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Nexperia USA Inc. BC859CW,115
- Part No.:
- BC859CW,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC859CW,115.pdf
- Description:
- TRANS PNP 30V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:3,024
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Product details
Overview
BC859CW,115 from Nexperia is a PNP general-purpose bipolar junction transistor in SOT323 package, rated for −45 V VCEO, −100 mA IC, and 200 mW Ptot, with hFE range 420–800 at −2 mA/−5 V; used in low-noise audio preamplifier stages of hi-fi equipment and tape recorders.
For engineers reviewing the BC859CW,115 datasheet, BC859CW,115 pinout, BC859CW,115 application, or BC859CW,115 equivalent, key selection criteria include DC current gain consistency across temperature, low noise figure (4 dB at 1 kHz), VCEsat ≤ −300 mV at −10 mA/−0.5 mA drive, and SOT323 thermal resistance (625 K/W) for surface-mount audio bias networks.
Technical Context
This PNP transistor operates in linear amplification mode with fixed-base biasing or emitter-follower configuration. Its hFE variation is specified across −2 mA to −100 mA collector current and −5 V to −45 V VCE, supporting stable small-signal gain in cascaded audio stages.
Noise performance is characterized at 200 μA IC, 5 V |VCE|, 2 kΩ source impedance, and 200 Hz bandwidth-meeting requirements for analog signal conditioning where SNR > 70 dB is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage before breakdown in open-base configuration. |
| IC (DC) | −100 mA: Continuous collector current rating defining maximum linear output swing capability. |
| hFE | 420–800 @ −2 mA/−5 V: Guaranteed DC current gain range enabling predictable bias point setting. |
| VCEsat | ≤ −300 mV @ −10 mA/−0.5 mA: Low saturation voltage ensures minimal voltage drop in switching or active-load applications. |
| fT | 100 MHz: Transition frequency confirming usable gain up to mid-VHF, suitable for wideband audio and IF stages. |
| Noise Figure | 4 dB @ 1 kHz, 200 μA, 2 kΩ: Quantified low-noise performance essential for microphone preamps and phono stages. |
| Rth j-a | 625 K/W: Thermal resistance on FR4 PCB defines required copper area for thermal management at full power. |
Pinout & Package
SOT323 plastic surface-mount package (2.2 mm × 1.35 mm × 0.95 mm), 3-lead, lead-free and RoHS compliant. Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Current-controlled input node; requires series resistor to limit IB and stabilize Q-point. |
| 2 | Emitter | Common terminal in common-base configuration; connects to ground or bias rail in common-emitter designs. |
| 3 | Collector | Output node carrying inverted, amplified current; ties to load resistor or next stage input. |
Key Features
| Feature | Design Value |
|---|---|
| High hFE grade | 420–800 range enables precise DC bias design with reduced sensitivity to component tolerance. |
| Low noise figure | 4 dB at 1 kHz allows use in first-stage amplification without degrading system SNR. |
| Low VCEsat | ≤ −300 mV at −10 mA supports efficient operation in low-voltage audio rails (e.g., ±5 V systems). |
| SOT323 footprint | Compact 2.2 × 1.35 mm outline enables high-density layout in portable audio PCBs. |
Applications
| Audio Preamp Stage | Signal Inverter |
|---|---|
Use Scenario: First amplification stage in phono preamplifier circuits handling low-level RIAA-equalized signals. IC Role / Device Role / Timing Role: PNP small-signal amplifier providing voltage gain and impedance transformation. Use Value: 4 dB noise figure and 420–800 hFE ensure high-fidelity signal recovery with minimal added distortion. | Use Scenario: Polarity inversion in differential line drivers for balanced audio outputs. IC Role / Device Role / Timing Role: Active inverting element in discrete emitter-follower or common-emitter topology. Use Value: ≤ −300 mV VCEsat preserves headroom in ±5 V rails while delivering clean inverted output. |
| Tape Recorder Bias Oscillator | Hi-Fi Tone Control Buffer |
Use Scenario: Generating 100 kHz AC bias signal in analog cassette recorder head drivers. IC Role / Device Role / Timing Role: Linear oscillator transistor in Colpitts or Hartley configuration. Use Value: 100 MHz fT supports stable oscillation at bias frequencies with low phase noise. | Use Scenario: Isolating tone control network from power amplifier input impedance in active equalizers. IC Role / Device Role / Timing Role: Unity-gain emitter follower providing high input impedance and low output impedance. Use Value: High hFE minimizes base current loading, preserving filter response accuracy. |
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 | hFE 220–475; VCEO = −45 V; same SOT323 package | Lower gain range reduces bias stability margin in high-precision preamps | Select when cost sensitivity outweighs gain consistency requirements |
| MMBT3906LT1G | hFE 100–300; VCEO = −40 V; SOT23 package (larger footprint) | Lower fT (250 MHz typical but not guaranteed); higher VCEsat (−400 mV min) | Choose only if SOT23 board space and legacy footprint compatibility are mandatory |
Compared with BC859CW,115, BC857BW,115 offers lower gain consistency for cost-driven consumer audio, while MMBT3906LT1G trades guaranteed low-noise performance and tight hFE for broader industry availability in SOT23-making BC859CW,115 optimal for noise-critical, gain-stable designs.
Availability
BC859CW,115 is available at Aetrix Electronics and suitable for audio preamplifiers, tape recorder bias oscillators, hi-fi tone control buffers, and low-noise signal inverters requiring stable component supply and consistent hFE grading.
Supply support for BC859CW,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, serving automotive, industrial, computing, and consumer markets with high-volume, high-reliability components.
BC859CW,115 belongs to Nexperia's general-purpose bipolar transistor product line, engineered for low-noise, high-gain analog signal conditioning in compact portable and home audio systems.
FAQ
What is the maximum operating temperature for BC859CW,115?
The BC859CW,115 has a maximum junction temperature (Tj) 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 appropriate copper pour for sustained 100 mA operation.
Is BC859CW,115 pin-compatible with BC849W?
No-BC859CW,115 is a PNP transistor while BC849W is its NPN complement; both share identical SOT323 pinout (Base–Emitter–Collector on pins 1–2–3), but polarity reversal means direct substitution would invert circuit function and likely cause failure without topology redesign.
Does BC859CW,115 meet RoHS and REACH requirements?
Yes-BC859CW,115 is manufactured by Nexperia as a lead-free, RoHS-compliant device per Directive 2011/65/EU and satisfies REACH SVHC screening requirements. The SOT323 package uses matte tin plating and halogen-free molding compound, verified in Nexperia's compliance documentation dated 2022.
What is the typical noise figure at 10 kHz?
The BC859CW,115 noise figure is specified as 4 dB at 1 kHz with 200 μA IC, 5 V |VCE|, and 2 kΩ source resistance. At 10 kHz, measured data shows <4.5 dB under identical conditions, consistent with its 100 MHz fT and optimized base doping profile for audio-band noise minimization.
BC859CW,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:
- 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
BC859CW,115 FAQ
1.How can I place an order for BC859CW,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC859CW,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 BC859CW,115 reliable?
The price and inventory of BC859CW,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC859CW,115 is usually 5 days.
3.What payment methods are accepted for BC859CW,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC859CW,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC859CW,115?
BC859CW,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC859CW,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 BC859CW,115?
For technical support, including BC859CW,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC859CW,115 requirements.
6.How does Aetrix verify that BC859CW,115 is sourced from the original manufacturer or authorized distributors?
All BC859CW,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 BC859CW,115 meets industry standards.
7.What is the process for return or replacement of BC859CW,115?
All BC859CW,115 units undergo pre-shipment inspection (PSI). If there is an issue with BC859CW,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 BC859CW,115 part is unused and in its original packaging.
Return procedure for BC859CW,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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