Automatic doors and gates make buildings more accessible and improve security. Consult this block diagram to find Littelfuse components that help the access control systems work as designed. Options include MOSFET rectifiers for control circuits, IGBT inverters for ac motors, Hall effect sensor for position sensing, and TVS diode arrays and multilevel varistors for ESD and lightning protection.

Door and window sensors networked with alarm systems improve building security. View this block diagram to identify Littelfuse electronic components that help these sensors work optimally. Options include reed sensors and actuator magnets for position sensing, ESD suppressors for wireless transmitters and receivers, and metal oxide varistors and TVS diodes to protect circuits from voltage surges.

Passive infrared (PIR) sensors work with security systems, lighting controls, and automated doors and gates to make buildings safer. A block diagram shows components Littelfuse and its subsidiary Zilog provide for these motion and presence sensors. In addition to PIR sensor units, we offer microcontrollers, reed relays and solid state relays for alarms, and several types of overvoltage protection.

Wireless security cameras need temperature sensors and ESD protection that wired security cameras do not. Block diagrams illustrate how Littelfuse supplies all the electronic components both cameras require. Shared solutions include metal oxide varistors for overvoltage protection, resettable PPTC devices for overcurrent protection, and diode arrays as solid state switches on control boards.

Smart locks prevent burglaries and report unauthorized entries. This block diagram shows access, overvoltage protection, and ESD protection solutions Littelfuse provides for these locks. Our products include reed switches to act as latches, diode arrays to protect circuits from transient voltage surges, and polymer ESD suppressors to prevent shocks to users and keep wireless signals noise-free.

Each subsystem making up a video doorbell requires overcurrent, overvoltage, and ESD protection. Littelfuse delivers, as seen in this block diagram. In addition to the required resettable PPTC devices, TVS diode arrays, and multilevel varistors, we produce NTC thermistors that protect battery packs from overheating.