Spark Logic

2N7002 N-channel MOSFET family connection guide

2N7002 N-channel MOSFET family (SOT-23 · single) connection guide. Check low-side switching.

SOT-23 · single

3 contacts Current package
SOT-323 · single 3 contacts
SOT-523 · single 3 contacts
SOT-363 · dual 6 contacts

Diodes Incorporated / PANJIT / MCC / Jiangsu Changjing · Diodes 2N7002. Pin 1 gate, pin 2 source, pin 3 drain.

Check low-side switching

Required

Use a 1 kΩ load and a 5 V current-limited supply. With a common ground, drive the gate first to 0 V and then to 10 V.

Check low-side switching5 V1 kΩMeasure D0 / 10 VGate GND
  • Load supply
    • Current-limited 5 V supply
    • RL.1
  • Drain
    • RL.2
    • Meter positive
  • Gate drive
    • →
    • Switchable 0 V / 10 V drive
  • Return
    • Meter common
    • Gate supply return
    • Load supply return

Bench checks

  • At 0 V gate drive, the drain should be near 5 V. At 10 V the drain should fall close to ground.
  • This is a function check at roughly 5 mA. Check the exact device limits before choosing a logic-level gate drive or a higher load.

Diodes DS11303 Rev. 40-2, equivalent circuit and electrical characteristics. Supply and load values are fixture choices.

SOT-23 · single wiring map

External wiring example · Check low-side switching

Highlighted contacts are used in the required step or selected circuit. Select a contact to highlight its wiring nets.

SOT-23 · single
Top view, single lead at the top. Pin 1 is lower left, pin 2 lower right and pin 3 at the top.
Selected pin details

1 · G

Input · Control

Gate. Drive relative to its own source. A gate threshold measurement does not establish low on-resistance.

Diodes DS11303 Rev. 40-2, p. 1

Electrical limits · Pin in the reference

Models and documents

The reported K72 K 4 has three leads (1+2). That fits the documented single MOSFETs in SOT-23, SOT-323 or SOT-523 and rules out the six-lead 2N7002DW for this specimen. Measure the moulded body, excluding leads: roughly 2.9 mm for SOT-23, 2.0 mm for SOT-323 and 1.6 mm for SOT-523. Diodes documents K72 plus a separate two-character date code; the format alone does not identify the manufacturer.

2N7002-7-F
Diodes Incorporated K72 device code, tape and reel.
2N7002-13-F
Diodes Incorporated K72 device code, tape and reel.
2N7002K
PANJIT SOT-23, K72, with gate ESD protection.