ACST210-8BTR - STMicroelectronics

July 2010 Doc ID 13304 Rev 3 1/13

ACST2

Overvoltage protected AC switch

Features

■Triac with overvoltage crowbar technology

■High noise immunity: static dV/dt > 500 V/µs

■ACST210-8FP, in the TO-220FPAB package,

provides insulation voltage rated at 1500 V rms

Benefits

■Enables equipment to meet IEC 61000-4-5

■High off-state reliability with planar technology

■Needs no external overvoltage protection

■Reduces component count

■Interfaces directly with the micro-controller

■High immunity against fast transients

described in IEC 61000-4-4 standards

Applications

■AC on/off static switching in appliances and

industrial control systems

■Driving low power highly inductive loads like

solenoid, pump, fan, and micro-motor

Description

The ACST2 series belongs to the ACS™/ACST

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 2 A.

This ACST2 switch embeds a Triac structure with

a high voltage clamping device to absorb the

inductive turn-off energy and withstand line

transients such as those described in the

IEC 61000-4-5 standards. The component needs

a low gate current to be activated (IGT < 10 mA)

and still shows a high electrical noise immunity

complying with IEC standards such as

IEC 61000-4-4 (fast transient burst test).

Figure 1. Functional diagram

TM: ACS is a trademark of STMicroelectronics

®: A.S.D. is a registered trademark of

STMicroelectronics

Table 1. Device summary

Symbol Value Unit

IT(RMS) 2A

VDRM/VRRM 800 V

IGT 10 mA

COM

OUT

TO-220FPAB

ACST210-8FP

DPAK

ACST210-8B

COM

OUT

www.st.com

Characteristics ACST2

2/13 Doc ID 13304 Rev 3

1 Characteristics

Table 2. Absolute maximum ratings (limiting values)

Symbol Parameter Value Unit

IT(RMS) On-state rms current (full sine wave) TO-220FPAB Tc = 105 °C 2A

DPAK Tc = 110 °C

ITSM

Non repetitive surge peak on-state current

(full cycle sine wave, TJ initial = 25 °C)

F = 60 Hz t = 16.7 ms 8.4 A

F = 50 Hz t = 20 ms 8.0

I²tI

²t Value for fusing tp = 10 ms 0.5 A²s

dI/dt Critical rate of rise of on-state current

IG = 2 x IGT

, tr = 100 ns F = 120 Hz Tj = 125 °C 50 A/µs

VPP (1) Non repetitive line peak mains voltage (1) Tj = 25 °C 2 kV

PG(AV) Average gate power dissipation Tj = 125 °C 0.1 W

PGM Peak gate power dissipation (tp = 20 µs) Tj = 125 °C 10 W

IGM Peak gate current (tp = 20 µs) Tj = 125 °C 1.6 A

Tstg

Storage junction temperature range

Operating junction temperature range

-40 to +150

-40 to +125 °C

TlMaximum lead soldering temperature during 10 s (at 3 mm from plastic case) 260 °C

VINS(RMS) Insulation rms voltage T0-220FPAB 1500 V

1. According to test described in IEC 61000-4-5 standard and Figure 18

Table 3. Electrical characteristics (Tj = 25 °C, unless otherwise specified)

Symbol Test conditions Quadrant Value Unit

IGT(1) VOUT = 12 V, RL = 33 ΩI - II - III MAX 10 mA

VGT VOUT = 12 V, RL = 33 ΩI - II - III MAX 1.1 V

VGD VOUT = VDRM, RL = 3.3 kΩ,Tj = 125 °C I - II - III MIN 0.2 V

IH (2) IOUT = 100 mA MAX 10 mA

ILIG = 1.2 x IGT

I - III MAX 25 mA

II MAX 35

dV/dt (2) VOUT = 67% VDRM gate open, Tj = 125 °C MIN 500 V/µs

(dI/dt)c (2) (dV/dt)c = 15 V/µs, Tj = 125 °C MIN 0.5 A/ms

VCL ICL = 0.1 mA, tp = 1 ms, Tj = 25 °C MIN 850 V

1. Minimum IGT is guaranteed at 5% of IGT max

2. For both polarities of OUT pin referenced to COM pin

ACST2 Characteristics

Doc ID 13304 Rev 3 3/13

Table 4. Static electrical characteristics

Symbol Test conditions Value Unit

VTM(1) ITM = 2.8 A, tp = 500 µs Tj = 25 °C MAX 2 V

VTO(1) Threshold voltage Tj = 125 °C MAX 0.9 V

RD(1) Dynamic resistance Tj = 125 °C MAX 250 mΩ

IDRM

IRRM

VOUT = VDRM / VRRM

Tj = 25 °C MAX 10 µA

Tj = 125 °C 0.5 mA

1. For both polarities of OUT pin referenced to COM pin

Table 5. Thermal resistances

Symbol Parameter Value Unit

Rth(j-c) Junction to case (AC) DPAK 4.5

°C/W

TO-220FPAB 7

Rth(j-a) Junction to ambient TO-220FPAB 60

SCU (1)= 0.5 cm²DPAK 70

1. SCU = copper surface under tab

Figure 2. Maximum power dissipation versus

on-state rms current (full cycle)

Figure 3. On-state rms current versus case

temperature

0.0

0.4

0.8

1.2

1.6

2.0

2.4

2.8

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

P(W)

α=180 °

180°

IT(RMS)(A)

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

0 25 50 75 100 125

T(RMS)

(

)

α=180 °

DPAK

TO-220FPAB

TC(°C)

Characteristics ACST2

4/13 Doc ID 13304 Rev 3

Figure 4. On-state rms current versus

ambient temperature

Figure 5. Relative variation of thermal

impedance versus pulse duration

TO-220FPAB

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0 25 50 75 100 125

T(RMS)

(A)

α=180 °

Printed circuit board FR4

Natural convection

SCU=0.5 cm²

Tamb(°C)

0.01

0.10

1.00

1.0E-04 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03

K=[Z

]

Zth(j-a)

Zth(j-c)

TO-220FPAB

tP(s)

Figure 6. Relative variation of thermal

impedance versus pulse duration

DPAK

Figure 7. Relative variation of gate trigger,

holding and latching current versus

junction temperature

1.0E-02

1.0E-01

1.0E+00

1.0E-04 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03

K=[Z

]

Zth(j-a)

Zth(j-c)

DPAK

tP(s)

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

=25 °C]

& I

(°C)

Typical values

Figure 8. Relative variation of static dV/dt

versus junction temperature

Figure 9. Relative variation of critical rate of

decrease of main current versus

reapplied dV/dt (typical values)

100

25 50 75 100 125

dV/dt [T

]/dV/dt[T

=125 °C]

VOUT=540 V

Tj(°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 1.0 10.0 100.0

(dI/dt)

[(dV/dt)

] / Specified (dI/dt)

VOUT=300 V

(dV/dt)c(V/µs)

ACST2 Characteristics

Doc ID 13304 Rev 3 5/13

Figure 10. Relative variation of critical rate of

decrease of main current versus

junction temperature

Figure 11. Surge peak on-state current versus

number of cycles

25 50 75 100 125

(dI/dt)

]/(dI/dt)

=125 °C]

VOUT=300 V

Tj(°C)

1 10 100 1000

TSM

(A)

Non repetitive

Tjinitial=25 °C

Repetitive

TC=110 °C

One cycle

t=20ms

Number of cycles

Figure 12. Non repetitive surge peak on-state

current and corresponding value

of I²t

Figure 13. On-state characteristics (maximum

values)

0.1

1.0

10.0

100.0

0.01 0.10 1.00 10.00

TSM

(A), I²t (A²s)

initial=25 °C

TSM

I²t

(ms)

sinusoidal pulse

with width t < 10 ms

1.E-02

1.E-01

1.E+00

1.E+01

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

(A)

TJmax. :

VTO= 0.90 V

RD= 250 mW

Tj=25 °C

Tj=125 °C

VTM(V)

Figure 14. Thermal resistance junction to

ambient versus copper surface

under tab DPAK

Figure 15. Relative variation of clamping

voltage VCL versus junction

temperature

100

0 5 10 15 20 25 30 35 40

th(j-a)

(°C/W)

DPAK

CU(cm²)

printed circuit board FR4,

copper thickness = 35 µm

0.85

0.90

0.95

1.00

1.05

1.10

1.15

1.20

-40 -20 0 20 40 60 80 100 120 140

]/V

=25 °C]

Tj(°C)

Application information ACST2

6/13 Doc ID 13304 Rev 3

2 Application information

2.1 Typical application description

The ACST2 device has been designed to switch on and off highly inductive or resistive loads

such as pump, valve, fan, or bulb lamp. Thanks to its high sensitivity (IGT max = 10 mA), the

ACST2 can be driven directly by logic level circuits through a resistor as shown on the

typical application diagram. Thanks to its thermal and turn-off commutation performances,

the ACST2 switch can drive, without any additional snubber, an inductive load up to 2 A.

Figure 16. AC induction motor control – typical diagram

AC LOAD

MCU

Line

Power supply

AC Mains R

ACST2

ACST2 Application information

Doc ID 13304 Rev 3 7/13

2.2 AC line transient voltage ruggedness

In comparison with standard Triacs, which are not robust against surge voltage, the ACST2

is self-protected against over-voltage, specified by the new parameter VCL. In addition, the

ACST2 is a sensitive device (IGT = 10 ma), but provides a high noise immunity level againast

fast transients. The ACST2 switch can safely withstand AC line transient voltages either by

clamping the low energy spikes, such as inductive spikes at switch off, or by switching to the

on state (for less than 10 ms) to dissipate higher energy shocks through the load. This safety

feature works even with high turn-on current ramp up.

The test circuit of Figure 17 represents the ACST2 application, and is used to stress the

ACST switch according to the IEC 61000-4-5 standard conditions. With the additional effect

of the load which is limiting the current, the ACST switch withstands the voltage spikes up to

2 kV on top of the peak line voltage. The protection is based on an overvoltage crowbar

technology. The ACST2 folds back safely to the on state as shown in Figure 18. The ACST2

recovers its blocking voltage capability after the surge and the next zero current crossing.

Such a non repetitive test can be done at least 10 times on each AC line voltage polarity.

Figure 17. Overvoltage ruggedness test circuit for resistive and inductive loads for

IEC 61000-4-5 standards

C Mains

Filtering unit

Model of the load

Rgene

Surge generator

ACST210-8x

2kV surge

R = 20 , L = 10 µH, VPP = 2 kVΩ

Application information ACST2

8/13 Doc ID 13304 Rev 3

Figure 18. Typical current and voltage waveforms across the ACST2 during

IEC 61000-4-5 standard test

2.3 Electrical noise immunity

The ACST2 is a sensitive device (IGT = 10 mA) and can be controlled directly though a

simple resistor by a logic level circuit, and still provides a high electrical noise immunity. The

intrinsic immunity of the ACST2 is shown by the specified dV/dt equal to 500 V/µs @ 125 °C.

This immunity level is 5 to 10 times higher than the immunity provided by an equivalent

standard technology Triac with the same sensitivity. In other words, the ACST2 is sensitive,

but has an immunity usually available only for non-sensitive device (IGT higher than 35 mA).

Vpeak =V CL

1.2/50 µs voltage surge

8/20 µs current surge

ACST2 Ordering information scheme

Doc ID 13304 Rev 3 9/13

3 Ordering information scheme

Figure 19. Ordering information scheme

ACS T 2 10 - 8 B TR

AC switch

Topology

On-state rms current

Sensitivity

Voltage

Package

Delivery mode

T = Triac

2 = 2 A

10 = 10 mA

8 = 800 V

FP = TO-220FPAB

B = DPAK

TR = Tape and reel (DPAK)

Blank = Tube (TO-220FPAB, DPAK)

Package information ACST2

10/13 Doc ID 13304 Rev 3

4 Package information

●Epoxy meets UL94, V0

●Recommended torque (TO-220FPAB): 0.4 to 0.6 N·m

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.

Table 6. TO-220FPAB dimensions

Ref.

Dimensions

Millimeters Inches

Min. Max. Min. Max.

A 4.4 4.6 0.173 0.181

B 2.5 2.7 0.098 0.106

D 2.5 2.75 0.098 0.108

E 0.45 0.70 0.018 0.027

F 0.75 1 0.030 0.039

F1 1.15 1.70 0.045 0.067

F2 1.15 1.70 0.045 0.067

G 4.95 5.20 0.195 0.205

G1 2.4 2.7 0.094 0.106

H 10 10.4 0.393 0.409

L2 16 Typ. 0.63 Typ.

L3 28.6 30.6 1.126 1.205

L4 9.8 10.6 0.386 0.417

L5 2.9 3.6 0.114 0.142

L6 15.9 16.4 0.626 0.646

L7 9.00 9.30 0.354 0.366

Dia. 3.00 3.20 0.118 0.126

Dia

ACST2 Package information

Doc ID 13304 Rev 3 11/13

Figure 20. Footprint (dimensions in mm)

Table 7. DPAK dimensions

Ref.

Dimensions

Millimeters Inches

Min. Max. Min. Max.

A 2.20 2.40 0.086 0.094

A1 0.90 1.10 0.035 0.043

A2 0.03 0.23 0.001 0.009

B 0.64 0.90 0.025 0.035

B2 5.20 5.40 0.204 0.212

C 0.45 0.60 0.017 0.023

C2 0.48 0.60 0.018 0.023

D 6.00 6.20 0.236 0.244

E 6.40 6.60 0.251 0.259

G 4.40 4.60 0.173 0.181

H 9.35 10.10 0.368 0.397

L2 0.80 typ. 0.031 typ.

L4 0.60 1.00 0.023 0.039

V2 0° 8° 0° 8°

0.60 MIN.

6.7

6.7 3 3 1.6

1.6

2.3

Ordering information ACST2

12/13 Doc ID 13304 Rev 3

5 Ordering information

6 Revision history

Table 8. Ordering information

Order code Marking Package Weight Base Qty Packing mode

ACST210-8FP

ACST2108

TO-220FPAB 2.4g 50 Tube

ACST210-8B DPAK 0.3g 50 Tube

ACST210-8B-TR DPAK 0.3g 2500 Tape and Reel

Table 9. Document revision history

Date Revision Changes

01-Mar-2007 1 Initial release.

13-Apr-2010 2 Updated ECOPACK statement. Reformatted for consistency with

other datasheets in this product class.

01-Jul-2010 3 Updated Figure 19.

ACST2

Doc ID 13304 Rev 3 13/13

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