CD43NP-270MC Equivalent & Substitute Parts

Part Overview

The CD43NP-270MC is a 27 µH unshielded surface mount inductor manufactured by Sumida America Components Inc. This fixed inductor is designed for applications requiring 620 mA current handling capability with a maximum DC resistance of 522 mOhm. The component operates across the temperature range of -40°C to 100°C and is RoHS3 compliant. Active product status indicates continued manufacturer support and availability. Substitute parts are identified to provide design flexibility when the primary part is unavailable or when alternative electrical characteristics better suit specific application requirements.

Substiute Parts

CD43NP-270MC

Sumida America Components Inc.In Stock: 1163CD43NP-270MC Datasheet

Current PartRFQ

SDR0403-270KL

Bourns Inc.In Stock: 6410SDR0403-270KL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD43NP-270MC is determined by strict equivalence in the following critical parameters:

Mandatory Equivalence Criteria:

• Inductance value: 27 µH (tolerance variations acceptable within design margin)
• Mounting type: Surface Mount
• Package dimensions: 4.50mm L x 4.00mm W x 3.50mm H (nonstandard case)
• Shielding configuration: Unshielded
• Core material: Ferrite

Allowable Parameter Variations:

• Current rating: Substitute must equal or exceed 620 mA
• DC resistance: Substitute must not exceed 522 mOhm maximum
• Operating temperature: Substitute range must encompass or exceed -40°C to 100°C
• Inductance tolerance: Substitute tolerance of ±10% is tighter than the ±20% specification and remains acceptable
• RoHS and MSL compliance: Substitute must maintain ROHS3 compliance and MSL 1 rating

The SDR0403-270KL meets all mandatory equivalence criteria and demonstrates improved electrical characteristics in current rating (710 mA vs. 620 mA) and DC resistance (520 mOhm vs. 522 mOhm maximum), with extended operating temperature range (-40°C to 125°C vs. -40°C to 100°C).

Parameter Comparison

Engineering Selection Recommendations

CD43NP-270MC Selection: Select the CD43NP-270MC when Sumida America Components Inc. supply chain continuity is required or when design documentation specifies this manufacturer. The component maintains active product status with 1106 pieces in current inventory. RoHS3 compliance and MSL 1 rating satisfy environmental and moisture handling requirements for standard surface mount assembly processes.

SDR0403-270KL Selection: Select the SDR0403-270KL (Bourns Inc.) when enhanced electrical performance is beneficial or when Sumida supply is constrained. The substitute provides superior current handling (710 mA vs. 620 mA), equivalent DC resistance performance (520 mOhm vs. 522 mOhm maximum), and extended operating temperature range (-40°C to 125°C vs. -40°C to 100°C). Both components maintain identical package footprint (4.50mm x 4.00mm x 3.50mm), enabling direct PCB layout compatibility. RoHS3 compliance and MSL 1 rating are maintained. Inventory availability for SDR0403-270KL is 6300 pieces.

Both parts are suitable for applications requiring 27 µH inductance in nonstandard surface mount packages with ferrite core construction and unshielded configuration.

Frequently Asked Questions (FAQ)

Q: Can SDR0403-270KL replace CD43NP-270MC in existing designs without PCB modification?

A: Yes. Both inductors share identical package dimensions (4.50mm L x 4.00mm W x 3.50mm H) and surface mount configuration. Direct footprint compatibility is confirmed. No PCB layout changes are required.

Q: What is the significance of the ±10% tolerance on SDR0403-270KL versus ±20% on CD43NP-270MC?

A: The SDR0403-270KL tolerance of ±10% represents tighter inductance accuracy. This substitute will maintain inductance values closer to the 27 µH nominal specification across manufacturing variation. Applications sensitive to inductance tolerance will benefit from this characteristic.

Q: Does the higher current rating of SDR0403-270KL (710 mA vs. 620 mA) affect circuit behavior?

A: No. The higher current rating indicates the substitute can safely handle greater current without saturation. In applications where the circuit operates at or below 620 mA, both inductors perform identically. The substitute provides additional design margin.

Q: Are both inductors suitable for the same operating temperature range?

A: The CD43NP-270MC operates from -40°C to 100°C. The SDR0403-270KL operates from -40°C to 125°C. Applications requiring operation above 100°C must use SDR0403-270KL. For applications within -40°C to 100°C, both are suitable.

Q: What is the difference between the inductance test frequencies listed for these parts?

A: CD43NP-270MC inductance is tested at 2.52 MHz. SDR0403-270KL inductance is tested at 1 kHz. Both measurements confirm the 27 µH inductance value. The different test frequencies reflect manufacturer measurement standards and do not affect substitution compatibility.

Q: Do both inductors meet RoHS and moisture sensitivity requirements?

A: Yes. Both CD43NP-270MC and SDR0403-270KL are ROHS3 compliant and rated MSL 1 (Unlimited moisture sensitivity level). Both are suitable for standard surface mount assembly processes without special moisture handling precautions.

Q: What does "Unshielded" mean for these inductors?

A: Unshielded inductors do not have a magnetic shield enclosure. Both the CD43NP-270MC and SDR0403-270KL are unshielded ferrite core inductors. They will exhibit magnetic field radiation typical of unshielded designs. Applications requiring magnetic field containment must specify shielded alternatives.

Q: Can these 27 µH inductors be used interchangeably in RF and power supply applications?

A: Both inductors are suitable for general-purpose applications requiring 27 µH inductance. The ferrite core construction and unshielded configuration are appropriate for power supply filtering and general RF applications within the specified current and temperature ratings. Application-specific performance validation is the responsibility of the circuit designer.