IRLZ44N (full model name: IRLZ44NPbF) is a high-performance N-channel HEXFET power MOSFET launched by International Rectifier (later acquired by Infineon). Leveraging its 5th-generation advanced process, it achieves an ultra-low on-resistance of 0.022Ω (@VGS=10V), while boasting high current-carrying capabilities of 47A continuous drain current (@25°C) and 160A pulsed current. It also features advantages such as fast switching speed, full avalanche rating, and a wide operating temperature range of -55°C to +175°C, making it widely applicable in industrial and commercial scenarios including switching power supplies, motor drives, and LED control. Its TO-220AB package combines low cost with excellent thermal performance, making it an ideal choice that balances efficiency and reliability.
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I.Basic Overview of IRLZ44N
1. Device Introduction (Overview of the IRLZ44N)
IRLZ44N (full name: IRLZ44NPbF) is a 5th-generation HEXFET power MOSFET launched by International Rectifier. It adopts advanced process technology, achieving extremely low on-resistance per silicon area. This device is a logic-level gate drive type power MOSFET, featuring fast switching speed, ruggedized device design, and full avalanche rating, among other characteristics. It can provide efficient power control solutions for various application scenarios.
It uses the TO-220AB package, which is widely recognized in commercial and industrial applications with a power dissipation level of approximately 50 watts. This is due to its advantages of low thermal resistance and low packaging cost, enabling the device to achieve a good balance between thermal performance and cost-effectiveness.
2. Manufacturer Information
The IRLZ44N is developed and manufactured by International Rectifier (abbreviated as IR). Founded in 1947 and originally headquartered in Los Angeles, California, USA, the company is one of the pioneers and leading enterprises in the global power semiconductor industry. It has long focused on the research, development, design, and manufacturing of power management semiconductor devices and related solutions.
IR is renowned for its innovative technologies, with profound technical accumulation particularly in core product fields such as power MOSFETs, IGBTs, rectifiers, and power controllers. Its proprietary HEXFET® power MOSFET technology, in particular, stands as an industry benchmark. With features like low on-resistance and high switching speed, it has greatly promoted the efficiency improvement of power electronic systems. The company’s products widely cover numerous fields including automotive electronics (e.g., new energy vehicle powertrains, on-board power supplies), industrial control (motor drives, power conversion), consumer electronics (home appliance power supplies, adapters), and renewable energy (photovoltaic inverters, wind power converters). It provides global customers with a full range of power solutions from discrete devices to integrated modules.
In 2015, International Rectifier was acquired by Infineon Technologies, becoming a key part of Infineon’s power semiconductor business. However, its technical accumulation and product portfolio in the power device field have been continued, and it continues to provide high-performance power semiconductor devices to the market—including classic power MOSFETs like the IRLZ44N based on HEXFET technology—maintaining wide recognition and influence in the industry.
II. Core Attributes and Specifications of IRLZ44N
Key Attributes (Attributes of the IRLZ44N)
- Type: N-channel power MOSFET
- Package type: TO-220AB
- Gate drive type: Logic-level gate drive
- Environmental characteristics: Lead-Free, compliant with environmental requirements
- Operating temperature range: Junction temperature TJ=−55 to +175∘C; storage temperature range is consistent with the junction temperature range
- Core advantages: Low on-resistance, fast switching speed, full avalanche rating, suitable for high-efficiency power control scenarios
Electrical Performance Parameters
| Parameter |
Value |
Conditions |
| Drain-Source Voltage (VDSS) |
55V |
- |
| Gate-Source Voltage (VGS) |
±16V |
- |
| On-Resistance (RDS(ON)) |
0.022Ω |
VGS=10V |
| Continuous Source Current (Body Diode, IS) |
47A |
TJ=25∘C |
| Pulsed Source Current (Body Diode, ISM) |
160A |
- |
| Diode Forward Voltage (VSD) |
Max 1.3V |
TJ=25∘C,IS=25A,VGS=0V |
| Reverse Recovery Time (trr) |
Typ 80ns, Max 120ns |
TJ=25∘C,IF=25A |
| Reverse Recovery Charge (Qrr) |
Typ 210nC, Max 320nC |
di/dt=100A/μs |
Thermal Performance Parameters
| Parameter |
Value |
| Junction-to-Case Thermal Resistance (RθJC) |
Max 1.4°C/W |
| Case-to-Heatsink Thermal Resistance (Flat, Greased Surface, RtCS) |
Typ 0.50°C/W |
| Junction-to-Ambient Thermal Resistance (RθJA) |
Max 62°C/W |
| Linear Derating Factor |
0.71W/°C |
Absolute Maximum Ratings
| Parameter |
Value |
Conditions |
| Continuous Drain Current (ID) |
47A |
TC=25∘C,VGS=10V |
| |
33A |
TC=100∘C,VGS=10V |
| Pulsed Drain Current (IDM) |
160A |
- |
| Power Dissipation (PD) |
110W |
TC=25∘C |
| Single-Pulse Avalanche Energy (EAS) |
210mJ |
- |
| Avalanche Current (IAR) |
25A |
- |
| Repetitive Avalanche Energy (EAR) |
11mJ |
- |
| Peak Diode Recovery dv/dt |
5.0V/ns |
- |
| Soldering Temperature |
300°C |
1.6mm from case, 10s duration |
| Mounting Torque |
10lbf-in (1.1N-m) |
For 6-32 or M3 screws |
III. IRLZ44N Pins and Package
1. IRLZ44N Pin Configuration
The IRLZ44N adopts the TO-220AB package. For the HEXFET type, its pin assignments are as follows:
The IRLZ44NPbF adopts the TO-220AB package. For the HEXFET type, its pin assignments are as follows:
- Pin 1: Gate (GATE, G)
- Pin 2: Drain (DRAIN, D)
- Pin 3: Source (SOURCE, S)
- Pin 4: Drain (DRAIN, D)
The pin layout of this package conforms to the JEDEC standard TO-220AB specification. Both Pin 4 and Pin 2 serve as drains, which can enhance current-carrying capacity and optimize heat dissipation performance. The package dimensions are controlled in inches (with supplementary millimeters 标注), and key dimensions include pin spacing, device length, etc. (for details, refer to the "TO-220AB Package Outline" section in the document). It is clearly specified that the measurements of the heatsink and pins do not include burrs to ensure installation compatibility.
This pin configuration is designed to be suitable for logic-level drive scenarios, facilitating direct connection with microcontrollers and driver circuits. Meanwhile, the multi-drain pin design improves power handling capability, making it suitable for PCB layout and heat dissipation design in high-current applications.
2. CAD Model of IRLZ44N
IV. Performance Advantages and Applications of IRLZ44N
1. Advantages of IRLZ44N
- Low conduction loss: The ultra-low on-resistance (RDS(ON)=0.022Ω) significantly reduces power loss during high-current operation, improving system efficiency.
- Fast switching characteristics: Rapid switching speed makes it suitable for high-frequency applications, minimizing energy loss during switching transitions and enhancing overall system performance.
- High current handling capability: With a continuous drain current of up to 47A (at 25°C) and a pulsed drain current of 160A, it meets the demands of various high-current power control scenarios.
- Fully avalanche-rated: Rated for both single-pulse and repetitive avalanche energy, it enhances reliability in inductive load switching applications and reduces the risk of damage from avalanche effects.
- Logic-level gate drive: Compatible with logic-level signals, enabling direct interfacing with microcontrollers and logic circuits, simplifying driver circuit design.
- Excellent thermal performance: The TO-220AB package, combined with low thermal resistance, facilitates efficient heat dissipation, ensuring stability during high-power operation.
- Lead-free and environmentally friendly: Complies with lead-free standards, making it suitable for applications with strict environmental requirements.
2. Typical Applications of the IRLZ44N
Leveraging its superior performance, the IRLZ44N is widely used in the following fields:
- Switching power supplies: Employed in DC-DC converters and AC-DC power supplies for efficient power conversion and voltage regulation.
- Motor control: Suitable for driving DC motors and stepper motors, providing high current output for rapid start-stop and speed adjustment.
- Lighting systems: Used in LED drivers and fluorescent lamp ballasts to achieve precise brightness control and efficient power supply.
- Battery management: Functions as a switching device in battery charge-discharge management circuits to protect batteries and system components.
- Power amplification: Serves as a power switching device in audio and RF power amplifiers.
- Automotive electronics: Applicable to various power control modules in vehicles.
V. IRLZ44N Circuit Overview and Alternative Solutions
1. RLZ44N Circuit Overview
The IRLZ44N, as a logic-level N-channel HEXFET power MOSFET, is primarily utilized in circuits for its high-efficiency switching capabilities. Its circuit applications are designed to leverage its key characteristics—low on-resistance, fast switching speed, and robust avalanche performance—across various scenarios. Below is an overview of typical circuit configurations and design considerations:
Basic Switching Circuit
The core application of the IRLZ44N is as a power switch in circuits controlling loads such as motors, LEDs, or power converters. A simplified basic circuit includes:
- IRLZ44N as the switching device: The drain (D) connects to the load, the source (S) to ground, and the gate (G) to a logic-level driver (e.g., microcontroller or gate driver IC).
- Gate drive signal: A voltage of 5–10V at the gate turns the MOSFET on (low drain-source resistance, RDS(ON)=0.022Ω), allowing current to flow through the load. A 0V signal turns it off (high resistance, blocking current).
- Protection components: Optional gate resistors to limit gate current and suppress ringing, and flyback diodes for inductive loads (e.g., motors) to clamp voltage spikes during switching.
Key Test Circuits
Several specialized test circuits are used to characterize the IRLZ44N’s performance, as referenced in the datasheet:
- Switching Time Test Circuit (Fig. 10a):
This circuit measures turn-on (ton) and turn-off (toff) times, rise time (tr), and fall time (tf). It includes a 5.0V gate drive, a supply voltage (VDD), and the device under test (DUT). Waveforms (Fig. 10b) show the relationship between gate voltage (VGS) and drain-source voltage (VDS) during switching, confirming fast transition speeds critical for high-frequency applications.
- Unclamped Inductive Test Circuit (Fig. 12a):
Designed to evaluate the MOSFET’s avalanche ruggedness, this circuit includes an inductor, gate resistor (RG), and supply voltage (VDD). When the IRLZ44N turns off, stored energy in the inductor forces the drain voltage to rise above VDSS, triggering avalanche breakdown. Waveforms (Fig. 12b) capture the avalanche current (IAS) and voltage (VDS), verifying compliance with rated single-pulse (EAS=210mJ) and repetitive (EAR=11mJ) avalanche energy.
- Gate Charge Test Circuit (Fig. 13b):
- This setup measures gate charge parameters (QG, QGS, QGD) using a current regulator, capacitors, and sampling resistors. The gate charge waveform (Fig. 13a) illustrates the charge required to turn the MOSFET on, guiding the design of gate drive circuits to ensure fast and stable switching.
Design Considerations
- Parasitic Effects: High-frequency switching (e.g., in DC-DC converters) requires careful PCB layout to minimize stray inductance/capacitance. Short, thick traces for the drain and source reduce parasitic inductance, while ground planes limit noise.
- Gate Drive Design: The gate resistor (RG) balances switching speed and EMI: a smaller RG speeds up switching but increases noise, while a larger RG slows transitions but reduces ringing. Logic-level compatibility (5–10V gate voltage) allows direct interfacing with microcontrollers, simplifying circuit integration.
- Thermal Management: With a maximum power dissipation of 110W (TC=25∘C) and junction-to-case thermal resistance (RθJC) of 1.4°C/W, heatsinks are often required for high-current applications. The case-to-sink thermal resistance (typical 0.50°C/W for a greased surface) should be considered to keep the junction temperature (TJ) below 175°C.
- Protection for Inductive Loads: For loads like motors or transformers, the IRLZ44N’s intrinsic body diode (with a forward voltage VSD≤1.3V at 25A) provides reverse recovery capability, but external diodes may be added for enhanced protection in high-voltage scenarios.
In summary, the IRLZ44N’s circuit versatility stems from its ability to handle high currents, switch efficiently, and withstand harsh conditions—making it suitable for power supplies, motor drives, and LED controllers where reliability and efficiency are critical.
2. Substituting the IRLZ44N
When replacing the IRLZ44N, the following factors must be comprehensively evaluated to ensure proper operation of the alternative device:
- Electrical parameter matching: Key parameters such as VDSS, RDS(ON), and ID must meet or exceed the original specifications to handle application voltage, current, and power requirements. For example, the alternative’s VDSS must be ≥ the maximum operating voltage, and ID must withstand the maximum operating current.
- Package compatibility: The alternative should use the same package (e.g., TO-220AB) for direct PCB mounting without design modifications. If the package differs, check fit, form, and heat dissipation compatibility.
- Gate drive requirements: Differences in gate charge (QG) and threshold voltage (VGS(TH)) may exist; ensure the driver circuit provides sufficient voltage and charge for reliable turn-on/off.
- Thermal performance matching: The alternative’s thermal resistance should be comparable to or better than the IRLZ44N to prevent excessive junction temperature under the same power dissipation, with re-evaluation of thermal design if necessary.
- Reliability and application suitability: Parameters like avalanche energy and dv/dt must meet.
3. Alternative Options for IRLZ44N
- IRF1010 Series (E/EZ/N/Z): With a voltage rating of 60V and an on-resistance as low as 8.0mΩ, they feature a large continuous current and are suitable for low-voltage, high-current scenarios. Models with the Z suffix have optimized performance and lower switching losses.
- IRF1018E: Boasting a 100V voltage rating, fast switching speed, and excellent reverse recovery characteristics, it is ideal for high-frequency switching circuits such as DC-DC converters.
- IRF1405/1405Z: Rated at 55V, with an on-resistance of 4.5mΩ and a continuous current of 169A. The Z model offers higher efficiency and is applicable to high-current power control.
- IRF1407: With a 75V voltage rating and a current of 130A, it balances voltage and current requirements, making it suitable for medium-power motor drives.
- IRF1607: Featuring a 100V voltage rating and an on-resistance of 7.0mΩ, it excels in high-frequency performance and is suitable for high-frequency inverter circuits.
- IRF2805/2807 Series: The 2805 has a 55V voltage rating and a 209A current; the 2807 has a 75V voltage rating and a 180A current. Models with the Z suffix have optimized on-resistance and are suitable for high-power equipment.
- IRF2907Z: With a 75V voltage rating and enhanced avalanche characteristics, it is suitable for inductive load scenarios and offers high reliability.
- IRF3007: Rated at 100V with a current of 130A, it has good thermal stability and is suitable for continuous high-power applications.
- IRF3205/3205Z: With a 55V voltage rating, an on-resistance of 8.0mΩ, and a current of 110A, they offer high cost performance. The Z model has a faster switching speed.
- IRF3305: Boasting a 60V voltage rating and a 140A current, it has strong surge resistance and is suitable for power control in harsh environments.
- IRF3710Z: With a 100V voltage rating and a pulsed current of 440A, it has outstanding short-term load capacity and is suitable for transient high-power scenarios.
Conclusion
In summary, the IRLZ44N, as a 5th-generation HEXFET power MOSFET, demonstrates exceptional efficiency and reliability in the field of power control through its ultra-low on-resistance of 0.022Ω, 47A continuous drain current, 160A pulsed current-carrying capability, as well as full avalanche rating and a wide operating temperature range of -55°C to 175°C. Its TO-220AB package balances thermal performance and cost advantages, while its logic-level gate drive design simplifies integration with microcontrollers—making it widely applicable in industrial and commercial scenarios such as switching power supplies, motor drives, and LED control. Whether for the pursuit of high efficiency or the requirement for stability in complex environments, the IRLZ44N can provide reliable solutions, serving as an ideal choice for engineers in power electronics design that combines practicality and cost-effectiveness.
