Infineon Technologies BC849CWH6327XTSA1

Overview

BC849CWH6327XTSA1 from Infineon Technologies is an NPN silicon bipolar junction transistor designed for audio-frequency input stages and driver applications. It features a DC current gain (h_FE) of 420–800 at I_C = 2 mA, V_CE = 5 V; V_CEO = 30 V; V_CE(sat) ≤ 250 mV at I_C = 10 mA, I_B = 0.5 mA; and low noise (F = 1.2–4 dB) in the 1 kHz band - enabling high-fidelity signal amplification in compact analog front-ends.

For engineers reviewing the BC849CWH6327XTSA1 datasheet, BC849CWH6327XTSA1 pinout, BC849CWH6327XTSA1 application, or BC849CWH6327XTSA1 equivalent, key selection criteria include its AEC-Q101 qualification, SOT-323 (SC-70) package, complementary PNP pairing with BC859C, and suitability for low-voltage, low-noise linear amplification where thermal resistance (R_thJS ≤ 105 K/W) and RoHS compliance are mandatory.

Technical Context

This transistor operates as a general-purpose NPN amplifier with fixed-emitter biasing capability in discrete analog signal chains. Its h_FE grouping (C-grade) ensures tight current gain distribution across production lots, while f_T = 250 MHz supports stable operation up to mid-VHF frequencies under small-signal conditions.

The device exhibits low V_CE(sat) and V_BE(sat), enabling efficient switching and linear amplification in battery-powered audio preamps and sensor interface circuits. Its C_cb = 0.95 pF and C_eb = 9 pF values support predictable frequency response shaping without requiring external neutralization.

Key Specifications

Pinout & Package

BC849CWH6327XTSA1 is housed in a SOT-323 (SC-70) plastic surface-mount package, measuring 2.1 mm × 1.25 mm × 0.95 mm, optimized for high-density PCB layouts and automated reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC849CTA and MMBT3904LT1G, BC849CWH6327XTSA1 delivers superior thermal performance in miniaturized layouts, tighter h_FE consistency for precision biasing, and validated automotive reliability - making it optimal for space- and noise-critical analog signal paths.

Availability

BC849CWH6327XTSA1 is available at Aetrix Electronics and suitable for audio preamplifiers, automotive sensor interfaces, and low-voltage switch drivers requiring stable component supply, consistent parametric binning, and long-term manufacturing continuity.

Supply support for BC849CWH6327XTSA1 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.

BC849CWH6327XTSA1 belongs to Infineon's BC846–BC850 family of general-purpose RF/audio transistors - engineered for high-reliability analog signal conditioning in automotive, industrial, and consumer equipment where low noise, AEC-Q101 compliance, and SMT scalability are essential.

FAQ

Is BC849CWH6327XTSA1 pin-compatible with BC847C or BC848C?

No - BC849CWH6327XTSA1 uses SOT-323 (SC-70) packaging with E-B-C pin order, whereas BC847C/BC848C in SOT-23 share identical pinout but differ in thermal resistance (240 K/W vs. 105 K/W) and maximum V_CEO (45 V vs. 30 V). Physical replacement requires PCB redesign and thermal derating verification.

What is the maximum continuous collector current for BC849CWH6327XTSA1 at 85 °C ambient?

At T_A = 85 °C, the maximum continuous collector current is 65 mA, derived from P_tot = 250 mW and V_CE(sat) ≤ 250 mV, assuming worst-case thermal path (R_thJA ≈ 300 K/W on 2-layer FR4). Derating curves in Infineon's Application Note AN2010-06-28 confirm this limit.

Does BC849CWH6327XTSA1 support linear operation at 100 kHz with 10 mVpp input?

Yes - with h_FE ≥ 420 and f_T = 250 MHz, the device maintains linear gain (h_21e ≥ 480) and low distortion (<0.5% THD) at 100 kHz under I_C = 1–5 mA bias, verified by Infineon's AC characterization data in Section 5 of the BC846–BC850 datasheet.

Can BC849CWH6327XTSA1 replace BC849CW in existing designs?

Yes - BC849CWH6327XTSA1 and BC849CW share identical electrical specifications, SOT-323 package, and marking ('2Cs'), differing only in tape-and-reel packaging (H6327 vs. standard reel) and traceability coding (XTSA1 denotes Infineon's standardized lot trace format). No circuit or layout changes are required.