Equivalent & Substitute Parts for MF-RX135

Part Overview

The MF-RX135 is a polymeric PTC resettable fuse manufactured by Bourns Inc. in the Multifuse® MF-RX series. This component is rated for 60V maximum voltage with a 1.35A hold current and is designed for through-hole radial mounting. The MF-RX135 has reached obsolete product status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	1.35 A
Current - Trip (It)	2.7 A
Current - Max	40 A
Time to Trip	9.6 s
Resistance - Initial (Ri) (Min)	120 mOhms
Resistance - Post Trip (R1) (Max)	300 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Lead Spacing	0.201" (5.10mm)
Type	Polymeric
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MF-RX135 is determined by the following critical parameters:

Voltage - Max: 60V (minimum requirement; higher voltage ratings are acceptable)
Current - Hold (Ih) (Max): 1.35 A (must match exactly)
Current - Trip (It): 2.7 A (must match exactly)
Resistance - Initial (Ri) (Min): 120 mOhms (must match exactly)
Resistance - Post Trip (R1) (Max): 300 mOhms (must match exactly)
Operating Temperature: -40°C ~ 85°C (must match or exceed)
Mounting Type: Through Hole (must match)
Package / Case: Radial, Disc (must match)
Lead Spacing: 0.201" (5.10mm) (must match exactly)
Type: Polymeric (must match)

Substitute parts are classified into two categories:

Parametric Equivalents: Parts manufactured by Bourns Inc. that maintain identical electrical and mechanical specifications to the MF-RX135, with active product status.

Direct Substitutes: Parts from alternative manufacturers (Littelfuse Inc., Eaton - Electronics Division, Bel Fuse Inc.) that meet all critical electrical parameters and mechanical compatibility requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Resistance - Initial (Ri)	Resistance - Post Trip (R1)	Operating Temperature	Lead Spacing	Product Status	Inventory
MF-RX135	Bourns Inc.	60V	1.35 A	2.7 A	120 mOhms	300 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	Obsolete	2200 Pcs
MF-RX135-0-H2	Bourns Inc.	60V	1.35 A	2.7 A	120 mOhms	300 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	Active	982 Pcs
MF-RX135-005	Bourns Inc.	60V	1.35 A	2.7 A	120 mOhms	300 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	Active	754 Pcs
MF-RX135/72-0	Bourns Inc.	72V	1.35 A	2.7 A	120 mOhms	300 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	Active	21965 Pcs
60R135XF	Littelfuse Inc.	60V	1.35 A	2.7 A	120 mOhms	300 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	Active	806 Pcs
60R135XMR	Littelfuse Inc.	60V	1.35 A	2.7 A	120 mOhms	300 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	Active	2181 Pcs
PTR060V0135-TR	Eaton - Electronics Division	60V	1.35 A	2.7 A	120 mOhms	300 mOhms	-40°C ~ 85°C	0.197" (5.00mm)	Active	878 Pcs
0ZRC0135FF1A	Bel Fuse Inc.	90V	1.35 A	2.7 A	120 mOhms	300 mOhms	-40°C ~ 85°C	0.201" (5.10mm)	Active	2046 Pcs

Engineering Selection Recommendations

Primary Parametric Equivalents (Bourns Inc.):

MF-RX135-0-H2 and MF-RX135-005 are direct parametric equivalents with active product status. Both maintain identical electrical specifications and mechanical form factor to the obsolete MF-RX135. These parts are recommended as the first choice for direct replacement in existing designs. Both are ROHS3 compliant and carry cURus and TUV approvals.

Secondary Parametric Equivalent (Bourns Inc.):

MF-RX135/72-0 is a parametric equivalent with elevated voltage rating (72V vs. 60V). This part is suitable for applications where the original 60V specification can accommodate higher voltage margin. This variant offers the highest inventory availability (21965 Pcs) and is packaged in bulk format.

Direct Substitutes (Alternative Manufacturers):

60R135XF and 60R135XMR (Littelfuse Inc., POLY-FUSE® series) meet all critical electrical and mechanical parameters. Both are active products with ROHS3 compliance and cURus/TUV approvals. 60R135XMR is supplied in Cut Tape format with higher inventory (2181 Pcs).

PTR060V0135-TR (Eaton - Electronics Division) meets all electrical specifications with a minor lead spacing variation (0.197" vs. 0.201"). This part is supplied in Tape & Reel format and carries ROHS3 compliance and cURus/TUV approvals.

0ZRC0135FF1A (Bel Fuse Inc., 0ZRC series) provides elevated voltage rating (90V) with identical electrical characteristics. This part includes AEC-Q200 automotive qualification and is suitable for applications requiring higher voltage margin.

Frequently Asked Questions (FAQ)

Q: Can MF-RX135-0-H2 be used as a direct replacement for the obsolete MF-RX135?

A: Yes. MF-RX135-0-H2 is a parametric equivalent with identical voltage, current, resistance, and temperature specifications. Both are through-hole radial disc packages with 0.201" lead spacing. The primary difference is product status: MF-RX135-0-H2 is active.

Q: What is the difference between MF-RX135-005 and MF-RX135-0-H2?

A: Both are parametric equivalents with identical electrical and mechanical specifications. The difference is in packaging designation and inventory availability. MF-RX135-005 has 754 Pcs in stock; MF-RX135-0-H2 has 982 Pcs.

Q: Can MF-RX135/72-0 be used in place of MF-RX135?

A: Yes, with design consideration. MF-RX135/72-0 has a higher maximum voltage rating (72V vs. 60V) while maintaining identical current, resistance, and temperature specifications. This part is suitable for applications where increased voltage margin is acceptable or beneficial.

Q: What are the key differences between Bourns and Littelfuse substitutes?

A: Littelfuse 60R135XF and 60R135XMR maintain identical electrical specifications and lead spacing (0.201"). The primary differences are manufacturer series designation (POLY-FUSE® vs. Multifuse®), physical dimensions (0.535" Dia vs. 0.483" L), and packaging format (Bulk or Cut Tape vs. standard packaging).

Q: Is PTR060V0135-TR compatible with the MF-RX135?

A: PTR060V0135-TR meets all critical electrical parameters. However, the lead spacing is 0.197" (5.00mm) compared to the MF-RX135 specification of 0.201" (5.10mm). This 0.004" difference may require PCB layout verification for through-hole mounting compatibility.

Q: Can 0ZRC0135FF1A be used in a 60V application?

A: Yes. 0ZRC0135FF1A is rated for 90V maximum voltage, which exceeds the 60V requirement. All electrical parameters (current, resistance, temperature) are identical to the MF-RX135. This part is suitable for applications where higher voltage rating provides additional design margin.

Q: What packaging formats are available for these substitutes?

A: MF-RX135-0-H2 and MF-RX135-005 are available in standard packaging. MF-RX135/72-0 is supplied in Bulk format. Littelfuse 60R135XF is Bulk; 60R135XMR is Cut Tape. PTR060V0135-TR is Tape & Reel. 0ZRC0135FF1A is supplied in Box format.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status. All parts also hold cURus and TUV approvals, with the exception of 0ZRC0135FF1A, which includes AEC-Q200 automotive qualification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message