Nexperia USA Inc. PBSS5440D,115

Overview

PBSS5440D from Nexperia is a PNP low V_CE(sat) bipolar transistor in TSOP6 (SOT457) package, rated for −40 V V_CEO, −4 A continuous I_C, and 55 mΩ typical R_CE(sat). It serves as a high-efficiency power switch in DC-DC converters, motor drivers, and TFT backlight inverters where minimal conduction loss and thermal stress are critical.

For engineers reviewing the PBSS5440D datasheet, PBSS5440D pinout, PBSS5440D application, or PBSS5440D equivalent, key selection criteria include verified −4 A DC current capability, sub-320 mV V_CE(sat) at −4 A/−400 mA drive, 6-pin TSOP6 footprint compatibility, and thermal resistance down to 113 K/W with 6 cm² FR4 copper pad - all confirmed per Nexperia's September 2025 product data sheet.

Technical Context

This PNP transistor uses epitaxial planar die construction optimized for low saturation voltage and high current gain (h_FE = 30–60 at −6 A). Its switching performance is characterized by 55 ns turn-on time, 320 ns turn-off time, and 110 MHz f_T, enabling efficient operation up to several hundred kHz in hard-switched topologies.

The device features symmetrical collector terminals (pins 1, 2, 5, 6), single base (pin 3), and emitter (pin 4), supporting high-current routing with reduced PCB trace inductance. Thermal design leverages dual mounting options: ceramic Al₂O₃ PCB (350 K/W R_th(j-a)) or FR4 with extended collector pad (113 K/W).

Key Specifications

Pinout & Package

Package: TSOP6 (SOT457), 6-lead surface-mount plastic package with 0.65 mm pitch, 3.1 mm × 2.5 mm body, and exposed collector pads on pins 1, 2, 5, 6 for enhanced thermal transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSS40501MR6T1G and DXT5440P6-13, PBSS5440D delivers superior thermal performance via its four-collector layout and lowest verified R_CE(sat), enabling smaller PCB area, lower driver power, and higher reliability in thermally constrained 4 A power switches.

Availability

PBSS5440D is available at Aetrix Electronics and suitable for DC-DC conversion, MOSFET gate driving, and TFT backlight inverter applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for PBSS5440D 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, with leadership in automotive, industrial, and mobile power management solutions.

PBSS5440D belongs to Nexperia's "Low V_CE(sat) Transistor" product line, engineered specifically for high-current, low-loss switching in space-constrained power management circuits where thermal efficiency and PCB real estate are critical.

FAQ

What is the maximum continuous collector current for PBSS5440D under standard PCB conditions?

The PBSS5440D supports −4 A continuous collector current when mounted on an FR4 PCB with a 6 cm² copper pad for the collector terminals, achieving 113 K/W thermal resistance. Without extended copper, the rating drops to −2.5 A at 25 °C ambient per the derating curve in Figure 1.

Can PBSS5440D replace an NPN transistor in a circuit?

No - PBSS5440D is a PNP transistor with inverted polarity: it conducts when the base is driven negative relative to the emitter. Direct replacement of an NPN requires circuit redesign, including reversed supply connections and inverted control logic. Its NPN complement is PBSS4440D.

Is PBSS5440D qualified for automotive applications?

No - the September 2025 datasheet explicitly states this part is non-automotive qualified. It has not undergone AEC-Q101 stress testing or automotive-grade process controls. For automotive use, Nexperia offers the −Q qualified variant PBSS5440D-Q.

How does the four-collector pin configuration affect PCB layout?

The four collector pins (1, 2, 5, 6) must be routed to a common high-current net - typically a large copper pour - to exploit their parallel current-handling and thermal benefits. Splitting them reduces current capacity and increases localized heating; all four must share identical trace geometry and thermal vias for balanced performance.