MF-R185-AP-99 Equivalent & Substitute Parts

Part Overview

The MF-R185-AP-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component provides overcurrent protection at 30V with a 1.85A hold current rating and is designed for through-hole radial mounting in disc configuration. The MF-R185-AP-99 is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	1.85 A
Current - Trip (It)	3.7 A
Current - Max	40 A
Time to Trip	8.7 s
Resistance - Initial (Ri) (Min)	40 mOhms
Resistance - Post Trip (R1) (Max)	110 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.472" Dia x 0.118" T (12.00mm x 3.00mm)
Lead Spacing	0.201" (5.10mm)
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MF-R185-AP-99 is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage rating: 30V maximum
Hold current (Ih): 1.85A maximum
Trip current (It): 3.7A
Time to trip: 8.7 seconds
Initial resistance (Ri): 40 mOhms minimum
Post-trip resistance (R1): 110 mOhms maximum
Operating temperature range: -40°C to 85°C
Mounting configuration: Through-hole radial disc
Physical dimensions: 12.00mm diameter x 3.00mm thickness
Lead spacing: 5.10mm

The substitute parts MF-R185-AP and MF-R185-AP-17 maintain identical electrical characteristics and mechanical form factors. Differences exist only in product status (active vs. obsolete), packaging format (Cut Tape vs. Tape & Box), and certification scope.

Parameter Comparison

Parameter	MF-R185-AP-99 (Main)	MF-R185-AP	MF-R185-AP-17
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.
Series	Multifuse® MF-R	Multifuse® MF-R	Multifuse® MF-R
Product Status	Obsolete	Active	Active
Type	Polymeric	Polymeric	Polymeric
Voltage - Max	30V	30V	30V
Current - Hold (Ih) (Max)	1.85 A	1.85 A	1.85 A
Current - Trip (It)	3.7 A	3.7 A	3.7 A
Current - Max	40 A	40 A	40 A
Time to Trip	8.7 s	8.7 s	8.7 s
Resistance - Initial (Ri) (Min)	40 mOhms	40 mOhms	40 mOhms
Resistance - Post Trip (R1) (Max)	110 mOhms	110 mOhms	110 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.472" Dia x 0.118" T (12.00mm x 3.00mm)	0.472" Dia x 0.118" T (12.00mm x 3.00mm)	0.472" Dia x 0.118" T (12.00mm x 3.00mm)
Height - Seated (Max)	0.724" (18.40mm)	0.724" (18.40mm)	0.724" (18.40mm)
Lead Spacing	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)
Approval Agency	cURus, TUV	cURus, TUV	cUL, cURus, TUV, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	-	Cut Tape (CT)	Tape & Box (TB)

Engineering Selection Recommendations

Both MF-R185-AP and MF-R185-AP-17 are direct functional equivalents to the obsolete MF-R185-AP-99, with identical electrical performance and mechanical compatibility.

MF-R185-AP is the primary active substitute, maintaining the same certification scope (cURus, TUV) as the original part and supplied in Cut Tape packaging format.

MF-R185-AP-17 provides expanded regulatory coverage with additional certifications (cUL, UL) and is supplied in Tape & Box packaging. This variant is suitable for applications requiring broader approval agency compliance.

Selection between these two active substitutes depends on packaging requirements and certification scope needed for the target application. Both parts are electrically and mechanically interchangeable with the MF-R185-AP-99.

Frequently Asked Questions (FAQ)

Q: Can MF-R185-AP and MF-R185-AP-17 be used interchangeably with MF-R185-AP-99?

A: Yes. All three parts share identical electrical ratings (30V, 1.85A hold current, 3.7A trip current, 8.7s trip time), resistance characteristics, and mechanical dimensions. The primary differences are product status and packaging format.

Q: What is the difference between MF-R185-AP and MF-R185-AP-17?

A: Both parts are electrically and mechanically identical. MF-R185-AP is supplied in Cut Tape (CT) packaging, while MF-R185-AP-17 is supplied in Tape & Box (TB) packaging. MF-R185-AP-17 includes additional certifications (cUL, UL) beyond the base cURus and TUV approvals.

Q: Why is MF-R185-AP-99 listed as obsolete?

A: The MF-R185-AP-99 has been discontinued by the manufacturer. Active equivalents MF-R185-AP and MF-R185-AP-17 are available for new designs and ongoing procurement.

Q: Are there any differences in thermal performance between these parts?

A: No. All three parts operate across the same temperature range (-40°C to 85°C) and maintain identical thermal characteristics.

Q: Which packaging format should I select for new designs?

A: Packaging selection depends on assembly requirements. Cut Tape (CT) format is suitable for automated pick-and-place assembly, while Tape & Box (TB) format provides additional packaging protection. Both formats contain the same component.

Q: Do all three parts meet RoHS compliance?

A: Yes. MF-R185-AP-99, MF-R185-AP, and MF-R185-AP-17 are all ROHS3 compliant.

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