Equivalent & Substitute Parts for MF-R900-AP-99

Part Overview

The MF-R900-AP-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-R series. This component provides overcurrent protection at 30V with a 9A hold current rating and is designed for through-hole radial mounting applications. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing system support and procurement planning.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	9 A
Current - Trip (It)	18 A
Current - Max	40 A
Time to Trip	20 s
Resistance - Initial (Ri) (Min)	5 mOhms
Resistance - Post Trip (R1) (Max)	20 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.402" (10.20mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MF-R900-AP-99 is determined by strict equivalence across the following critical parameters:

Voltage rating: 30V maximum
Current hold rating: 9A maximum
Current trip rating: 18A
Maximum current: 40A
Time to trip: 20 seconds
Initial resistance: 5 mOhms minimum
Post-trip resistance: 20 mOhms maximum
Operating temperature range: -40°C to 85°C
Mounting configuration: Through-hole radial disc package
Lead spacing: 0.402" (10.20mm)

All identified substitute parts maintain these electrical and mechanical specifications, ensuring functional compatibility in the original application circuit.

Parameter Comparison

Parameter	MF-R900-AP-99 (Main)	MF-R900-AP	MF-R900-AP-14	30R900UMR
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Littelfuse Inc.
Product Status	Obsolete	Active	Active	Active
Voltage - Max	30V	30V	30V	30V
Current - Hold (Ih) (Max)	9 A	9 A	9 A	9 A
Current - Trip (It)	18 A	18 A	18 A	18 A
Current - Max	40 A	40 A	40 A	40 A
Time to Trip	20 s	20 s	20 s	20 s
Resistance - Initial (Ri) (Min)	5 mOhms	5 mOhms	5 mOhms	5 mOhms
Resistance - Post Trip (R1) (Max)	20 mOhms	20 mOhms	20 mOhms	20 mOhms
Operating Temperature	-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
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Lead Spacing	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)	0.402" (10.20mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	-	Tape & Box (TB)	Tape & Box (TB)	Cut Tape (CT)

Engineering Selection Recommendations

MF-R900-AP and MF-R900-AP-14 are both active Bourns Inc. products within the same Multifuse® MF-R series. MF-R900-AP-14 carries additional automotive-grade certification (AEC-Q200) and expanded approval agency listings (cUL, cURus, TUV, UL), making it suitable for applications requiring higher qualification standards. Both are available in Tape & Box packaging.

The 30R900UMR from Littelfuse Inc. is a cross-manufacturer equivalent from the POLY-FUSE® 30R series. It maintains all critical electrical parameters and is actively produced with higher inventory availability. Physical dimensions show minor variations within acceptable tolerances (height-seated: 1.244" vs. 1.295" for Bourns parts). This part is supplied in Cut Tape packaging.

All three substitute parts are ROHS3 compliant and carry cURus and TUV approvals, meeting standard industrial compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can MF-R900-AP directly replace MF-R900-AP-99 in existing designs?

A: Yes. MF-R900-AP maintains identical electrical specifications and mechanical form factor. The primary difference is product status (active vs. obsolete) and packaging format (Tape & Box vs. standard packaging).

Q: What is the difference between MF-R900-AP and MF-R900-AP-14?

A: Both parts are electrically and mechanically equivalent. MF-R900-AP-14 includes AEC-Q200 automotive qualification and expanded approval agency certifications (cUL, cURus, TUV, UL vs. cURus, TUV). Select MF-R900-AP-14 for applications requiring automotive-grade components.

Q: Is the Littelfuse 30R900UMR a suitable cross-manufacturer substitute?

A: Yes. The 30R900UMR meets all critical electrical parameters and mechanical mounting requirements. Minor physical dimension variations (height-seated: 1.244" vs. 1.295") fall within acceptable tolerances for through-hole radial disc packages. Verify PCB layout clearances if space constraints exist.

Q: What packaging options are available?

A: MF-R900-AP and MF-R900-AP-14 are supplied in Tape & Box (TB) format. The 30R900UMR is supplied in Cut Tape (CT) format. Select based on procurement and assembly requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed parts are ROHS3 compliant and REACH unaffected, meeting current environmental regulations.

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