Nexperia USA Inc. BC849C,235

Overview

BC849C from Nexperia is an AEC-Q101 qualified NPN general-purpose transistor in SOT23 package, rated for 30 V V_CEO, 100 mA I_C, and DC current gain (h_FE) of 450 at 10 µA I_C. It serves as a low-voltage switching and amplification device in automotive body electronics, sensor interface stages, and LED driver bias circuits.

For engineers reviewing the BC849C datasheet, BC849C pinout, BC849C application, or BC849C equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C junction temperature rating, SOT23 thermal resistance of 500 K/W on FR4 PCB, and verified h_FE stability across −55 °C to +150 °C.

Technical Context

This discrete NPN bipolar junction transistor operates in linear or saturated switching modes with V_CE(sat) ≤ 600 mV at I_C = 100 mA / I_B = 5 mA and V_BE(sat) ≤ 900 mV under same conditions. Its f_T of 100 MHz supports medium-frequency amplification up to audio band.

Thermal performance is defined for FR4 PCB mounting (single-sided copper, tin-plated), with R_th(j-a) = 500 K/W and transient Z_th(j-a) validated per IEC 60134. Cut-off currents are tightly specified: I_CBO ≤ 5 µA at 150 °C and I_EBO ≤ 100 nA at 25 °C.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body; optimized for reflow and wave soldering per Nexperia footprints sot023_fr and sot023_fw.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC849B and BC859C, BC849C provides the highest guaranteed h_FE among SOT23 NPN variants in this family, enabling smaller base drive components and tighter tolerance in current-source designs-critical for precision sensor interfaces and automotive diagnostics.

Availability

BC849C is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and LED driver bias circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BC849C 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.

BC849C belongs to Nexperia's AEC-Q101 qualified general-purpose transistor product line, engineered specifically for robust operation in automotive interior electronics and industrial control environments where thermal resilience and parametric consistency are critical.

FAQ

Is BC849C suitable for automotive under-hood applications?

Yes, BC849C is AEC-Q101 qualified and rated for T_j = 150 °C, making it suitable for under-hood applications such as engine bay sensors and lighting control modules. Its limiting values-including V_CEO = 30 V and I_C = 100 mA-are validated per IEC 60134 stress testing protocols, and thermal resistance data assumes FR4 PCB mounting typical in automotive ECUs.

What is the maximum allowable base current for continuous operation?

The absolute maximum peak base current (I_BM) is 200 mA, but for continuous DC operation, base current must be sized to maintain I_C ≤ 100 mA while ensuring V_CE(sat) remains within spec. At I_C = 100 mA and h_FE ≥ 90, I_B ≥ 1.1 mA is required; practical design uses 2–5 mA to guarantee saturation across temperature and process variation.

Does BC849C have a built-in ESD protection diode?

No, BC849C does not integrate ESD protection diodes. Its ESD rating is specified per HBM (Human Body Model) per AEC-Q101 test plan, but external protection-such as series resistors or TVS diodes-is required in systems exposed to >2 kV contact discharge, especially in connector-facing positions like door module switch inputs.

Can BC849C replace BC847C in existing designs?

BC849C can replace BC847C only if the application requires higher h_FE (420–800 vs. 110–800) and operates within identical V_CEO (30 V) and I_C (100 mA) limits. However, BC847C has lower V_CE(sat) (max 600 mV vs. 200–600 mV for BC849C), so substitution may increase conduction loss in high-duty-cycle switching. Verify thermal rise and gain stability in final layout.