Nexperia USA Inc. PBSS4240ZF

Overview

PBSS4240ZF from Nexperia is an NPN low V_CEsat (BISS) transistor in SOT223 (SC-73) package, designed for high-efficiency switching in medium-power DC-DC converters and load drivers. It delivers 40 V V_CEO, 2 A continuous I_C, 275 mΩ R_CEsat at 1 A/100 mA drive, and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the PBSS4240ZF datasheet, PBSS4240ZF pinout, PBSS4240ZF application, or PBSS4240ZF equivalent, key selection criteria include low saturation resistance for thermal efficiency, SOT223 thermal performance with extended heatsink pad, and verified operation in 12 V–24 V inductive load switching circuits.

Technical Context

This BISS transistor uses a breakthrough silicon structure to achieve ultra-low V_CEsat while maintaining high current gain (h_FE = 75–80 at 2 A) and robust switching speed (f_T = 150 MHz). Its dual-collector pin configuration (pins 2 and 4) enables enhanced thermal dissipation through a large copper heatsink area on PCB.

The device operates across –55 °C to 150 °C junction temperature, with thermal resistance as low as 93 K/W (R_th(j-a)) when mounted on 6 cm² collector pad - critical for sustained 2 A conduction in space-constrained industrial power stages.

Key Specifications

Pinout & Package

SOT223 (SC-73) plastic surface-mounted package with integrated heatsink pad; 4 leads, standardized footprint per Fig. 12 (reflow) and Fig. 13 (wave soldering); collector terminals (pins 2 and 4) electrically common and thermally optimized for PCB copper area attachment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN low-V_CEsat transistor applications.

Compared with PBSS4240ZF, NSS40501MR6T1G trades off current capability and thermal headroom for second-source availability, while DXTN20020CTR offers lower R_CEsat but sacrifices 50 % voltage margin - making PBSS4240ZF the optimal balance for 12–24 V automotive and industrial switching.

Availability

PBSS4240ZF is available at Aetrix Electronics and suitable for DC-to-DC conversion, supply line switching, and inductive load driver applications requiring stable component supply across automotive production, industrial automation, and medical power subsystems.

Supply support for PBSS4240ZF 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 essential semiconductors - high-volume, high-reliability discrete, logic, and MOSFET devices engineered for automotive, industrial, and computing applications.

PBSS4240ZF belongs to Nexperia's BISS transistor product line, developed specifically to replace conventional BJTs in medium-power switching roles where low conduction loss and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum continuous collector current for PBSS4240ZF at 100 °C ambient?

At T_amb = 100 °C with 6 cm² collector pad, PBSS4240ZF supports 1.6 A continuous I_C based on its 1.35 W P_tot rating and 93 K/W R_th(j-a). Derating follows the curve in Figure 1: power drops linearly from 1.35 W at 25 °C to 0.65 W at 125 °C ambient.

Can PBSS4240ZF be used as a direct replacement for standard SOT223 NPN transistors like BC817?

No - PBSS4240ZF is not a drop-in replacement for BC817 due to its dual-collector pinout (pins 2 and 4), higher gain, and significantly lower V_CEsat. Layout must accommodate both collector pads, and base drive must be increased to 200 mA for 2 A loads to ensure full saturation.

Is the SOT223 footprint compatible with wave soldering processes?

Yes - Nexperia provides dedicated wave soldering footprint data (Figure 13) with 1.9 mm solder lands and defined transport direction. The package's exposed collector pads ensure reliable wetting and mechanical anchoring, meeting IPC-A-610 Class 2 requirements for industrial assemblies.

Does PBSS4240ZF require a gate resistor like MOSFETs do?

No - as a bipolar junction transistor, PBSS4240ZF uses base current control, not gate voltage. A series base resistor is required to limit I_B; for 2 A I_C, 200 mA I_B demands ~16 Ω from a 3.3 V MCU GPIO (accounting for V_BEsat ≈ 1.2 V), not a gate resistor.