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RLD60P040XFF Equivalent & Substitute Parts
Part Overview
The RLD60P040XFF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 60V maximum voltage with 400 mA hold current. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement.
Polymeric PTC resettable fuses function as automatic circuit protection devices that increase in resistance when exposed to overcurrent conditions, then return to normal resistance when the fault is cleared. The RLD60P040XFF is designed for through-hole radial mounting in disc form factor applications requiring 60V protection at 400 mA hold current levels.
Substiute Parts
Key Parameters
| Parameter | RLD60P040XFF |
|---|---|
| Voltage - Max | 60V |
| Current - Hold (Ih) (Max) | 400 mA |
| Current - Trip (It) | 800 mA |
| Resistance - Initial (Ri) (Min) | 550 mOhms |
| Resistance - Post Trip (R1) (Max) | 1.29 Ohms |
| Time to Trip | 3.8 s |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Through Hole |
| Package / Case | Radial, Disc |
| Size / Dimension | 0.299" Dia x 0.122" T (7.60mm x 3.10mm) |
| Lead Spacing | 0.201" (5.10mm) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the RLD60P040XFF is determined by the following critical parameters:
Voltage Rating: The maximum voltage must equal or exceed 60V to maintain circuit protection integrity.
Current - Hold (Ih): The hold current must be 400 mA to ensure the fuse remains in normal state during intended circuit operation.
Current - Trip (It): The trip current must be 800 mA to provide consistent overcurrent response.
Mounting Type & Form Factor: Through-hole radial disc mounting is required for mechanical and electrical compatibility.
Resistance Characteristics: Initial resistance (Ri) and post-trip resistance (R1) must remain within specified ranges to preserve circuit behavior and fault protection response.
Substitute parts are grouped into two categories:
Parametric Equivalents: Parts with identical electrical specifications (60V, 400 mA Ih, 800 mA It) from Littelfuse, available in active product status with improved packaging options.
Manufacturer Recommended Alternatives: Parts from SCHURTER Inc. (PFRA series) that share the same voltage rating and mounting form factor but with different current ratings. These are listed in the original part's substitute field and represent approved alternatives for applications where current requirements differ.
Parameter Comparison
| Parameter | RLD60P040XFF | 60R040XPR | 72R040XPR | RXEF040-AP |
|---|---|---|---|---|
| Manufacturer | Littelfuse Inc. | Littelfuse Inc. | Littelfuse Inc. | Littelfuse Inc. |
| Voltage - Max | 60V | 60V | 72V | 72V |
| Current - Hold (Ih) (Max) | 400 mA | 400 mA | 400 mA | 400 mA |
| Current - Trip (It) | 800 mA | 800 mA | 800 mA | 800 mA |
| Resistance - Initial (Ri) (Min) | 550 mOhms | 550 mOhms | 550 mOhms | 550 mOhms |
| Resistance - Post Trip (R1) (Max) | 1.29 Ohms | 1.29 Ohms | 1.29 Ohms | 1.29 Ohms |
| Time to Trip | 3.8 s | 3.8 s | 3.8 s | 3.8 s |
| 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 |
| Size / Dimension | 0.299" Dia x 0.122" T (7.60mm x 3.10mm) | 0.299" Dia x 0.122" T (7.60mm x 3.10mm) | 0.299" Dia x 0.122" T (7.60mm x 3.10mm) | 0.299" Dia x 0.118" T (7.60mm x 3.00mm) |
| Lead Spacing | 0.201" (5.10mm) | 0.201" (5.10mm) | 0.201" (5.10mm) | 0.199" (5.05mm) |
| Product Status | Obsolete | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Approval Agency | cURus, TUV | cURus, TUV | cURus, TUV | CQC, CSA, TUV, UL |
Engineering Selection Recommendations
Primary Equivalent: The 60R040XPR is the direct parametric equivalent to the RLD60P040XFF. It maintains identical electrical specifications (60V, 400 mA Ih, 800 mA It) and mechanical form factor. The 60R040XPR is in active product status and carries the same regulatory approvals (cURus, TUV). This part is the preferred replacement for direct substitution in existing designs.
Voltage-Rated Alternative: The 72R040XPR provides identical electrical performance with an elevated maximum voltage rating of 72V. This part is suitable for applications where circuit voltage may exceed 60V but remain below 72V. The 72R040XPR is active and maintains all required certifications.
Cross-Manufacturer Option: The RXEF040-AP from Littelfuse's PolySwitch series offers 72V rating with 400 mA hold current. This part features expanded regulatory approvals (CQC, CSA, TUV, UL) and is available in cut tape packaging. Minor dimensional variations exist in thickness (0.118" vs. 0.122") and lead spacing (0.199" vs. 0.201"), which may require PCB layout verification.
All recommended substitutes are ROHS3 compliant and suitable for the operating temperature range of -40°C to 85°C.
Frequently Asked Questions (FAQ)
Q: Can the 60R040XPR directly replace the RLD60P040XFF without design changes?
A: Yes. The 60R040XPR is a parametric equivalent with identical voltage, current, resistance, and thermal specifications. Mechanical form factor and lead spacing are identical, enabling direct PCB substitution.
Q: What is the difference between the 60R040XPR and 72R040XPR?
A: Both parts share identical current ratings (400 mA Ih, 800 mA It) and electrical characteristics. The 72R040XPR has a maximum voltage rating of 72V compared to 60V for the 60R040XPR. Select the 72R040XPR only if circuit voltage exceeds 60V.
Q: Can the RXEF040-AP be used as a direct replacement?
A: The RXEF040-AP is electrically equivalent but has minor dimensional differences. Thickness is 0.118" (vs. 0.122") and lead spacing is 0.199" (vs. 0.201"). PCB layout verification is required before substitution to confirm mechanical clearance and lead hole alignment.
Q: Why are PFRA series parts listed as manufacturer-recommended alternatives?
A: PFRA series parts (PFRA.010, PFRA.017, PFRA.020, PFRA.025) share the same 60V voltage rating and through-hole radial disc form factor. However, they have different current ratings (100 mA to 250 mA Ih) and are suitable only for applications where lower current protection is required. These are not direct replacements for the 400 mA RLD60P040XFF.
Q: What packaging options are available for the active equivalents?
A: The 60R040XPR and 72R040XPR are supplied in cut tape (CT) packaging. The RXEF040-AP is also available in cut tape. Original RLD60P040XFF inventory remains available in limited quantities (794 pcs).
Q: Are all substitute parts RoHS compliant?
A: Yes. All recommended substitutes are ROHS3 compliant. The RLD60P040XFF is also ROHS3 compliant.
Q: What regulatory approvals apply to each substitute?
A: The 60R040XPR and 72R040XPR carry cURus and TUV approvals. The RXEF040-AP carries expanded approvals: CQC, CSA, TUV, and UL. Select based on required regulatory compliance for your application.
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