MF-RX250-AP Equivalent & Substitute Parts

Part Overview

The Bourns MF-RX250-AP is a polymeric PTC resettable fuse rated for 60V at 2.5A hold current, designed for through-hole radial mounting in disc configuration. This component is classified as obsolete, making identification of suitable substitutes necessary for ongoing design support and component procurement. The MF-RX series provides automatic overcurrent protection with self-resetting capability across industrial and consumer applications.

Substiute Parts

MF-RX250-AP

Bourns Inc.In Stock: 747MF-RX250-AP Datasheet

Current PartRFQ

MF-RX250/72-0

Bourns Inc.In Stock: 4130MF-RX250/72-0 Datasheet

DirectRFQ

MF-RX250/72-AP

Bourns Inc.In Stock: 858MF-RX250/72-AP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MF-RX250-AP is determined by the following critical parameters:

• Voltage Rating: Maximum voltage must equal or exceed the original 60V specification
• Current Hold (Ih): Must match 2.5A to maintain circuit protection intent
• Current Trip (It): Must match 5A for consistent overcurrent response
• Mounting Configuration: Through-hole radial disc mounting required
• Physical Dimensions: Lead spacing and form factor must be compatible with existing PCB layouts
• Resistance Characteristics: Initial and post-trip resistance values must remain within specified ranges
• Operating Temperature Range: Must support -40°C to 85°C environment

The substitute parts identified below maintain these critical parameters while offering improved product status or alternative packaging options.

Parameter Comparison

Engineering Selection Recommendations

Both MF-RX250/72-0 and MF-RX250/72-AP are suitable substitutes for the obsolete MF-RX250-AP based on electrical and mechanical compatibility. The substitute parts maintain identical hold current, trip current, time-to-trip, and resistance characteristics while offering higher voltage rating (72V versus 60V). This increased voltage margin provides enhanced protection margin in applications operating below 60V.

Both substitute parts carry Active product status, ensuring long-term availability and supply chain stability. All three parts maintain identical cURus and TUV certifications, ROHS3 compliance, and REACH unaffected status. Physical form factor and mounting configuration are identical across all three parts.

Selection between MF-RX250/72-0 and MF-RX250/72-AP depends on packaging requirements: MF-RX250/72-0 is supplied in Bulk packaging, while MF-RX250/72-AP is supplied in Tape & Box configuration suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MF-RX250/72-0 or MF-RX250/72-AP be used as direct replacements for MF-RX250-AP?

A: Yes. Both substitute parts maintain identical current hold, trip, and time-to-trip specifications. The increased voltage rating (72V) is compatible with circuits designed for 60V operation, as the component will not be exposed to voltages exceeding its original 60V design specification.

Q: What is the difference between MF-RX250/72-0 and MF-RX250/72-AP?

A: The electrical and mechanical specifications are identical. The difference is packaging: MF-RX250/72-0 is supplied in Bulk packaging, while MF-RX250/72-AP is supplied in Tape & Box format. Select based on assembly process requirements.

Q: Are all three parts certified to the same standards?

A: Yes. MF-RX250-AP, MF-RX250/72-0, and MF-RX250/72-AP all carry cURus and TUV approvals, maintain ROHS3 compliance, and are REACH unaffected.

Q: Will the higher voltage rating of the substitute parts affect circuit performance?

A: No. The 72V rating of the substitute parts is a maximum rating specification. In circuits operating at 60V or below, the component will function identically to the original MF-RX250-AP.

Q: What is the lead spacing for these components?

A: All three parts have identical lead spacing of 0.402" (10.20mm), ensuring direct PCB compatibility without layout modifications.