MF-RX110-AP-99 Equivalent & Substitute Parts

Part Overview

The Bourns MF-RX110-AP-99 is a polymeric PTC resettable fuse rated for 60V maximum voltage with 1.1A hold current. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. The MF-RX series provides overcurrent protection through automatic thermal reset functionality in radial disc configuration.

Substiute Parts

MF-RX110-AP-99

Bourns Inc.In Stock: 890MF-RX110-AP-99 Datasheet

Current PartRFQ

MF-RX110/72-AP

Bourns Inc.In Stock: 966MF-RX110/72-AP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-RX110-AP-99 is determined by the following critical parameters:

• Voltage Rating: The substitute must support the system voltage requirement. The MF-RX110/72-AP operates at 72V maximum, which is compatible with 60V applications as it provides higher voltage margin.
• Current Characteristics: Hold current (Ih), trip current (It), and maximum current must match or exceed the original specification to maintain equivalent protection behavior.
• Thermal Response: Time to trip and resistance characteristics must remain consistent to preserve circuit protection timing.
• Physical Form Factor: Mounting type, package configuration, and lead spacing must be identical for direct board-level replacement.
• Compliance & Certification: RoHS3 compliance and approval agencies (cURus, TUV) ensure regulatory equivalence.

The MF-RX110/72-AP qualifies as a parametric equivalent substitute, maintaining identical electrical performance characteristics while offering enhanced voltage rating and active product status.

Parameter Comparison

Engineering Selection Recommendations

The MF-RX110/72-AP is the direct substitute for the obsolete MF-RX110-AP-99. Both components maintain identical electrical performance across all critical protection parameters: hold current, trip current, thermal response time, and resistance characteristics. The substitute offers enhanced voltage rating (72V vs. 60V), providing additional design margin for systems operating at or below 60V.

Both parts carry ROHS3 compliance and cURus/TUV certifications, ensuring regulatory equivalence. The MF-RX110/72-AP maintains active product status, ensuring long-term availability and supply chain continuity. Physical compatibility is confirmed through identical mounting type, package configuration, and lead spacing, enabling direct board-level substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Can the MF-RX110/72-AP replace the MF-RX110-AP-99 in existing designs?

A: Yes. The substitute maintains identical electrical characteristics for hold current, trip current, time to trip, and resistance values. Physical form factor and lead spacing are identical, enabling direct replacement without PCB modification.

Q: What is the significance of the higher voltage rating on the substitute?

A: The MF-RX110/72-AP operates at 72V maximum compared to 60V on the original part. This higher rating provides additional voltage margin and is fully compatible with 60V system applications. No circuit redesign is required.

Q: Are there compliance differences between the two parts?

A: No. Both components are ROHS3 compliant and carry identical approval certifications (cURus, TUV). Regulatory requirements are met by either part.

Q: Why is the original part obsolete?

A: The MF-RX110-AP-99 is classified as obsolete by the manufacturer. The MF-RX110/72-AP represents the active equivalent in the Multifuse MF-RX series, ensuring continued availability for new production and design updates.

Q: Are there packaging differences?

A: The original part is supplied in standard packaging, while the substitute is available in Tape & Box (TB) configuration. Both maintain identical component specifications and physical dimensions for board-level compatibility.