Infineon Technologies BC 856BW E6433

Overview

BC856BW E6433 from Nexperia is a PNP silicon small-signal transistor in SOT323 package, rated for V_CEO = 65 V, I_C = 100 mA, and P_tot = 250 mW at T_S ≤ 124 °C. It delivers high DC current gain (h_FE = 125–420), low V_CE(sat) (≤ 300 mV @ I_C = 10 mA/I_B = 0.5 mA), and low noise (F = 1–4 dB @ 1 kHz), optimized for audio-frequency input stages and driver circuits in automotive and industrial control modules.

For engineers reviewing the BC856BW E6433 datasheet, BC856BW E6433 pinout, BC856BW E6433 application, or BC856BW E6433 equivalent, key selection criteria include its AEC-Q101 qualification, RoHS-compliant SOT323 footprint, complementary pairing with BC846–BC850 NPN series, and verified performance in low-voltage biasing and signal amplification where V_BE(sat) ≤ 850 mV and f_T ≥ 250 MHz are critical.

Technical Context

This PNP transistor operates in linear and switching modes with guaranteed h_FE groups (A/B/C) defined at I_C = 10 µA and 2 mA, V_CE = 5 V. Its low C_cb (1.5 pF typ.) and C_eb (8 pF typ.) support stable high-frequency response up to 250 MHz, while thermal resistance R_thJS ≤ 105 K/W enables reliable operation in compact PCB layouts with limited heatsinking.

The device meets AEC-Q101 stress testing for automotive electronics and features Pb-free construction. Its V_(BR)EBO = 5 V and I_CBO ≤ 0.015 µA at 150 °C ensure robustness in temperature-critical bias networks and discrete amplifier front-ends requiring low leakage and tight gain matching.

Key Specifications

Pinout & Package

BC856BW E6433 is housed in a RoHS-compliant SOT323 (SC-70) plastic surface-mount package with standard 3-pin configuration and 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal transistor applications.

Compared with BC856BW E6433, BC857BW trades 20 V breakdown headroom for improved saturation performance, while MMBT3906LT1G offers broader industry availability but sacrifices thermal efficiency and AEC-Q101 validation-making BC856BW optimal for new automotive designs requiring both ruggedness and precision biasing.

Availability

BC856BW E6433 is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC input stages, audio pre-amplifiers, and power supply enable circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC856BW E6433 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 discrete and logic devices, with leadership in automotive-grade components and energy-efficient solutions.

The BC856...-BC860... series was engineered specifically for AEC-Q101-compliant signal conditioning and switching in automotive body electronics and industrial control systems where low noise, consistent h_FE, and thermal resilience are mandatory.

FAQ

Is BC856BW E6433 pin-compatible with BC846B or other NPN counterparts?

No-BC856BW is a PNP transistor with Base-Emitter-Collector pinout (1-2-3), while BC846B is NPN with identical SOT323 pin assignment but opposite polarity. Direct substitution would reverse bias conditions and cause circuit failure. Complementary use requires intentional topology adaptation, not pin-for-pin replacement.

What is the maximum operating temperature for continuous DC operation?

The junction temperature limit is 150 °C, and the package's thermal resistance R_thJS ≤ 105 K/W allows continuous DC operation up to 250 mW at T_S ≤ 124 °C. Derating is required above this case temperature per the P_tot vs. T_S curve in Figure 8 of the datasheet.

Does BC856BW E6433 support pulse operation beyond its DC power rating?

Yes-pulse operation up to P_tot(max)/P_tot(DC) = 5× is permitted for t_p ≤ 100 µs and duty cycle D ≤ 0.05, as shown in Figure 7. This enables brief peak-current events such as inrush limiting or transient sensing without exceeding thermal limits.

How does the h_FE grouping affect circuit design?

h_FE groups A (125–220), B (220–420), and C (420–800) allow designers to select transistors with tightly bounded current gain for predictable biasing. Group B is most common for general-purpose amplification; Group C suits high-gain current mirrors where variation must stay below ±10%.