Infineon Technologies BCX5516H6433XTMA1

Overview

BCX5516H6433XTMA1 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 = 63–100 at I_C = 150 mA, and operates up to T_j = 150 °C in SOT-89 package.

For engineers reviewing the BCX5516H6433XTMA1 datasheet, BCX5516H6433XTMA1 pinout, BCX5516H6433XTMA1 application, or BCX5516H6433XTMA1 equivalent, key selection criteria include its guaranteed h_FE range at high current, low saturation voltage under switching load, thermal resistance (R_thJS ≤ 15 K/W), AEC-Q101 qualification, and complementary PNP pairing with BCX52 series.

Technical Context

This transistor operates as a medium-power linear or switching amplifier stage, optimized for stable DC gain across temperature (h_FE maintained ≥25 at 100 °C) and low-loss conduction. Its V_CE(sat) and V_BE(ON) are characterized at I_C = 500 mA, supporting efficient Class AB audio output drive.

The device uses epitaxial planar technology with Pb-free (RoHS-compliant) metallization and meets AEC-Q101 stress test requirements for automotive underhood applications. Thermal design relies on direct heatsink mounting via the collector-tab (Pin 2) in the SOT-89 package.

Key Specifications

Pinout & Package

SOT-89 package with molded plastic body, exposed collector tab (Pin 2) for thermal and electrical connection, and standard 3-pin leadframe layout. Mounting requires soldering Pin 2 directly to a thermal pad.

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 identical performance in a different reel configuration; versus MJD122G, it delivers superior thermal efficiency and tighter gain control at lower voltage stress-making it optimal for compact, high-reliability automotive amplifiers.

Availability

BCX5516H6433XTMA1 is available at Aetrix Electronics and suitable for automotive audio systems, industrial motor controllers, LED drivers, and linear power supplies requiring stable component supply with AEC-Q101 compliance and RoHS certification.

Supply support for BCX5516H6433XTMA1 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.

This transistor belongs to the BCX54–BCX56 family of AEC-Q101-qualified NPN/PNP AF transistors, engineered for robust, thermally efficient linear and switching power stages in harsh-environment applications.

FAQ

Is BCX5516H6433XTMA1 pin-compatible with BCX55-16?

Yes-both share identical SOT-89 package outline, pin assignment (B-C-E), and mechanical dimensions. The "H6433XTMA1" suffix denotes Infineon's specific tape-and-reel configuration (4,000 pcs/reel, 18 mm tape width) and date code format, not electrical or physical differences.

What is the maximum allowable base current for continuous operation?

The absolute maximum rated base current is I_B = 100 mA (DC), with peak limit I_BM = 200 mA for pulses ≤10 ms. For reliable long-term operation at I_C = 1 A, design base drive to deliver 50–80 mA to ensure h_FE-based saturation while avoiding secondary breakdown.

Does this transistor require a heatsink in typical 500 mA applications?

At I_C = 500 mA and V_CE = 0.5 V, power dissipation is 0.25 W. With R_thJS ≤ 15 K/W and ambient ≤ 70 °C, junction temperature stays below 110 °C using only a 2 cm² 2-oz copper pad-no external heatsink required unless ambient exceeds 85 °C or duty cycle approaches 100%.

Can BCX5516H6433XTMA1 be used as a direct replacement for BCX54 in existing designs?

No-BCX54 has V_CEO = 45 V and lower h_FE (25–100). Substituting BCX5516H6433XTMA1 may improve voltage margin and gain stability but requires verification of circuit safety margins, especially in inductive load switching where V_CEO derating applies.