The 3034 MOSFET is commonly marked as IRLB3034 or IRLB3034Pbf. This is a powerful HEXFET N-channel type and comes in TO-220 packaging. In this article, I’m sharing the pinout, Equivalent MOSFETs for replacement, testing guide using multimeter and its specifications.
What is the IRLB3034 MOSFET?
IRLB3034 MOSFET is a 40V, 195 – 345A HEXFET comes in TO-220 packaging. This MOSFET has ultra low on-Resistance and higher current handling capacity. So this MOSFET is common in UPS systems and Heavy motor driver circuits.
IRLB3034 Pinout Diagram
IRLB3034 Pin Configuration
To check the pinout of this MOSFET, you need to keep the MOSFET numbering facing you and the pins are pointing downward. Then count the pin from left to right as Pin 1, 2, and 3. The corresponding pin name is given in the table below,
| Pin Number | Pin Name |
|---|---|
| Pin 1 | Gate (G) |
| Pin 2 | Drain (D) |
| Pin 3 | Source (S) |
| Metal Tab | Drain (D) |
IRLB3034 Features
- Ultra low on Resistance and less power loss and heat generation.
- High current handling capacity of 195A and around 1372 amps in pulsed mode.
IRLB3034 Technical Specifications
- Drain-to-Source Voltage is 40V
- Gate to Source Voltage 20V
- Continuous Drain Current in Package limited is 195A and 343A in Silicon limited.
- Pulsed Drain Current is 1372A
- Maximum Power Dissipation is 375W
IRLB3034 MOSFET Equivalents as Replacement
You can use IRFB3034, it uses same die and specifications. The other close substitutes are PP015N04N by Infineon, PSMN1R9-40PL by Nexperia and IRLZ44N by Infineon (47A less current handling). Other MOSFETS are IRLB3036, IRLB3813 and IRL40B209.
How to Test the IRLB3034 MOSFET Using a Multimeter
To check whether the diode is working well or not using a multimeter, you need to set the multimeter knobs to diode mode and make the connections to check. The connections and expected readings are given in the table below,
| Step | Multimeter Probe Connection | Expected Reading | Result |
|---|---|---|---|
| 1 | Connect Red probe to Source (S) and Black to Drain (D) | Body diode voltage drop (approximately 0.4V–0.8V) | ✅ Good |
| 2 | Red to Drain (D) and Black to Source (S) | OL (Open Loop) | ✅ Good |
| 3 | Touch Red in Gate (G) and Black to Source (S) for 2 to 3 seconds. This is for charge the gate. | Gate charges | — |
| 4 | Then connect Black probe to Drain (D) and Red to Source (S) | Low reading or continuity (MOSFET turns ON) | ✅ Good |
| 5 | Short the Gate (G) and Source (S) together to discharge the gate | Now MOSFET turns OFF | — |
| 6 | Then connect Black to Drain (D) and Red to Source (S) | OL (No continuity) | ✅ Good |
Common Applications of the IRLB3034 MOSFET
- Used to control brushed DC motors in robotics.
- Used in SMPS for synchronous rectification.
- Using in battery charging, discharging, and protection switching.
- Suitable for PWM-based switching applications.
