NXP Semiconductors PHN203,518

Overview

PHN203 from Nexperia is a dual N-channel TrenchMOS logic-level power MOSFET in an SO8 (SOT96-1) package, designed for high-efficiency DC-to-DC conversion and lithium-ion battery protection circuits. It features 30 V V_DS, 6.3 A continuous drain current at 25 °C, 24 mΩ typical R_DS(on) at V_GS = 10 V and 25 °C, fast switching with 5 ns turn-on delay and 3 nC Q_GD, and logic-level gate drive compatibility down to 4.5 V.

For engineers reviewing the PHN203 datasheet, PHN203 pinout, PHN203 application, or PHN203 equivalent, this device is selected for compact dual-FET topologies requiring low conduction loss, fast transient response, and direct microcontroller-compatible gate control in portable power systems.

Technical Context

The PHN203 integrates two independent N-channel enhancement-mode MOSFETs using TrenchMOS technology, enabling synchronous rectification and bidirectional load switching in half-bridge or dual-switch configurations. Its gate threshold voltage ranges from 0.6 V (at 150 °C) to 2.2 V (at −55 °C), ensuring reliable turn-on across industrial temperature extremes.

Static and dynamic parameters are characterized under pulsed conditions per IEC 60134 limiting values, with R_DS(on) specified at both 10 V and 4.5 V gate drive, and avalanche ruggedness rated at 37.8 mJ (unclamped, 0.2 ms pulse). Thermal resistance from junction to ambient is 62.5 K/W on minimum PCB footprint.

Key Specifications

Pinout & Package

PHN203 uses the SOT96-1 (SO8) plastic small outline package, 8-lead, 3.9 mm body width, with exposed drain pads for thermal performance. Pin 1 is source1, pin 2 is gate1, pin 3 is source2, pin 4 is gate2, pins 5–6 are drain2, pins 7–8 are drain1 - enabling dual high-side or low-side switch configuration with shared drain terminals per channel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMN2033LSD-13 and SI3457DV-T1-GE3, the PHN203 offers superior thermal robustness (62.5 K/W), verified avalanche capability (37.8 mJ), and true dual-channel electrical isolation - making it preferred for industrial battery protection and high-reliability DC-DC converters.

Availability

PHN203 is available at Aetrix Electronics and suitable for DC-to-DC converters, lithium-ion battery protection circuits, and industrial load switching applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for PHN203 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 delivering high-performance, reliable discrete, logic, and MOSFET solutions, with leadership in automotive and industrial power management.

The PHN203 belongs to Nexperia's TrenchMOS logic-level FET product line, engineered specifically for high-efficiency, space-constrained power conversion and battery management systems demanding low gate drive voltage and robust avalanche performance.

FAQ

What is the maximum continuous drain current for PHN203 at 70 °C ambient?

The PHN203 supports 5 A continuous drain current at T_amb = 70 °C, as specified in Table 4 (Limiting Values). This derating reflects thermal constraints on the SO8 package with standard PCB mounting, and aligns with the normalized current curve in Figure 1, where current drops to ~80 % of the 25 °C value.

Can PHN203 be used in a high-side switch configuration?

Yes - each channel operates as an independent N-channel MOSFET, so high-side switching is possible with appropriate gate drive (e.g., bootstrap or charge-pump circuitry). However, the device itself does not integrate level-shifting; external gate control must provide V_GS ≥ 4.5 V relative to the source node, which floats in high-side operation.

Does PHN203 have integrated ESD protection on its gate terminals?

No - the datasheet does not specify built-in gate ESD protection structures. Nexperia recommends external gate resistors (≤100 Ω) and TVS diodes between gate and source for robustness in automated assembly or field environments with static discharge risk, especially given the 20 V absolute maximum V_GS.

How is thermal performance affected when both channels operate simultaneously?

Simultaneous conduction increases total power dissipation and junction temperature. The 2 W P_tot rating applies to the entire package - if both channels dissipate 1 W each, junction temperature rise will exceed limits unless PCB copper area and airflow are enhanced. Derating curves in Figure 2 confirm that total power must be reduced by ~25 % at 70 °C ambient for dual-channel steady-state operation.