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U6434B, U6435B, U643B

Table of contents:
Info of U6434B
Info of U6435B
Info of U643B

U6434B, U6435B, U643B Selling Leads, Datasheet

MFG:TFK Package Cooled:SOP8S D/C:05+(specialty)

U6434B, U6435B, U643B Datasheet download

Five Points

Part Number: U6434B

MFG: TFK

Package Cooled: SOP8S

D/C: 05+(specialty)

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U643B 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.

U643B Maximum Ratings

Reference point Pin 1

Parameters	Symbol	Value	Unit
Supply voltage Pins 2 and 6	V_S	18	V
Surge forward current tp = 0.1 ms Pins 2 and 6 tp = 300 ms Pins 2 and 6 tP = 300 ms Pin 8	I_FSM I_FSM I_FSM	1.5 1.0 30.0	A A mA
Output current Pin 3	I_O	0.3	A
Power dissipation T_amb = 95 DIP 8 SO 8 T_amb= 60 DIP 8 SO 8	P_tot P_tot P_tot P_tot	420 340 690 560	mW mW mW mW
Junction temperature	T_j	150
Ambient temperature range	T_amb	-40to+95
Storage temperature range	T_stg	-55to+150

U643B Features

` Temperature and supply voltage compensated flashing frequency
` Frequency doubling indicates lamp outage
` Relay driver output with high current carrying capacity and low saturation voltage
` Minimum lamp load for flasher operation:1 W
` Very low susceptibility to EMI
` Protection according to ISO/TR 7637/1 level 4

U643B Connection Diagram

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