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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Nexperia USA Inc. BC850CW,115

Name: BC850CW,115
Brand: Nexperia USA Inc.
SKU: BC850CW,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC850CW,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BC850CW,115.pdf

Description:: TRANS NPN 45V 0.1A SOT-323

Quantity:: RFQ Add To RFQ list

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Inventory:5,424

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Product details

Overview

BC850CW,115 from Nexperia is an NPN general-purpose bipolar junction transistor in SOT323 package, rated for 45 V V_CEO, 100 mA I_C, and featuring h_FE of 420–800 at 2 mA/5 V. It serves as a low-noise amplifying or switching element in audio-frequency signal paths, particularly in compact consumer audio equipment.

For engineers reviewing the BC850CW,115 datasheet, BC850CW,115 pinout, BC850CW,115 application, or BC850CW,115 equivalent, key selection criteria include DC current gain consistency across production lots, low V_CE(sat) at 10 mA/0.5 mA drive, noise figure ≤4 dB in 10 Hz–15.7 kHz band, and thermal resistance of 625 K/W on FR4 PCB.

Technical Context

This transistor operates in linear or active-switching mode with guaranteed h_FE spread (420–800) under standard bias (I_C = 2 mA, V_CE = 5 V), enabling predictable small-signal amplification. Its f_T of 100 MHz supports stable operation up to mid-VHF frequencies without parasitic oscillation.

Designed for low-noise analog stages, it delivers F ≤ 4 dB at 200 μA collector current with 2 kΩ source impedance and narrow bandwidth (200 Hz), while maintaining C_c ≤ 3 pF and C_e ≈ 11 pF - critical for high-fidelity audio coupling and feedback stability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C (DC)	100 mA - continuous collector current limit defining usable output drive capability
h_FE	420–800 - DC current gain range at 2 mA/5 V, enabling precise bias network design
V_CE(sat)	≤250 mV at I_C=10 mA/I_B=0.5 mA - low saturation voltage ensures minimal power loss in switching applications
f_T	100 MHz - transition frequency confirming usable bandwidth for audio and low-speed digital signal conditioning
F (Noise Figure)	≤4 dB at 200 μA, 2 kΩ, 1 kHz - quantifies low-noise performance essential for preamplifier input stages
R_{th j-a}	625 K/W - thermal resistance on FR4 board, informing derating requirements above 25 °C ambient

Pinout & Package

SOT323 plastic surface-mounted package (2.2 × 1.35 × 0.95 mm), 3-lead, JEDEC SC-70 compliant, optimized for space-constrained audio PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal accepting base current to modulate collector-emitter conduction; requires current-limiting resistor in most bias networks
2	Emiter	Current sink node in common-emitter configuration; connected to ground or low-impedance reference in audio amplifier stages
3	Collector	Output current source node; interfaces with load resistor or next-stage input in amplification chains

Key Features

Feature	Design Value
Low-noise operation	F ≤ 4 dB at 1 kHz with 2 kΩ source, enabling use in microphone preamp and tape head amplification
High h_FE grade	420–800 gain range reduces base drive requirements and improves bias stability in discrete amplifier designs
Low V_CE(sat)	≤250 mV at 10 mA ensures <2.5 mW dissipation in saturated switching, minimizing heat in compact enclosures
Small-outline packaging	SOT323 footprint (2.2 × 1.35 mm) allows dense placement in portable audio devices without thermal crowding

Applications

Tape Recorder Preamp Stage

Hi-Fi Audio Input Buffer

Use Scenario: Amplifying weak signals from magnetic tape playback heads prior to equalization and further processing.

IC Role / Device Role / Timing Role: NPN transconductance amplifier operating in common-emitter configuration with emitter degeneration.

Use Value: 4 dB noise figure and 420–800 h_FE enable high SNR amplification of microvolt-level signals without added distortion.

Use Scenario: Isolating and buffering line-level analog inputs in stereo receivers and integrated amplifiers.

IC Role / Device Role / Timing Role: Unity-gain emitter-follower buffer providing low-output-impedance drive to tone control networks.

Use Value: Low V_CE(sat) and tight h_FE tolerance ensure consistent DC bias and minimal signal attenuation across production units.

Portable Audio Signal Switching

Compact Equipment Bias Network

Use Scenario: Selecting between multiple audio sources using discrete transistor switches in battery-powered mixers.

IC Role / Device Role / Timing Role: Low-power saturated switch controlling signal path continuity via base-current activation.

Use Value: 250 mV V_CE(sat) at 10 mA limits insertion loss to <0.25% of peak signal swing, preserving dynamic range.

Use Scenario: Establishing stable quiescent operating points in Class-A headphone amplifier output stages.

IC Role / Device Role / Timing Role: Active current source/sink element in bias generation circuitry for complementary output pairs.

Use Value: 625 K/W thermal resistance and 150 °C T_j rating allow reliable operation within thermally constrained handheld enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC849CW,115	Lower h_FE (200–450) and 30 V V_CEO; otherwise identical SOT323 package and pinout	Less suitable for low-drive preamp designs requiring high gain; preferred where lower voltage stress exists	Select when V_CE remains below 30 V and gain margin >200 suffices
MMBT3904LT1G	Same h_FE range (100–300 typical, but wider distribution); 40 V V_CEO; SOT-23 package (larger footprint)	Higher noise figure (~5 dB) and less consistent gain make it less optimal for critical low-noise audio stages	Choose only if SOT-23 compatibility or alternate supply chain is required

Compared with BC849CW,115 and MMBT3904LT1G, BC850CW,115 offers superior noise performance and tighter h_FE spread - critical for production-stable audio front-ends - while maintaining identical mounting and layout compatibility within SOT323 constraints.

Availability

BC850CW,115 is available at Aetrix Electronics and suitable for tape recorder preamplifiers, hi-fi audio input buffers, and portable audio signal switching requiring stable component supply and consistent low-noise transistor performance.

Supply support for BC850CW,115 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 leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, and consumer markets.

BC850CW,115 belongs to Nexperia's general-purpose bipolar transistor product line, engineered specifically for cost-sensitive, space-constrained audio-frequency amplification and switching applications demanding repeatable gain and low intrinsic noise.

FAQ

What is the maximum operating temperature for BC850CW,115?

The BC850CW,115 has a maximum junction temperature (T_j) of 150 °C and an operating ambient temperature range of −65 °C to +150 °C. Thermal derating begins above 25 °C ambient due to its 625 K/W junction-to-ambient thermal resistance on FR4 PCB, requiring power reduction per the datasheet's derating curve.

Is BC850CW,115 pin-compatible with BC849CW,115?

Yes - both share identical SOT323 package, pin 1 (base), pin 2 (emitter), pin 3 (collector) assignment, and mechanical dimensions. The only functional differences are higher V_CEO (45 V vs. 30 V) and extended h_FE range (420–800 vs. 200–450), making BC850CW,115 a direct upgrade where voltage or gain headroom is needed.

Does BC850CW,115 require external ESD protection in audio circuits?

No - BC850CW,115 has no built-in ESD protection diodes, but its absolute maximum ratings include ±5 V V_EB and its typical application environments (low-voltage, board-level audio) rarely expose it to hazardous ESD events. External protection is recommended only in handling or connector-facing positions per IEC 61000-4-2 Level 2+ requirements.

Can BC850CW,115 be used in switching power supply feedback loops?

It is not recommended - while BC850CW,115 supports 100 MHz f_T, its lack of specified switching time parameters (t_on/t_off), relatively high C_c (3 pF), and absence of avalanche-rated V_CEO make it unsuitable for primary-side switching or fast optocoupler-driven feedback paths. Use dedicated switching transistors like PUMD3 or BCP56 for such roles.

BC850CW,115 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 420 @ 2mA, 5V

Power - Max:: 200 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BC850CW,115 FAQ

1.How can I place an order for BC850CW,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC850CW,115 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BC850CW,115 reliable?

The price and inventory of BC850CW,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC850CW,115 is usually 5 days.

3.What payment methods are accepted for BC850CW,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC850CW,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC850CW,115?

BC850CW,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC850CW,115 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BC850CW,115?

For technical support, including BC850CW,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC850CW,115 requirements.

6.How does Aetrix verify that BC850CW,115 is sourced from the original manufacturer or authorized distributors?

All BC850CW,115 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BC850CW,115 meets industry standards.

7.What is the process for return or replacement of BC850CW,115?

All BC850CW,115 units undergo pre-shipment inspection (PSI). If there is an issue with BC850CW,115, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BC850CW,115 part is unused and in its original packaging.

Return procedure for BC850CW,115:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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