HT18 HT19
Electronic Telephone Line Switch
Ordering Information
Package Option Breakdown
Voltage 350V 350V Switch Resistance 18Ω 18Ω Dial Pulse Pin DP/DP Active High Active Low SO-8 HT18LG HT19LG
Features
❏ 350V breakdown
voltage ❏ 18Ω maximum switch resistance ❏ Current limiting protection ❏ Operates at 2.
0V input
General Description
The Supertex HT18LG and HT19LG are electronic line switch circuits that replace the mechanical hook switch contact or a discrete hook switch in a telephone handset or modem.
They switch the positive side of the telephone line using control inputs that are referenced to the negative side of the line.
In the off state, they can withstand 350V on the positive i...