MF-RHT550-0-14 Equivalent & Substitute Parts

Part Overview

The MF-RHT550-0-14 is a Polymeric PTC Resettable Fuse manufactured by Bourns Inc. in the Multifuse® MF-RHT series. This through-hole radial disc component provides overcurrent protection at 16V with a 5.5A hold current rating. The device is Active in product status and carries multiple international approvals including cUL, cURus, and TUV certification. Substitute parts are identified when equivalent electrical characteristics, mechanical dimensions, and compliance ratings are maintained across alternative manufacturers, ensuring direct functional replacement in circuit applications.

Key Parameters

Parameter	Value
Voltage - Max	16V
Current - Hold (Ih) (Max)	5.5 A
Current - Trip (It)	10 A
Current - Max	100 A
Time to Trip	6 s
Resistance - Initial (Ri) (Min)	15 mOhms
Resistance - Post Trip (R1) (Max)	37 mOhms
Operating Temperature	-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)	0.744" (18.90mm)
Lead Spacing	0.201" (5.10mm)
Type	Polymeric
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MF-RHT550-0-14 are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitution eligibility:

Electrical Parameters:

Maximum voltage rating: 16V
Hold current (Ih): 5.5 A
Trip current (It): 10 A
Maximum current capacity: 100 A
Time to trip: 6 seconds
Initial resistance (Ri): 15 mOhms minimum
Post-trip resistance (R1): 37 mOhms maximum
Operating temperature range: -40°C to 125°C

Mechanical Parameters:

Mounting type: Through Hole
Package configuration: Radial, Disc
Physical dimensions: 0.441" L x 0.118" W (11.20mm x 3.00mm)
Seated height: 0.744" (18.90mm)
Lead spacing: 0.201" (5.10mm)

Compliance Parameters:

Component type: Polymeric PTC Resettable Fuse
RoHS3 compliance required
MSL rating: 1 (Unlimited)

Parts meeting all specified electrical, mechanical, and compliance parameters are classified as direct substitutes.

Parameter Comparison

Parameter	MF-RHT550-0-14 (Bourns)	RS16HT-550 (OptiFuse)
Manufacturer	Bourns Inc.	OptiFuse
Series	Multifuse® MF-RHT	RS16HT
Type	Polymeric	Polymeric
Voltage - Max	16V	16V
Current - Hold (Ih) (Max)	5.5 A	5.5 A
Current - Trip (It)	10 A	10 A
Current - Max	100 A	100 A
Time to Trip	6 s	6 s
Resistance - Initial (Ri) (Min)	15 mOhms	15 mOhms
Resistance - Post Trip (R1) (Max)	37 mOhms	37 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)	0.744" (18.90mm)	0.744" (18.90mm)
Lead Spacing	0.201" (5.10mm)	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active

Engineering Selection Recommendations

MF-RHT550-0-14 (Bourns Inc.): This component carries AEC-Q200 automotive qualification in addition to cUL, cURus, and TUV approvals. The AEC-Q200 rating indicates compliance with automotive-grade reliability standards. This part is suitable for applications requiring automotive-level certification or where AEC-Q200 compliance is specified.

RS16HT-550 (OptiFuse): This substitute part maintains full electrical and mechanical equivalence with cULus and TUV approvals. The RS16HT-550 does not carry AEC-Q200 certification. This part is suitable for general industrial and consumer applications where automotive qualification is not required.

Selection Basis:

Both parts are Active in product status
Both achieve ROHS3 compliance and MSL 1 rating
Electrical performance is identical across all specified parameters
Mechanical compatibility is confirmed through identical dimensions and lead spacing
Selection between these parts depends on whether AEC-Q200 automotive certification is a design requirement

Frequently Asked Questions (FAQ)

Q: Can the RS16HT-550 replace the MF-RHT550-0-14 in all applications?

A: The RS16HT-550 provides electrical and mechanical equivalence for applications not requiring AEC-Q200 automotive certification. If your design specifies AEC-Q200 compliance, the MF-RHT550-0-14 is required. For all other applications meeting the specified electrical parameters, the RS16HT-550 is a direct substitute.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both the MF-RHT550-0-14 and RS16HT-550 share identical dimensions: 0.441" L x 0.118" W (11.20mm x 3.00mm), with a maximum seated height of 0.744" (18.90mm) and lead spacing of 0.201" (5.10mm). PCB layout and mounting hole spacing require no modification.

Q: Do both parts have the same electrical trip characteristics?

A: Yes. Both parts are specified with identical hold current (5.5A), trip current (10A), time to trip (6 seconds), and resistance parameters (15 mOhms initial, 37 mOhms post-trip maximum). Circuit protection behavior is equivalent.

Q: What is the operating temperature range for both parts?

A: Both the MF-RHT550-0-14 and RS16HT-550 operate across -40°C to 125°C. This range applies to all electrical and mechanical specifications.

Q: Are both parts RoHS compliant?

A: Yes. Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited moisture sensitivity level), indicating no special moisture handling requirements during storage or assembly.

Q: What certifications does each part carry?

A: The MF-RHT550-0-14 carries cUL, cURus, TUV, and AEC-Q200 approvals. The RS16HT-550 carries cULus and TUV approvals. The primary difference is the AEC-Q200 automotive qualification on the Bourns part.

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