ACST4
Overvoltage protected AC switch
Features
■ Triac with overvoltage protection
OUT
■ Low I (<10 mA) or high immunity
GT
(I <35 mA) version
GT
G
G
COM
■ High noise immunity: static dV/dt > 1000 V/µs
■ TO-220FPAB insulated package: 1500 V rms
OUT
COM
DPAK
ACST410-8B
ACST435-8B
TO-220FPAB
ACST410-8FP
ACST435-8FP
Benefits
■ Enables equipment to meet IEC 61000-4-5
■ High off-state reliability with planar technology
■ Needs no external overvoltage protection
■ Reduces the power passive component count
Figure 1.
Functional diagram
OUT
■ High immunity against fast transients
described in IEC 61000-4-4 standards
Applications
G
■ AC mains static switching in appliance and
industrial control systems
COM
■ Drive of medium power AC loads such as:
– Universal motor of washing machine drum
– Compressor for fridge or air conditioner
Table 1.
Symbol
IT(RMS)
Device summary
Value
Unit
4
A
V
Description
VDRM/VRRM
800
10
The ACST4 series belongs to the ACS™/ACST
®
IGT (ACST410)
mA
mA
power switch family built with A.S.D. (application
specific discrete) technology. This high
performance device is suited to home appliances
or industrial systems, and drives loads up to 4 A.
I
GT (ACST435)
35
This ACST4 switch embeds a Triac structure and
a high voltage clamping device able to absorb the
inductive turn-off energy and withstand line
transients such as those described in the
IEC 61000-4-5 standards. The ACST410 needs
TM: ACS is a trademark of STMicroelectronics.
only a low gate current to be activated (I < 10
GT
mA) and still shows a high noise immunity
complying with IEC standards such as
IEC 61000-4-4 (fast transient burst test).
®: A.S.D. is a registered trademark of
STMicroelectronics
December 2009
Doc ID 8766 Rev 5
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www.st.com
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