BC847BN3T5G

Updated: 2026-09-17

Overview

The BC847BN3T5G is a general-purpose NPN bipolar junction transistor (BJT) manufactured in a compact SOT-23 surface-mount package. It is part of the BC847 series, renowned for its consistent performance in low-power amplification and switching circuits. Designed for broad compatibility, it is a staple in consumer electronics, automotive modules, and industrial control systems. With a maximum collector current of 100 mA and a voltage rating of 45 V, this transistor balances efficiency and durability. Its small form factor makes it ideal for space-constrained PCB designs, while its RoHS compliance ensures adherence to environmental standards.

Structure and Working Principle

The BC847BN3T5G operates as a current-controlled device, where a small base current regulates a larger collector-emitter current. Its three-layer semiconductor structure (emitter, base, collector) enables amplification or switching when biased correctly. The SOT-23 package includes three pins: emitter, base, and collector, with standardized pinouts for ease of integration. Key internal features include a thin base region for high current gain (hFE typically 200–600) and low saturation voltage, ensuring energy efficiency. The transistor's performance is stable across a temperature range of -55°C to +150°C, suitable for harsh environments.

Key Features

The BC847BN3T5G offers a high current gain (hFE) range, minimizing the drive power needed for amplification. Its low saturation voltage (VCE(sat) ≈ 0.6 V at 100 mA) reduces power loss in switching applications. The SOT-23 package provides mechanical durability and thermal resistance, supporting automated PCB assembly processes. Additional features include Pb-free construction and moisture sensitivity level (MSL) 1 certification, ensuring compatibility with lead-free soldering and long-term storage. These attributes make it a versatile choice for prototyping and mass production alike.

Application Areas

This transistor is widely used in audio amplifiers, signal processing circuits, and digital logic interfaces. In consumer electronics, it drives LEDs, relays, and sensors. Automotive applications include ECU modules and lighting systems, where reliability is critical. Industrial uses encompass motor drivers, power management, and automation controls. Its low noise and stable gain also suit RF stages in communication devices. Designers favor the BC847BN3T5G for its balance of cost, performance, and ease of integration.

Maintenance and Precautions

To ensure longevity, avoid exceeding the absolute maximum ratings (e.g., 45 V collector-emitter voltage, 200 mA peak current). Proper heat dissipation is essential in high-current applications; PCB layout should minimize thermal resistance. Static electricity can damage the transistor—use ESD-safe handling procedures during assembly. Storage should be in dry, anti-static packaging to prevent moisture absorption. For failure analysis, check for solder joint integrity and signs of thermal stress.

B2B Procurement Guide

Bulk purchasers should verify datasheet parameters (e.g., hFE grading) match their project requirements. Authorized distributors like ON Semiconductor, Nexperia, or reputable franchised partners ensure genuine components. MOQs typically start at 3,000 units, with prices dropping for larger orders. Lead times vary by supplier; consider inventory buffers for high-demand periods. Certifications (ISO, AEC-Q101 for automotive) may be required for specific industries. Sample testing is recommended to validate lot consistency before large-scale procurement.