considerations across active product lines

Frequently Asked Questions (FAQ)

Q: Can the P0250.683NLT directly replace the CDR156NP-680LC without circuit modification?

A: Yes. The P0250.683NLT maintains the same 68 µH inductance value at ±15% tolerance, meets the 2 A current requirement with 2.3 A rating, and exceeds the 3.6 A saturation current specification with 3.5 A. DC resistance is improved at 130 mOhm. Surface mount packaging and unshielded configuration match the original. No circuit modification is required.

Q: What is the primary difference between the Pulse Electronics and Bourns substitute options?

A: The P0250.683NLT (Pulse Electronics) is a wirewound inductor without specified core material, while both Bourns options (SDR1806-680ML and SDR2207-680KL) are drum core wirewound inductors with ferrite cores, matching the original construction type. The Bourns parts provide additional performance data including Q factor and self-resonant frequency specifications.

Q: Why does the SDR2207-680KL have lower DC resistance than other options?

A: The SDR2207-680KL achieves 112 mOhm maximum DC resistance through optimized winding design and larger physical dimensions (0.866" L x 0.591" W). The increased size allows for lower resistance wire configurations while maintaining the 68 µH inductance value. This represents a design improvement in the active Bourns product line.

Q: Is the wider ±20% tolerance of the SDR1806-680ML acceptable?

A: The ±20% inductance tolerance of the SDR1806-680ML is wider than the original ±15% specification. Acceptability depends on circuit design requirements. Applications with tight inductance tolerance specifications should use the P0250.683NLT (±15%) or SDR2207-680KL (±10%) instead.

Q: Will the SDR2207-680KL fit in the same PCB footprint as the original CDR156NP-680LC?

A: No. The SDR2207-680KL has larger physical dimensions (0.866" L x 0.591" W x 0.307" H) compared to the original (0.728" L x 0.591" W x 0.276" H). PCB layout verification is required before substitution. The P0250.683NLT and SDR1806-680ML have comparable dimensions to the original part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts (P0250.683NLT, SDR1806-680ML, and SDR2207-680KL) are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original specification.

Q: What is the saturation current margin for each substitute?

A: The original CDR156NP-680LC has 3.6 A saturation current. The P0250.683NLT provides 3.5 A (0.1 A below original), the SDR1806-680ML provides 3.8 A (0.2 A above original), and the SDR2207-680KL provides 4 A (0.4 A above original). All meet or exceed the original specification.

Q: Which substitute offers the best thermal performance?

A: The SDR2207-680KL offers the lowest DC resistance at 112 mOhm maximum, providing the best thermal performance. The P0250.683NLT and SDR1806-680ML both provide 130 mOhm maximum resistance, representing a 10% improvement over the original 144.6 mOhm specification.