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The SMA4F and SMA6F unidirectional Transient Voltage Suppression (TVS) diodes introduced by STMicroelectronics are packaged in a thin SMA Flat package to provide space savings in circuits which require protection from high peak-power pulses. The SMAxF devices are footprint-compatible with their sister SMAJ and SMBJ families.

At just 1mm high, the SMA4F and SMA6F series of TVS protection devices are ideal for designs in which space is an important constraint. Their planar technology is well suited to circuits that require low leakage current and a high maximum junction temperature of 175°C, providing long-term reliability and stability. The TVS diodes maintain a high power rating even at the maximum operating junction temperature.

The devices in the SMA4F series have a peak pulse power rating of 400W for a 10/1000μs waveform. For the SMA6F series, this power rating is 600W. Each of the SMA4F and SMA6F series consists of 32 parts featuring stand-off voltage ratings ranging from 5.0V to 188V.


SMAxF TVS diodes: 175°C maximum junction temperature

SMAxF TVS diodes: 175°C maximum junction temperature


  • Peak pulse power:
    SMA6F series: 4kW for 8/20μs waveform
    SMA4F series: 2.5kW for 8/20μs waveform
  • 1μA leakage current at 85°C
  • UL94-V0 compliant
  • 25kV contact discharge rating according to IEC 61000-4-2
  • Industrial power supplies
  • Factory automation
  • Motor control
  • Battery chargers
  • Air-conditioning units
  • Home appliances
  • Uninterruptible power supplies
  • DC-DC converters
  • Switch-mode power supplies
  • Smart metering equipment
  • Building automation


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