HT0638LG データシートの表示（PDF） - Supertex Inc

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HT0638LG

Electronic Line Switch

Supertex Inc 

Electronic Line Switch

Ordering Information

Breakdown Voltage

375V

Switch Resistance

15Ω

Package Option

SO-8

HT0638LG

HT0638

Features

15Ω maximum switch resistance

Current limiting protection

4 logic control inputs

Operates at 2V input

2µA maximum quiescent current at 100V

Applications

Telephone handsets

Fax machines

Answering machines

Auto-dial alarm systems

Absolute Maximum Ratings

VTPG, Input line voltage

VTP, Output line voltage

HKS continuous input voltage

LS1, LS2 continuous input voltage

DP continuous input voltage

Storage temperature

Soldering temperature*

+375V

+18V

VTPG

+20V

+5V

–65°C to +150°C

+300°C

Notes: All voltages are referenced to ground.

*Distance of 1.6mm from case for 10 seconds.

General Description

The Supertex HT0638 is an integrated electronic line switches

controllable from four logic-level inputs. These devices are

intended as a replacement for mechanical hook switches and

relays in telephones, answering machines, and similar telecom-

munications equipment. They switch the positive (Tip) side of the

telephone line using control inputs that are referenced to the

negative (Ring) side of the line. In the off state, it can hold-off 375

volts. In the on state, the series resistance is 15Ω maximum.

These devices provide adjustable current limiting via an external

sense resistor. Three of the control inputs are general purpose

and one is an override input that forces the switch to an off state

regardless of the state of the other inputs. This override input is

useful for ‘flash’ and pulse dialing purposes. Internal pull-up/

down resistors allow the inputs to be driven from single-ended

sources, push-pull sources, or left unconnected.

The HT0638 is powered from the phone line and are especially

useful in applications where external power is not available. Due

to their low quiescent current, both of these devices exceed the

on-hook resistance requirements of EIA-470-A.

Pin Configuration

TPG 1

HKS 2

GND 3

LS2 4

8 TP

7 CS

6 DP

5 LS1

For additional information, refer to application note

AN-H32.

top view

SO-8

Note: See Package Outline section for dimensions.

10-5

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