Equivalent & Substitute Parts for RLD60P075XFF

Part Overview

The RLD60P075XFF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 60V maximum voltage with 750 mA hold current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The RLD60 series POLY-FUSE® device provides circuit protection through automatic current limiting and thermal reset capability in a through-hole radial disc package.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	750 mA
Current - Trip (It)	1.5 A
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
Lead Spacing	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the RLD60P075XFF is determined by the following critical parameters:

Voltage Rating: Maximum voltage must equal or exceed 60V
Current - Hold (Ih): Must be 750 mA or higher to maintain equivalent protection threshold
Current - Trip (It): Must be 1.5 A or higher for consistent fault response
Mounting Type: Through hole radial configuration required for PCB compatibility
Lead Spacing: 0.201" (5.10mm) spacing for footprint compatibility
Operating Temperature Range: -40°C to 85°C minimum
Regulatory Compliance: ROHS3 compliance and recognized approval agencies (cURus, TUV, UL, CSA)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (60V, 750 mA): Parts with identical voltage and hold current ratings, differing only in series designation or packaging format.

Category B - Voltage-Elevated Equivalents (72V, 750 mA): Parts with higher voltage ratings suitable for 60V applications, maintaining identical hold current and trip characteristics.

Category C - Current-Reduced Equivalents (60V, 650 mA): Parts with lower hold current ratings from alternative manufacturers, acceptable only where circuit design permits reduced protection threshold.

Parameter Comparison

Part Number	Manufacturer	Voltage - Max	Current - Hold (Ih) (Max)	Current - Trip (It)	Resistance - Initial (Ri) (Min)	Resistance - Post Trip (R1) (Max)	Product Status	Lead Spacing
RLD60P075XFF	Littelfuse Inc.	60V	750 mA	1.5 A	250 mOhms	600 mOhms	Obsolete	0.201" (5.10mm)
60R075XPR	Littelfuse Inc.	60V	750 mA	1.5 A	250 mOhms	600 mOhms	Active	0.201" (5.10mm)
72R075XPR	Littelfuse Inc.	72V	750 mA	1.5 A	250 mOhms	600 mOhms	Active	0.201" (5.10mm)
RXEF075-AP	Littelfuse	72V	750 mA	1.5 A	250 mOhms	600 mOhms	Active	0.199" (5.05mm)
PFRA.075	SCHURTER Inc.	60V	750 mA	1.5 A	180 mOhms	600 mOhms	Active	0.201" (5.10mm)
PFRA.075.2	SCHURTER Inc.	60V	750 mA	1.5 A	180 mOhms	600 mOhms	Active	0.201" (5.10mm)
PFRA.065	SCHURTER Inc.	60V	650 mA	1.3 A	270 mOhms	720 mOhms	Active	0.201" (5.10mm)
PFRA.065.2	SCHURTER Inc.	60V	650 mA	1.3 A	270 mOhms	720 mOhms	Active	0.201" (5.10mm)

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents)

The 60R075XPR from Littelfuse Inc. is the recommended primary substitute. This part maintains identical electrical specifications (60V, 750 mA hold current, 1.5 A trip current) with matching lead spacing and package configuration. The 60R075XPR is active in production status with ROHS3 compliance and cURus/TUV approvals, ensuring long-term availability and regulatory alignment.

Secondary Substitutes (Voltage-Elevated)

The 72R075XPR and RXEF075-AP are suitable alternatives where circuit design permits higher voltage ratings. Both maintain the 750 mA hold current and 1.5 A trip current specifications. The 72R075XPR (Littelfuse 72R series) and RXEF075-AP (PolySwitch RXEF series) are active products with full regulatory approvals. The RXEF075-AP includes expanded certification (CQC, CSA, TUV, UL) and is suitable for applications requiring broader international compliance.

Cross-Manufacturer Alternatives (SCHURTER PFRA Series)

The PFRA.075 and PFRA.075.2 from SCHURTER Inc. provide electrical equivalence at 60V and 750 mA hold current with identical lead spacing. These parts feature lower initial resistance (180 mOhms vs. 250 mOhms) and are active products with ROHS3 compliance. PFRA.075.2 is supplied in cut tape packaging, while PFRA.075 is supplied in bulk.

Limited Substitutes (Current-Reduced)

The PFRA.065 and PFRA.065.2 are acceptable only where circuit design analysis confirms that 650 mA hold current and 1.3 A trip current provide adequate protection. These parts operate at reduced current thresholds compared to the original specification and should be selected only when design margins permit.

Frequently Asked Questions (FAQ)

Q: Can I use 72R075XPR or RXEF075-AP in place of RLD60P075XFF?

A: Yes. Both parts maintain the 750 mA hold current and 1.5 A trip current specifications required for equivalent protection. The higher voltage rating (72V) is suitable for 60V applications. Lead spacing is compatible (0.201" or 0.199", both within tolerance). Verify that your circuit design does not depend on the specific 60V maximum rating.

Q: What is the difference between PFRA.075 and PFRA.075.2?

A: Both parts are electrically identical with 60V rating and 750 mA hold current. The primary difference is packaging: PFRA.075 is supplied in bulk, while PFRA.075.2 is supplied in cut tape (CT). Select based on your procurement and assembly requirements.

Q: Can I use PFRA.065 or PFRA.065.2 as substitutes?

A: These parts have reduced hold current (650 mA vs. 750 mA) and trip current (1.3 A vs. 1.5 A). They are acceptable only if your circuit design analysis confirms that the lower protection threshold is acceptable. Do not use as direct substitutes without circuit validation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original RLD60P075XFF specification.

Q: What approval agencies certify these parts?

A: Littelfuse parts (60R075XPR, 72R075XPR, RXEF075-AP) carry cURus and TUV approvals. RXEF075-AP additionally includes CQC, CSA, and UL certifications. SCHURTER PFRA series parts carry cURus and TUV approvals. All meet recognized international safety standards.

Q: Is lead spacing critical for substitution?

A: Yes. The original RLD60P075XFF specifies 0.201" (5.10mm) lead spacing. All recommended substitutes maintain this spacing or are within 0.002" tolerance (RXEF075-AP at 0.199"). Verify PCB footprint compatibility before selection.

Q: Why is RLD60P075XFF obsolete?

A: The RLD60P075XFF is classified as obsolete by Littelfuse Inc. The active equivalent 60R075XPR from the same manufacturer provides identical specifications and is recommended for new designs and ongoing procurement.

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