Equivalent & Substitute Parts for 30R250UPR

Part Overview

The 30R250UPR is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the POLY-FUSE® 30R series. This component provides overcurrent protection with a 30V maximum voltage rating and 2.5A hold current specification. The part is active in production with full RoHS3 compliance and cURus/TUV approval. Substitute parts are identified to address packaging availability, lead spacing variations, and alternative sourcing requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Specification
Voltage - Max	30V
Current - Hold (Ih) (Max)	2.5 A
Current - Trip (It)	5 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)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters: maximum voltage rating (30V), hold current (2.5A), trip current (5A), trip time (10.3s), post-trip resistance maximum (70 mOhms), mounting type (Through Hole), and package form (Radial, Disc). All identified substitutes meet these core electrical specifications. Variations in lead spacing, initial resistance minimum, current maximum rating, and packaging format (Cut Tape, Bag, Bulk) do not affect functional substitutability in circuit applications but may impact assembly and inventory handling.

Parameter Comparison

Parameter	30R250UPR (Littelfuse)	RUEF250 (Littelfuse)	PTR030V0250-TR (Eaton)	MF-R250 (Bourns)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division	Bourns Inc.
Series	POLY-FUSE® 30R	PolySwitch® RUEF	PTR030V	Multifuse® MF-R
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
Time to Trip	10.3 s	10.3 s	10.3 s	10.3 s
Resistance - Initial (Ri) (Min)	20 mOhms	20 mOhms	20 mOhms	25 mOhms
Resistance - Post Trip (R1) (Max)	70 mOhms	70 mOhms	70 mOhms	70 mOhms
Operating Temperature	-40°C ~ 85°C	Not specified	-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	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)
Height - Seated (Max)	0.720" (18.30mm)	0.720" (18.30mm)	0.720" (18.30mm)	0.720" (18.30mm)
Lead Spacing	0.118" (3.00mm)	0.199" (5.05mm)	0.197" (5.00mm)	0.201" (5.10mm)
Packaging	Cut Tape (CT)	Bag	Cut Tape (CT)	Bulk
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	CQC, CSA, TUV, UL	cURus, TUV	cURus, TUV

Engineering Selection Recommendations

All substitute parts maintain active product status and full RoHS3 compliance. The 30R250UPR, PTR030V0250-TR, and MF-R250 share identical operating temperature ranges (-40°C to 85°C) and are approved by cURus and TUV. The RUEF250 carries expanded regulatory approval (CQC, CSA, TUV, UL) and is available in higher inventory quantity (5274 pcs), making it suitable for applications requiring broader certification coverage. Lead spacing differences (0.118" for 30R250UPR versus 0.197–0.201" for other substitutes) must be evaluated against PCB layout constraints. The MF-R250 exhibits a slightly higher initial resistance minimum (25 mOhms versus 20 mOhms) but remains within acceptable performance parameters for equivalent circuit protection.

Frequently Asked Questions (FAQ)

Q: Can RUEF250 be used as a direct replacement for 30R250UPR in all applications?

A: RUEF250 is electrically equivalent with identical voltage, hold current, trip current, and trip time specifications. The primary difference is lead spacing (0.199" versus 0.118"), which requires PCB layout verification. Both parts are ROHS3 compliant and TUV approved.

Q: What is the significance of lead spacing variation among these substitutes?

A: Lead spacing affects PCB hole positioning and assembly compatibility. The 30R250UPR uses 0.118" spacing, while RUEF250, PTR030V0250-TR, and MF-R250 use 0.197–0.201" spacing. PCB design must accommodate the selected part's lead spacing to ensure proper mounting.

Q: Are there differences in initial resistance that affect circuit performance?

A: MF-R250 specifies a minimum initial resistance of 25 mOhms compared to 20 mOhms for other parts. This 5 mOhm difference is within typical circuit tolerance margins and does not affect functional substitutability for standard overcurrent protection applications.

Q: Which substitute offers the broadest regulatory approval?

A: RUEF250 carries approval from CQC, CSA, TUV, and UL, providing the widest regulatory coverage. Other substitutes are approved by cURus and TUV. Selection should align with specific application certification requirements.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape (CT), Bag, and Bulk packaging formats are logistics and inventory considerations only. All parts deliver identical electrical and mechanical performance regardless of packaging type.

Q: What is the maximum current rating difference between 30R250UPR and RUEF250?

A: 30R250UPR is rated for 40A maximum current, while RUEF250 is rated for 100A maximum. Both maintain the same 2.5A hold current and 5A trip current. The higher maximum rating in RUEF250 does not affect substitutability for applications designed around the 2.5A hold specification.

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