CDR156NP-681LC Equivalent & Substitute Parts

Part Overview

The CDR156NP-681LC is a 680 µH unshielded drum core wirewound inductor manufactured by Sumida America Components Inc., rated for 550 mA continuous current with a maximum DC resistance of 1.67Ohm. This surface mount component operates across the temperature range of -40°C to 100°C and is RoHS3 compliant with MSL 1 rating.

The CDR156NP-681LC is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this inductance value and current rating.

Substiute Parts

CDR156NP-681LC

Sumida America Components Inc.In Stock: 967CDR156NP-681LC Datasheet

Current PartRFQ

P0250.684NLT

Pulse ElectronicsIn Stock: 3714P0250.684NLT Datasheet

DirectRFQ

SDR1806-681KL

Bourns Inc.In Stock: 1402SDR1806-681KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDR156NP-681LC are identified based on strict electrical and mechanical compatibility criteria. The following parameters must align for substitution eligibility:

Primary Substitution Criteria:

• Inductance value: 680 µH (exact match required)
• Inductance tolerance: ±15% or tighter
• Current rating: Equal to or greater than 550 mA
• DC resistance: Equal to or lower than 1.67Ohm
• Saturation current: Equal to or greater than 1.1A
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• RoHS3 compliance: Required
• MSL rating: 1 (Unlimited)

Substitute Parts Identified:

1. P0250.684NLT (Pulse Electronics) – Direct substitute with improved current rating and lower DCR
2. SDR1806-681KL (Bourns Inc.) – Similar substitute with enhanced specifications and tighter tolerance

Both substitute parts meet or exceed the electrical requirements of the main part while maintaining surface mount compatibility and environmental compliance standards.

Parameter Comparison

Engineering Selection Recommendations

P0250.684NLT (Pulse Electronics)

This part is recommended as the primary direct substitute. It provides superior electrical performance with a current rating of 720 mA (130% of the main part requirement) and reduced DC resistance of 1.1Ohm (34% lower than the main part). The extended operating temperature range of -40°C to 130°C offers additional thermal margin. The part is currently in active production status with 3609 units in stock, ensuring supply chain continuity. RoHS3 compliance and MSL 1 rating match the original specification. Physical dimensions are within acceptable tolerance for PCB layout compatibility.

SDR1806-681KL (Bourns Inc.)

This part serves as an alternative substitute with comparable electrical performance. It delivers a current rating of 700 mA (127% of the main part requirement) and DC resistance of 1.2Ohm (28% lower than the main part). The inductance tolerance is tighter at ±10% compared to the main part's ±15%, providing improved consistency. Operating temperature range extends to 125°C. The part is in active production with 1327 units available. RoHS3 compliance and MSL 1 rating are maintained. Physical dimensions are slightly more compact, which may provide PCB layout advantages.

Both substitute parts satisfy all mandatory electrical and mechanical compatibility criteria. Selection between them should be based on specific application requirements, PCB layout constraints, and supply chain preferences.

Frequently Asked Questions (FAQ)

Q1: Can P0250.684NLT be used as a direct replacement for CDR156NP-681LC?

A: Yes. P0250.684NLT meets all substitution criteria: identical 680 µH inductance, equal or superior current rating (720 mA vs. 550 mA), lower DC resistance (1.1Ohm vs. 1.67Ohm), matching saturation current specification (1.2A vs. 1.1A), identical shielding configuration, surface mount compatibility, and RoHS3/MSL 1 compliance. Physical dimensions are within acceptable tolerance for standard PCB layouts.

Q2: Can SDR1806-681KL be used as a direct replacement for CDR156NP-681LC?

A: Yes. SDR1806-681KL meets all substitution criteria: identical 680 µH inductance, superior current rating (700 mA vs. 550 mA), lower DC resistance (1.2Ohm vs. 1.67Ohm), matching saturation current specification (1.2A vs. 1.1A), identical shielding configuration, surface mount compatibility, and RoHS3/MSL 1 compliance. The tighter inductance tolerance (±10% vs. ±15%) provides improved performance consistency.

Q3: What are the key electrical differences between the substitute parts?

A: P0250.684NLT offers the lowest DC resistance at 1.1Ohm and highest current rating at 720 mA, with the widest operating temperature range (-40°C to 130°C). SDR1806-681KL provides a tighter inductance tolerance (±10%) and slightly lower profile height (6.90mm vs. 7.36mm), with operating temperature range to 125°C. Both exceed the main part's electrical specifications.

Q4: Are there physical compatibility concerns when substituting these parts?

A: Physical dimensions are similar across all three parts. P0250.684NLT is slightly larger (18.62mm x 15.14mm vs. 18.50mm x 15.00mm) with greater height (7.36mm vs. 7.00mm). SDR1806-681KL is slightly smaller (18.30mm x 14.00mm) with lower height (6.90mm). Verify PCB footprint and clearance specifications for your specific application before implementation.

Q5: Do the substitute parts maintain environmental compliance?

A: Yes. Both P0250.684NLT and SDR1806-681KL are RoHS3 compliant with MSL 1 (Unlimited) rating, matching the original part's environmental specifications. Both are suitable for applications requiring regulatory compliance with RoHS directives.

Q6: What is the supply status of these substitute parts?

A: CDR156NP-681LC is obsolete with 943 units in stock. P0250.684NLT is in active production with 3609 units available. SDR1806-681KL is in active production with 1327 units available. For long-term supply continuity, either active substitute is preferable to the obsolete main part.