Nexperia USA Inc. BC856B/DG/B3,215

Overview

BC856B/DG/B3,215 from Nexperia is a PNP general-purpose bipolar junction transistor (BJT) in SOT23 (TO-236AB) package, designed for low-voltage switching and linear amplification at ≤100 mA collector current and ≤65 V collector-emitter voltage. It delivers DC current gain (h_FE) of 220–475 at V_CE = −5 V, I_C = −2 mA, with V_CE(sat) ≤ −650 mV at I_C = −100 mA / I_B = −5 mA, and is widely used in discrete logic-level signal inversion and load switching in consumer power management circuits.

For engineers reviewing the BC856B/DG/B3,215 datasheet, BC856B/DG/B3,215 pinout, BC856B/DG/B3,215 application, or BC856B/DG/B3,215 equivalent, this page provides verified pin configuration, thermal resistance (R_th(j-a) = 500 K/W), saturation voltage behavior across temperature, h_FE distribution bands, and validated alternatives for cost-optimized or performance-matched BJT replacement in space-constrained SMT designs.

Technical Context

This PNP transistor operates in active, saturation, and cutoff regions with defined absolute maximum ratings: V_CEO = −65 V, I_C = −100 mA, P_tot = 250 mW at T_amb ≤ 25 °C on FR4 PCB. Its h_FE binning (220–475) ensures predictable current amplification in bias-stable amplifier stages and digital switch drivers.

Thermal performance is characterized by R_th(j-a) = 500 K/W under standard mounting conditions, and transient thermal impedance curves confirm stable pulse operation up to 200 mA peak with duty cycles ≤ 0.02. V_BE(sat) remains ≤ −850 mV at I_C = −100 mA / I_B = −5 mA, enabling reliable turn-on in low-base-drive applications.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) surface-mount plastic package with 3 leads, 1.9 mm × 1.1 mm footprint, 0.45 mm lead pitch, and 0.9 mm 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 general-purpose transistor applications.

Compared with BC856B/DG/B3,215, BC857B,215 trades 20 V voltage headroom for identical gain and cost, while MMBT3906LT1G offers improved thermal resistance but narrower h_FE and voltage range - making BC856B/DG/B3,215 optimal for 60 V-tolerant, gain-stable, cost-sensitive SMT switching.

Availability

BC856B/DG/B3,215 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, power rail sequencing, and audio signal inversion requiring stable component supply, consistent h_FE binning, and SOT23 footprint compatibility.

Supply support for BC856B/DG/B3,215 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 - delivering discrete, logic, and MOSFET solutions with industry-leading quality and efficiency.

The BC856 series belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-effective, space-efficient switching and amplification in consumer, industrial, and communication equipment where robustness and repeatability are critical.

FAQ

What is the maximum allowable collector-emitter voltage for BC856B/DG/B3,215?

The absolute maximum collector-emitter voltage (V_CEO) is −65 V with the base open, as specified in Table 6 of the Nexperia datasheet Rev. 9. This rating applies at T_amb ≤ 25 °C and must be derated linearly above 25 °C per the thermal characteristics table - no operation beyond −65 V is permitted even for transient pulses.

How does the h_FE range of BC856B/DG/B3,215 impact base resistor selection?

With h_FE spanning 220–475 at V_CE = −5 V and I_C = −2 mA, base resistors must be sized for worst-case gain (220) to guarantee saturation at full load. For example, driving I_C = −100 mA requires I_B ≥ −455 µA, so a 6.8 kΩ resistor from 3.3 V GPIO yields ≥485 µA - ensuring reliable turn-on across all units.

Can BC856B/DG/B3,215 be used in linear amplifier configurations?

Yes - its specified h_FE, V_BE linearity (Fig. 7), and f_T = 100 MHz support Class-A and emitter-follower amplifier use at frequencies up to 10 MHz. However, thermal resistance (500 K/W) limits continuous dissipation to 250 mW, requiring careful heatsinking or power derating above 50 mW in ambient >50 °C.

Is BC856B/DG/B3,215 automotive-qualified?

No - per Revision History section 13 and Legal Information section "Non-automotive qualified products", BC856B/DG/B3,215 is not qualified to AEC-Q101 or any automotive standard. Nexperia explicitly states in Rev. 9 that this part changed to non-automotive qualification in v.8 (2021), and automotive alternatives must be selected from their dedicated −Q product line.