MF-R250-AP-99 Equivalent & Substitute Parts

Part Overview

The MF-R250-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 2.5A hold current and 5A trip current in a through-hole radial disc package. The MF-R250-AP-99 is classified 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)	2.5 A
Current - Trip (It)	5 A
Current - Max	40 A
Time to Trip	10.3 s
Resistance - Initial (Ri) (Min)	25 mOhms
Resistance - Post Trip (R1) (Max)	70 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.472" L x 0.118" W (12.00mm 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-R250-AP-99 is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage rating: 30V maximum
Current hold specification: 2.5A maximum
Current trip specification: 5A
Time to trip: 10.3 seconds
Initial resistance: 25 mOhms minimum
Post-trip resistance: 70 mOhms maximum
Operating temperature range: -40°C to 85°C
Mounting configuration: Through hole radial disc
Physical dimensions: 12.00mm L x 3.00mm W with 5.10mm lead spacing
Compliance: ROHS3 compliant

All identified substitute parts maintain identical electrical performance and mechanical compatibility with the original MF-R250-AP-99 specification. Differences exist only in product status (active vs. obsolete), packaging format, and regulatory certifications.

Parameter Comparison

Parameter	MF-R250-AP-99	MF-R250-2-10	MF-R250-AP	MF-R250-AP-10	MF-R250-AP-14	MF-R250U-AP
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Bourns Inc.	Bourns Inc.	Bourns Inc.
Series	Multifuse®, MF-R	Multifuse®, MF-R	Multifuse®, MF-R	Multifuse®, MF-R	Multifuse®, MF-R	Multifuse®, MF-R
Product Status	Obsolete	Active	Active	Active	Active	Active
Type	Polymeric	Polymeric	Polymeric	Polymeric	Polymeric	Polymeric
Voltage - Max	30V	30V	30V	30V	30V	30V
Current - Hold (Ih) (Max)	2.5 A	2.5 A	2.5 A	2.5 A	2.5 A	2.5 A
Current - Trip (It)	5 A	5 A	5 A	5 A	5 A	5 A
Current - Max	40 A	40 A	40 A	40 A	40 A	40 A
Time to Trip	10.3 s	10.3 s	10.3 s	10.3 s	10.3 s	10.3 s
Resistance - Initial (Ri) (Min)	25 mOhms	25 mOhms	25 mOhms	25 mOhms	25 mOhms	25 mOhms
Resistance - Post Trip (R1) (Max)	70 mOhms	70 mOhms	70 mOhms	70 mOhms	70 mOhms	70 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-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	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.472" L x 0.118" W (12.00mm x 3.00mm)	0.472" L x 0.118" W (12.00mm x 3.00mm)	0.472" L x 0.118" W (12.00mm x 3.00mm)	0.472" L x 0.118" W (12.00mm x 3.00mm)	0.472" L x 0.118" W (12.00mm x 3.00mm)	0.472" L x 0.118" W (12.00mm x 3.00mm)
Lead Spacing	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV	cUL, cURus, TUV, UL	cURus, TUV
Packaging Format	Bulk	Cut Tape (CT)	Cut Tape (CT)	Cut Tape (CT)	Tape & Box (TB)	Tape & Box (TB)

Engineering Selection Recommendations

All substitute parts are parametrically equivalent to the MF-R250-AP-99 and provide direct functional replacement. Selection among active alternatives should be based on:

Product Status: All substitute parts carry active product status, ensuring long-term availability and manufacturing support. The MF-R250-AP-99 is obsolete and should be replaced in new designs.

Regulatory Compliance: MF-R250-AP-14 provides the broadest certification coverage with cUL, cURus, TUV, and UL approvals, compared to cURus and TUV for other variants. This part is suitable for applications requiring automotive qualification (AEC-Q200 rating).

Packaging Availability:

MF-R250-2-10, MF-R250-AP, and MF-R250-AP-10 are supplied in Cut Tape format
MF-R250-AP-14 and MF-R250U-AP are supplied in Tape & Box format

Inventory Levels: MF-R250-AP-10 maintains the highest stock level (12,283 pcs), followed by MF-R250-2-10 (4,287 pcs) and MF-R250-AP (3,610 pcs).

Frequently Asked Questions (FAQ)

Q: Can MF-R250-AP-99 be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts maintain identical electrical specifications (30V, 2.5A hold, 5A trip) and mechanical dimensions (12.00mm x 3.00mm radial disc, 5.10mm lead spacing). Direct PCB-level substitution is supported without circuit modification.

Q: What is the difference between the substitute parts?

A: Differences are limited to product status (all substitutes are active), packaging format (Cut Tape vs. Tape & Box), and regulatory certifications. MF-R250-AP-14 includes automotive-grade AEC-Q200 qualification and expanded agency approvals (cUL, UL in addition to cURus, TUV).

Q: Which substitute should be selected for new designs?

A: For general applications, MF-R250-AP-10 is recommended due to active status, high availability, and standard certifications. For automotive or safety-critical applications, MF-R250-AP-14 is preferred due to AEC-Q200 rating and expanded regulatory approvals.

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

A: No. All parts share identical operating temperature range (-40°C to 85°C), time-to-trip specification (10.3 seconds), and resistance characteristics (25 mOhms initial, 70 mOhms post-trip maximum).

Q: Does packaging format affect electrical performance?

A: No. Cut Tape and Tape & Box formats are packaging and delivery methods only. Electrical and mechanical specifications remain identical across all packaging variants.

Q: What certifications apply to each substitute?

A: MF-R250-AP-14 carries cUL, cURus, TUV, and UL approvals with AEC-Q200 automotive qualification. MF-R250-2-10, MF-R250-AP, MF-R250-AP-10, and MF-R250U-AP carry cURus and TUV approvals. All parts are ROHS3 compliant and REACH unaffected.

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