Overview
The Siemens BC850B E-6327 is a production roll containing 1000 individually packaged NPN silicon transistors. The BC850B is a low-noise variant of the industry-standard BC850 series, widely used in audio input stages, driver circuits, and general-purpose switching applications. This product offers the reliability and traceability required for manufacturing and repair operations.
Key Features
- Low noise performance: Typical 1.2–4.0 dB noise figure between 30 Hz and 15 kHz
- High current gain (hFE): 200–450 (B variant) ensures efficient amplification
- Surface mount SOT-23 package: Compatible with automated assembly and hand-rework
- Roll of 1000 units: Cost-effective supply for production and inventory
- NXP/Siemens pedigree: Genuine semiconductors with full electrical specifications
Technical Specifications
- Device Type: NPN Silicon BJT (Bipolar Junction Transistor)
- Package: SMD SOT-23 (3-pin)
- Collector-Emitter Voltage (VCE): 45 V max
- Collector-Base Voltage (VCB): 50 V max
- Collector Current (IC): 100 mA max
- Power Dissipation (PC): 0.2 W max
- Transition Frequency (fT): 150 MHz
- Forward Current Transfer Ratio (hFE): 200–450 (at VCE = 5 V, IC = 100 µA)
- Noise Figure: 1.2 dB typ., 4.0 dB max (f = 1 kHz, VCE = 5 V)
- Operating Junction Temperature: −55 to +150 °C
- Quantity: 1000 units per roll
Typical Applications
- Audio preamplifiers and low-noise input stages: The low noise rating makes BC850B ideal for audio equipment requiring high signal quality
- Driver and buffer stages: High current gain enables efficient signal amplification in multi-stage designs
- General switching circuits: Fast switching speed suitable for logic-level triggering and relay driver applications
- Industrial control and instrumentation: Reliable operation across wide temperature range for harsh environments
- Consumer and commercial electronics repair/refurbishment: Drop-in replacement for original BC850B components
Compatibility & Replacements
The BC850B is fully compatible with other BC850 variants (BC850A, BC850C) and functionally equivalent to Infineon and NXP versions of the same part number. The complementary PNP type is the BC860. Common substitutes in the NPN general-purpose series include BC846, BC847, BC848, and BC849, though the BC850B’s superior noise performance makes it preferred for sensitive audio and measurement circuits. Pin configuration is standard: Base (1), Emitter (2), Collector (3) on SOT-23 package.
