CMF-RQ50-10-0 Equivalent & Substitute Parts

Part Overview

The CMF-RQ50-10-0 is a ceramic PTC resettable fuse manufactured by Bourns Inc., rated for 230V (600V internal) with a 90 mA hold current. This component is designed for overcurrent protection in through-hole applications using an 8-DIP package format. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

CMF-RQ50-10-0

Bourns Inc.In Stock: 1202CMF-RQ50-10-0 Datasheet

Current PartRFQ

B59970C0080A070

EPCOS - TDK ElectronicsIn Stock: 1611B59970C0080A070 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMF-RQ50-10-0 is constrained by the following critical parameters:

Current rating (90 mA hold current) and trip current (190 mA) must remain consistent to maintain circuit protection integrity. The ceramic PTC resettable fuse type is mandatory for functional equivalence. Through-hole mounting is required for PCB compatibility. RoHS3 compliance and REACH unaffected status must be maintained for regulatory alignment.

The B59970C0080A070 shares the identical hold current (90 mA), trip current (190 mA), and maximum current (3 A) specifications. Both components are ceramic PTC resettable fuses with through-hole mounting and equivalent regulatory compliance. However, voltage rating and package form factor differ, requiring application-level assessment.

Parameter Comparison

Engineering Selection Recommendations

The B59970C0080A070 is functionally equivalent for overcurrent protection based on matching hold current, trip current, and maximum current specifications. Both components maintain ROHS3 compliance and REACH unaffected status.

Selection of the B59970C0080A070 requires verification that the 80V maximum voltage rating is appropriate for the application circuit. The CMF-RQ50-10-0 operates at 230V, representing a significant voltage derating. The B59970C0080A070 features lower resistance (9.4 Ohms vs. 50 Ohms), which affects power dissipation characteristics and must be evaluated against thermal design constraints.

Package form factor differs: the CMF-RQ50-10-0 uses 8-DIP configuration while the B59970C0080A070 uses radial disc format. PCB layout and mechanical mounting compatibility must be confirmed before implementation.

The B59970C0080A070 carries active product status with defined operating temperature range (-40°C ~ 85°C) and third-party approvals (UR, VDE), providing superior long-term availability and regulatory documentation compared to the obsolete CMF-RQ50-10-0.

Frequently Asked Questions (FAQ)

Q: Can the B59970C0080A070 directly replace the CMF-RQ50-10-0 in all applications?

A: Direct replacement requires application-level assessment. The B59970C0080A070 has a maximum voltage rating of 80V compared to the CMF-RQ50-10-0's 230V rating. If the circuit operates above 80V, this substitute is not suitable. Package form factor also differs (radial disc vs. 8-DIP), requiring PCB layout verification.

Q: What is the significance of the different resistance values (50 Ohms vs. 9.4 Ohms)?

A: Resistance affects power dissipation during normal operation and thermal behavior during fault conditions. The lower resistance of the B59970C0080A070 results in reduced power loss but may alter thermal characteristics. Circuit thermal analysis is necessary to confirm compatibility.

Q: Are both components RoHS compliant?

A: Yes, both the CMF-RQ50-10-0 and B59970C0080A070 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is the CMF-RQ50-10-0 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The B59970C0080A070 maintains active product status with ongoing availability and manufacturer support.

Q: Does the B59970C0080A070 have third-party certifications?

A: Yes, the B59970C0080A070 carries UR and VDE approvals, providing documented compliance with recognized safety standards. The CMF-RQ50-10-0 approval agency information is not specified in available documentation.