Infineon Technologies BCX70HE6433HTMA1

Overview

BCX70HE6433HTMA1 from Infineon Technologies is an NPN silicon small-signal transistor in SOT-23 package, designed for audio-frequency input stages and driver circuits. It delivers h_FE = 200–330 at I_C = 2 mA, V_CE = 5 V; V_CEO = 45 V; V_CE(sat) ≤ 0.25 V at I_C = 50 mA, I_B = 1.25 mA; and f_T = 250 MHz - enabling low-noise amplification in portable audio preamps.

For engineers reviewing the BCX70HE6433HTMA1 datasheet, BCX70HE6433HTMA1 pinout, BCX70HE6433HTMA1 application, or BCX70HE6433HTMA1 equivalent, key selection criteria include DC current gain group H (200–330), low V_CE(sat) for efficient switching, RoHS-compliant SOT-23 footprint, and AEC-Q101 qualification for automotive signal conditioning.

Technical Context

This transistor operates as a linear amplifier or saturated switch in low-power analog and digital interface stages. Its h_FE group H ensures consistent gain across production lots at I_C = 2 mA and I_C = 50 mA test points, while its 250 MHz f_T supports stable operation up to mid-AF range (≤15 kHz) with minimal phase shift.

The device features low noise figure (F = 2 dB typ. at I_C = 200 µA, f = 1 kHz, ∆f = 200 Hz, R_S = 2 kΩ) and low C_cb = 0.95 pF, making it suitable for high-fidelity preamplifier inputs where signal integrity and source impedance matching are critical.

Key Specifications

Pinout & Package

BCX70HE6433HTMA1 uses the standard SOT-23 plastic surface-mount package (3-pin, 1.3 mm × 2.9 mm × 1.0 mm), with lead-free (RoHS-compliant) terminations and qualified per AEC-Q101 for automotive use.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Compared with BCX70G and BC847BH6327XTSA1, BCX70HE6433HTMA1 offers optimal balance of gain consistency (200–330), low saturation voltage (≤0.25 V), and AEC-Q101 qualification - making it preferred for automotive audio and industrial sensor interfaces requiring long-term parametric stability.

Availability

BCX70HE6433HTMA1 is available at Aetrix Electronics and suitable for automotive cabin microphones, industrial 4–20 mA signal conditioners, and portable audio line drivers requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for BCX70HE6433HTMA1 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 is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs and discrete devices.

BCX70 belongs to Infineon's legacy BCW/BCX family of general-purpose bipolar transistors, engineered for reliable AF amplification and switching in cost-sensitive, high-volume automotive and industrial applications.

FAQ

What is the maximum operating junction temperature for BCX70HE6433HTMA1?

The absolute maximum junction temperature is 150 °C, with derated power dissipation above 71 °C case temperature. Thermal resistance R_thJS is ≤240 K/W, enabling operation up to 125 °C ambient in properly ventilated PCB layouts with copper pour heatsinking.

Is BCX70HE6433HTMA1 suitable for switching applications?

Yes - its V_CE(sat) ≤0.25 V at I_C = 50 mA and I_B = 1.25 mA, combined with fast turn-on/off times (t_on/t_off < 100 ns typical), supports reliable operation in 10–100 kHz discrete switch-mode circuits like LED dimmers and relay drivers.

How does the h_FE group H differ from other BCX70 variants?

Group H specifies h_FE = 200–330 at I_C = 2 mA and V_CE = 5 V, distinguishing it from group G (100–140), group J (250–380), and group K (300–460). This binning ensures predictable biasing in production-grade audio amplifiers without manual gain trimming.

Does BCX70HE6433HTMA1 require external ESD protection?

No dedicated on-chip ESD protection is specified; however, its SOT-23 package and internal structure provide inherent robustness to ≥2 kV HBM per JEDEC JESD22-A114. For direct board-level ESD exposure (e.g., connector-facing circuits), external TVS diodes remain recommended.