MF-R600-AP-99 PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The MF-R600-AP-99 is a PTC resettable fuse manufactured by Bourns Inc., rated for 30V maximum voltage with a 6A hold current (Ih). This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing circuit protection applications. The MF-R600-AP-99 functions as a polymeric positive temperature coefficient device designed for through-hole radial mounting in disc configuration, providing automatic reset capability after fault conditions are cleared.

Key Parameters

Parameter	Value
Voltage - Max	30V
Current - Hold (Ih) (Max)	6 A
Current - Trip (It)	12 A
Current - Max	40 A
Time to Trip	16 s
Mounting Type	Through Hole
Package / Case	Radial, Disc
Size / Dimension	0.760" L x 0.118" W (19.30mm x 3.00mm)
Height - Seated (Max)	1.256" (31.90mm)
Lead Spacing	0.215" (5.45mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the obsolete MF-R600-AP-99 is determined by strict equivalence across the following critical parameters:

Voltage rating: 30V maximum
Hold current (Ih): 6A maximum
Trip current (It): 12A
Maximum current capacity: 40A
Time to trip: 16 seconds
Mounting configuration: Through hole radial disc
Physical dimensions: 0.760" L x 0.118" W (19.30mm x 3.00mm)
Compliance: ROHS3 compliant

The substitute part MF-R600-AP meets all electrical and mechanical requirements for direct replacement. Both parts belong to the Bourns Multifuse® MF-R series and share identical voltage, current, and thermal trip characteristics. The primary distinction is product status: MF-R600-AP is active production, whereas MF-R600-AP-99 is obsolete.

Parameter Comparison

Parameter	MF-R600-AP-99 (Main Part)	MF-R600-AP (Substitute)
Manufacturer	Bourns Inc.	Bourns Inc.
Series	Multifuse®, MF-R	Multifuse®, MF-R
Product Status	Obsolete	Active
Voltage - Max	30V	30V
Current - Hold (Ih) (Max)	6 A	6 A
Current - Trip (It)	12 A	12 A
Current - Max	40 A	40 A
Time to Trip	16 s	16 s
Resistance - Initial (Ri) (Min)	Not specified	5 mOhms
Resistance - Post Trip (R1) (Max)	Not specified	40 mOhms
Operating Temperature	Not specified	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc
Size / Dimension	0.760" L x 0.118" W (19.30mm x 3.00mm)	0.760" L x 0.118" W (19.30mm x 3.00mm)
Height - Seated (Max)	1.256" (31.90mm)	1.256" (31.90mm)
Lead Spacing	0.215" (5.45mm)	0.402" (10.20mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS	8533.40.8070	8533.40.8070

Engineering Selection Recommendations

The MF-R600-AP is the direct substitute for the obsolete MF-R600-AP-99. Both components are manufactured by Bourns Inc. and carry identical electrical ratings and mechanical specifications. The substitute part maintains active production status, ensuring long-term availability and supply chain continuity.

Both parts satisfy ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for electronic component deployment. Moisture sensitivity level 1 (unlimited) indicates no special storage or handling precautions are required during assembly or deployment.

The lead spacing difference (0.215" versus 0.402") must be evaluated against PCB layout requirements. If the original design accommodates the 0.402" lead spacing of the MF-R600-AP, direct substitution is feasible. If PCB footprint constraints require the 0.215" spacing, alternative solutions must be sourced.

Frequently Asked Questions (FAQ)

Q: Can MF-R600-AP directly replace MF-R600-AP-99 in existing designs?

A: Yes, provided PCB lead spacing accommodates 0.402" (10.20mm) spacing. All electrical parameters, voltage ratings, current ratings, and thermal trip characteristics are identical. Physical dimensions and mounting type are equivalent.

Q: What is the significance of the product status change from obsolete to active?

A: The MF-R600-AP is in active production, ensuring component availability for new orders and future procurement. The MF-R600-AP-99 is obsolete and no longer manufactured, making substitution necessary for ongoing applications.

Q: Are there compliance or certification differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8533.40.8070) classifications. Approval agencies for the substitute include cURus and TUV certifications.

Q: What is the functional difference between initial resistance (Ri) and post-trip resistance (R1)?

A: Initial resistance (Ri) is the measured resistance of the PTC element under normal operating conditions (5 mOhms minimum). Post-trip resistance (R1) is the elevated resistance after the device has tripped and entered its protective state (40 mOhms maximum). This resistance increase limits fault current during overcurrent events.

Q: Does the operating temperature range affect substitution compatibility?

A: The substitute part specifies -40°C to 85°C operating temperature. If the original design operates within this range, substitution is compatible. The main part does not specify operating temperature limits in the provided data.

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