Infineon Technologies BCX70KE6327HTSA1

Overview

BCX70KE6327HTSA1 from Infineon Technologies is an NPN silicon bipolar junction transistor designed for audio-frequency input stages and driver applications. It delivers V_CEO = 45 V, h_FE = 250–500 (at I_C = 2 mA), V_CE(sat) ≤ 0.25 V (at I_C = 50 mA), and low noise of 2 dB (f = 1 kHz, ∆f = 200 Hz, R_S = 2 kΩ), enabling high-fidelity signal amplification in compact analog front-ends.

For engineers reviewing the BCX70KE6327HTSA1 datasheet, BCX70KE6327HTSA1 pinout, BCX70KE6327HTSA1 application, or BCX70KE6327HTSA1 equivalent, key selection criteria include its SOT-23 package compatibility, AEC-Q101 qualification for automotive environments, guaranteed h_FE group K performance, and low-noise operation below 15 kHz - critical for microphone preamps and sensor interface stages.

Technical Context

This transistor operates as a linear amplifying device with DC current gain defined across three test conditions: h_FE ≥ 250 at I_C = 10 µA, ≥ 380 at I_C = 2 mA, and ≥ 460 at I_C = 50 mA (V_CE = 1 V). Its f_T = 250 MHz supports stable gain up to mid-VHF, while C_cb = 0.95 pF and C_eb = 9 pF limit Miller effect in common-emitter configurations.

Thermal design is constrained by R_thJS ≤ 240 K/W and P_tot = 330 mW at T_S ≤ 71 °C. The device meets AEC-Q101 stress testing requirements and features Pb-free (RoHS-compliant) construction in a standard SOT-23 plastic package with defined pinout B-E-C.

Key Specifications

Pinout & Package

BCX70KE6327HTSA1 is housed in a RoHS-compliant SOT-23 surface-mount plastic package with gull-wing leads and standardized mechanical dimensions (JEDEC TO-236AB). The package supports automated pick-and-place assembly and reflow soldering per IPC-J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC847BK,315 and MMBT3904LT1G, BCX70KE6327HTSA1 uniquely combines AEC-Q101 qualification, guaranteed low-noise performance (2 dB), and tight h_FE grouping - making it the only choice for automotive audio front-ends requiring both reliability and signal fidelity.

Availability

BCX70KE6327HTSA1 is available at Aetrix Electronics and suitable for automotive cabin microphone preamplifiers, industrial sensor signal conditioners, consumer audio line drivers, and automotive LED driver interfaces requiring stable component supply and long-term lifecycle support.

Supply support for BCX70KE6327HTSA1 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, with global manufacturing and quality certification infrastructure.

This transistor belongs to Infineon's BCX70 family of AEC-Q101-qualified general-purpose NPN transistors, engineered specifically for high-reliability analog signal conditioning in automotive and industrial environments where low noise and stable h_FE are critical.

FAQ

Is BCX70KE6327HTSA1 pin-compatible with BC847 series transistors?

Yes - BCX70KE6327HTSA1 uses the standard SOT-23 package with identical B-E-C pinout (pin 1 = emitter, pin 2 = base, pin 3 = collector), matching BC847, MMBT3904, and other common NPN SOT-23 transistors. No PCB redesign is required for drop-in replacement in most linear amplifier or switching layouts.

What is the maximum operating temperature for continuous DC operation?

The junction temperature must not exceed 150 °C, and total power dissipation is limited to 330 mW only when the soldering point temperature (T_S) remains ≤ 71 °C. At higher board temperatures, derating is required per the published P_tot vs. T_S curve, with zero dissipation at T_S = 150 °C.

Does this transistor support pulsed operation beyond its DC ratings?

Yes - the device permits short-duration pulses with peak power up to 5× DC rating (e.g., 1.65 W) for pulse widths ≤ 100 µs and duty cycle ≤ 2%, as defined in the permissible pulse load graph. This enables use in burst-mode sensor excitation or PWM-driven LED interfaces without thermal failure.

How does the h_FE group K specification affect circuit design?

Group K guarantees h_FE ≥ 250 at I_C = 10 µA and ≥ 380 at I_C = 2 mA, allowing designers to size base resistors with tighter tolerance and reduce sensitivity to process variation. This eliminates need for trim pots or feedback compensation in fixed-gain microphone preamp stages.