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

Part Overview

The MF-R250U is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component provides overcurrent protection in through-hole radial configuration with a 30V maximum voltage rating and 2.5A hold current specification. The part is active in production status with ROHS3 compliance and cURus/TUV approval certifications. Substitute parts are identified when electrical parameters, mechanical form factor, and mounting characteristics remain within specified tolerances for direct circuit board replacement.

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

Substitute Part Grouping Explanation

Substitute parts for the MF-R250U are qualified based on the following criteria:

Electrical Parameters (Critical):

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

Mechanical Parameters (Critical):

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)

Compliance Parameters:

RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

All substitute parts listed maintain identical electrical performance characteristics and mechanical compatibility with the MF-R250U, enabling direct circuit board replacement without design modification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih) (Max)	Current - Trip (It)	Current - Max	Time to Trip	Resistance - Initial (Ri) (Min)	Resistance - Post Trip (R1) (Max)	Operating Temperature	Mounting Type	Package / Case	Lead Spacing	RoHS Status	Inventory Status
MF-R250U	Bourns Inc.	30V	2.5 A	5 A	40 A	10.3 s	25 mOhms	70 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	0.201" (5.10mm)	ROHS3 Compliant	1140 Pcs
MF-R250	Bourns Inc.	30V	2.5 A	5 A	40 A	10.3 s	25 mOhms	70 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	0.201" (5.10mm)	ROHS3 Compliant	3200 Pcs
MF-R250-0-10	Bourns Inc.	30V	2.5 A	5 A	40 A	10.3 s	25 mOhms	70 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	0.201" (5.10mm)	ROHS3 Compliant	5758 Pcs
MF-R250-0-14	Bourns Inc.	30V	2.5 A	5 A	40 A	10.3 s	25 mOhms	70 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	0.201" (5.10mm)	ROHS3 Compliant	4140 Pcs
PFRA.250	SCHURTER Inc.	30V	2.5 A	5 A	40 A	10.3 s	25 mOhms	70 mOhms	-40°C ~ 85°C	Through Hole	Radial, Disc	0.201" (5.10mm)	ROHS3 Compliant	1251 Pcs

Engineering Selection Recommendations

Bourns Inc. MF-R Series (MF-R250, MF-R250-0-10, MF-R250-0-14): All Bourns variants maintain active production status with identical electrical and mechanical specifications. MF-R250-0-14 includes expanded approval certifications (cUL, cURus, TUV, UL) and AEC-Q200 automotive qualification rating. Selection among these variants depends on specific application certification requirements and inventory availability.

SCHURTER Inc. PFRA.250: The PFRA.250 provides cross-manufacturer equivalence with identical electrical performance and mechanical form factor. This part is manufactured by SCHURTER Inc. and maintains ROHS3 compliance with cURus and TUV certifications. Cross-manufacturer substitution is appropriate when supply chain diversification or specific vendor requirements are necessary.

Compliance Basis: All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the MF-R250U in applications subject to these standards.

Frequently Asked Questions (FAQ)

Q: Can MF-R250 be used as a direct replacement for MF-R250U? A: Yes. Both parts share identical electrical parameters (30V, 2.5A hold current, 5A trip current, 10.3s trip time), resistance specifications, and mechanical form factor (through-hole radial, 5.10mm lead spacing). Direct circuit board substitution is supported.

Q: What is the difference between MF-R250-0-10 and MF-R250-0-14? A: Both parts maintain identical electrical and mechanical specifications. MF-R250-0-14 includes additional approval certifications (cUL, UL) and AEC-Q200 automotive qualification. Selection depends on application-specific certification requirements.

Q: Is PFRA.250 from SCHURTER Inc. compatible with MF-R250U? A: Yes. The PFRA.250 maintains identical electrical parameters, resistance specifications, operating temperature range, and mechanical dimensions. Cross-manufacturer substitution is supported for applications requiring supply chain alternatives.

Q: What parameters must remain constant for substitution? A: Voltage rating (30V), current hold specification (2.5A), trip current (5A), maximum current (40A), trip time (10.3s), initial resistance (25 mOhms minimum), post-trip resistance (70 mOhms maximum), operating temperature range (-40°C to 85°C), mounting type (through-hole), package configuration (radial disc), and lead spacing (5.10mm) must all remain within specification.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status.

Q: What is the inventory availability for each substitute part? A: MF-R250-0-10 has the highest inventory at 5758 pieces. MF-R250-0-14 has 4140 pieces. MF-R250 has 3200 pieces. PFRA.250 has 1251 pieces. MF-R250U has 1140 pieces in stock.

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