Equivalent & Substitute Parts for Murata 42842C

Part Overview

The Murata 42842C is an 8.45 µH unshielded toroidal surface mount inductor rated for 10.4 A continuous current with 8mOhm maximum DC resistance. Designed for high-frequency applications up to 50 MHz self-resonant frequency, this component operates across the industrial temperature range of -40°C to 125°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

42842C

Murata Power Solutions Inc.In Stock: 98642842C Datasheet

Current PartRFQ

HCTR-502

API Delevan Inc.In Stock: 799HCTR-502 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Murata 42842C is determined by the following critical parameters:

• Inductance Value: 8.45 µH nominal (tolerance range 7.18 µH to 9.72 µH at ±15%)
• Current Rating: Minimum 10.4 A continuous
• DC Resistance: Maximum 8 mOhm
• Mounting Configuration: Surface mount toroidal package
• Physical Footprint: 18.80mm x 18.80mm base dimensions
• Frequency Performance: Self-resonant frequency ≥45 MHz minimum

The API Delevan HCTR-502 qualifies as a manufacturer-recommended substitute. While it introduces shielding (a design enhancement rather than incompatibility), it maintains inductance within acceptable tolerance, exceeds current rating specifications, and preserves the physical mounting interface and frequency characteristics required for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

The API Delevan HCTR-502 is the designated manufacturer-recommended substitute for the obsolete Murata 42842C. Selection is based on the following engineering criteria:

Product Status: The Murata 42842C is classified as obsolete, making the active-status HCTR-502 the appropriate long-term solution for new designs and ongoing production support.

Electrical Compatibility: The HCTR-502 meets or exceeds all critical electrical parameters. The 8.4 µH inductance value falls within the acceptable tolerance window, current rating increases from 10.4 A to 10.8 A, and DC resistance remains within specification at 8.3 mOhm maximum.

Regulatory Compliance: Both components maintain RoHS compliance and REACH unaffected status. The HCTR-502 carries ROHS3 certification, representing current regulatory alignment.

Physical Integration: The identical 18.80mm x 18.80mm footprint ensures direct PCB layout compatibility. The height variance of 0.26mm (9.90mm to 10.16mm) is negligible for standard assembly processes and does not impact clearance or thermal management in typical applications.

Shielding Enhancement: The transition from unshielded to shielded construction in the HCTR-502 provides improved electromagnetic interference rejection without introducing incompatibility. This represents a design enhancement suitable for noise-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the API Delevan HCTR-502 be used as a direct replacement for the Murata 42842C without circuit modification?

A: Yes. The HCTR-502 maintains electrical performance within acceptable parameters and shares the identical PCB footprint. No circuit redesign is required for substitution.

Q: What is the inductance tolerance impact when substituting the HCTR-502 for the 42842C?

A: The HCTR-502 carries ±25% tolerance versus the original ±15%. At nominal 8.4 µH, the HCTR-502 tolerance range is 6.3 µH to 10.5 µH. The 42842C tolerance range at 8.45 µH is 7.18 µH to 9.72 µH. Both components overlap significantly in the 7.18 µH to 9.72 µH window, ensuring functional compatibility for most applications. Circuit designs with tight inductance requirements should verify performance with the wider tolerance specification.

Q: Does the shielded construction of the HCTR-502 affect thermal performance compared to the unshielded 42842C?

A: Shielding introduces minimal thermal impact in toroidal inductor designs. The HCTR-502 operating temperature range (-30°C to 130°C) is comparable to the 42842C (-40°C to 125°C), indicating equivalent thermal management. Applications requiring the full -40°C lower limit should verify HCTR-502 performance at that temperature boundary.

Q: Are there any height clearance concerns with the 0.26mm increase from 9.90mm to 10.16mm?

A: The height variance is negligible for standard PCB assembly. Clearance issues only arise in space-constrained designs with <0.26mm vertical tolerance. Verify clearance in applications with height-critical component stacking or enclosure constraints.

Q: What is the Q factor difference between the two components?

A: The HCTR-502 specifies Q of 23 at 100 kHz. The 42842C does not provide Q specification in the available data. For applications where Q factor is critical, the HCTR-502 value of 23 at 100 kHz should be validated against circuit requirements.

Q: Are moisture sensitivity and handling requirements identical?

A: Yes. Both components carry MSL 1 (Unlimited) classification, requiring identical moisture control and storage procedures. No change in handling protocols is necessary during substitution.