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Nexperia USA Inc. BC859CW,135
- Part No.:
- BC859CW,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC859CW,135.pdf
- Description:
- TRANS PNP 30V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:7,605
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Product details
Overview
BC859CW,135 from Nexperia is a PNP general-purpose bipolar junction transistor in SOT323 package, rated for −45 V VCEO, −100 mA IC, with hFE range 420–800 at −2 mA/−5 V, and VCE(sat) ≤ −300 mV at −10 mA/−0.5 mA. It serves as an amplifying or switching device in low-noise audio signal paths and bias networks.
For engineers reviewing the BC859CW,135 datasheet, BC859CW,135 pinout, BC859CW,135 application, or BC859CW,135 equivalent, key selection criteria include DC current gain consistency across temperature, low noise figure (≤4 dB at 1 kHz), tight VBE matching (600–750 mV), and SOT323 thermal resistance (625 K/W) for compact board-level designs.
Technical Context
This PNP BJT operates in linear or saturation mode with verified performance at Tj up to 150 °C and ambient range −65 °C to +150 °C. Its fT of 100 MHz supports audio-frequency amplification and low-speed switching, while Cc = 5 pF and Ce = 10 pF define high-frequency stability limits.
The device uses silicon planar epitaxial construction with base-emitter junction optimized for low noise (4 dB at 1 kHz, 2 kΩ source) and consistent hFE distribution-BC859CW grade guarantees minimum hFE = 420, distinguishing it from BC859W (min 220) and BC859BW (min 220).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage under open-base condition; defines usable supply headroom in PNP emitter-follower or common-emitter stages. |
| IC (DC) | −100 mA: Continuous collector current rating; sets upper limit for load drive capability in bias networks or preamp stages. |
| hFE | 420–800 @ −2 mA/−5 V: Confirmed DC current gain range; enables predictable bias point setting without trimming in production audio circuits. |
| VCE(sat) | ≤ −300 mV @ −10 mA/−0.5 mA: Low saturation voltage ensures minimal power loss and voltage drop in switching applications. |
| fT | 100 MHz: Transition frequency confirms suitability for audio-band amplification and low-speed digital signal conditioning. |
| F (Noise Figure) | ≤ 4 dB @ 1 kHz, 2 kΩ source: Verified low-noise performance critical for tape recorder input stages and hi-fi preamplifiers. |
| Rth j-a | 625 K/W: Junction-to-ambient thermal resistance on FR4 PCB; informs derating requirements for sustained operation near Ptot = 200 mW. |
Pinout & Package
SOT323 plastic surface-mounted package (3 leads), dimensions: 2.2 × 1.35 × 0.95 mm (L × W × H), with gull-wing lead form and 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to turn on. |
| 2 | Emitter | Current source terminal in PNP configuration; connected to higher potential rail in most amplifier topologies. |
| 3 | Collector | Current sink terminal; output node in common-emitter or common-base configurations; polarity-sensitive for voltage ratings. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise audio-grade hFE binning | Guaranteed hFE 420–800 ensures matched pair stability and minimal gain variation in differential preamp inputs. |
| Optimized emitter-base junction | 4 dB noise figure at 1 kHz enables use in tape head preamps where signal integrity below 20 kHz is critical. |
| SOT323 thermal performance | 625 K/W Rth j-a allows 200 mW dissipation on standard FR4 without heatsinking-sufficient for line-level analog stages. |
| High fT / low capacitance | 100 MHz fT with Cc = 5 pF supports stable gain up to 10× audio bandwidth without peaking or oscillation. |
Applications
| Tape Recorder Input Stage | Hi-Fi Preamplifier Bias Network |
|---|---|
Use Scenario: Amplifies low-level magnetic tape playback signals before equalization and further gain stages. IC Role / Device Role / Timing Role: PNP BJT configured as common-emitter amplifier with emitter degeneration for linearity and noise control. Use Value: 4 dB noise figure and 420–800 hFE ensure high SNR and repeatable DC operating point across production units. | Use Scenario: Sets quiescent current in discrete Class-A voltage amplifier stages using complementary PNP/NPN pairs. IC Role / Device Role / Timing Role: Active current source/sink in emitter-follower or cascode bias chains. Use Value: Tight VBE (600–750 mV) and low VCE(sat) enable precise, thermally stable biasing without external trimmers. |
| Portable Audio Signal Switching | Industrial Sensor Interface Front-End |
Use Scenario: Low-power analog multiplexing or mute control in battery-powered headphone amplifiers and portable mixers. IC Role / Device Role / Timing Role: PNP switch enabling/disabling signal path via base current control. Use Value: −300 mV VCE(sat) minimizes insertion loss and preserves dynamic range in signal routing paths. | Use Scenario: Amplifies millivolt-level outputs from RTDs, thermocouples, or bridge sensors in industrial PLC input modules. IC Role / Device Role / Timing Role: First-stage low-noise amplifier in instrumentation-grade transducer signal conditioning. Use Value: Verified −15 nA ICBO at −30 V and 25 °C ensures negligible leakage-induced offset drift over time and temperature. |
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 | Lower hFE range (220–475); same VCEO (−45 V), identical SOT323 package. | Less suitable for high-gain, low-noise preamp stages requiring >400 hFE. | Select when cost sensitivity outweighs gain consistency needs and noise is less critical. |
| MMBT3906LT1G | Higher VCEO (−40 V), wider hFE spread (100–300), slightly higher VCE(sat) (−400 mV). | Not recommended for precision low-noise audio due to higher noise figure (~10 dB) and looser hFE binning. | Prefer for non-critical switching or digital logic interface where gain tolerance is relaxed. |
Compared with BC859CW,135, BC857BW,115 trades gain consistency for lower cost, while MMBT3906LT1G offers broader availability but sacrifices noise performance and hFE predictability-making BC859CW,135 optimal for production audio front-ends demanding repeatability and low-noise operation.
Availability
BC859CW,135 is available at Aetrix Electronics and suitable for tape recorder input stages, hi-fi preamplifier bias networks, and portable audio signal switching requiring stable component supply, consistent hFE binning, and low-noise performance.
Supply support for BC859CW,135 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, with focus on automotive, industrial, computing, and consumer markets.
The BC859CW,135 belongs to Nexperia's general-purpose PNP transistor product line, engineered specifically for reliable, low-noise amplification and switching in space-constrained audio and sensor interface applications.
FAQ
What is the maximum continuous collector current for BC859CW,135?
The BC859CW,135 has a maximum continuous collector current (IC) of −100 mA at Tamb ≤ 25 °C, derated linearly above that temperature per its 625 K/W thermal resistance. At elevated ambient temperatures, the safe operating current decreases to maintain junction temperature ≤ 150 °C.
Is BC859CW,135 pin-compatible with BC849W or BC850W?
No-BC849W and BC850W are NPN complements to the BC859W/BC860W series and share the same SOT323 package and pinout (1=base, 2=emitter, 3=collector), but their polarity and biasing requirements differ fundamentally. Direct substitution without circuit redesign will result in non-functional operation.
Does BC859CW,135 meet automotive qualification standards?
The BC859CW,135 is not AEC-Q101 qualified. It is specified for industrial and consumer applications per its data sheet limits (Tstg = −65 °C to +150 °C, Tj ≤ 150 °C), but lacks automotive-specific stress testing, failure rate reporting, or PPAP documentation required for automotive use.
How does the BC859CW,135 differ from BC859W in practical design?
BC859CW,135 guarantees minimum hFE = 420 (vs. 220 for BC859W), enabling more predictable biasing in high-gain analog stages without manual selection. Its tighter hFE distribution reduces unit-to-unit variation in production audio circuits, lowering test time and calibration overhead.
BC859CW,135 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,135 FAQ
1.How can I place an order for BC859CW,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC859CW,135 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,135 reliable?
The price and inventory of BC859CW,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC859CW,135 is usually 5 days.
3.What payment methods are accepted for BC859CW,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC859CW,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC859CW,135?
BC859CW,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC859CW,135 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,135?
For technical support, including BC859CW,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC859CW,135 requirements.
6.How does Aetrix verify that BC859CW,135 is sourced from the original manufacturer or authorized distributors?
All BC859CW,135 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,135 meets industry standards.
7.What is the process for return or replacement of BC859CW,135?
All BC859CW,135 units undergo pre-shipment inspection (PSI). If there is an issue with BC859CW,135, 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,135 part is unused and in its original packaging.
Return procedure for BC859CW,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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