RLD30P135UFF Equivalent & Substitute Parts

Part Overview

The RLD30P135UFF is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., part of the POLY-FUSE® RLD30 series. This through-hole radial disc component provides overcurrent protection at 30V with a 1.35A hold current rating. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing circuit protection applications and design continuity.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	1.35 A
Current - Trip (It)	2.7 A
Resistance - Initial (Ri) (Min)	40 mOhms
Resistance - Post Trip (R1) (Max)	130 mOhms
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.350" L x 0.118" W (8.90mm x 3.00mm)
Lead Spacing	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the RLD30P135UFF 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
Initial resistance (Ri): 40 mOhms minimum
Post-trip resistance (R1): 130 mOhms maximum
Operating temperature: -40°C to 85°C
Mounting configuration: Through-hole radial disc
Physical dimensions: 0.350" L x 0.118" W with 0.201" lead spacing
RoHS3 compliance

Two substitute parts meet these criteria: RUEF135-AP and 30R135UPR. Both are manufactured by Littelfuse Inc. and maintain identical electrical performance specifications and physical form factors as the obsolete RLD30P135UFF.

Parameter Comparison

Parameter	RLD30P135UFF	RUEF135-AP	30R135UPR
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Product Status	Obsolete	Active	Active
Series	POLY-FUSE®, RLD30	PolySwitch®, RUEF	POLY-FUSE®, 30R
Type	Polymeric	Polymeric	Polymeric
Voltage - Max	30V	30V	30V
Current - Hold (Ih) (Max)	1.35 A	1.35 A	1.35 A
Current - Trip (It)	2.7 A	2.7 A	2.7 A
Current - Max	40 A	100 A	40 A
Time to Trip	7.3 s	7.3 s	7.3 s
Resistance - Initial (Ri) (Min)	40 mOhms	40 mOhms	40 mOhms
Resistance - Post Trip (R1) (Max)	130 mOhms	130 mOhms	130 mOhms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.350" L x 0.118" W (8.90mm x 3.00mm)	0.350" L x 0.118" W (8.90mm x 3.00mm)	0.350" L x 0.118" W (8.90mm x 3.00mm)
Height - Seated (Max)	0.532" (14.60mm)	0.532" (14.60mm)	0.532" (14.60mm)
Lead Spacing	0.201" (5.10mm)	0.199" (5.05mm)	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	cURus, TUV	CQC, CSA, TUV, UL	cURus, TUV

Engineering Selection Recommendations

Both RUEF135-AP and 30R135UPR are active production parts that provide direct functional equivalence to the obsolete RLD30P135UFF. Selection between these two substitutes is based on product availability, packaging format, and regulatory certification requirements.

RUEF135-AP is supplied in cut tape packaging and carries expanded regulatory approvals including CQC, CSA, TUV, and UL certifications. This part is suitable for applications requiring broader international compliance documentation.

30R135UPR is supplied in cut tape packaging and maintains the original POLY-FUSE® series designation with cURus and TUV approvals. This part provides continuity with the original RLD30P135UFF series lineage and is suitable for applications with established certification requirements matching the original component.

Both parts demonstrate identical electrical performance across all critical parameters: 30V maximum voltage, 1.35A hold current, 2.7A trip current, 40 mOhms initial resistance, and 130 mOhms post-trip resistance. Lead spacing differs marginally (0.199" versus 0.201"), which remains within standard PCB design tolerances for through-hole radial components.

Frequently Asked Questions (FAQ)

Q: Can RUEF135-AP and 30R135UPR be used interchangeably with RLD30P135UFF?

A: Yes. Both substitute parts maintain identical electrical specifications and physical form factors. The marginal lead spacing difference (0.199" versus 0.201") is within standard PCB design tolerances for through-hole radial disc components and does not affect functional compatibility.

Q: What is the difference between RUEF135-AP and 30R135UPR?

A: The primary differences are packaging format and regulatory certifications. RUEF135-AP carries CQC, CSA, TUV, and UL approvals, while 30R135UPR carries cURus and TUV approvals. Both are supplied in cut tape packaging. Electrical performance and physical dimensions are identical.

Q: Why is the RLD30P135UFF obsolete?

A: The RLD30P135UFF is listed as obsolete. RUEF135-AP and 30R135UPR are active production alternatives that provide equivalent functionality and are recommended for new designs and ongoing supply requirements.

Q: Are there any differences in maximum current rating between these parts?

A: The RLD30P135UFF and 30R135UPR both specify 40A maximum current. The RUEF135-AP specifies 100A maximum current. This difference does not affect the hold current (1.35A) or trip current (2.7A) specifications that determine circuit protection performance.

Q: What certifications apply to each part?

A: RLD30P135UFF carries cURus and TUV approvals. RUEF135-AP carries CQC, CSA, TUV, and UL approvals. 30R135UPR carries cURus and TUV approvals. All three parts are ROHS3 compliant.

Q: Can these parts be used in applications requiring specific regulatory certifications?

A: Yes. Select the substitute part based on your application's certification requirements. RUEF135-AP provides the broadest regulatory coverage with CQC, CSA, TUV, and UL approvals. 30R135UPR maintains the original certification profile with cURus and TUV approvals.

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