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onsemi BC849BLT3G
- Part No.:
- BC849BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC849BLT3G.pdf
- Description:
- TRANS NPN 30V 0.1A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,534
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Product details
Overview
BC849BLT3G from onsemi is an NPN general-purpose silicon transistor in SOT-23 package, rated for 30 VCEO, 100 mA continuous collector current, and 225 mW power dissipation on FR-5 board; it delivers hFE = 200–450 at IC = 2.0 mA, VCE = 5.0 V, and supports low-noise amplification in signal conditioning circuits.
For engineers reviewing the BC849BLT3G datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal derating behavior, saturation voltage performance across operating currents, noise figure at 1 kHz, and validated alternative transistors for discrete amplifier and switching designs.
Technical Context
The BC849BLT3G operates as a medium-gain, low-power NPN bipolar junction transistor optimized for linear amplification and digital switching in compact PCB layouts. Its hFE range (200–450) and low VCE(sat) (≤0.25 V at IC = 10 mA, IB = 0.5 mA) support stable biasing in Class-A preamplifiers and logic-level interface stages.
Thermal design relies on its 556 °C/W junction-to-ambient resistance on FR-5 board and 417 °C/W on alumina substrate, with guaranteed operation from −55 °C to +150 °C. The device exhibits fT = 100 MHz and Cobo = 4.5 pF, enabling use in audio-frequency and low-speed digital signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum safe collector-emitter voltage before breakdown; defines upper rail limit in 24 V systems. |
| IC (continuous) | 100 mA - Absolute max DC collector current; sets load-driving capability in sensor interface or LED driver stages. |
| hFE | 200–450 @ IC = 2.0 mA, VCE = 5.0 V - Confirmed gain spread ensures predictable bias point stability across production lots. |
| VCE(sat) | ≤0.25 V @ IC = 10 mA, IB = 0.5 mA - Low saturation voltage minimizes power loss in switching applications. |
| fT | 100 MHz - Unity-gain bandwidth enables reliable small-signal amplification up to mid-audio frequencies. |
| NF | 4.0 dB @ IC = 0.2 mA, VCE = 5.0 V, f = 1 kHz - Verified noise performance for low-level analog front-end stages. |
| RJA (FR-5) | 556 °C/W - Thermal resistance value used to calculate junction temperature rise under real-world PCB conditions. |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 3-pin, Pb-free, RoHS-compliant, moisture sensitivity level 1; footprint matches JEDEC standard case 318-08 with 1.90 mm pitch (e), 2.90 mm body length (D), and 1.30 mm body width (E).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal; requires current-limited drive (e.g., 10 kΩ series resistor) to achieve specified hFE and avoid thermal runaway. |
| 2 | Emitter | Reference node for bias network; connected to ground or negative rail in common-emitter configuration. |
| 3 | Collector | Output terminal; handles full load current and dissipates heat during saturation; routed with adequate copper area for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| ESD robustness | HBM >4000 V, MM >400 V - Enables handling without special ESD precautions in assembly environments. |
| Pb-free & RoHS | Fully compliant per EU Directive 2011/65/EU - Meets environmental requirements for industrial and consumer end equipment. |
| Wide TJ range | −55 °C to +150 °C - Supports operation in automotive under-hood, industrial motor control, and outdoor electronics. |
| Low VBE(on) | 580–770 mV @ IC = 2–10 mA - Enables predictable turn-on with standard 3.3 V or 5 V microcontroller GPIOs. |
| Stable hFE vs. temp | Minimal shift over −55 °C to +125 °C per Fig. 17–20 - Reduces need for temperature-compensated bias networks in precision amplifiers. |
Applications
| Audio Pre-amplifier Stage | Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying low-level microphone or piezoelectric sensor output prior to ADC sampling. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: 4.0 dB noise figure and 100 MHz fT preserve signal integrity in 20 Hz–20 kHz audio band without added distortion. |
Use Scenario: Converting high-impedance thermistor or photodiode current into stable voltage output. IC Role / Device Role / Timing Role: Transimpedance or voltage-follower buffer stage with fixed-gain bias network. Use Value: Tight hFE spread (200–450) ensures repeatable gain calibration across production units. |
| Digital Logic Interface | LED Driver Switch |
|
Use Scenario: Level-shifting between 3.3 V MCU outputs and 5 V or 12 V peripheral control lines. IC Role / Device Role / Timing Role: Saturated switch translating logic HIGH/LOW into open-collector compatible signals. Use Value: VCE(sat) ≤0.25 V at IC/IB = 20 guarantees <100 mV drop, preserving noise margin in TTL/CMOS interfaces. |
Use Scenario: Driving indicator LEDs or low-current status lamps in embedded control panels. IC Role / Device Role / Timing Role: Constant-current switch with base resistor limiting IB to maintain IC ≤100 mA. Use Value: 225 mW power rating and 556 °C/W RJA allow continuous 20 mA LED drive on standard FR-4 without heatsinking. |
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 |
|---|---|---|---|
| BC849CLT3G | Higher hFE (420–800) at same test conditions; otherwise identical ratings and pinout. | Better suited for high-gain, low-base-drive applications like low-power RF preamps or ultra-low-current sensors. | Select BC849CLT3G when gain consistency above 400 is required; BC849BLT3G preferred for tighter hFE tolerance in feedback-critical circuits. |
| MMBT3904LT3G | Same SOT-23 package, but VCEO = 40 V, hFE = 100–300, and higher Cobo = 8 pF; not RoHS-compliant in legacy versions. | Offers higher voltage headroom but lower gain and higher capacitance - less optimal for low-noise audio paths. | Choose MMBT3904LT3G only when 40 V rating is mandatory; BC849BLT3G delivers superior noise and gain performance at 30 V. |
Compared with BC849CLT3G and MMBT3904LT3G, the BC849BLT3G balances moderate gain, low noise, and tight parameter distribution - making it ideal for cost-sensitive, space-constrained amplification where predictable hFE and minimal VCE(sat) are prioritized over maximum gain or voltage rating.
Availability
BC849BLT3G is available at Aetrix Electronics and suitable for audio pre-amplifier stages, sensor signal conditioning, digital logic interface circuits, and LED driver switches requiring stable component supply and long-term manufacturability.
Supply support for BC849BLT3G 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 management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The BC849BLT3G belongs to the BC846A–BC850C family of general-purpose NPN transistors designed for high-volume, cost-sensitive applications demanding reliability, consistent gain, and robust thermal performance in compact SOT-23 packages.
FAQ
What is the maximum collector-emitter voltage rating for BC849BLT3G?
The BC849BLT3G has a maximum collector-emitter voltage (VCEO) rating of 30 Vdc, verified per the onsemi BC846ALT1G Series datasheet Rev. 10. This rating applies under continuous DC conditions with IC ≤ 10 mA and defines the absolute upper limit before avalanche breakdown occurs. Exceeding 30 V risks irreversible device failure.
Does BC849BLT3G support operation at elevated temperatures?
Yes, BC849BLT3G is rated for junction and storage temperatures from −55 °C to +150 °C. Its thermal resistance (RJA = 556 °C/W on FR-5 board) allows calculation of actual junction temperature under load. Derating begins above 25 °C at 1.8 mW/°C, ensuring reliability in automotive and industrial environments.
What is the typical DC current gain (hFE) of BC849BLT3G and under what conditions is it measured?
The BC849BLT3G exhibits hFE = 200–450 when tested at IC = 2.0 mA and VCE = 5.0 V, per the Electrical Characteristics table on page 2 of the official datasheet. This range reflects production lot variation and is confirmed across temperature extremes (−55 °C to +125 °C), supporting stable bias design.
Is BC849BLT3G RoHS-compliant and lead-free?
Yes, BC849BLT3G is explicitly marked Pb-free, halogen-free/BFR-free, and RoHS-compliant per EU Directive 2011/65/EU, as stated in the Features section of the onsemi BC846ALT1G Series datasheet. It meets J-STD-020 moisture sensitivity level 1 and requires no special baking prior to reflow.
Can BC849BLT3G be used as a direct replacement for BC847BLT3G in existing designs?
No - BC849BLT3G is not a direct replacement for BC847BLT3G due to differing VCEO (30 V vs. 45 V) and VCBO (30 V vs. 50 V). While both share SOT-23 packaging and pinout, substituting BC849BLT3G in a 45 V circuit risks premature breakdown. Always verify voltage margins before interchange.
BC849BLT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 200 @ 2mA, 5V
- Power - Max:
- 300 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BC849BLT3G FAQ
1.How can I place an order for BC849BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for BC849BLT3G 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 BC849BLT3G reliable?
The price and inventory of BC849BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC849BLT3G is usually 5 days.
3.What payment methods are accepted for BC849BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC849BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC849BLT3G?
BC849BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC849BLT3G 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 BC849BLT3G?
For technical support, including BC849BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC849BLT3G requirements.
6.How does Aetrix verify that BC849BLT3G is sourced from the original manufacturer or authorized distributors?
All BC849BLT3G 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 BC849BLT3G meets industry standards.
7.What is the process for return or replacement of BC849BLT3G?
All BC849BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with BC849BLT3G, 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 BC849BLT3G part is unused and in its original packaging.
Return procedure for BC849BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC849BLT3G Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
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MMBT3904LT1G
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MMBT3906-7-F
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MMBT3904-TP
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MMBT2222A-7-F
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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MMBTA06LT1G
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