Infineon Technologies BSO4420

Overview

BSO4420 from Infineon Technologies is an N-channel logic-level power MOSFET in SO-8 package, rated for 30 V V_DS, 13 A continuous drain current, and 7.8 mΩ R_DS(on) at V_GS = 10 V. It features avalanche rating, 6 kV/µs dv/dt capability, and optimized gate charge × R_DS(on) figure-of-merit for high-efficiency DC-DC converters and motor drive half-bridges.

For engineers reviewing the BSO4420 datasheet, BSO4420 pinout, BSO4420 application, or BSO4420 equivalent, key selection criteria include its logic-level gate drive compatibility (V_GS(th) = 1.2–2.0 V), low R_DS(on) at 4.5 V (9.3–10.9 mΩ), integrated body diode with 32–48 ns t_rr, and SO-8 thermal performance (R_thJA = 50 K/W with 6 cm² copper).

Technical Context

This MOSFET employs trench-based OptiMOS technology to achieve low conduction loss and fast switching. Its gate threshold voltage (1.2–2.0 V) ensures reliable turn-on with 3.3 V or 5 V logic controllers, while the 1.3 Ω gate resistance and 27–33.7 nC total gate charge support controlled edge rates in hard-switched topologies.

The device is fully characterized for repetitive avalanche energy (E_AS = 230 mJ at T_j = 25 °C) and reverse diode recovery (Q_rr = 43.6–70 nC), enabling robust operation in inductive load switching and synchronous rectification where commutation stress is present.

Key Specifications

Pinout & Package

BSO4420 is housed in a standard SO-8 surface-mount package with exposed drain pad for enhanced thermal dissipation. The package complies with JEDEC MS-012AC and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel logic-level MOSFET applications.

Compared with STL220N3LLH6 and IRF7470PBF, BSO4420 delivers superior thermal management via its exposed drain pad, guaranteed avalanche ruggedness, and tighter V_GS(th) distribution-making it the preferred choice for industrial motor control and unregulated DC-DC designs where reliability under transient stress is mandatory.

Availability

BSO4420 is available at Aetrix Electronics and suitable for brushless DC motor control, industrial DC-DC converters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for BSO4420 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 AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and R&D centers.

The OptiMOS™ product line targets high-efficiency power conversion in space-constrained applications, emphasizing low R_DS(on), fast switching, and ruggedness for motor drives, server PSUs, and EV charging infrastructure.

FAQ

What is the maximum continuous drain current for BSO4420 at 100°C ambient temperature?

At T_A = 100 °C with 6 cm² copper cooling area, the maximum continuous drain current is 6.5 A, as derived from the derating curve on Page 4 of the datasheet. This reflects thermal limitation-not electrical-due to R_thJA = 50 K/W and P_tot = 2.5 W at T_A = 25 °C.

Does BSO4420 require a gate resistor for reliable operation?

Yes. Although the internal gate resistance is 1.3 Ω, an external series gate resistor (typically 5–22 Ω) is required to control dv/dt, suppress ringing, and limit peak gate current during fast switching. The datasheet recommends R_G = 2.2 Ω for dynamic characterization (Page 3).

Can BSO4420 be used in parallel configurations?

Yes, but with strict layout symmetry: matched gate trace lengths, Kelvin source connections, and individual gate resistors. Its positive temperature coefficient of R_DS(on) (Page 6, Figure 9) enables inherent current sharing above ~60 °C, unlike older MOSFETs with negative coefficients.

Is the body diode suitable for synchronous rectification in a 500 kHz buck converter?

Yes. With t_rr = 32–48 ns and Q_rr = 43.6–70 nC, the body diode meets timing and loss requirements for synchronous rectification at 500 kHz, provided gate drive timing accounts for reverse recovery delay and the controller supports adaptive dead-time control.