ACS108-8SN
Datasheet
0.8 A - 800 V overvoltage protected AC switch (ACS™)
Features
COM
•
G
COM
OUT
•
•
•
•
SOT-223
•
OUT
Applications
•
G
COM
OUT
G
Enables equipment to meet IEC 61000-4-5 surge with overvoltage crowbar
technology
High noise immunity against static dV/dt and IEC 61000-4-4 burst
Needs no external protection snubber or varistor
Reduces component count by up to 80% and Interfaces directly with the microcontroller
Common package tab connection supports connection of several alternating
current switches on the same cooling pad
VCL gives headroom before clamping then crowbar action
•
COM
Common drive reference to connect
to the mains
Output to connect to the load.
Gate input to connect to the controller
through gate resistor
Product status link
ACS108-8SN
Product summary
IT(RMS)
0.8 A
VDRM, VRRM
800 V
IGT
10 mA
Alternating current on/off static switching in appliances and industrial control
systems
Driving low power high inductive or resistive loads like:
–
relay, valve, solenoid, dispenser
–
pump, fan, low power motor, door lock, air flow dumper
–
lamp
Description
The ACS108-8SN belongs to the AC switch range (built with A. S. D.® technology).
This high performance switch can control a load of up to 0.8 A.
This device switch includes an overvoltage crowbar structure to absorb the inductive
turn-off 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.
Note:
®: A.S.D. is a registered trademark of STMicroelectronics
Note:
TM: ACS is a trademark of STMicroelectronics
DS12893 - Rev 2 - August 2019
For further information contact your local STMicroelectronics sales office.
www.st.com
ACS108-8SN
Characteristics
1
Characteristics
Table 1. Absolute maximum ratings (Tamb = 25 °C, unless otherwise specified)
Symbol
IT(RMS)
Parameter
On-state rms current (full sine wave), S = 5cm²
Non repetitive surge peak on-state current
Tj initial = 25 °C, (full cycle sine wave)
ITSM
I2t
I2t for fuse selection
Critical rate of rise on-state current IG = 2 x IGT, tr ≤ 100 ns
dI/dt
(1)
Tamb = 76 °C
Ttab = 104 °C
Value
Unit
0.8
A
tp = 20 ms
13
tp = 16.7 ms
13.7
tp = 10 ms
1.1
A2s
f = 120 Hz, Tj = 125 °C
100
A/μs
2
kV
A
VPP
Non repetitive line peak pulse voltage
PG(AV)
Average gate power dissipation
Tj = 125 °C
0.1
W
VGM
Peak positive gate voltage
Tj = 125 °C
10
V
IGM
Peak gate current (tp = 20 μs)
Tj = 125 °C
1
A
Tstg
Storage temperature range
-40 to +150
°C
Operating junction temperature range
-30 to +125
°C
Tj
1. according to test described by standard IEC 61000-4-5, see Figure 17. Overvoltage ruggedness test circuit for resistive and
inductive loads, Tamb = 25 °C (conditions equivalent to IEC 61000-4-5 standard) for conditions
Table 2. Electrical characteristics (Tj = 25 °C, unless otherwise specified)
Symbol
IGT
Test conditions
Quadrant
(1)
VGT
VGD
VOUT = 12 V, RL = 33 Ω
II - III
VOUT = VDRM, RL = 3.3 kΩ, Tj = 125 °C
II - III
Value
Unit
Max.
10
mA
Max.
1.0
V
Min.
0.15
V
IH
IOUT = 100 mA
Max.
10
mA
IL
IG = 1.2 x IGT
Max.
25
mA
dV/dt
(dI/dt)c
VCL
VOUT = 402 V, gate open, Tj = 125 °C
VOUT = 536 V, gate open, Tj = 125 °C
Min.
2000
400
V/μs
Without snubber (15 V/μs), Tj = 125 °C, turn-off time ≤20 ms
Min.
2
A/ms
ICL = 0.1 mA, tp = 1 ms
Min.
850
V
1. Minimum IGT is guaranteed at 10% of IGT max.
DS12893 - Rev 2
page 2/14
ACS108-8SN
Characteristics
Table 3. Static electrical characteristics
Symbol
VTM (1)
Test conditions
Value
Unit
ITM = 1.1 A, tp = 500 μs
Tj = 25 °C
Max.
1.3
V
VTO
Threshold voltage
Tj = 125 °C
Max.
0.85
V
Rd(1)
Dynamic resistance
Tj = 125 °C
Max.
300
mΩ
2
µA
0.2
mA
(1)
IDRM
IRRM
Tj = 25 °C
VOUT = VDRM/ VRRM
Tj = 125 °C
Max.
1. For both polarities of OUT pin referenced to COM pin
Table 4. Thermal characteristics
Symbol
DS12893 - Rev 2
Parameter
Rth(j-t)
Junction to tab (AC)
Rth(j-a)
Junction to ambient
Max. value
25
S = 5 cm²
Max.
60
Unit
°C/W
page 3/14
ACS108-8SN
Characteristics (curves)
1.1
Characteristics (curves)
Figure 1. Maximum power dissipation versus rms on-state
current
0.9
P (W)
0.9
α = 180°
0.8
Figure 2. On-state rms current versus case temperature
α = 180 °
0.8
SOT-223
0.7
0.7
0.6
0.6
0.5
0.5
0.4
0.4
0.3
0.3
0.2
0.2
180°
0.1
0.1
IT(RMS) ( A)
0.0
0.0
TC ° C
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Figure 3. On-state rms current versus ambient
temperature (free air convection)
0.9
IT(RMS) (A)
0
25
50
75
100
125
Figure 4. Relative variation of thermal impedance junction
to case versus pulse duration
IT(RMS) (A)
1.00
K=[Zth(j-a) /Rth(j-a) ]
Zth(j -a)
α =180 °
0.8
SOT-223
0.7
0.6
0.5
0.10
0.4
0.3
SOT-223
0.2
Single layer Printed
circuit board FR4
0.1
Natural convection
0.0
0
DS12893 - Rev 2
25
50
75
100
SOT-223
Copper surface
area = 5cm²
t P (s)
Ta °C
125
0.01
1.0E-03
1.0E-02
1.0E-01
1.0E+00
1.0E+01
1.0E+02
1.0E+03
page 4/14
ACS108-8SN
Characteristics (curves)
Figure 5. Relative variation of holding and latching
current versus junction temperature
IH, I L [T j] / IH, IL [T j=25 ° C]
3.0
Figure 6. Relative variation of IGT and VGT versus junction
temperature
IGT, VGT [T j ] / IGT, VGT, [ Tj =25 °C]
3.5
3.0
2.5
IL
IGT Q2
IGT Q3
2.5
2.0
2.0
1.5
IH
1.5
1.0
1.0
0.5
0.5
Tj (°C)
Tj (°C)
0.0
0.0
-50
-25
0
25
50
75
100
125
Figure 7. Surge peak on-state current versus number of
cycles
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
VGT Q2-Q3
-50
-25
0
25
50
100
125
Figure 8. Non repetitive surge peak on-state current for a
sinusoidal pulse
ITSM(A)
1.E+03
ITSM(A)
t=20ms
Sinusoidal pulse,
tp < 10 ms
Tj initial = 25 °C
ITSM
1.E+02
One cycle
75
Non repetitive
Tj initial=25 °C
SOT-223
Repetitive
Ttab = 104 °C
1.E+01
1.E+00
t p(ms)
Number of cycles
1
10
100
1000
Figure 9. On-state characteristics (maximum values)
100.00
1.E-01
0.01
0.10
1.00
10.00
Figure 10. Relative variation of critical rate of decrease of
main current versus junction temperature
ITM(A)
2.5
(dI/dt) c [T j ] / (dI/dt)c [Tj =125 °C]
2.0
10.00
1.5
1.0
1.00
Tj=125 °C
Tj max.:
Tj=25 °C
0.5
Vto = 0.85 V
VTM(V)
Tj (°C)
Rd = 300 mΩ
0.10
0.0
0.0
DS12893 - Rev 2
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
25
35
45
55
65
75
85
95
105
115
125
page 5/14
ACS108-8SN
Characteristics (curves)
Figure 11. Relative variation of static dV/dt immunity
versus junction temperature (typical values above 5
kV/µs)
5
dV/dt [ T j ] / dV/dt [ T j =125°C]
Figure 12. Relative variation of leakage current versus
junction temperature
1.0E+00
IDRM/IRRM [Tj;V DRM/ VRRM]/IDRM/IRRM [Tj=125°C;800 V]
VD =VR=536V
4
1.0E-01
VDRM=VRRM=800 V
3
VDRM=VRRM=600 V
2
1.0E-02
1
Tj (°C)
Tj (°C)
1.0E-03
0
25
50
75
100
Figure 13. Relative variation of critical rate of decrease of
main current (di/dt)c versus (dV/dt)c
5.0
(dI/dt) c [ (dV/dt) c ] / Specified(dI/dt ) c
50
75
100
125
Figure 14. Thermal resistance junction to ambient versus
copper surface under tab
140
Tj =125 °C
4.5
25
125
Rth(j-a) (°C/W)
Printed circuit board FR4
copper thickness = 35 µm
SOT-223
120
4.0
100
3.5
3.0
80
2.5
2.0
60
1.5
40
1.0
20
0.5
SCU(cm²)
(dV/dt) c (V/µs)
0
0.0
0.1
DS12893 - Rev 2
1.0
10.0
100.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
page 6/14
ACS108-8SN
Alternating current mains switch - basic application
2
Alternating current mains switch - basic application
The ACS108 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 15. Typical application schematic
Thanks to its overvoltage protection and turn-off commutation performance, the ACS108 switch can drive a small
power high inductive load with neither varistor nor additional turn-off snubber.
Figure 15. Typical application schematic
Lamp
Solenoid
Motor
M
AC Mains
OUT
Vss
MCU
ACS108
Rg = 220 Ohm
GATE
Vdd
COM
2.1
Protection against overvoltage: the best choice is ACS
In comparison with standard Triacs the ACS108 is over-voltage self-protected, as specified by the 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 16. Switching off of a high inductive load - typical clamping capability of ACS108 (Tamb = 25
°C), 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
DS12893 - Rev 2
page 7/14
ACS108-8SN
Protection against overvoltage: the best choice is ACS
designed for this purpose. When the energy has been dissipated, the ACS voltage falls back to the mains voltage
value (230 V rms, 50 Hz) ⑤.
Figure 16. Switching off of a high inductive load - typical clamping capability of ACS108 (Tamb = 25 °C)
2.1.2
Alternating current mains transient voltage ruggedness
The ACS108 switch is able to withstand safely the AC mains transients either by clamping the low energy spikes
or by breaking-over when subjected to high energy shocks, even with high turn-on current rises.
The test circuit shown in Figure 17. Overvoltage ruggedness test circuit for resistive and inductive loads, Tamb =
25 °C (conditions equivalent to IEC 61000-4-5 standard) is representative of the final ACS108 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 switch withstands the voltage spikes up to 2 kV above the peak mains voltage. The
protection is based on an overvoltage crowbar technology. Actually, the ACS108 breaks over safely as shown in
Figure 18. Typical current and voltage waveforms across the ACS108 (+2 kV surge, IEC 61000-4-5 standard).
The ACS108 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 mains voltage polarity.
DS12893 - Rev 2
page 8/14
ACS108-8SN
Protection against overvoltage: the best choice is ACS
Figure 17. Overvoltage ruggedness test circuit for resistive and inductive loads, Tamb = 25 °C (conditions
equivalent to IEC 61000-4-5 standard)
+ 2kV Surge generator
Rgenerator
Filtering unit
Cc
Model of the load
L = 5 μH
AC mains 230 V RMS, 50 Hz
R = 150 Ω
OUT
ACS108
GATE
Rg = 220 Ω
COM
Figure 18. Typical current and voltage waveforms across the ACS108 (+2 kV surge, IEC 61000-4-5
standard)
DS12893 - Rev 2
page 9/14
ACS108-8SN
Package information
3
Package information
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.
3.1
SOT-223 package information
•
•
Epoxy meets UL94, V0
Lead free plating + halogen-free molding resin
Figure 19. SOT-223 package outline
V
A
A1
c
B
e1
D
B1
4
H
E
1
2
3
e
DS12893 - Rev 2
page 10/14
ACS108-8SN
SOT-223 package information
Table 5. SOT-223 package mechanical data
Dimensions
Ref.
Inches(1)
Millimeters
Min.
Typ.
A
Max.
Min.
Typ.
1.80
A1
0.02
0.10
Max.
0.0709
0.0008
0.0039
B
0.60
0.70
0.85
0.024
0.0276
0.0335
B1
2.90
3.00
3.15
0.114
0.1181
0.1240
c
0.24
0.26
0.35
0.009
0.0102
0.0138
D
6.30
6.50
6.70
0.248
0.2559
0.2638
e
2.3
0.0906
e1
4.6
0.1811
E
3.30
3.50
3.70
0.130
0.1378
0.1457
H
6.70
7.00
7.30
0.264
0.2756
0.2874
V
10° max.
1. Inches only for reference
Figure 20. SOT-223 footprint (dimensions in mm)
3.25
1.32
5.16
7.80
1.32
2.30
DS12893 - Rev 2
0.95
page 11/14
ACS108-8SN
Ordering information
4
Ordering information
Figure 21. Ordering information scheme
ACS
1
08 - 8
S
N -TR
AC switch series
Number of switches
Current
08 = 0.8 A rms
Voltage
8 = 800 V
Gate current
S = 10 mA
Package
N = SOT-223
Packing
TR = Tape and reel 7 ” ( SOT-223, 1000 pieces)
Table 6. Ordering information
Order code
Marking
Package
Weight
Base qty.
Packing mode
ACS108-8SN-TR
ACS 108 8S(1)
SOT-223
0.11 g
1000
Tape and reel
1. first row = ACS, second row = 108, third row = 8S
DS12893 - Rev 2
page 12/14
ACS108-8SN
Revision history
Table 7. Document revision history
DS12893 - Rev 2
Date
Version
Changes
07-Feb-2019
1
Initial release.
08-Aug-2019
2
Updated Section Product status link / summary.
page 13/14
ACS108-8SN
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DS12893 - Rev 2
page 14/14
