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STPS340U

3A/40V Schottky rectifier, 0.55V VF, SMA package, fast switching

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Pieza del fabricante：

STPS340U

Paquete：

SMA (DO-214AC, 5.2 x 2.6 x 2.2 mm)

Marca：
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Descripción

Productos

The STPS340U from STMicroelectronics is a 3A/40V power Schottky rectifier in a SMA (DO-214AC) surface-mount package, featuring low 0.55V forward voltage drop for high-efficiency rectification.

Especificaciones

Tipo Power Schottky Rectifier
Reverse Voltage (VRRM) 40V
Forward Current (IFAV) 3A
Forward Voltage (VF) 0.55V (typ @ 3A, 25C)
Surge Current (IFSM) 80A (10ms sine)
Reverse Current (IR) 0.3 mA (max @ 40V, 25C)
Junction Capacitance 120 pF (typ @ 1MHz)
Paquete SMA (DO-214AC)
Temperatura de funcionamiento -65 to +175 C (TJ)

Características

  • Low 0.55V forward voltage for reduced conduction loss
  • 3A continuous current rating
  • 40V reverse voltage for 12V/24V systems
  • Fast switching (no reverse recovery)
  • SMA surface-mount package

Aplicaciones

  • DC-DC converter output rectification
  • Reverse polarity protection
  • Free-wheeling diode in buck converters
  • Battery charging circuits

The STPS340U from STMicroelectronics is a 3A 40V Schottky rectifier diode in an SMA (DO-214AC) surface-mount package. As a Schottky barrier rectifier, it uses a metal-silicon junction that provides a significantly lower forward voltage drop (0.55V typical at 3A) compared to standard silicon P-N junction diodes (typically 0.9-1.0V at the same current). This lower forward voltage directly reduces conduction power loss (P = VF x IF), improving efficiency in power supply rectification and free-wheeling applications. The 3A continuous current rating and 80A surge current rating make the STPS340U suitable for medium-power DC-DC converters, buck converter free-wheeling diodes, and reverse polarity protection in 12V and 24V systems. The 40V reverse voltage rating provides adequate margin for 12V automotive systems and 24V industrial supplies. As a majority-carrier device, the Schottky rectifier has essentially zero reverse recovery time, eliminating reverse recovery losses that limit P-N diode performance at high switching frequencies. The SMA package provides a compact footprint (5.2 x 2.6mm) suitable for automated surface-mount assembly, and its thermal resistance supports the full 3A rating with proper PCB copper area for heat dissipation.

The STPS340U operates as a Schottky barrier rectifier using a metal-semiconductor junction. The low barrier height of the Schottky junction results in a forward voltage drop of approximately 0.55V at rated current, compared to 0.7-1.0V for P-N silicon diodes. As a majority-carrier device, the STPS340U has essentially zero reverse recovery time, eliminating the reverse recovery charge and associated switching losses. The tradeoff for low VF is higher reverse leakage current compared to P-N diodes, but at 0.3mA maximum at rated voltage and 25C, this is acceptable for most applications.

Pin Nombre Función
1 Ánodo Positive terminal
2 Cátodo Negative terminal (marked with band)
  • 12V buck converter free-wheeling: 3A/40V Schottky replaces P-N diode, reducing conduction loss by 40%
  • Reverse polarity protection: series diode on 12V input with only 0.55V voltage drop
  • Battery OR-ing: two 12V batteries diode-ORed to load with minimum voltage drop
  • Automotive power supply: output rectification in 12V-to-5V buck converter at 2A
Fabricante Número de pieza Paquete Notas
ST STPS3L40U SMA Low VF version (0.40V)
onsemi MBR340T3G SMA 40V/3A equivalent
onsemi MBR140SFT1G SMA 40V/1A, smaller current
ST STPS5L60S SMC 5A/60V, higher rating
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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