Description

• Marking on Device: UTC, 7NM70G, 01 SMCU
• Manufacturer: UTC (Unisonic Technologies Co., Ltd.)
• Device Type: N-Channel Super Junction Power MOSFET
• Package: TO-252 (DPAK), Surface Mount
• Pin Configuration (left to right, as marked on body):

  Pin	Function
  1	Gate (G)
  2	Drain (D)
  3	Source (S)
  (Note: Tab/mounting pad is internally connected to Drain)

What This Component Does
This is a Super Junction structured N-channel power MOSFET, used as an electronic switch to control current flow in a circuit using a small gate-controlled signal. Compared to standard planar MOSFETs, the super junction design allows for lower on-state resistance and faster switching, making it well-suited for high-frequency switching duty in power conversion circuits like DC-DC and AC-DC converters.

Core Electrical Ratings

Important Usage Notes (for support/troubleshooting reference)

• High voltage rating, moderate current: At 700V/7A, this MOSFET is designed for offline (mains-referenced) power supplies rather than low-voltage logic-level switching applications. It is not a logic-level MOSFET — a proper gate driver capable of reaching ~10V VGS is needed to fully turn it on with low RDS(on).
• Surface mount thermal considerations: In the TO-252 (DPAK) package, the exposed metal tab (and top-side heat tab) is the primary heat dissipation path and is internally connected to the Drain. Adequate PCB copper pour is essential to achieve rated power dissipation — undersized copper area is a common cause of premature thermal failure in SMD MOSFET applications.
• ESD sensitive: As with all MOSFETs, the gate is susceptible to electrostatic discharge damage. Standard ESD handling precautions should be used during replacement or rework.
• Avalanche rated: This device includes specified avalanche energy characteristics, meaning it has some built-in tolerance to voltage transients beyond VDSS for brief moments — however, this should not be relied upon as a substitute for proper snubber/clamping circuit design in the end application.
• Verify orientation before replacement: Since Gate, Drain, and Source pin order can vary between manufacturers/packages even for similar part numbers, always confirm the pinout against the datasheet before soldering a replacement.

Typical Applications
High-efficiency switch-mode power supplies (SMPS), PWM motor control, AC-to-DC converters, bridge circuits, and general high-voltage switching applications requiring fast switching and low conduction loss.

When to Replace This Component
Failure is typically caused by: exceeding the 700V VDSS rating (voltage spikes from inductive loads without proper snubbing), gate-source overvoltage beyond ±30V, excessive drain current beyond 7A, or insufficient PCB thermal dissipation leading to junction overheating. A failed MOSFET commonly tests as a dead short between Drain and Source when checked with a multimeter, or fails to switch on/off at all.

Package Includes:

• 1 x UTC 7NM70G N-Channel Power MOSFET