Infineon Technologies IRF9389PBF

Overview

IRF9389PBF from Infineon Technologies is a dual-channel SO-8 packaged HEXFET® Power MOSFET integrating an N-channel (30 V, 6.8 A, 27 mΩ) and P-channel (-30 V, -4.6 A, 64 mΩ) device in one monolithic package for half-bridge or complementary switching applications. It enables compact DC-DC converters, motor drivers, and load switches where space-constrained dual-polarity control is required.

For engineers reviewing the IRF9389PBF datasheet, IRF9389PBF pinout, IRF9389PBF application, or IRF9389PBF equivalent, key selection criteria include verified R_DS(on) at 4.5 V gate drive, confirmed Q_g values (6.8 nC / 8.1 nC), body diode recovery performance (t_rr = 8.4–13 ns / 11–17 ns), and SO-8 thermal resistance (R_θJA = 62.5 °C/W).

Technical Context

This dual MOSFET implements independent N- and P-channel channels with separate gate, drain, and source terminals-no internal connection between devices. Each channel operates with standard enhancement-mode logic: N-ch requires V_GS ≥ +2.3 V to turn on; P-ch requires V_GS ≤ –2.3 V. Gate threshold voltages are temperature-stable (±0.03 V/°C drift for N-ch, ±0.02 V/°C for P-ch).

Thermal design relies on SO-8's R_θJL = 20 °C/W (junction-to-drain lead) and R_θJA = 62.5 °C/W (junction-to-ambient on 1-in² Cu board). Safe operating area (SOA) is defined up to 100 μs pulse width at T_J = 150 °C, limited by R_DS(on) conduction and transient thermal impedance.

Key Specifications

Pinout & Package

IRF9389PBF uses an industry-standard SO-8 surface-mount package (JEDEC MS-012AC) with exposed drain pad for thermal enhancement. Pin numbering follows top-view orientation as shown in datasheet Figure 1: pins 1–4 assigned to N-channel (G1, S1, D1, D1), pins 5–8 to P-channel (D2, D2, S2, G2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel power MOSFET applications.

Compared with IRF9389PBF, Si7851DP offers lower R_DS(on) at cost of higher Q_g, while DMC2038LSD trades marginal R_DS(on) increase for reduced gate charge - enabling cleaner edges and lower driver stress in high-frequency designs.

Availability

IRF9389PBF is available at Aetrix Electronics and suitable for industrial motor control, USB-C power delivery, PLC output modules, and automotive body electronics requiring stable component supply across multi-year production cycles.

Supply support for IRF9389PBF 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, with global manufacturing and quality certification to IATF 16949 and ISO 9001.

The IRF9389PBF belongs to Infineon's HEXFET® Power MOSFET product line, engineered for high-efficiency, space-constrained DC-DC conversion and motor drive applications where dual-polarity switching and thermal robustness are critical.

FAQ

Is IRF9389PBF pin-compatible with IRF7341 or SI4532DY?

No. IRF9389PBF has unique pin mapping: pins 1–4 serve N-channel (G1/S1/D1/D1), pins 5–8 serve P-channel (D2/D2/S2/G2). IRF7341 uses shared-source configuration (S1=S2), and SI4532DY assigns gates to pins 1 and 8 - making them electrically and physically incompatible without PCB redesign.

What is the maximum safe continuous current at 85°C ambient?

At T_A = 85°C, derated continuous current is 4.1 A for N-channel and –2.8 A for P-channel, calculated using R_θJA = 62.5 °C/W, T_J(max) = 150°C, and R_DS(on) temperature coefficient. This assumes 1-in² Cu board with no forced airflow and no heatsink.

Does IRF9389PBF support 3.3 V logic-level gate drive for both channels?

Yes. N-channel turns on fully at V_GS = 4.5 V (V_GS(th) max = 2.3 V), and P-channel turns on fully at V_GS = –4.5 V (V_GS(th) min = –2.3 V). With 3.3 V logic, external level shifters or charge pumps are required for reliable P-channel gate drive in high-side configurations.

Can the body diodes be used for synchronous rectification?

Yes. Both channels feature fast-recovery body diodes (t_rr ≤13 ns N-ch, ≤17 ns P-ch) with low V_SD (≤1.2 V), validated for synchronous rectification in buck converters up to 500 kHz. Diode conduction must be timed to avoid shoot-through using dead-time control.