Equivalent & Substitute Parts for MF-R500-0-99

Part Overview

The MF-R500-0-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 30V maximum voltage and 5A hold current. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. The part functions as a thermal protection device in through-hole radial configuration, suitable for circuit protection applications requiring automatic reset capability.

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)
Lead Spacing	0.402" (10.20mm)
Type	Polymeric

Substitute Part Grouping Explanation

Substitution eligibility for the MF-R500-0-99 is determined by strict equivalence across the following critical parameters:

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)
Lead Spacing: 0.402" (10.20mm)

All identified substitute parts match these parameters exactly. Substitutes include both Bourns Inc. active alternatives and cross-manufacturer equivalents from SCHURTER Inc.

Parameter Comparison

Parameter	MF-R500-0-99	MF-R500	MF-R500-0-14	PFRA.500
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	SCHURTER Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - Max	30V	30V	30V	30V
Current - Hold (Ih) (Max)	5 A	5 A	5 A	5 A
Current - Trip (It)	10 A	10 A	10 A	10 A
Current - Max	40 A	40 A	40 A	40 A
Time to Trip	14.5 s	14.5 s	14.5 s	14.5 s
Resistance - Initial (Ri) (Min)	10 mOhms	10 mOhms	10 mOhms	10 mOhms
Resistance - Post Trip (R1) (Max)	50 mOhms	50 mOhms	50 mOhms	50 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	0.685" 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)	0.685" L x 0.118" W (17.40mm x 3.00mm)
Lead Spacing	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)
Type	Polymeric	Polymeric	Polymeric	Polymeric
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Approval Agency	cURus, TUV	cURus, TUV	cUL, cURus, TUV, UL	cURus, TUV

Engineering Selection Recommendations

For applications currently using MF-R500-0-99, the following active alternatives are available:

MF-R500 (Bourns Inc.) represents the direct base product number equivalent with active product status and higher inventory availability (6152 pcs). This part maintains identical electrical and mechanical specifications with ROHS3 compliance and cURus/TUV certifications.

MF-R500-0-14 (Bourns Inc.) provides an active alternative with expanded approval agency certifications including cUL and UL in addition to cURus and TUV. This variant includes AEC-Q200 automotive qualification rating and maintains 825 pcs inventory.

PFRA.500 (SCHURTER Inc.) offers cross-manufacturer equivalence with identical parametric specifications and active product status. This part carries 1745 pcs inventory and maintains cURus/TUV certifications with ROHS3 compliance.

All three substitutes are suitable for direct replacement based on product status and regulatory compliance. Selection should consider manufacturer preference, inventory availability, and specific application certifications required.

Frequently Asked Questions (FAQ)

Q: Can MF-R500-0-99 be directly replaced with MF-R500?

A: Yes. MF-R500 is the active base product number with identical electrical parameters (30V, 5A hold current, 10A trip current, 14.5s trip time) and mechanical specifications (through-hole radial, 17.40mm x 3.00mm dimensions, 10.20mm lead spacing). Both maintain ROHS3 compliance and equivalent certifications.

Q: What is the difference between MF-R500 and MF-R500-0-14?

A: Both parts share identical electrical and mechanical specifications. MF-R500-0-14 includes additional approval certifications (cUL and UL) and AEC-Q200 automotive qualification. Selection depends on application requirements for automotive or expanded certification scope.

Q: Is PFRA.500 from SCHURTER Inc. a suitable cross-manufacturer substitute?

A: Yes. PFRA.500 matches all critical electrical parameters (30V maximum voltage, 5A hold current, 10A trip current, 14.5s trip time) and mechanical specifications (through-hole radial, identical dimensions and lead spacing). The part is active with ROHS3 compliance and cURus/TUV certifications.

Q: Are there any differences in operating temperature range among the substitutes?

A: No. All substitute parts operate across the identical temperature range of -40°C to 85°C.

Q: What certifications apply to each substitute part?

A: MF-R500 and PFRA.500 carry cURus and TUV certifications. MF-R500-0-14 includes expanded certifications: cUL, cURus, TUV, and UL, with additional AEC-Q200 automotive qualification.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. All substitute parts maintain identical through-hole radial package configuration, 17.40mm x 3.00mm dimensions, and 10.20mm lead spacing, enabling direct PCB footprint compatibility.

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