©2004 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FOD410, FOD4108, FOD4116, FOD4118 Rev. 1.1.4

8

Figure 12. Inverse-Parallel SCR Driver Circuit

1

2

3

6

5

4

240 VAC

SCR

360

Ω

R1

D1

SCR

R2

D2

LOAD

FOD420

FOD4208

FOD4216

FOD4218

FOD410

FOD4108

FOD4116

FOD4118

Suggested method of firing two, back-to-back SCR’s with a Fairchild triac driver. Diodes can be 1N4001; resistors,

R1 and R2, are optional 330

Ω.

Note: This optoisolator should not be used to drive a load directly. It is intended to be a discrete triac driver device

only.