IRLB8748PBF - 30V 92A N-Channel StrongIRFET MOSFET | Infineon
MPN: IRLB8748PBF ✓ פעילIRLB8748PBF סקירה
A power MOSFET is a voltage-controlled semiconductor switch that enables efficient high-frequency switching of electrical loads, serving as the core building block of DC-DC converters, motor drives, and load management systems. MOSFETs sit within the broader hierarchy of discrete semiconductors -> transistors -> power transistors -> power MOSFETs, and are preferred over bipolar transistors when switching speed, drive simplicity, and conduction efficiency matter.
Key features include a total gate charge of 15 nC typical, avalanche-rated ruggedness, and a maximum junction-to-ambient thermal resistance in the TO-220AB package. The StrongIRFET family trades slightly higher RDS(on) for substantially improved avalanche ruggedness and body-diode robustness, making this part ideal for applications with inductive loads and occasional transient stress.
Architecturally, the IRLB8748PBF uses a planar N-channel HEXFET cell structure optimized for very low on-state loss at high currents. The combination of logic-level VGS(th) and low Qg enables direct drive from a microcontroller GPIO or low-side gate driver IC, eliminating the need for a dedicated bootstrap or charge-pump supply.
Typical applications include high-current synchronous rectification in telecom and server DC-DC converters, UPS and inverter switching stages, motor drive H-bridges and half-bridges, and battery protection / load management in industrial power systems. The wide safe operating area also suits hot-swap and OR-ing applications.
When designing with this part, ensure the gate-drive voltage reaches at least 4.5V at the gate pin and account for the body diode's reverse-recovery characteristics in bridge topologies. Use a low-impedance gate return path and adequate heatsinking to keep Tj below 150C at full load.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet, providing engineering context beyond the raw spec table for TO-220-AB power-MOSFET selection.
חלופות תחליף ישיר עבור IRLB8748PBF — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם IRLB8748PBF (אותו גורם צורה וטביעת רגל) — שונים ב Package, Technology, On-Resistance RDS(on) max at VGS=10V, Total Gate Charge (Qg), RoHS Status.
IRFB4321PBF
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
IRFB4110PBF
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←IRFZ48NPBF
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←IRF5305PBF
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←IRFR2405TRPBF
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←IRFB3806PBF
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
IRLB8748PBF דירוגים מרביים ומאפיינים חשמליים
| Drain-Source Voltage (VDS) | 30 V |
| Continuous Drain Current (ID) at TC=25C | 92 A |
| On-Resistance RDS(on) max at VGS=10V | 4.8 mOhm |
| Gate-Source Voltage (VGS) max | +/- 20 V |
| Total Gate Charge (Qg) | 15 nC typical |
| Power Dissipation (PD) at TC=25C | 75 W |
| טווח טמפרטורת פעולה | -55C to +175C (junction) |
| Package Type | TO-220AB through-hole |
| סוג הרכבה | Through Hole |
| Technology Family | StrongIRFET / HEXFET |
| Channel Type | N-Channel |
| Logic-Level Gate Drive | Yes (optimized for 5V VGS) |
| סטטוס RoHS | Compliant (Pb-free PBF suffix) |
| Qualification Standard | JEDEC (Industrial market per datasheet) |
תצורת פינים של IRLB8748PBF
| פין 1 | Gate — Gate control input; logic-level compatible (5V) |
| פין 2 | Drain — Drain terminal (also connected to metal tab) |
| פין 3 | Source — Source terminal and signal return for gate drive |
אזור פעולה בטוח (estimated from datasheet family)
יישומים טיפוסיים
IRLB8748PBF מתאים עבור 6 יישוםs: High-Current Synchronous Rectification, UPS and Inverter Switching Stages, Motor Drive H-Bridge and Half-Bridge, Battery Protection and Hot-Swap Control, Industrial Load Switching, DC-DC Converter High-Side Switch.
High-Current Synchronous Rectification
The IRLB8748PBF is well-suited for synchronous rectification in 12V and 24V DC-DC converter stages where its 4.8 mOhm RDS(on) at VGS=10V minimizes conduction loss and improves overall efficiency versus Schottky diode solutions. With 92A continuous drain current, it can handle multi-kilowatt server and telecom rectifier outputs when paralleled. Logic-level 5V gate drive enables direct PWM control from a digital controller, eliminating the gate-drive losses that plague higher-threshold parts. The StrongIRFET body diode is rugged enough for the dead-time commutation stress typical in buck and forward converter topologies.
מומלץ
UPS and Inverter Switching Stages
The IRLB8748PBF was explicitly optimized for UPS and inverter applications per its datasheet description. Its 30V VDS comfortably covers 24V battery bus rails, and the 92A continuous current rating supports multi-kVA inverter designs. The StrongIRFET cell structure delivers high avalanche energy capability, essential for handling the inductive kick-back from transformer leakage inductance during switching transitions. The 75W power dissipation at TC=25C allows the part to ride through brief overload conditions without immediate thermal shutdown, which is critical in inverter fault-clearance events.
מומלץ
Motor Drive H-Bridge and Half-Bridge
In brushed-DC and BLDC motor drive H-bridges operating from 12V-24V, the IRLB8748PBF provides the high-side or low-side switch element with its 92A current rating and low 4.8 mOhm on-resistance. The logic-level gate threshold enables direct PWM drive from MCUs at 5V or 3.3V without bootstrap supply complications. The rugged body diode simplifies dead-time handling during PWM commutation. Designers should pair this part with complementary P-channel or higher-voltage N-channel MOSFETs on the opposing leg of the H-bridge.
מומלץ
Battery Protection and Hot-Swap Control
The IRLB8748PBF is ideal for high-current battery protection FETs and hot-swap OR-ing applications in industrial battery packs. Its 30V VDS is sufficient for multi-cell Li-ion packs up to 7S nominal, and the 4.8 mOhm RDS(on) minimizes voltage drop during high-current discharge. The high avalanche rating protects against the inrush transients typical of capacitive loads on hot-plug events. In OR-ing configurations, paralleled parts provide both redundancy and lower effective on-resistance.
מומלץ
Industrial Load Switching
For industrial solenoid, relay-replacement, and high-current load switching applications, the IRLB8748PBF offers a robust solution. Its 92A continuous rating handles large inrush currents from capacitors and motors, and the logic-level gate drive simplifies interface to PLC outputs and 5V microcontrollers. The TO-220AB package provides mechanical ruggedness and easy heatsink mounting, while the Infineon Industrial market qualification ensures long-term reliability in factory automation environments.
מומלץ
DC-DC Converter High-Side Switch
In non-isolated buck and buck-boost converter high-side positions, the IRLB8748PBF handles 24V input rails with its 30V VDS rating leaving only modest transient margin. The 15 nC typical total gate charge balances switching loss and drive simplicity, and the logic-level gate threshold allows direct 5V PWM drive. The combination of low RDS(on) and low Qg results in excellent figure-of-merit (FOM) for 100 kHz to 1 MHz switching frequencies typical of modern point-of-load converters.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור IRLB8748PBF — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | IRFB4321PBF | IRFB4110PBF | IRFZ48NPBF | IRF5305PBF | IRFR2405TRPBF | IRFB3806PBF |
|---|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | TO-220AB - same | TO-220AB - same | TO-220AB - same | TO-220AB - same | TO-220AB - same | TO-220AB - same | TO-220AB - same |
| Drain-Source Voltage (VDS) | 30 V | 100 V | 100 V | 55 V | -55 V (P-channel) | 55 V | 60 V |
| Continuous Drain Current (ID) | 92 A | 95 A | 120 A | 64 A | -31 A (P-channel) | 56 A | 100 A |
| On-Resistance RDS(on) max | 4.8 mOhm | 3.4 mOhm (lower) | 3.7 mOhm (lower) | 14 mOhm (higher) | 60 mOhm (higher, P-channel) | 16 mOhm (higher) | 5.9 mOhm (slightly higher) |
| Logic-Level Gate Drive | Yes (5V optimized) | Yes (5V optimized) | Yes (5V optimized) | No (standard 10V gate) | Yes (5V optimized) | No (standard 10V gate) | Yes (5V optimized) |
| Channel Type | N-Channel | N-Channel | N-Channel | N-Channel | P-Channel | N-Channel | N-Channel |
| Technology Family | StrongIRFET / HEXFET | StrongIRFET / HEXFET | StrongIRFET / HEXFET | HEXFET | HEXFET | HEXFET | StrongIRFET / HEXFET |
| Power Dissipation (PD) at TC=25C | 75 W | 125 W | 125 W | 94 W | 75 W | 94 W | 125 W |
מבדילים עיקריים
- Lowest RDS(on) for 30V TO-220AB N-channel StrongIRFET in this datasheet family (לעומתIRFZ48NPBF)
- Logic-level 5V gate drive enabled (לעומתIRFR2405TRPBF)
- 92A continuous drain current at TC=25C (לעומתIRFB4321PBF)
הערות תכנון
Estimated: at VDS=24V, ID=30A continuous operation with RDS(on)=4.8 mOhm at Tj=100C, the IRLB8748PBF dissipates approximately 4.3W. With the TO-220AB junction-to-case thermal resistance around 0.83 C/W, the junction temperature rise above case is approximately 3.6C. Adequate heatsinking is required to keep Tj below 175C; use thermal grease and a clip-on heatsink rated at no more than 5 C/W case-to-ambient for sustained 30A operation. The datasheet's SOA curve must be consulted for pulsed operation.
Place the IRLB8748PBF as close as possible to the gate driver to minimize gate-loop inductance. Use a 10 Ohm gate resistor to damp ringing and a 100k Ohm pull-down on the gate to ensure the MOSFET stays off when the driver is in high impedance. Keep the high-side and low-side source returns separate until they connect at the controller ground to avoid ground bounce in half-bridge topologies.
Do not exceed the +/- 20V VGS absolute maximum - gate over-voltage can permanently damage the thin gate oxide. In bridge topologies, ensure adequate dead time to prevent shoot-through. The body diode is not optimized for high-frequency hard switching; for synchronous rectification at high frequencies consider a part with a faster body diode or add an external Schottky in parallel.
מידע על תאימות
Pb-free PBF suffix indicates lead-free plating. Industrial market qualification per Infineon datasheet. Not AEC-Q100/101 qualified - for automotive use a Q-suffix variant would be required.
