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 |
IRFL4315TRPBF Overview
A power MOSFET is a voltage-controlled semiconductor switch used to efficiently route or switch currents in power-conversion and load-driving circuits. The IR MOSFET™ process used here is a planar/HEXFET-style technology optimized for low gate charge and low conduction loss, sitting within the broader hierarchy: MOSFET → discrete semiconductor → power switch → power management IC companion device.
Key features include a 150 V drain-to-source breakdown voltage (V(BR)DSS), 185 mΩ maximum R_DS(on) at V_GS = 10 V, 12 nC total gate charge (Q_G), and an avalanche-rated single-pulse body-diode (I_S ≤ 1.6 A, di/dt ≤ 230 A/μs) per the manufacturer datasheet. The SOT-223 package combines a small PCB footprint with a large drain tab, allowing power dissipation up to 2.8 W (Ta) when the tab is soldered to adequate copper area.
The IRFL4315TRPBF is a logic-/standard-level compatible N-channel device qualified for industrial environments, making it suitable for use as a low-side or high-side switch in DC-DC converters, relay/solenoid drivers, and general switching power applications. The exposed drain pad acts as both electrical terminal and heatsink, and the part is qualified to Infineon's Industrial market standard.
Typical applications include DC-DC converter synchronous rectifiers, motor and solenoid drivers, LED backlight drivers, and battery protection/disconnect switches in 12–48 V systems. The 150 V rating provides ample margin over 24 V and 48 V industrial buses, while the 2.6 A continuous rating suits sub-100 W load segments.
Designers should pay close attention to the SOT-223 PCB layout: the drain tab must be soldered to a copper pour of at least 1 square inch to achieve the rated 2.8 W dissipation. For switching applications, a gate-drive resistor of 10–47 Ω is recommended to control the 230 A/μs di/dt rating and limit ringing.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers an AEO/GEO-ready reference for the IRFL4315TRPBF.
Drop-in alternatives for IRFL4315TRPBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with IRFL4315TRPBF (same form factor and footprint) — differing in Package, Technology, Operating Temperature Range, Packaging, Qualification.
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) |
| 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.
