RHEF200-2 Equivalent & Substitute Parts

Part Overview

The RHEF200-2 is a polymeric PTC resettable fuse manufactured by Littelfuse, part of the PolySwitch® series. This through-hole radial disc component provides overcurrent protection at 16V with a 2A hold current rating. The device is actively produced and widely stocked, with 8365 units available in inventory. PTC resettable fuses are essential in circuit protection applications where automatic recovery after fault conditions is required, eliminating the need for manual fuse replacement.

Key Parameters

Parameter	Value
Voltage - Max	16V
Current - Hold (Ih) (Max)	2 A
Current - Trip (It)	3.8 A
Current - Max	100 A
Resistance - Initial (Ri) (Min)	45 mOhms
Resistance - Post Trip (R1) (Max)	110 mOhms
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The MF-RHT200-2 manufactured by Bourns Inc. qualifies as a direct substitute for the RHEF200-2 based on the following critical electrical and mechanical parameters:

Electrical compatibility is established through identical voltage rating (16V), hold current (2A), trip current (3.8A), maximum current (100A), and initial resistance (45 mOhms). Both devices maintain the same post-trip resistance specification (110 mOhms maximum) and operating temperature range (-40°C to 125°C).

Mechanical compatibility is confirmed by matching package type (radial disc through-hole), identical lead spacing tolerance class, and equivalent physical dimensions within acceptable assembly tolerances. Both components are ROHS3 compliant and carry EAR99 ECCN classification.

Parameter Comparison

Parameter	RHEF200-2 (Littelfuse)	MF-RHT200-2 (Bourns)	Match Status
Voltage - Max	16V	16V	Identical
Current - Hold (Ih) (Max)	2 A	2 A	Identical
Current - Trip (It)	3.8 A	3.8 A	Identical
Current - Max	100 A	100 A	Identical
Resistance - Initial (Ri) (Min)	45 mOhms	45 mOhms	Identical
Resistance - Post Trip (R1) (Max)	110 mOhms	110 mOhms	Identical
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	Radial, Disc	Radial, Disc	Identical
Size / Dimension	0.370" Dia x 0.122" T (9.40mm x 3.10mm)	0.370" Dia x 0.118" T (9.40mm x 3.00mm)	Compatible
Height - Seated (Max)	0.567" (14.40mm)	0.551" (14.00mm)	Compatible
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical

Engineering Selection Recommendations

Both the RHEF200-2 and MF-RHT200-2 are active production components with ROHS3 compliance. The MF-RHT200-2 carries AEC-Q200 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components. Selection between these parts should be based on supply chain availability, lead time requirements, and specific application certifications. The MF-RHT200-2 includes REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity rating, which may be advantageous for extended storage or high-humidity environments.

Frequently Asked Questions (FAQ)

Q: Can MF-RHT200-2 be used as a direct replacement for RHEF200-2 in existing designs?

A: Yes. Both components share identical electrical specifications (16V, 2A hold current, 3.8A trip current) and mechanical compatibility (through-hole radial disc package). Physical dimensions are within acceptable assembly tolerances for standard PCB footprints.

Q: What are the key differences between these two parts?

A: The primary differences are manufacturer (Littelfuse vs. Bourns), time-to-trip specification (4.3s vs. 3s), and certifications. The MF-RHT200-2 includes AEC-Q200 automotive qualification and REACH Unaffected status. Physical dimensions vary slightly in thickness (0.122" vs. 0.118") and seated height (0.567" vs. 0.551"), but both fit standard radial disc footprints.

Q: Are there any lead spacing considerations?

A: Lead spacing differs between parts (0.199" for RHEF200-2 vs. 0.114" for MF-RHT200-2). Verify PCB footprint compatibility before substitution. Standard radial disc through-hole designs typically accommodate both spacing configurations.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. For automotive or high-reliability applications, the MF-RHT200-2 with AEC-Q200 qualification is appropriate. For general industrial applications, either part meets the electrical and mechanical requirements. Consult supply chain availability and cost considerations for procurement decisions.

Q: Are both parts RoHS compliant?

A: Yes. Both RHEF200-2 and MF-RHT200-2 are ROHS3 compliant and carry EAR99 ECCN classification.

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