LH1549AB

Control Voltage Range :
Product Type : PCB Mount
Contact Form : 1 Form A (SPST-NO)
Output Device : MOSFET
Mounting Style : Through Hole
Load Voltage Rating : 400 V
Load Current Rating : 0.12 A
Package / Case : PDIP-8


Features:

Solid State Relay
- 1 Form A (LH1525 Type)
- Current-limit Protection
- Clean, Bounce-free Switching
- Low Power Consumption
Solid State Relay and an Autopolarity Optocoupler in a Single Package
Optocoupler
- Bidirectional Current Detection
Surface Mountable
I/O Isolation Voltage, 5300 V_RMS
Lead-free component
Component in accordance to RoHS 2002/95/EC
and WEEE 2002/96/EC




Application

General Telecom Switching
- On/off-hook Control
- Dial Pulse
- Ring-current Detection
- Loop-current sensing




Specifications

Parameter	Test condition	Symbol	Value	Unit
LED continuous forward current		IF	50	mA
LED reverse voltage	Ir 10 A	VR	5.0	V
DC or peak AC load voltage	IR50 A	VL	400	V
Continuous DC load curren unidirectional operation		IL	120	mA
Ambient operating temperature range		Tamb	- 40 to + 85	°C
Storage temperature range		Tstg	- 40 to + 150	°C
Pin soldering temperature	t = 10 s max	Tsld	260	°C
Input/output isolation test voltage		VISO	5300	VRMS
Output power dissipation (continuous)		Pdiss	600	mW

Description

1 Form A Phototransistor Telecomswitch

A Telecom Switch consists of an optically isolated, SPST solid-state relay (SSR) LH1549AB and a bidirectional input optocoupler in a single package. The LH1549AB is ideal for performing switch hook and dial-pulse switching while the optocoupler performs ring detect and loop current sensing functions.

The LH1549AB is integrated on a monolithic receptor die. It features low ON-resistance, high breakdown voltage, and current-limit circuitry that protects the relay from telephone line induced lightning surges.

The optocoupler provides bidirectional current sens- ing via two anti parallel GaAIAs infrared emitting diodes. The optocoupler provides a minimum current transfer ratio (CTR) of 33 %.