PFMF.125.2 Circuit Protection

Resistance - Initial (Ri) (Min):	35 mOhms
Approvals:	cURus, TUV
Lead Spacing:	--
Thickness (Max):	0.033" (0.85mm)
Height - Seated (Max):	--
Size / Dimension:	0.179" L x 0.128" W (4.55mm x 3.24mm)
Package / Case:	1812 (4532 Metric), Concave
Mounting Type:	Surface Mount
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	140 mOhms
Series:	PFMF
Time to Trip:	400ms
Current - Trip (It):	2.5A
Current - Hold (Ih) (Max):	1.25A
Current - Max:	100A
Voltage - Max:	6V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC resettable fuses are widely used in the fields of automotive, aerospace, consumer electronics and power management, and come in various sizes and designs. They are typically used to protect circuits by limiting excessive current flow to an acceptable level, and resetting, or “tripping”, when the current level exceeds a predetermined threshold.
The PFMF.125.2 resettable fuse, also called the Slow-Blow PTC (SMD), is a 0.125" form factor PTC resettable fuse designed to provide circuit protection during the start up of inductive circuits. It\'s rated for currents up to 32 amps and operating voltages up to 30 volts DC. The SMD is compatible with the standard JEDEC SOIC-8 footprint and is UL and CSA Recognized for use in medical applications.
The design of the PFMF.125.2 fuse is based on a Polymer PTC element, built on a silicone substrate. The PTC element contains a proprietary blend of polymer and has a relatively low thermal conductivity. The body of the fuse is constructed of a high-temperature thermoplastic, reinforced with a metallic center contact. The center contact provides a reference point for measuring the current flowing through the device.
The working principle behind the PFMF.125.2 relies on a carefully-controlled thermal response that begins when the fuse is energized. The current flowing through the device will cause the internal PTC to heat up and expand, creating a low-resistance path for further current flow. At a predetermined current level, the temperature of the PTC element will become too hot, causing it to become more resistive and reducing the current that can flow through it. As the current is reduced, the internal temperature will drop and the PTC will begin to self-cool, allowing the current to flow again.
The advantage of using a PFMF.125.2 fuse over traditional fuses is that it can be reset multiple times, which can save time and money in the event of multiple faults. Additionally, the fuse can also be used to curtail over-current protection by monitoring the current flow and controlling the amount of current that can pass through the device. As long as the current remains within predetermined limits, the fuse will remain in a “low resistance” state and will protect the circuit against thermal and short-circuit damage, while also preventing too much current flow.
In summary, the PFMF.125.2 is a versatile resettable fuse designed to provide circuit protection during the start up of high-current inductive load circuits, and is suitable for use in a wide variety of applications. By using a physical polymer-based element, the fuse is able to reset itself multiple times, which can prevent costly and time-consuming repairs or replacements. The self-monitoring current limit feature further enhances the device’s protection capabilities, while also providing over-current protection if the current exceeds a predetermined level. Overall, the PFMF.125.2 provides a cost-effective and reliable solution for protecting circuits in a variety of applications.

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