NXP Semiconductors BUK9520-55A,127

Overview

BUK9520-55A from Nexperia is an AEC-Q101-qualified N-channel TrenchMOS logic-level power MOSFET in TO-220AB (SOT78) package, rated for 55 V V_DS, 54 A I_D at T_mb = 25 °C, and 118 W P_tot, designed for automotive 12 V/24 V load switching in thermally demanding environments up to 175 °C junction temperature.

For engineers reviewing the BUK9520-55A datasheet, BUK9520-55A pinout, BUK9520-55A application, or BUK9520-55A equivalent, this page delivers verified electrical parameters, thermal performance data, gate-drive compatibility with 4.5 V logic sources, avalanche ruggedness (115 mJ), and real-world use context for motor, lamp, and solenoid control in automotive power distribution systems.

Technical Context

This device uses TrenchMOS technology to achieve low R_DS(on) of 17–20 mΩ at V_GS = 5 V and T_j = 25 °C, enabling efficient conduction in high-current DC loads. Its gate threshold voltage (V_GS(th)) ranges from 1.0 V to 2.0 V at 25 °C, ensuring reliable turn-on with standard 3.3 V/5 V microcontroller outputs.

The integrated source-drain diode supports freewheeling in inductive switching applications, with V_SD = 0.85–1.2 V at I_S = 25 A and fast reverse recovery (t_rr = 52 ns, Q_r = 81 nC). Thermal resistance from junction to mounting base is 1.2 K/W, confirming suitability for heatsink-mounted automotive power stages.

Key Specifications

Pinout & Package

TO-220AB (SOT78) plastic single-ended package with heatsink-mounted mounting base electrically connected to the drain terminal. Requires mechanical mounting via screw through central hole; leads are formed for vertical PCB insertion.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP55NF06L and IRFZ44NPBF, BUK9520-55A uniquely combines AEC-Q101 qualification, guaranteed 5 V gate drive, 175 °C operation, and 1.2 K/W thermal resistance - making it the only option among the three validated for under-hood automotive power switching with minimal external components.

Availability

BUK9520-55A is available at Aetrix Electronics and suitable for automotive body control modules, 12 V/24 V DC motor drives, and industrial solenoid actuation requiring stable component supply across extended production lifecycles.

Supply support for BUK9520-55A 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on high-volume, high-reliability components for automotive, industrial, and computing markets.

The BUK9520-55A belongs to Nexperia's TrenchMOS logic-level power MOSFET family, engineered specifically for AEC-Q101-compliant automotive power distribution where low gate drive voltage, thermal resilience, and avalanche ruggedness are essential.

FAQ

What is the maximum continuous drain current for BUK9520-55A at 100 °C mounting base temperature?

The BUK9520-55A supports 38 A continuous drain current at T_mb = 100 °C and V_GS = 5 V, as specified in Table 4 (Limiting values). This derating reflects thermal constraints at elevated ambient conditions and is confirmed by Figure 1, which shows normalized I_D dropping to ~70% of its 25 °C value at 100 °C mounting base temperature. The BUK9520-55A maintains safe operation within its SOA under these conditions.

Is BUK9520-55A suitable for PWM motor control applications?

Yes, BUK9520-55A is well-suited for PWM motor control due to its fast switching characteristics: t_d(on) = 19 ns, t_r = 124 ns, t_d(off) = 92 ns, and t_f = 93 ns at V_GS = 5 V. Its low output capacitance (C_oss = 290–346 pF) and reverse transfer capacitance (C_rss = 194–266 pF) minimize switching losses. The BUK9520-55A also features an integrated source-drain diode with t_rr = 52 ns and Q_r = 81 nC, supporting efficient freewheeling in half-bridge or low-side configurations.

Does BUK9520-55A have a guaranteed R_DS(on) specification at 175 °C junction temperature?

Yes - the BUK9520-55A specifies R_DS(on) ≤ 40 mΩ at V_GS = 5 V, I_D = 25 A, and T_j = 175 °C (Table 6, Static characteristics). This high-temperature on-resistance value is critical for automotive under-hood applications and confirms stable conduction performance across the full qualified operating range. The BUK9520-55A's R_DS(on) increases predictably with temperature, as shown in Figure 13.

Can BUK9520-55A be used in high-side switch configurations?

No - BUK9520-55A is optimized for low-side switching. Its mounting base is internally connected to the drain (Pin 2), and the package lacks isolated gate drive capability required for high-side operation. Using it as a high-side switch would require floating gate drive circuitry and introduce thermal and isolation complications. For high-side applications, dedicated high-side switches or N-channel drivers with charge pumps should be selected instead of the BUK9520-55A.

What is the gate-source voltage rating for BUK9520-55A, and does it support ±10 V drive?

The BUK9520-55A has a continuous V_GS rating of −10 V to +10 V and a pulsed peak rating of −15 V to +15 V (Table 4). It fully supports ±10 V gate drive, enabling robust noise immunity and overdrive capability. However, typical operation uses 0 V to +5 V for logic-level compatibility; negative gate bias improves dv/dt immunity during switching but is not required for basic functionality. The BUK9520-55A's gate oxide is rated for these limits without degradation.