Project Files of N-MOSFET Library for Proteus: IRLZ44N, IRFZ44N and 2N7000

N-MOSFET LIBRARY FOR PROTEUS - V1.0 (IRLZ44N, IRFZ44N and 2N7000 N-channel MOSFETs with a pop-up)
Designed by The Engineering Projects
www.TheEngineeringProjects.com

IMPORTANT LINKS
Article (read it first - pictures, step by step, every feature explained):
  https://www.theengineeringprojects.com/2026/11/n-mosfet-library-for-proteus.html
Report a bug or suggest a feature (our forum):
  https://www.theengineeringprojects.com/forum/category/n-mosfet-proteus-library
The demo runs on our Arduino UNO V4.0 (included) - working LEDs, RESET and a
built-in serial monitor, no Virtual Terminal to wire - its own article:
  https://www.theengineeringprojects.com/2026/10/arduino-uno-library-for-proteus-v40.html
The demo's loads are our own power resistors (included):
  https://www.theengineeringprojects.com/2026/11/power-resistor-library-for-proteus.html
its LED is our own 5 mm LED (included):
  https://www.theengineeringprojects.com/2026/11/5mm-led-library-for-proteus.html
Support us (the libraries are free):
  https://www.theengineeringprojects.com/donate

FILE STRUCTURE
N-MOSFET-TEP-v1.0/
|-- Proteus Library Files/
|   |-- ArduinoV4TEP.LIB                              201.9 KB   TEP Arduino boards V4.0 (UNO) -> LIBRARY
|   |-- TEPLED5MM.LIB                                  21.8 KB   a part the demo uses -> LIBRARY folder
|   |-- TEPNMOS.LIB                                    17.9 KB   the library -> LIBRARY folder
|   |-- TEPPOWERRES.LIB                               157.2 KB   a part the demo uses -> LIBRARY folder
|   |-- TEPRESISTOR.LIB                               306.9 KB   a part the demo uses -> LIBRARY folder
|-- Proteus Model Files/
|   |-- TEPARDUINO.DLL                                883.5 KB   the Arduino board model -> MODELS folder
|   |-- TEPLED5MM.DLL                                 289.5 KB   its model -> MODELS folder
|   |-- TEPNMOS.DLL                                   295.0 KB   the model -> MODELS folder
|   |-- TEPPOWERRES.DLL                               304.5 KB   its model -> MODELS folder
|   |-- TEPRESISTOR.DLL                               311.0 KB   its model -> MODELS folder
|-- Proteus Simulation/
|   |-- MOSFET_Demo.hex                                 9.7 KB   the demo firmware
|   |-- N-MOSFET-Switches-ArduinoUnoV4.pdsprj          26.3 KB   the demo project
|   |-- TEPARDUINO.DLL                                883.5 KB   copy of the board model
|   |-- TEPLED5MM.DLL                                 289.5 KB   copy of its model
|   |-- TEPNMOS.DLL                                   295.0 KB   copy of the model
|   |-- TEPPOWERRES.DLL                               304.5 KB   copy of its model
|   |-- TEPRESISTOR.DLL                               311.0 KB   copy of its model
|-- Arduino Code/
|   |-- MOSFET_Demo/MOSFET_Demo.ino                     1.7 KB   the demo sketch (source of the .hex)
|-- README.txt                                        ~13.5 KB   this file
Total: 4.81 MB (unzipped). The C++ source code of the models is not included.

WHAT IS IT?
Three N-channel MOSFETs, drawn at true scale:
  * IRLZ44N - logic level, TO-220 (G D S, the tab is D): 55 V, 47 A, 22 mohm with only 5 V on its
    gate.
  * IRFZ44N - standard, TO-220: 55 V, 49 A, 17.5 mohm at 10 V on its gate - but about 42 mohm at 5
    V.
  * 2N7000 - small signal, TO-92 (S G D): 60 V, 200 mA, about 5 ohm.
  * One analog model: the channel (a square law with a smooth threshold, the triode and saturation
    regions, channel-length modulation, the drain's
    series resistance), the gate capacitance Ciss (a gate resistor charges it), the body diode, and
    the junction temperature through the heatsink
    (HEATSINK NONE, SMALL, LARGE on the TO-220 parts); past its limit it fails short D-S.
  * It names its region (OFF, ON, SATURATION, PWM, DIODE ON), warns when a standard part is
    under-driven, and draws its output curves with the working
    point. Click one at Run for the pop-up: the region, Rds now, the gate drive against its rating,
    the curves, graphs, an event log and a check page.
The body is drawn as on the real part and to true scale against our Arduino.
The TEP signature and the pop-up are TEP additions.

THREE DEVICES (search "IRLZ44", "IRFZ44" or "2N7000" in Pick Devices):
  IRLZ44NTEP   "IRLZ44N N-MOSFET V1.0" in TEPNMOS.LIB (Transistors > MOSFET), prefix Q, model
  TEPNMOS.DLL. Pins 1 G, 2 D, 3 S.
  IRFZ44NTEP   "IRFZ44N N-MOSFET V1.0" in TEPNMOS.LIB, prefix Q, model TEPNMOS.DLL. Pins 1 G, 2 D, 3
  S.
  Q2N7000TEP   "2N7000 N-MOSFET V1.0" in TEPNMOS.LIB, prefix Q, model TEPNMOS.DLL. Pins 1 S, 2 G, 3
  D.

THE POP-UP
Click the part at Run. Tabs:
    MOSFET     the region with the current and Rds, the package with its live pins, the gate drive
    against its threshold and its rating, the output
               curves (Id against Vds at four gate voltages) with the working point, and eight live
               values. The toolbar: New part, the pins, the heatsink.
    Graphs     the live values over the last 2, 6 or 15 s. Live / Freeze.
    Event log  every change and warning; filters All / Changes / Warnings, Pause, Clear
    Check      what the part is doing and what to look at, each with a verdict (green = fine, amber
    = check, red = wrong)
    Settings   theme, text size, open at Run, window size
    Help       report a bug, suggest a feature, article, updates, donate, forum; Copy diagnostics
    for a bug report

TEST STATUS
V1.0: verified in Proteus 8.5 on 31 Oct 2026 (the demo project as shipped: an A4 sheet, an Arduino UNO V4.0).
What the runs showed (the model's own numbers and the sketch's monitor):
  * The project loads and starts cleanly. (Before the runs, the MOSFET law was checked in a separate
    solver: Rds(on) 22 mohm for the IRLZ44N at 5 V,
    17.6 mohm for the IRFZ44N at 10 V but 42 mohm at 5 V - the datasheets' figures - and the demo's
    currents, which the runs then matched.)
  * Step 1, both on with 5 V on their gates: the IRLZ44N carried 545 mA through 22.0 mohm (12 mV,
    6.5 mW); the IRFZ44N the same 544 mA through
    41.7 mohm (23 mV, 12.4 mW) - its log warned UNDER-DRIVEN, and its Check page compares 42 mohm
    with its 18 mohm at 10 V.
    The 2N7000 lit the red LED: 6.82 mA through 4.93 ohm.
  * Step 2, both at 50 % PWM: the pop-up read the gate as PWM at 490 Hz, about 50 % on - one line in
    the log, not three an edge.
  * Steps 3 and 4: both off with 12.0 V across them; then the IRLZ44N alone. The monitor printed
    every step.
  * Each gate charge drew about 20 mA for a moment through its 220 ohm gate resistor (Ciss 1.7 nF /
    1.47 nF).
  * The pop-up: MOSFET, Graphs, Event log, Check - all four pages followed the run, for all three
    MOSFETs.

INSTALLATION (about 2 minutes)
1. Close Proteus. Extract the WHOLE ZIP to a normal folder (e.g. Desktop).
2. Copy everything in "Proteus Library Files" (TEPNMOS.LIB, TEPRESISTOR.LIB, TEPPOWERRES.LIB,
TEPLED5MM.LIB and our Arduino library V4.0, ArduinoV4TEP.LIB, with the ARDUINO UNO V4.0 used by the
demo) to the LIBRARY folder of Proteus, for example:
     C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\LIBRARY
   (use the folder that already holds Proteus's own .LIB files).
3. Copy TEPNMOS.DLL, TEPRESISTOR.DLL, TEPPOWERRES.DLL, TEPLED5MM.DLL and TEPARDUINO.DLL from
"Proteus Model Files" to the MODELS folder (...\Proteus 8 Professional\MODELS).
4. Delete TEPNMOS.IDX from the LIBRARY folder if it is there (Proteus makes a new index).
5. Start Proteus. In Pick Devices (P) search "IRLZ44, IRFZ44 or 2N7000".

RUN THE DEMO
"Proteus Simulation\N-MOSFET-Switches-ArduinoUnoV4.pdsprj" (an A4 sheet) - keep the .hex file and
the DLLs beside the project.
  ARD1:   Arduino UNO V4.0 running MOSFET_Demo.hex, its serial monitor built in (window "TEP Arduino
  UNO - ARD1").
  Q1 IRLZ44N: D9 - R1 220 - gate, R2 100k gate to GND; +12V - R3 (our 10 W power resistor, 22 ohm) -
  drain; source to GND.
  Q2 IRFZ44N: D10 - R4 220 - gate, R5 100k gate to GND; +12V - R6 (22 ohm, 10 W) - drain; source to
  GND.
  Q3 2N7000:  D8 - R7 100 - gate; +5V - R8 470 - D1 (our red LED) - drain; source to GND.
  1. Press Run. Every 2.5 s the next step: both on / both at 50 % PWM / both off / the IRLZ44N
  alone; the 2N7000 lights the LED every other step.
  2. Compare the two TO-220 parts' pop-ups: the same 5 V on their gates, a different Rds.
Closed the monitor? Click the UNO's USB port.

WIRING (the same in Proteus and on a real board)
  pin - 220 ohm - gate; 100k gate to source; load from +V to drain; source to GND     (low side)
  a standard MOSFET from a 5 V pin: only partly on - use a logic-level part, or a gate driver for 10
  V
REAL HARDWARE:
 * Logic level means fully on at 4 to 5 V on the gate (IRLZ44N); a standard part (IRFZ44N) needs 10
   V for its rated Rds.
 * A gate resistor (100 to 220 ohm) limits the pin's charging current; a pull-down (10k to 100k)
   keeps it off while the pin floats.
 * The body diode runs from S to D: across a coil you still need a flyback diode.
 * The tab of a TO-220 MOSFET is the drain: insulate it from a grounded heatsink.

THE DEMO SKETCH ON THE SERIAL MONITOR (MOSFET_Demo V1.0, 9600 baud)
There are no commands. The sketch steps every 2.5 s and prints each step.
EXPECTED MONITOR OUTPUT
  N-MOSFETs - The Engineering Projects
  Step 1: both on (5 V on the gates), LED on
  Step 2: both at 50 % PWM, LED off

PROPERTIES (double-click the part > Edit Properties)
  Part (VALUE)                     IRLZ44N, IRFZ44N or 2N7000
  Heatsink (TO-220 only)           NONE (62 C/W, 2.0 W safe), SMALL (15 + 1.5 C/W, 7.6 W), LARGE (5
  + 1.5 C/W, 19 W)
Every run starts again from the properties.

LINKS.INI (OPTIONAL)
The Help page cards of the pop-up open web pages. To point them somewhere else without a new DLL,
put a text file named links.ini next to TEPNMOS.DLL with lines KEY=URL, for example:
  ARTICLE=https://www.theengineeringprojects.com/...
Keys: WEBSITE, FORUM, BUG_REPORT, FEATURE_REQUEST, ARTICLE, USER_GUIDE,
UPDATE_CHECK, DONATE. Only http:// and https:// links are used; lines starting
with # are comments.

TROUBLESHOOTING
* UNDER-DRIVEN on a standard part: 5 V is not enough for its rated Rds - a logic-level part, or a
  gate driver.
* SATURATION with volts across it: the gate is too low for the load - more gate voltage, or a
  logic-level part.
* It turns on by itself: the gate floats - add a pull-down from gate to source.
* TOO HOT: the junction passed 150 C - a heatsink, or a part with a lower Rds.
* The part is not simulated: TEPNMOS.DLL is missing from MODELS and from the project folder. No UNO
  / no monitor window: TEPARDUINO.DLL is missing, or click the UNO's USB port.

BUG REPORTS AND FEATURE REQUESTS
Please post them in our forum with a screenshot, the Serial Monitor text, the
simulation log and the pop-up's Copy diagnostics text:
  https://www.theengineeringprojects.com/forum/category/n-mosfet-proteus-library

SUPPORT US
This library is free. If it saves you time, please support our work:
  https://www.theengineeringprojects.com/donate

WEBSITE
  https://www.theengineeringprojects.com/

LICENCES AND THIRD-PARTY NOTES
* The model (TEPNMOS.DLL), the symbols and artwork, the other parts of ours in the demo and the
  Arduino Library V4.0 (ArduinoV4TEP.LIB / TEPARDUINO.DLL, with its built-in TEP Serial Monitor
  Advance) are made by The Engineering Projects. The models use only standard Windows libraries; no
  Visual C++ redistributable is needed.
  The C++ source code is not included.
* Arduino UNO V4.0 (ArduinoV4TEP.LIB / TEPARDUINO.DLL, our Arduino Library V4.0 - its
  microcontroller is Proteus's own AVR model): The Engineering Projects,
  https://www.theengineeringprojects.com/2026/10/arduino-uno-library-for-proteus-v40.html
* The .hex file is built from the demo sketch and the Arduino AVR core 1.8.6, which includes
  LGPL-licensed code; its source code is available at
  https://github.com/arduino/ArduinoCore-avr/tree/1.8.6
* Proteus is a product of Labcenter Electronics and is not included. Arduino is a trademark of Arduino SA.
  This library is not made or endorsed by Arduino or Labcenter.

REBUILDING THE FIRMWARE (OPTIONAL)
The HEX file is supplied; Arduino IDE is not needed to run the demo. To edit the sketch, open
Arduino Code\MOSFET_Demo\MOSFET_Demo.ino, select Arduino Uno and use Sketch > Export Compiled
Binary. Replace the simulation's .hex with the exported HEX. The sketch needs 3,514 bytes of flash
and 287 bytes of RAM.

MODEL SCOPE AND LIMITS
Modelled: the channel with its threshold, the triode and saturation regions, channel-length
modulation, the drain resistance, the gate capacitance,
the body diode, the junction temperature through the heatsink, the failure.
Not modelled: the Miller plateau and the gate-drain capacitance, the switching losses, avalanche.

VERSION
TEP N-MOSFET library V1.0 (Nov 2026). Devices IRLZ44NTEP, IRFZ44NTEP and Q2N7000TEP (TEPNMOS.LIB /
TEPNMOS.DLL). Demo sketch MOSFET_Demo V1.0. Demo board: ARDUINO UNO V4.0 (TEP Arduino Library V4.0)
with its built-in serial monitor.