ACST310-8BTR

## **ACST310-8B** 

## Overvoltage protected AC switch 

##  **Datasheet production data** 

## **Description** 

The ACST310-8B 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 3 A. 

## **Features** 

- AC switch with self over voltage protection 

- Microcontroller direct driven (low gate current max. 10 mA) 

This ACST310-8B switch embeds a Triac structure with 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 standard.The component needs a low gate current to be activated (IGT max. 10 mA) and still shows a high electrical noise immunity complying with IEC standards such as IEC 61000-4-4 (fast transient burst test). 

- Three quadrants (Q1, Q2 and Q3) 

- UL94-V0 certified resin (flammability) 

## **Figure 1. Functional diagram** 

- ECOPACK[®] 2 compliant component 

## **Benefits** 

- Enables equipment to meet IEC61000-4-5 

- High immunity against fast transients described in IEC61000-4-4 standard 

- Needs no external overvoltage protection 

- High off-state reliability device 

- Interfaces directly with the microcontroller – Reduces component count 

## **Applications** 

- AC static switching in appliances and industrial control systems 

- Driving low power highly inductive loads or resistive AC loads, such as motor control circuits, small home appliances, lighting, fan speed controllers, water valves, pumps, solid state relays, vacuum cleaners, heaters 

**Table 1. Device summary** 

|**Symbol**|**Value**|**Unit**|
|---|---|---|
|IT(RMS)|3|A|
|IGT(Q1, Q2, Q3)|10|mA|
|VDRM/VRRM|800|V|



ACS™, is a trademark of STMicroelectronics. ®: A.S.D., ECOPACK are registered trademarks of STMicroelectronics 

1/14 

February 2017 

DocID030200 Rev 1 

This is information on a product in full production. 

_www.st.com_ 

**Characteristics** 

**ACST310-8B** 

## **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= 112 °C|3|A|
|ITSM|Non repetitive surge peak on-state current<br>(Tjinitial = 25 °C)|f = 50 Hz|tp= 20 ms|20|A|
|||f = 60 Hz|tp= 16.7 ms|21||
|I2t|I2t value for fusing (Tjinitial = 25 °C)||tp= 10 ms|2.6|A²s|
|dI/dt|Critical rate of rise of on-state current<br>IG= 2 x IGT,tr 100 ns|f = 120 Hz|Tj= 125 °C|50|A/µs|
|VPP<br>(1)|Non repetitive line peak mains voltage||Tj= 25 °C|2|kV|
|PG(AV)|Average gate power dissipation||Tj= 125 °C|0.1|W|
|PGM|Peak gate power|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|||-40 to +150|°C|
|Tj|Operating junction temperature range|||-40 to +125|°C|
|TL|Maximum lead temperature for soldering during 10 s|||260|°C|



1. according to test described by IEC 61000-4-5 standard (see _Figure 18_ ). 

**Table 3. Electrical characteristics** 

|**Symbol**|**Test conditions**|**Quadrant**|**Tj**||**Value**|**Unit**|
|---|---|---|---|---|---|---|
|IGT<br>(1)|VOUT= 12 V, RL = 33|I - II - III|25 °C|Max.|10|mA|
|VGT||||Max.|1.1|V|
|VGD|VOUT= VDRM,RL = 3.3 k|I - II - III|125 °C|Min.|0.2|V|
|IH<br>(2)|IOUT= 100 mA||25 °C|Max.|20|mA|
|IL|IG= 1.2 x IGT|I - III|25 °C|Max.|25|mA|
|||II|||35||
|dV/dt(2)|VOUT= 67% VDRM, gate open||125 °C|Min.|1000|V/µs|
|(dI/dt)c(2)|(dV/dt)c = 0.1V/µs||125 °C|Min.|5|A/ms|
|(dI/dt)c(2)|(dV/dt)c = 10 V/µs||125 °C|Min.|1|A/ms|
|VCL<br>(2)|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 

2/14 

DocID030200 Rev 1 

**ACST310-8B** 

**Characteristics** 

**Table 4. Static characteristics** 

||**Table 4. Static characteristics**|**Table 4. Static characteristics**||||
|---|---|---|---|---|---|
|**Symbol**|**Test conditions**||**Value**||**Unit**|
|VTM<br>(1)|ITM= 4.2 A, tp= 380 µs|Tj= 25 °C|Max.|1.8|V|
|VTO<br>(1)|Threshold voltage|Tj= 125 °C|Max.|0.9|V|
|RD<br>(1)|Dynamic resistance|Tj= 125 °C|Max.|200|m|
|IDRM<br>IRRM|VOUT= VDRM/ VRRM|Tj= 25 °C|Max.|10|µA|
|||Tj= 125 °C||500||



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

**Table 5. Thermal resistances** 

||**Table 5. Thermal resistances**|**Table 5. Thermal resistances**|||
|---|---|---|---|---|
|**Symbol**|**Parameter**||**Value**|**Unit**|
|Rth(j-c)|Junction to case (AC)||3|°C/W|
|Rth(j-a)|Junction to ambient|SCu<br>(1)= 0.5 cm²|70|°C/W|



1. Scu = copper surface under tab 

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

## **Figure 3. On-state RMS current versus case temperature** 

DocID030200 Rev 1 3/14 ~~CS7~~ 

**Characteristics** 

**ACST310-8B** 

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

**Figure 6. Non repetitive surge peak on-state current for a sinusoidal pulse with width: tp < 10ms** 

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

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

4/14 

DocID030200 Rev 1 

**ACST310-8B** 

**Characteristics** 

**Figure 8. Relative variation of holding current Figure 9. Relative variation of gate trigger and latching current versus junction current and gate trigger voltage versus junction temperature (typical values) temperature (typical values)** 

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

**Figure 11. Relative variation of critical rate of decrease of main current versus junction temperature (typical values)** 

5/14 

DocID030200 Rev 1 

**Characteristics** 

**ACST310-8B** 

**Figure 12. Relative variation of static dV/dt immunity versus junction temperature** 

**Figure 13. Relative variation of leakage current versus junction temperature (typical values)** 

**Figure 14. Relative variation of critical rate of Figure 15. Relative variation of the maximal decrease of main current versus reapplied clamping voltage versus junction temperature (dV/dt) (typical value) (min. value)** 

6/14 

DocID030200 Rev 1 

**ACST310-8B** 

**Application information** 

## **2 Application information** 

## **2.1 Typical application description** 

The ACST310-8B device has been designed to switch on and off, or by phase angle control, highly inductive or resistive loads such as pump, valve, fan, or bulb lamps. Thanks to its high sensitivity (IGT max = 10 mA), this device can be driven directly by logic level circuits through a resistor as shown on the typical application diagram ( _Figure 16_ ). 

**Figure 16. Typical application schematic** 

7/14 

DocID030200 Rev 1 

**ACST310-8B** 

**Application information** 

## **Figure 17. Phase angle control typical diagram (inductive or resistive load)** 

8/14 

DocID030200 Rev 1 

**ACST310-8B** 

**Application information** 

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

In comparison with standard Triacs, which are not robust against surge voltage, the ACST310-8B is self-protected against over-voltage, specified by the parameter VCL. In addition, the ACST310-8B is a sensitive device (IGT max. 10 mA), but provides a high noise immunity level against fast transients. The ACST310-8B 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 ACST310-8B application, and is used to stress the ACST310-8B switch according to the IEC 61000-4-5 standard conditions. With the additional effect of the load which is limiting the current, the ACST310-8B 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 ACST310-8B folds back safely to the on state as shown in _Figure 19_ . The ACST310-8B 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 18. Overvoltage ruggedness test circuit for resistive and inductive loads for IEC 61000-4-5 standards** 

**==> picture [405 x 313] intentionally omitted <==**

**----- Start of picture text -----**<br>
���������������<br>����������<br>�������������� �� �����������������<br>� �<br>���<br>���� ���<br>��<br>��������<br>**----- End of picture text -----**<br>


1. R = 30 Ω, L = 10 µH, Vpp = 2 kV (Surge Generator), Rg = 220 Ω, AC mains = 230 VRMS 50 Hz 

9/14 

DocID030200 Rev 1 

**ACST310-8B** 

**Application information** 

**Figure 19. Typical voltage and current waveforms across the ACST310-8B during IEC 61000-4-5 standard test** 

## **2.3 Electrical noise immunity** 

The ACST310-8B is a sensitive device (IGT max. 10 mA) and can be controlled directly through a simple resistor by a logic level circuit, and still provides a high electrical noise immunity. The intrinsic immunity of the ACST310-8B is shown by the specified dV/dt equal to 1000 V/μs at 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 ACST310-8B with IGT = 10 mA has immunity comparable only for higher gate current device (IGT higher than 35 mA). 

10/14 

DocID030200 Rev 1 

**ACST310-8B** 

**Package information** 

## **3 Package information** 

- Epoxy meets UL94-V0 

- Lead-free package 

- Halogen free molding compound 

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 DPAK package information** 

## **Figure 20. DPAK package outline** 

**==> picture [398 x 284] intentionally omitted <==**

11/14 

DocID030200 Rev 1 

**ACST310-8B** 

**Package information** 

**Table 6. DPAK package mechanical data** 

||**Table 6. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 6. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 6. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 6. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 6. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 6. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|
|---|---|---|---|---|---|---|
|**Ref.**|**Dimensions**||||||
||**Millimeters**|||**Inches(1)**|||
||**Typ.**|**Min.**|**Max.**|**Typ.**|**Min.**|**Max.**|
|A||2.18|2.40||0.0858|0.0945|
|A1||0.90|1.10||0.0354|0.0433|
|A2||0.03|0.23||0.0012|0.0091|
|b||0.64|0.90||0.0252|0.0354|
|b4||4.95|5.46||0.1949|0.2150|
|c||0.46|0.61||0.0181|0.0240|
|c2||0.46|0.60||0.0181|0.0236|
|D||5.97|6.22||0.2350|0.2449|
|D1||4.95|5.60||0.1949|0.2205|
|E||6.35|6.73||0.2500|0.2650|
|E1||4.32|5.50||0.1701|0.2165|
|e|2.286|||0.09|||
|e1||4.40|4.70||0.1732|0.1850|
|H||9.35|10.40||0.3681|0.4094|
|L||1.00|1.78||0.0394|0.0701|
|L2|||1.27|||0.0500|
|L4||0.60|1.02||0.0236|0.0402|
|V2||-8 °|+8 °||-8 °|+8 °|



1. Inches only for reference 

## **Figure 21. DPAK recommended footprint** 

12/14 

DocID030200 Rev 1 

**ACST310-8B** 

**Ordering information** 

## **4 Ordering information** 

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

**Table 7. Ordering information** 

|**Order code**|**Marking**|**Package**|**Weight**|**Base qty.**|**Packing mode**|
|---|---|---|---|---|---|
|ACST310-8B|ACST 3108|DPAK|0.32 g per pc.|75|Tube|
|ACST310-8BTR||||2500|Tape and reel|



## **5 Revision history** 

**Table 8. Document revision history** 

|**Date**|**Revision**||**Changes**|
|---|---|---|---|
|24-Feb-2017|1|Initial release.||



13/14 

DocID030200 Rev 1 

**ACST310-8B** 

## **IMPORTANT NOTICE – PLEASE READ CAREFULLY** 

STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. 

Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. 

No license, express or implied, to any intellectual property right is granted by ST herein. 

Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. 

ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. 

Information in this document supersedes and replaces information previously supplied in any prior versions of this document. 

© 2017 STMicroelectronics – All rights reserved 

14/14 DocID030200 Rev 1