2N7000 Explained
| 2N7000 / 2N7002 |
| Type: | MOSFET Transistor |
| Working Principle: | N-channel |
| Pins: | G = Gate, D = Drain, S = Source. The symbol doesn't always show the internal diode formed between the substrate and the source/drain/channel. |
The 2N7000 is an N-channel, enhancement-mode MOSFET used for low-power switching applications. [1]
The 2N7000 is a widely available and popular part, often recommended as useful and common components to have around for hobbyist use.[2]
Packaged in a TO-92 enclosure, the 2N7000 is rated to withstand 60 volts and can switch 200 millamps.
Applications
The 2N7000 has been referred to as a "FETlington" and as an "absolutely ideal hacker part."[3] The word "FETlington" is a reference to the Darlington-transistor-like saturation characteristic.
A typical use of these transistors is as a switch for moderate voltages and currents, including as drivers for small lamps, motors, and relays.[1] In switching circuits, these FETs can be used much like bipolar junction transistors, but have some advantages:
- high input impedance of the insulated gate means almost no gate current is required
- consequently no current-limiting resistor is required in the gate input
- MOSFETs, unlike PN junction devices (such as LEDs) can be paralleled because resistance increases with temperature, although the quality of this load balance is largely dependent on the internal chemistry of each individual MOSFET in the circuit
The main disadvantages of these FETs over bipolar transistors in switching are the following:
- susceptibility to cumulative damage from static discharge prior to installation
- circuits with external gate exposure require a protection gate resistor or other static discharge protection
- Non-zero ohmic response when driven to saturation, as compared to a constant junction voltage drop in a bipolar junction transistor
Other devices
Many other n-channel MOSFETs exist. Some part number are 2N7002, BS170, 2N7002, VQ1000J, and VQ1000P. They may have different pin outs, packages, and electrical properties. The BS250P is "a good p-channel analog of the 2N7000."[4]
External links
- Datasheets
- 2N7000, 200mA, TO-92 case, On Semiconductor
- BS170, 500mA, TO-92 case, On Semiconductor
- 2N7002, 300mA, SOT-23 case, NXP Semiconductors
- NX7002AK, 300mA, SOT-23 case, NXP Semiconductors
Notes and References
- Web site: 2N7000/2N7002, VQ1000J/P, BS170 . Vishay Siliconix datasheet . 28 March 2011 .
- Book: Two-way radios & scanners for dummies . H. Ward Silver . 2005 . 0-7645-9582-2 . 237 .
- Lancaster . Don . Don Lancaster . February 1986 . Hardware hacker . . 3 . 2 . 115 . Richard Ross . 0748-9889 .
- Book: PIC microcontrollers . Lucio Di Jasio . Tim Wilmshurst . Dogan Ibrahim . Newnes . 2007 . 978-0-7506-8615-0 . 520 .
