This is information on a product in full production.
June 2012 Doc ID 11962 Rev 4 1/12
12
ACS108-6S
Overvoltage protected AC switch (ACS™)
Datasheet − production data
Features
■Needs no external protection snubber or
varistor
■Enables equipment to meet IEC 61000-4-5
■Reduces component count by up to 80%
■Interfaces directly with the micro-controller
■Common package tab connection supports
connection of several alternating current
switches (ACS) on the same cooling pad
■Integrated structure based on A.S.D.®
technology
■Overvoltage protection by crowbar technology
■High noise immunity - static dV/dt > 500 V/µs
Applications
■Alternating current on/off static switching in
appliances and industrial control systems
■Drive of low power high inductive or resistive
loads like:
– relay, valve, solenoid,
– dispenser, door lock
– pump, fan, low power motor
Description
The ACS108-6S belongs to the AC line switch
family. This high performance switch can control a
load of up to 0.8 A.
The ACS108-6S switch includes an overvoltage
crowbar structure to absorb the overvoltage
energy, and a gate level shifter driver to separate
the digital controller from the main switch. It is
triggered with a negative gate current flowing out
of the gate pin.
Figure 1. Functional diagram
®: A.S.D. is a registered trademark of STMicroelectonics
TM: ACS is a trademark of STMicroelectronics
Table 1. Device summary
Symbol Value Unit
IT(RMS) 0.8 A
VDRM/VRRM 600 V
IGT 10 mA
COM
OUT
G
SMBflat-3L
ACS108-6SUF
OUT
COM
G
COM Common drive reference to connect
to the mains
OUT Output to connect to the load.
G Gate input to connect to the controller
through gate resistor
www.st.com
Characteristics ACS108-6S
2/12 Doc ID 11962 Rev 4
1 Characteristics
Table 2. Absolute maximum ratings (Tamb = 25 °C, unless otherwise specified)
Symbol Parameter Value Unit
IT(RMS) On-state rms current (full sine wave) Tamb = 62 °C 0.45 A
Ttab = 113 °C 0.8 A
ITSM
Non repetitive surge peak on-state
current
(full cycle sine wave, Tj initial = 25 °C)
F = 60 Hz t = 16.7 ms 7.6
A
F = 50 Hz t = 20 ms 7.3
I2t I²t Value for fusing tp = 10 ms 0.38 A2s
dI/dt Critical rate of rise of on-state current
IG = 2xIGT
, tr ≤ 100 ns F = 120 Hz Tj = 125 °C 100 A/µs
VPP Non repetitive line peak mains voltage(1)
1. according to test described by IEC 61000-4-5 standard and Figure 19
Tj = 25 °C 2 kV
IGM Peak gate current tp = 20 µs Tj = 125 °C 1 A
VGM Peak positive gate voltage Tj = 125 °C 10 V
PG(AV) Average gate power dissipation Tj = 125 °C 0.1 W
Tstg
Tj
Storage junction temperature range
Operating junction temperature range
-40 to +150
-30 to +125 °C
Table 3. Electrical characteristics (Tj = 25 °C, unless otherwise specified)
Symbol Test conditions Quadrant Value Unit
IGT(1)
1. Minimum IGT is guaranteed at 10% of IGT max
VOUT = 12 V, RL = 33 ΩII - III Max. 10 mA
VGT II - III Max. 1 V
VGD VOUT = VDRM, RL =3.3 kΩ, Tj = 125 °C II - III Min. 0.15 V
IH (2) IOUT = 100 mA Max. 25 mA
IL(2) IG = 1.2 x IGT Max. 30 mA
dV/dt(2)
2. For both polarities of OUT referenced to COM
VOUT = 67% VDRM, gate open, Tj = 125 °C Min. 500 V/µs
(dI/dt)c(2
)Without snubber (15 V/µs), turn-off time ≤ 20 ms, Tj = 125 °C Min. 0.3 A/ms
VCL ICL = 0.1 mA, tp = 1 ms, Tj = 125 °C Min. 650 V
ACS108-6S Characteristics
Doc ID 11962 Rev 4 3/12
Table 4. Static electrical characteristics
Symbol Test conditions Value Unit
VTM (1)
1. For both polarities of OUT referenced to COM
ITM = 1.1 A, tp = 500 µs Tj = 25 °C Max. 1.3 V
VTO (1) Threshold voltage Tj = 125 °C Max. 0.90 V
RD (1) Tj = 125 °C Max. 300 mΩ
IDRM
IRRM
VOUT = 600 V Tj = 25 °C Max. 2µA
Tj = 125 °C 0.2 mA
Table 5. Thermal resistance
Symbol Parameter Value Unit
Rth (j-t) Junction to tab (AC) Max. 14 °C/W
Rth (j-a) Junction to ambient S = 5 cm² Max. 75
Characteristics ACS108-6S
4/12 Doc ID 11962 Rev 4
Figure 2. Maximum power dissipation
versus on-state rms current
(full cycle)
Figure 3. On-state rms current versus tab
temperature (full cycle)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
P(W)
180°
I (A)
T(RMS) 0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
0 25 50 75 100 125
I (A)
T(RMS)
T (°C)
C
Figure 4. On-state rms current versus
ambient temperature
(free air convection)
Figure 5. Relative variation of thermal
impedance junction to ambient
versus pulse duration
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0 25 50 75 100 125
I (A)
T(RMS)
T (°C)
a
1.E-02
1.E-01
1.E+00
1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
K = [Z /R ]
th(j-a) th(j-a)
t (s)
p
Figure 6. Relative variation of, holding and
latching current versus junction
temperature
Figure 7. Releative variation of IGT and VGT
versus junction temperature
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
I , [T ] / I , I [T = 25 °C]
HjHLj
I
L
IL
IH
T (°C)
j
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
I ,V [T ] / I , V [T = 25 °C]
GT GT j GT GT j
T (°C)
j
VGT
IGT
ACS108-6S Characteristics
Doc ID 11962 Rev 4 5/12
Figure 8. Non repetitive surge peak on-state
current versus number of cycles
Figure 9. Non repetitive surge peak on-state
current for a sinusoidal pulse, and
corresponding value of I²t
Figure 10. On-state characteristics (maximal
values)
Figure 11. Relative variation of critical rate of
decrease of main current versus
junction temperature
0
1
2
3
4
5
6
7
8
9
10
1 10 100 1000
Number of cycles
One cycle
t = 20 ms
I (A)
TSM
Non repetitive
T initial = 25 °C
j
Repetitive
T = 75 °C
c
0.1
1.0
10.0
100.0
0.01 0.10 1.00 10.00
I (A), I t (A s)
TSM
2
2
T initial = 25 °C
j
I²t
ITSM
t (ms)
p
pulse with width t <10 ms, and corresponding value of I²t
p
0.01
0.10
1.00
10.00
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
I (A)
TM
V (V)
TM
T max:
V = 0.9 V
R = 300 m
j
to
dΩ
T = 125 °C
j
T = 25 °C
j
0
1
2
3
4
5
6
7
8
25 50 75 100 125
(dl / dt)c[T ] / [T = 125 °C]
jj
(dl / dt)c
T (°C)
j
Figure 12. Relative variation of static dV/dt
immunity versus junction
temperature
Figure 13. Relative variation of the maximal
clamping voltage versus junction
temperature (min. value)
0
1
2
3
4
5
6
7
8
25 50 75 100 125
dV / dt [T ] / [T = 125 °C]
jj
dV / dt
T (°C)
j0.85
0.90
0.95
1.00
1.05
1.10
1.15
-30 -10 10 30 50 70 90 110 130
V [T /V [Tj = 25°C]
CL j CL
T (°C)
j
Characteristics ACS108-6S
6/12 Doc ID 11962 Rev 4
Figure 14. Relative variation of critical rate
ofdecrease of main current (di/dt)c
versus (dV/dt)c
Figure 15. Thermal resistance junction to
ambient versus copper surface
under tab
(dI/dt)c[(dV/dt)
c] / Specified (dI/dt)c
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0.1 1 10 100
(dV/dt)c(V/µs)
VOUT = 400 V
turn-off time < 20 ms
R (°C/W)
th(j-a)
50
60
70
80
90
100
110
120
130
140
150
160
170
012345
S(cm²)
Epoxy printed circuit board FR4,
copper thickness 35 µm
ACS108-6S Alternating current line switch - basic application
Doc ID 11962 Rev 4 7/12
2 Alternating current line switch - basic application
The ACS108-6S switch is triggered by a negative gate current flowing from the gate pin G.
The switch can be driven directly by the digital controller through a resistor as shown in
Figure 16.
Thanks to its overvoltage protection and turn-off commutation performance, the ACS108-6S
switch can drive a small power high inductive load with neither varistor nor additional turn-off
snubber.
Figure 16. Typical application program
2.1 Protection against overvoltage: the best choice is ACS
In comparison with standard triacs, which are not robust against surge voltage, the
ACS108-6S is over-voltage self-protected, specified by the new parameter VCL. This feature
is useful in two operating conditions: in case of turn-off of very inductive load, and in case of
surge voltage that can occur on the electrical network.
2.1.1 High inductive load switch-off: turn-off overvoltage clamping
With high inductive and low RMS current loads the rate of decrease of the current is very
low. An overvoltage can occur when the gate current is removed and the OUT current is
lower than IH.
As shown in Figure 17 and Figure 18, at the end of the last conduction half-cycle, the load
current decreases (1). The load current reaches the holding current level IH (2), and the
ACS turns off (3). The water valve, as an inductive load (up to 15 H), reacts as a current
generator and an overvoltage is created, which is clamped by the ACS (4). The current flows
through the ACS avalanche and decreases linearly to zero. During this time, the voltage
across the switch is limited to the clamping voltage VCL. The energy stored in the inductance
of the load is dissipated in the clamping section that is designed for this purpose. When the
energy has been dissipated, the ACS voltage falls back to the mains voltage value (5).
AC Mains
ACS108-6S
Valve
Power supply
MCU
Vdd
Vss Rg
Alternating current line switch - basic application ACS108-6S
8/12 Doc ID 11962 Rev 4
2.1.2 Alternating current line transient voltage ruggedness
The ACS108-6S switch is able to withstand safely the ac line transients either by clamping
the low energy spikes or by breaking over under high energy shocks, even with high turn-on
current rises.
The test circuit shown in Figure 19 is representative of the final ACS108-6S application, and
is also used to test the ac switch according to the IEC 61000-4-5 standard conditions.
Thanks to the load limiting the current, the ACS108-6S switch withstands the voltage spikes
up to 2 kV above the peak line voltage. The protection is based on an overvoltage crowbar
technology. Actually, the ACS108-6S breaks over safely as shown in Figure 20. The
ACS108-6S recovers its blocking voltage capability after the surge (switch off back at the
next zero crossing of the current).
Such non-repetitive tests can be done 10 times on each ac line voltage polarity.
Figure 17. Effect of the switching off of a high
inductive load - typical clamping
capability of ACS108-6S
Figure 18. Description of the different steps
during switching off of a high
inductive load
1
2
3
4
5
IH
VPEAK =VCL
100µs/div
I
(5 mA/div)
OUT
V
(200 V/div)
OUT IH
VCL
VOUT
IOUT
1
23
4
5
IH
VCL
VOUT
IOUT
1
23
4
5
Figure 19. Overvoltage ruggedness test
circuit for resistive and
inductive
Figure 20. Typical current and voltage
waveforms across the
ACS108-6S
2.4 kV surge
Surge generator
"1.2/50 waveform"
Rg
220
ACS108-6Sx
Rgene
2
L
5µH
R
150
Model of the load
loads with conditions equivalent to
IEC 61000-4-5 standards
IOUT
VPEAK
VOUT
200ns/div
(2 A/div)
(200 V/div)
during IEC 61000-4-5 standard test
ACS108-6S Ordering information scheme
Doc ID 11962 Rev 4 9/12
3 Ordering information scheme
Figure 21. Ordering information scheme
ACS 1 08 - 6 S UF -TR
AC switch series
Number of switches
Current
Voltage
Sensitivity
Package
Packing
08 = 0.8 A rms
6 = 600 V
S = 10 mA
UF = SMBflat-3L
TR = 13”, 5000 pieces
Package information ACS108-6S
10/12 Doc ID 11962 Rev 4
4 Package information
●Epoxy meets UL94, V0
●Lead-free packages
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 22. SMBflat-3L footprint dimensions
Table 6. SMBflat-3L dimensions
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 0.90 1.10 0.035 0.043
b 0.35 0.65 0.014 0.026
b4 1.95 2.20 0.07 0.087
c 0.15 0.40 0.006 0.016
D 3.30 3.95 0.130 0.156
E 5.10 5.60 0.201 0.220
E1 4.05 4.60 0.156 0.181
L 0.75 1.50 0.030 0.059
L1 0.40 0.016
L2 0.60 0.024
e 1.60 0.063
D
A
L 2x
LL2
L1
L1
L2 2x
EE1
b4
c
e
b 2x
millimeters
(inches)
1.20
(0.047)
2.07
(0.082)
0.51
(0.020)
0.51
(0.020) 1.20
(0.047)
3.44
(0.136)
5.84
(0.230)
2.07
(0.082)
ACS108-6S Ordering information
Doc ID 11962 Rev 4 11/12
5 Ordering information
6 Revision history
04
Table 7. Ordering information
Order code Marking Package Weight Base Qty Delivery mode
ACS108-6SUF-TR ACS1086S SMBflat-3L 46.91 mg 5000 Tape and reel
Table 8. Document revision history
Date Revision Changes
05-Jan-2005 1Initial release.
07-Jun-2006 2Reformatted to current standard. Replaced Figure 9.
14-Dec-2010 3
Added Epoxy meets UL94, V0 in Package information. Updated
ECOPACK statement. Added SMBflat-3L package. Updated
graphics.
12-Jun-2012 4Information regarding TO-92 and SOT-223 packages transferred to
STMicroelectronics datasheet ACS108.
ACS108-6S
12/12 Doc ID 11962 Rev 4
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