B59890C120A51 – EPCOS

Overview

The EPCOS B59890C0120A051 is a ceramic PTC resettable fuse designed for overcurrent protection in sensitive electronic circuits. Its primary function is to interrupt current flow when a fault condition exceeds its trip threshold, thereby safeguarding downstream components. A critical design consideration for this device is its relatively high initial resistance (typically 150 Ohms at 25°C), which, while necessary for its tripping mechanism, can introduce a slight voltage drop and power dissipation in normal operation. Engineers must account for this quiescent power consumption to avoid unintended thermal effects or signal attenuation in low-power applications.

Key Features

• Maximum Voltage Rating: 265V
• Maximum Hold Current (Ih): 30 mA
• Trip Current (It): 60 mA
• Maximum Current Rating: 200 mA
• Typical Resistance at 25°C: 150 Ohms
• Physical Dimensions: 4.00mm x 5.00mm (Disc), 7.50mm Height

Applications

The component is engineered for deployment in systems requiring high reliability and performance under specific operating conditions. It provides functional stability across the stated design envelope.

• Protection of low-power sensor inputs in industrial automation
• Overcurrent safeguarding for small signal analog circuitry
• Current limiting in battery management systems for portable devices
• Inrush current suppression for sensitive microcontrollers