STZ8043 datasheet(3/9 Pages) SSOUSA

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STZ8043 H/S/TR

Rev 2.00 (02/29/2016)

003106

STZ8043

Zero Cross

400V / 1.2A

AC Solid State Relay

STZ8043 Connection (Wiring) Diagram

Snubber Circuit

Refer to the above figure as an example of a typical wiring diagram for the STZ8043.

INPUT

The input LED is connected to a drive circuit, consisting of a power source and a limiting resistor (RIN). Assuming 5V as the supply,

calculating a value for RIN can be determined by following:

RIN

(5V – 1.5V) / 0.010A

3.5V / 0.010A

≈

350 Ω

In the above calculation, an LED drop of 1.5V and desired IF of 10mA are used. Referencing the “Input Specifications” on page 2, the

typical drop across the LED is 1.4V and the maximum drop is 1.8V. For a more precise resistor value across all expected temperature

option, the “VIN vs. Temperature” curve (Figure 05 on page 4) can be referenced.

OUPUT

The output terminals (MT1 & MT2) are connected to an AC load, with maximum peak voltage (VL) of 400V and maximum continuous

current (IL) of 1.2 amps. The load must be derated according to temperature, and a derating curve can be found in Figure 04 on page 4.

Typical loads may include resistive or inductive loads.

Examples of resistive loads include:



Light Dimming Controls (home / office / industrial lighting)



Heating Element Controls (rice cookers / deep fryers)

Examples of inductive loads include:



Motor Controls (air conditioning blowers / fan control)



Valve Controls (washing machine water flow pumps, gasoline pumps)

In general, the STZ8043 can be used in many industrial and home appliance applications where high voltages (up to 400V peak) and

loads of up to 1.2A are being switched.

SNUBBER CIRUIT

A snubber circuit (outlined in above diagram) may be added when high levels of noise and / or surge are expected from the load. These

are often found in highly inductive loads and can lead to an “inductive kick” which may potentially damage components in the circuit. The

snubber circuit consists of a resistor (RS) and a capacitor (CS) which together help dissipate charge buildup across the load. Values for

RS and CS are dependent upon the load and SSO engineering support can help determine appropriate values if needed.

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