CDRR157NP-221MC Equivalent & Substitute Parts

Part Overview

The CDRR157NP-221MC is a 220 µH shielded surface mount inductor manufactured by Sumida America Components Inc. This fixed inductor is designed for applications requiring moderate current handling (900 mA rated) with controlled DC resistance (485mOhm maximum). The component operates across the industrial temperature range of -40°C to 100°C and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this product category.

Substiute Parts

CDRR157NP-221MC

Sumida America Components Inc.In Stock: 822CDRR157NP-221MC Datasheet

Current PartRFQ

SRR1806-221M

Bourns Inc.In Stock: 1728SRR1806-221M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDRR157NP-221MC is determined by the following critical parameters:

Inductance Value: 220 µH ±20% tolerance establishes the primary electrical specification. Substitute parts must maintain this inductance value within the specified tolerance band.

Current Rating: The rated current of 900 mA defines the continuous current handling capability. Substitute parts must support at least this current level without exceeding thermal or saturation limits during normal operation.

DC Resistance: The 485mOhm maximum DCR specification controls power dissipation and thermal performance. Substitute parts must not exceed this resistance value to maintain equivalent electrical characteristics.

Saturation Current: The 1.3A saturation current establishes the maximum current before inductance degradation occurs. Substitute parts must maintain saturation performance at or above this threshold.

Core Material and Shielding: Ferrite core construction with shielding is required to maintain electromagnetic compatibility and performance consistency.

Mounting and Package: Surface mount configuration with nonstandard package dimensions (18.50mm L x 15.00mm W x 7.00mm H maximum) defines the physical form factor.

Compliance: RoHS3 compliance is mandatory for regulatory equivalence.

Parameter Comparison

Engineering Selection Recommendations

The SRR1806-221M from Bourns Inc. qualifies as a direct substitute for the CDRR157NP-221MC based on electrical and mechanical parameter alignment.

Electrical Equivalence: Both inductors maintain the 220 µH inductance value at ±20% tolerance and operate at 100 kHz test frequency. The SRR1806-221M provides higher current rating (1 A versus 900 mA) and higher saturation current (1.9 A versus 1.3 A), establishing superior performance margins in continuous and transient current conditions. The DC resistance variance of 25mOhm (510mOhm versus 485mOhm maximum) represents a 5% increase, which remains within acceptable engineering tolerance for inductor substitution in most applications.

Mechanical Compatibility: Physical dimensions are compatible within standard PCB assembly tolerances. The SRR1806-221M measures 18.30mm L x 14.00mm W x 7.10mm H (seated maximum), compared to 18.50mm L x 15.00mm W x 7.00mm H for the CDRR157NP-221MC. These dimensional differences do not preclude direct board-level substitution.

Compliance and Reliability: Both components are RoHS3 compliant and carry MSL Level 1 (unlimited moisture sensitivity). The SRR1806-221M extends the operating temperature range to -40°C to 125°C, providing additional thermal margin beyond the CDRR157NP-221MC specification of -40°C to 100°C.

Product Status: Both components maintain Active product status, ensuring continued availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the SRR1806-221M replace the CDRR157NP-221MC in existing designs?

A: Yes. The SRR1806-221M meets or exceeds all critical electrical parameters (inductance, current rating, saturation current) and maintains mechanical compatibility within standard PCB assembly tolerances. Both components are RoHS3 compliant with identical moisture sensitivity ratings.

Q: What is the significance of the DC resistance difference (485mOhm versus 510mOhm)?

A: The 25mOhm difference represents approximately 5% variance. In applications where power dissipation is critical, this variance should be evaluated against thermal budget requirements. The substitute part generates slightly higher resistive losses but remains within acceptable engineering tolerance for most inductor applications.

Q: Are there dimensional concerns with the SRR1806-221M substitution?

A: No. The SRR1806-221M dimensions (18.30mm L x 14.00mm W x 7.10mm H) are mechanically compatible with the CDRR157NP-221MC footprint (18.50mm L x 15.00mm W x 7.00mm H). The 0.2mm height difference and reduced length/width are within standard PCB assembly tolerances and do not require board redesign.

Q: Does the higher saturation current of the SRR1806-221M affect circuit performance?

A: No. Higher saturation current (1.9 A versus 1.3 A) provides additional performance margin and does not degrade circuit operation. This characteristic is beneficial for transient current conditions and improves component reliability under peak load conditions.

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

A: The CDRR157NP-221MC operates from -40°C to 100°C, while the SRR1806-221M operates from -40°C to 125°C. The substitute part supports a wider temperature range, making it suitable for applications requiring extended thermal performance. Applications limited to -40°C to 100°C operation are fully compatible with both components.

Q: What is the packaging format for both inductors?

A: Both components are supplied in Tape & Reel (TR) packaging for automated assembly. Both use nonstandard package configurations optimized for surface mount assembly.