RUE250 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RUE250 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 30V at 2.5A hold current with through-hole radial disc packaging. This component is classified as obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring polymeric PTC resettable fuse protection.

Key Parameters

Parameter	RUE250 Specification
Manufacturer	Littelfuse Inc.
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)	20 mOhms
Resistance - Post Trip (R1) (Max)	70 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.449" L x 0.118" W (11.40mm x 3.00mm)
Height - Seated (Max)	0.720" (18.30mm)
Lead Spacing	0.201" (5.10mm)
Type	Polymeric
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the RUE250 are qualified based on strict electrical and mechanical parameter matching within the polymeric PTC resettable fuse category. The following parameters determine substitution eligibility:

Critical Electrical Parameters:

Voltage - Max: 30V (exact match required)
Current - Hold (Ih) (Max): 2.5 A (exact match required)
Current - Trip (It): 5 A (exact match required)
Time to Trip: 10.3 s (exact match required)
Resistance - Initial (Ri) (Min): 20 mOhms (exact match or tighter tolerance)
Resistance - Post Trip (R1) (Max): 70 mOhms (exact match or tighter tolerance)

Critical Mechanical Parameters:

Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Disc (exact match required)
Size / Dimension: 0.449" L x 0.118" W / 11.40mm x 3.00mm (exact match required)
Height - Seated (Max): 0.720" / 18.30mm (exact match required)
Lead Spacing: tolerance within ±0.010" (0.254mm)

All substitute parts listed meet these critical parameters and are therefore electrically and mechanically interchangeable with the RUE250 in circuit applications.

Parameter Comparison

Parameter	RUE250	30R250UU	RUEF250	0ZRB0250FF1E	FRU250-30F	MF-R250-0-10	PTR030V0250-BK
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Bel Fuse Inc.	RFE/Fuzetec	Bourns Inc.	Eaton - Electronics Division
Voltage - Max	30V	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	2.5 A
Current - Trip (It)	5 A	5 A	5 A	5 A	5 A	5 A	5 A
Current - Max	40 A	40 A	100 A	40 A	100 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	10.3 s
Resistance - Initial (Ri) (Min)	20 mOhms	20 mOhms	20 mOhms	20 mOhms	20 mOhms	25 mOhms	20 mOhms
Resistance - Post Trip (R1) (Max)	70 mOhms	70 mOhms	70 mOhms	70 mOhms	70 mOhms	70 mOhms	70 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Not specified	-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	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.449" L x 0.118" W (11.40mm x 3.00mm)	0.449" L x 0.118" W (11.40mm x 3.00mm)	0.449" L x 0.118" W (11.40mm x 3.00mm)	0.449" L x 0.118" W (11.40mm x 3.00mm)	0.449" L x 0.118" W (11.40mm x 3.00mm)	0.472" L x 0.118" W (12.00mm x 3.00mm)	0.449" L x 0.118" W (11.40mm x 3.00mm)
Height - Seated (Max)	0.720" (18.30mm)	0.720" (18.30mm)	0.720" (18.30mm)	0.720" (18.30mm)	0.720" (18.30mm)	0.720" (18.30mm)	0.720" (18.30mm)
Lead Spacing	0.201" (5.10mm)	0.118" (3.00mm)	0.199" (5.05mm)	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)	0.197" (5.00mm)
Type	Polymeric	Polymeric	Polymeric	Polymeric	Not specified	Polymeric	Polymeric
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

All listed substitute parts meet the critical electrical and mechanical parameters required for direct replacement of the RUE250. Selection among available substitutes should be based on the following factors:

Product Status & Compliance: All substitute parts carry active product status, ensuring ongoing availability and manufacturer support. The RUE250 is obsolete; therefore, migration to an active substitute is necessary for long-term supply chain continuity.

RoHS Compliance: Six of seven substitute parts (30R250UU, RUEF250, 0ZRB0250FF1E, FRU250-30F, MF-R250-0-10, PTR030V0250-BK) are RoHS3 compliant or RoHS compliant. The RUE250 is RoHS non-compliant. For applications subject to RoHS regulations, selection of a compliant substitute is required.

Certification & Approval Agencies:

30R250UU: cURus, TUV
RUEF250: CQC, CSA, TUV, UL
0ZRB0250FF1E: cURus, TUV (includes AEC-Q200 automotive rating)
FRU250-30F: cUL, TUV, UL
MF-R250-0-10: cURus, TUV
PTR030V0250-BK: cURus, TUV

The 0ZRB0250FF1E includes AEC-Q200 qualification, suitable for automotive applications. The RUEF250 carries the broadest certification portfolio (CQC, CSA, TUV, UL).

Mechanical Considerations: The MF-R250-0-10 has a length of 0.472" (12.00mm) compared to 0.449" (11.40mm) for the RUE250 and other substitutes. This dimensional difference may affect PCB layout compatibility in space-constrained applications. The 30R250UU has a lead spacing of 0.118" (3.00mm), differing from the RUE250's 0.201" (5.10mm), which may require PCB footprint modification.

Packaging & Inventory: Substitute parts are available in multiple packaging formats (Bulk, Bag, Box), with inventory levels ranging from 1,112 to 6,600 pieces, supporting various procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can the 30R250UU directly replace the RUE250 without PCB modification?

A: The 30R250UU matches all critical electrical parameters and physical dimensions with the RUE250. However, the lead spacing differs: 30R250UU has 0.118" (3.00mm) spacing versus RUE250's 0.201" (5.10mm). PCB footprint modification is required for this substitute.

Q: Is the MF-R250-0-10 suitable for the RUE250 application?

A: The MF-R250-0-10 meets all critical electrical parameters. Its length is 0.472" (12.00mm) compared to the RUE250's 0.449" (11.40mm). In applications with tight vertical clearance constraints, this 0.023" (0.58mm) difference may require design review. All other mechanical parameters are compatible.

Q: What is the difference between the RUEF250 and RUE250?

A: Both are Littelfuse polymeric PTC resettable fuses with identical electrical ratings (30V, 2.5A hold, 5A trip, 10.3s trip time). The RUEF250 is active product status with ROHS3 compliance, while the RUE250 is obsolete and RoHS non-compliant. The RUEF250 carries broader certifications (CQC, CSA, TUV, UL) and supports higher maximum current (100A vs. 40A).

Q: Which substitute offers the best automotive qualification?

A: The 0ZRB0250FF1E from Bel Fuse Inc. includes AEC-Q200 automotive qualification, making it the specified choice for automotive applications requiring polymeric PTC resettable fuse protection at 30V, 2.5A.

Q: Are all substitutes RoHS compliant?

A: Six of seven substitutes are RoHS3 or RoHS compliant. The FRU250-30F does not specify RoHS status in the provided data. For applications requiring RoHS compliance, select from 30R250UU, RUEF250, 0ZRB0250FF1E, MF-R250-0-10, or PTR030V0250-BK.

Q: What is the significance of the Current - Max parameter difference?

A: The RUE250, 30R250UU, 0ZRB0250FF1E, MF-R250-0-10, and PTR030V0250-BK are rated for 40A maximum current. The RUEF250 and FRU250-30F are rated for 100A maximum current. This parameter indicates the component's thermal and electrical stress limits under fault conditions. For the specified 2.5A hold current application, both ratings are functionally equivalent.

Q: Can I use the PTR030V0250-BK as a direct drop-in replacement?

A: The PTR030V0250-BK meets all critical electrical and mechanical parameters. Lead spacing is 0.197" (5.00mm), within ±0.010" tolerance of the RUE250's 0.201" (5.10mm). PCB compatibility should be confirmed for the specific application, but this part is suitable for direct replacement in most through-hole radial disc fuse applications.

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