Infineon Technologies BCX51E6327HTSA1

Overview

BCX51E6327HTSA1 from Infineon Technologies is a PNP silicon bipolar junction transistor (BJT) designed for audio-frequency driver and output stages in linear and switching applications. It features 45 V V_CEO, 1 A continuous collector current, 2 W total power dissipation at T_S ≤ 120 °C, and low 0.5 V V_CE(sat) at I_C = 500 mA / I_B = 50 mA. It is used in automotive lighting control modules requiring robust thermal performance and high-current switching.

For engineers reviewing the BCX51E6327HTSA1 datasheet, BCX51E6327HTSA1 pinout, BCX51E6327HTSA1 application, or BCX51E6327HTSA1 equivalent, key selection criteria include V_CEO rating, h_FE consistency across I_C range, thermal resistance R_thJS ≤ 15 K/W, and SOT-89 package compatibility with board-level thermal management.

Technical Context

This PNP BJT operates in active, saturation, and cutoff regions with DC current gain h_FE ranging from 25 to 250 depending on I_C (5 mA to 500 mA) and V_CE = 2 V. Its transition frequency f_T is 125 MHz at I_C = 50 mA, V_CE = 10 V, enabling use in medium-speed switching and AF amplification.

Thermal design is constrained by R_thJS ≤ 15 K/W and maximum junction temperature of 150 °C. Pulse operation supports I_CM = 1.5 A for t_p ≤ 10 ms with duty cycle-dependent derating per Infineon's permissible pulse load curves.

Key Specifications

Pinout & Package

BCX51E6327HTSA1 is housed in a surface-mount SOT-89 package with three leads: emitter (pin 1), collector (pin 2), base (pin 3). The package provides mechanical stability and thermal conduction via the exposed collector tab.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCX51-16, BCX51E6327HTSA1 offers full AEC-Q101 traceability and automotive-grade lot control; compared with MMBT5087, it delivers 3.3× higher current capability and 1.5× higher voltage rating-critical for under-hood reliability.

Availability

BCX51E6327HTSA1 is available at Aetrix Electronics and suitable for automotive lighting control, industrial relay drivers, audio power amplifier stages, and DC motor speed control requiring stable component supply and AEC-Q101 compliance.

Supply support for BCX51E6327HTSA1 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 sensor solutions, with global manufacturing and R&D centers.

BCX51E6327HTSA1 belongs to Infineon's BCX51–BCX53 family of general-purpose PNP transistors, engineered for high-reliability linear and switching applications in automotive and industrial environments.

FAQ

What is the maximum allowable base current for continuous operation?

The absolute maximum DC base current is 100 mA per Infineon's datasheet. For reliable long-term operation, design base drive to maintain I_B ≤ 50 mA at steady state, ensuring h_FE remains within its specified range and avoiding localized heating at the base-emitter junction.

Can BCX51E6327HTSA1 be used in a common-base configuration?

Yes-it supports common-base operation with V_CB = 45 V max and I_C = 1 A. However, its h_FE is optimized for common-emitter use; in common-base, current gain α ≈ 0.98–0.995, requiring careful attention to input impedance matching and signal source capability.

Is thermal pad connection required for the SOT-89 collector tab?

Yes-the collector (pin 2) is internally connected to the exposed metal tab. To achieve R_thJS ≤ 15 K/W, the tab must be soldered to a minimum 100 mm² copper pour with ≥2 thermal vias to inner ground/power planes. Omitting this compromises power handling and accelerates parametric drift.

How does BCX51E6327HTSA1 compare to BCX52 and BCX53 variants?

BCX51E6327HTSA1 has V_CEO = 45 V and V_CBO = 45 V; BCX52 offers 60 V ratings; BCX53 offers 80 V/100 V. All share identical SOT-89 package, I_C = 1 A, and thermal specs. Select BCX51 for 12 V automotive systems; BCX52/53 for 24 V or higher transient-prone applications.