MF-R090-0-99 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The Bourns MF-R090-0-99 is a polymeric PTC resettable fuse rated for 60V at 900 mA hold current, designed for through-hole radial mounting in disc configuration. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production support and design continuity. Substitute parts must maintain electrical performance characteristics while offering current product availability and active manufacturer support.

Substiute Parts

MF-R090-0-99

Bourns Inc.In Stock: 1048MF-R090-0-99 Datasheet

Current PartRFQ

PFRA.090

SCHURTER Inc.In Stock: 1477PFRA.090 Datasheet

DirectRFQ

RXEF090

LittelfuseIn Stock: 2700RXEF090 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for polymeric PTC resettable fuses is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Voltage rating must equal or exceed the original specification (60V minimum)
• Current hold (Ih) rating must match the original specification (900 mA)
• Current trip (It) and maximum current ratings must be identical
• Time to trip characteristic must match (7.2 s)
• Resistance values (initial and post-trip) must fall within acceptable ranges

Mechanical Compatibility Requirements:

• Mounting type must be through-hole radial
• Package configuration must be radial disc
• Lead spacing must accommodate PCB hole patterns (0.201 inches / 5.10 mm nominal)

Regulatory & Compliance Requirements:

• RoHS3 compliance mandatory
• Approval agencies must include recognized standards bodies (cURus, TUV, UL, CSA, CQC)

The identified substitute parts meet these criteria with the following considerations:

PFRA.090 (SCHURTER Inc.): Matches all electrical parameters and mounting specifications. Active product status. Identical lead spacing. Dimensional variations in disc diameter and height do not affect electrical performance or PCB compatibility.

RXEF090 (Littelfuse): Matches all electrical parameters and mounting specifications. Active product status. Voltage rating elevated to 72V provides additional margin. Dimensional variations in disc diameter and height do not affect electrical performance or PCB compatibility. Resistance initial value increased to 200 mOhms remains within acceptable operating range.

Parameter Comparison

Engineering Selection Recommendations

PFRA.090 (SCHURTER Inc.) is the direct electrical equivalent with identical voltage and current specifications. This part maintains all original electrical characteristics and is currently in active production status. Regulatory compliance includes cURus and TUV certifications matching the original part. Lead spacing is identical at 0.201 inches, ensuring direct PCB compatibility without layout modifications.

RXEF090 (Littelfuse) provides equivalent electrical performance with an elevated voltage rating of 72V, offering additional design margin for applications operating near the 60V specification limit. This part is actively manufactured and carries expanded regulatory approvals including CQC, CSA, TUV, and UL certifications. The initial resistance value of 200 mOhms is higher than the original 140 mOhms specification but remains within acceptable operating parameters. Lead spacing of 0.199 inches is nominally compatible with 0.201-inch hole patterns.

Both substitute parts are suitable for direct replacement in applications requiring 60V, 900 mA polymeric PTC resettable fuses with through-hole radial mounting. Selection between PFRA.090 and RXEF090 should be based on supply chain availability, regulatory certification requirements specific to the end application, and any design margin considerations for voltage headroom.

Frequently Asked Questions (FAQ)

Q: Can PFRA.090 and RXEF090 be used interchangeably with MF-R090-0-99?

A: Both parts meet the electrical specifications of the original MF-R090-0-99. PFRA.090 provides identical electrical characteristics. RXEF090 provides equivalent electrical performance with a higher voltage rating. Both are mechanically compatible with through-hole radial PCB layouts designed for 0.201-inch lead spacing. Verification of regulatory certifications required by your application is necessary before final selection.

Q: What is the significance of the voltage rating difference between PFRA.090 (60V) and RXEF090 (72V)?

A: The RXEF090 72V rating provides additional voltage margin above the original 60V specification. Both parts function identically at 60V operation. The higher rating on RXEF090 does not affect performance in circuits designed for 60V maximum operation and may be advantageous in applications with voltage transients or design margin requirements.

Q: Are there dimensional differences that affect PCB mounting?

A: All three parts use identical 0.201-inch (5.10 mm) lead spacing for through-hole mounting. Disc diameter and seated height vary slightly between manufacturers but do not affect PCB hole pattern compatibility or electrical performance. Physical clearance around the component should be verified if space constraints exist in the original design.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. Both PFRA.090 and RXEF090 are RoHS3 compliant, matching the compliance status of the original MF-R090-0-99.

Q: What regulatory certifications are included with each part?

A: MF-R090-0-99 carries cURus and TUV approvals. PFRA.090 carries cURus and TUV approvals. RXEF090 carries CQC, CSA, TUV, and UL approvals. Selection should align with regulatory requirements of the target application and end market.

Q: How do the resistance specifications compare?

A: Initial resistance (Ri) for MF-R090-0-99 and PFRA.090 is 140 mOhms minimum. RXEF090 specifies 200 mOhms minimum. Post-trip resistance (R1) is 470 mOhms maximum for all three parts. The higher initial resistance of RXEF090 remains within acceptable operating parameters and does not affect trip characteristics or hold current performance.