The 1812L050/60MR from Littelfuse is a PolySwitch® 1812L Series surface-mount resettable PPTC overcurrent-protection device. It is designed for applications where resettable protection is preferred over a conventional one-time fuse and combines compact construction, low profile, low resistance, and fast response to fault currents.
At 20°C, the device has a 0.50A hold current (IH) and a 1.00A trip current (IT). During an overcurrent fault, the PPTC transitions to a high-resistance state to limit current; after the fault is removed and the device cools, it can return toward its normal low-resistance condition.
The 1812L050/60 is rated for a maximum operating voltage of 60VDC and a maximum fault current of 10A. At an 8A test current, Littelfuse specifies a maximum trip time of 0.15 seconds.
Typical power dissipation is 1.5W. Minimum initial resistance is 0.150Ω, while maximum resistance measured at 20°C one hour after tripping or after a 260°C/20-second reflow process is 1.000Ω.
The device operates over an ambient-temperature range of −40°C to +85°C, with a maximum device surface temperature of 125°C in the tripped state. Available hold current must be derated as ambient temperature increases.
The 1812L050/60 uses an 1812 surface-mount footprint, with dimensions of approximately 4.37–4.73mm × 3.07–3.41mm × 1.2–1.8mm.
Terminals are solder-plated copper with matte-tin finish. The 1812L Series is specified as MSL 1 and is listed by Littelfuse as RoHS compliant, lead-free, and halogen-free.
In the exact ordering number 1812L050/60MR, “050” identifies the 0.50A hold-current class, “/60” identifies the 60V voltage option, and MR identifies the tape-and-reel configuration used for this device. Littelfuse specifies a standard package quantity of 1,000 pieces per reel.
The exact part does not include the “-A” automotive-grade suffix; Littelfuse’s ordering system identifies “-A” as the automotive-grade option and a blank suffix as the standard version.
Littelfuse currently lists the 1812L050/60 product status as Active and identifies 1812L050/60MR as an available ordering number.
Key Specifications
- Manufacturer: Littelfuse
- Manufacturer Part Number: 1812L050/60MR
- Series: 1812L
- Product Family: PolySwitch®
- Device Type: Resettable PPTC Fuse
- Technology: Polymeric Positive Temperature Coefficient
- Mounting Type: Surface Mount
- Package Size: 1812
- Hold Current IH: 0.50A at 20°C
- Trip Current IT: 1.00A at 20°C
- Maximum Voltage: 60VDC
- Maximum Fault Current: 10A
- Maximum Trip Time: 0.15s at 8A
- Typical Power Dissipation: 1.5W
- Minimum Initial Resistance: 0.150Ω
- Maximum Post-Trip/Reflow Resistance: 1.000Ω
- Operating Temperature: −40°C to +85°C
- Maximum Tripped Surface Temperature: 125°C
- Length: 4.37–4.73mm
- Width: 3.07–3.41mm
- Thickness: 1.2–1.8mm
- Terminal Material: Solder-Plated Copper
- Terminal Finish: Matte Tin
- Moisture Sensitivity: MSL 1
- RoHS: Compliant
- Lead-Free: Yes
- Halogen-Free: Yes
- Packaging: Tape and Reel
- Packaging Code: MR
- Standard Reel Quantity: 1,000 pcs
- Version: Standard
- Product Status: Active
Typical Applications
Suitable for motherboards and peripherals, USB peripherals, PCI cards, game-console port protection, power-input circuits, and other PCB-level applications requiring resettable overcurrent protection.
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