Demonstration board with full 3.3 V ACS/Triac control using the STM32F100

The STEVAL-IHT005V2 is designed as a complete solution proposal for home appliance applications based on STMicroelectronics™ components. Special emphasis is placed on demonstration of a robust full 3.3 V solution, based on 4 kV level in class A during an IEC-61000-4-4 (burst) test. The board also allows designers to evaluate the feasibility of AC switch control with a 3.3 V supply. Gate currents can be measured and compared to the information given in application note AN2986. STEVAL-IHT005V2 is based on the recently-introduced 48-pin, 32-bit STM32F100C4T6B MCU running at 24 MHz (RC user-trimmable internal RC clock), featuring 16 kBytes of Flash memory, 12-bit A/D converter, 5 timers, communication interfaces, and 4 kBytes of SRAM. The power supply circuitry is based on the VIPer16L, an offline converter with an 800 V avalanche-rugged power section, operating at 60 kHz. The power supply provides negative 6 V in buck-boost topology. The STEVAL-IHT005V2 can control 2 high power loads up to 2830 W thanks to the T1635H, a 16 A, 600 V high temperature Triac and up to 2050 W using the ACST1635-8FP, a 16 A, 800 V high temperature overvoltage-protected ACST device. The high power load control is based on phase-angle control. To limit inrush current and possible current peaks, the board features a soft-start routine and a smooth power change function for the high power loads. The STEVAL-IHT005V2 can also control 4 low power loads up to 100 W thanks to 3 ACS108-8S, 0.8 A, 800 V overvoltage-protected ACS devices and a Z0109, 1 A standard 4 quadrant 600 V Triac.

Key Features

  • Complete solution for -3.3 V control
  • Input voltage range: 90-265 VAC 50/60 Hz
  • Negative 6 V/3.3 VDC aux power supply based on the VIPer16L in buck-boost topology
  • Total power consumption in standby mode lower than 0.5 W for 264 V/50 Hz
  • 48-pin, 32-bit value line family STM32F100C4T6B MCU as main controller
  • Zero voltage switching (ZVS) interrupt to synchronize MCU events with voltage mains
  • 1 x T1635H-6T and 1 x ACST1635-8FP for phase control of high power loads
  • 5 discrete power level states with soft change for phase-angle controlled devices
  • 1 x Z0109 and 3 x ACS108 for full wave control of low power loads
  • Relay to demonstrate board noise robustness
  • Red LED to indicate board mains supply
  • Green LED for each ACS/ACST/Triac to indicate device on/off status
  • JTAG programming connector
  • External wire loop for gate current measurement
  • I2 C bus hardware/software ready
  • IEC 61000-4-4 pre-compliance test passed (burst up to 8 kV)
  • IEC 61000-4-5 pre-compliance test passed (surge up to 2 kV)
  • RoHS compliant





Description Version Size
DB2009 DB2009: Demonstration board with full 3.3 V ACS/Triac control using the STM32F100 1.0 398 KB
Description Version Size
UM1631 UM1631: STEVAL-IHT005V2 - 3.3 V control of ACS®/Triac with STM32™ 1.1 1 MB


Board Manufacturing Specifications
Description Version Size
STEVAL-IHT005V2 gerber files 1.0 77 KB
Bill of Materials
Description Version Size
Schematic Packs
Description Version Size
STEVAL-IHT005V2 schematics 1.0 150 KB


Description Version Size
Evaluation products license agreement 1.0 125 KB
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型号 Core Product Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STEVAL-IHT005V2 ACS108, Z01, ACST1635-8FP, T1635H, STM32F100 Active 189.88 1 NEC EAR99 ITALY MORE INFO 直接购买 Add to cart DISTRIBUTOR AVAILABILITY

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors


型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEVAL-IHT005V2 ActiveCARDIndustrialEcopack2

(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.