Equivalent & Substitute Parts for MF-R250-0-99

Part Overview

The MF-R250-0-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component is rated for 30V maximum voltage with a 2.5A hold current and 5A trip current, designed for through-hole radial mounting in disc configuration. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and component sourcing.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	2.5 A
Current - Trip (It)	5 A
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

Substitution for the MF-R250-0-99 is determined by strict equivalence across the following critical parameters:

Voltage rating: 30V maximum
Hold current (Ih): 2.5A maximum
Trip current (It): 5A
Initial resistance (Ri): 25 mOhms minimum
Post-trip resistance (R1): 70 mOhms maximum
Operating temperature range: -40°C to 85°C
Mounting configuration: Through-hole radial disc
Physical dimensions and lead spacing compatibility

Substitute parts are grouped into two categories:

Parametric Equivalents (Bourns Inc. MF-R Series): Parts MF-R250, MF-R250-0-10, MF-R250-0-14, and MF-R250U maintain identical electrical specifications and physical form factors. These differ only in packaging format or internal qualification ratings. MF-R250-0-14 includes AEC-Q200 automotive qualification.

Direct Manufacturer Alternatives: RUEF250 (Littelfuse Inc., PolySwitch® series) and PFRA.250 (SCHURTER Inc., PFRA series) provide functional equivalence with minor dimensional variations within acceptable tolerances and identical electrical performance at the specified operating point.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Ri (Min)	R1 (Max)	Operating Temp	Product Status	Inventory
MF-R250-0-99	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Obsolete	736 Pcs
MF-R250	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Active	3200 Pcs
MF-R250-0-10	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Active	5758 Pcs
MF-R250-0-14	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Active	4140 Pcs
MF-R250U	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Active	1140 Pcs
RUEF250	Littelfuse Inc.	30V	2.5 A	5 A	20 mOhms	70 mOhms	Not specified	Active	5274 Pcs
PFRA.250	SCHURTER Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Active	1251 Pcs

Engineering Selection Recommendations

For applications currently using MF-R250-0-99, the following selection criteria apply:

Primary Recommendation: MF-R250-0-10 (Bourns Inc.) is the direct active-status equivalent with highest inventory availability (5758 pcs) and identical electrical and mechanical specifications. This part maintains full compatibility with existing PCB layouts and circuit designs.

Alternative within Bourns MF-R Series: MF-R250-0-14 is suitable for applications requiring AEC-Q200 automotive qualification. This part carries additional certifications (cUL, cURus, TUV, UL) beyond the base MF-R250-0-99 specification.

Cross-Manufacturer Alternatives: RUEF250 (Littelfuse Inc.) and PFRA.250 (SCHURTER Inc.) are functionally equivalent with ROHS3 compliance and appropriate regulatory certifications. RUEF250 features lower initial resistance (20 mOhms vs. 25 mOhms) and higher maximum current rating (100A vs. 40A), which may provide additional design margin in specific applications. PFRA.250 maintains identical specifications to the original part.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MF-R250-0-10 be used as a direct replacement for MF-R250-0-99?

A: Yes. MF-R250-0-10 is a parametric equivalent with identical voltage, current, resistance, and temperature specifications. The primary difference is product status (active vs. obsolete) and packaging format. Physical dimensions and lead spacing are identical, ensuring PCB compatibility.

Q: What is the difference between MF-R250, MF-R250-0-10, MF-R250-0-14, and MF-R250U?

A: All four parts share identical electrical specifications (30V, 2.5A hold, 5A trip, 25 mOhms initial resistance, 70 mOhms post-trip). The suffix designations indicate different packaging formats or qualification levels. MF-R250-0-14 includes AEC-Q200 automotive qualification. All are active products with higher inventory availability than the obsolete MF-R250-0-99.

Q: Is RUEF250 compatible with MF-R250-0-99?

A: RUEF250 is functionally compatible for the specified 30V, 2.5A hold, 5A trip operating point. Physical dimensions are similar (0.449" L vs. 0.472" L) with lead spacing within tolerance (0.199" vs. 0.201"). Initial resistance is lower (20 mOhms vs. 25 mOhms), which may affect circuit behavior in applications sensitive to fuse resistance. Operating temperature range is not specified for RUEF250.

Q: What are the key differences between Bourns MF-R and Littelfuse RUEF series?

A: Both series meet the 30V, 2.5A hold, 5A trip specification. RUEF250 has lower initial resistance (20 mOhms) and higher maximum current rating (100A vs. 40A). Bourns MF-R parts specify operating temperature range (-40°C to 85°C); Littelfuse RUEF250 does not. Both are ROHS3 compliant with appropriate regulatory certifications.

Q: Can PFRA.250 replace MF-R250-0-99?

A: Yes. PFRA.250 (SCHURTER Inc.) maintains identical electrical specifications and physical dimensions. It is an active product with ROHS3 compliance and appropriate certifications (cURus, TUV). Inventory availability is lower (1251 pcs) compared to Bourns alternatives.

Q: Which substitute part has the best inventory availability?

A: MF-R250-0-10 (Bourns Inc.) has the highest inventory at 5758 pcs, followed by MF-R250-0-14 at 4140 pcs and RUEF250 at 5274 pcs. All three provide immediate sourcing capability.

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