Infineon Technologies BCX55E6327HTSA1

Overview

BCX55E6327HTSA1 from Infineon Technologies is an NPN silicon bipolar junction transistor designed for audio-frequency driver and output stages in automotive and industrial power amplifiers. It features V_CEO = 60 V, I_C = 1 A continuous, V_CE(sat) ≤ 0.5 V at I_C = 500 mA / I_B = 50 mA, h_FE = 40–160 (depending on operating point), and operates up to T_j = 150 °C in SOT-89 package.

For engineers reviewing the BCX55E6327HTSA1 datasheet, BCX55E6327HTSA1 pinout, BCX55E6327HTSA1 application, or BCX55E6327HTSA1 equivalent, key selection criteria include its AEC-Q101 qualification, low saturation voltage for efficient switching, high DC current gain stability across temperature, and complementary PNP pairing with BCX51–BCX53 series in identical SOT-89 footprint.

Technical Context

This transistor is optimized for linear and switching operation in medium-power analog stages. Its design emphasizes thermal robustness (R_thJS ≤ 15 K/W) and stable h_FE over wide collector current range (5 mA to 500 mA), with guaranteed V_(BR)CEO ≥ 60 V and f_T ≥ 100 MHz at I_C = 50 mA / V_CE = 10 V.

The device supports pulse operation up to I_CM = 1.5 A (t_p ≤ 10 ms, D ≤ 2%), and exhibits low leakage (I_CBO ≤ 0.1 µA at 30 V, 25 °C; ≤ 20 µA at 150 °C), enabling reliable performance in thermally constrained PCB layouts.

Key Specifications

Pinout & Package

BCX55E6327HTSA1 is housed in a surface-mount SOT-89 package with standardized 3-pin layout and exposed emitter pad for thermal dissipation. The package meets RoHS requirements and is qualified per AEC-Q101 for automotive use.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCX55-16, this part offers broader h_FE tolerance (25–160) for cost-sensitive designs; versus MJD112, it delivers superior thermal efficiency in space-constrained SOT-89 layouts while maintaining identical voltage/current ratings.

Availability

BCX55E6327HTSA1 is available at Aetrix Electronics and suitable for automotive audio systems, industrial motor controls, LED lighting drivers, and linear power supply designs requiring stable component supply with AEC-Q101 compliance and SOT-89 thermal performance.

Supply support for BCX55E6327HTSA1 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 automotive-qualified bipolar transistor product line, engineered for reliability in engine control units, body electronics, and infotainment power stages.

FAQ

Is BCX55E6327HTSA1 pin-compatible with BCX54 or BCX56?

Yes - all BCX54/55/56 variants share identical SOT-89 pinout (B-C-E) and mechanical footprint. However, V_CEO differs: BCX54 = 45 V, BCX55 = 60 V, BCX56 = 80 V. Substitution requires verifying voltage margin in the target circuit.

What is the maximum allowable base current for continuous operation?

The absolute maximum rated base current is I_B = 100 mA. For reliable long-term operation, keep continuous I_B ≤ 50 mA (as used in V_CE(sat) spec), with peak pulses ≤ 200 mA limited to t_p ≤ 10 ms and duty cycle < 2%.

Does BCX55E6327HTSA1 require a heatsink in typical applications?

Not necessarily - with R_thJS ≤ 15 K/W and P_tot = 2 W at T_S = 120 °C, it can dissipate ~1.2 W on a 1 cm² 2-oz copper pad without external heatsink. Above 1.2 W, a small thermal pad or localized copper pour is recommended.

Can BCX55E6327HTSA1 replace BCX55-10 in existing designs?

Yes - both share identical electrical specs and SOT-89 package. BCX55E6327HTSA1 has h_FE = 40–160 (same as BCX55-10), whereas BCX55-16 has h_FE = 100–160. No layout or bias changes are needed unless the design relies on minimum h_FE ≥ 100.