MF-R800-0-99 Equivalent & Substitute Parts

Part Overview

The MF-R800-0-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 30V at 8A hold current with through-hole radial disc packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Active alternatives from Bourns and cross-manufacturer sources provide identical electrical and mechanical performance while maintaining current product status and supply availability.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	8 A
Current - Trip (It)	16 A
Current - Max	40 A
Time to Trip	18.8 s
Resistance - Initial (Ri) (Min)	5 mOhms
Resistance - Post Trip (R1) (Max)	30 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.953" L x 0.118" W (24.20mm x 3.00mm)
Height - Seated (Max)	1.295" (32.90mm)
Lead Spacing	0.402" (10.20mm)
Type	Polymeric
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MF-R800-0-99 is determined by strict equivalence across the following critical parameters:

Voltage rating: 30V maximum
Current hold (Ih): 8A maximum
Current trip (It): 16A
Current maximum: 40A
Time to trip: 18.8 seconds
Initial resistance (Ri): 5 mOhms minimum
Post-trip resistance (R1): 30 mOhms maximum
Operating temperature range: -40°C to 85°C
Mounting type: Through hole
Package type: Radial disc
Physical dimensions: 0.953" L x 0.118" W with 0.402" lead spacing
Compliance: ROHS3 compliant

All substitute parts listed below meet these parameters identically. Substitutes are grouped by manufacturer and product status to facilitate procurement decisions.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Resistance - Initial (Ri)	Resistance - Post Trip (R1)	Operating Temperature	Approval Agency	Inventory (Pcs)
MF-R800-0-99	Bourns Inc.	Obsolete	30V	8 A	16 A	5 mOhms	30 mOhms	-40°C ~ 85°C	cURus, TUV	889
MF-R800	Bourns Inc.	Active	30V	8 A	16 A	5 mOhms	30 mOhms	-40°C ~ 85°C	cURus, TUV	3785
MF-R800-0-003	Bourns Inc.	Active	30V	8 A	16 A	5 mOhms	30 mOhms	-40°C ~ 85°C	cURus, TUV	941
MF-R800-0-14	Bourns Inc.	Active	30V	8 A	16 A	5 mOhms	30 mOhms	-40°C ~ 85°C	cUL, cURus, TUV, UL	773
MF-R800-005	Bourns Inc.	Active	30V	8 A	16 A	5 mOhms	30 mOhms	-40°C ~ 85°C	cURus, TUV	844
PFRA.800	SCHURTER Inc.	Active	30V	8 A	16 A	5 mOhms	30 mOhms	-40°C ~ 85°C	cURus, TUV	715

Engineering Selection Recommendations

For applications currently using MF-R800-0-99, the following selection criteria apply:

Bourns Inc. Active Alternatives: MF-R800, MF-R800-0-003, MF-R800-0-14, and MF-R800-005 are all active products from the original manufacturer with identical electrical and mechanical specifications. These parts maintain full compliance with ROHS3 and carry cURus and TUV certifications. MF-R800-0-14 provides additional certification coverage with cUL and UL approvals, suitable for applications requiring expanded regulatory compliance.

Cross-Manufacturer Alternative: PFRA.800 from SCHURTER Inc. is a direct functional equivalent with identical electrical parameters, physical dimensions, and certifications. This option provides supply diversification and maintains ROHS3 compliance.

Product Status Consideration: All substitute parts listed are active products with current manufacturing support, eliminating the supply risk associated with the obsolete MF-R800-0-99.

Frequently Asked Questions (FAQ)

Q: Can MF-R800-0-99 be directly replaced with MF-R800? A: Yes. MF-R800 is a direct parametric equivalent with identical voltage, current, resistance, and temperature specifications. The primary difference is product status: MF-R800 is active while MF-R800-0-99 is obsolete. Both share the same base product number and electrical characteristics.

Q: What is the difference between MF-R800-0-14 and other Bourns alternatives? A: MF-R800-0-14 carries additional regulatory approvals (cUL and UL) beyond the standard cURus and TUV certifications. All other electrical and mechanical parameters are identical. Select this variant if your application requires UL or cUL certification.

Q: Is PFRA.800 from SCHURTER a suitable replacement? A: Yes. PFRA.800 meets all electrical and mechanical parameters identically to MF-R800-0-99, including voltage, current ratings, resistance values, temperature range, and physical dimensions. It carries equivalent certifications (cURus, TUV) and is ROHS3 compliant.

Q: Are there packaging differences between these substitutes? A: All substitute parts use identical through-hole radial disc packaging with the same physical dimensions (0.953" L x 0.118" W, 24.20mm x 3.00mm) and lead spacing (0.402" / 10.20mm). Packaging format variations (Bulk vs. standard) do not affect electrical or mechanical compatibility.

Q: Which substitute offers the best supply availability? A: MF-R800 from Bourns Inc. currently has the highest inventory level at 3785 pieces, followed by MF-R800-005 at 844 pieces and MF-R800-0-14 at 773 pieces. PFRA.800 from SCHURTER provides cross-manufacturer supply at 715 pieces.

Q: Do all substitutes maintain the same thermal and electrical performance? A: Yes. All listed substitutes maintain identical operating temperature range (-40°C to 85°C), time-to-trip specification (18.8 seconds), and resistance characteristics (5 mOhms initial, 30 mOhms post-trip maximum). Electrical performance is fully equivalent across all alternatives.

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