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Nexperia USA Inc. BC850CW,135
- Part No.:
- BC850CW,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC850CW,135.pdf
- Description:
- TRANS NPN 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:9,235
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Product details
Overview
BC850CW,135 from Nexperia is an NPN general-purpose bipolar junction transistor in SOT323 package, rated for 45 V VCEO, 100 mA IC, and featuring hFE of 420–800 at 2 mA/5 V. It serves as a low-noise amplifying or switching element in audio-frequency signal paths, especially in compact consumer audio equipment.
For engineers reviewing the BC850CW,135 datasheet, BC850CW,135 pinout, BC850CW,135 application, or BC850CW,135 equivalent, key selection criteria include DC current gain consistency across production lots, low noise figure (≤4 dB at 1 kHz), saturation voltage under 600 mV at 100 mA, and thermal resistance (625 K/W) on FR4 PCBs.
Technical Context
This transistor operates in linear or active-switching modes with base-emitter forward voltage between 580–770 mV depending on collector current. Its transition frequency fT of 100 MHz supports stable amplification up to mid-audio frequencies without phase degradation.
The device exhibits low leakage: ICBO ≤15 nA at 30 V and 25 °C, rising to ≤5 μA at 150 °C junction temperature. Capacitance values-Cc ≤3 pF and Ce ≈11 pF-enable predictable high-frequency impedance matching in discrete amplifier stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC (DC) | 100 mA - continuous collector current limit defining usable output drive capability |
| hFE | 420–800 - DC current gain range at 2 mA/5 V, critical for bias stability in amplifier designs |
| VCE(sat) | ≤600 mV at 100 mA/5 mA - low saturation voltage enabling efficient switching with minimal power loss |
| fT | 100 MHz - transition frequency confirming usable bandwidth for audio and low-speed digital signal conditioning |
| Rth j-a | 625 K/W - thermal resistance on FR4 board, determining junction temperature rise per watt dissipated |
| F (noise) | ≤4 dB at 1 kHz - low noise figure essential for first-stage preamplifier applications |
Pinout & Package
SOT323 plastic surface-mount package: 1.3 mm × 2.2 mm footprint, 0.95 mm height, 3-lead configuration with gull-wing terminations. Designed for reflow soldering on standard FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Current-controlled input node; requires ~0.6 V forward bias for turn-on; sensitive to ESD |
| 2 | Emitter | Common reference terminal in common-emitter configuration; connected to ground or signal return path |
| 3 | Collector | Output current sink node; carries full load current and dissipates most power in active operation |
Key Features
| Feature | Design Value |
|---|---|
| High hFE grade | 420–800 at 2 mA/5 V ensures stable bias point with minimal base drive current |
| Low noise performance | ≤4 dB noise figure at 1 kHz enables use in microphone preamps and tape head amplifiers |
| Controlled saturation behavior | VCE(sat) ≤250 mV at 10 mA/0.5 mA supports clean digital switching in logic interface circuits |
| Thermal robustness | 150 °C max junction temperature and −65 °C min storage temperature suit industrial ambient ranges |
Applications
| Audio Preamplifier Stage | Tape Recorder Signal Path |
|---|---|
Use Scenario: First-stage amplification of low-level analog signals from electret microphones or magnetic tape heads. IC Role / Device Role / Timing Role: NPN small-signal amplifier operating in common-emitter configuration with fixed bias network. Use Value: High hFE minimizes required base current; low noise figure preserves SNR in sub-mV input signals. | Use Scenario: Signal conditioning and equalization in portable cassette playback circuitry. IC Role / Device Role / Timing Role: Linear amplifier with emitter degeneration for controlled gain and distortion profile. Use Value: Stable hFE across temperature ensures consistent frequency response during extended playback sessions. |
| Hi-Fi Equipment Input Buffer | Consumer Audio Tone Control |
Use Scenario: Impedance transformation between passive tone stacks and downstream op-amp stages. IC Role / Device Role / Timing Role: Common-collector (emitter-follower) buffer providing low-output impedance drive. Use Value: Low VBE variation (580–770 mV) maintains DC offset stability across unit-to-unit production. | Use Scenario: Discrete gain-setting stage in bass/treble adjustment networks of stereo receivers. IC Role / Device Role / Timing Role: Current-controlled variable-gain amplifier with potentiometer-based emitter bias. Use Value: Tight hFE distribution (420–800) reduces need for per-unit calibration in mass-produced units. |
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,135 | VCEO = 30 V (vs. 45 V); hFE = 200–450 (vs. 420–800) | Limited to lower-voltage audio stages where supply rails ≤24 V | Select when lower gain tolerance and reduced voltage rating are acceptable for cost-sensitive designs |
| MMBT3904LT1G | VCEO = 40 V; hFE = 100–300 at 10 mA; Rth j-a = 400 K/W (SOT-23) | Better thermal performance but lower gain consistency; wider hFE spread affects bias predictability | Prefer for higher-power dissipation scenarios where gain spread is less critical than thermal margin |
Compared with BC849CW,135 and MMBT3904LT1G, BC850CW,135 offers superior gain uniformity and higher voltage rating-critical for reliable operation in 36 V rail audio systems-while maintaining low-noise performance unmatched by mainstream SOT-23 alternatives.
Availability
BC850CW,135 is available at Aetrix Electronics and suitable for audio preamplifier stages, tape recorder signal paths, hi-fi equipment input buffers, and consumer audio tone control circuits requiring stable component supply and tight hFE binning.
Supply support for BC850CW,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, specializing in automotive, industrial, computing, and consumer-grade components.
The BC850CW,135 belongs to Nexperia's general-purpose bipolar transistor product line, engineered for high-reliability, low-noise analog signal conditioning in space-constrained consumer audio applications.
FAQ
What is the maximum allowable collector-emitter voltage for BC850CW,135?
The absolute maximum VCEO is 45 V under open-base conditions at Tamb ≤25 °C. Exceeding this value risks avalanche breakdown and permanent device failure. Derating is required above 25 °C ambient, with junction temperature limited to 150 °C. This rating makes it suitable for 36 V rail audio systems but not for 48 V telecom or industrial bus applications.
Does BC850CW,135 have a specified noise figure, and under what conditions?
Yes, BC850CW,135 has a noise figure of ≤4 dB measured at IC = 200 μA, VCE = 5 V, RS = 2 kΩ, f = 1 kHz, and B = 200 Hz bandwidth. This specification is validated per the original NXP data sheet and confirms suitability for low-level analog amplification where signal integrity is critical.
Can BC850CW,135 be used in switching applications, and what is its typical VCE(sat)?
Yes, BC850CW,135 supports switching operation with VCE(sat) ≤250 mV at IC = 10 mA and IB = 0.5 mA, and ≤600 mV at IC = 100 mA and IB = 5 mA. These values ensure low conduction loss in low-power digital interface or LED driver applications, though it is not optimized for high-speed switching (>1 MHz).
What is the package type and lead finish of BC850CW,135?
BC850CW,135 uses the SOT323 (SC-70) plastic surface-mount package with gull-wing leads. The lead finish is matte tin (Sn), compliant with JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), and qualified for standard reflow soldering profiles including Pb-free processes.
BC850CW,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:
- 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,135 FAQ
1.How can I place an order for BC850CW,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC850CW,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 BC850CW,135 reliable?
The price and inventory of BC850CW,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC850CW,135 is usually 5 days.
3.What payment methods are accepted for BC850CW,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC850CW,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC850CW,135?
BC850CW,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC850CW,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 BC850CW,135?
For technical support, including BC850CW,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC850CW,135 requirements.
6.How does Aetrix verify that BC850CW,135 is sourced from the original manufacturer or authorized distributors?
All BC850CW,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 BC850CW,135 meets industry standards.
7.What is the process for return or replacement of BC850CW,135?
All BC850CW,135 units undergo pre-shipment inspection (PSI). If there is an issue with BC850CW,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 BC850CW,135 part is unused and in its original packaging.
Return procedure for BC850CW,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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