Nexperia USA Inc. BC856B/DG/B4VL

Overview

BC856B/DG/B4VL from Nexperia is a PNP general-purpose bipolar junction transistor in SOT23 (TO-236AB) package, rated for −65 V V_CEO, −100 mA I_C, and 220–475 h_FE at V_CE = −5 V, I_C = −2 mA. It serves as a low-voltage switching or linear amplification device in discrete bias networks, level shifters, and signal inversion stages of industrial control logic.

For engineers reviewing the BC856B/DG/B4VL datasheet, BC856B/DG/B4VL pinout, BC856B/DG/B4VL application, or BC856B/DG/B4VL equivalent, key selection criteria include guaranteed h_FE range, V_CEO rating, saturation voltage at I_C/I_B = 20, thermal resistance on FR4 PCB, and SOT23 footprint compatibility with automated placement.

Technical Context

This PNP BJT operates in active, saturation, and cutoff regions with fixed current-controlled gain behavior. Its DC current gain (h_FE) is specified between 220 and 475 at V_CE = −5 V and I_C = −2 mA, and its V_CE(sat) remains ≤ −650 mV at I_C = −100 mA and I_B = −5 mA. The device exhibits 4.5 pF collector capacitance at V_CB = −10 V and f = 1 MHz.

Thermal performance is defined for mounting on single-sided FR4 PCB with 35 µm tin-plated copper, yielding R_th(j-a) = 500 K/W in free air. Absolute maximum ratings include −65 V V_CEO, −80 V V_CBO, −5 V V_EBO, and 250 mW P_tot at T_amb ≤ 25 °C.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm body, 0.9 mm height, and standard reflow footprint per Fig. 15.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC857B and MMBT3906, BC856B/DG/B4VL offers superior −65 V V_CEO headroom and tighter h_FE binning-critical for robust biasing in 48 V industrial systems and repeatable switching thresholds in safety-critical status indicators.

Availability

BC856B/DG/B4VL is available at Aetrix Electronics and suitable for industrial control logic, sensor interface circuits, and LED driver modules requiring stable component supply and long-term obsolescence management.

Supply support for BC856B/DG/B4VL 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, mobile, and computing markets.

The BC856 series belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-effective, space-constrained discrete signal conditioning and switching in non-automotive industrial and consumer equipment.

FAQ

What is the maximum continuous collector current for BC856B/DG/B4VL?

The maximum continuous collector current (I_C) is −100 mA at T_amb ≤ 25 °C on a standard FR4 PCB. Derating is required above 25 °C ambient, following the 500 K/W thermal resistance curve; at 70 °C ambient, usable I_C drops to approximately −65 mA to maintain T_j ≤ 150 °C.

Is BC856B/DG/B4VL suitable for automotive applications?

No. BC856B/DG/B4VL is explicitly designated as non-automotive qualified per Nexperia's Rev. 9 data sheet. It lacks AEC-Q101 qualification, automotive-grade screening, and extended temperature validation. For automotive use, Nexperia recommends the −Q qualified variants such as BC856B-Q.

How does the h_FE binning of BC856B compare to BC856A?

BC856B has h_FE = 220–475 at V_CE = −5 V, I_C = −2 mA, while BC856A is binned 125–250. The B-grade provides higher minimum gain, reducing required base drive current and improving noise immunity in low-power bias networks where consistent turn-on behavior is critical.

What is the recommended soldering profile for BC856B/DG/B4VL?

The device uses standard SOT23 reflow footprint (Fig. 15) with 0.6 mm solder land width and 0.7 mm solder paste stencil opening. Peak reflow temperature must not exceed 260 °C for ≤10 seconds, per JEDEC J-STD-020. Wave soldering is supported using Fig. 16 footprint with preferred transport direction aligned to pin 1–3 axis.