RHEF600S Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The RHEF600S is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® RHEF series. This component is rated for 16V maximum voltage with a 6A hold current and is designed for through-hole radial mounting in disc configuration. The RHEF600S is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Max	16V
Current - Hold (Ih) (Max)	6 A
Current - Trip (It)	10.8 A
Current - Max	100 A
Time to Trip	5 s
Resistance - Initial (Ri) (Min)	13 mOhms
Resistance - Post Trip (R1) (Max)	32 mOhms
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.441" L x 0.118" W (11.20mm x 3.00mm)
Height - Seated (Max)	0.827" (21.00mm)
Lead Spacing	0.199" (5.05mm)
Approval Agency	CSA, TUV, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the RHEF600S is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters must match identically for a part to serve as a direct substitute:

Voltage rating: 16V maximum
Current hold specification: 6A maximum
Current trip specification: 10.8A
Time to trip: 5 seconds
Initial resistance: 13 mOhms minimum
Post-trip resistance: 32 mOhms maximum
Operating temperature range: -40°C to 125°C
Mounting configuration: Through-hole radial disc
Physical dimensions: 0.441" L x 0.118" W with 0.199" lead spacing
Regulatory compliance: CSA, TUV, UL certification

The RHEF600 meets all these criteria and qualifies as a direct substitute for the obsolete RHEF600S.

Parameter Comparison

Parameter	RHEF600S (Main Part)	RHEF600 (Substitute)	Match
Voltage - Max	16V	16V	✓
Current - Hold (Ih) (Max)	6 A	6 A	✓
Current - Trip (It)	10.8 A	10.8 A	✓
Current - Max	100 A	100 A	✓
Time to Trip	5 s	5 s	✓
Resistance - Initial (Ri) (Min)	13 mOhms	13 mOhms	✓
Resistance - Post Trip (R1) (Max)	32 mOhms	32 mOhms	✓
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	Radial, Disc	Radial, Disc	✓
Size / Dimension	0.441" L x 0.118" W (11.20mm x 3.00mm)	0.441" L x 0.118" W (11.20mm x 3.00mm)	✓
Height - Seated (Max)	0.827" (21.00mm)	0.827" (21.00mm)	✓
Lead Spacing	0.199" (5.05mm)	0.199" (5.05mm)	✓
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Product Status	Obsolete	Active	Active preferred

Engineering Selection Recommendations

The RHEF600 is the appropriate substitute for the obsolete RHEF600S. Both parts are manufactured by Littelfuse Inc. within the PolySwitch® RHEF series and maintain identical electrical specifications, mechanical dimensions, and regulatory certifications. The RHEF600 carries active product status, ensuring continued availability and manufacturing support. Both components hold CSA, TUV, and UL approvals and comply with ROHS3 requirements. The transition from RHEF600S to RHEF600 presents no functional or compliance risk for circuit protection applications requiring 16V, 6A hold current specifications.

Frequently Asked Questions (FAQ)

Q: Can RHEF600 be used as a direct replacement for RHEF600S in existing designs?

A: Yes. The RHEF600 is electrically and mechanically identical to the RHEF600S across all specified parameters. Both components share the same voltage rating, current specifications, resistance characteristics, operating temperature range, physical dimensions, and regulatory certifications. The primary difference is product status: RHEF600S is obsolete while RHEF600 is active.

Q: Are there any packaging differences between RHEF600S and RHEF600?

A: The RHEF600S is supplied in standard packaging, while the RHEF600 is supplied in bag packaging. This difference does not affect component functionality or performance in circuit applications.

Q: What regulatory certifications apply to both parts?

A: Both RHEF600S and RHEF600 carry CSA, TUV, and UL approvals. Both components are ROHS3 compliant and REACH unaffected.

Q: Are the physical dimensions identical?

A: Yes. Both parts measure 0.441" L x 0.118" W (11.20mm x 3.00mm) with a maximum seated height of 0.827" (21.00mm) and lead spacing of 0.199" (5.05mm). They are both configured as through-hole radial disc components.

Q: What is the operating temperature range for these components?

A: Both RHEF600S and RHEF600 operate across -40°C to 125°C, supporting applications in standard industrial and consumer environments.

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