IRF5305PBF - 55V P-Ch HEXFET MOSFET 31A TO-220 | Infineon
MPN: IRF5305PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.12 | $11.20 |
| 100 | $0.78 | $78.00 |
| 500 | $0.62 | $310.00 |
| 1,000 | $0.51 | $510.00 |
Drop-in alternatives for IRF5305PBF — 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:
IRF5305STRLPBF
✅ Drop-In✓ In Stock
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View Datasheet →IRF5305STRRPBF
✅ Drop-In✓ In Stock
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View Datasheet →IRFR5305TRLPBF
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View Datasheet →IRFR5305TRPBF
✅ Drop-In✓ In Stock
$0.32 / Unit
View Datasheet →IRF4905PBF
✅ Drop-In✓ In Stock
$0.95 / Unit
View Datasheet →FQP47P06
✅ Drop-In📋 Reference alternative (not in catalog)
FQP50P06
✅ Drop-In📋 Reference alternative (not in catalog)
IRF5305PBF Maximum Ratings & Electrical Characteristics
| FET Type | P-Channel |
| Drain-to-Source Voltage (VDS) | -55 V |
| Continuous Drain Current (ID) at TC=25C | -31 A |
| Maximum Power Dissition (PD) at TC=25C | 110 W |
| Gate-to-Source Voltage (VGS) max | ±20 V |
| Static Drain-to-Source On-Resistance (RDS(on)) at VGS=-10V | 60 mOhm (typical) |
| Total Gate Charge (Qg) | 42 nC (typical) |
| Operating Junction Temperature | -55C to +175C |
| Package | TO-220AB (through-hole, 3-pin + tab) |
| Mounting Type | Through Hole |
| Lead-Free Plating (PBF suffix) | Yes (Pb-free) |
| RoHS Status | Compliant |
| Technology | HEXFET (planar DMOS) |
IRF5305PBF Pin Configuration
| Pin 1 | Gate — MOSFET gate; controls channel conduction |
| Pin 2 | Drain — MOSFET drain; load connection (P-Channel: drains current from source) |
| Pin 3 | Source — MOSFET source; tied to higher-potential supply rail (P-Channel) |
| Pin TAB | Drain — Metal tab electrically connected to pin 2 (drain); provides thermal mounting surface |
Safe Operating Area (DC, TJ=25C)
Typical Applications
IRF5305PBF is suitable for 6 applications: High-Side Load Switch in 12V/24V Automotive, H-Bridge DC Motor Direction Control, Power OR-ing for Redundant Supplies, PWM Speed Control for DC Fans, Battery Reverse-Polarity Protection, Buck/Boost Converter High-Side Switch.
High-Side Load Switch in 12V/24V Automotive
The IRF5305PBF is well suited as a high-side load switch in 12V and 24V automotive systems where the P-Channel topology eliminates the need for a charge pump or bootstrap high-side driver. With -55V VDS it provides more than 2x margin over a 24V industrial bus and handles -31A continuous current at TC=25C, sufficient for driving lamps, solenoids, and motor loads. Typical implementation places the IRF5305PBF between the 12V/24V supply and the load, with the source tied to the supply rail, the drain to the load, and the gate pulled to ground (logic-low turns on) via a small gate resistor of 10-100 Ohm. The 60 mOhm RDS(on) at -10V VGS keeps conduction losses manageable, and the 42 nC gate charge allows PWM dimming up to several kHz directly from a microcontroller GPIO through a discrete BJT or MOSFET gate driver.
Recommended
H-Bridge DC Motor Direction Control
The IRF5305PBF is commonly deployed as the high-side switch in H-bridge motor direction-control circuits, paired with N-Channel MOSFETs (such as the IRF540N) on the low side. The P-Channel high-side design lets the gate be driven from the same ground-referenced 0-10V PWM signal used for the low-side N-Channel, simplifying the gate-driver stage. With -31A continuous rating and 110W power dissipation, the IRF5305PBF can drive medium-power DC motors up to several hundred watts at 12V or 24V. The HEXFET avalanche-rated design absorbs the back-EMF energy during motor commutation when paired with proper freewheeling diodes, and the ruggedness of the TO-220AB package provides the thermal headroom needed for repetitive motor-startup surges where peak current may exceed three times the steady-state value.
Recommended
Power OR-ing for Redundant Supplies
The IRF5305PBF is a strong choice for power OR-ing in redundant power-supply systems where two or more input rails must feed a common load with reverse-current blocking. Connected source-to-supply, drain-to-load, with the gate pulled to ground, the device turns on only when its source is at the highest potential; if a competing supply rises higher the device self-biases off because its VGS rises above the threshold. The 60 mOhm RDS(on) keeps forward voltage drop low - around 0.6V at 10A - and the -55V rating gives wide margin for 24V and 48V telecom/datacom OR-ing architectures. For high-current (>30A) redundant systems, two IRF5305PBF devices in parallel share the load thanks to positive RDS(on) temperature coefficient that aids current sharing.
Recommended
PWM Speed Control for DC Fans
The IRF5305PBF works effectively as a high-side PWM switch for brushed-DC fan speed control in industrial enclosures, 3D printers, and server cooling systems. P-Channel high-side switching keeps the fan's negative terminal at system ground, eliminating ground loops and radiated EMI that complicate low-side switching. The 42 nC gate charge allows PWM frequencies up to 25 kHz, well above the audible range, for silent fan operation; the device is fully enhanced at VGS=-10V, easily produced by a microcontroller GPIO through a small BJT level-shifter or a dedicated gate-driver IC. At a typical fan current of 1-3A the conduction loss in the 60 mOhm RDS(on) is negligible (<0.2W), and the TO-220AB tab can be left unheatsinked or attached to a small clip-on heatsink.
Recommended
Battery Reverse-Polarity Protection
The IRF5305PBF can implement a low-loss reverse-polarity protection circuit for 12V lead-acid or lithium battery systems, replacing a Schottky diode and saving up to 1W of dissipation at 10A load. Wired source-to-battery, drain-to-load, with the gate tied to ground through a resistor and protected by a Zener to VGS(max)=20V, the MOSFET conducts in the forward direction and self-biases off if the battery is reversed. The 60 mOhm RDS(on) at -10V VGS gives a forward drop of only -0.6V at 10A, dramatically reducing wasted heat compared to a diode. The -55V VDS also withstands load-dump transients common in 12V automotive systems (which can briefly reach 40V), making the IRF5305PBF a robust choice for battery-protection designs.
Recommended
Buck/Boost Converter High-Side Switch
The IRF5305PBF functions as the high-side switch in non-isolated buck and boost converters, particularly in 12V-input automotive or industrial systems. The P-Channel high-side topology eliminates the bootstrap capacitor and high-side gate-drive circuitry required by an N-Channel high-side switch, simplifying the design. With -55V VDS, -31A peak current handling, and 42 nC total gate charge, the IRF5305PBF supports switching frequencies up to 100 kHz in moderate-power converters (50-200W). The HEXFET avalanche rating (EAS) absorbs the energy stored in the inductor and output capacitance during switch turn-off, contributing to converter reliability. Designers should heatsink the TO-220AB tab to keep junction temperature below 125C for long-term reliability under continuous switching loads.
Recommended
Recommended Products Summary
Engineering reference data for IRF5305PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IRF5305STRLPBF | IRFR5305TRLPBF | IRF4905PBF | FQP47P06 | FQP50P06 |
|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | onsemi | onsemi |
| Package | TO-220AB through-hole | D2PAK (TO-263) SMD | DPAK (TO-252) SMD | TO-220AB through-hole (same) | TO-220AB through-hole (same) | TO-220AB through-hole (same) |
| Drain-to-Source Voltage (VDS) | -55 V | -55 V (same) | -55 V (same) | -55 V (same) | -60 V (+9%) | -60 V (+9%) |
| Continuous Drain Current (ID) | -31 A | -31 A (same) | -31 A (same) | -74 A (+139%) | -47 A (+52%) | -50 A (+61%) |
| On-Resistance RDS(on) at VGS=-10V | 60 mOhm (typical) | 60 mOhm (same) | 60 mOhm (same) | 20 mOhm (-67%) | 26 mOhm (-57%) | 22 mOhm (-63%) |
| Total Gate Charge (Qg) | 42 nC | 42 nC (same) | 42 nC (same) | 180 nC (+329%) | 110 nC (+162%) | 120 nC (+186%) |
| Maximum Power Dissipation | 110 W | 3.8 W (SMD package, much lower) | 2.5 W (SMD package, much lower) | 200 W (+82%) | 120 W (+9%) | 120 W (+9%) |
| RoHS Compliant | Yes (PBF suffix) | Yes | Yes | Yes | Yes | Yes |
| Unit Price (qty 100, USD, as of 2026-09-13) | $0.78 | $1.05 | $0.85 | $1.65 | $0.95 | $1.10 |
Key Differentiators
- Industry-standard TO-220AB P-Channel HEXFET with widest cross-brand drop-in support (vs onsemi FQP47P06)
- Through-hole TO-220AB package allows higher continuous power dissipation than SMD equivalents (vs IRF5305STRLPBF (D2PAK))
- Lower gate charge (42 nC) simplifies gate-driver design versus higher-current alternatives (vs IRF4905PBF)
Design Notes
Estimated: at continuous -10A load with VGS=-10V, conduction loss is roughly I^2 * RDS(on) = 100 * 0.060 = 6W. The TO-220AB package has typical RthJC of ~1.0 C/W, so junction temperature rise above the case is ~6C, but junction-to-ambient RthJA without a heatsink is ~62 C/W, giving a ~372C rise above 25C ambient - far exceeding the 175C limit. A heatsink with RthSA < 5 C/W is required; alternatively a clip-on heatsink with thermal compound on the tab will suffice. Estimate inputs: I=-10A, RDS(on)=60 mOhm, TA=25C, RthJA=62 C/W (no heatsink).
When using the through-hole TO-220AB package, ensure the mounting hole has at least 3mm clearance around the tab for proper heatsink mounting and electrical isolation. Use a mica or silicone insulator pad between the tab and the heatsink if the heatsink is grounded, or mount the heatsink floating with thermal epoxy. For SMD variants (D2PAK/DPAK), ensure the drain-pad copper area on the PCB is at least 1 square inch (645 mm^2) to spread heat; without adequate copper the SMD package cannot dissipate the same power as the through-hole version.
Do not exceed the maximum VGS of ±20V - even brief transients above this can puncture the gate oxide. Add a 10-20V Zener diode from gate to source (with cathode at gate) for protection against inductive transients on the gate-driver line. Also note that the IRF5305PBF is NOT logic-level: driving the gate with -5V (logic low of a 5V system) leaves the device in linear region with very high RDS(on); ensure the gate driver pulls to at least -10V for full enhancement. Finally, the body diode of the IRF5305PBF is relatively slow - for high-frequency switching applications add an external Schottky or fast-recovery diode in parallel with the body diode.
Minimize the gate-loop and drain-loop inductance by keeping the gate-driver trace short and direct, and using a ground plane under the source pin. Use a 10-100 Ohm gate resistor to damp ringing on the gate waveform; this resistor also limits peak gate current from the driver. For high-current applications keep the source and drain copper pours wide (at least 50 mils per ampere) and use 2 oz copper if possible. Place any input/output decoupling capacitors as close to the source/drain pins as the package geometry allows.
Compliance Information
PBF suffix confirms lead-free (Pb-free) plating compliant with EU RoHS Directive. REACH compliance per Infineon product declaration. Halogen-free status not stated in available data. Not AEC-Q100 qualified (industrial/consumer grade). Conflict-minerals compliance per Infineon policy.
