Design Win

Inrush current limiter for active AC-DC bridge rectifier

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Product overview


The STEVAL-SCR002V1 introduces a simple and innovative AC-DC front-end circuit that allows the designer to perform an inrush current limitation in any converter with input rectifier bridge topologies.

Based on a discrete control circuit made of one Z0110MN SMD triac and two STTH110A diodes, it offers a compact and non-insulated high voltage driver for the mains SCR. The drive circuit synchronizes the SCR gate signals with the AC line polarity and powers directly the SCR gate from the mains. This operation does not generate reverse losses in the SCRs.

This STEVAL-SCR002V1 solid-state solution provides a high reliability, a long service lifetime, an electromagnetic interference reduction, and a faster response compared to electromechanical solutions.

This solution is also compatible with an inrush current limitation performed either in the NTC/PTC bypass mode or in the MCU phase-control mode.

The enable control pin of the SCR driver is referenced to GND_DC. Therefore, an uninsulated power supply or a direct control by the MCU can be used.

With five wires to connect, the STEVAL-SCR002V1 is designed for an easy implementation on existing AC-DC converters for plug-and-play tests.

It is suitable for applications with an RMS current up to 4.3 A (at an ambient temperature of 60°C).

  • All features

    • Two TN1605H-8T 16 A - 800 V Hi Tj SCRs in a TO-220 package, used to bypass the inrush resistor
    • Compact solution: 43.6 x 28.5 mm (≈ 1.8 sq in)
    • Compatible with AC-DC converters with or without PFC in all modes: CCM, CRM, and DCM
    • Enable signal (EN = 3.3 V to 15 V) versus GND_DC (DC or PWM signal)
    • Suitable for applications from 50 W up to 1000 W (230 VRMS, TAMB = 60°C)
    • Compliant with AC or DC input voltage: 90-265 VAC, 50/60 Hz, 4.3 ARMS or 120-400 VDC, 2 A
    • Robust, immune (2 kV IEC 61000-4-5, 4 kV IEC 61000-4-4)
    • Low EMI noise (EN55014 and EN55022) solution

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade WEEE Compliant Material Declaration**
CARD Industrial Ecopack2 Yes




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(**) 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.

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TN1605H-6T, STTH110A, Z0107MN 5AA4

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