ACST1235-8FP

## **ACST1235-8FP** 

## Overvoltage protected AC switch 

## − **Datasheet production data** 

## **Description** 

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G<br>OUT<br>COM<br>TO-220FPAB<br>(ACST1235-8FP)<br>L<br>**----- End of picture text -----**<br>


The ACST1235-8FP 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 12 A. **G** This ACST1235-8FP switch embeds a Triac **OUT** structure and a high voltage clamping device able **COM** to absorb the inductive turn-off energy and **TO-220FPAB** withstand line transients such as those described **(ACST1235-8FP)** in the IEC 61000-4-5 standard. It offers an extremely high static dV/dt immunity of 2 kV/μs minimum at 150 °C junction temperature. 

## **Features** 

ACST1235-8FP enables applications to be compliant with IEC 61000-4-4 and IEC 61000-4-5. 

- 12 A medium current AC Switch 

- Triac with self overvoltage protection 

- High static immunity and dynamic commutation 

- 800 V VDRM / VRRM 

- High junction temperature: Tj = 150 °C max 

- Complies with UL standards (File ref: E81734) 

- TO-220FPAB-insulated package 1500VRMS 

- ECOPACK[®] 2 and RoHs compliant component 

## **Applications** 

## **Figure 1. Functional diagram** 

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OUT<br>G<br>COM<br>**----- End of picture text -----**<br>


Motor control for home appliances: 

- Washing machine universal drum motors 

- Compressor of fridge or air conditioner 

**Table 1. Device summary** 

|**Symbol**|**Value**|**VDRM/VRRM**|
|---|---|---|
|**IT(RMS)**|12|A|
|**IGT**|35|mA|
|**VDRM/VRRM**|800|V|



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_www.st.com_ 

**Characteristics** 

**ACST1235-8FP** 

## **1 Characteristics** 

**Table 2. Absolute ratings (limiting values)** 

|**Symbol**|**Parameter**|**Test conditions**|**Test conditions**|**Value**|**Unit**|
|---|---|---|---|---|---|
|IT(RMS)|On-state rms current (full sine wave)|Tc= 97 °C||12|A|
|ITSM|Non repetitive surge peak on-state current<br>(Tjinitial = 25 °C)|tp= 16.7 ms||105|A|
|||tp= 20 ms||100||
|I2t|I2t value for fusing (full cycle sine wave)|tp= 10 ms||66|A²s|
|dI/dt|Critical rate of rise on-state current<br>IG= 2 x IGT,tr ≤100 ns|F = 60Hz|Tj= 150 °C|100|A/µs|
|VDRM/VRRM|Repetitive peak off-state voltage|Tj= 150 °C||800|V|
|VPP<br>(1)|Non repetitive line peak pulse voltage|Tj= 25 °C||2|kV|
|(dI/dt)BO<br>(1)|Non repetitive critical current rate of rise at breakover|Tj= 25 °C||150|A/µs|
|IGM|Peak gate current|tp= 20 µs|Tj= 150 °C|1|A|
|PGM|Peak gate power|tp= 20 µs|Tj= 150 °C|10|W|
|PG(AV)|Average gate power dissipation|Tj= 150 °C||0.1|W|
|Tstg|Storage junction temperature range|||-40 to +150|°C|
|Tj|Operating junction temperature range|||-40 to +150|°C|
|TL|Maximum lead temperature for soldering during 10 s|||260|°C|
|Vins(rms)|Insulation rms voltage (60 seconds)|||1.500|V|



1. according to test described by standard IEC 61000-4-5 (see _Figure 19_ ) 

**Table 3. Electrical characteristics** 

|**Symbol**|**Test conditions**|**Quadrant**|**Tj**|**Value**|**Value**|**Unit**|
|---|---|---|---|---|---|---|
|IGT|VD= 12 V, RL = 33Ω|I - II - III|25 °C|MAX.|35|mA|
|||||MIN.|1.75||
|VGT|VD= 12 V, RL = 33Ω|I - II - III|25 °C|MAX.|1.0|V|
|VGD|VD= VDRM,RL = 3.3 kΩ|I - II - III|150 °C|MIN.|0.2|V|
|IH<br>(1)|IT= 500 mA, gate open||25 °C|MAX.|30|mA|
|IL|IG= 1.2 x IGT|I - II - III|25 °C|MAX.|40|mA|
|dV/dt(1)|VD= 67% VDRM/VRRM, gate open||125 °C|MIN.|4000|V/µs|
||||150 °C|MIN.|2000||
|(dI/dt)c(1)|Without snubber||125 °C|MIN.|12|A/ms|
||(dI/dt)c = 15 V/µs||150 °C|MIN.|6||
|VCL|ICL= 0.1 mA, tp= 1 ms|||MIN.|850|V|



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

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**Characteristics** 

**Table 4. Static characteristics** 

|**Symbol**|**Test conditions**|**Val**|**ue**|**Unit**|
|---|---|---|---|---|
|VTM<br>(1)|ITM= 17 A, tp= 380 µs|Tj= 25 °C<br>MAX.|1.5|V|
|Vto<br>(1)|Threshold voltage|Tj= 150 °C<br>MAX.|0.9|V|
|Rd<br>(1)|Dynamic resistance|Tj= 150 °C<br>MAX.|38|mΩ|
|IDRM<br>IRRM|VOUT= VDRM/ VRRM|Tj= 25 °C<br>MAX.<br>Tj= 125 °C<br>Tj= 150 °C|1|µA|
||||500|µA|
||||1.2|mA|



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

**Table 5. Thermal characteristics** 

||**Table 5. Thermal characteristics**|||
|---|---|---|---|
|**Symbol**|**Parameter**|**Value**|**Unit**|
|Rth(j-c)|Junction to case (AC)|3.5<br>|°C/W|
|Rth(j-a)|Junction to ambient (AC)|60<br>|°C/W|



**Figure 2. Maximum power dissipation versus rms on-state current (full cycle)** 

**Figure 3. On-state rms current versus case temperature (full cycle)** 

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16 P(W) IT(RMS)(A)<br>14<br>α = 180 °<br>14 α = 180 °<br>12<br>12<br>10<br>10<br>8<br>8<br>6<br>6<br>4 180 ° 4<br>α<br>2 2<br>IT(RMS)(A) α TC(°C)<br>0 0<br>0 2 4 6 8 10 12 0 25 50 75 100 125 150<br>**----- End of picture text -----**<br>


**Figure 4. On-state rms current versus ambient temperature (free air convection)** 

**Figure 5. Relative variation of thermal impedance versus pulse duration** 

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3.0 IT(RMS)(A) 1.0E+00K = [Zth/Rth] Zth(j- c)<br>α = 180 ° Z th(j-a)<br>2.5<br>2.0<br>1.5 1.0E-01<br>1.0<br>0.5<br>0.0 Ta(°C) 1.0E-02 tp(s)<br>0 25 50 75 100 125 150 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03<br>**----- End of picture text -----**<br>


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**ACST1235-8FP** 

**Figure 6. On-state characteristics (maximum values)** 

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ITM(A)<br>100<br>V R to d T  = 38 m  = 0.9 V j max : Ω<br>10<br>T j = 150°C T j = 25°C<br>VTM(V)<br>1<br>0 1 2 3 4 5<br>**----- End of picture text -----**<br>


**Figure 7. Surge peak on-state current versus number of cycles** 

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IH,IL[Tj] / IH,IL[Tj = 25 °C]<br>2.5<br>2.0<br>1.5<br>1.0 I L<br>IH<br>0.5<br>T j  (°C)<br>0.0<br>-50 -25 0 25 50 75 100 125 150<br>**----- End of picture text -----**<br>


**Figure 8. Non repetitive surge peak on-state current for a sinusoidal pulse with width tp < 10 ms, and corresponding value of I²t** 

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ITSM(A), I t 2 (A s2 )<br>1000 Tj initial = 25 °C<br>dI/dt limitation: 100 A/μs ITSM<br>100<br>I²t<br>10<br>tp(ms)<br>1<br>0.01 0.10 1.00 10.00<br>**----- End of picture text -----**<br>


**Figure 9. Relative variation of gate trigger current and gate trigger voltage versus junction temperature (typical values)** 

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IGT,VGT[Tj] / IGT,VGT[Tj = 25 °C]<br>3.0<br>IGT Q3<br>2.5<br>IGT Q1- Q2<br>2.0<br>1.5<br>1.0<br>0.5 VGT Q1- Q2 - Q3<br>T j  (°C)<br>0.0<br>-50 -25 0 25 50 75 100 125 150<br>**----- End of picture text -----**<br>


**Figure 10. Relative variation of holding current and latching current versus junction temperature (typical values)** 

**Figure 11. Relative variation of critical rate of decrease of main current (dI/dt)c versus reapplied (dV/dt)c** 

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IH,IL[Tj] / IH,IL[Tj = 25 °C] (dI/dt)c [ (dV/dt)c ] / Specified (dI/dt)c<br>2.5 3<br>Tj =150 °C<br>2.0<br>2<br>1.5<br>1.0 I L<br>1<br>IH<br>0.5<br>Tj (°C) (dV/dt)c (V/µs)<br>0.0 0<br>-50 -25 0 25 50 75 100 125 150 0.1 1.0 10.0 100.0<br>**----- End of picture text -----**<br>


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**Characteristics** 

**Figure 12. Relative variation of critical rate of decrease of main current versus junction temperature (typical values)** 

## **Figure 13. Relative variation of static dV/dt immunity versus junction temperature** 

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10 (dI/dt)C [Tj] / (dI/dt)c [Tj=150 °C] 4 dV/dt [T j ] /dV/dt [T j = 150°C]<br>9 Device exceeding VD = VR = 536 V<br>8 dV/dt = 5 kV/μs<br>3<br>7<br>6<br>5 2<br>4<br>3<br>1<br>2<br>1 Tj(°C)<br>Tj(°C) 0<br>0<br>25 50 75 100 125 150<br>25 50 75 100 125 150<br>**----- End of picture text -----**<br>


**Figure 14. Relative variation of leakage current versus junction temperature for different values of blocking voltage (typical values)** 

**Figure 15. Relative variation of the maximum clamping voltage versus junction temperature (minimum values)** 

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IDRM / IRRM[Tj;VDRM / VRRM] / IDRM / IRRM 1.10 VCL[T] / Vj CL[T = 25 °C]j<br>1.0E+00<br>VDRM=VRRM = 800 V<br>1.05<br>1.0E-01 VDRM=VRRM = 600 V<br>1.00<br>1.0E-02 VDRM=VRRM = 400 V 0.95<br>1.0E-03<br>0.90<br>Tj ( ° C) Tj(°C)<br>1.0E-04 0.85<br>25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150<br>**----- End of picture text -----**<br>


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**ACST1235-8FP** 

**Application information** 

## **2 Application information** 

## **2.1 Typical application description** 

The ACST1235-8FP 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 ACST1235-8FP switch is able to drive an inductive load up to 12 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. 

## **Figure 16. AC induction motor control - typical diagram** 

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AC motor<br>AC induction<br>motor<br>AC mains<br>Phase shift capacitor +<br>protective air inductance<br>ACST ACST<br>Selection of the<br>rotor direction<br>Rg Rg<br>VCC<br>MCU<br>**----- End of picture text -----**<br>


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**Application information** 

**Figure 17. Universal drum motor control – typical diagram** 

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Universal motor<br>12 V<br>AC mains Motor direction<br>setting<br>MCU<br>Speed motor ACST<br>regulation<br>Rg<br>VCC<br>MCU<br>**----- End of picture text -----**<br>


The ACST1235-8FP device is also very effective in controlling resistive loads. 

**Figure 18. Resistive load control – typical diagram** 

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Lamp or<br>resistance<br>OUT<br>Variable<br>resistor<br>AC mains Diac G<br>Capacitor COM<br>**----- End of picture text -----**<br>


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**Application information** 

## **2.2 AC line transient voltage ruggedness** 

In comparison with standard Triac, which need additional protection components against surge voltage, the ACST1235-8FP is self-protected against overvoltage, specified by the new parameter VCL. The ACST1235-8FP switch can safely withstand AC line transient voltages either by clamping the low energy spikes, such as the inductive spikes at switchoff, 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 19_ represents the ACST1235-8FP 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 limits 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 ACST1235-8FP folds back safely to the on state as shown in _Figure 20_ . The ACST1235-8FP recovers its blocking voltage capability after the surge and the next zero crossing current. Such a non repetitive test can be done at least 10 times on each AC line voltage polarity. 

**Figure 19. Overvoltage ruggedness test circuit for resistive and inductive loads for IEC 61000-4-5 standards** 

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R = 11 Ω, L = 3 µH  V , PP = 2 kV<br>Rg = 62  Ω<br>2 kV surge<br>Rgene<br>Model of the load<br>Filtering unit R L<br>ACST<br>AC mains<br>Rg<br>**----- End of picture text -----**<br>


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**Application information** 

**Figure 20. Typical voltage and current waveforms across the ACST1235-8FP during IEC 61000-4-5 standard test** 

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Vpeak<br>1.2/50 µs voltage surge<br>0<br>V I<br>peak= 180 A<br>8/20 µs current surge<br>I<br>0<br>(dl/dt)BO = 150 A/µs<br>**----- End of picture text -----**<br>


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**Package information** 

## **3 Package information** 

- Lead-free package 

- Recommended torque: 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. 

## **Figure 21. TO-220FPAB dimension definitions** 

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A<br>H B<br>Dia<br>L6<br>L2 L7<br>L3<br>L5<br>D<br>F1<br>L4<br>F2<br>F<br>E<br>G1<br>G<br>**----- End of picture text -----**<br>


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**Package information** 

**Table 6. TO-220FPAB dimension values** 

||**Table 6. TO-220FPAB dimension values**|**Table 6. TO-220FPAB dimension values**|**Table 6. TO-220FPAB dimension values**|**Table 6. TO-220FPAB dimension values**|
|---|---|---|---|---|
|**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|



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**Ordering information** 

**ACST1235-8FP** 

## **4 Ordering information** 

## **Figure 22. Ordering information scheme** 

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ACS  T 12  35 -  8 FP<br>Series<br>AC switch<br>Topology<br>T = Triac<br>On-state rms current<br>12 = 12 A<br>Sensitivity<br>35 = 35 mA<br>Voltage<br>8 = 800 V<br>Package<br>FP = TO-220FPAB<br>**----- End of picture text -----**<br>


**Table 7. Ordering information** 

|**Order code**|**Marking**|**Package**|**Weight**|**Base qty**|**Packing mode**|
|---|---|---|---|---|---|
|ACST1235-8FP|ACST1235-8|TO-220FPAB|2.0 g|50|Tube|



## **5 Revision history** 

**Table 8. Document revision history** 

|**Date**|**Revision**|**Changes**|
|---|---|---|
|24-Apr-2014|1|First issue.|



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