Infineon Technologies BC 846B E6327

Overview

BC846B E6327 from Infineon Technologies is an NPN silicon general-purpose bipolar junction transistor (BJT) designed for audio-frequency input stages and driver applications. It delivers high DC current gain (h_FE = 200–450 at I_C = 2 mA), low collector-emitter saturation voltage (V_CE(sat) ≤ 250 mV at I_C = 10 mA / I_B = 0.5 mA), and low noise (F = 1.2–4 dB at 1 kHz). It is qualified to AEC-Q101 and housed in a RoHS-compliant SOT23 package.

For engineers reviewing the BC846B E6327 datasheet, BC846B E6327 pinout, BC846B E6327 application, or BC846B E6327 equivalent, key selection criteria include its V_CEO = 65 V rating, thermal resistance R_thJS ≤ 240 K/W, f_T = 250 MHz transition frequency, and suitability for linear amplification and switching in space-constrained automotive and industrial signal chains.

Technical Context

The BC846B E6327 operates as a discrete NPN BJT with fixed emitter-base and collector-base junctions optimized for analog signal amplification and low-power switching. Its h_FE grouping (B-grade) ensures consistent current amplification across production lots, while its low V_BE(sat) (700–900 mV) and V_CE(sat) support efficient biasing in Class-A and emitter-follower configurations.

Designed for operation up to T_j = 150 °C, it features a maximum P_tot of 330 mW at T_S ≤ 71 °C and exhibits stable noise performance (F ≤ 4 dB) between 30 Hz and 15 kHz-making it suitable for preamplifier stages where SNR preservation is critical.

Key Specifications

Pinout & Package

BC846B E6327 is supplied in the standard SOT23 surface-mount plastic package (JEDEC TO-236AB), measuring 2.9 × 1.3 × 1.0 mm, with gull-wing leads for reflow compatibility and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC846B E6327, BC847B E6327 trades off voltage headroom for slightly higher power dissipation margin (P_tot = 330 mW vs. 310 mW), while MMBT3904LT1G offers broader global availability but requires circuit-level validation due to lower h_FE and higher saturation voltage.

Availability

BC846B E6327 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and consumer audio signal conditioning requiring stable component supply and long-term lifecycle assurance.

Supply support for BC846B E6327 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.

The BC846B E6327 belongs to Infineon's BC846–BC850 family of AEC-Q101-qualified general-purpose transistors, engineered for reliability-critical analog signal paths in automotive and industrial environments.

FAQ

Is BC846B E6327 suitable for linear amplifier applications?

Yes. With its low noise figure (1.2–4 dB), high h_FE consistency, and stable V_BE(ON) (580–770 mV), the BC846B E6327 is explicitly rated for AF input stages. Its f_T of 250 MHz supports bandwidths beyond audio into low-RF ranges, and its low V_CE(sat) helps maintain linearity in Class-A bias configurations.

What is the maximum junction temperature and how does it affect derating?

The absolute maximum junction temperature is 150 °C. At case temperatures above 71 °C, total power dissipation must be linearly derated from 330 mW using R_thJS ≤ 240 K/W. For example, at T_S = 100 °C, P_tot must not exceed 235 mW to prevent exceeding T_j = 150 °C.

Does BC846B E6327 have complementary PNP variants?

Yes. Infineon specifies BC856B–BC860B as the complementary PNP counterparts, sharing identical SOT23 packaging, AEC-Q101 qualification, and matched electrical characteristics (e.g., V_CEO = 65 V for BC856B). This pairing enables balanced push-pull output stages and differential amplifiers.

Can BC846B E6327 replace BC846A or BC846C in existing designs?

Yes, with verification. The BC846B differs from A and C grades solely in h_FE range: A = 110–220, B = 200–450, C = 420–800. If the original design relies on minimum h_FE ≥ 200, BC846B is a safe drop-in replacement; however, circuits dependent on upper h_FE limits may require bias network adjustment.