Infineon Technologies BCX53H6327XTSA1

Overview

BCX53H6327XTSA1 from Infineon Technologies is a PNP silicon bipolar junction transistor designed for audio-frequency driver and output stages in linear and switching applications. It features 80 V V_CEO, 1 A continuous collector current, 0.5 V V_CE(sat) at I_C = 500 mA / I_B = 50 mA, and 125 MHz f_T, enabling use in low-saturation, medium-power amplification circuits such as power supply error amplifiers and relay drivers.

For engineers reviewing the BCX53H6327XTSA1 datasheet, BCX53H6327XTSA1 pinout, BCX53H6327XTSA1 application, or BCX53H6327XTSA1 equivalent, key selection criteria include verified V_CEO/V_CBO ratings, h_FE consistency across I_C = 5–500 mA, thermal resistance (R_thJS ≤ 15 K/W), SOT-89 package mechanical compatibility, and complementary NPN pairing with BCX56 variants.

Technical Context

This PNP BJT operates in active, saturation, and cutoff regions with DC current gain (h_FE) ranging from 63 to 250 depending on collector current and variant suffix (e.g., BCX53-10 vs. BCX53-16). Its low V_CE(sat) and high f_T support efficient operation in Class-A/B audio pre-drivers and feedback control loops where linearity and bandwidth are critical.

The device meets AEC-Q101 qualification for automotive-grade reliability and uses Pb-free (RoHS-compliant) SOT-89 packaging with defined thermal path from junction to soldering point (R_thJS ≤ 15 K/W), enabling stable performance up to T_j = 150 °C under pulsed or DC bias conditions.

Key Specifications

Pinout & Package

SOT-89 package: surface-mount, 3-pin plastic case with exposed emitter pad for thermal enhancement and mechanical anchoring. Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter (confirmed per Infineon package outline EHP00437 and marking layout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BCX53H6327XTSA1, the -16 variant offers tighter h_FE distribution for reduced base drive variance, while BCX56 provides matched NPN functionality but demands PCB redesign due to reversed pin assignment and polarity.

Availability

BCX53H6327XTSA1 is available at Aetrix Electronics and suitable for automotive relay drivers, audio amplifier stages, switching regulator error amplifiers, and industrial sensor signal conditioning requiring stable component supply and AEC-Q101 compliance.

Supply support for BCX53H6327XTSA1 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 BCX5x series belongs to Infineon's general-purpose bipolar transistor product line, engineered for robust, cost-effective linear and switching functions in automotive, industrial, and consumer power systems.

FAQ

Is BCX53H6327XTSA1 pin-compatible with BCX53-10 or BCX53-16 variants?

Yes - all BCX53 variants (including -10, -16, and H6327XTSA1) share identical SOT-89 pinout (Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter) and mechanical footprint. Only h_FE binning differs; no PCB layout change is required when substituting within the BCX53 family.

What is the maximum permissible continuous power dissipation at 25°C ambient?

At T_A = 25°C with no heatsink, P_tot is limited by junction temperature: using R_thJA ≈ 200 K/W (per AN077), max P_tot ≈ (150 − 25)/200 = 0.625 W. With PCB copper pour improving R_thJA to ~60 K/W, dissipation rises to ~2.1 W - still within the 2 W absolute maximum rating at T_S ≤ 120°C.

Does BCX53H6327XTSA1 support operation above 100°C junction temperature?

No - the absolute maximum junction temperature is 150°C, but electrical characteristics (especially h_FE and V_CE(sat)) are only guaranteed from −65°C to +150°C. Operation above 100°C requires derating I_C and verifying thermal design with R_thJS ≤ 15 K/W and adequate board copper area to avoid exceeding T_j = 150°C.

Can BCX53H6327XTSA1 be used as a direct replacement for BCX53-16 in existing designs?

Yes - BCX53H6327XTSA1 and BCX53-16 share identical electrical specifications except h_FE min/max ranges (63–160 vs. 160–250). If the original design operates reliably with h_FE ≥ 63, substitution is safe; if it relies on h_FE ≥ 160, validation of base drive margin is recommended.