ACS108-8TN-TR

## **ACS108-8TN** 

## Overvoltage protected AC switch (ACS[TM] ) 

Datasheet - production data 

## **Description** 

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CO M<br>G<br>CO M<br>OU T<br>SOT-223<br>**----- End of picture text -----**<br>


The ACS108-8TN 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. 

The ACS108-8TN 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. 

**Figure 1: Functional diagram** 

## **Features** 

- 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 

- Interfaces directly with the microcontroller ECOPACK[®] 2 and RoHS compliant component 

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OUT<br>G<br>COM<br>COM Common drive reference to connect<br>to the mains<br>OUT Output to connect to the load.<br>G Gate input to connect to the controller<br>through gate resistor<br>**----- End of picture text -----**<br>


## **Applications** 

- 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 

**Table 1: Device summary** 

|**Symbol**|**Value**|
|---|---|
|IT(RMS)|0.8 A|
|VDRM/VRRM|800 V|
|IGT|5 mA|



- lamp 

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This is information on a product in full production. 

_www.st.com_ 

**Characteristics** 

**ACS108-8TN** 

## **1 Characteristics** 

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

|**Symbol**|**Parameter**|**Parameter**|**Parameter**|**Value**|**Unit**|
|---|---|---|---|---|---|
|IT(RMS)|RMS on-state current<br>(180 ° conduction angle)||Ttab= 104 °C|0.8|A|
|ITSM|Non repetitive surge peak<br>on-state current|tp= 16.7 ms|Tjinitial = 25 °C|13.7|A|
|||tp= 20 ms||13||
|I2t|I2t value for fusing|tp= 10 ms|Tj= 25 °C|1.1|A2s|
|VRRM/<br>VDRM|Repetitive peak off-state voltage||Tj= 125 °C|800|V|
|dl/dt|Critical rate of rise of<br>on-state current|IG= 2 x IGT,<br>tr ≤ 100 ns|f = 120 Hz|100|A/µs|
|Vpp_(1)_|Non repetitivepeakpulse line voltage||Tj= 25 °C|2|kV|
|IGM|Peakgate current|tp= 20µs|Tj= 125 °C|1|A|
|VGM|Peakpositivegate voltage||Tj= 125 °C|10|V|
|PG(AV)|Averagegatepower dissipation||Tj= 125 °C|0.1|W|
|Tstg|Storagejunction temperature range|||-40 to +150|°C|
|Tj|Maximum operating junction temperature range|||-40 to +125|°C|



## **Notes:** 

> (1)According to test described by IEC 61000-4-5 standard and test per _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 Ω|II - III|Max.|5|mA|
|VGT||II - III|Max.|1|V|
|VGD|VOUT= VDRM, RL= 3.3 kΩ, Tj= 125 °C|II - III|Min.|0.15|V|
|IH|IT= 100 mA,gate open||Max.|10|mA|
|IL|IG= 1.2 x IGT||Max.|20|mA|
|dV/dt|VD= 402 V,gate open, Tj= 125 °C||Max.|600|V/µs|
||VD= 536 V,gate open, Tj= 125 °C|||300||
|(dl/dt)c|(dl/dt)c < 15 V/µs, turn-off time ≤ 20 ms, Tj= 125 °C||Min.|0.8|A/ms|
|VCL|ICL= 1 mA, tp= 1 ms, Tj= 125 °C||Min.|850|V|



## **Notes:** 

(1)Minimum IGT is guaranteed at 10% of IGT max. 

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**Characteristics** 

**Table 4: Static electrical characteristics** 

|**Symbol**|**Test conditions**|||**Value**|**Unit**|
|---|---|---|---|---|---|
|VTM_(1)_|ITM= 1.1 A, tp= 380µs|Tj= 25 °C|Max.|1.3|V|
|Vto|Threshold voltage|Tj= 125 °C|Max.|0.85|V|
|RD|Dynamic resistance|Tj= 125 °C|Max.|350|mΩ|
|IDRM|VOUT= VDRM= VRRM|Tj= 25 °C|Max.|2|µA|
|IRRM||Tj= 125 °C||0.2|mA|



**Notes:** 

(1)For both polarities 

**Table 5: Thermal resistance** 

|**Symbol**|**Parameter**||**Value**|**Unit**|
|---|---|---|---|---|
|Rth(j-t)|Junction to tab (AC)|Max.|25|°C/W|
|Rth(j-a)|Junction to ambient (Scu= 5 cm2)|Typ.|60||



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## **Characteristics** 

## **1.1 Characteristics (curves)** 

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Figure 2: Maximum power dissipation versus   Figure 3: On-state RMS current versus tab<br>on-state RMS current  temperature (full cycle)<br>1.0 P(W) 1.0 IT(RMS)(A)<br>α = 180° α = 180 °<br>0.8 0.8<br>0.6 0.6<br>0.4 0.4<br>0.2 180 ° 0.2<br>IT(RMS)(A) TTAB(°C)<br>0.0 0.0<br>0.0 0.2 0.4 0.6 0.8 0 25 50 75 100 125<br>**----- End of picture text -----**<br>


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Figure 4: On state RMS current versus ambient  Figure 5: Relative variation of thermal impedance<br>temperature (free air, full cycle)  versus pulse duration<br>1.0 IT(RMS)(A) 1.00 K = [Zth/Rth]<br>α = 180°<br>Z th(j-t) Z th(j-a)<br>0.8<br>0.6<br>0.10<br>0.4<br>0.2<br>TA(°C) tp(s)<br>0.0 0.01<br>0 25 50 75 100 125 1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03<br>Figure 6: Relative variation of holding current IH Figure 7: Relative variation of gate triggering<br>and latching current IL versus junction temperature  current IGT and gate triggering voltage VGT versus<br>junction temperature<br>2.5 IH, IL[Tj] / IH, IL[Tj = 25 °C] 3.0 IGT, VGT[Tj]/IGT, VGT[Tj = 25 °C]<br>IGT Q2<br>2.5<br>2.0<br>IL 2.0 IGT Q3<br>1.5<br>1.5<br>1.0 I H<br>1.0<br>VGT Q2-Q3<br>0.5<br>0.5<br>0.0 Tj (°C) 0.0 Tj (°C)<br>-40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140<br>**----- End of picture text -----**<br>


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**Characteristics** 

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Figure 8: Surge peak on-state current versus  Figure 9: Non repetitive surge peak on-state<br>number of cycles  current for a sinusoidal pulse versus pulse width<br>ITSM(A) ITSM(A)<br>15 1.E+03<br>Tj initial = 25 °C<br>t = 20ms<br>One cycle<br>10 1.E+02 I TSM<br>T Non repetitivej initial = 25 °C<br>5 T TABRepetitive = 104 °C 1.E+01<br>Number of cycles tp(ms)<br>0 1.E+00<br>1 10 100 1000 0.01 0.10 1.00 10.00<br>**----- End of picture text -----**<br>


**Figure 10: On-state characteristics (maximum values)** 

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Figure 11: Relative variation of critical rate of<br>decrease of main current (dI/dt)c versus junction<br>temperature<br>(dl/dt)c [Tj] / (dl/dt)c [Tj = 125 °C]<br>15<br>10<br>5<br>T j (°C)<br>0<br>25 35 45 55 65 75 85 95 105 115 125<br>**----- End of picture text -----**<br>


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Figure 12: Relative variation of critical rate of  Figure 13: Relative variation of static dV/dt<br>decrease of main current (dI/dt)c versus reapplied  immunity versus junction temperature<br>(dV/dt)c  (typical values)<br>4 (dI/dt)c [ (dV/dt)c ] / Specified (dI/dt)c 10 dV/dt [Tj ] / dV/dt [Tj = 125 °C]<br>T j = 125 °C 9 VD= VR= 536 V<br>8<br>3<br>7<br>6<br>2 5<br>4<br>3<br>1<br>2<br>1<br>0 (dV/dt)c (V/µs) 0 Tj (°C)<br>0.1 1.0 10.0 100.0 25 50 75 100 125<br>**----- End of picture text -----**<br>


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**Characteristics** 

**ACS108-8TN** 

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Figure 14: Relative variation of Leakage current  Figure 15: Thermal resistance junction to ambient<br>versus junction temperature  versus copper surface under tab<br>IDRM/IRRM [Tj; VDRM/VRRM] / IDRM/IRRM[Tj = 125 °C; 800 V] Rth(j-a)(°C/W)<br>1.E+00 120<br>SOT-223<br>VDRM = VRRM = 800 V<br>100<br>1.E-01 80<br>60<br>1.E-02 Tj (°C) 40 SCu(cm [2] )<br>25 50 75 100 125 0 1 2 3 4 5<br>**----- End of picture text -----**<br>


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**Alternating** current mains switch - basic application 

## **2 Alternating current mains switch - basic application** 

The ACS108-8TN 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: "Typical application schematic"_ . 

Thanks to its over-voltage protection and turn-off commutation performance, the ACS108-8TN switch can drive a small power high inductive load with neither varistor nor additional turn-off snubber. 

**Figure 16: Typical application schematic** 

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AC Mains<br>OUT<br>|<br>Vss<br>Rg<br>G<br>Vdd<br>COM<br>**----- End of picture text -----**<br>


## **2.1 Protection against overvoltage: the best choice is ACS** 

In comparison with standard Triacs the ACS108-8TN is overvoltage self-protected, as 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. 

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**ACS108-8TN** 

**Alternating** current mains switch - basic application 

## **2.1.1 High inductive load switch-off: turn-off over-voltage 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_ , 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 . 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 (230 V RMS, 50 Hz) ⑤ . 

**Figure 17: Switching off of a high inductive load - typical clamping capability of ACS108-8TN** 

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4<br>VCL<br>om :<br>I T<br>3 1<br>VT<br>(200 V/div) IH 2 3 4<br>IT 5 V T<br>(5 mA/div) V CL<br>1<br>I H<br>2<br>5<br>100 µs/div<br>**----- End of picture text -----**<br>


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**Alternating** current mains switch - basic application 

## **2.1.2 Alternating current mains transient voltage ruggedness** 

The ACS108-8TN 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 18_ is representative of the final ACS108-8TN 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 ACS108-8TN 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 ACS108-8TN breaks over safely as shown in _Figure 19_ . The ACS108-8TN 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. 

**Figure 18: Overvoltage ruggedness test circuit for resistive and inductive loads, Tamb = 25 °C (conditions equivalent to IEC 61000-4-5 standard)** 

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Surge generator<br>Rgenerator<br>2<br>Filtering unit Cc Model of the load<br>R L<br>OUT<br>GATE<br>Rg COM<br>mains<br>AC<br>**----- End of picture text -----**<br>


R = 150 Ω, L = 5 μH, Vpp = 2 kV (Surge Generator), Rg = 220 Ω, AC mains = 230 VRMS 50 Hz, Cc = 18 μF. 

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**Alternating** current mains switch - basic application 

**Figure 19: Typical current and voltage waveforms across the ACS108-8TN (+2 kV surge, IEC 61000-4-5 standard)** 

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VT (200 V/div)<br>IT max = 15.8 A<br>dIT/dt = 78 A/us<br>IT (4 A/div)<br>1 us/div<br>**----- End of picture text -----**<br>


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**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. 

- Epoxy meets UL94, V0 

- Lead-free packages 

## **3.1 SOT-223 package information** 

**Figure 20: SOT-223 package outline** 

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**Package** information 

**Table 6: SOT-223 package mechanical data** 

|**Ref.**|**Dimensions**|**Dimensions**|**Dimensions**|**Dimensions**|**Dimensions**|**Dimensions**|
|---|---|---|---|---|---|---|
||**Millimeters**|||**Inches**|||
||**Min.**|**Typ.**|**Max.**|**Min.**|**Typ.**|**Max.**|
|A|||1.80|||0.071|
|A1||0.02|0.10||0.001|0.004|
|B|0.60|0.70|0.85|0.024|0.027|0.033|
|B1|2.90|3.00|3.15|0.114|0.118|0.124|
|c|0.24|0.26|0.35|0.009|0.010|0.014|
|D|6.30|6.50|6.70|0.248|0.256|0.264|
|e||2.3|||0.090||
|e1||4.6|||0.181||
|E|3.30|3.50|3.70|0.130|0.138|0.146|
|H|6.70|7.00|7.30|0.264|0.276|0.287|
|V|10° max.||||||



**Figure 21: SOT-223 footprint (dimensions in mm)** 

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3.25<br>1.32<br>5.16 7.80<br>1.32<br>2.30 0.95<br>**----- End of picture text -----**<br>


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**Ordering** information 

**ACS108-8TN** 

## **4 Ordering information** 

## **Figure 22: Ordering information scheme** 

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ACS 1 08 - 8 T N - TR<br>AC switch series<br>Number of switches<br>Current<br>08 = 0.8 A rms<br>Voltage<br>8 = 800 V<br>Sensitivity<br>S = 5 mA<br>Package<br>N = SOT-223<br>Packing<br>TR = Tape and reel<br>Table 7: Ordering information<br>Order code  Marking  Package  Weight  Base qty.  Delivery mode<br>ACS108-8TN-TR  ACS1088T  SOT-223  0.11 g 1000  Tape and reel<br>**----- End of picture text -----**<br>


## **5 Revision history** 

||**Table 8: Document revision history**|**Table 8: Document revision history**|
|---|---|---|
|**Date**|**Revision**|**Changes**|
|02-Jun-2016|1|Initial release.|



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