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onsemi BC850CMTF
- Part No.:
- BC850CMTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC850CMTF.pdf
- Description:
- TRANS NPN 45V 0.1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:136,581
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Product details
Overview
BC850CMTF from onsemi is an NPN epitaxial silicon transistor in SOT-23 package, optimized for low-noise amplifier applications with hFE of 420–800 at IC = 2 mA, VCE = 5 V, and noise figure of 1.4–3.0 dB (30–15 kHz bandwidth). It supports switching and linear amplification in compact analog front-ends, sensor signal conditioning, and audio preamplifier stages.
For engineers reviewing the BC850CMTF datasheet, pinout, applications, or equivalent options, key selection criteria include its low-noise performance, SOT-23 footprint compatibility, hFE classification C, and VCEO = 45 V rating for general-purpose small-signal use.
Technical Context
The BC850CMTF operates as a discrete NPN bipolar junction transistor with epitaxial base construction, enabling high fT = 300 MHz and low Cob = 3.5–6.0 pF at VCB = 10 V. Its low VBE(on) (580–700 mV) and tight hFE binning support stable biasing in DC-coupled gain stages.
Designed for automatic insertion in thin-film circuits, it features low ICBO = 15 nA and thermal resistance RθJA = 403°C/W. The device is explicitly characterized for noise performance across 30–15 kHz - a specification unique to the BC850 variant within the BC846–BC850 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown; enables use in 24 V rail amplifier stages with margin. |
| hFE (Class C) | 420–800 - Tight DC current gain range ensures predictable bias point stability in production amplifier designs. |
| Noise Figure | 1.4–3.0 dB (30–15 kHz) - Verified low-noise performance critical for microphone preamps and sensor interfaces. |
| fT | 300 MHz - Supports RF amplifier operation up to VHF band and fast-switching response in pulse circuits. |
| PD | 310 mW - Power dissipation limit at TA = 25°C; derates 2.48 mW/°C above ambient. |
| Cob | 3.5–6.0 pF - Low output capacitance minimizes Miller effect in high-gain common-emitter configurations. |
Pinout & Package
SOT-23 3-lead plastic surface-mount package with standard pin assignment: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control electrode | Receives input current to modulate collector current; requires current-limiting resistor in most bias networks. |
| 2 (Emitter) | Current source terminal | Common reference node in common-emitter configuration; connects to ground or emitter degeneration resistor. |
| 3 (Collector) | Output current terminal | Delivers amplified current to load; placed at higher potential than emitter in active mode operation. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise amplifier grade | BC850-specific noise figure of 1.4–3.0 dB over 30–15 kHz - verified per datasheet, not shared with BC846/BC847/BC848. |
| hFE Class C binning | Guaranteed 420–800 hFE at IC = 2 mA, VCE = 5 V - reduces need for post-production gain trimming. |
| High fT / low Cob combination | 300 MHz fT with only 3.5–6.0 pF output capacitance - enables wideband amplification without excessive compensation. |
| SOT-23 tape-and-reel packaging | Standardized automated assembly compatibility; "MTF" suffix confirms tape-and-reel delivery per J-STD-020. |
Applications
| Audio Preamp Stage | Sensor Signal Conditioning |
|---|---|
Use Scenario: Low-level microphone or piezoelectric sensor signal amplification prior to ADC sampling. IC Role / Device Role / Timing Role: Discrete NPN transconductance amplifier in common-emitter topology with emitter degeneration. Use Value: 1.4–3.0 dB noise figure directly improves SNR in sub-10 mVpp input signals without requiring op-amp alternatives. |
Use Scenario: Amplifying weak DC-coupled outputs from temperature, pressure, or strain gauges. IC Role / Device Role / Timing Role: Linear small-signal amplifier with stable hFE (420–800) for predictable gain calibration. Use Value: Tight hFE binning eliminates unit-to-unit gain variation, reducing factory calibration burden. |
| Switching Interface Driver | RF Front-End Amplifier |
Use Scenario: Driving LED indicators, optocoupler inputs, or logic-level MOSFET gates from MCU GPIO. IC Role / Device Role / Timing Role: Saturated switch with VCE(sat) ≤ 250 mV at IC = 10 mA / IB = 0.5 mA. Use Value: Low saturation voltage ensures minimal power loss and reliable logic-level translation at 3.3 V/5 V rails. |
Use Scenario: First-stage amplification in 30–100 MHz receiver front-ends (e.g., ISM band receivers). IC Role / Device Role / Timing Role: Common-emitter RF amplifier leveraging 300 MHz fT and low Cob. Use Value: 300 MHz fT and 3.5–6.0 pF Cob enable stable gain up to ~100 MHz without neutralization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC847CMTF | VCEO = 45 V (same), but noise figure = 2.0–10.0 dB (1 kHz); no BC850-grade low-noise spec. | Acceptable where noise < 10 dB is sufficient; unsuitable for < 3 dB SNR-critical audio/sensor paths. | Select BC847CMTF only when cost sensitivity outweighs noise performance requirements. |
| MMBT3904LT1G | hFE = 100–300 (lower max), VCEO = 40 V, noise figure not specified; SOT-23 compatible pinout. | Valid for general-purpose switching; lacks verified low-noise characterization for analog front-ends. | Choose MMBT3904LT1G for non-critical digital interface or cost-driven commodity switching. |
Compared with BC847CMTF and MMBT3904LT1G, the BC850CMTF uniquely delivers guaranteed low-noise performance (1.4–3.0 dB) alongside high hFE and 45 V VCEO, making it the only option among the three qualified for precision analog signal amplification.
Availability
BC850CMTF is available at Aetrix Electronics and suitable for audio preamplifiers, sensor signal conditioners, RF front-end amplifiers, and switching interface drivers requiring stable component supply and consistent hFE binning.
Supply support for BC850CMTF 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BC850CMTF belongs to onsemi's legacy small-signal transistor product line, designed specifically for high-fidelity analog signal amplification and low-noise applications where precision gain and spectral purity are essential.
FAQ
What is the maximum collector-emitter voltage rating for BC850CMTF?
The BC850CMTF has a VCEO rating of 45 V, meaning it can safely sustain up to 45 volts between collector and emitter under DC conditions at TA = 25°C. This rating is lower than BC846 (65 V) but matches BC847 and exceeds BC848 (30 V), positioning BC850CMTF for 24 V system-level analog stages with safety margin.
Does BC850CMTF have a guaranteed noise figure specification?
Yes - the BC850CMTF is explicitly characterized for noise performance: 1.4–3.0 dB over 30–15,000 Hz at VCE = 5 V, IC = 200 μA, and RG = 2 kΩ. This specification distinguishes BC850CMTF from BC846/BC847/BC848 and is confirmed in the official onsemi BC846/D datasheet Rev. 2.
What does the "C" in BC850CMTF indicate?
The "C" in BC850CMTF denotes hFE classification: guaranteed DC current gain of 420–800 at IC = 2 mA and VCE = 5 V. This is the highest gain bin in the BC850 series, enabling higher circuit gain with fewer stages and tighter production consistency than Class A (110–220) or Class B (200–450).
Is BC850CMTF pin-compatible with other transistors in the BC846–BC850 family?
Yes - BC850CMTF uses the standard SOT-23 package with identical pinout (Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector) as all BC846/BC847/BC848/BC850 variants. This allows direct PCB substitution within the same family, provided VCEO, noise, and hFE requirements align with the design intent.
What is the thermal resistance (RθJA) of BC850CMTF?
The BC850CMTF has a junction-to-ambient thermal resistance of 403°C/W under standard FR-4 PCB conditions (76 mm × 114 mm, minimum land pattern). This value assumes natural convection cooling and defines the temperature rise per milliwatt dissipated - critical for thermal design in enclosed or high-density layouts.
BC850CMTF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- 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:
- 310 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BC850CMTF FAQ
1.How can I place an order for BC850CMTF through Aetrix?
Please submit a Request for Quotation (RFQ) for BC850CMTF 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 BC850CMTF reliable?
The price and inventory of BC850CMTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC850CMTF is usually 5 days.
3.What payment methods are accepted for BC850CMTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC850CMTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC850CMTF?
BC850CMTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC850CMTF 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 BC850CMTF?
For technical support, including BC850CMTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC850CMTF requirements.
6.How does Aetrix verify that BC850CMTF is sourced from the original manufacturer or authorized distributors?
All BC850CMTF 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 BC850CMTF meets industry standards.
7.What is the process for return or replacement of BC850CMTF?
All BC850CMTF units undergo pre-shipment inspection (PSI). If there is an issue with BC850CMTF, 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 BC850CMTF part is unused and in its original packaging.
Return procedure for BC850CMTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC850CMTF Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
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