Nexperia USA Inc. PBSS4350Z/ZLF

Overview

PBSS4350Z from Nexperia is a 50 V, low V_CE(sat) NPN bipolar junction transistor in SOT223 (SC-73) package, rated for 3 A continuous collector current and 5 A peak pulse current. It delivers 110–145 mΩ R_CE(sat) at I_C = 2 A / I_B = 200 mA and h_FE ≥ 200 at I_C = 500 mA, enabling high-efficiency switching in DC/DC converters and battery charger circuits.

For engineers reviewing the PBSS4350Z datasheet, PBSS4350Z pinout, PBSS4350Z application, or PBSS4350Z equivalent, key selection criteria include verified R_CE(sat), thermal resistance under defined PCB mounting conditions (62.5 K/W on 6 cm² copper), and validated performance across −55 °C to 150 °C junction temperature range.

Technical Context

This NPN transistor operates as a medium-power, low-saturation-voltage switch optimized for linear regulation and inductive load driving. Its architecture supports high-current gain stability up to I_C = 2 A and maintains V_CE(sat) ≤ 290 mV with I_B/I_C = 0.1.

Thermal design relies on the SOT223 package's integrated heatsink pad, delivering 62.5 K/W R_th(j-a) when mounted on 6 cm² FR4 copper - critical for sustained 3 A operation without forced cooling.

Key Specifications

Pinout & Package

The PBSS4350Z uses an SC-73 (SOT223) surface-mount plastic package with four leads, including dual collector terminals for enhanced thermal and current handling. The body measures 6.5 mm × 3.5 mm × 1.65 mm, with a 2.3 mm lead pitch and integrated heatsink pad on lead 2 and 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSS40501MUTBG and DXT695BKQ-13, PBSS4350Z uniquely combines 50 V rating, 3 A continuous current, sub-145 mΩ R_CE(sat), and dual-collector thermal design - enabling smaller heatsinks and higher power density in space-constrained 24–48 V industrial power stages.

Availability

PBSS4350Z is available at Aetrix Electronics and suitable for DC/DC converters, battery chargers, and supply line switching requiring stable component supply across industrial production lifecycles.

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 focused on high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands.

PBSS4350Z belongs to Nexperia's "Low V_CE(sat) Transistor" product line, engineered specifically for efficiency-critical power switching in industrial, computing, and consumer power management systems.

FAQ

What is the maximum allowable base current for PBSS4350Z?

The absolute maximum peak base current is 1 A per pulse (t_p ≤ 1 ms), as specified in Table 5. For continuous operation, base current must be limited to ensure junction temperature remains ≤150 °C - typical design practice uses I_B = 200 mA to achieve full saturation at I_C = 2 A, yielding safe thermal margin on standard FR4 PCBs.

Can PBSS4350Z replace a MOSFET in a 24 V switching application?

Yes - PBSS4350Z can replace small-signal MOSFETs in low-frequency (<100 kHz), high-current linear or saturated switching roles where gate drive complexity or cost is prohibitive. Its 110–145 mΩ R_CE(sat) provides comparable conduction loss to many 20 V logic-level MOSFETs, though it lacks inherent reverse recovery immunity and requires base current control instead of voltage control.

Is PBSS4350Z qualified for automotive applications?

No - per Revision History (Table 8), PBSS4350Z v.4 explicitly states "Product(s) changed to non-automotive qualification." It is not AEC-Q101 qualified, has no automotive-grade screening, and is not warranted for use in safety-critical or life-support systems. Automotive alternatives must be selected from Nexperia's dedicated -Q qualified portfolio.

How does the dual-collector configuration affect PCB layout?

Pins 2 and 4 are internally shorted to the collector and share the same thermal pad. Layout must connect both pins to a single, continuous copper pour ≥6 cm² for optimal R_th(j-a) = 62.5 K/W. Splitting the pads or routing them separately degrades thermal performance and risks current imbalance, potentially exceeding R_CE(sat) limits under full load.