Spark Logic

2N7000 N-channel MOSFET connection guide

2N7000 N-channel MOSFET TO-92 formed leads wiring guide with power, signal assignments, and bench checks.

TO-92 straight leads 3 contacts

TO-92 formed leads

3 contacts Current package

onsemi · Case 135AR · 2.40–2.80 mm formed lead pitch · mechanical outline 98AON13879G.

Tape-and-reel code in NDS7002A/D p. 7.

Wire the common return and gate pull-down

Required

Keep both supplies off. Connect source and both supply returns together. Fit a 100 kΩ resistor from G to S to define the off state when the gate jumper is open. Use an ESD-safe work area.

  • Gate
  • Common 0 V
    • S (1)
    • Load supply return
    • Gate supply return
    • R2.2
R2 100 kΩ between Gate and Common 0 VGateR2 100 kΩCommon 0 V

Bench checks

  • Verify the flat-face lead order and that R2 connects to G and S. Set the load supply to 5 V with a 10 mA limit and the gate supply to 10 V with a 1 mA limit.

onsemi NDS7002A/D Rev. 11, pp. 1–3; onsemi 2N7000TA/D Rev. 1, pp. 1–2. The pull-down and limits are bench choices.

Connection scenarios

Switch a 5 V resistive load

Put a 1 kΩ, 0.25 W load resistor between the +5 V rail and D. Keep the source and both supply returns joined. Connect G to the common return for the off test, then move the gate jumper to the +10 V gate supply for the on test.

Low-side switch with 5 volts through R1 to 2N7000 drain, source at common return and a gate pull-down to source.+5 VR1 1 kΩG drive 0 / 10 VGD2N7000SR2 100 kΩCommon 0 V
  • Load supply
    • Regulated +5 V
    • R1.1
  • Load return
  • Gate
    • 0 V or +10 V gate jumper
    • G (2)
    • R2.1
  • Common 0 V
    • S (1)
    • Load supply return
    • Gate supply return
    • R2.2

Bench checks

  • With the meter common at S, verify VGS is near 0 V for off and 10 V for on. D should read near 5 V with the gate low and close to 0 V with it high.
  • The 1 kΩ load draws about 5 mA when on. If D stays low with G at 0 V, turn off power and verify the orientation and the D/S connections.

onsemi NDS7002A/D Rev. 11, pp. 1–3; onsemi 2N7000TA/D Rev. 1, pp. 1–2. This example uses a resistive load and the shared 10 V gate test point.

TO-92 formed leads wiring map

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

TO-92 formed leads
Flat marked face toward you and splayed leads pointing down. Left to right: source, gate, drain.
Selected pin details

3 · D

Drain · Outputs

Connect to the low side of the load in a low-side switch. The intrinsic body diode has its cathode here.

onsemi NDS7002A/D Rev. 11, p. 1

Electrical limits · Pin in the reference

Models and documents

onsemi TO-92 cases 135AN and 135AR. The 2N7000BU and 2N7000TA order codes use a separate electrical table. The SOT-23 2N7002 and NDS7002A have a different lead map and their own ratings.

2N7000-D26Z
Tape-and-reel code in NDS7002A/D p. 7.
2N7000-D74Z
Ammo code in NDS7002A/D p. 7. Confirm the supplied lead form against the package drawing.
2N7000-D75Z
Tape-and-reel code in NDS7002A/D p. 7. Confirm the supplied lead form against the package drawing.
2N7000TA
Fan-fold code in 2N7000TA/D.