LH1549AB Datasheet, PDF (1/5 Pages) Vishay Siliconix – 1 Form A Phototransistor Telecomswitch

LH1549AB/ AAC/ AACTR
Vishay Semiconductors
1 Form A Phototransistor Telecomswitch
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
Agency Approvals
• UL1577, File No. E52744 System Code H or J,
Double Protection
• CSA - Certification 093751
• BSI/BABT Cert. No. 7980
• FIMKO Approval
Applications
General Telecom Switching
- On/off-hook Control
- Dial Pulse
- Ring-current Detection
- Loop-current sensing
DIP
SMD
S1
i179049
S
S'
8
76
5
S'
1
2
3
4
e3 Pb
Pb-free
Description
A Telecom Switch consists of an optically isolated,
SPST solid-state relay (SSR) and a bidirectional input
optocoupler in a single package. The SSR is ideal for
performing switch hook and dial-pulse switching while
the optocoupler performs ring detect and loop current
sensing functions.
The SSR 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 %.
Order Information
Part
LH1549AB
LH1549AAC
LH1549AACTR
Remarks
Tubes, DIP-8
Gullwing, Tubes, SMD-8
Gullwing, Tape and Reel, SMD-8
Document Number 83840
Rev. 1.3, 26-Oct-03
www.vishay.com
1