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Infineon Technologies IRFZ44ZPBF
- Part No.:
- IRFZ44ZPBF
- Manufacturer:
- Infineon Technologies
- Category:
- FETs, MOSFETs
- Package:
- TO-220-3
- Datasheet:
-
IRFZ44ZPBF.pdf
- Description:
- MOSFET N-CH 55V 51A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,762
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Product details
Overview
IRFZ44ZPBF from Infineon Technologies (formerly International Rectifier) is a 55V, 51A N-channel enhancement-mode HEXFET® Power MOSFET in TO-220AB package, featuring 13.9mΩ RDS(on) at VGS = 10V, 175°C maximum junction temperature, and rated repetitive avalanche capability up to IAS = 31A - used in DC-DC converters, motor drive half-bridges, and uninterruptible power supplies.
For engineers reviewing the IRFZ44ZPBF datasheet, IRFZ44ZPBF pinout, IRFZ44ZPBF application, or IRFZ44ZPBF equivalent, key selection criteria include its low conduction loss at high current, fast switching (tr = 68ns, tf = 41ns), body diode recovery performance (trr = 23–35ns), and thermal robustness under pulsed load conditions.
Technical Context
This MOSFET employs advanced silicon process technology to minimize on-resistance per die area while maintaining high avalanche energy tolerance (EAS = 86mJ, tested). Its gate charge profile (Qg = 29–43nC) supports efficient gate driving with standard 10V logic-level controllers.
The device integrates a monolithic body diode with VSD ≤ 1.2V at IS = 31A and exhibits controlled reverse recovery (Qrr = 17–26nC), enabling reliable operation in hard-switched inductive loads without external snubbers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 55V - Maximum drain-source blocking voltage; defines safe operating range in 48V bus systems. |
| RDS(on) | 13.9mΩ @ VGS = 10V - Enables <1.4W conduction loss at 51A DC, reducing heatsink requirements. |
| ID | 51A @ TC = 25°C - Continuous current rating at case temperature; derates to 36A at 100°C. |
| Qg | 43nC max - Total gate charge determines driver strength needed for 100kHz+ switching. |
| tr/tf | 68ns/41ns - Fast edge rates reduce switching losses in PWM applications like BLDC motor control. |
| EAS | 86mJ - Single-pulse avalanche energy rating ensures ruggedness during inductive turn-off transients. |
| TJ max | 175°C - High junction temperature rating allows operation in compact, thermally constrained enclosures. |
Pinout & Package
IRFZ44ZPBF uses the industry-standard TO-220AB package with isolated tab (drain-connected), suitable for screw-mount heatsinking. Pin assignment is fixed: Pin 1 = Gate, Pin 2 = Drain (tab), Pin 3 = Source.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (left) | Gate | Control terminal; requires ≥10V drive for full enhancement; Qgs = 7.2–11nC defines Miller plateau duration. |
| Pin 2 (center/tab) | Drain | Main high-side current path; electrically connected to metal tab - must be insulated from heatsink unless referenced to system ground. |
| Pin 3 (right) | Source | Power return node; internal connection to body diode cathode; referenced to gate drive common in low-side configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low RDS(on) | 13.9mΩ enables >96% efficiency in 48V/30A buck converters at 100kHz. |
| Repetitive avalanche rated | Rated for unlimited repetitive avalanche events up to IAR = 31A, eliminating need for external clamping in motor phase-legs. |
| Fast body diode | trr = 23ns typical supports synchronous rectification replacement in non-isolated SMPS topologies. |
| Lead-free & RoHS compliant | Pb-free plating and halogen-free molding compound meet IPC/JEDEC J-STD-020 reflow profiles. |
| Thermal robustness | RθJC = 1.87°C/W allows 45W dissipation with 25°C case rise - compatible with standard TO-220 heatsinks. |
Applications
| DC-DC Buck Converter | Brushless DC Motor Driver |
|---|---|
Use Scenario: 48V input to 12V/30A output in telecom power shelf. IC Role / Device Role / Timing Role: Low-side synchronous rectifier switch in fixed-frequency 200kHz buck stage. Use Value: 13.9mΩ RDS(on) reduces conduction loss by 38% vs. legacy 22mΩ MOSFETs, lowering thermal stress on PCB copper. |
Use Scenario: Half-bridge leg in 3-phase 24V BLDC controller for HVAC blowers. IC Role / Device Role / Timing Role: High-current, low-side switching element with integrated body diode conducting freewheeling current. Use Value: 31A repetitive avalanche rating tolerates back-EMF spikes during abrupt commutation, eliminating external TVS diodes. |
| Uninterruptible Power Supply | Industrial AC-DC Front-End |
Use Scenario: Battery-fed 1kVA online UPS inverter stage. IC Role / Device Role / Timing Role: Output bridge switch handling 51A peak load current with 175°C thermal margin. Use Value: 175°C TJ max permits sustained overload operation during generator transfer without derating. |
Use Scenario: PFC boost switch in 800W industrial power supply. IC Role / Device Role / Timing Role: Main switching transistor in continuous conduction mode (CCM) boost converter. Use Value: Low Qgd/Qgs ratio (12nC/7.2nC) minimizes Miller-induced shoot-through risk during high-dv/dt transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel power MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP55NF06L | RDS(on) = 14mΩ @ 10V, but lower ID = 50A and no specified EAS rating. | Lacks documented repetitive avalanche capability; unsuitable for unclamped inductive switching. | Prefer IRFZ44ZPBF where inductive energy absorption is critical. |
| IXTH50N50L2 | Higher VDSS = 500V, RDS(on) = 100mΩ - trades voltage headroom for conduction loss. | Designed for high-voltage flyback/PFC; excessive RDS(on) causes >2× conduction loss at 51A. | IRFZ44ZPBF delivers superior efficiency in 48V-class systems with tight thermal budgets. |
Compared with STP55NF06L and IXTH50N50L2, IRFZ44ZPBF uniquely balances low on-resistance, high current rating, and validated repetitive avalanche performance - making it optimal for cost-sensitive, thermally constrained 48V motor and power conversion designs.
Availability
IRFZ44ZPBF is available at Aetrix Electronics and suitable for DC-DC converters, BLDC motor drives, and uninterruptible power supplies requiring stable component supply and long-term industrial lifecycle support.
Supply support for IRFZ44ZPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies is a global semiconductor leader specializing in power management, automotive, and industrial control ICs and discrete devices, with core expertise in silicon and wide-bandgap technologies.
The IRFZ44Z series belongs to Infineon's legacy HEXFET® Power MOSFET product line, engineered for high-efficiency, high-reliability switching in medium-voltage industrial power systems.
FAQ
Is IRFZ44ZPBF suitable for logic-level gate drive?
No - IRFZ44ZPBF has a gate threshold voltage (VGS(th)) of 2.0–4.0V but requires ≥10V VGS to achieve its rated 13.9mΩ RDS(on). Driving it with 5V logic results in RDS(on) > 40mΩ and excessive conduction loss. A dedicated gate driver or level-shifter is required for full performance.
What is the maximum allowable case temperature for continuous operation?
The absolute maximum case temperature is not explicitly defined, but continuous operation is limited by thermal derating: ID drops from 51A at TC = 25°C to 36A at TC = 100°C (per Fig. 9). Sustained TC > 100°C risks exceeding 175°C junction limit unless thermal resistance is improved via enhanced heatsinking or forced airflow.
Does IRFZ44ZPBF have a built-in ESD protection diode?
No - the device lacks integrated gate protection diodes. External Zener clamping (e.g., 12V TVS between gate and source) is recommended in environments with high dv/dt or handling risk, as gate oxide breakdown occurs at ±20V VGS (absolute max rating).
Can IRFZ44ZPBF replace IRFZ44N in existing designs?
Yes - IRFZ44ZPBF is a direct drop-in replacement for IRFZ44N with identical pinout, package, and voltage/current ratings. It improves RDS(on) (13.9mΩ vs. 17.5mΩ), reduces switching losses (lower Qg and Coss), and adds explicit repetitive avalanche qualification - enhancing reliability in motor and inductive load applications.
IRFZ44ZPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- HEXFET®
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 55 V
- Current - Continuous Drain (Id) @ 25°C:
- 51A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 13.9mOhm @ 31A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 43 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 1420 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 80W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AB
IRFZ44ZPBF FAQ
1.How can I place an order for IRFZ44ZPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRFZ44ZPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for IRFZ44ZPBF reliable?
The price and inventory of IRFZ44ZPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFZ44ZPBF is usually 5 days.
3.What payment methods are accepted for IRFZ44ZPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFZ44ZPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRFZ44ZPBF?
IRFZ44ZPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRFZ44ZPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for IRFZ44ZPBF?
For technical support, including IRFZ44ZPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFZ44ZPBF requirements.
6.How does Aetrix verify that IRFZ44ZPBF is sourced from the original manufacturer or authorized distributors?
All IRFZ44ZPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IRFZ44ZPBF meets industry standards.
7.What is the process for return or replacement of IRFZ44ZPBF?
All IRFZ44ZPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRFZ44ZPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The IRFZ44ZPBF part is unused and in its original packaging.
Return procedure for IRFZ44ZPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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