Nexperia USA Inc. BC857CMB,315

Overview

BC857CMB,315 from Nexperia is a PNP general-purpose bipolar junction transistor in an ultra-small leadless SOT883B package, rated for −45 V V_CEO, −100 mA I_C, and offering h_FE = 420–800 at V_CE = −5 V and I_C = −2 mA. It delivers low-profile switching and amplification in space-constrained mobile and automotive PCBs.

For engineers reviewing the BC857CMB,315 datasheet, BC857CMB,315 pinout, BC857CMB,315 application, or BC857CMB,315 equivalent, this device is selected for high-current-gain PNP switching in battery-powered wearables, AEC-Q101-compliant control nodes, and compact DC-DC feedback paths where package height ≤0.37 mm is critical.

Technical Context

This PNP BJT operates in active and saturation regions with verified V_CE(sat) ≤ −400 mV at I_C = −100 mA / I_B = −5 mA and V_BE = −600 to −820 mV across I_C = −2 to −10 mA. Its f_T = 100 MHz supports moderate-frequency signal conditioning.

Thermal resistance R_th(j-a) = 500 K/W on FR4 ensures stable operation up to T_j = 150 °C, while AEC-Q101 qualification confirms robustness for automotive ambient ranges (−55 °C to +150 °C).

Key Specifications

Pinout & Package

SOT883B is a 3-terminal, leadless plastic package with 0.37 mm maximum height, 1.0 mm × 0.6 mm body, and tin-plated solder lands optimized for 2 mm pitch tape-and-reel handling (packing code -315). Reflow soldering is the only recommended assembly method.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose transistor applications.

Compared with BC847CMB and BC857C,215, BC857CMB,315 uniquely combines AEC-Q101 qualification, ultra-low 0.37 mm height, and high h_FE in a single leadless package-making it irreplaceable for space- and reliability-critical PNP switching in next-gen mobile and automotive edge nodes.

Availability

BC857CMB,315 is available at Aetrix Electronics and suitable for wearable power switching, automotive door module control, USB-C port protection logic, and industrial sensor signal conditioning requiring stable component supply across high-mix, low-volume production runs.

Supply support for BC857CMB,315 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.

The BC857xMB series targets miniaturized, high-reliability PNP switching in space-constrained environments-designed specifically for automotive control units, portable electronics, and industrial sensors where AEC-Q101 compliance and ultra-thin packaging are mandatory.

FAQ

What is the maximum allowable junction temperature for BC857CMB,315?

The absolute maximum junction temperature (T_j) is 150 °C, as defined in Table 6 of the Nexperia datasheet. Operation above this limit risks permanent parametric shift or failure. Derating is required above T_amb = 25 °C per R_th(j-a) = 500 K/W, and thermal design must ensure T_j remains within specification under worst-case power dissipation and ambient conditions.

Can BC857CMB,315 be used in linear amplifier applications?

Yes-it is characterized for DC current gain (h_FE) across I_C = −0.1 to −100 mA and exhibits low noise figure (NF = 10 dB at I_C = −200 µA), supporting Class-A small-signal amplification. However, its primary qualification and characterization focus is switching; for precision analog use, verify linearity and distortion at target bias points using Figures 11–14 in the datasheet.

Is reflow soldering mandatory for BC857CMB,315?

Yes-Nexperia explicitly states in Section 11 that reflow soldering is the only recommended method. The SOT883B package lacks leads and relies on precise thermal profiles for solder land wetting. Wave or hand soldering is not supported and may cause delamination, voiding, or intermetallic failure due to uncontrolled thermal gradients and mechanical stress.

How does the binary marking "0100 0110" identify BC857CMB,315?

This 8-bit laser mark decodes to "0100" (device family identifier for BC857x) and "0110" (gain bin code for 'C' grade, h_FE = 420–800), per Table 5 and Figure 1. It is read top-down, left-to-right on the transparent top view of the SOT883B package, and serves as a machine-readable verification of part number and gain grade during automated optical inspection.