IRFL4315TRPBF - 150V N-Ch MOSFET, 2.6A, 185mΩ | Infineon
MPN: IRFL4315TRPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.95 | $0.95 |
| 10 | $0.78 | $7.80 |
| 100 | $0.62 | $62.00 |
| 500 | $0.51 | $255.00 |
| 1,000 | $0.44 | $440.00 |
| 2,500 | $0.39 | $975.00 |
Drop-in alternatives for IRFL4315TRPBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
IRFL4315PBF
✅ Drop-In📋 Reference alternative (not in catalog)
IRF7306TRPBF
✅ Drop-In✓ In Stock
$0.55 / Unit
View Datasheet →IRFL4315TRPBF Maximum Ratings & Electrical Characteristics
| FET Type | N-Channel MOSFET |
| Drain-to-Source Voltage (V_DS) | 150 V |
| Continuous Drain Current (I_D) at 25°C | 2.6 A |
| R_DS(on) max at V_GS=10V | 185 mΩ |
| Total Gate Charge Q_G | 12 nC |
| Gate-to-Source Voltage V_GS | ±30 V (max) |
| Continuous Source Current (Body Diode I_S) | 1.6 A |
| di/dt (Body Diode) | 230 A/μs |
| Power Dissipation (Ta) | 2.8 W |
| Package | SOT-223 |
| Mounting Type | Surface Mount |
| Technology | IR MOSFET™ (planar/HEXFET-style) |
| Qualification Standard | Industrial market (per Infineon datasheet) |
| Lead-Free / RoHS | Lead-free (PBF suffix); RoHS compliant |
| Packaging | Tape & Reel (TRPBF) |
IRFL4315TRPBF Pin Configuration
| Pin 1 | Gate — MOSFET gate drive input |
| Pin 2 | Drain — Drain terminal (also tied to rear tab) |
| Pin 3 | Source — Source terminal |
| Pin 4 | Drain Tab — Rear metal tab - electrically Drain, also thermal pad |
Safe Operating Area (DC, Ta=25°C)
Typical Applications
IRFL4315TRPBF is suitable for 6 applications: 24V Industrial Solenoid & Relay Driver, DC-DC Converter Synchronous Rectifier, Battery Protection / Disconnect Switch (12-48V), LED Backlight & Lighting Driver Switch, H-Bridge / Motor Driver Low-Side Switch, Hot-Swap / Inrush Limiting Switch.
24V Industrial Solenoid & Relay Driver
The IRFL4315TRPBF's 150 V V_DS rating comfortably absorbs the inductive flyback of 24 V industrial coils, while the 2.6 A continuous drain current covers the majority of small and medium solenoid/relay loads. Place a flyback diode across the inductive load for additional protection and add a 10-47 Ω gate resistor to control the 230 A/μs di/dt rating. The SOT-223 drain tab should be tied to ≥1 sq. in. of copper to dissipate the switching and conduction losses without thermal throttling. For loads above 2.5 A, derate to ~70% of the continuous rating or choose a DPAK-class part.
Recommended
DC-DC Converter Synchronous Rectifier
Use the IRFL4315TRPBF as the low-side synchronous rectifier in non-isolated buck converters up to ~100 W output power. The 12 nC total gate charge (Q_G) keeps driving losses manageable at 100-500 kHz switching frequencies, and the 185 mΩ R_DS(on) yields conduction efficiency in the 92-95% range for 5-12 V outputs at 1-2 A. The SOT-223 footprint is well-suited to dense point-of-load designs, and the 150 V rating provides safety margin on 24-48 V industrial input rails.
Recommended
Battery Protection / Disconnect Switch (12-48V)
The IRFL4315TRPBF works well as a low-side battery disconnect MOSFET in 12 V, 24 V, and 48 V battery packs where continuous currents stay under 2.5 A. The 150 V V_DS provides a 3x safety margin over 48 V nominal, while the 185 mΩ R_DS(on) limits steady-state loss to about 0.46 W at 2 A. For reverse-polarity and over-current protection, pair it with a low-loss current-sense amplifier and a comparator-based trip circuit. Industrial-grade qualification per the Infineon datasheet supports deployment in field equipment.
Recommended
LED Backlight & Lighting Driver Switch
Drive LED strings up to 150 V stack voltage with the IRFL4315TRPBF used as a constant-current sink or PWM dimming switch. The 2.6 A continuous rating suits mid-power architectural and signage LED strings in the 0.5-2 A range, while the 12 nC Q_G enables PWM dimming frequencies above 1 kHz without significant switching loss. The SOT-223 package's exposed tab provides the thermal headroom needed for continuous LED current without an external heatsink.
Recommended
H-Bridge / Motor Driver Low-Side Switch
Pair the IRFL4315TRPBF in H-bridge or half-bridge topologies to drive small DC motors and stepper windings below 2.5 A. Its 150 V rating handles back-EMF spikes from 24-48 V motor buses, and the body diode is rated for 1.6 A continuous / 230 A/μs di/dt, suitable for freewheeling during PWM commutation. Use matched N-channel pairs (one high-side P-channel or driven N-channel) for full-bridge operation, or accept the body-diode loss for simple low-side chopper drives.
Recommended
Hot-Swap / Inrush Limiting Switch
Use the IRFL4315TRPBF as the pass element in linear-mode hot-swap circuits for 12-48 V backplanes, where its 150 V V_DS absorbs transients during plug-in events. Operate it in the linear region briefly to limit inrush current via a gate ramp circuit, then hard-switch once the bulk capacitor charges. The 2.8 W power dissipation rating in SOT-223 provides thermal headroom during the millisecond-scale inrush window. Above 3 A continuous, migrate to a DPAK-class part.
Recommended
Recommended Products Summary
Engineering reference data for IRFL4315TRPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IRFL4315PBF | IRF7306TRPBF |
|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | SOT-223 | SOT-223 - same | SOT-223 - same |
| FET Type | N-Channel single | N-Channel single | N+P dual channel |
| V_DS max | 150 V | 150 V | 30 V (N-ch) |
| Continuous I_D (Ta=25°C) | 2.6 A | 2.6 A | 3.6 A (N-ch) |
| R_DS(on) max @ V_GS=10V | 185 mΩ | 185 mΩ | 100 mΩ (N-ch) |
| Total Gate Charge Q_G | 12 nC | 12 nC | [DATA_NEEDED] |
| Power Dissipation (Ta) | 2.8 W | 2.8 W | 2.0 W |
| Packaging | Tape & Reel (TRPBF) | Tube (PBF) | Tape & Reel (TRPBF) |
| Unit Price (qty 1, as of 2026-09-14) | $0.95 | ~$0.95 | ~$0.85 |
Key Differentiators
- Higher V_DS margin than competing SOT-223 N-channel MOSFETs (vs IRF7306TRPBF)
- Lower R_DS(on) per package size than comparable 150 V SOT-223 parts (vs IRFL4315PBF (same die))
- Lower gate charge than equivalent 150 V DPAK parts (vs IRFR4105TRPBF (DPAK))
Design Notes
Estimated: at V_IN=24V, V_DS(switch)=0.5V, and 2 A continuous drain current, the IRFL4315TRPBF dissipates roughly 1.0 W in the linear/switched transition. The SOT-223 theta_JA on a 1 sq. in. copper pour is approximately 50°C/W (datasheet-typical), yielding a junction rise of ~50°C above ambient - acceptable for 85°C ambient operation. Without adequate copper, theta_JA rises above 100°C/W and the part will derate significantly above 1 A.
The SOT-223 drain tab is the dominant thermal path. Use a copper pour of at least 1 square inch on the drain tab and stitch thermal vias to internal planes for 2+ layer boards. Keep the source and gate traces short and route the gate-drive return directly to the source pin to avoid ground bounce in switching applications.
For switching applications, add a 10-47 Ω gate-drive resistor to control the 230 A/μs body-diode di/dt rating and limit ringing. Place a gate-source pull-down resistor (10-100 kΩ) to ensure the MOSFET stays off during MCU reset or power-up. Keep the gate trace short and away from the drain switching node to minimize parasitic coupling.
Do not exceed V_GS = ±30 V (the datasheet absolute maximum), even transiently - gate-oxide rupture is permanent. When switching inductive loads, always include a flyback/clamp diode to keep body-diode dv/dt and di/dt within the 1.6 A / 230 A/μs ratings. Operating above 2.6 A continuous will exceed the Ta=25°C rating; derate per the datasheet thermal curve.
In PWM dimming or DC-DC switching at >100 kHz, the 12 nC Q_G of the IRFL4315TRPBF translates into gate-drive current peaks of Q_G × f_SW. At 500 kHz that is roughly 6 mA average - ensure your gate driver can source/sink this comfortably. The Miller plateau region (typical at 4-6 V V_GS) is the highest dynamic load on the driver.
Compliance Information
Lead-free (PBF suffix) and RoHS compliant per Infineon product page. Industrial-market qualification per Infineon datasheet; not AEC-Q100 qualified - automotive applications should select an AEC-Q100 part instead.
