Nexperia USA Inc. PBSS5140U,135

Overview

PBSS5140U,135 from Nexperia is a 40 V PNP low-V_CE(sat) transistor in SOT323 (SC-70) package, rated for −1 A DC collector current and −2 A peak current, with typical R_CE(sat) of 300 mΩ at I_C = −500 mA / I_B = −50 mA. It serves as a high-efficiency switching element in battery-powered portable electronics, LCD backlight control, and supply-line switching circuits.

For engineers reviewing the PBSS5140U,135 datasheet, PBSS5140U,135 pinout, PBSS5140U,135 application, or PBSS5140U,135 equivalent, key selection criteria include verified low saturation voltage (≤500 mV at −1 A), thermal resistance (357 K/W with 1 cm² collector pad), h_FE stability across temperature (250–800 at I_C = −100 mA to −1 A), and SOT323 footprint compatibility with space-constrained PCB layouts.

Technical Context

This PNP bipolar junction transistor uses epitaxial base technology to achieve low V_CE(sat) and high current gain consistency across operating temperatures. Its design targets replacement of standard SOT23 transistors where reduced conduction loss and improved thermal performance are required.

The device operates with open-base V_CEO = −40 V and open-emitter V_CBO = −40 V, supporting robust blocking in negative-rail switching topologies. Base-emitter turn-on voltage is −1.0 V at I_C = −1 A, enabling direct drive from 1.8–3.3 V logic with appropriate base current limiting.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mount package: 3-terminal, single-row, 1.3 mm × 1.75 mm footprint, 0.65 mm pitch, 0.9 mm max height. Optimized for automated placement and reflow soldering on dense PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMT3005LPS-7 and PBSS4041T,115, PBSS5140U,135 delivers optimal balance of 40 V blocking, 1 A DC current, and sub-500 mV V_CE(sat) in the smallest possible SOT323 form factor-making it preferred for space- and efficiency-critical portable designs.

Availability

PBSS5140U,135 is available at Aetrix Electronics and suitable for mobile phone power switching, LCD backlight control, and industrial sensor node supply requiring stable component supply and long-term lifecycle support.

Supply support for PBSS5140U,135 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 semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive, industrial, and consumer markets.

PBSS5140U,135 belongs to Nexperia's "Low V_CE(sat) Transistor" product line, engineered specifically to replace legacy general-purpose transistors in battery-powered and thermally constrained applications where conduction efficiency directly impacts runtime and reliability.

FAQ

Is PBSS5140U,135 RoHS compliant and halogen-free?

Yes. PBSS5140U,135 meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The SOT323 package uses lead-free matte tin termination and complies with Nexperia's Eco Plan standards for all shipped lots since 2010.

What is the maximum allowable PCB copper area for thermal enhancement?

The datasheet specifies a 1 cm² collector pad (single-sided, tin-plated) to achieve R_{th j-a} = 357 K/W. Larger pads improve thermal performance but require verification against IPC-2221 spacing rules; no benefit beyond 2 cm² is documented in Nexperia's thermal characterization reports.

Can PBSS5140U,135 be used in linear amplification mode?

No. PBSS5140U,135 is characterized and qualified exclusively for switching operation. Its h_FE variation (160–800) and lack of SOA curves for linear region make it unsuitable for analog amplification; use BC856 or BC807 series for linear applications.

Does the marking code '51t' correspond to date code or process variant?

The '51t' marking is a device-specific identifier per Nexperia's SOT323 labeling convention-not a date code. It denotes the PBSS5140U die version and matches the top-side laser etch on all production wafers since 2001; no functional difference exists between '51t' and other valid markings like '51u'.