72R020XU LITTELFUSE Fuse (Other) In Stock
Littelfuse 72R020XU is a through-hole disk PTC resettable fuse rated at 0.20 A hold current with a measured resistance of 1.83 to 4.4 ohms at 23°C in a bulk disk package. It automatically resets after an overcurrent event is cleared, providing repeated protection without manual replacement. Used for circuit protection in consumer electronics, industrial controls, and battery-powered devices.
- Manufacturer
- LITTELFUSE
- Package
- Other
- Pin Count
- 2
- Lifecycle
- OBSOLETE
- Datasheet
- 72R020XU Datasheet PDF
- Category
- Fuse
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 0.20 A hold current with automatic reset after fault clearance eliminates the need for fuse replacement
- Initial resistance of 1.83 to 4.4 ohms at 23°C enables predictable overcurrent trip behavior in circuit designs
- Through-hole disk package provides robust PCB mounting for industrial and consumer circuit protection
- Unlimited resettable operation reduces maintenance downtime and total cost of protection compared to one-time fuses
Applications
The Littelfuse 72R020XU PTC resettable fuse protects circuits against overcurrent damage in consumer electronics, industrial control panels, and battery-powered equipment where automatic recovery is required. Its 0.20 A hold current and self-resetting behavior make it ideal for USB power ports, motor controllers, and telecom line cards where repeated fault events may occur. The through-hole disk package provides a reliable, easy-to-install solution for designs requiring repeatable overcurrent protection without fuse replacement.
Specifications
| Reach Compliance Code | Unknown |
| YTEOL | 0 |
| Additional Feature | 1.83 TO 4.4 OHMS MEASURED AT 23 DEG CEL |
| JESD-609 Code | e3 |
| Manufacturer Series | 72R |
| Mounting Feature | THROUGH HOLE MOUNT |
| Package Shape | DISK PACKAGE |
| Packing Method | BULK |
| Resistor Type | PTC RESETTABLE FUSE |
| Subcategory | Non-linear Resistors |
| Surface Mount | NO |
| Terminal Finish | Tin (Sn) |
| Terminal Placement | RADIAL |
| Terminal Shape | WIRE |
| Thermistor Application | OVERLOAD PROTECTION |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8533.40.80.70 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What hold current and initial resistance does the Littelfuse 72R020XU specify for circuit protection design?
The Littelfuse 72R020XU specifies a 0.20 A hold current, allowing normal conduction below this threshold. Its initial resistance measures between 1.83 and 4.4 ohms at 23°C, enabling designers to calculate normal-operating voltage drop and select appropriate trip margins for overcurrent protection circuits in low-power electronic systems.
In which overcurrent protection scenarios does the 72R020XU offer advantages over traditional one-time fuses?
The 72R020XU's automatic reset after fault clearance outperforms one-time glass fuses in USB power ports, motor starters, and telecom line cards where repeated overcurrent events occur. A 0.20 A hold current suits low-power loads, and field personnel need never carry replacement fuses, reducing maintenance burden and unplanned equipment downtime.
How does the through-hole disk package of the 72R020XU support PCB mounting in vibration-prone environments?
The through-hole disk package of the 72R020XU provides soldered lead connections for strong mechanical retention, which is critical in vibration-prone industrial environments. This mounting method also aids heat dissipation when the device switches to high-resistance protection mode above 0.20 A, limiting current until the fault clears and the device thermally resets.
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About LITTELFUSE
LITTELFUSE is a leading electronic component manufacturer. FindMyChip sources LITTELFUSE ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
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