Nexperia USA Inc. PBSS5420D-QX

Overview

PBSS5420D-QX from Nexperia is a PNP low V_CE(sat) Breakthrough in Small Signal (BISS) transistor in SOT457 (SC-74) package, designed for high-efficiency power switching with −20 V V_CEO, −4 A continuous collector current, 50–70 mΩ R_CE(sat) at −4 A/−400 mA, and ultra-low −200 to −280 mV V_CE(sat). It serves as a compact, thermally robust switch in DC-DC converters and MOSFET gate drivers.

For engineers reviewing the PBSS5420D-QX datasheet, PBSS5420D-QX pinout, PBSS5420D-QX application, or PBSS5420D-QX equivalent, this page delivers verified electrical specs, validated 6-pin SOT457 terminal mapping, real-world use cases in TFT backlight inverters and motor power switches, and two confirmed alternative parts with documented parameter differences.

Technical Context

This BISS transistor employs a proprietary low-saturation architecture that reduces conduction losses without compromising switching speed-achieving 10 ns delay time and 280 ns turn-off time under −3 A load. Its dual-collector layout (pins 1,2,5,6) enables enhanced thermal dissipation and current sharing in high-current paths.

The device operates with a minimum h_FE of 120 at −4 A/−2 V, supports peak currents up to −15 A, and maintains stable V_BE(sat) between −1.0 V and −1.1 V at rated drive conditions-enabling predictable base drive design in high-side switching configurations.

Key Specifications

Pinout & Package

Package: SOT457 (SC-74), 6-lead surface-mount plastic package with exposed collector pads (pins 1,2,5,6) for enhanced thermal performance and current handling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PBSS5420D-QX, PBSS5320D-QX trades current capacity and efficiency for cost reduction, while DMT3006LPSQ-13 shifts from bipolar to MOSFET topology-introducing gate-drive complexity but eliminating base current requirements and offering better high-frequency stability.

Availability

PBSS5420D-QX is available at Aetrix Electronics and suitable for power management functions, charging circuits, DC-to-DC conversion, and MOSFET gate driving requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for PBSS5420D-QX 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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on high-volume, high-reliability components for automotive, industrial, and computing markets.

PBSS5420D-QX belongs to Nexperia's BISS transistor product line, engineered specifically for high-efficiency, high-current switching in space-constrained power stages-emphasizing low saturation voltage, thermal robustness, and manufacturability in automated SMT lines.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum DC base current is −0.8 A per datasheet Table 5. However, for reliable continuous operation at −4 A collector current, the recommended base drive is −400 mA (IC/IB = 10), ensuring full saturation without excessive base power dissipation or thermal stress on the bond wires.

Can PBSS5420D-QX replace a standard PNP BJT like BC807 in high-current applications?

No-it is not a drop-in replacement. While both are PNP transistors, PBSS5420D-QX has four collector pins, 50 mΩ R_CE(sat), and −4 A rating versus BC807's single collector, 500 mΩ R_CE(sat), and −500 mA rating. PCB layout, drive strength, and thermal pad design must be re-evaluated for PBSS5420D-QX integration.

How does the multi-collector configuration affect PCB layout?

All four collector pins (1,2,5,6) must be connected to the same high-current copper pour-ideally ≥1 cm²-to realize the full thermal and current-handling benefits. Splitting or isolating any collector pin degrades R_CE(sat) and increases local heating, violating the device's design intent and derating curves.

Is PBSS5420D-QX qualified for automotive applications?

Yes-Nexperia specifies this part with AEC-Q101 qualification for discrete semiconductors. Its −65 °C to +150 °C operating range, 150 °C max junction temperature, and robust construction meet requirements for under-dash and engine-compartment-adjacent modules such as body control units and fan drivers.