New Industry Products

Diodes Incorporated Unveils New Space-saving Schottky Rectifiers

May 10, 2022 by Gary Elinoff

The fresh diodes “set new benchmarks” for current density in their class, the company says.

In response to ever growing market demand for electronic systems both more compact and powerful, Diodes Incorporated on April 27 released three new Schottky rectifiers that sport, the company says, industry-best current densities. 

Available in ultra-compact chip scale packages, the SDM5U45EP3, SDM4A40EP3 and the DT4U40EP3 are optimized for low forward voltage drop and for low leakage current. Their low thermal resistance allows designers to increase efficiency while reducing required board space.


Diodes' new Schottky rectifiers are available in highly compact packages. Image used courtesy of Diodes Incorporated


The SDM4A40EP3 and the SDT4U40EP3 are 4 A, 40 V devices, and the SDM5U45EP3 can handle 5 A at 45 V.


The SDT4U40EP3 

The 40-volt, 4-amp SDT4U40EP3 is a trench Schottky rectifier in a chip scale package (CSP). It features a maximum 0.55 volt forward voltage (0.47 V, typical), which serves to minimize power losses,  empowering OEMs to deliver more efficient end-products. It can also handle an 8.3 millisecond non-repetitive pulse of 28 A.

Diodes credits its specific cathode design and manufacturing processes with enabling the unit’s 800A/cm2 current density, which it claims to be the highest for any trench Schottky in the industry. The company also touts the SDT4U40EP3 as the industry’s smallest 4 A trench Schottky rectifier and the first ever offered in a 1608 package, whose footprint is 90% smaller, Diodes says, than that of any competing device. 


The 1608 package is 90% smaller than those of competing devices. Screenshot used courtesy of Diodes Incorporated


Thermal characteristics

  • Thermal resistance junction to ambient:  55 or 150 ℃/W, depending on mounting
  • Thermal resistance junction to case: 10 or 35 ℃/W, depending on mounting

Junction capacitance:

  • 295 pF (typical)

Electrostatic discharge:

  • Human body model: 8kV
  • Machine model: 0.4 kV


The SDM4A40EP3

The SDM4A40EP3 handles a forward voltage of 40 V with a maximum current of 4 A. Maximum forward voltage is 0.61 V, and maximum reverse current is 150 µA. It can handle 1 second, 66% duty cycle pulses of 6 A.

Thermal Characteristics 

  • Thermal resistance junction to ambient:  60 or 160 ℃/W, depending on mounting
  • Thermal resistance junction to case: 10 or 30 ℃/W, depending on mounting
  • Total power dissipation: 0.9 or 2.2 W, depending on mounting

Junction capacitance: 

  • 88 pF (typical)


The SDM5U45EP3 

The SDM5U45EP3 is a 45 V, 5 A Schottky rectifier. It features a maximum forward voltage and a maximum reverse current of 0.58 V and 140 µA, respectively. For current surges, it can handle up to 50 A for 8.3 milliseconds, subject to conditions. 

Thermal Characteristics 

  • Typical thermal resistance junction to ambient: 180 °C/W  

Total capacitance

  • 189 pF (typical)



The new units are purposed for space-constrained applications including portable, mobile, and wearable devices, as well as IoT hardware. They can serve as:

  • Blocking diodes
  • Boost diodes
  • Switching diodes
  • Reverse Protection diodes


Environmental Compliance

The new diodes are lead-free and fully RoHS-compliant. They are also halogen and antimony-free, “green” devices.


Regulatory Notes

The units can be produced to satisfy special automotive requirements such as AEC-Q100/101/200 and can also be manufactured in IATF 16949-certified facilities. They can as well meet specific production part approval processes (PPAP).


Physical Considerations 

  • The rectifiers operate over a -55 to +150 ℃ temperature range.
  • The SDM5U45EP3 is available in a X3-TSN1616-2 package with a footprint of 2 mm2 and a height of 0.25 mm
  • The SDM4A40EP3 and the SDT4U40EP3 are both offered in X3-TSN1608-2 packages that are also 0.25 mm high, and with an even smaller footprint of only 1.28 mm2.


Feature image used courtesy of BENCE BOROS/Unsplash