U643B ic equivalent, flasher ic.
* Temperature and Supply Voltage Compensated Flashing Frequency
* Frequency Doubling Indicates Lamp Outage
* Relay Driver Output with High Current Carrying Ca.
The bipolar integrated circuit U643B is used in relay-controlled automotive flashers where a high-level EMC is required.
Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode.
U643B
Rev. 4727B
.
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