1. The mercury wetted relay provides a high speed repeated pulse
to the D.U.T.
+250 for MOC303XM
+400 for MOC304XM
Vdc
RTEST
R = 10 kΩ
2. 100x scope probes are used, to allow high speeds and voltages.
CTEST
3. The worst-case condition for static dv/dt is established by trigger-
ing the D.U.T. with a normal LED input current, then removing the
PULSE
INPUT
MERCURY
X100
SCOPE
PROBE
WETTED
RELAY
current. The variable R
allows the dv/dt to be gradually
TEST
D.U.T.
increased until the D.U.T. continues to trigger in response to the
applied voltage pulse, even after the LED current has been
removed. The dv/dt is then decreased until the D.U.T. stops trig-
gering. τRC is measured at this point and recorded.
Figure 9. Static dv/dt Test Circuit
V
= 400 V
max
V
= 250 V
max
APPLIED VOLTAGE
WAVEFORM
APPLIED VOLTAGE
WAVEFORM
252 V
158 V
0.63 V
τRC
252
τRC
max
0.63 V
τRC
158
RC
max
dv/dt =
=
dv/dt =
=
0 VOLTS
0 VOLTS
τRC
τRC
Figure 11. Static dv/dt Test Waveform
(MOC3041M, MOC3042M, MOC3043M)
Figure 10. Static dv/dt Test Waveform
(MOC3031M, MOC3032M, MOC3033M)
Typical circuit (Fig 12, 13) for use when hot line switching is required. In this circuit the “hot” side of the line is switched and the load
connected to the cold or neutral side. The load may be connected to either the neutral or hot line.
R
is calculated so that I is equal to the rated I of the part, 5 mA for the MOC3033M and MOC3043M, 10 mA for the MOC3032M
F FT
in
and MOC3042M, or 15 mA for the MOC3031M and MOC3041M. The 39 ohm resistor and 0.01 µF capacitor are for snubbing of the
triac and may or may not be necessary depending upon the particular triac and load used.
Rin
Rin
360Ω
180Ω
1
2
6
5
1
2
6
5
HOT
VCC
HOT
VCC
MOC3041M
MOC3042M
MOC3043M
MOC3031M
MOC3032M
MOC3033M
39Ω
39Ω
*
*
3
4
3
4
240 VAC
115 VAC
0.01
0.01
330
1 k
LOAD
NEUTRAL
LOAD
NEUTRAL
For highly inductive loads (power factor < 0.5), change this value to 360 ohms.
For highly inductive loads (power factor < 0.5), change this value to 360 ohms.
*
*
Figure 13. Hot-Line Switching Application Circuit
(MOC3041M, MOC3042M, MOC3043M)
Figure 12. Hot-Line Switching Application Circuit
(MOC3031M, MOC3032M, MOC3033M)
6
www.fairchildsemi.com
MOC3031M, MOC3032M, MOC3033M, MOC3041M, MOC3042M, MOC3043M Rev. 1.0.1
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
