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

Nexperia USA Inc. BC849BW,115

Name: BC849BW,115
Brand: Nexperia USA Inc.
SKU: BC849BW,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC849BW,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BC849BW,115.pdf

Description:: TRANS NPN 30V 0.1A SOT-323

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC849BW,115 from Nexperia is an NPN general-purpose bipolar junction transistor in SOT323 package, rated for 30 V V_CBO, 30 V V_CEO, and 100 mA I_C, with DC current gain (h_FE) of 200–450 at I_C = 2 mA / V_CE = 5 V. It serves as a low-noise amplifying or switching element in audio-frequency signal paths.

For engineers reviewing the BC849BW,115 datasheet, BC849BW,115 pinout, BC849BW,115 application, or BC849BW,115 equivalent, this device is selected for low-voltage, low-current analog amplification stages where gain consistency, noise performance, and thermal stability on FR4 PCBs are critical design factors.

Technical Context

This transistor operates in linear active mode for small-signal amplification and in saturation/cutoff for digital switching. Its f_T of 100 MHz supports audio-band fidelity with minimal phase distortion, while C_c = 3 pF and C_e = 11 pF define high-frequency impedance behavior under bias.

The device exhibits low V_CEsat (≤250 mV at I_C = 10 mA / I_B = 0.5 mA) and tight V_BE distribution (580–700 mV), enabling predictable biasing in discrete amplifier topologies without emitter degeneration resistors.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	30 V - maximum reverse collector-base voltage before breakdown; sets safe operating range in common-emitter configurations
V_CEO	30 V - maximum collector-emitter voltage with base open; defines upper rail limit for single-supply amplifiers
I_C (DC)	100 mA - continuous collector current capacity; supports line-level audio driver stages up to ~100 mW into 32 Ω
h_FE	200–450 - DC current gain at 2 mA/5 V; enables stable bias point selection with ±25% tolerance across production lots
f_T	100 MHz - transition frequency; ensures flat gain response through 20 kHz with margin for harmonic content
V_CEsat	≤250 mV @ I_C=10 mA/I_B=0.5 mA - low saturation voltage minimizes power loss and heating in switching applications
F (noise figure)	4 dB @ 200 μA/5 V/2 kΩ/R_S - quantifies low-noise capability for preamplifier input stages in hi-fi systems

Pinout & Package

SOT323 (SC-70) surface-mount plastic package: 1.35 mm × 1.75 mm footprint, 0.95 mm height, FR4-compatible thermal resistance R_{th j-a} = 625 K/W.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Current-controlled input node; requires 0.5–1 mA drive for full 100 mA collector conduction
2	Emitter	Reference terminal for bias network; connects to ground or emitter resistor in common-emitter configuration
3	Collector	Output current sink; routes amplified signal or switched load current to V_CC via pull-up resistor or transformer

Key Features

Feature	Design Value
Low-noise amplification	4 dB noise figure at audio frequencies enables use in microphone preamp inputs without added op-amp stage
Stable h_FE range	200–450 gain spread allows fixed-bias designs with ≤10% quiescent current variation across temperature
FR4-optimized thermal performance	625 K/W junction-to-ambient resistance permits 200 mW dissipation at ≤25 °C ambient without heatsinking
Low V_CEsat	≤250 mV at 10 mA enables efficient switching in LED drivers or logic-level translators with <10 mW loss

Applications

Audio Preamplifier Stage

Tape Recorder Input Amplifier

Use Scenario: First-stage amplification of dynamic microphone signals (1–5 mV RMS) before op-amp buffering.

IC Role / Device Role / Timing Role: NPN small-signal amplifier configured in common-emitter topology with emitter degeneration.

Use Value: 4 dB noise figure preserves SNR; h_FE ≥200 ensures ≥20 dB voltage gain with 10 kΩ collector load and 1 kΩ emitter resistor.

Use Scenario: Input buffer for magnetic tape playback head with 1–2 kΩ source impedance.

IC Role / Device Role / Timing Role: Low-distortion linear amplifier with DC-coupled feedback network.

Use Value: C_c = 3 pF and C_e = 11 pF minimize high-frequency peaking; f_T = 100 MHz ensures flat 30 Hz–15 kHz response.

Hi-Fi Tone Control Driver

Low-Power Logic Interface

Use Scenario: Driving passive Baxandall tone stack (capacitive + resistive load) in analog equalizers.

IC Role / Device Role / Timing Role: Voltage follower or emitter-follower buffer with unity gain and low output impedance.

Use Value: V_CEsat ≤250 mV and h_FE ≥200 enable <1 Ω effective output impedance into 10 kΩ tone network, minimizing frequency-dependent loading.

Use Scenario: Level-shifting TTL/CMOS outputs to drive 5 V relay coils or optocouplers.

IC Role / Device Role / Timing Role: Digital switch in common-emitter configuration with base resistor control.

Use Value: 100 mA I_C rating supports 20–50 mA relay loads; ≤250 mV V_CEsat limits coil power loss to <12.5 mW at 50 mA.

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
BC847BW,115	V_CBO/V_CEO = 50 V/45 V; h_FE = 110–220 - lower gain, higher voltage rating	Better suited for 5–12 V supply rails with higher headroom; less ideal for low-noise mic preamps	Select when voltage margin >30 V is required and gain tolerance >±50% is acceptable
MMBT3904LT1G	V_CBO/V_CEO = 60 V/40 V; h_FE = 100–300; f_T = 300 MHz - wider gain spread, higher f_T, same SOT-23 package	Higher f_T supports RF coupling but adds instability risk in audio layouts without layout control	Select when board space allows SOT-23 and design tolerates 100–300 h_FE variation

Compared with BC849BW,115, BC847BW,115 trades gain for voltage headroom, while MMBT3904LT1G offers higher speed at the cost of tighter layout control and reduced low-noise consistency-making BC849BW,115 optimal for precision audio front-ends where gain stability and noise floor dominate.

Availability

BC849BW,115 is available at Aetrix Electronics and suitable for audio preamplifier stages, tape recorder input circuits, hi-fi tone control drivers, and low-power logic interface applications requiring stable component supply and consistent h_FE binning.

Supply support for BC849BW,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 semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in automotive, industrial, computing, and consumer-grade components.

The BC849BW,115 belongs to Nexperia's BC84xW series of general-purpose NPN transistors designed specifically for low-noise, low-voltage audio-frequency amplification and switching in space-constrained surface-mount applications.

FAQ

What is the maximum operating temperature for BC849BW,115?

The BC849BW,115 has a maximum junction temperature (T_j) of 150 °C and an operating ambient temperature range of −65 °C to +150 °C. Its thermal resistance R_{th j-a} is 625 K/W when mounted on FR4 PCB, meaning it dissipates 200 mW at 25 °C ambient before reaching T_j = 150 °C. Derating is required above 25 °C per the datasheet's linear curve.

Is BC849BW,115 pin-compatible with BC847BW,115?

Yes - both devices use the SOT323 package with identical pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. Mechanical dimensions, solder pad layout, and thermal profile are fully interchangeable. However, electrical parameters differ: BC849BW,115 offers higher h_FE (200–450 vs. 110–220) and lower V_CBO/V_CEO (30 V vs. 50 V/45 V), so functional substitution requires circuit validation.

What is the typical noise figure and at what conditions is it measured?

The BC849BW,115 has a typical noise figure of 4 dB, measured at I_C = 200 μA, V_CE = 5 V, R_S = 2 kΩ, over 10 Hz–15.7 kHz bandwidth. An identical 4 dB value is specified at 1 kHz with 200 Hz bandwidth. This low noise performance is achieved due to optimized epitaxial base doping and narrow base width, making it suitable for sensitive audio input stages.

Does BC849BW,115 have a PNP complement in the same package?

Yes - the PNP complement is BC859BW, also in SOT323 package. It shares matching voltage ratings (V_CBO = −30 V, V_CEO = −30 V), current capability (I_C = −100 mA), and gain range (h_FE = 200–450), enabling complementary pair use in Class AB output stages or differential amplifiers without footprint redesign.

BC849BW,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):: 30 V

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

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 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

BC849BW,115 FAQ

1.How can I place an order for BC849BW,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC849BW,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 BC849BW,115 reliable?

The price and inventory of BC849BW,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC849BW,115 is usually 5 days.

3.What payment methods are accepted for BC849BW,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC849BW,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC849BW,115?

BC849BW,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC849BW,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 BC849BW,115?

For technical support, including BC849BW,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC849BW,115 requirements.

6.How does Aetrix verify that BC849BW,115 is sourced from the original manufacturer or authorized distributors?

All BC849BW,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 BC849BW,115 meets industry standards.

7.What is the process for return or replacement of BC849BW,115?

All BC849BW,115 units undergo pre-shipment inspection (PSI). If there is an issue with BC849BW,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 BC849BW,115 part is unused and in its original packaging.

Return procedure for BC849BW,115:

1.Submit a request within 90 days.

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

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