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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi BC447G

Name: BC447G
Brand: onsemi
SKU: BC447G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC447G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body

Datasheet:: BC447G.pdf

Description:: TRANS NPN 80V 0.3A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:2,838

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Product details

Overview

BC447G from onsemi is an NPN silicon general-purpose transistor rated for 80 V_CEO, 300 mA continuous collector current, and 625 mW power dissipation at T_A = 25°C, commonly used in low-power switching and linear amplification circuits in industrial control and consumer electronics.

For engineers reviewing the BC447G datasheet, pinout, applications, or equivalent options, key selection criteria include its 80 V breakdown voltage, h_FE range of 50–460 at I_C = 2 mA, V_CE(sat) ≤ 0.25 V at I_C/I_B = 10, TO-92 package compatibility, and Pb-free compliance per J-STD-020 MSL Level 1.

Technical Context

The BC447G operates as a medium-voltage, medium-current NPN bipolar junction transistor optimized for DC-coupled amplification and saturated-switching applications. Its f_T of 100–200 MHz supports RF-capable small-signal use up to VHF, while its V_BE(on) of 0.55–0.76 V at I_C = 2 mA enables predictable base drive design.

Thermal performance is defined by R_JA = 200 °C/W and R_JC = 83.3 °C/W, with safe operating area limited by second breakdown above 100 mA and 20 V. The device maintains stable h_FE across −55°C to +150°C junction temperature range and exhibits <100 nA I_CBO at 60 V_CB.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Supports operation in 48 V and 60 V rail systems without breakdown risk under open-emitter conditions.
I_C (continuous)	300 mA - Sufficient for driving relays, LEDs, and small solenoids in discrete logic interface stages.
P_D @ T_A = 25°C	625 mW - Enables ambient-temperature operation without heatsinking in low-duty-cycle switching.
h_FE (min/typ/max)	50 / 220 / 460 at I_C = 2 mA - Ensures reliable gain margin for bias-stable amplifier designs across process variation.
V_CE(sat)	≤ 0.25 V at I_C = 100 mA, I_B = 10 mA - Minimizes conduction loss and self-heating in saturated switch mode.
f_T	100–200 MHz - Validates suitability for narrowband RF preamps and IF amplifiers below 100 MHz.

Pinout & Package

BC447G is housed in a Pb-free TO-92 package (Case 29, Style 17), with standardized lead spacing and mechanical dimensions compliant with ANSI Y14.5M. The package supports through-hole mounting and manual soldering per IPC-J-STD-020 MSL Level 1.

Pin/Terminal	Circuit Role	Design Meaning
1	Collector	Main current sink terminal; connects to load or supply rail in common-emitter configurations.
2	Base	Control input node; requires current-limited drive (typically 1–10 mA) to achieve saturation.
3	Emitter	Current source reference terminal; tied to ground or negative rail in most switching topologies.

Key Features

Feature	Design Value
High V_CEO rating	80 V enables use in 48 V telecom interfaces and industrial PLC I/O modules without derating.
Pb-free TO-92 packaging	Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 MSL Level 1 for moisture-safe assembly.
Wide h_FE range	50–460 allows single-BOM flexibility across gain-sensitive and gain-tolerant circuit variants.
Low V_CE(sat)	0.125–0.25 V reduces power loss in high-repetition switching (e.g., PWM dimming, relay drivers).

Applications

Industrial Sensor Interface	Consumer Audio Preamp
Use Scenario: Amplifying low-level analog signals from RTD or thermistor bridges in programmable logic controllers. IC Role / Device Role / Timing Role: Linear amplifier in common-emitter configuration with emitter degeneration for DC stability. Use Value: h_FE ≥ 50 at 2 mA ensures sufficient open-loop gain for 20–40 dB signal conditioning without op-amp complexity.	Use Scenario: Building discrete Class-A headphone driver stages in portable audio DACs. IC Role / Device Role / Timing Role: Voltage-controlled current source delivering low-distortion output into 16–32 Ω loads. Use Value: f_T ≥ 100 MHz and V_BE(on) ≤ 0.76 V support clean 20 kHz bandwidth and predictable bias point setting.
Power Supply Enable Switch	Microcontroller GPIO Expander
Use Scenario: Enabling/disabling auxiliary 5 V or 12 V rails in multi-rail embedded power supplies. IC Role / Device Role / Timing Role: Low-side saturated switch controlled directly by MCU GPIO pins. Use Value: V_CE(sat) ≤ 0.25 V limits dropout to <300 mV at 100 mA, preserving regulation margin.	Use Scenario: Driving higher-current peripherals (e.g., LED arrays, buzzers) from resource-constrained MCUs. IC Role / Device Role / Timing Role: Digital buffer with current gain, isolating MCU pins from load transients. Use Value: I_C = 300 mA rating supports 5–10× overdrive capability versus typical 20 mA GPIO limits.

Industrial Sensor Interface

Consumer Audio Preamp

Use Scenario: Amplifying low-level analog signals from RTD or thermistor bridges in programmable logic controllers.

IC Role / Device Role / Timing Role: Linear amplifier in common-emitter configuration with emitter degeneration for DC stability.

Use Value: h_FE ≥ 50 at 2 mA ensures sufficient open-loop gain for 20–40 dB signal conditioning without op-amp complexity.

Use Scenario: Building discrete Class-A headphone driver stages in portable audio DACs.

IC Role / Device Role / Timing Role: Voltage-controlled current source delivering low-distortion output into 16–32 Ω loads.

Use Value: f_T ≥ 100 MHz and V_BE(on) ≤ 0.76 V support clean 20 kHz bandwidth and predictable bias point setting.

Power Supply Enable Switch

Microcontroller GPIO Expander

Use Scenario: Enabling/disabling auxiliary 5 V or 12 V rails in multi-rail embedded power supplies.

IC Role / Device Role / Timing Role: Low-side saturated switch controlled directly by MCU GPIO pins.

Use Value: V_CE(sat) ≤ 0.25 V limits dropout to <300 mV at 100 mA, preserving regulation margin.

Use Scenario: Driving higher-current peripherals (e.g., LED arrays, buzzers) from resource-constrained MCUs.

IC Role / Device Role / Timing Role: Digital buffer with current gain, isolating MCU pins from load transients.

Use Value: I_C = 300 mA rating supports 5–10× overdrive capability versus typical 20 mA GPIO limits.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC547B	Same TO-92 package; h_FE min = 200 (vs. BC447G's 50), V_CEO = 45 V (vs. 80 V)	Limited to ≤36 V systems; preferred where tighter h_FE tolerance is required for precision biasing.	Select BC547B only when higher minimum gain and lower voltage rating are acceptable trade-offs.
MPSA18	V_CEO = 50 V, f_T = 300 MHz, TO-92 package, but I_C = 100 mA (vs. 300 mA)	Better high-frequency response but lower current handling; unsuitable for >100 mA switching loads.	Choose MPSA18 for RF amplifier stages above 100 MHz where current demand stays below 100 mA.

Compared with BC547B and MPSA18, BC447G uniquely balances high-voltage capability (80 V), robust current rating (300 mA), and wide h_FE range-making it optimal for industrial switching and general-purpose amplification where both breakdown margin and drive strength are critical.

Availability

BC447G is available at Aetrix Electronics and suitable for industrial sensor interfaces, consumer audio preamplifiers, and microcontroller GPIO expansion requiring stable component supply and long-term manufacturability.

Supply support for BC447G 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 BC447G belongs to onsemi's legacy high-voltage NPN transistor family designed for reliability-critical discrete amplification and switching in industrial control, instrumentation, and consumer electronics.

FAQ

What is the maximum collector-emitter voltage rating for BC447G?

The BC447G has a guaranteed minimum V_CEO rating of 80 Vdc under specified test conditions (I_C = 1.0 mA, I_B = 0). This rating applies across the full operating temperature range of −55°C to +150°C and defines the absolute maximum voltage the device can withstand between collector and emitter with the base open before breakdown occurs. Exceeding this value risks permanent damage to the BC447G.

Is BC447G RoHS-compliant and what does the 'G' suffix indicate?

Yes, BC447G is RoHS-compliant and Pb-free. The 'G' suffix explicitly denotes the Pb-free version packaged in TO-92 (Case 29, Style 17), conforming to JEDEC J-STD-020 MSL Level 1. This distinguishes it from non-Pb-free variants like BC447 and confirms compliance with environmental directives including EU RoHS 2011/65/EU and China RoHS.

What is the typical DC current gain (h_FE) of BC447G at 2 mA collector current?

The BC447G exhibits a typical h_FE of 220 at I_C = 2.0 mA and V_CE = 5.0 Vdc, with a guaranteed minimum of 50 and maximum of 460 under those same conditions. This wide spread accommodates process variation and allows designers to select appropriate base resistors for either conservative or aggressive biasing depending on application requirements.

Can BC447G be used in RF amplifier applications?

Yes, BC447G supports RF amplifier use up to approximately 100 MHz due to its f_T (current-gain bandwidth product) of 100–200 MHz measured at I_C = 50 mA and V_CE = 5.0 Vdc. It is suitable for VHF preamplifier and IF amplifier stages where moderate gain and linearity are required, though not intended for high-efficiency power RF transmission.

What thermal resistance values apply to BC447G in its TO-92 package?

The BC447G has a junction-to-ambient thermal resistance (R_JA) of 200 °C/W and a junction-to-case thermal resistance (R_JC) of 83.3 °C/W, both specified at T_A = 25°C. These values define the steady-state temperature rise per watt of dissipated power and inform heatsinking decisions-especially important when operating near its 625 mW ambient-rated power limit.

BC447G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 300 mA

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 10mA, 100mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 2mA, 5V

Power - Max:: 625 mW

Frequency - Transition:: 200MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

BC447G FAQ

1.How can I place an order for BC447G through Aetrix?

Please submit a Request for Quotation (RFQ) for BC447G 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 BC447G reliable?

The price and inventory of BC447G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC447G is usually 5 days.

3.What payment methods are accepted for BC447G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC447G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC447G?

BC447G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC447G 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 BC447G?

For technical support, including BC447G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC447G requirements.

6.How does Aetrix verify that BC447G is sourced from the original manufacturer or authorized distributors?

All BC447G 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 BC447G meets industry standards.

7.What is the process for return or replacement of BC447G?

All BC447G units undergo pre-shipment inspection (PSI). If there is an issue with BC447G, 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 BC447G part is unused and in its original packaging.

Return procedure for BC447G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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