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Infineon Technologies IRFL4105PBF
- Part No.:
- IRFL4105PBF
- Manufacturer:
- Infineon Technologies
- Category:
- FETs, MOSFETs
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
IRFL4105PBF.pdf
- Description:
- MOSFET N-CH 55V 3.7A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,041
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Product details
Overview
IRFL4105PBF from Infineon is a 55 V, 3.7 A N-channel enhancement-mode power MOSFET in SOT-223 package, featuring 45 mΩ RDS(on) at VGS = 10 V and 1.0 W PCB-mount power dissipation. It serves as a high-efficiency, surface-mount switching device in DC-DC converters, LED drivers, and load-switching circuits where thermal performance and fast switching are critical.
For engineers reviewing the IRFL4105PBF datasheet, IRFL4105PBF pinout, IRFL4105PBF application, or IRFL4105PBF equivalent, key selection criteria include its 55 V VDS, 45 mΩ on-resistance at 3.7 A, 23 nC total gate charge, avalanche-rated ruggedness, and SOT-223 thermal design suitability for space-constrained PCBs.
Technical Context
This HEXFET® device uses advanced silicon processing to minimize conduction loss while maintaining robust unclamped inductive switching capability-rated for 110 mJ single-pulse avalanche energy at TJ = 25°C with IAS = 3.7 A. Its body diode supports reverse recovery times of 55–82 ns and Qrr of 120–170 nC under defined di/dt conditions.
The MOSFET operates across –55°C to +150°C junction temperature range, with gate threshold voltage (VGS(th)) specified from 2.0 V to 4.0 V and dynamic dv/dt immunity up to 5.0 V/ns-enabling reliable operation in noisy industrial switching environments without spurious turn-on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 55 V - maximum blocking voltage before breakdown; defines safe operating range in 24–48 V systems |
| RDS(on) | 0.045 Ω @ VGS = 10 V, ID = 3.7 A - enables <165 mW conduction loss at rated current |
| ID (continuous) | 3.7 A @ TA = 25°C - usable continuous current with standard PCB mount and no heatsink |
| Qg | 23 nC (typ) - determines gate drive power and switching speed in PWM applications |
| EAS | 110 mJ - quantifies energy-handling capability during inductive turn-off transients |
| trr / Qrr | 55–82 ns / 120–170 nC - impacts commutation loss and EMI in synchronous rectification |
| RθJA | 90 °C/W (PCB mount) - sets junction-to-ambient thermal rise per watt; limits max power to ~1.0 W at 70°C ambient |
Pinout & Package
SOT-223 (TO-261AA) surface-mount package with exposed drain tab for enhanced thermal conduction to PCB copper. Standard footprint compatible with automated pick-and-place; tab soldered to large copper pour improves thermal resistance by ~30% vs. SOIC-8 equivalents.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Gate) | Control input | Receives logic-level or driver signal; requires ≥10 V for full enhancement; gate leakage <100 nA |
| 2 (Drain) | High-side switch node | Connected to load supply rail; electrically tied to exposed metal tab for heat sinking |
| 3 (Source) | Return path / reference | Common return for load current; forms source terminal of internal body diode |
| 4 (Tab/Drain) | Thermal & electrical connection | Internally bonded to Drain; must be soldered to PCB copper for rated power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low RDS(on) | 0.045 Ω enables <165 mW conduction loss at 3.7 A, reducing thermal stress in compact layouts |
| Fully avalanche-rated | 110 mJ single-pulse energy rating allows safe operation under inductive load switching without external snubbers |
| Fast switching | 7.1 ns td(on), 12 ns tr, 19 ns td(off) support >500 kHz PWM in DC-DC regulators |
| Lead-free & RoHS-compliant | Pb-free plating and halogen-free molding compound meet IPC/JEDEC J-STD-020 reflow requirements |
| Dynamic dv/dt immunity | Rated 5.0 V/ns - suppresses false turn-on during high-slew-rate voltage transients in motor drives |
Applications
| DC-DC Buck Converter | LED Constant-Current Driver |
|---|---|
Use Scenario: Step-down regulation from 24 V to 5 V/3.3 V in industrial control modules. IC Role / Device Role / Timing Role: High-side synchronous rectifier switch operating at 300–500 kHz. Use Value: 45 mΩ RDS(on) minimizes I²R loss; 23 nC Qg enables efficient gate drive with low-power controllers. | Use Scenario: Constant-current dimming of high-brightness white LEDs in signage and lighting fixtures. IC Role / Device Role / Timing Role: Low-side PWM switch controlling LED string current up to 3.7 A. Use Value: Avalanche rating protects against inductive kickback from LED string parasitics; SOT-223 footprint simplifies layout in tight spaces. |
| Load Switch for 12 V Systems | Automotive Accessory Power Control |
Use Scenario: Controlled power delivery to USB hubs, sensors, or actuators in embedded systems. IC Role / Device Role / Timing Role: Single-N-channel high-side switch with integrated gate resistor network. Use Value: 55 V rating accommodates load dump transients; 1.0 W thermal limit supports 3.7 A with minimal copper area. | Use Scenario: Power management for infotainment peripherals in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Protected load switch handling intermittent loads with surge current tolerance. Use Value: Fully rated for 150°C junction operation; body diode reverse recovery (55 ns) reduces switching noise in noisy vehicle environments. |
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 |
|---|---|---|---|
| DMN3020LSD-13 | 30 V VDS, 20 mΩ RDS(on), SOT-23-3 package, lower voltage rating | Limited to ≤24 V systems; unsuitable for 48 V or load-dump tolerant designs | Select only when system VIN ≤24 V and board space is extreme constraint |
| IPD25N04S4-05 | 40 V VDS, 5.0 mΩ RDS(on), TO-252 package, higher current (25 A) | Requires larger footprint and heatsinking; over-specified for low-current SOT-223 use cases | Prefer when >5 A continuous current or >2 W dissipation is required |
Compared with DMN3020LSD-13 and IPD25N04S4-05, IRFL4105PBF uniquely balances 55 V rating, SOT-223 thermal capability, and 45 mΩ on-resistance-making it optimal for 24–48 V industrial switching where size, ruggedness, and efficiency intersect.
Availability
IRFL4105PBF is available at Aetrix Electronics and suitable for DC-DC converters, LED drivers, load switches, and automotive accessory controls requiring stable component supply and long-term industrial availability.
Supply support for IRFL4105PBF 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 German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs and discrete devices.
The IRFL4105PBF belongs to Infineon's HEXFET® Power MOSFET product line, engineered for high-efficiency, surface-mount switching in space-constrained industrial and automotive power systems.
FAQ
Is IRFL4105PBF suitable for 48 V battery-powered applications?
Yes. With a 55 V VDS rating and 110 mJ avalanche energy, IRFL4105PBF safely handles 48 V nominal systems including transient overvoltages up to 55 V. Its RDS(on) remains stable across –55°C to +150°C, supporting operation in battery enclosures with wide thermal swings.
What is the recommended PCB layout for thermal performance?
Maximize copper area connected to the drain tab (Pin 2 and exposed pad), using ≥2 oz copper and multiple thermal vias to inner ground planes. Maintain ≥0.5 mm clearance from other components. A 100 mm² copper pour reduces RθJA from 90°C/W to ~60°C/W, enabling ~1.5 W dissipation at 70°C ambient.
Does IRFL4105PBF require a gate resistor for stability?
A series gate resistor (6–10 Ω) is recommended to dampen ringing caused by gate-drain capacitance (Crss = 99 pF) and PCB inductance. This improves EMI and prevents unintended oscillation during fast edge transitions, especially when driven by microcontrollers without dedicated gate drivers.
Can IRFL4105PBF replace older IRFL4104 in existing designs?
Yes-IRFL4105PBF is a direct drop-in replacement for IRFL4104 with identical SOT-223 pinout and improved specs: lower RDS(on) (45 mΩ vs. 55 mΩ), higher ID (3.7 A vs. 3.3 A), and enhanced avalanche rating (110 mJ vs. 85 mJ). No layout or firmware changes are needed.
IRFL4105PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- HEXFET®
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 55 V
- Current - Continuous Drain (Id) @ 25°C:
- 3.7A (Ta)
- Drive Voltage (Max Rds On, Min Rds On):
- 10V
- Rds On (Max) @ Id, Vgs:
- 45mOhm @ 3.7A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 35 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 660 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 1W (Ta)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
IRFL4105PBF FAQ
1.How can I place an order for IRFL4105PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRFL4105PBF 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 IRFL4105PBF reliable?
The price and inventory of IRFL4105PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRFL4105PBF is usually 5 days.
3.What payment methods are accepted for IRFL4105PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRFL4105PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRFL4105PBF?
IRFL4105PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRFL4105PBF 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 IRFL4105PBF?
For technical support, including IRFL4105PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRFL4105PBF requirements.
6.How does Aetrix verify that IRFL4105PBF is sourced from the original manufacturer or authorized distributors?
All IRFL4105PBF 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 IRFL4105PBF meets industry standards.
7.What is the process for return or replacement of IRFL4105PBF?
All IRFL4105PBF units undergo pre-shipment inspection (PSI). If there is an issue with IRFL4105PBF, 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 IRFL4105PBF part is unused and in its original packaging.
Return procedure for IRFL4105PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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