MF-RX250-0-99 Equivalent & Substitute Parts

Part Overview

The Bourns MF-RX250-0-99 is a polymeric PTC resettable fuse rated for 60V at 2.5A hold current, designed for through-hole radial mounting in disc configuration. This component is classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability for new production and field replacements.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	2.5 A
Current - Trip (It)	5 A
Current - Max	40 A
Time to Trip	15.6 s
Resistance - Initial (Ri) (Min)	50 mOhms
Resistance - Post Trip (R1) (Max)	130 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.839" L x 0.122" W (21.30mm x 3.10mm)
Lead Spacing	0.402" (10.20mm)
Approval Agency	cURus, TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MF-RX250-0-99 is determined by strict equivalence across the following critical parameters:

Voltage rating (60V maximum)
Current hold rating (2.5A maximum)
Current trip rating (5A)
Mounting configuration (through-hole radial disc)
Physical dimensions and lead spacing
Thermal operating range (-40°C to 85°C)
Regulatory compliance (cURus, TUV, ROHS3)

Substitute parts must match all specified electrical and mechanical parameters to ensure direct functional replacement without circuit redesign or PCB modification.

Parameter Comparison

Parameter	MF-RX250-0-99	MF-RX250-005	MF-RX250/72-0
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.
Product Status	Obsolete	Active	Active
Voltage - Max	60V	60V	72V
Current - Hold (Ih) (Max)	2.5 A	2.5 A	2.5 A
Current - Trip (It)	5 A	5 A	5 A
Current - Max	40 A	40 A	40 A
Time to Trip	15.6 s	15.6 s	15.6 s
Resistance - Initial (Ri) (Min)	50 mOhms	50 mOhms	50 mOhms
Resistance - Post Trip (R1) (Max)	130 mOhms	130 mOhms	130 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	0.839" L x 0.122" W (21.30mm x 3.10mm)	0.839" L x 0.122" W (21.30mm x 3.10mm)	0.839" L x 0.122" W (21.30mm x 3.10mm)
Lead Spacing	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	823 Pcs (Obsolete)	1102 Pcs (Active)	4076 Pcs (Active)

Engineering Selection Recommendations

MF-RX250-005 is the direct parametric equivalent to MF-RX250-0-99. Both components share identical electrical specifications, physical dimensions, and regulatory certifications. The primary distinction is product status: MF-RX250-005 is active and maintains current manufacturing support, while MF-RX250-0-99 is obsolete. For new designs and ongoing production, MF-RX250-005 is the recommended replacement.

MF-RX250/72-0 is functionally compatible for applications where the circuit voltage does not exceed 60V. This part features a higher maximum voltage rating of 72V while maintaining all other electrical and mechanical parameters. Selection of MF-RX250/72-0 is appropriate when higher voltage margin is required or when supply constraints favor this variant. All three parts carry identical cURus and TUV approvals and maintain ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can MF-RX250-005 be used as a direct replacement for MF-RX250-0-99?

A: Yes. MF-RX250-005 is a parametric equivalent with identical voltage, current, thermal, and mechanical specifications. No circuit modification or PCB redesign is required.

Q: What is the difference between MF-RX250-0-99 and MF-RX250/72-0?

A: The primary difference is maximum voltage rating: MF-RX250-0-99 is rated for 60V, while MF-RX250/72-0 is rated for 72V. All other electrical parameters, physical dimensions, and certifications are identical. MF-RX250/72-0 can be used in 60V applications as a higher-voltage-rated alternative.

Q: Are there any packaging differences between these parts?

A: MF-RX250-0-99 and MF-RX250-005 share identical through-hole radial disc packaging with 0.402" (10.20mm) lead spacing. MF-RX250/72-0 is supplied in bulk packaging but maintains the same physical form factor and lead spacing.

Q: Do all three parts meet the same regulatory standards?

A: Yes. All three parts carry cURus and TUV approvals and are ROHS3 compliant. Moisture sensitivity level is 1 (unlimited) for all variants.

Q: Which part should be selected for new production?

A: MF-RX250-005 is recommended for new production due to active product status and established supply chain availability. MF-RX250/72-0 is an acceptable alternative if higher voltage margin is required or if supply conditions favor this variant.

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