Overview
The 2N7002KT is a small-signal N-channel MOSFET housed in a compact SOT-23 surface-mount package. As an enhancement-mode transistor, it requires positive gate-to-source voltage to conduct current. This component is particularly valued for its low on-state resistance (typically 5Ω) and fast switching characteristics. First introduced as a successor to through-hole MOSFETs, the 2N7002KT represents the industry shift toward miniaturized power electronics. Its standardized part number ensures cross-manufacturer compatibility, with major producers including ON Semiconductor, Diodes Inc., and Vishay.
Structure and Working Principle
The device consists of three terminals - Gate (G), Drain (D), and Source (S) - fabricated on a silicon die with proprietary doping profiles. When sufficient positive voltage (typically 1-2.5V) is applied to the Gate relative to Source, electrons form a conduction channel between Drain and Source. Unlike bipolar transistors, MOSFETs like the 2N7002KT are voltage-controlled devices with negligible gate current. The TO-236AB (SOT-23) package measures just 2.9 × 1.3 × 0.95mm, enabling high-density PCB layouts. Internal protection diodes are incorporated for basic ESD resilience.
Key Features
With a maximum drain-source voltage (VDS) of 60V and continuous drain current (ID) rating of 115mA, the 2N7002KT handles moderate power levels efficiently. Its threshold voltage (VGS(th)) of 0.8-3V makes it compatible with both 3.3V and 5V logic circuits. The device exhibits fast switching times (typically 10ns turn-on, 15ns turn-off) due to low input capacitance (≈50pF). Thermal resistance (JA) of 357°C/W necessitates attention to heat dissipation in continuous operation. RoHS-compliant versions are standard across manufacturers.
Application Areas
Primary applications include load switching in portable electronics (smartphones, tablets) where board space is constrained. The 2N7002KT commonly drives LEDs, small relays, or serves as interface buffers between microcontrollers and peripherals. Automotive systems utilize these MOSFETs for non-critical switching functions like dome lights or sensor power control. Industrial applications include PLC I/O modules and low-power motor drivers. Its cost-effectiveness makes it popular in high-volume consumer products requiring reliable switching solutions.
Maintenance and Precautions
While robust for surface-mount devices, the 2N7002KT requires standard ESD handling procedures during assembly. Soldering should follow JEDEC J-STD-020 guidelines with peak reflow temperatures not exceeding 260°C. Designers should derate parameters by 20% for thermal margin, especially when operating near maximum current ratings. Parallel connections of multiple devices can distribute load current but require gate resistors to prevent oscillation. Avoid inductive load switching without proper flyback diodes.
B2B Procurement Guide
Major distributors like Digi-Key, Mouser, and LCSC typically stock the 2N7002KT with lead times under 2 weeks for standard quantities. Minimum order quantities (MOQ) range from 1 reel (3,000 units) for premium services to full tape (10,000+ units) for bulk pricing. When sourcing, confirm manufacturer authenticity through authorized channels - counterfeit MOSFETs often fail under rated conditions. Consider alternative part numbers (e.g., BSS138, DMN3410U) for enhanced specifications or cost optimization. Quality certifications (AEC-Q101 for automotive) should be verified for critical applications.
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