NXP Semiconductors PHD22NQ20T,118

Overview

PHD22NQ20T from NXP Semiconductors (formerly Philips Semiconductors) is an N-channel TrenchMOS™ standard-level power MOSFET designed for high-efficiency DC-to-DC converters and general-purpose switching applications. It delivers V_DS = 200 V, R_DS(on) ≤ 120 mΩ at V_GS = 10 V and I_D = 12 A, with P_tot = 150 W at T_mb = 25 °C, and features avalanche ruggedness of 150 mJ in unclamped inductive loads.

For engineers reviewing the PHD22NQ20T datasheet, PHD22NQ20T pinout, PHD22NQ20T application, or PHD22NQ20T equivalent, this device is selected for medium-voltage, moderate-current switching where low conduction loss, fast turn-on/turn-off (t_d(on) = 10 ns, t_f = 37 ns), and robust thermal performance (R_th(j-mb) = 1.0 K/W) are critical in board-mounted power stages.

Technical Context

The PHD22NQ20T employs TrenchMOS™ technology to achieve low R_DS(on) and high cell density in a D-PAK (SOT428) package. Its gate threshold voltage V_GS(th) ranges from 2–4 V at 25 °C, enabling standard-level logic drive compatibility without requiring dedicated gate drivers. The device supports pulsed peak drain current up to 42.2 A and exhibits controlled dynamic characteristics: Q_g(tot) = 30.8 nC, Q_gd = 11.3 nC, and C_iss = 1380 pF - balancing switching speed and EMI control.

Thermally, it uses the mounting base (MB) as the primary heat path, with R_th(j-mb) = 1.0 K/W and R_th(j-a) = 75 K/W on minimum PCB footprint. Its source-drain diode has V_SD = 0.86–1.2 V at I_S = 20 A and t_rr = 140 ns, supporting synchronous or freewheeling operation in buck and flyback topologies.

Key Specifications

Pinout & Package

PHD22NQ20T is housed in a plastic D-PAK (SOT428) surface-mount package with three leads: Gate (pin 1), Drain (pin 2), Source (pin 3). The mounting base (MB) is electrically connected to the drain and serves as the primary thermal interface. Pin 2 is inaccessible due to internal leadframe cropping per SOT428 mechanical specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP22NF20 and IRF640NPBF, PHD22NQ20T offers superior thermal performance via its D-PAK mounting base, lower R_DS(on), and faster switching - making it optimal for space-constrained, high-efficiency 300–500 kHz DC-DC stages where thermal management is critical.

Availability

PHD22NQ20T is available at Aetrix Electronics and suitable for DC-DC converters, industrial motor drives, and telecom power distribution requiring stable component supply across extended production lifecycles.

Supply support for PHD22NQ20T 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

NXP Semiconductors is a global semiconductor leader delivering high-performance analog, logic, and power solutions for automotive, industrial, and communications markets.

The PHD22NQ20T belongs to NXP's TrenchMOS™ standard-level power MOSFET family, engineered for efficient, robust switching in medium-voltage industrial and telecom power supplies where thermal reliability and gate-drive simplicity are essential.

FAQ

What is the maximum continuous drain current for PHD22NQ20T at 100 °C mounting base temperature?

The PHD22NQ20T supports a continuous drain current of 14.9 A at T_mb = 100 °C and V_GS = 10 V, as specified in Table 3 of the product data sheet. This derating reflects thermal limitations of the D-PAK package and must be verified against actual PCB layout and heatsinking in the final design. PHD22NQ20T maintains safe operation within its SOA curve up to this current under steady-state conditions.

Does PHD22NQ20T have a built-in body diode, and what are its key parameters?

Yes, PHD22NQ20T integrates a source-drain body diode with forward voltage V_SD = 0.86–1.2 V at I_S = 20 A and reverse recovery time t_rr = 140 ns. Its recovered charge Q_r is 680 nC, and peak forward current I_SM reaches 42.2 A in pulsed operation. These values are confirmed in Table 5 and Figure 12 of the PHD22NQ20T datasheet and support freewheeling in buck and flyback converters without external diodes.

Can PHD22NQ20T be driven directly by a 3.3 V microcontroller GPIO?

No - PHD22NQ20T is a standard-level MOSFET with V_GS(th) = 2–4 V, but full enhancement requires V_GS ≥ 10 V to achieve R_DS(on) ≤ 120 mΩ. A 3.3 V GPIO cannot provide sufficient gate overdrive; using it risks high conduction loss and thermal runaway. PHD22NQ20T must be driven by a dedicated gate driver or level-shifter capable of delivering 10–15 V to ensure reliable switching performance.

What is the thermal resistance from junction to mounting base for PHD22NQ20T, and how does it impact heatsink design?

The PHD22NQ20T has R_th(j-mb) = 1.0 K/W, measured from junction to mounting base (Table 4), which is the dominant thermal path. This value means that for every watt dissipated, the junction rises 1 °C above the mounting base temperature. Effective heatsink design must minimize R_{th(mb-heatsink)} and R_{th(heatsink-ambient)} to keep T_j ≤ 175 °C - for example, 50 W dissipation requires total system thermal resistance ≤ 1.5 K/W including interface materials.

Is PHD22NQ20T suitable for avalanche operation, and what is its rated energy?

Yes, PHD22NQ20T is rated for non-repetitive avalanche operation with E_DS(AL)S = 150 mJ under defined test conditions (ID = 9.3 A, tp = 0.13 ms, VDD ≤ 200 V, RGS = 50 Ω, VGS = 10 V, starting at Tj = 25 °C). This rating is validated per JEDEC standards and enables use in inductive switching circuits like motor drives and relay drivers where transient energy absorption is required. PHD22NQ20T should not be operated in repetitive avalanche mode.