Equivalent & Substitute Parts for MF-R135-0-99

Part Overview

The MF-R135-0-99 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 1.35A hold current rating and is designed for through-hole radial mounting in disc configuration. The part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	1.35 A
Current - Trip (It)	2.7 A
Time to Trip	7.3 s
Resistance - Initial (Ri) (Min)	65 mOhms
Resistance - Post Trip (R1) (Max)	170 mOhms
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.350" Dia x 0.118" T (8.90mm x 3.00mm)
Lead Spacing	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MF-R135-0-99 is determined by strict equivalence across the following critical parameters:

Voltage rating: 30V maximum
Hold current (Ih): 1.35A maximum
Trip current (It): 2.7A
Time to trip: 7.3 seconds
Operating temperature range: -40°C to 85°C
Mounting configuration: Through hole radial disc
Physical dimensions: 0.350" diameter x 0.118" thickness (8.90mm x 3.00mm)
Lead spacing: 0.201" (5.10mm)

Substitute parts are grouped into two categories: parametric equivalents from Bourns Inc. and direct manufacturer equivalents from Littelfuse Inc. and SCHURTER Inc. All listed substitutes maintain identical electrical performance characteristics and mechanical compatibility with the original part.

Parameter Comparison

Part Number	Manufacturer	Series	Status	Voltage (Max)	Ih (Max)	It	Ri (Min)	R1 (Max)	Time to Trip	Operating Temp	Height - Seated (Max)	Lead Spacing	Approvals
MF-R135-0-99	Bourns Inc.	Multifuse® MF-R	Obsolete	30V	1.35 A	2.7 A	65 mOhms	170 mOhms	7.3 s	-40°C ~ 85°C	0.744" (18.90mm)	0.201" (5.10mm)	cURus, TUV
MF-R135	Bourns Inc.	Multifuse® MF-R	Active	30V	1.35 A	2.7 A	65 mOhms	170 mOhms	7.3 s	-40°C ~ 85°C	0.744" (18.90mm)	0.201" (5.10mm)	cURus, TUV
MF-R135-0-17	Bourns Inc.	Multifuse® MF-R	Active	30V	1.35 A	2.7 A	65 mOhms	170 mOhms	7.3 s	-40°C ~ 85°C	0.744" (18.90mm)	0.201" (5.10mm)	cUL, cURus, TUV, UL
RUEF135	Littelfuse Inc.	PolySwitch® RUEF	Active	30V	1.35 A	2.7 A	40 mOhms	130 mOhms	7.3 s	-40°C ~ 85°C	0.532" (14.60mm)	0.199" (5.05mm)	CQC, CSA, TUV, UL
PFRA.135	SCHURTER Inc.	PFRA	Active	30V	1.35 A	2.7 A	65 mOhms	170 mOhms	7.3 s	-40°C ~ 85°C	0.744" (18.90mm)	0.201" (5.10mm)	cURus, TUV

Engineering Selection Recommendations

For applications currently using the obsolete MF-R135-0-99, the following selection criteria apply:

Bourns Inc. Multifuse® MF-R Series (MF-R135 and MF-R135-0-17): These parts maintain identical electrical and mechanical specifications to the original component. MF-R135-0-17 carries expanded regulatory approvals including cUL and UL certification, making it suitable for applications requiring automotive qualification (AEC-Q200 rating). Both parts are active in production with established supply availability.

Littelfuse Inc. PolySwitch® RUEF135: This part meets all electrical performance requirements with identical voltage, hold current, trip current, and time-to-trip specifications. The RUEF135 features lower initial resistance (40 mOhms versus 65 mOhms) and lower post-trip resistance (130 mOhms versus 170 mOhms), resulting in reduced power dissipation. Physical height is reduced to 0.532" compared to 0.744" for the original part, which may require PCB layout verification. Lead spacing tolerance is 0.199" versus 0.201", representing a negligible difference. Regulatory approvals include CQC, CSA, TUV, and UL.

SCHURTER Inc. PFRA.135: This part provides electrical and mechanical equivalence with identical specifications to the Bourns MF-R135-0-99. Regulatory approvals are limited to cURus and TUV, matching the original part's certification scope.

Selection should prioritize active production status and regulatory compliance requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can MF-R135-0-99 be directly replaced with MF-R135?

A: Yes. MF-R135 is a parametric equivalent with identical electrical characteristics (30V, 1.35A hold current, 2.7A trip current, 7.3s time to trip) and mechanical dimensions. The primary difference is product status: MF-R135-0-99 is obsolete while MF-R135 is active in production. Both parts are from the Bourns Multifuse® MF-R series.

Q: What is the difference between MF-R135 and MF-R135-0-17?

A: Both parts are electrically and mechanically identical. MF-R135-0-17 carries additional regulatory approvals (cUL and UL) and includes AEC-Q200 automotive qualification rating. Selection between these parts depends on application-specific compliance requirements.

Q: Can RUEF135 be used as a substitute for MF-R135-0-99?

A: RUEF135 meets all critical electrical specifications: 30V maximum voltage, 1.35A hold current, 2.7A trip current, and 7.3 second time to trip. However, physical differences exist: RUEF135 has a reduced seated height of 0.532" compared to 0.744" for the original part, and lead spacing is 0.199" versus 0.201". PCB layout verification is required before substitution. RUEF135 offers improved performance characteristics with lower initial and post-trip resistance values.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (MF-R135, MF-R135-0-17, RUEF135, and PFRA.135) are ROHS3 compliant and REACH unaffected.

Q: What regulatory approvals should I consider when selecting a substitute?

A: The original MF-R135-0-99 carries cURus and TUV approvals. MF-R135 maintains these same approvals. MF-R135-0-17 expands approvals to include cUL and UL. RUEF135 includes CQC, CSA, TUV, and UL. PFRA.135 matches the original with cURus and TUV. Selection should align with application-specific regulatory requirements.

Q: What is the inventory status of these parts?

A: MF-R135-0-99 has 763 pieces in stock (obsolete status). Active alternatives include MF-R135 (2400 pieces), MF-R135-0-17 (980 pieces), RUEF135 (17300 pieces), and PFRA.135 (1907 pieces).

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