Nexperia USA Inc. BUK4D122-20PX

Overview

BUK4D122-20PX from Nexperia is a P-channel enhancement-mode Trench MOSFET in a DFN2020MD-6 (SOT1220) package, rated for −20 V drain-source voltage, 100–122 mΩ R_DS(on) at V_GS = −4.5 V and I_D = −3.2 A, and qualified to AEC-Q101 for automotive use. It serves as a high-side load switch in low-voltage power management circuits with thermal robustness up to T_j = 175 °C.

For engineers reviewing the BUK4D122-20PX datasheet, BUK4D122-20PX pinout, BUK4D122-20PX application, or BUK4D122-20PX equivalent, key selection criteria include its ultra-thin 2 × 2 × 0.65 mm leadless package with side-wettable flanks, −1.25 V gate threshold, 3.3–5 nC total gate charge, and 2 kV HBM ESD rating - all critical for space-constrained, thermally demanding automotive and industrial switching designs.

Technical Context

This device uses Trench MOSFET technology to achieve low on-resistance and fast switching in a thermally enhanced DFN package. Its six-terminal layout integrates five drain connections and one source connection per side, enabling high-current capability and efficient heat dissipation through the exposed drain pad.

The gate threshold voltage range of −0.75 V to −1.25 V ensures reliable turn-on with standard logic-level drive (e.g., −4.5 V), while the 39 pF reverse transfer capacitance (C_rss) and 36 ns turn-off delay support stable operation in high-speed line driver and relay driver topologies without oscillation risk.

Key Specifications

Pinout & Package

DFN2020MD-6 (SOT1220) is a 2 mm × 2 mm × 0.65 mm leadless, thermally enhanced plastic package with side-wettable flanks for optical solder inspection and improved thermal performance via the exposed drain pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel MOSFET switching applications.

Compared with DMG2305UVT-7, BUK4D122-20PX trades 56 mΩ higher R_DS(on) for AEC-Q101 qualification and superior thermal resistance via its exposed drain pad; compared with PSMN2R0-30YLC, it offers 60% smaller footprint and 85% lower gate charge at the cost of 10 V lower voltage rating and 2.2× higher on-resistance - making it optimal for compact 12 V automotive switches.

Availability

BUK4D122-20PX is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC output stages, and USB-C power delivery switching requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for BUK4D122-20PX 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.

BUK4D122-20PX belongs to Nexperia's TrenchMOS automotive portfolio, engineered specifically for high-efficiency, space-constrained power switching in 12 V vehicle networks - emphasizing thermal resilience, manufacturability, and AEC-Q101 compliance.

FAQ

What is the maximum continuous drain current for BUK4D122-20PX at 100 °C ambient temperature?

The maximum continuous drain current is −2 A at T_amb = 100 °C, as specified in Table 5 (Limiting Values). This reflects thermal derating due to reduced heat dissipation capability at elevated ambient temperatures, assuming standard FR4 PCB mounting with single-sided copper and 6 cm² drain pad area.

Does BUK4D122-20PX have an integrated body diode, and what are its key parameters?

Yes, it features an integrated source-drain body diode with V_SD = −0.9 to −1.2 V at I_S = −1.9 A and T_j = 25 °C, and t_rr = 13.7 ns with Q_r = 4.5 nC under specified test conditions. These values support efficient freewheeling in inductive load switching without external diode addition.

Can BUK4D122-20PX be used with 3.3 V logic-level gate drive?

Yes - its gate threshold voltage range of −0.75 V to −1.25 V ensures reliable turn-on with 3.3 V logic (i.e., V_GS = −3.3 V), delivering R_DS(on) ≤ 190 mΩ at I_D = −2.6 A and T_j = 25 °C, as confirmed in Table 7 (Characteristics).

What is the significance of side-wettable flanks in the DFN2020MD-6 package?

Side-wettable flanks are tin-plated vertical edges on the package that allow automated optical inspection (AOI) of solder fillets during reflow, verifying joint quality without X-ray. This feature improves process yield and field reliability in high-volume automotive and industrial PCB assembly lines.