IRLB4132 is a power N-channel MOSFET. In this article sharing the pinout, equivalent MOSFET for replacement, specifications, and a multimeter-based MOSFET testing guide.
What is the IRLB4132 MOSFET?
The IRLB4132 is an N-channel MOSFET and comes in TO-220 packaging. This MOSFET can handle a continuous drain current of 78A, and it gives 150A of pulsed drain current. The MOSFET has ultra-low on-resistance, so less heat generation. These MOSFETs are common in Inverter, UPS, and Motor driver circuits.
IRLB4132 MOSFET Key Features
- Low Gate Drive Requirements of 4.5 V to 10 V. So microcontroller can easily drive the MOSFET.
- Standard Packaging of through-hole TO-220is used. This package is easy to mount and less space needed to attach.
IRLB4132 MOSFET Pinout Diagram
IRLB4132 Pin Configuration
Hold the MOSFET so that the numbering is facing you and the three pins are pointing downward, then count the pins from left to right as Pin1, 2, and 3. The corresponding pins are Gate, Drain, and Source. The table below shows a clear understanding of the pin configurations,
| Pin Number | Pin name |
|---|---|
| 1 | Gate (G) |
| 2 | Drain (D) |
| 3 | Source (S) |
IRLB4132 MOSFET Specifications
- Drain-Source Voltage is 30 V
- Continuous Drain Current is 78 A and maximum drain current is 150A.
- On-Resistance is 3.5 mΩ
- Gate Threshold Voltage is 1.35 V to 2.35 V.
- Power Dissipation is Up to 140 W
- Operating Temperature is between -55° C to +175° C
How Does the IRLB4132 MOSFET Work?
The IRLB4132 is an N-channel power MOSFET. This acts as an electronic switch and can control current flow through it. When a low voltage of 3.3v to 5V is applied on the gate pin of the MOSFET, then the MOSFET turns ON, and charge flows from drain to source.
It has very ultra low internal on resistance, so the power loss and heat generation is low. When the gate voltage is stopped, the current flow stops. You can use a switching load of 30v and 78A current using this MOSFET.
IRLB4132 Equivalent MOSFETs
Direct equivalent is IRLB4030 and you can use alternatives of IRFB7545, IRFB3077, and IRF1405. Always check the pinout and specification before replacing with orginal components.
Advantages of the IRLB4132 MOSFET
- High current handling of up to 78A.
- Low internal on Resistance and less power loss.
- Lower gate threshold volt and easily control through microcontroller IC.
- Fast switching speed.
- Excellent power dissipation and themal perfoprmance.
Limitations and Design Considerations
- Maximum drain-source voltage is 30V.
- Exceeding junction temperature above 175 degree Celsius will damage the MOSFET.
- In PWM circuits >500Khz extreme frequency cause excessive power dissipation.
How to Test the IRLB4132 MOSFET Using a Multimeter
we are using Diode mode and resistance measuring mode for testing the MOSFET using multimeter. The testing method and probe connection, expected results are given in the table below,
| Step | Multimeter Mode | Probe Placement | Expected Reading | Result |
|---|---|---|---|---|
| 1 | Diode Test | Red → Drain (Pin 2) Black → Source (Pin 3) | 0.4 to 0.8 V | ✅ Good |
| 2 | Diode Test | Red → Source (Pin 3) Black → Drain (Pin 2) | OL | ✅ Good |
| 3 | Resistance (Ω) | Gate (Pin 1) ↔ Source (Pin 3) | OL or High Resistance | ✅ Good |
| 4 | Resistance (Ω) | Gate (Pin 1) ↔ Drain (Pin 2) | OL or High Resistance | ✅ Good |
| 5 | Diode Test | Charge Gate, then measure Drain ↔ Source | Low Reading / Conducts | ✅ MOSFET ON |
| 6 | Diode Test | Short Gate to Source, then measure Drain ↔ Source | OL | ✅ MOSFET OFF |
Common Applications of the IRLB4132 MOSFET
- DC to DC converter.
- Motor speed Control circuits.
- Solar charge controller and LED driver circuits.
