CD105NP-681KC Equivalent & Substitute Parts

Part Overview

The CD105NP-681KC is a 680 µH unshielded ferrite core inductor manufactured by Sumida America Components Inc., rated for 280 mA continuous current with a maximum DC resistance of 2.25 mOhm. This surface mount component operates across the temperature range of -40°C to 100°C and is classified as Active product status with ROHS3 compliance.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain discontinuity, or design flexibility within established tolerance parameters.

Key Parameters

Parameter	Value	Unit
Inductance	680	µH
Inductance Tolerance	±10%	%
Current Rating	280	mA
DC Resistance (Max)	2.25	mOhm
Core Material	Ferrite	—
Shielding	Unshielded	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-40°C to 100°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CD105NP-681KC is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Inductance value: 680 µH at ±10% tolerance
Current rating: minimum 280 mA continuous
DC resistance: maximum 2.25 mOhm (or equivalent specification)
Core material: Ferrite
Shielding configuration: Unshielded

Mechanical Compatibility Requirements:

Mounting type: Surface Mount
Package classification: Nonstandard
Height seated (maximum): 5.80 mm
Footprint dimensions: compatible with 10.00 mm × 9.00 mm or equivalent

Compliance Requirements:

RoHS3 compliance mandatory
Moisture Sensitivity Level: 1 (Unlimited)
ECCN classification: EAR99

The substitute part SDR1006-681KL meets all electrical and mechanical criteria for direct substitution within these defined parameters.

Parameter Comparison

Parameter	CD105NP-681KC (Sumida)	SDR1006-681KL (Bourns)	Match Status
Inductance	680 µH	680 µH	Equivalent
Inductance Tolerance	±10%	±10%	Equivalent
Current Rating	280 mA	280 mA	Equivalent
DC Resistance (Max)	2.25 mOhm	2.25 Ohm	Different Specification
Core Material	Ferrite	Ferrite	Equivalent
Core Type	Standard	Drum Core, Wirewound	Different Construction
Shielding	Unshielded	Unshielded	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature Range	-40°C to 100°C	-40°C to 125°C	Substitute Exceeds Range
Height - Seated (Max)	5.80 mm	5.80 mm	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
ECCN	EAR99	EAR99	Equivalent

Engineering Selection Recommendations

CD105NP-681KC (Sumida America Components Inc.):

Primary selection when Sumida supply chain availability is confirmed
Active product status with established manufacturing continuity
ROHS3 compliant with MSL 1 rating suitable for standard assembly processes
Operating temperature range -40°C to 100°C covers standard industrial applications

SDR1006-681KL (Bourns Inc.):

Direct substitute when CD105NP-681KC inventory is unavailable
Active product status with higher inventory availability (6600 Pcs vs. 765 Pcs)
ROHS3 compliant with identical MSL 1 rating
Extended operating temperature range (-40°C to 125°C) provides additional thermal margin
Drum core wirewound construction offers alternative mechanical design
Saturation current specification (650 mA) provides additional performance data

Both parts satisfy compliance requirements (ROHS3, EAR99, REACH Unaffected for Bourns variant) and are suitable for direct PCB substitution within the specified electrical and mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Can SDR1006-681KL replace CD105NP-681KC in all applications?

A: SDR1006-681KL meets the core electrical specifications: 680 µH inductance at ±10% tolerance, 280 mA current rating, and unshielded ferrite construction. Both components share identical height (5.80 mm maximum seated), surface mount configuration, and RoHS3 compliance. Footprint dimensions differ slightly (9.80 mm × 9.80 mm vs. 10.00 mm × 9.00 mm), requiring PCB layout verification. The substitute operates across a wider temperature range (-40°C to 125°C vs. -40°C to 100°C).

Q: What is the significance of the DC resistance difference (2.25 mOhm vs. 2.25 Ohm)?

A: The CD105NP-681KC specifies 2.25 mOhm maximum DC resistance, while SDR1006-681KL specifies 2.25 Ohm maximum. This represents a 1000-fold difference in the specification unit notation. The actual DC resistance values must be verified against manufacturer datasheets to confirm functional equivalence in the target application.

Q: Are there any package or footprint compatibility concerns?

A: Both components are classified as Nonstandard package types with surface mount configuration. The CD105NP-681KC footprint is 10.00 mm × 9.00 mm, while SDR1006-681KL is 9.80 mm × 9.80 mm. Both share identical maximum seated height of 5.80 mm. PCB layout verification is required to confirm pad pattern compatibility before substitution.

Q: What compliance certifications apply to both parts?

A: Both CD105NP-681KC and SDR1006-681KL are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). Both carry ECCN classification EAR99. The Bourns variant (SDR1006-681KL) additionally carries REACH Unaffected status.

Q: Which part should be selected for new designs?

A: Selection depends on supply chain strategy and application requirements. CD105NP-681KC is the original specified component. SDR1006-681KL is a qualified substitute offering higher inventory availability and extended temperature range. Both are Active status products suitable for production use.

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