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Nexperia USA Inc. BC849CW,115
- Part No.:
- BC849CW,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC849CW,115.pdf
- Description:
- TRANS NPN 30V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:58,731
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Product details
Overview
BC849CW,115 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; used in low-noise audio preamplifier stages and signal amplification circuits where moderate gain and low capacitance are required.
For engineers reviewing the BC849CW,115 datasheet, BC849CW,115 pinout, BC849CW,115 application, or BC849CW,115 equivalent, this device serves as a high-gain, low-noise discrete amplifier in compact audio and portable electronics designs requiring stable DC current gain and minimal collector-emitter saturation voltage under light-to-moderate bias conditions.
Technical Context
The BC849CW operates as a silicon NPN BJT optimized for linear amplification in the audio frequency range, with verified fT ≥ 100 MHz ensuring bandwidth adequacy for wideband analog signal handling. Its low Cc (≤3 pF) and Ce (≤11 pF) minimize Miller effect and input loading in high-impedance gain stages.
Designed for surface-mount assembly on FR4 PCBs, it delivers specified hFE across IC = 1–100 mA with VCE = 5 V, and maintains low VCE(sat) (≤250 mV @ 10 mA/0.5 mA), supporting efficient switching and analog biasing in space-constrained layouts.
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 rating defining usable linear/saturation operating range |
| hFE | 420–800 @ 2 mA/5 V - DC current gain enabling high-sensitivity small-signal amplification |
| VCE(sat) | ≤250 mV @ 10 mA/0.5 mA - low saturation voltage minimizing power loss in switching or active-load applications |
| Cc | ≤3 pF @ 10 V - collector-base capacitance limiting high-frequency roll-off and feedback in amplifier designs |
| fT | ≥100 MHz @ 10 mA/5 V - transition frequency confirming suitability for audio and low-RF signal paths |
| F (Noise Figure) | ≤4 dB @ 200 μA/5 V/2 kΩ - low noise performance critical for microphone preamps and hi-fi input stages |
Pinout & Package
SOT323 plastic surface-mount package: 1.3 mm × 1.75 mm footprint, 0.65 mm pitch, 0.9 mm height; thermally rated for 625 K/W junction-to-ambient resistance on FR4 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control electrode; requires ~0.65 V forward bias to enable conduction; sensitive to ESD and layout parasitics |
| 2 | Emiter | Current source terminal; grounded reference in common-emitter configuration; defines input impedance |
| 3 | Collector | Output current sink; connects to load or next stage; must remain ≤45 V below emitter under all conditions |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain | hFE = 420–800 ensures robust small-signal amplification with minimal base drive current |
| Low noise figure | F ≤ 4 dB enables use in sensitive audio front-ends without degrading SNR |
| Low collector capacitance | Cc ≤ 3 pF reduces high-frequency instability and improves bandwidth in CE amplifiers |
| Compact SMT package | SOT323 footprint saves board area vs. TO-92 while maintaining thermal reliability on FR4 |
Applications
| Audio Preamplifier Stage | Tape Recorder Input Amplifier |
|---|---|
Use Scenario: Amplifying weak microphone or phono cartridge signals prior to filtering or digitization. IC Role / Device Role / Timing Role: NPN BJT configured in common-emitter topology providing voltage gain and impedance transformation. Use Value: High hFE and low F (≤4 dB) preserve signal fidelity and dynamic range in first-stage amplification. | Use Scenario: Boosting low-level analog audio signals from magnetic tape heads before equalization and recording. IC Role / Device Role / Timing Role: Linear amplifier operating in Class-A bias for minimal harmonic distortion. Use Value: Stable hFE across temperature and low VCE(sat) ensure consistent gain and headroom over battery life. |
| Hi-Fi Equipment Signal Buffer | Portable Audio Device Gain Stage |
Use Scenario: Isolating and driving subsequent filter or tone-control stages in stereo receivers. IC Role / Device Role / Timing Role: Emitter-follower or common-emitter buffer delivering low output impedance and high input impedance. Use Value: Low Cc (≤3 pF) prevents interaction with RC networks; SOT323 allows dense layout in multi-channel systems. | Use Scenario: Providing programmable gain in battery-powered headphone amplifiers or voice recorders. IC Role / Device Role / Timing Role: Discrete gain element controlled by digital biasing circuitry for adaptive sensitivity. Use Value: 100 mA IC rating supports peak transient currents; 200 mW Ptot enables sustained operation within thermal limits. |
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 |
|---|---|---|---|
| BC847CW,115 | VCEO = 45 V, hFE = 420–800, but lower fT (min. 100 MHz same), identical SOT323 package and pinout | Same audio/low-noise use cases; slightly lower max IC (100 mA same) but tighter hFE binning | Select when tighter hFE tolerance is required without changing layout or bias network |
| MMBT3904LT1G | VCEO = 40 V, hFE = 100–300 @ 10 mA, higher Cc (≈8 pF), same SOT23-3 package but different pinout (E-B-C vs B-E-C) | Acceptable for non-critical switching or medium-gain amplification; not drop-in due to pinout mismatch and lower gain | Choose only if redesigning PCB layout and accepting reduced gain/noise performance |
Compared with BC849CW,115, BC847CW,115 offers identical gain and voltage specs with tighter production spread, while MMBT3904LT1G trades gain and noise performance for broader industry availability-neither is pin-compatible without layout revision.
Availability
BC849CW,115 is available at Aetrix Electronics and suitable for audio preamplifier stages, tape recorder input circuits, and portable device gain blocks requiring stable component supply and long-term obsolescence management.
Supply support for BC849CW,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 BC849CW belongs to Nexperia's BC84xW series of general-purpose NPN transistors, designed specifically for low-noise, high-gain analog signal conditioning in compact audio and portable electronics.
FAQ
Is BC849CW,115 RoHS compliant and lead-free?
Yes, BC849CW,115 is RoHS compliant and manufactured with lead-free terminations per Nexperia's standard product policy. The SOT323 package uses matte tin plating, and full compliance documentation is available via Nexperia's product change notifications and material declarations portal.
What is the maximum allowable junction temperature for continuous operation?
The absolute maximum junction temperature (Tj) is 150 °C. Continuous operation at this limit requires derating power dissipation according to Rth j-a = 625 K/W on FR4; at 25 °C ambient, maximum usable Ptot is 200 mW, decreasing linearly to zero at 150 °C junction.
Does BC849CW,115 have a PNP complement in the same package?
Yes, the PNP complement is BC859CW,115 - also in SOT323, with matching VCEO = −30 V, IC = −100 mA, and hFE = 420–800. Both share identical pinout (1=base, 2=emitter, 3=collector), enabling direct pairing in push-pull or differential amplifier topologies.
Can BC849CW,115 be used in switching applications?
Yes, it supports switching with VCE(sat) ≤ 250 mV at 10 mA/0.5 mA and ≤ 600 mV at 100 mA/5 mA. However, its primary design intent is linear amplification; for high-speed or high-efficiency switching, dedicated small-signal switches like BC846BW offer faster turn-on/off characteristics.
BC849CW,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:
- 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
BC849CW,115 FAQ
1.How can I place an order for BC849CW,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC849CW,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 BC849CW,115 reliable?
The price and inventory of BC849CW,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC849CW,115 is usually 5 days.
3.What payment methods are accepted for BC849CW,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC849CW,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC849CW,115?
BC849CW,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC849CW,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 BC849CW,115?
For technical support, including BC849CW,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC849CW,115 requirements.
6.How does Aetrix verify that BC849CW,115 is sourced from the original manufacturer or authorized distributors?
All BC849CW,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 BC849CW,115 meets industry standards.
7.What is the process for return or replacement of BC849CW,115?
All BC849CW,115 units undergo pre-shipment inspection (PSI). If there is an issue with BC849CW,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 BC849CW,115 part is unused and in its original packaging.
Return procedure for BC849CW,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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