ACST435-8BTR - STMicroelectronics, Inc.

December 2009 Doc ID 8766 Rev 5 1/13

ACST4

Overvoltage protected AC switch

Features

■Triac with overvoltage protection

■Low IGT (<10 mA) or high immunity

(IGT<35 mA) version

■High noise immunity: static dV/dt > 1000 V/µs

■TO-220FPAB insulated package: 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 the power passive component count

■High immunity against fast transients

described in IEC 61000-4-4 standards

Applications

■AC mains static switching in appliance and

industrial control systems

■Drive of medium power AC loads such as:

– Universal motor of washing machine drum

– Compressor for fridge or air conditioner

Description

The ACST4 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 4 A.

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

only a low gate current to be activated (IGT < 10

mA) and still shows a high 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) 4A

VDRM/VRRM 800 V

IGT (ACST410) 10 mA

IGT (ACST435) 35 mA

OUT

COM

TO-220FPAB

ACST410-8FP

ACST435-8FP

DPAK

ACST410-8B

ACST435-8B

OUT

COM

OUT

www.st.com

Characteristics ASCT4

2/13 Doc ID 8766 Rev 5

1 Characteristics

Table 2. Absolute ratings (limiting values)

Symbol Parameter Value Unit

IT(RMS) On-state rms current (full sine wave)

TO-220FPAB Tc = 102 °C 4

DPAK Tc = 112 °C

DPAK with

0.5 cm2 copper Tamb = 60 °C 1

ITSM

Non repetitive surge peak on-state current

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

F = 60 Hz tp = 16.7 ms 32 A

F = 50 Hz tp = 20 ms 30 A

I2tI

2t for fuse selection tp = 10 ms 6 A2s

dI/dt Critical rate of rise on-state current

IG = 2 x IGT, (tr ≤ 100 ns) F = 120 Hz Tj = 125 °C 100 A/µs

VPP Non repetitive line peak pulse 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 temperature range -40 to +150 °C

Tj Operating junction temperature range -40 to +125 °C

Tl Maximum lead solder temperature during 10 ms (at 3 mm from plastic case) 260 °C

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

1. According to test described in IEC 61000-4-5 standard and Figure 19.

Table 3. Electrical characteristics

Symbol Test conditions Quadrant TjACST410 ACST435 Unit

IGT(1) VOUT = 12 V, RL = 33 ΩI - II - III 25 °C MAX. 10 35 mA

VGT VOUT = 12 V, RL = 33 ΩI - II - III 25 °C MAX. 1.0 1.1 V

VGD VOUT = VDRM, RL = 3.3 kΩI - II - III 125 °C MIN. 0.2 V

IH(2) IOUT = 500 mA 25 °C MAX. 20 25 mA

ILIG = 1.2 x IGT I - II - III 25 °C MAX. 40 60 mA

dV/dt (2) VOUT = 67 % VDRM, gate open 125 °C MIN. 500 1000 V/µs

(dI/dt)c(2) Without snubber 125 °C MIN. 5 A/ms

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

VCL ICL = 0.1 mA, tp = 1 ms 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

ASCT4 Characteristics

Doc ID 8766 Rev 5 3/13

Table 4. Static characteristics

Symbol Test conditions Value Unit

VTM(1)

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

IOUT = 5.6 A, tp = 500 µs Tj = 25 °C MAX. 1.7 V

VT0(1) Threshold voltage Tj = 125 °C MAX. 0.9 V

Rd(1) Dynamic resistance Tj = 125 °C MAX. 110 mΩ

IDRM

IRRM VOUT = VDRM/ VRRM

Tj = 25 °C MAX. 20 µA

Tj = 125 °C MAX. 500 µA

Table 5. Thermal resistances

Symbol Parameter Value Unit

Rth(j-a)

Junction to ambient TO-220FPAB 60 °C/W

Junction to ambient (soldered on 0.5 cm2 copper pad) DPAK 70

Rth(j-c) Junction to case for full cycle sine wave conduction TO-220FPAB 4.6 °C/W

DPAK 2.6

Figure 2. Maximum power dissipation versus

on-state rms current

Figure 3. On-state rms current versus case

temperature (full cycle)

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

180°

α= 180°

P(W)

IT(RMS)(A)

0 25 50 75 100 125

α=180°

TO220FPAB

DPAK

TC(°C)

Characteristics ASCT4

4/13 Doc ID 8766 Rev 5

Figure 4. On-state rms current versus

ambient temperature (free air

convection, full cycle)

Figure 5. Relative variation of thermal

impedance versus pulse duration

Figure 6. Relative variation of gate trigger

current (IGT) and voltage (VGT)

versus junction temperature

Figure 7. Relative variation of holding

current (IH) and latching current (IL)

versus junction temperature

Figure 8. Surge peak on-state current

versus number of cycles

Figure 9. Non repetitive surge peak on-state

current and corresponding value of

I2t versus sinusoidal pulse width

IT(RMS)(A)

0.0

0.5

1.0

1.5

2.0

0 25 50 75 100 125

α=180°

TO-220FPAB

DPAK with copper

surface = 0.5 cm

Ta(°C)

K = [Zth / Rth]

1.0E-02

1.0E-01

1.0E+00

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

th(j-a)

th(j-c)

TO-220FPAB

DPAK

Tp(s)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

-50 -25 0 25 50 75 100 125

IGT Q3

IGT Q1-Q2

V Q1-Q2-Q3

IGT,V

GT[Tj] / IGT,V

GT[Tj= 25 °C]

(typical values)

Tj(°C)

0.0

0.5

1.0

1.5

2.0

2.5

-50 -25 0 25 50 75 100 125

IH,I

L[Tj] / IH,I

L[Tj= 25 °C]

Tj(°C)

(typical values)

ITSM(A)

1 10 100 1000

Non repetitive

initial=25 °C

One cycle

t=20ms

Repetitive

=102°C

Number of cycles

100

1000

0.01 0.10 1.00 10.00

t (ms)

ITSM(A), I²t (A²s)

dl /dt limitation: 100 A / µs Tjinitial = 25 °C

ITSM

I²t

ASCT4 Characteristics

Doc ID 8766 Rev 5 5/13

Figure 10. On-state characteristics

(maximum values)

Figure 11. Relative variation of critical rate of

decrease of main current (dI/dt)c

versus junction temperature

100

012345

Tj= 125 °C

Tj= 25 °C

ITM(A)

VTM(V)

Tjmax:

Vto = 0.90 V

Rd= 110 mΩ

25 50 75 100 125

Tj(°C)

(dI/dt)c[Tj] / (dl/dt)c[Tj= 125 °C]

Figure 12. Relative variation of static dV/dt

immunity versus junction

temperature (gate open)

Figure 13. Relative variation of leakage

current versus junction

temperature

25 50 75 100 125

dV/dt [Tj] / dV/dt [Tj= 125 °C]

VD=V

R= 536 V

Tj(°C)

25 50 75 100 125

VDRM =V

RRM = 800V

VDRM =V

RRM = 600 V

VDRM =V

RRM = 200 V

IDRM/IRRM [Tj;V

DRM /V

RRM] / IDRM/IRRM [Tj= 125 °C; 800 V]

1.0E-03

1.0E-02

1.0E-01

1.0E+00

Tj(°C)

Different blocking voltages

Figure 14. Relative variation of the clamping

voltage (VCL) versus junction

temperature (minimum values)

Figure 15. Thermal resistance junction to

ambient versus copper surface

under tab

0.85

0.90

0.95

1.00

1.05

1.10

1.15

-50 -25 0 25 50 75 100 125

V[T

j] / V [Tj= 25 °C]

CL CL

Tj(°C)

100

0 5 10 15 20 25 30 35 40

Rth(j-a)(°C/W)

DPAK

SCU

(cm²)

Printed circuit board FR4,

copper thickness = 35 µm

Application information ASCT4

6/13 Doc ID 8766 Rev 5

2 Application information

2.1 Typical application description

The ACST4 device has been designed to control medium power load, such as AC motors in

home appliances. Thanks to its thermal and turn off commutation performances, the ACST4

switch is able to drive an inductive load up to 4 A with no turn off additional snubber. It also

provides high thermal performances in static and transient modes such as the compressor

inrush current or high torque operating conditions of an AC motor. Thanks to its low gate

triggering current level, the ACST4 can be driven directly by an MCU through a simple gate

resistor as shown Figure 16 and Figure 17.

Figure 16. Compressor control – typical diagrams

Compressor

Electronic

starter

Electronic

thermostat

ACST

Power supply

AC Mains

Gate

Driver

logical circuitry

PTC

Compressor with integrated e-starter

Compressor

Start

switch

Run

switch

PTC

ACST

Power supply

Gate

Driver

ACST

AC Mains

Compressor with external electronic drive

ASCT4 Application information

Doc ID 8766 Rev 5 7/13

Figure 17. Universal drum motor control – typical diagram

2.2 AC line transient voltage ruggedness

In comparison with standard Triacs, which are not robust against surge voltage, the ACST4

is self-protected against over-voltage, specified by the new parameter VCL. The ACST4

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 18 represents the ACST4 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 ACST4 folds back safely to the on state as shown in Figure 19. The ACST4

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.

Universal motor

Motor direction

setting

Speed motor

regulation

AC Mains

Stator

MCU

Vcc

12V

ACST

Rotor

MCU

Application information ASCT4

8/13 Doc ID 8766 Rev 5

Figure 18. Overvoltage ruggedness test circuit for resistive and inductive loads for

IEC 61000-4-5 standards

Figure 19. Typical current and voltage waveforms across the ACST4 during

IEC 61000-4-5 standard test

AC Mains

Filtering unit

Model of the load

Rgene

Surge generator

ACST4

2kV surge

R = 23 , L = 2 µH, Vsurge = 2 kV

Rg = 220 (ACST410-8), 68 (ACST435-8)

ΩΩ

Vpeak =V

1.2/50 µs voltage surge

8/20 µs current surge

Ipeak = 90 A

dI/dt = 130 A/µs

ASCT4 Ordering information scheme

Doc ID 8766 Rev 5 9/13

3 Ordering information scheme

Figure 20. Ordering information scheme

ACS T 4 10 - 8 B TR

AC switch

Topology

On-state rms current

Repetitive peak off-state voltage

Package

T = Triac

4 = 4 A

8 = 800V

TR = Tape and reel

Blank = Tube

Triggering gate current

Delivery mode

10 = 10 mA

35 = 35 mA

B = DPAK

FP = TO-220FPAB

Package information ASCT4

10/13 Doc ID 8766 Rev 5

4 Package information

●Epoxy meets UL94, V0

●Cooling method: by conduction (C)

●Recommended torque value(TO220FPAB): 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 1.50 0.045 0.059

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

ASCT4 Package information

Doc ID 8766 Rev 5 11/13

Figure 21. 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 ASCT4

12/13 Doc ID 8766 Rev 5

5 Ordering information

Table 8. Ordering information

6 Revision history

Table 9. Document revision history

Order code Marking Package Weight Base Qty Delivery mode

ACST410-8B

ACST4108

DPAK 1.5 g 50 Tube

ACST410-8BTR DPAK 1.5 g 1000 Tape and reel

ACST410-8FP TO-220FPAB 2.4 g 50 Tube

ACST435-8B

ACST4358

DPAK 1.5 g 50 Tube

ACST435-8BTR DPAK 1.5 g 1000 Tape and reel

ACST435-8FP TO-220FPAB 2.4 g 50 Tube

Date Revision Changes

Jan-2003 3A Previous update.

04-Jul-2007 4 Reformatted to current standard. Added package.

18-Dec-2009 5 VDRM/VRRM updated to 800 V. Order codes updated.

ASCT4

Doc ID 8766 Rev 5 13/13

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