Infineon Technologies BCX55H6327XTSA1

Overview

BCX55H6327XTSA1 from Infineon Technologies is an NPN silicon bipolar junction transistor designed for audio-frequency driver and output stages in automotive and industrial power amplification circuits. It features a 60 V collector-emitter breakdown voltage (V_(BR)CEO), 1 A continuous collector current (I_C), 0.5 V collector-emitter saturation voltage at I_C = 500 mA / I_B = 50 mA, and DC current gain (h_FE) of 40–100 at I_C = 150 mA. It is RoHS-compliant and AEC-Q101 qualified.

For engineers reviewing the BCX55H6327XTSA1 datasheet, BCX55H6327XTSA1 pinout, BCX55H6327XTSA1 application, or BCX55H6327XTSA1 equivalent, key selection criteria include its SOT-89 package thermal resistance (R_thJS ≤ 15 K/W), low V_CE(sat), high I_C capability, and AEC-Q101 qualification for automotive-grade reliability under 150 °C junction temperature.

Technical Context

This NPN BJT operates as a linear or switching amplifier in medium-power AF stages, with base-emitter turn-on voltage (V_BE(ON)) of ~1 V at I_C = 500 mA and transition frequency (f_T) of 100 MHz at I_C = 50 mA / V_CE = 10 V. Its complementary PNP counterparts are BCX51–BCX53 series.

The device supports pulsed operation up to I_CM = 1.5 A (t_p ≤ 10 ms) and maintains stable h_FE across –50 °C to +100 °C, with ICBO leakage ≤ 0.1 µA at 30 V and ≤ 20 µA at 150 °C - critical for thermally demanding engine control modules.

Key Specifications

Pinout & Package

SOT-89 (SC-74A) surface-mount plastic package with exposed emitter pad for thermal enhancement; 3-pin configuration with standardized lead pitch (1.27 mm) and footprint per Infineon outline drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCX55-16 and MJD112, BCX55H6327XTSA1 uniquely combines AEC-Q101 qualification, SOT-89 thermal efficiency, and optimized 60 V/1 A ratings for space-constrained automotive audio and actuator drivers - making it irreplaceable where both reliability and thermal density are design-critical.

Availability

BCX55H6327XTSA1 is available at Aetrix Electronics and suitable for automotive audio amplifiers, engine control module drivers, and industrial power supplies requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BCX55H6327XTSA1 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 family was developed specifically for AEC-Q101-compliant medium-power linear and switching applications in automotive subsystems - emphasizing thermal robustness, low saturation voltage, and reliability under extended temperature stress.

FAQ

Is BCX55H6327XTSA1 pin-compatible with BCX54 or BCX56?

No - all three share identical SOT-89 pinout (B-C-E), but they differ in voltage ratings: BCX54 is 45 V, BCX55 is 60 V, and BCX56 is 80 V V_(BR)CEO. Substitution requires verification of maximum system voltage margins and derating curves for safe operation.

What is the maximum allowable PCB copper area for thermal relief on the emitter pad?

Infineon recommends ≥ 100 mm² of 2-oz copper connected directly to the emitter pad (Pin 3) with ≥ 4 thermal vias (0.3 mm diameter, filled) to an internal ground plane. This achieves R_thJA ≈ 120 K/W in standard 4-layer boards, supporting full 1 A continuous operation at 70 °C ambient.

Does BCX55H6327XTSA1 support pulse-width modulation at 20 kHz?

Yes - with f_T = 100 MHz and typical switching times t_on/t_off < 100 ns (measured at I_C = 500 mA), it fully supports 20 kHz PWM for motor and lighting control. Base drive must provide ≥ 50 mA peak current with < 100 Ω source impedance to maintain clean edges.

Can BCX55H6327XTSA1 replace BC337-40 in existing designs?

Only with layout and thermal review: BCX55 offers higher I_C (1 A vs. 0.8 A), lower V_CE(sat) (0.5 V vs. 0.7 V), and AEC-Q101 qualification, but uses SOT-89 instead of TO-92. PCB footprint, thermal path, and base resistor values must be updated to match the improved performance and package differences.