MF-R500-2-99 Equivalent & Substitute Parts

Part Overview

The MF-R500-2-99 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 5A hold current and 10A trip current, designed for through-hole radial mounting in disc configuration. The part is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	5 A
Current - Trip (It)	10 A
Current - Max	40 A
Time to Trip	14.5 s
Resistance - Initial (Ri) (Min)	10 mOhms
Resistance - Post Trip (R1) (Max)	50 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.685" L x 0.118" W (17.40mm x 3.00mm)
Height - Seated (Max)	0.980" (24.90mm)
Lead Spacing	0.402" (10.20mm)
Type	Polymeric
Series	Multifuse®, MF-R
RoHS Status	ROHS3 Compliant
Approval Agency	cURus, TUV

Substitute Part Grouping Explanation

Substitute parts for the MF-R500-2-99 are identified based on strict electrical and mechanical parameter matching within the Multifuse® MF-R series. The substitution criteria are:

Electrical Parameters (Must Match):

Voltage - Max: 30V
Current - Hold (Ih) (Max): 5 A
Current - Trip (It): 10 A
Current - Max: 40 A
Time to Trip: 14.5 s
Resistance - Initial (Ri) (Min): 10 mOhms
Resistance - Post Trip (R1) (Max): 50 mOhms
Operating Temperature: -40°C ~ 85°C

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: Radial, Disc
Size / Dimension: 0.685" L x 0.118" W (17.40mm x 3.00mm)
Height - Seated (Max): 0.980" (24.90mm)
Lead Spacing: 0.402" (10.20mm)

Compliance Parameters (Must Match):

Type: Polymeric
Series: Multifuse®, MF-R
RoHS Status: ROHS3 Compliant

The identified substitutes differ only in packaging format and product status, with all electrical and mechanical specifications remaining identical.

Parameter Comparison

Parameter	MF-R500-2-99 (Main)	MF-R500-2 (Substitute)	MF-R500-2-14 (Substitute)
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.
Series	Multifuse®, MF-R	Multifuse®, MF-R	Multifuse®, MF-R
Type	Polymeric	Polymeric	Polymeric
Voltage - Max	30V	30V	30V
Current - Hold (Ih) (Max)	5 A	5 A	5 A
Current - Trip (It)	10 A	10 A	10 A
Current - Max	40 A	40 A	40 A
Time to Trip	14.5 s	14.5 s	14.5 s
Resistance - Initial (Ri) (Min)	10 mOhms	10 mOhms	10 mOhms
Resistance - Post Trip (R1) (Max)	50 mOhms	50 mOhms	50 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	0.685" L x 0.118" W (17.40mm x 3.00mm)	0.685" L x 0.118" W (17.40mm x 3.00mm)	0.685" L x 0.118" W (17.40mm x 3.00mm)
Height - Seated (Max)	0.980" (24.90mm)	0.980" (24.90mm)	0.980" (24.90mm)
Lead Spacing	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active
Packaging Format	Bulk	Cut Tape (CT)	Tape & Reel (TR)
Approval Agency	cURus, TUV	cURus, TUV	cUL, cURus, TUV, UL

Engineering Selection Recommendations

Both MF-R500-2 and MF-R500-2-14 are direct functional equivalents to the obsolete MF-R500-2-99, with identical electrical and mechanical specifications. Selection between these substitutes is determined by procurement and assembly requirements:

MF-R500-2 (Cut Tape Packaging): Suitable for applications requiring standard component tape format. Maintains active product status with full Bourns support and availability.

MF-R500-2-14 (Tape & Reel Packaging): Recommended for high-volume production environments. Includes expanded approval certifications (cUL, cURus, TUV, UL) and AEC-Q200 automotive qualification rating, providing additional compliance coverage for regulated applications.

Both substitutes maintain ROHS3 compliance and identical thermal operating range (-40°C ~ 85°C), ensuring compatibility with existing thermal management designs.

Frequently Asked Questions (FAQ)

Q: Can MF-R500-2 and MF-R500-2-14 be used interchangeably with MF-R500-2-99?

A: Yes. All three parts share identical electrical parameters (30V, 5A hold current, 10A trip current, 14.5s trip time), mechanical dimensions, and thermal specifications. The differences are limited to packaging format and product status. MF-R500-2-99 is obsolete; MF-R500-2 and MF-R500-2-14 are active alternatives.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in standard component tape format suitable for manual or semi-automated assembly. Tape & Reel packaging is wound on reels for high-speed automated pick-and-place equipment. Both formats contain identical components; packaging selection depends on assembly process requirements.

Q: Does MF-R500-2-14 offer additional compliance benefits?

A: MF-R500-2-14 includes AEC-Q200 automotive qualification and expanded approval certifications (cUL, cURus, TUV, UL) compared to MF-R500-2 (cURus, TUV). This provides broader regulatory coverage for applications requiring automotive or extended certification scope.

Q: Are there any thermal or electrical performance differences between the substitutes?

A: No. All three parts maintain identical operating temperature range (-40°C ~ 85°C), initial resistance (10 mOhms minimum), post-trip resistance (50 mOhms maximum), and trip characteristics (14.5s at specified current levels).

Q: What inventory status should be considered for procurement?

A: MF-R500-2-99 is obsolete with limited remaining stock (1080 pcs). MF-R500-2 (2670 pcs) and MF-R500-2-14 (882 pcs) are both active products with current availability. For new designs or ongoing production, MF-R500-2 or MF-R500-2-14 should be specified.

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