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How to Improve Heat Dissipation for SMD‑MOSFETs?
1. Introduction Excessive temperature is the main cause of early‑failure for surface‑mount MOSFETs used in BLDC motor drivers and DC‑DC power circuits. SMD packages such as DPAK, IPAK, SO‑8 have limited chip‑to‑ambient heat dissipation area. Proper thermal‑design can reduce junction temperatur...Read more -
Why the Absolute‑Value of PMOS Threshold‑Voltage Is Normally Larger Than NMOS？
1. Clarify a crucial concept For enhancement‑mode power‑MOSFET: NMOS threshold voltage VGS(th) is positive, typical range:0.7V‑1.0V. PMOS threshold voltage VGS(th) is negative, normally ‑0.9V ~ ‑1.3V. We compare absolute value here. PMOS does not have a bigger numerical reading, but a la...Read more -
Why the Absolute‑Value of PMOS Threshold Voltage Is Generally Larger Than NMOS
1. Clarify a key point first For enhancement‑mode devices: NMOS threshold voltage VGS(th) is positive, normally 0.7V‑1.0 V. PMOS threshold voltage VGS(th) is negative, roughly ‑0.9V ~‑1.3 V. We actually compare absolute values. The magnitude of PMOS threshold voltage is bigger, instead o...Read more -
Conduction Conditions of NMOS Transistors
1. Introduction NMOS transistors are divided into two types: enhancement-mode and depletion-mode. Their turn-on logic is completely different. Many engineers encounter abnormal heating, failure to turn on, and circuit leakage due to misunderstanding NMOS conduction conditions. This article use...Read more -
How to Evaluate MOSFET Performance Parameters During Component Selection?
1. Preface MOSFET selection directly affects circuit efficiency, heat generation, service life and stability. Many engineers only focus on voltage and current ratings while ignoring key performance indicators, which easily leads to excessive loss, overheating or device breakdown. ...Read more -
How to Judge MOSFET Working State According to Its Parameters
1. Introduction Many engineers only refer to MOSFET datasheet parameters for device selection, but do not know how to use real-time electrical parameters to judge the actual working state of the MOSFET in the circuit. Correct state judgment helps troubleshoot heating, abnormal switching, breakdow...Read more -
How to Read & Describe MOSFET Specification Parameters
1. Core Voltage Ratings (Absolute Maximum Ratings) 1.1 VDS – Drain-Source Voltage The maximum allowable voltage between drain and source under normal operation. Exceeding this value will cause avalanche breakdown and permanent damage to the MOSFET. Example marking: VDS = 60V, 100V, 200V, ...Read more -
Enhancement vs Depletion Mode MOSFETs – Full Comparison
1. Core Definition (Conduction State at Zero Gate-Source Voltage) 1.1 Enhancement-Mode MOSFET (E-MOSFET) When VGS = 0, no conductive channel exists, and the device is cut off with nearly zero drain current. A gate-source voltage exceeding the threshold voltage VGS(th) must be applied to form ...Read more -
Four Types of MOSFETs
Four Types of MOSFETs MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) can be classified into four basic types according to their channel type and operating mode. 1. N-Channel Enhancement MOSFET Abbreviation: N-Channel Enhancement MOSFET (N-MOS) Characteristics: The mos...Read more -
Heat Dissipation Solutions for SMD MOSFETs
Heat Dissipation Solutions for SMD MOSFETs Effective thermal management is essential for ensuring the reliability, efficiency, and longevity of SMD (Surface-Mount Device) MOSFETs. In high-current and high-frequency applications such as power supplies, inverters, motor drives, and battery manageme...Read more -
Differences Between Depletion-Mode MOSFETs and Enhancement-Mode MOSFETs
Differences Between Depletion-Mode MOSFETs and Enhancement-Mode MOSFETs 1. Fundamental Difference (Conduction State at Zero Gate Bias) (1) Enhancement-Mode MOSFET (E-MOSFET) When gate-source voltage \(V_{GS}=0\), the conductive channel is fully disconnected with nearly zero drain current. No in...Read more -
How to Quickly Identify MOSFET Parameters from Markings
1. Two Main Naming Conventions Convention1: Direct Marking (Most common for SMD & low-voltage MOSFETs,format: XXNYY / XXPYY) Format: Current + Channel (N/P) + Drain-Source Voltage Rating Letter N = N-channel (mainstream type); P = P-channel Leading digits: Maximum continuous drain current \(...Read more
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