Infineon Technologies BC 850BF E6327

Overview

BC850BF E6327 from Infineon Technologies is an NPN silicon general-purpose bipolar junction transistor (BJT) designed for audio-frequency input stages and driver circuits. It delivers high DC current gain (h_FE = 420–520 at I_C = 2 mA), low V_CE(sat) (max 250 mV at I_C = 10 mA / I_B = 0.5 mA), and low noise (F = 1.2–4 dB, V_n = 0.135 µV at 10–50 Hz), making it suitable for low-noise preamplifier and signal conditioning applications in automotive and industrial electronics.

For engineers reviewing the BC850BF E6327 datasheet, BC850BF E6327 pinout, BC850BF E6327 application, or BC850BF E6327 equivalent, key selection criteria include its AEC-Q101 qualification, SOT-23 package compatibility, V_CEO = 45 V rating, f_T = 250 MHz transition frequency, and complementary PNP pairing with BC856–BC860 series devices.

Technical Context

This transistor operates as a linear amplifying device in common-emitter configuration, optimized for stable small-signal gain across 30 Hz–15 kHz audio band. Its h_FE grouping (B/C variants), low C_cb (0.95 pF typ) and C_eb (9 pF typ), and tight V_BE(on) (580–770 mV) support predictable biasing in discrete amplifier and switching driver topologies.

Thermal performance is defined by R_thJS ≤ 240 K/W (SOT-23), enabling reliable operation up to T_j = 150 °C. The device supports pulsed operation with duty cycle-dependent derating per JEDEC JESD22-A108, validated under AEC-Q101 stress testing for automotive-grade reliability.

Key Specifications

Pinout & Package

BC850BF E6327 is housed in a RoHS-compliant SOT-23 plastic surface-mount package (JEDEC TO-236AB), with standard 1.3 mm × 2.9 mm footprint and 0.95 mm height. Pin assignment follows JEDEC MO-178AA standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC847BF E6327 and MMBT3904LT1G, BC850BF E6327 provides superior noise performance, higher gain consistency, and guaranteed automotive qualification-making it the preferred choice for safety-critical or high-fidelity analog signal paths where long-term parametric stability matters.

Availability

BC850BF E6327 is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor interfaces, and audio equipment requiring stable component supply and long-lifecycle availability.

Supply support for BC850BF E6327 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs and discrete devices.

The BC846–BC850 family was developed specifically for AEC-Q101-compliant discrete amplification and switching in harsh-environment automotive subsystems, emphasizing low noise, gain stability, and thermal resilience.

FAQ

Is BC850BF E6327 pin-compatible with BC847BF E6327?

Yes-both use identical SOT-23 package and pinout (Emitter-Base-Collector on pins 1-2-3). However, BC850BF offers higher h_FE (420–520 vs. 110–250) and higher P_tot (330 mW vs. 250 mW), so substitution may require revalidation of bias stability and thermal margins in existing designs.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current is 5 mA (per datasheet Section 3), but for continuous DC operation, I_B should be limited to ≤1 mA to maintain T_j ≤ 150 °C with typical PCB copper area. At I_C = 100 mA and h_FE = 450, required I_B is ~222 µA-well within safe margin.

Does BC850BF E6327 support operation at 150 °C junction temperature?

Yes-the datasheet specifies T_j = 150 °C as the absolute maximum junction temperature, and AEC-Q101 qualification includes 1000-hour high-temperature operating life (HTOL) testing at T_j = 150 °C, confirming functional integrity under sustained thermal stress.

Can BC850BF E6327 replace BC850C in existing designs?

Yes-BC850BF and BC850C share identical V_CEO, V_CE(sat), and f_T specs, but BF denotes SOT-23 packaging while C indicates gain group. The "BF" suffix confirms both package and gain bin; no circuit modification is needed unless the original design relied on SOT-323 mechanical fit.