Bourns MF-R250U-AP Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The Bourns MF-R250U-AP is a polymeric PTC resettable fuse rated for 30V maximum voltage with a 2.5A hold current. This component belongs to the Multifuse® MF-R series and is designed for through-hole radial mounting in disc configuration. The part is active in production status with full RoHS3 compliance and cURus/TUV approval certifications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and packaging compatibility to ensure direct circuit board replacement capability.

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)
Height - Seated (Max)	0.720" (18.30mm)
Lead Spacing	0.201" (5.10mm)
Series	Multifuse®, MF-R
Type	Polymeric
RoHS Status	ROHS3 Compliant
Approval Agency	cURus, TUV

Substitute Part Grouping Explanation

Substitute parts for the MF-R250U-AP are identified as parametric equivalents within the Bourns Multifuse® MF-R series. Substitution is based on the following critical parameters that must remain identical:

Voltage rating: 30V maximum
Current hold rating: 2.5A
Current trip rating: 5A
Resistance characteristics: 25 mOhms initial minimum, 70 mOhms post-trip maximum
Operating temperature range: -40°C to 85°C
Mechanical form factor: Through-hole radial disc configuration
Physical dimensions: 12.00mm length x 3.00mm width, 18.30mm seated height, 5.10mm lead spacing
Compliance: RoHS3, cURus/TUV certification

All substitute parts maintain identical electrical performance and mechanical compatibility. Differences exist only in packaging format (tape & box versus cut tape), which does not affect circuit functionality or board-level performance.

Parameter Comparison

Parameter	MF-R250U-AP	MF-R250-2-10	MF-R250-AP	MF-R250-AP-10
Voltage - Max	30V	30V	30V	30V
Current - Hold (Ih) (Max)	2.5 A	2.5 A	2.5 A	2.5 A
Current - Trip (It)	5 A	5 A	5 A	5 A
Current - Max	40 A	40 A	40 A	40 A
Time to Trip	10.3 s	10.3 s	10.3 s	10.3 s
Resistance - Initial (Ri) (Min)	25 mOhms	25 mOhms	25 mOhms	25 mOhms
Resistance - Post Trip (R1) (Max)	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
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	12.00mm x 3.00mm	12.00mm x 3.00mm	12.00mm x 3.00mm	12.00mm x 3.00mm
Height - Seated (Max)	18.30mm	18.30mm	18.30mm	18.30mm
Lead Spacing	5.10mm	5.10mm	5.10mm	5.10mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	cURus, TUV	cURus, TUV	cURus, TUV
Product Status	Active	Active	Active	Active
Packaging Format	Tape & Box (TB)	Cut Tape (CT)	Cut Tape (CT)	Cut Tape (CT)
Inventory Availability	721 Pcs	4287 Pcs	3610 Pcs	12283 Pcs

Engineering Selection Recommendations

All substitute parts—MF-R250-2-10, MF-R250-AP, and MF-R250-AP-10—are direct electrical and mechanical equivalents to the MF-R250U-AP. Selection among these parts should be based on the following factors:

Packaging Requirements: The MF-R250U-AP is supplied in tape and box format, suitable for manual assembly or small-volume production. The substitute parts (MF-R250-2-10, MF-R250-AP, MF-R250-AP-10) are supplied in cut tape format, appropriate for automated pick-and-place assembly or tape-fed component handling systems.

Compliance and Certification: All parts carry identical RoHS3 compliance status and cURus/TUV approval certifications, meeting the same regulatory and safety standards.

Production Status: All parts maintain active production status, ensuring long-term availability and supply chain stability.

Inventory Considerations: MF-R250-AP-10 offers the highest inventory availability at 12,283 pieces, followed by MF-R250-2-10 at 4,287 pieces and MF-R250-AP at 3,610 pieces. The original MF-R250U-AP has 721 pieces in stock.

Frequently Asked Questions (FAQ)

Q: Can MF-R250-2-10, MF-R250-AP, or MF-R250-AP-10 be used as direct replacements for MF-R250U-AP on a circuit board?

A: Yes. All substitute parts are parametric equivalents with identical electrical ratings, trip characteristics, and mechanical dimensions. They will function identically in the circuit and occupy the same board footprint.

Q: What is the difference between tape & box and cut tape packaging?

A: Tape & box packaging (TB) is used for manual component handling and small-volume assembly. Cut tape (CT) packaging is designed for automated assembly equipment with tape feeders. The components themselves are identical; only the delivery format differs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. MF-R250-2-10, MF-R250-AP, and MF-R250-AP-10 all carry ROHS3 compliance certification, matching the compliance status of the MF-R250U-AP.

Q: Do the substitute parts have the same safety certifications?

A: Yes. All substitute parts carry cURus and TUV approval certifications, identical to the MF-R250U-AP.

Q: Can I mix packaging formats in the same production run?

A: Yes. Since all parts are electrically and mechanically identical, mixing tape & box and cut tape formats does not affect circuit performance. However, assembly process compatibility should be verified with your manufacturing equipment.

Q: What is the lead spacing for all these parts?

A: All parts have a lead spacing of 5.10mm (0.201 inches), ensuring compatibility with standard through-hole PCB layouts designed for the MF-R250 series.

Q: Are there any temperature or voltage derating considerations when substituting these parts?

A: No. All substitute parts operate within the identical temperature range (-40°C to 85°C) and voltage rating (30V maximum), with no derating required.

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