MF-R050-AP-17 Equivalent & Substitute Parts

Part Overview

The Bourns MF-R050-AP-17 is a polymeric PTC resettable fuse rated for 60V maximum voltage with a 500 mA hold current. This component functions as an automatic circuit protection device that trips at 1 A and resets after the fault condition is removed. The part is manufactured in a through-hole radial disc package and is actively produced. Substitute parts are identified when packaging configurations differ while maintaining identical electrical and mechanical specifications, allowing for flexible procurement and assembly options.

Key Parameters

Parameter	Value
Voltage - Max	60V
Current - Hold (Ih) (Max)	500 mA
Current - Trip (It)	1 A
Current - Max	40 A
Time to Trip	4 s
Resistance - Initial (Ri) (Min)	410 mOhms
Resistance - Post Trip (R1) (Max)	1.17 Ohms
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.311" Dia x 0.122" T (7.90mm x 3.10mm)
Lead Spacing	0.201" (5.10mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MF-R050-AP-17 are identified based on electrical and mechanical parameter equivalence within the Bourns Multifuse® MF-R series. The substitution criteria are strictly limited to the following parameters:

Voltage - Max: 60V
Current - Hold (Ih) (Max): 500 mA
Current - Trip (It): 1 A
Current - Max: 40 A
Time to Trip: 4 s
Resistance - Initial (Ri) (Min): 410 mOhms
Resistance - Post Trip (R1) (Max): 1.17 Ohms
Operating Temperature: -40°C ~ 85°C
Mounting Type: Through Hole
Package / Case: Radial, Disc
Size / Dimension: 0.311" Dia x 0.122" T (7.90mm x 3.10mm)
Lead Spacing: 0.201" (5.10mm)
RoHS Status: ROHS3 Compliant

The primary difference between the main part and substitute parts is packaging configuration. The MF-R050-AP-17 is supplied in Tape & Reel (TR) format, while substitute parts are available in Cut Tape (CT) packaging. This distinction affects procurement and automated assembly processes but does not alter component functionality or electrical performance.

Parameter Comparison

Parameter	MF-R050-AP-17	MF-R050-2	MF-R050-AP
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.
Series	Multifuse®, MF-R	Multifuse®, MF-R	Multifuse®, MF-R
Type	Polymeric	Polymeric	Polymeric
Voltage - Max	60V	60V	60V
Current - Hold (Ih) (Max)	500 mA	500 mA	500 mA
Current - Trip (It)	1 A	1 A	1 A
Current - Max	40 A	40 A	40 A
Time to Trip	4 s	4 s	4 s
Resistance - Initial (Ri) (Min)	410 mOhms	410 mOhms	410 mOhms
Resistance - Post Trip (R1) (Max)	1.17 Ohms	1.17 Ohms	1.17 Ohms
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	0.311" Dia x 0.122" T (7.90mm x 3.10mm)	0.311" Dia x 0.122" T (7.90mm x 3.10mm)	0.311" Dia x 0.122" T (7.90mm x 3.10mm)
Height - Seated (Max)	0.539" (13.70mm)	0.539" (13.70mm)	0.539" (13.70mm)
Lead Spacing	0.201" (5.10mm)	0.201" (5.10mm)	0.201" (5.10mm)
Packaging	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All three parts—MF-R050-AP-17, MF-R050-2, and MF-R050-AP—are active products from Bourns Inc. and are ROHS3 compliant. The MF-R050-AP-17 carries AEC-Q200 ratings and approvals from cUL, cURus, TUV, and UL. The substitute parts MF-R050-2 and MF-R050-AP carry approvals from cURus and TUV.

Selection between these parts is determined by packaging requirements and supply chain considerations rather than electrical performance. The MF-R050-AP-17 in Tape & Reel packaging is suitable for high-volume automated assembly operations. The MF-R050-2 and MF-R050-AP in Cut Tape packaging are appropriate for lower-volume applications, manual assembly, or when tape-and-reel equipment is unavailable. All three parts deliver identical circuit protection characteristics and are interchangeable from a functional standpoint.

Frequently Asked Questions (FAQ)

Q: Can MF-R050-2 or MF-R050-AP be used as direct replacements for MF-R050-AP-17?

A: Yes. All three parts share identical electrical specifications, including voltage rating, current thresholds, trip time, and resistance characteristics. The only difference is packaging format. Functionally, they are interchangeable in circuit applications.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel packaging supplies components on a continuous reel suitable for automated pick-and-place assembly equipment. Cut Tape packaging provides components on tape segments without the reel, typically used for manual assembly or lower-volume production runs.

Q: Are there compliance or certification differences between the substitute parts?

A: The MF-R050-AP-17 carries AEC-Q200 ratings and approvals from cUL, cURus, TUV, and UL. The substitute parts MF-R050-2 and MF-R050-AP carry approvals from cURus and TUV. Applications requiring AEC-Q200 compliance must use the MF-R050-AP-17.

Q: Do all three parts operate across the same temperature range?

A: Yes. All three parts operate from -40°C to 85°C, ensuring consistent performance across the specified temperature range.

Q: What is the lead spacing for these components?

A: All three parts have a lead spacing of 0.201" (5.10mm), ensuring identical PCB footprint compatibility.

Q: Are these parts RoHS compliant?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected.

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