Datasheet4U Logo Datasheet4U.com

U643 - Flasher/ 30-mohm Shunt

General Description

The bipolar integrated circuit U643B is used in relaycontrolled automotive flashers where a high-level EMC is required.

Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode.

Key Features

  • D Temperature and supply voltage compensated flashing frequency D Frequency doubling indicates lamp outage D Relay driver output with high current carrying capacity and low saturation voltage D Minimum lamp load for flasher operation: ≥ 1 W D Very low susceptibility to EMI D Protection according to ISO/TR 7637/1 level 4 Block Diagram + VS + 49 6 C1 4 Measuring comparator K 1 V6.
  • 81 mV 20 kW K1 2 R3 Shunt 5 kW 7 30 mW K2 R1 Pulse generator 3 49 a.
  • Comparator K2 20 kW 49 a.

📥 Download Datasheet

📁 Similar Datasheet

Part Number Description Manufacturer
U6433B Flasher/ 18-m Shunt/ Frequency Doubling Disabling TEMIC Semiconductors
U642B Automotive Wipe/Wash or Interval Switch TEMIC Semiconductors
U644B Flasher/ 18-m Shunt/ Extremly Low Current Consumption TEMIC Semiconductors
U644B-FP Flasher/ 18-m Shunt/ Extremly Low Current Consumption TEMIC Semiconductors

Other Datasheets by Atmel (now Microchip Technology)

Part Number Description
U6432B Low-power Flasher IC with 18-mOMShunt
U6433B Frequency Doubling Disabling
U643B Flasher IC
U641B INTERVAL AND WIPE/WASH WIPER CONTROL IC
U642B Interval- and Wipe/ Wash Wiper Control IC

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
U643B Flasher, 30-mW Shunt Description The bipolar integrated circuit U643B is used in relaycontrolled automotive flashers where a high-level EMC is required. Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode.