MF-R250U-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The Bourns MF-R250U-2 is a polymeric PTC resettable fuse rated for 30V maximum voltage with a 2.5A hold current. This component functions as an automatic reset protective device in electronic circuits, interrupting excessive current flow and restoring normal operation once the fault condition clears. The part is Active status and widely used in power distribution and circuit protection applications. Substitute parts are identified when packaging formats differ or when alternative manufacturers provide identical electrical and mechanical specifications, enabling procurement flexibility and supply chain continuity.

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)
Type	Polymeric
RoHS Status	ROHS3 Compliant
Approval Agency	cURus, TUV

Substitute Part Grouping Explanation

Substitute parts for the MF-R250U-2 are qualified based on strict electrical and mechanical parameter matching. All identified substitutes maintain identical specifications across the following critical parameters: maximum voltage (30V), hold current (2.5A), trip current (5A), maximum current (40A), time to trip (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 type (Radial, Disc), physical dimensions (0.472" L x 0.118" W / 12.00mm x 3.00mm), and lead spacing (0.201" / 5.10mm).

Substitutes are differentiated by packaging format (Tape & Reel versus Cut Tape) and manufacturer. The primary difference between MF-R250U-2 and its Bourns equivalents (MF-R250-2, MF-R250-2-10, MF-R250-AP, MF-R250-AP-10) is packaging configuration. The SCHURTER PFRA.250.2 represents a cross-manufacturer equivalent with identical electrical performance and mechanical compatibility. All substitutes carry Active product status, ROHS3 compliance, and cURus/TUV approvals.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Resistance - Initial (Ri)	Resistance - Post Trip (R1)	Operating Temperature	Packaging	Inventory
MF-R250U-2	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Tape & Reel (TR)	837 Pcs
MF-R250-2	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Cut Tape (CT)	5141 Pcs
MF-R250-2-10	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Cut Tape (CT)	4287 Pcs
MF-R250-AP	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Cut Tape (CT)	3610 Pcs
MF-R250-AP-10	Bourns Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Cut Tape (CT)	12283 Pcs
PFRA.250.2	SCHURTER Inc.	30V	2.5 A	5 A	25 mOhms	70 mOhms	-40°C ~ 85°C	Cut Tape (CT)	2518 Pcs

Engineering Selection Recommendations

All substitute parts maintain Active product status and comply with ROHS3 requirements. Bourns MF-R250 series variants (MF-R250-2, MF-R250-2-10, MF-R250-AP, MF-R250-AP-10) are direct electrical equivalents with identical performance characteristics; selection among these variants depends on packaging requirements and inventory availability. MF-R250-AP-10 offers the highest inventory level (12283 Pcs) among Bourns options. The SCHURTER PFRA.250.2 provides cross-manufacturer equivalence with identical electrical specifications and mechanical compatibility, suitable for applications requiring supplier diversification. All parts carry cURus and TUV approvals, confirming compliance with international safety standards. Selection should prioritize packaging format compatibility with assembly equipment and procurement lead time requirements.

Frequently Asked Questions (FAQ)

Q: Can MF-R250-2 (Cut Tape) be used as a direct replacement for MF-R250U-2 (Tape & Reel)?

A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format only. MF-R250U-2 arrives in Tape & Reel format suitable for automated pick-and-place assembly, while MF-R250-2 arrives in Cut Tape format. Component performance and circuit function are identical.

Q: What is the difference between MF-R250-AP and MF-R250-2?

A: Both parts are electrically and mechanically identical with all parameters matching. The suffix designations (-AP versus -2) reflect internal Bourns product line classifications but do not affect electrical performance, physical dimensions, or thermal characteristics.

Q: Is PFRA.250.2 from SCHURTER compatible with the MF-R250U-2 circuit application?

A: Yes. PFRA.250.2 matches all critical electrical parameters (30V maximum voltage, 2.5A hold current, 5A trip current, 10.3s trip time) and mechanical specifications (Through Hole, Radial Disc package, identical dimensions and lead spacing). Both parts carry cURus and TUV approvals.

Q: What inventory considerations apply when selecting a substitute?

A: MF-R250-AP-10 offers the highest Bourns inventory (12283 Pcs), followed by MF-R250-2 (5141 Pcs) and MF-R250-2-10 (4287 Pcs). PFRA.250.2 provides 2518 Pcs. Selection should account for procurement lead times and supply chain requirements.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitutes, including the main part MF-R250U-2, are ROHS3 compliant. PFRA.250.2 carries REACH Unaffected status, matching the compliance profile of Bourns equivalents.

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