Nexperia USA Inc. BC856BQB-QZ

Overview

BC856BQB-Q from Nexperia is a PNP general-purpose transistor in a DFN1110D-3 (SOT8015) leadless package, rated for −65 V V_CEO, −100 mA I_C, and DC current gain (h_FE) of 220–475 at V_CE = −5 V and I_C = −2 mA. It delivers low saturation voltage (V_CEsat ≤ −650 mV at I_C = −100 mA, I_B = −5 mA), supports automotive-grade reliability per AEC-Q101, and targets space-constrained switching in infotainment power rails and sensor interface stages.

For engineers reviewing the BC856BQB-Q datasheet, BC856BQB-Q pinout, BC856BQB-Q application, or BC856BQB-Q equivalent, this page provides verified pin functions, thermal derating curves, AOI-compatible side-wettable flank geometry, and direct alternatives with validated h_FE and V_CEO trade-offs - all critical for high-density PCB layout and automotive qualification.

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with defined breakdown limits: −80 V V_CBO, −65 V V_CEO, and −6 V V_EBO. Its h_FE variation across temperature (−55 °C to +150 °C) and collector current (100 µA to 100 mA) is characterized in Figures 4 and 8, enabling precise bias design for linear amplification or digital switching.

Thermal performance is specified for two FR4 mounting conditions: R_th(j-a) = 368 K/W (35 µm copper) and 298 K/W (70 µm copper). Transient thermal impedance curves (Fig. 2–3) support pulse-width modulation design with duty cycles down to 1%, and its 0.48 mm body height enables co-placement with 0201 passives in ultra-thin modules.

Key Specifications

Pinout & Package

DFN1110D-3 (SOT8015) is a 3-terminal, leadless, ultra-thin plastic package with side-wettable flanks for reliable reflow solder joint inspection. Dimensions: 1.1 mm × 1.0 mm × 0.48 mm body, 0.65 mm pitch, and 0.22 mm max flange height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC856B,115 and MMBT3906LT1G, BC856BQB-Q uniquely combines AEC-Q101 qualification, side-wettable flanks for AOI, and −65 V rating - making it the only choice for automotive body electronics and space-constrained industrial controllers requiring zero-defect manufacturing and load-dump resilience.

Availability

BC856BQB-Q is available at Aetrix Electronics and suitable for automotive interior lighting control, industrial sensor signal conditioning, and medical wearable power sequencing requiring stable component supply, full traceability, and long-lifecycle support.

Supply support for BC856BQB-Q 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

BC856BQB-Q belongs to the BC856xQB-Q series of AEC-Q101-qualified PNP transistors designed specifically for space-constrained, high-reliability automotive and industrial switching applications demanding AOI compatibility and extended temperature operation.

FAQ

What is the maximum allowable junction temperature for BC856BQB-Q?

The absolute maximum junction temperature (T_j) is 150 °C, as defined in Table 6 of the datasheet. Operation above this value risks permanent degradation of h_FE and increased leakage. Derating begins at T_amb > 25 °C per Figure 1, with P_tot dropping to 420 mW on 70 µm FR4 and 340 mW on 35 µm FR4 at 25 °C ambient.

Can BC856BQB-Q replace BC856B in existing SOT23 layouts?

No - BC856BQB-Q uses the DFN1110D-3 (SOT8015) package, which is physically incompatible with SOT23 footprints. Its 1.1 mm × 1.0 mm body, 0.65 mm pitch, and side-wettable flanks require a dedicated land pattern (Figure 13). Direct replacement would necessitate PCB redesign and stencil revision.

How does the side-wettable flank design improve manufacturing yield?

The exposed copper flanks on pins 1–3 enable automated optical inspection (AOI) systems to verify solder fillet formation and wetting quality without X-ray. This eliminates blind spots inherent in bottom-terminated packages and reduces field failures caused by head-in-pillow or insufficient solder joint formation in high-speed reflow lines.

Is BC856BQB-Q suitable for linear amplification applications?

Yes - its h_FE stability across −55 °C to +150 °C (Fig. 8), low noise figure (10 dB at 1 kHz), and predictable V_BE vs. I_C characteristics (Fig. 9) support emitter-follower and common-emitter amplifier designs. However, thermal derating must be applied for continuous dissipation above 100 mW to maintain linearity and prevent gain shift.