RGE600 Equivalent & Substitute Parts

Part Overview

The RGE600 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse, rated at 16V with a 6A hold current. This component is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The RGE600 operates as a thermal protection device in Through Hole Radial configuration, suitable for applications requiring automatic circuit protection with reset capability.

Key Parameters

Parameter	RGE600 Specification
Manufacturer	Littelfuse
Series	PolySwitch®
Product Status	Obsolete
Voltage - Max	16V
Current - Hold (Ih) (Max)	6 A
Current - Trip (It)	10.2 A
Current - Max	100 A
Time to Trip	3.3 s
Resistance - Initial (Ri) (Min)	10 mOhms
Resistance - Post Trip (R1) (Max)	28 mOhms
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.402" L x 0.098" W (10.20mm x 2.50mm)
Height - Seated (Max)	0.673" (17.10mm)
Lead Spacing	0.199" (5.05mm)
Approval Agency	CSA, TUV, UL
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the RGE600 is determined by the following critical parameters:

Electrical Compatibility Parameters:

Voltage rating must equal or exceed 16V maximum
Current hold (Ih) rating must support the circuit's nominal operating current
Current trip (It) and time to trip characteristics must align with circuit protection requirements
Resistance characteristics (initial and post-trip) must be compatible with circuit impedance

Mechanical Compatibility Parameters:

Mounting type must remain Through Hole
Package configuration must be Radial, Disc
Physical dimensions and lead spacing must fit existing PCB layouts

Compliance Parameters:

RoHS compliance status for regulatory requirements
Approval agencies (CSA, TUV, UL) for safety certification

The substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalent

RGEF600 (Littelfuse): Identical electrical specifications to RGE600, same 16V/6A rating, Active product status, improved RoHS3 compliance

Category 2: Functional Substitute with Parameter Variance

MF-RHT450-0, MF-RHT450-2, MF-RHT450-AP (Bourns): 16V rated, reduced hold current of 4.5A, different trip characteristics, Active product status, RoHS3 compliant, AEC-Q200 rated

Parameter Comparison

Parameter	RGE600	RGEF600	MF-RHT450-0	MF-RHT450-2	MF-RHT450-AP
Manufacturer	Littelfuse	Littelfuse Inc.	Bourns Inc.	Bourns Inc.	Bourns Inc.
Series	PolySwitch®	PolySwitch®, RGEF	Multifuse®, MF-RHT	Multifuse®, MF-RHT	Multifuse®, MF-RHT
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Max	16V	16V	16V	16V	16V
Current - Hold (Ih) (Max)	6 A	6 A	4.5 A	4.5 A	4.5 A
Current - Trip (It)	10.2 A	10.2 A	7.8 A	7.8 A	7.8 A
Current - Max	100 A	100 A	100 A	100 A	100 A
Time to Trip	3.3 s	3.3 s	3 s	3 s	3 s
Resistance - Initial (Ri) (Min)	10 mOhms	10 mOhms	22 mOhms	22 mOhms	22 mOhms
Resistance - Post Trip (R1) (Max)	28 mOhms	28 mOhms	54 mOhms	54 mOhms	54 mOhms
Operating Temperature	Not specified	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Size / Dimension	0.402" L x 0.098" W (10.20mm x 2.50mm)	0.402" L x 0.098" W (10.20mm x 2.50mm)	0.409" L x 0.118" W (10.40mm x 3.00mm)	0.409" L x 0.118" W (10.40mm x 3.00mm)	0.409" L x 0.118" W (10.40mm x 3.00mm)
Height - Seated (Max)	0.673" (17.10mm)	0.673" (17.10mm)	0.614" (15.60mm)	0.614" (15.60mm)	0.614" (15.60mm)
Lead Spacing	0.199" (5.05mm)	0.199" (5.05mm)	0.114" (2.90mm)	0.114" (2.90mm)	0.114" (2.90mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, TUV, UL	CSA, TUV, UL	Not specified	Not specified	Not specified

Engineering Selection Recommendations

RGEF600 (Littelfuse) is the primary substitute for RGE600. This part maintains identical electrical specifications (16V, 6A hold current, 10.2A trip current) and mechanical configuration. RGEF600 is Active product status, ensuring long-term availability. The part achieves ROHS3 compliance, addressing regulatory requirements where RGE600 does not. All three approval agencies (CSA, TUV, UL) are maintained. This substitution requires no circuit redesign and provides direct functional equivalence.

MF-RHT450-0, MF-RHT450-2, and MF-RHT450-AP (Bourns) are functional substitutes suitable for applications where the reduced hold current (4.5A versus 6A) and modified trip characteristics (7.8A versus 10.2A) are acceptable. These parts maintain 16V voltage rating and Through Hole Radial configuration. All three variants are Active product status with ROHS3 compliance and AEC-Q200 automotive qualification. The Bourns parts offer extended operating temperature range (-40°C to 125°C versus -40°C to 85°C for RGEF600). Physical dimensions differ slightly; lead spacing is reduced from 5.05mm to 2.90mm, requiring PCB layout verification. These substitutes are appropriate for new designs or applications where the lower hold current rating aligns with circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can RGEF600 be used as a direct replacement for RGE600?

A: Yes. RGEF600 is electrically and mechanically identical to RGE600, with identical voltage (16V), hold current (6A), trip current (10.2A), and physical dimensions. RGEF600 is Active product status with improved RoHS3 compliance. No circuit modifications are required.

Q: What are the key differences between RGE600 and the Bourns MF-RHT450 series?

A: The primary electrical difference is hold current: RGE600 is rated 6A while MF-RHT450 is rated 4.5A. Trip current differs correspondingly (10.2A versus 7.8A). Time to trip is slightly faster (3s versus 3.3s). Initial and post-trip resistance values are higher in the Bourns parts. Physical dimensions and lead spacing differ, requiring PCB layout verification. All parts maintain 16V voltage rating and Through Hole Radial mounting.

Q: Are the Bourns MF-RHT450 variants interchangeable with each other?

A: MF-RHT450-0, MF-RHT450-2, and MF-RHT450-AP are electrically identical. The differences are packaging format: Bulk, Cut Tape (CT), and Tape & Box (TB) respectively. Selection depends on procurement and assembly requirements, not electrical performance.

Q: What packaging options are available for RGE600 substitutes?

A: RGEF600 is supplied in Bag packaging. Bourns MF-RHT450 variants are available in three packaging formats: Bulk (MF-RHT450-0), Cut Tape (MF-RHT450-2), and Tape & Box (MF-RHT450-AP). Packaging selection affects procurement quantity and assembly process compatibility.

Q: Will the Bourns MF-RHT450 parts fit the existing PCB layout designed for RGE600?

A: Physical verification is required. While both maintain Through Hole Radial configuration, lead spacing differs: RGE600 and RGEF600 use 5.05mm spacing, while MF-RHT450 uses 2.90mm spacing. Height and length dimensions also differ slightly. PCB layout must be reviewed before substitution.

Q: What compliance certifications apply to these substitute parts?

A: RGEF600 maintains the same approval agencies as RGE600 (CSA, TUV, UL) and achieves ROHS3 compliance. Bourns MF-RHT450 variants are ROHS3 compliant and carry AEC-Q200 automotive qualification. Approval agency information is not specified for the Bourns parts.

Q: Is the RGE600 still available for procurement?

A: RGE600 is classified as Obsolete. RGEF600 (Active status, 10,580 pcs in stock) is the recommended equivalent. Bourns MF-RHT450 variants are also Active with substantial inventory availability.

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