Switch 2108

Switch Connection Diagram 3640.3734

The electronic switch 3640.3734 is designed to operate in non-contact ignition systems of VAZ-2108, VAZ-2109, "Tavria" and others, including foreign production, equipped with similar ignition systems with a Hall sensor.

The switch works as a unit with an ignition coil type 27.3705 and distributor 40.3706, 53.3706 or others with similar parameters.

The 3640.3734 switch uses traditional bipolar transistors as the switching element. This scheme is the most common in the world.

At pin No. 7, an output low-voltage control signal is provided for electrical systems with an electronic tachometer or other control devices.

Work with the disconnected battery or at its malfunction is not allowed.

According to the requirements for ignition systems, the switch protects the Hall sensor from overvoltage by stabilizing the voltage supplied to the sensor. The product is protected against short circuit in the power supply circuit of the Hall sensor.

The switch is designed according to a single-wire power scheme, in which the negative output of the power source is connected to the car body.

The operating mode of the switch is S1 according to GOST 3940.

The switch is installed in the place provided for it in the car using standard fasteners and a standard connector, and it is necessary to ensure reliable contact between the base of the switch and the car body.

The warranty period of operation is 3 years from the date of commissioning or from the date of sale in a retail network. The manufacturer’s warranty is valid for four years from the date of manufacture of the product.

Operating temperature range, ° С

-40 .. +85

Rated voltage, V

12, 0

Permissible limits of supply voltage, V

6, 0 .. 18, 0

Range of uninterrupted sparking, rpm of the crankshaft of a 4-stroke 4-cylinder engine

20 .. 7000

Switching current, A

7, 0 ± 0, 2

Time of sparkless cutoff of collector current, s


The maximum allowable impact of increased supply voltage lasting up to 5 min. with a sparking frequency of more than 200 Hz (6000 rpm of the crankshaft of a 4-stroke 4-cylinder engine), V

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