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




Technical Documentation

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

Hardware Resources

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


License Agreement
Description Version Size
Evaluation products license agreement 1.0 125 KB
Support & Community
Featured Products

Sample & Buy

Part Number 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 Buy Direct 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

Quality & Reliability

Part Number 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.