Equivalent & Substitute Parts for MF-R110-2-99

Part Overview

The MF-R110-2-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component is rated for 30V maximum voltage with a 1.1A hold current and 2.2A trip current, designed for through-hole radial mounting in disc configuration. The MF-R110-2-99 is currently listed as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	1.1 A
Current - Trip (It)	2.2 A
Current - Max	40 A
Time to Trip	6.6 s
Resistance - Initial (Ri) (Min)	100 mOhms
Resistance - Post Trip (R1) (Max)	270 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.350" Dia x 0.118" T (8.90mm x 3.00mm)
Lead Spacing	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant
Approval Agency	cURus, TUV

Substitute Part Grouping Explanation

Substitution of the MF-R110-2-99 is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage rating: 30V maximum
Hold current: 1.1A maximum
Trip current: 2.2A
Time to trip: 6.6 seconds
Initial resistance: 100 mOhms minimum
Post-trip resistance: 270 mOhms maximum
Operating temperature range: -40°C to 85°C
Mounting configuration: Through-hole radial disc
Physical dimensions: 0.350" diameter x 0.118" thickness (8.90mm x 3.00mm)
Lead spacing: 0.201" (5.10mm)

All identified substitute parts maintain identical electrical characteristics and mechanical form factors. Differences exist only in product status, packaging format, and regulatory certifications.

Parameter Comparison

Parameter	MF-R110-2-99	MF-R110-2	MF-R110-2-17	MF-R110-AP
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Bourns Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - Max	30V	30V	30V	30V
Current - Hold (Ih) (Max)	1.1 A	1.1 A	1.1 A	1.1 A
Current - Trip (It)	2.2 A	2.2 A	2.2 A	2.2 A
Current - Max	40 A	40 A	40 A	40 A
Time to Trip	6.6 s	6.6 s	6.6 s	6.6 s
Resistance - Initial (Ri) (Min)	100 mOhms	100 mOhms	100 mOhms	100 mOhms
Resistance - Post Trip (R1) (Max)	270 mOhms	270 mOhms	270 mOhms	270 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.350" Dia x 0.118" T (8.90mm x 3.00mm)	0.350" Dia x 0.118" T (8.90mm x 3.00mm)	0.350" Dia x 0.118" T (8.90mm x 3.00mm)	0.350" Dia x 0.118" T (8.90mm x 3.00mm)
Lead Spacing	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)
Packaging Format	-	Cut Tape (CT)	Tape & Reel (TR)	Cut Tape (CT)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV	cUL, cURus, TUV, UL	cURus, TUV

Engineering Selection Recommendations

All three substitute parts—MF-R110-2, MF-R110-2-17, and MF-R110-AP—are electrically and mechanically equivalent to the obsolete MF-R110-2-99. Selection among these active alternatives depends on procurement and regulatory requirements:

MF-R110-2 is available in Cut Tape packaging with standard cURus and TUV certifications. This part maintains the baseline compliance profile of the original component.

MF-R110-2-17 is available in Tape & Reel packaging and carries expanded regulatory approvals including cUL and UL certifications in addition to cURus and TUV. This part is suitable for applications requiring broader certification coverage.

MF-R110-AP is available in Cut Tape packaging with cURus and TUV certifications, matching the certification scope of MF-R110-2.

All substitute parts comply with ROHS3 requirements and maintain identical electrical performance across the specified operating temperature range of -40°C to 85°C.

Frequently Asked Questions (FAQ)

Q: Can MF-R110-2, MF-R110-2-17, and MF-R110-AP be used interchangeably with MF-R110-2-99?

A: Yes. All three parts are parametric equivalents with identical electrical ratings (30V, 1.1A hold current, 2.2A trip current) and mechanical dimensions (0.350" diameter x 0.118" thickness, 0.201" lead spacing). They are direct functional replacements for through-hole radial disc mounting applications.

Q: What is the difference between the packaging formats?

A: MF-R110-2 and MF-R110-AP are supplied in Cut Tape (CT) format, suitable for manual handling and small-quantity assembly. MF-R110-2-17 is supplied in Tape & Reel (TR) format, designed for automated pick-and-place assembly processes. Electrical and mechanical specifications are identical across all packaging formats.

Q: Does MF-R110-2-17 offer additional compliance benefits?

A: MF-R110-2-17 includes cUL and UL certifications in addition to the cURus and TUV certifications present on MF-R110-2 and MF-R110-AP. Applications requiring North American regulatory compliance may benefit from these additional approvals.

Q: Are all substitute parts RoHS compliant?

A: Yes. MF-R110-2, MF-R110-2-17, and MF-R110-AP are all ROHS3 compliant, matching the environmental compliance status of the original MF-R110-2-99.

Q: What determines whether a part can substitute for MF-R110-2-99?

A: Substitution is determined by equivalence in voltage rating, hold current, trip current, time to trip, initial and post-trip resistance, operating temperature range, mounting type, and physical dimensions. All identified substitute parts meet these criteria.

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