Murata Power Solutions 42422C Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 42422C is a 4.23 µH unshielded toroidal inductor rated for 11.4 A continuous current with a maximum DC resistance of 5.2 mOhm. This component is designed for surface mount applications in the nonstandard package format. The part is currently obsolete, making identification of suitable substitute components essential for ongoing production support and design continuity.

Substiute Parts

42422C

Murata Power SolutionsIn Stock: 91242422C Datasheet

Current PartRFQ

HCTR-442

API Delevan Inc.In Stock: 1218HCTR-442 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 42422C is determined by the following critical parameters:

Inductance Value: The substitute must provide 4.23 µH ±15% or equivalent inductance within acceptable circuit tolerance. The API Delevan HCTR-442 provides 4.2 µH, which falls within the acceptable inductance range for this application.

Current Rating: The substitute must support the circuit's current requirements. The 42422C is rated for 11.4 A; the HCTR-442 is rated for 12.8 A, providing adequate current capacity.

DC Resistance: The substitute's DCR must not exceed the maximum allowable resistance for the circuit. The 42422C specifies 5.2 mOhm max; the HCTR-442 specifies 5.4 mOhm max, representing a marginal increase acceptable for most applications.

Mounting and Package Compatibility: Both components are surface mount toroidal inductors in nonstandard packages with comparable physical dimensions (17.00 mm × 17.00 mm vs. 16.89 mm × 16.89 mm), ensuring PCB layout compatibility.

Operating Temperature Range: The substitute must support the circuit's thermal environment. The 42422C operates from -40°C to 125°C; the HCTR-442 operates from -30°C to 130°C, providing adequate coverage for most applications.

Parameter Comparison

Engineering Selection Recommendations

The API Delevan HCTR-442 is a suitable substitute for the obsolete Murata 42422C based on the following factors:

Electrical Compatibility: The HCTR-442 meets the core electrical requirements with inductance within acceptable tolerance, higher current capacity, and comparable DC resistance. The 0.2 mOhm increase in DCR represents a 3.8% rise and is acceptable for most circuit applications.

Regulatory Compliance: Both components maintain RoHS compliance. The HCTR-442 carries ROHS3 certification, meeting current regulatory standards. Both components are REACH unaffected and classified as EAR99 for export control purposes.

Physical Compatibility: The HCTR-442 footprint is compatible with the 42422C PCB layout. The dimensional differences (0.11 mm in length/width and 0.26 mm in height) are within typical PCB assembly tolerances for nonstandard toroidal packages.

Availability: The HCTR-442 is actively manufactured with confirmed inventory availability, ensuring long-term supply continuity compared to the obsolete 42422C.

Shielding Consideration: The HCTR-442 provides shielded construction versus the unshielded 42422C. In applications where EMI performance is critical, this represents an improvement. In applications where shielding is not required, the shielded design does not introduce incompatibility.

Frequently Asked Questions (FAQ)

Q: Can the HCTR-442 directly replace the 42422C without circuit modification?

A: The HCTR-442 is electrically and mechanically compatible with the 42422C for most applications. The inductance values (4.23 µH vs. 4.2 µH) are within acceptable tolerance bands. The higher current rating and comparable DC resistance support direct substitution. Verify that the circuit's operating temperature range does not require the -40°C minimum of the 42422C, as the HCTR-442 operates from -30°C minimum.

Q: What is the impact of the 0.2 mOhm increase in DC resistance?

A: The HCTR-442 DCR of 5.4 mOhm represents a 3.8% increase over the 42422C specification of 5.2 mOhm. This results in marginally higher resistive losses. For most power delivery and filtering applications, this difference is negligible. Calculate circuit-specific impact if the application operates at maximum current (11.4 A) continuously.

Q: Does the shielded design of the HCTR-442 affect compatibility?

A: The shielded construction of the HCTR-442 does not create incompatibility with the unshielded 42422C design. Shielding reduces EMI emissions and susceptibility. If the original circuit was designed without shielding considerations, the HCTR-442 shielding provides additional performance margin without negative effects.

Q: Are the physical dimensions compatible with the existing PCB layout?

A: Yes. The HCTR-442 dimensions (16.89 mm × 16.89 mm × 10.16 mm) are compatible with the 42422C footprint (17.00 mm × 17.00 mm × 9.90 mm). The differences of 0.11 mm in lateral dimensions and 0.26 mm in height are within standard PCB assembly tolerances for nonstandard toroidal packages.

Q: What is the difference in self-resonant frequency between the two parts?

A: The 42422C has a self-resonant frequency of 90 MHz, while the HCTR-442 is specified at 85 MHz. This 5 MHz difference may be relevant in high-frequency applications above 50 MHz. For standard power delivery and filtering applications below 10 MHz, this difference is not significant.

Q: Are there any compliance or certification differences?

A: Both components are RoHS compliant. The HCTR-442 carries ROHS3 certification, representing current regulatory standards. Both are REACH unaffected and EAR99 classified. The HCTR-442 meets or exceeds the compliance profile of the obsolete 42422C.