The IL420 and IL4208 consists of a GaAs IRLED optically
coupled to a photosensitive non-zero crossing TRIAC
network. The TRIAC consists of two inverse parallel
connected monolithic SCRs. These three semiconductors
are assembled in a six pin dual in-line package.
High input sensitivity is achieved by using an emitter
follower phototransistor and a cascaded SCR predriver
resulting in an LED trigger current of less than 2 mA (DC).
The use of a proprietary dV/dt clam results in a static dV/dt
of greater than 10 kV/μs. This clamp circuit has a MOSFET
that is enhanced when high dV/dt spikes occur between
MT1 and MT2 of the TRIAC. When conducting, the FET
clamps the base of the phototransistors, disabling the first
stage SCR predriver.
The 600 V, 800 V blocking voltage permits control of offline
voltages up to 240 VAC, with a safety factor of more than
two, and is sufficient for as much as 380 VAC.
The IL420, IL4208 isolates low-voltage logic from 120 VAC,
240 VAC, and 380 VAC lines to control resistive, inductive, or
capacitive loads including motors, solenoids, high current
thyristors or TRIAC and relays.
• High input sensitivity IFT = 2 mA
• 600 V, 800 V blocking voltage
• 300 mA on-state current
• High static dV/dt 10 kV/μs
• Very low leakage < 10 μA
• Isolation test voltage 5300 VRMS
• Small 6-pin DIP package
• Material categorization: For definitions of compliance
please see www.vishay.com/doc?99912
• Solid state relays
• Industrial controls
• Office equipment
• Consumer appliances