NXP Semiconductors PBSS5140S,126

Overview

PBSS5140S from NXP Semiconductors is a 40 V, −1 A PNP low V_CEsat transistor in SOT54 (TO-92) package, featuring ultra-low saturation voltage (−500 mV at −1 A/−100 mA), 830 mW power dissipation, and 150 MHz transition frequency. It serves as a high-efficiency switching device in battery-powered DC/DC converters and LCD back-lighting circuits.

For engineers reviewing the PBSS5140S datasheet, PBSS5140S pinout, PBSS5140S application, or PBSS5140S equivalent, key selection criteria include verified −40 V V_CEO, confirmed R_CEsat < 500 mΩ at −500 mA, thermal resistance of 150 K/W, and SOT54 through-hole pin mapping for manual assembly and legacy board compatibility.

Technical Context

The PBSS5140S employs a planar epitaxial PNP structure optimized for low on-state loss, with V_CEsat specified down to −200 mV at light load (−100 mA/−1 mA) and −500 mV at full rated current (−1 A/−100 mA). Its h_FE ranges from 160 to 800 across −1 mA to −1 A, supporting both linear regulation and hard-switching modes.

Thermal performance is defined for single-sided PCB mounting per IEC 60134, delivering 150 K/W junction-to-ambient resistance. Device reliability is enhanced by reduced self-heating due to low R_CEsat and controlled junction temperature up to 150 °C.

Key Specifications

Pinout & Package

SOT54 (TO-92) plastic single-ended leaded through-hole package with 3 leads; standardized footprint per JEDEC TO-92 outline, compatible with wave soldering and hand assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PBSS5140S, NSS5140SF trades through-hole compatibility for SMT scalability but incurs higher conduction loss, while DXT5140S offers mechanical interchangeability at the cost of marginal V_CEsat and h_FE degradation-both require validation of thermal derating in final layout.

Availability

PBSS5140S is available at Aetrix Electronics and suitable for medium-power switching, linear regulators, and LCD back-lighting applications requiring stable component supply, long-term obsolescence management, and traceable sourcing for industrial and consumer electronics programs.

Supply support for PBSS5140S 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PBSS5140S belongs to NXP's low V_CEsat bipolar transistor family, engineered specifically for energy-efficient switching in battery-powered and thermally constrained systems where traditional transistors incur excessive heat.

FAQ

What is the maximum continuous collector current rating for PBSS5140S?

The PBSS5140S has a maximum continuous collector current (I_C) rating of −1 A under ambient temperature conditions ≤ 25 °C with standard PCB mounting. At elevated ambient temperatures or with reduced copper area, derating applies per the thermal resistance of 150 K/W; for example, at 70 °C ambient, the usable I_C drops to approximately −500 mA to maintain T_j ≤ 150 °C. This rating is validated in the official NXP product data sheet dated 2004 Aug 13.

Does PBSS5140S support high-frequency switching applications?

Yes, the PBSS5140S supports high-frequency switching with a transition frequency (f_T) of 150 MHz at −50 mA collector current and −10 V V_CE. This enables clean edge fidelity in PWM-driven applications up to ~15 MHz fundamental frequency, provided base drive impedance and layout parasitics are minimized. The PBSS5140S datasheet confirms this parameter under defined test conditions, making it suitable for DC/DC converter gate drivers and fast muting circuits.

What is the pin configuration of PBSS5140S and how is it oriented in SOT54?

The PBSS5140S uses a SOT54 (TO-92) package with pin 1 = Base, pin 2 = Collector, and pin 3 = Emitter, viewed from the flat side with leads pointing downward and left-to-right numbering. This orientation is explicitly shown in Figure 1 of the NXP datasheet and matches JEDEC TO-92 mechanical standards. Correct identification is critical because miswiring pin 2 and pin 3 reverses polarity and risks immediate device failure in PNP configurations.

How does PBSS5140S compare to its NPN complement PBSS4140S?

The PBSS5140S is the PNP counterpart to the NPN PBSS4140S, sharing identical voltage (40 V), current (1 A), and thermal (830 mW) ratings, plus matching SOT54 packaging and pinout symmetry. Key differences include polarity inversion-PBSS4140S sinks current from load to ground, while PBSS5140S sources from rail to load-and complementary V_CEsat curves optimized for respective topologies. Both devices are intended for paired use in H-bridge or dual-rail switching designs.

Is PBSS5140S suitable for linear regulator pass transistor applications?

Yes, the PBSS5140S is suitable as a pass transistor in linear regulators due to its high h_FE (160–800), low V_CEsat, and stable gain across load current. Its −500 mV V_CEsat at −1 A limits dropout voltage and improves efficiency over standard PNP transistors, while the 150 °C junction rating supports sustained operation under thermal stress. The PBSS5140S datasheet explicitly lists "linear regulators" in its Applications section, confirming validated use in this mode.