Bourns Introduces its Smallest Surface Mount 54 Volt Miniature ThermalCutoff Overtemperature Protection Devices

Technic
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SE Series

Riverside, California - August 29, 2025 – Bourns is pleased to introduce its new SE Series of resettable miniature Thermal Cutoff (TCO) devices.

The SE Series is currently the industry’s smallest 54 V SMD breaker, with a footprint size of 4.7 mm x 2.8 mm. The height is only 1.23 mm. The new SE Series uses the footprint of the SC Series released in 2019, with trip temperature settings of 72 °C, 77 °C, 82 °C, and 85 °C, each with a ±5 °C tolerance range, similar to the SC Series.

The future growth of USB proliferation across the European Union will accelerate the demand for fast charging and higher powered cables. Furthermore, the Common Charger Directive, which was applied in the European Union in 2024, will require mobile phones, tablets, headphones, etc., to be equipped with a USB-C connector. However, fast charging increases the risk of heat generation from connector ingress situations, hence, the desire for greater levels of overtemperature protection.

The SE Series can support the full range of USB power delivery requirements for this growing demand and is newly developed to support 240 W to meet the upper limit of the USB PD standard.

The new SE Series is RoHS compliant*, and Bourns designed the family to better endure humid environments compared to standard TCO devices by

constructing them using the Company’s highest-rated corrosion resistance bimetal mechanism.

Features

Miniature Thermal Cutoff (TCO) device
Surface mount, smallest footprint
Overtemperature and overcurrent protection
Controls abnormal, excessive current virtually instantaneously, up to rated limits
Wide range of temperature options
High corrosion resistance
Supports USB PD 240 W (48 V / 5 A) specification
RoHS compliant*
Halogen free**

Applications

Overtemperature protection for:

- USB Type C cables (e.g., smartphones and notebooks, max. 240 W)

- Electronic cigarettes

- Heaters***

Battery cell protection for:

- Wearables

- Portable equipment

For more info, please contact us at the following address info@technicelectronics.com