Murata Power Solutions 42103C Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 42103C is a 10.2 µH unshielded toroidal inductor rated for 15.4 A continuous current with a maximum DC resistance of 6mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is specified for 100 kHz inductance testing. The 42103C carries an obsolete product status, making identification of functionally equivalent alternatives essential for ongoing design support and procurement planning.

Substiute Parts

42103C

Murata Power Solutions Inc.In Stock: 94342103C Datasheet

Current PartRFQ

HCTR-681

API Delevan Inc.In Stock: 1087HCTR-681 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 42103C is determined by the following criteria:

Primary Substitution Parameters:

• Inductance value within tolerance band overlap (10.2 µH ±15% = 8.67–11.73 µH)
• Current rating sufficient to support 15.4 A operation
• DC resistance comparable to 6mOhm maximum specification
• Surface mount toroidal package configuration
• Operating temperature range encompassing -40°C to 125°C
• Compliance with RoHS and REACH requirements

The API Delevan HCTR-681 meets these substitution criteria with an inductance of 10.5 µH (within the tolerance overlap), current rating of 13.2 A, and DC resistance of 6.2mOhm maximum. Both components are surface mount toroidal inductors with compatible operating temperature ranges and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The API Delevan HCTR-681 is an active product with current manufacturing support, providing supply chain continuity for applications previously designed around the obsolete Murata 42103C. Both components maintain RoHS and REACH compliance, with the HCTR-681 meeting ROHS3 specifications.

When selecting the HCTR-681 as a substitute, verify that the application tolerates the following parameter differences:

• Current rating reduction from 15.4 A to 13.2 A
• Inductance tolerance increase from ±15% to ±25%
• DC resistance increase from 6mOhm to 6.2mOhm maximum
• Shielding configuration change from unshielded to shielded
• Self-resonant frequency reduction from 38 MHz to 30 MHz

The HCTR-681 operates across an extended upper temperature limit (130°C versus 125°C) and maintains compatibility with the -40°C lower bound through a -30°C minimum specification.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan HCTR-681 directly replace the Murata 42103C in all applications?

A: Direct substitution requires verification that the application can operate within the HCTR-681 parameter specifications. The reduced current rating (13.2 A versus 15.4 A) and increased inductance tolerance (±25% versus ±15%) must be evaluated against circuit requirements. The shielded configuration of the HCTR-681 may affect electromagnetic coupling in sensitive layouts.

Q: What is the inductance overlap between these two parts?

A: The Murata 42103C specifies 10.2 µH ±15%, yielding a range of 8.67–11.73 µH. The API Delevan HCTR-681 specifies 10.5 µH ±25%, yielding a range of 7.875–13.125 µH. The overlap region is 8.67–11.73 µH, confirming functional compatibility within tolerance bands.

Q: Does the shielded design of the HCTR-681 affect circuit performance?

A: Shielding reduces electromagnetic radiation and susceptibility to external fields. Applications sensitive to EMI coupling or requiring specific unshielded characteristics must evaluate whether the shielded HCTR-681 introduces unacceptable performance changes.

Q: Are there temperature range considerations for substitution?

A: The Murata 42103C operates from -40°C to 125°C. The API Delevan HCTR-681 operates from -30°C to 130°C. Applications requiring operation below -30°C cannot use the HCTR-681. Applications operating above 125°C benefit from the extended upper limit of the HCTR-681.

Q: What is the DC resistance impact of substitution?

A: The HCTR-681 exhibits a maximum DC resistance of 6.2mOhm compared to the 42103C specification of 6mOhm maximum. This 0.2mOhm increase results in marginally higher resistive losses. For high-current applications near the 13.2 A rating, cumulative power dissipation should be recalculated.