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

Nexperia USA Inc. BC859BW,115

Name: BC859BW,115
Brand: Nexperia USA Inc.
SKU: BC859BW,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC859BW,115

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: BC859BW,115.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:3,566

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Product details

Overview

BC859BW,115 from Nexperia is a PNP 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 220–475 at −2 mA I_C. It serves as an amplifying or switching element in low-noise audio-frequency stages of tape recorders and hi-fi amplifiers.

For engineers reviewing the BC859BW,115 datasheet, BC859BW,115 pinout, BC859BW,115 application, or BC859BW,115 equivalent, key selection considerations include its PNP polarity, SOT323 footprint compatibility, guaranteed h_FE range, low-noise figure (4 dB), and thermal resistance (625 K/W) on FR4 PCB.

Technical Context

This transistor operates in linear or saturation mode with base-emitter turn-on voltage of 600–750 mV at −2 mA I_C, and exhibits collector-emitter saturation voltage ≤ −300 mV at −10 mA I_C/−0.5 mA I_B. Its transition frequency f_T is 100 MHz, supporting audio and low-speed switching applications.

Thermal performance is defined by R_{th j-a} = 625 K/W on FR4 board; maximum junction temperature is 150 °C. Noise figure remains stable at 4 dB across 10 Hz–15.7 kHz bandwidth with 2 kΩ source resistance, confirming suitability for low-noise preamplifier design.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	−30 V - Maximum reverse voltage between collector and base with emitter open; defines safe blocking capability in PNP configuration.
h_FE	220–475 - DC current gain range at −2 mA I_C, −5 V V_CE; ensures predictable biasing in amplifier designs.
V_CE(sat)	≤ −300 mV - Collector-emitter saturation voltage at −10 mA I_C/−0.5 mA I_B; enables low-loss switching in signal routing.
f_T	100 MHz - Transition frequency at −10 mA I_C, −5 V V_CE; supports stable gain up to audio band and beyond.
F_noise	4 dB - Noise figure at −200 μA I_C, 2 kΩ R_S, 10 Hz–15.7 kHz; meets low-noise requirements in preamp input stages.
R_{th j-a}	625 K/W - Thermal resistance from junction to ambient on FR4 board; informs derating needs for continuous operation.

Pinout & Package

Package: SOT323 (SC-70), surface-mount plastic package with 3 leads; dimensions per JEDEC MO-203AA, 2.2 mm × 1.35 mm × 0.95 mm max height.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-biased PNP operation; requires negative bias relative to emitter to enable conduction.
2	Emitter	Current source terminal in PNP configuration; typically connected to higher potential (e.g., V_CC) in common-emitter amplifier.
3	Collector	Current sink terminal; output node where amplified or switched current flows toward lower potential (e.g., ground or load).

Key Features

Feature	Design Value
Low-noise performance	4 dB noise figure at audio frequencies enables use in sensitive preamplifier inputs without added noise degradation.
Guaranteed h_FE range	220–475 at −2 mA ensures consistent small-signal gain across production lots, reducing need for manual gain binning.
SOT323 footprint	Standardized 3-pin SC-70 package allows drop-in replacement in space-constrained PCB layouts with established reflow profiles.
High f_T	100 MHz transition frequency supports stable amplification up to mid-audio band and fast switching in timing circuits.

Applications

Audio Preamp Stage

Tape Recorder Signal Path

Use Scenario: Low-level signal amplification before analog-to-digital conversion in portable audio recorders.

IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with emitter degeneration for linearity.

Use Value: 4 dB noise figure preserves signal integrity at microvolt-level inputs; h_FE consistency simplifies bias network design.

Use Scenario: Input buffer and gain stage in analog cassette playback circuitry.

IC Role / Device Role / Timing Role: Linear amplifying transistor handling 20 Hz–20 kHz signals with minimal harmonic distortion.

Use Value: Stable h_FE across temperature ensures consistent gain over operating range; low V_CE(sat) minimizes power loss in battery-powered units.

Hi-Fi Amplifier Input

Low-Speed Switching Node

Use Scenario: First-stage amplification in phono preamplifiers requiring high input impedance and low noise.

IC Role / Device Role / Timing Role: PNP differential pair component in discrete op-amp front-end topology.

Use Value: Matched h_FE range (220–475) supports balanced biasing; low C_c (5 pF) maintains wide bandwidth without compensation.

Use Scenario: On/off control of LED indicators or relay drivers in industrial control panels.

IC Role / Device Role / Timing Role: Saturated switch with base drive optimized for < −0.5 mA to ensure full turn-on.

Use Value: V_CE(sat) ≤ −300 mV at −10 mA reduces heat generation; 200 mW P_tot rating supports continuous duty cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC857BW,115	V_CBO = −50 V, V_CEO = −45 V, h_FE = 220–475 - higher voltage rating but identical gain range and package.	Preferred in higher-voltage audio rails (>30 V) or industrial signal conditioning where transient margin is critical.	Select when system V_CC exceeds 30 V or transient suppression headroom is required beyond −30 V.
BC859B,115	SOT23 package (larger footprint), same electrical specs - different mechanical form factor and thermal resistance (R_{th j-a} = 300 K/W).	Used where board layout allows larger SOT23 or where improved thermal dissipation is needed at higher ambient temperatures.	Choose when thermal management priority outweighs space constraints, or legacy SOT23 footprints must be maintained.

Compared with BC859BW,115, BC857BW,115 offers enhanced voltage safety margin without gain trade-off, while BC859B,115 trades miniaturization for better thermal performance-enabling selection based on voltage headroom or thermal budget rather than functional equivalence alone.

Availability

BC859BW,115 is available at Aetrix Electronics and suitable for audio preamplifiers, tape recorder signal paths, and hi-fi amplifier input stages requiring stable component supply, consistent h_FE binning, and low-noise transistor performance.

Supply support for BC859BW,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.

The BC859BW,115 belongs to Nexperia's BC85xW series of general-purpose PNP transistors, designed specifically for low-noise, low-current audio-frequency amplification and switching in compact surface-mount applications.

FAQ

Is BC859BW,115 RoHS compliant and lead-free?

Yes, BC859BW,115 is RoHS compliant and manufactured with lead-free terminations per Nexperia's standard product policy. The SOT323 package uses matte tin plating over nickel, and all materials meet EU Directive 2011/65/EU requirements without exemptions.

What is the maximum allowable continuous collector current at 70 °C ambient?

At T_amb = 70 °C, derating applies: P_tot drops linearly from 200 mW at 25 °C to zero at 150 °C. At 70 °C, P_tot = 150 mW, limiting I_C to approximately −86 mA assuming V_CE ≈ −5 V, per thermal and electrical limits in the datasheet.

Can BC859BW,115 replace BC859B in existing SOT23 designs?

No direct replacement: BC859BW,115 uses SOT323 (smaller) while BC859B uses SOT23. Pad layout, solder paste volume, and reflow profile differ. Mechanical adaptation is required; electrical parameters match closely, but thermal performance differs due to package size and R_{th j-a}.

Does BC859BW,115 have qualified AEC-Q101 stress test data for automotive use?

No, BC859BW,115 is not AEC-Q101 qualified. It is specified for industrial and consumer applications only. For automotive-grade PNP transistors, Nexperia offers the PBSS4041P series or BC857B-Q variants with full AEC-Q101 qualification and extended temperature screening.

BC859BW,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:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 650mV @ 5mA, 100mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 220 @ 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

BC859BW,115 FAQ

1.How can I place an order for BC859BW,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC859BW,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 BC859BW,115 reliable?

The price and inventory of BC859BW,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC859BW,115 is usually 5 days.

3.What payment methods are accepted for BC859BW,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC859BW,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC859BW,115?

BC859BW,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC859BW,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 BC859BW,115?

For technical support, including BC859BW,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC859BW,115 requirements.

6.How does Aetrix verify that BC859BW,115 is sourced from the original manufacturer or authorized distributors?

All BC859BW,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 BC859BW,115 meets industry standards.

7.What is the process for return or replacement of BC859BW,115?

All BC859BW,115 units undergo pre-shipment inspection (PSI). If there is an issue with BC859BW,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 BC859BW,115 part is unused and in its original packaging.

Return procedure for BC859BW,115:

1.Submit a request within 90 days.

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

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