Nexperia USA Inc. BCX51-10,115

Overview

BCX51-10,115 from Nexperia is a PNP medium power transistor in SOT89 surface-mount package, rated for −45 V V_CEO, −1 A continuous collector current, and 0.50 W power dissipation on standard FR4 PCB. It features h_FE = 63–160 at I_C = −150 mA, V_CE = −2 V, and is AEC-Q101 qualified for automotive linear voltage regulators and high-side switches.

For engineers reviewing the BCX51-10,115 datasheet, BCX51-10,115 pinout, BCX51-10,115 application, or BCX51-10,115 equivalent, this device serves as a thermally robust, medium-power PNP switch with defined DC gain binning (−10 suffix), exposed collector pad for thermal management, and validated performance in battery-driven power management circuits.

Technical Context

This discrete PNP bipolar junction transistor operates in linear or saturated switching modes, with base-emitter turn-on voltage of −1 V at I_C = −500 mA and collector-emitter saturation voltage of −0.5 V under I_C/I_B = 10 conditions. Its f_T = 145 MHz supports moderate-frequency amplification and fast switching transitions.

Thermal design relies on the SOT89 package's exposed collector pad: R_th(j-a) is 250 K/W on standard FR4, dropping to 93 K/W with a 6 cm² copper pour-enabling stable operation up to 150 °C junction temperature in automotive ambient profiles.

Key Specifications

Pinout & Package

SOT89 (SC-62/TO-243) plastic surface-mounted package with 3 leads and an exposed collector pad for enhanced thermal and electrical conductivity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium power transistor applications.

Compared with BCX51-10,115, the −16 variant trades gain consistency for lower base drive, while BCP51-10,115 offers 30% higher power handling at the cost of footprint compatibility-making BCX51-10,115 optimal for space-constrained, AEC-Q101–required SOT89 designs.

Availability

BCX51-10,115 is available at Aetrix Electronics and suitable for linear voltage regulators, high-side switches, battery-driven devices, and MOSFET drivers requiring stable component supply in automotive and industrial embedded systems.

Supply support for BCX51-10,115 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 essential semiconductors for automotive, industrial, and consumer markets.

BCX51-10,115 belongs to Nexperia's medium-power discrete transistor product line, engineered for robust performance in automotive-grade power management and switching applications where thermal efficiency and AEC-Q101 compliance are mandatory.

FAQ

What is the maximum allowable junction temperature for BCX51-10,115?

The absolute maximum junction temperature (T_j) is 150 °C per the datasheet Limiting Values table. Operation above this threshold risks permanent degradation. Derating is required above 25 °C ambient-e.g., P_tot drops to 0.95 W with 1 cm² collector copper and to 1.35 W with 6 cm², per Table 6.

How does the SOT89 package improve thermal performance over standard SMD packages?

The SOT89 exposes the collector as a large metal pad soldered directly to the PCB, reducing thermal resistance from junction to ambient (R_th(j-a)) from 250 K/W (standard footprint) to 93 K/W (6 cm² copper pour). This enables 2.7× higher power handling than non-exposed alternatives at the same board area.

Is BCX51-10,115 suitable for switching applications above 100 kHz?

Yes-its 145 MHz transition frequency (f_T) supports clean switching at 100 kHz PWM with minimal storage time delay. However, V_CE(sat) = −0.5 V at I_C/I_B = 10 indicates it is optimized for moderate-speed, high-current saturation-not RF or ultrafast edge rates.

What does the "−10" suffix indicate in BCX51-10,115?

The "−10" denotes the h_FE gain bin: guaranteed 63–160 at V_CE = −2 V and I_C = −150 mA. This binning enables predictable DC bias design in linear regulators and amplifiers, unlike unmarked parts with wider 63–250 spread.