Product category: Discrete Power Devices
News Release from: Fairchild Semiconductor | Subject: HSR312, HSR412, HSR312L and HSR412L
Edited by the Electronicstalk Editorial Team on 22 February 2002
More I/O isolation
from coplanar SSR design
Fairchild Semiconductor has a new line of optically coupled solid-state relays (SSRs)
The SSRs are assembled using a superior coplanar structure compared with the over-under structure typically used in competing SSRs. The coplanar structure provides a wider input-to-output isolation gap and offers additional margin for passing UL1459 line cross testing. In many cases, Fairchild SSRs combine a higher maximum operating voltage with lower on-state resistance.
This article was originally published on Electronicstalk on 22 February 2002 at 8.00am (UK)
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These benefits, along with bounce-free operation, solid-state reliability, and current limiting circuitry make them ideal for telecommunications applications.
These include on/off hook switches, dial-out relay switching, ring injection relays, general switching, and ground start applications in speaker phones, cordless phones, answering machines, fax machines, and desktop computer modems.
The solid-state relays are available in four models: HSR312, HSR412, HSR312L and HSR412L.
All consist of an AlGaAs infra-red LED optically coupled to a photovoltaic generator that drives a power mosfet detector, and all feature 4kV RMS isolation.
The HSR312 and HSR312L are capable of switching loads up to 250V, whereas the HSR412 and HSR412L are capable of switching loads up to 400V.
The HSR312L and HSR412L employ active current limit circuitry that enables the devices to withstand current transients.
The new relays feature a dual mosfet output configuration that allows for series or parallel connection.
Parallel connection of the mosfets provides lower maximum on-state resistance and higher maximum load current for all models, while series connection provides lower active current limit for the HSR312L and HSR412L models.
The solid-state relays are available in a 6-pin through hole or a 6-pin Surface-mount dual inline package.
The latter is available in tape and reel with 1000 devices on a 330mm diameter reel.
All solid-state relays are UL (standard 1577) and UL (standard 508) certified.
CSA and BABT certifications are pending.
Fairchild solid-state relays are pin-for-pin compatible with solid-state relays from Aromat, Clare, Infineon/Vishay and Toshiba.
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