UNISONIC TECHNOLOGIES CO., LTD

M54123L

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2009 Unisonic Technologies Co., Ltd

QW-R122-001,D

EARTH LEAKAGE CURRENT

DETECTOR

DESCRIPTION

The UTC M54123L is a semiconductor integrated circuit with

amplifier for a high-speed earth leakage circuit breaker.

For the amplifying parts of earth leakage circuit breaker, the

UTC M54123L consists of differential amplifier, latch circuit and

voltage regulator.

In normal operating, the UTC M54123L should be connected

to the secondary side of the ZCT (zero current transformers). Here

the ZCT detects leakage current different amplifiers’ both input.

Then the signals which have been amplified are integrated by

an external capacitor. The integrated signal connects to the input

terminal of latch circuit whose output is suitable for the

characteristics of high- speed earth leakage circuit breaker.

Until the input voltage reaches the fixed level, latch circuit

doesn’t become high. Then drives a thyristor which is connected to

latch circuit’s output terminal.

FEATURES

* With good input sensitivity current temperature characteristics

* Only need low external component count

* High noise and surge-proof

* May be used both as 100V and 200V.

* Wide temperature range : from -20 °C to +80°C

DIP-8

SOP-8

SIP-8

Lead-free:

M54123LK

Halogen-free:M54123LG

ORDERING INFORMATION

Ordering Number

Normal

Lead Free Plating

Halogen Free

Package

Packing

M54123L-S08-R

M54123LK-S08-R

M54123LG-S08-R

SOP-8

Tape Reel

M54123L-D08-T

M54123LK-D08-T

M54123LG-D08-T

DIP-8

Tube

M54123L-G08-T

M54123LK-G08-T

M54123LG-G08-T

SIP-8

Tube