Bourns MF-R090-2-99 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The Bourns MF-R090-2-99 is a polymeric PTC resettable fuse rated for 60V, 900 mA hold current, designed for through-hole radial mounting in disc configuration. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part belongs to the Multifuse® MF-R series and carries ROHS3 compliance with cURus and TUV approvals.

Substiute Parts

MF-R090-2-99

Bourns Inc.In Stock: 721MF-R090-2-99 Datasheet

Current PartRFQ

MF-R090-2

Bourns Inc.In Stock: 18495MF-R090-2 Datasheet

Parametric EquivalentRFQ

MF-R090-2-9

Bourns Inc.In Stock: 1179MF-R090-2-9 Datasheet

Parametric EquivalentRFQ

MF-R090-AP

Bourns Inc.In Stock: 5201MF-R090-AP Datasheet

Parametric EquivalentRFQ

RXEF017-AP

LittelfuseIn Stock: 1385RXEF017-AP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MF-R090-2-99 is determined by strict equivalence across the following critical parameters:

Parametric Equivalents (identical electrical and mechanical specifications):

• Voltage rating: 60V maximum
• Current hold (Ih): 900 mA maximum
• Current trip (It): 1.8 A
• Time to trip: 7.2 s
• Resistance initial (Ri): 140 mOhms minimum
• Resistance post-trip (R1): 470 mOhms maximum
• Operating temperature: -40°C ~ 85°C
• Mounting type: Through hole radial disc
• Physical dimensions and lead spacing

Similar Parts (same voltage and mounting, different current ratings):

• Voltage rating: 60V maximum
• Mounting type: Through hole radial disc
• Operating temperature: -40°C ~ 85°C
• Physical form factor: Radial disc configuration

Parts meeting parametric equivalent criteria are direct functional replacements. Similar parts share the same voltage class and form factor but differ in current-handling specifications and must be evaluated for circuit compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

The parts MF-R090-2, MF-R090-2-9, and MF-R090-AP are parametric equivalents to the obsolete MF-R090-2-99. All three maintain identical electrical specifications (60V, 900 mA hold current, 1.8 A trip current, 7.2 s trip time) and mechanical form factors. The primary distinction is product status: MF-R090-2-99 is obsolete, while MF-R090-2, MF-R090-2-9, and MF-R090-AP are active products. All three active equivalents carry ROHS3 compliance and cURus/TUV approvals, matching the certification profile of the original part. Selection among these three should be based on packaging availability (Cut Tape) and inventory levels.

For Alternative Selection (Similar Parts):

The Littelfuse RXEF017-AP shares the same 60V voltage rating, through-hole radial disc mounting, and operating temperature range. However, it differs significantly in current-handling characteristics: 170 mA hold current versus 900 mA, 340 mA trip current versus 1.8 A, and substantially higher resistance values (3.3 Ohms initial versus 140 mOhms). This part is suitable only for circuits requiring lower current protection thresholds. The RXEF017-AP carries expanded certifications (CQC, CSA, TUV, UL) and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can MF-R090-2, MF-R090-2-9, and MF-R090-AP be used interchangeably with MF-R090-2-99?

A: Yes. These three parts are parametric equivalents with identical electrical and mechanical specifications. They differ only in packaging format (Cut Tape versus the original packaging) and product status (active versus obsolete). All carry equivalent certifications and compliance ratings.

Q: What is the difference between the three active Bourns equivalents?

A: MF-R090-2, MF-R090-2-9, and MF-R090-AP are electrically and mechanically identical. The differences are in packaging (all are Cut Tape) and current inventory levels. MF-R090-2 has the highest inventory (18,413 pcs), followed by MF-R090-AP (5,114 pcs) and MF-R090-2-9 (1,120 pcs).

Q: Can the Littelfuse RXEF017-AP replace the MF-R090-2-99?

A: No, not as a direct replacement. The RXEF017-AP is a similar part only in form factor and voltage rating. It has a 900 mA lower hold current (170 mA versus 900 mA) and a 1.46 A lower trip current (340 mA versus 1.8 A). Use this part only if your circuit requires lower current protection thresholds.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts—MF-R090-2, MF-R090-2-9, MF-R090-AP, and RXEF017-AP—are ROHS3 compliant.

Q: What certifications do the substitute parts carry?

A: The three Bourns parametric equivalents (MF-R090-2, MF-R090-2-9, MF-R090-AP) carry cURus and TUV approvals. The Littelfuse RXEF017-AP carries CQC, CSA, TUV, and UL approvals, providing a broader certification profile.

Q: Are there physical dimension differences between the parts?

A: The three Bourns parametric equivalents have identical dimensions (0.461" L x 0.122" W, 11.70mm x 3.10mm) and lead spacing (0.201", 5.10mm). The Littelfuse RXEF017-AP has a smaller diameter (0.291" versus 0.461") and slightly different lead spacing (0.199" versus 0.201"), though both are compatible with 5.1mm lead spacing PCB layouts.