Nexperia USA Inc. PBSS4350Z,135

Overview

PBSS4350Z from Nexperia is a 50 V, 3 A low V_CE(sat) NPN transistor in SOT223 (SC-73) package, optimized for high-efficiency switching in power management and DC/DC converters. It delivers R_CE(sat) = 110–145 mΩ at I_C = 2 A / I_B = 200 mA, h_FE ≥ 200 at I_C = 500 mA, and operates up to 150 °C junction temperature-enabling compact, thermally robust load switching in battery chargers and LDO drivers.

For engineers reviewing the PBSS4350Z datasheet, PBSS4350Z pinout, PBSS4350Z application, or PBSS4350Z equivalent, key selection criteria include verified low saturation resistance, validated thermal performance on FR4 PCBs with 6 cm² copper pad, confirmed 5 A peak current capability, and documented compatibility with inductive loads such as relays and motors.

Technical Context

This NPN transistor uses epitaxial planar die construction with optimized base doping and emitter geometry to achieve low V_CE(sat) while maintaining high h_FE linearity across I_C = 100 mA to 2 A. Its SC-73 package integrates an extended collector tab for direct thermal conduction to PCB copper, supporting P_tot = 2 W with 6 cm² heatsinking.

The device is characterized under pulsed conditions (t_p ≤ 300 µs, duty δ ≤ 0.02) to ensure stable h_FE and R_CE(sat) at elevated ambient temperatures. Absolute maximum ratings comply with IEC 60134, including V_CEO = 50 V, V_CBO = 60 V, and T_j = 150 °C.

Key Specifications

Pinout & Package

SOT223 (SC-73) plastic surface-mount package with 4 leads, 2.3 mm pitch, and integrated heatsink tab (collector connected to pins 2 and 4). Dimensions: 6.5 mm × 3.5 mm × 1.65 mm body; mounting pad area directly impacts thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low V_CE(sat) NPN switching applications.

Compared with NSS40501MUTBG and DXTN200100000000, PBSS4350Z provides superior h_FE consistency at high current and tighter R_CE(sat) tolerance, making it optimal for precision current regulation and thermally constrained layouts where base drive is limited.

Availability

PBSS4350Z is available at Aetrix Electronics and suitable for power management, DC/DC converters, and inductive load driver applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial and embedded OEM programs.

Supply support for PBSS4350Z 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 specializing in high-performance, high-reliability discrete and logic devices, with leadership in advanced packaging and automotive-grade solutions.

PBSS4350Z belongs to Nexperia's low V_CE(sat) transistor family, engineered specifically for high-efficiency power switching in industrial, consumer, and computing applications where thermal density and conduction loss are critical design constraints.

FAQ

What is the maximum continuous collector current for PBSS4350Z at 70 °C ambient?

At T_amb = 70 °C with a 6 cm² copper pad, PBSS4350Z supports 2.4 A continuous collector current. This is derived from its 2 W total power dissipation rating and 62.5 K/W thermal resistance, yielding a 125 K temperature rise above ambient before reaching the 150 °C junction limit.

Can PBSS4350Z replace a standard general-purpose NPN transistor like BC817 in a 12 V relay driver?

Yes-PBSS4350Z improves relay drive performance by reducing V_CE(sat) from ~300 mV (BC817) to ≤290 mV at 1 A, cutting conduction loss by 30%, and delivering higher h_FE (200 vs. 100) for lower base drive requirements. Its SOT223 package also provides better thermal handling than SOT23.

Is PBSS4350Z qualified for automotive applications?

No-this part is explicitly marked as non-automotive qualified per the 2025 datasheet revision history. For automotive use, Nexperia offers the Q-qualified PBSS4350Z-Q variant, which undergoes AEC-Q101 testing and supports extended temperature and reliability requirements.

What is the recommended PCB layout for optimal thermal performance?

Use a minimum 6 cm² copper pour connected directly to pins 2 and 4 (collectors) with multiple thermal vias to inner/ground planes. Maintain ≥0.5 mm clearance from other components, and follow Nexperia's reflow footprint (Fig. 9) with 1.2 mm solder mask openings on collector pads to maximize thermal conduction.