Infineon Technologies BCX55E6327

Overview

BCX55E6327 from Infineon Technologies is an NPN silicon bipolar junction transistor designed for audio-frequency driver and output stages in linear and switching applications. It features a 60 V collector-emitter breakdown voltage (V_(BR)CEO), 1 A continuous collector current (I_C), 2 W total power dissipation at T_S ≤ 120 °C, and low 0.5 V collector-emitter saturation voltage (V_CE(sat)) at I_C = 500 mA / I_B = 50 mA - enabling efficient amplification in automotive lighting drivers and industrial relay interfaces.

For engineers reviewing the BCX55E6327 datasheet, BCX55E6327 pinout, BCX55E6327 application, or BCX55E6327 equivalent, key selection criteria include its SOT-89 package thermal performance (R_thJS ≤ 15 K/W), DC current gain range of 40–100 at I_C = 150 mA, and AEC-Q101 qualification for automotive-grade reliability under temperature cycling and humidity testing.

Technical Context

This NPN transistor operates in active, saturation, and cutoff regions with defined DC gain (h_FE) across collector currents from 5 mA to 500 mA and V_CE = 2 V. Its transition frequency f_T reaches 100 MHz at I_C = 50 mA / V_CE = 10 V, supporting moderate-speed switching up to ~10 MHz in Class-A/B amplifier stages.

Thermal design relies on junction-to-soldering-point resistance (R_thJS ≤ 15 K/W) and pulse-load derating curves, allowing peak power handling up to 2.4 W for t_p < 300 µs with duty cycle D < 2%. The device is rated for operation from –65 °C to +150 °C junction temperature.

Key Specifications

Pinout & Package

BCX55E6327 is housed in a surface-mount SOT-89 package with three terminals: emitter (pin 3), base (pin 1), and collector (pin 2), where the collector tab is internally connected to pin 2 and serves as the primary thermal path to the PCB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power transistor applications.

Compared with BCX55-16, BCX55E6327 offers identical performance in a standard 1000-piece reel; versus MJD122G, it trades higher voltage/current capability for smaller SOT-89 footprint and lower cost in 12–24 V applications with <1 A load requirements.

Availability

BCX55E6327 is available at Aetrix Electronics and suitable for automotive lighting drivers, industrial relay interfaces, audio amplifier stages, and DC motor speed control circuits requiring stable component supply and AEC-Q101 compliance.

Supply support for BCX55E6327 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 AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs and discrete devices.

The BCX54–BCX56 series belongs to Infineon's legacy bipolar transistor portfolio, engineered specifically for robust, cost-effective AF and switching applications in automotive and industrial environments where reliability under thermal and electrical stress is critical.

FAQ

Is BCX55E6327 RoHS-compliant and lead-free?

Yes, BCX55E6327 is RoHS-compliant and manufactured in a lead-free (Pb-free) package per EU Directive 2011/65/EU. The SOT-89 package uses matte tin plating on leads and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at ≤30 °C/60% RH.

What is the maximum safe operating temperature for BCX55E6327?

The absolute maximum junction temperature is 150 °C, and storage temperature range is –65 °C to +150 °C. For reliable long-term operation, keep T_j ≤ 125 °C using the R_thJS ≤ 15 K/W thermal path and appropriate PCB copper area, especially under pulsed loads exceeding 1 W average power.

Can BCX55E6327 be used in linear regulator pass transistor applications?

Yes - its 60 V V_(BR)CEO, 1 A I_C, and 2 W P_tot support use as a series pass element in adjustable linear regulators up to ~50 V input. However, V_CE(sat) is not specified in linear region; design must ensure h_FE remains ≥25 at target I_C and V_CE > 2 V to avoid second breakdown.

Does BCX55E6327 have built-in ESD protection?

No - BCX55E6327 has no integrated ESD protection diodes. Per datasheet, the emitter-base breakdown voltage is only 5 V, so external 5.1 V Zener clamps or series resistors are required on base lines in environments with >2 kV HBM risk, especially in automotive assembly or field service scenarios.