Solid-state relays are optically coupled
The LH1500 series of solid-state relays provide 3,750 V of
input-to-output isolation. Comprising the LH1514, LH1571, and the
LH1527/157, the line contains monolithic solid-state relays rated at less
than 1 A. With the exception of the LH1571, which is not optically
isolated, all have BABT certification and are UL- and CSA-certified and
come packaged in an 8-pin DIP or surface-mount gull-wing form. The LH1514
is a normally open relay with an on-resistance of 5 ohms for critical T1
protection switching. It can switch DS1, DS1A (CEPT), DS1C, and DS2 rates
from T1 carriers at rates of up to 50 MHz. High-frequency operation is
achieved by integrating T termination into the die. The LH1571 is a
specialty relay for digital lines in PBX, Central offices, and ISDN Basic
Rate applications. The device switches battery voltage to a telephone line
while providing current-limiting protection to UL 1459. The LH1526/1537
relays are the first to offer guaranteed break-before-make operation in a
single-chip solid-state device. The 250- and 400-V devices, respectively,
are available in a 6-pin package. An 8-pin version is also available.
(LH1514, $3.65; LH1571, $1.28; LH1527, 6-pin package, $3.12, 8-pin
package, $4.10; LH1437, $2.96 ea/10,000–2 to 3 weeks ARO.) AT&T
Microelectronics Allentown, PA Sales Dept. 800-372-2447
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