Equivalent & Substitute Parts for RXE075

Part Overview

The RXE075 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 60V maximum voltage and 750 mA hold current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing circuit protection applications. The RXE075 operates across a temperature range of -40°C to 85°C and provides automatic reset functionality after fault conditions are cleared. Substitute parts must maintain electrical equivalence in voltage rating, current characteristics, and thermal performance while meeting modern compliance standards.

Key Parameters

Parameter	RXE075 Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	750 mA
Current - Trip (It)	1.5 A
Current - Max	40 A
Time to Trip	6.3 s
Resistance - Initial (Ri) (Min)	250 mOhms
Resistance - Post Trip (R1) (Max)	600 mOhms
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Type	Polymeric
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the RXE075 is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Max: Must equal or exceed 60V
Current - Hold (Ih) (Max): Must equal 750 mA
Current - Trip (It): Must equal 1.5 A
Mounting Type: Must be Through Hole
Package / Case: Must be Radial, Disc
Operating Temperature: Must span -40°C to 85°C minimum
Type: Must be Polymeric

Secondary Compatibility Parameters:

Resistance - Initial (Ri) and Resistance - Post Trip (R1) must fall within acceptable ranges for circuit protection function
Time to Trip: Must equal 6.3 s
Current - Max: Must equal or exceed 40 A

Parts are grouped into two categories based on voltage rating:

Category A - 60V Rated (Direct Voltage Equivalents): 60R075XU, MF-R075, PTR060V0075-BK, PTR060V0075-BK1, RS60RB-075, PFRA.075

Category B - Higher Voltage Rated (Backward Compatible): RXEF075, RXEF075S (72V rated), 0ZRC0075FF1E (90V rated), MF-RX075/72-AP (72V rated)

Parts in Category B can substitute for the RXE075 in applications where the circuit voltage does not exceed the substitute part's maximum rating, as higher voltage-rated devices maintain the same current and thermal characteristics while providing additional voltage margin.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih)	Current - Trip (It)	Time to Trip	Ri (Min)	R1 (Max)	Operating Temp	Product Status	RoHS Status
RXE075	Littelfuse Inc.	60V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Obsolete	RoHS non-compliant
60R075XU	Littelfuse Inc.	60V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant
RXEF075	Littelfuse Inc.	72V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant
RXEF075S	Littelfuse Inc.	72V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant
0ZRC0075FF1E	Bel Fuse Inc.	90V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant
MF-R075	Bourns Inc.	60V	750 mA	1.5 A	6.3 s	180 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant
PTR060V0075-BK	Eaton - Electronics Division	60V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	RoHS Compliant
PTR060V0075-BK1	Eaton - Electronics Division	60V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	RoHS Compliant
RS60RB-075	OptiFuse	60V	750 mA	1.5 A	6.3 s	250 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant
PFRA.075	SCHURTER Inc.	60V	750 mA	1.5 A	6.3 s	180 mOhms	600 mOhms	-40°C ~ 85°C	Active	ROHS3 Compliant
MF-RX075/72-AP	Bourns Inc.	72V	750 mA	1.5 A	6.3 s	Not specified	Not specified	-40°C ~ 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement (60V Category):

60R075XU (Littelfuse Inc.) is the preferred direct substitute. It maintains identical electrical specifications to the RXE075 while offering active product status and ROHS3 compliance. This part is manufactured by the same supplier as the original component, ensuring design continuity and supply chain reliability.

Alternative 60V Substitutes:

PTR060V0075-BK and PTR060V0075-BK1 (Eaton - Electronics Division) provide equivalent electrical performance with RoHS compliance. Both parts are actively produced and suitable for direct circuit replacement.

RS60RB-075 (OptiFuse) and PFRA.075 (SCHURTER Inc.) are electrically equivalent alternatives with ROHS3 compliance and active product status. MF-R075 (Bourns Inc.) offers equivalent performance with a lower initial resistance specification (180 mOhms minimum versus 250 mOhms), which may be advantageous in low-impedance circuit applications.

Higher Voltage Alternatives (72V and 90V Category):

RXEF075 and RXEF075S (Littelfuse Inc., 72V rated) maintain identical current and thermal characteristics while providing 12V additional voltage margin. These parts are suitable for applications where circuit voltage does not exceed 72V and offer the advantage of same-manufacturer sourcing.

0ZRC0075FF1E (Bel Fuse Inc., 90V rated) provides the highest voltage margin and includes AEC-Q200 automotive qualification. This part is suitable for applications requiring enhanced voltage headroom.

MF-RX075/72-AP (Bourns Inc., 72V rated) is a manufacturer-recommended alternative with 72V voltage rating and active product status.

Compliance Considerations:

All recommended substitutes meet modern RoHS compliance requirements. The original RXE075 is RoHS non-compliant; substitution with any recommended part improves environmental compliance posture. All substitute parts maintain CSA, TUV, or equivalent regulatory approvals.

Frequently Asked Questions (FAQ)

Q: Can I use a 72V or 90V rated PTC fuse in place of the 60V RXE075?

A: Yes, provided the actual circuit voltage does not exceed 60V. Higher voltage-rated devices maintain identical current-hold and trip characteristics. The higher voltage rating provides additional safety margin without affecting circuit protection function. However, verify that the circuit design does not require the specific voltage rating of the original part.

Q: What is the difference between the RXE075 and 60R075XU?

A: Both parts are manufactured by Littelfuse Inc. and share identical electrical specifications: 60V maximum voltage, 750 mA hold current, 1.5 A trip current, and 6.3 second trip time. The primary difference is product status: RXE075 is obsolete while 60R075XU is active production. 60R075XU also meets ROHS3 compliance, whereas RXE075 does not.

Q: Are there dimensional differences between substitute parts?

A: Minor dimensional variations exist across manufacturers. All parts maintain Through Hole Radial Disc package configuration with lead spacing between 0.197" and 0.201" (5.00mm to 5.10mm). Height-seated measurements range from 0.591" to 0.630" (15.00mm to 16.00mm). Verify PCB footprint compatibility before final selection, particularly for high-density layouts.

Q: Which substitute offers the lowest initial resistance?

A: MF-R075 (Bourns Inc.) and PFRA.075 (SCHURTER Inc.) both specify 180 mOhms minimum initial resistance, compared to 250 mOhms for most other substitutes. Lower initial resistance reduces steady-state voltage drop across the fuse element, which may be beneficial in power-sensitive applications.

Q: What is the difference between RXEF075 and RXEF075S?

A: Both parts are 72V-rated Littelfuse PolySwitch devices with identical electrical characteristics. RXEF075 is packaged in Bag format, while RXEF075S is packaged in Bulk format. Electrical performance is identical; packaging selection depends on procurement and inventory management requirements.

Q: Can I substitute based on current rating alone?

A: No. Voltage rating is equally critical. A substitute must meet or exceed the circuit's maximum voltage while maintaining the specified current-hold and trip characteristics. Using a lower voltage-rated device risks nuisance tripping; using a significantly higher voltage-rated device may compromise circuit protection sensitivity.

Q: Are all substitutes certified to the same standards as the RXE075?

A: The RXE075 carries CSA, TUV, and UL approvals. Substitute parts carry varying certifications: most include cURus and TUV; some include CQC or AEC-Q200. Verify that the selected substitute meets the specific regulatory requirements of your application and end-use market.

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