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

onsemi BC547BRL1

Name: BC547BRL1
Brand: onsemi
SKU: BC547BRL1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC547BRL1

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BC547BRL1.pdf

Description:: TRANS NPN 45V 0.1A TO92

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC547BRL1 from ON Semiconductor is an NPN silicon general-purpose amplifier transistor in TO-92 package, rated for V_CEO = 45 V, I_C = 100 mA, and h_FE = 200–450 (at I_C = 2 mA, V_CE = 5 V). It delivers low V_CE(sat) = 0.25 V (at I_C = 10 mA, I_B = 0.5 mA) and f_T = 300 MHz, enabling use in audio preamplifiers, signal switching, and low-power linear amplification stages.

For engineers reviewing the BC547BRL1 datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, TO-92 terminal mapping, real-world use cases in analog signal conditioning and discrete logic interfacing, and two validated alternative transistors with documented gain and voltage rating differences.

Technical Context

The BC547BRL1 operates as a medium-gain, medium-speed NPN bipolar junction transistor optimized for linear amplification and saturated switching. Its DC current gain (h_FE) is binned to 200–450 at 2 mA collector current, and its f_T of 300 MHz supports stable small-signal amplification up to mid-VHF frequencies. Thermal resistance R_JA is 200 °C/W, limiting continuous power dissipation to 625 mW at 25°C ambient.

It features V_(BR)CEO = 45 V, V_(BR)CBO = 50 V, and V_(BR)EBO = 6.0 V - defining safe operating limits for common-emitter, common-base, and common-collector configurations. Saturation behavior is characterized at I_C/I_B = 10, with V_CE(sat) ≤ 0.25 V and V_BE(sat) ≈ 0.7 V, supporting reliable digital interface and relay driver designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	45 V - Maximum collector-emitter voltage before breakdown; sets upper rail limit in single-supply amplifier stages.
I_C (continuous)	100 mA - Absolute max collector current; defines load drive capability in switching applications.
h_FE (min–max)	200–450 at I_C = 2 mA - Gain binning ensures predictable bias stability in emitter-follower and CE amplifier designs.
f_T	300 MHz - Unity-gain bandwidth; enables faithful amplification of audio and low-speed digital signals without phase distortion.
V_CE(sat)	0.25 V @ I_C = 10 mA, I_B = 0.5 mA - Low saturation voltage minimizes power loss and heat generation in switch-mode operation.
R_JA	200 °C/W - Junction-to-ambient thermal resistance; requires heatsinking or derating above 25°C ambient for sustained 625 mW operation.

Pinout & Package

BC547BRL1 uses the industry-standard TO-92 (Case 29, Style 17) through-hole plastic package, with 3 leads and a maximum height of 5.20 mm. Pin 1 is Collector, Pin 2 is Base, Pin 3 is Emitter - confirmed by ON Semiconductor marking diagram and ordering information.

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Main current output terminal	Connected to load or supply rail; carries full collector current; voltage swing limited by V_CEO = 45 V.
2 (Base)	Control input terminal	Receives bias current to regulate collector current; requires series resistor to limit I_B and prevent thermal runaway.
3 (Emitter)	Current return path	Typically grounded or connected to emitter resistor; establishes reference for V_BE and sets operating point.

Key Features

Feature	Design Value
Pb-free TO-92 packaging	Complies with RoHS Directive 2011/65/EU; suitable for lead-free reflow and wave soldering processes.
Gain binning (B grade)	h_FE = 200–450 ensures consistent DC bias performance across production lots in amplifier circuits.
Low noise figure	NF = 2.0 dB @ I_C = 0.2 mA, f = 1 kHz - supports high-SNR preamplifier stages in sensor interfaces.
High f_T / low C_obo	f_T = 300 MHz with C_obo = 1.7 pF enables wideband small-signal amplification with minimal capacitive loading.

Applications

Audio Preamplifier Stage	Microcontroller GPIO Interface
Use Scenario: Amplifying weak microphone or piezoelectric sensor signals prior to ADC sampling in portable audio devices. IC Role / Device Role / Timing Role: NPN common-emitter amplifier with fixed bias or emitter-degeneration configuration. Use Value: h_FE = 200–450 and NF = 2.0 dB ensure sufficient gain and low-noise signal integrity at 1–10 kHz audio band.	Use Scenario: Level-shifting and current boosting between 3.3 V microcontroller outputs and 5 V/12 V peripheral loads (e.g., relays, LEDs). IC Role / Device Role / Timing Role: Saturated NPN switch controlled by MCU GPIO pin via base resistor. Use Value: V_CE(sat) ≤ 0.25 V and I_C = 100 mA enable efficient on-state drive with <100 mW dissipation per switch.
Linear Voltage Regulator Pass Element	Discrete Logic Inverter
Use Scenario: Acting as pass transistor in adjustable linear regulators (e.g., LM317-based circuits) delivering up to 100 mA load current. IC Role / Device Role / Timing Role: Emitter-follower configured pass device with feedback-controlled base voltage. Use Value: V_CEO = 45 V and R_JA = 200 °C/W allow safe operation with 10–20 V dropout at ambient temperatures ≤ 60°C.	Use Scenario: Constructing non-inverting or inverting logic gates in educational kits or legacy TTL-compatible systems. IC Role / Device Role / Timing Role: Single-transistor saturated switch implementing NOT function with pull-up resistor. Use Value: Fast turn-on/turn-off (enabled by f_T = 300 MHz) and low V_CE(sat) support clean digital transitions up to ~1 MHz.

Audio Preamplifier Stage

Microcontroller GPIO Interface

Use Scenario: Amplifying weak microphone or piezoelectric sensor signals prior to ADC sampling in portable audio devices.

IC Role / Device Role / Timing Role: NPN common-emitter amplifier with fixed bias or emitter-degeneration configuration.

Use Value: h_FE = 200–450 and NF = 2.0 dB ensure sufficient gain and low-noise signal integrity at 1–10 kHz audio band.

Use Scenario: Level-shifting and current boosting between 3.3 V microcontroller outputs and 5 V/12 V peripheral loads (e.g., relays, LEDs).

IC Role / Device Role / Timing Role: Saturated NPN switch controlled by MCU GPIO pin via base resistor.

Use Value: V_CE(sat) ≤ 0.25 V and I_C = 100 mA enable efficient on-state drive with <100 mW dissipation per switch.

Linear Voltage Regulator Pass Element

Discrete Logic Inverter

Use Scenario: Acting as pass transistor in adjustable linear regulators (e.g., LM317-based circuits) delivering up to 100 mA load current.

IC Role / Device Role / Timing Role: Emitter-follower configured pass device with feedback-controlled base voltage.

Use Value: V_CEO = 45 V and R_JA = 200 °C/W allow safe operation with 10–20 V dropout at ambient temperatures ≤ 60°C.

Use Scenario: Constructing non-inverting or inverting logic gates in educational kits or legacy TTL-compatible systems.

IC Role / Device Role / Timing Role: Single-transistor saturated switch implementing NOT function with pull-up resistor.

Use Value: Fast turn-on/turn-off (enabled by f_T = 300 MHz) and low V_CE(sat) support clean digital transitions up to ~1 MHz.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC547CRL1	Higher h_FE bin: 420–800 (vs. BC547BRL1's 200–450); identical V_CEO, I_C, and package.	Better suited for high-gain, low-input-current amplifier stages where bias stability is critical.	Select BC547CRL1 when circuit requires >400 h_FE minimum; avoid if gain variability must be minimized.
2N3904RLRPG	V_CEO = 40 V (vs. 45 V); h_FE = 100–300; same TO-92 package and pinout.	Slightly lower voltage margin and gain range; widely available but less optimized for low-noise audio.	Use 2N3904RLRPG where cost or stock availability outweighs need for 45 V rating or 2 dB NF advantage.

Compared with BC547CRL1 and 2N3904RLRPG, the BC547BRL1 offers balanced gain (200–450), superior voltage margin (45 V), and lowest noise (2.0 dB), making it optimal for precision analog front-ends where gain consistency and SNR are prioritized over maximum h_FE.

Availability

BC547BRL1 is available at Aetrix Electronics and suitable for audio preamplifiers, microcontroller interface circuits, and discrete linear regulator designs requiring stable component supply, consistent gain binning, and RoHS-compliant packaging.

Supply support for BC547BRL1 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

ON Semiconductor (now part of onsemi) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, and consumer markets.

The BC547BRL1 belongs to the BC546/547/548 family of general-purpose NPN transistors designed for cost-sensitive, high-reliability linear amplification and switching in commercial and industrial equipment.

FAQ

What is the maximum collector-emitter voltage rating for BC547BRL1?

The BC547BRL1 has a maximum collector-emitter voltage (V_CEO) rating of 45 V DC. This value is specified under test conditions of I_C = 1.0 mA and I_B = 0, and represents the absolute maximum voltage that can be applied between collector and emitter before breakdown occurs. Exceeding this rating risks permanent device damage.

What is the h_FE range for BC547BRL1 and how is it tested?

The BC547BRL1 is binned to an h_FE range of 200–450, measured at I_C = 2.0 mA and V_CE = 5.0 V, per ON Semiconductor's BC546/D datasheet Rev. 5. This gain range is guaranteed across the production lot and reflects the "B" suffix grade within the BC547 family, ensuring predictable DC bias behavior in amplifier and switching circuits.

Is BC547BRL1 RoHS-compliant and what does the 'G' suffix indicate?

Yes, BC547BRL1 is RoHS-compliant. The "G" suffix (e.g., BC547BRL1G) explicitly denotes the Pb-free version; however, BC547BRL1 itself is also manufactured to meet RoHS requirements per ON Semiconductor's Pb-Free Packaging documentation. Both variants use matte tin lead plating and comply with Directive 2011/65/EU.

What is the thermal resistance (R_JA) of BC547BRL1 and how does it affect power handling?

The BC547BRL1 has a junction-to-ambient thermal resistance (R_JA) of 200 °C/W. At 25°C ambient, its maximum power dissipation is 625 mW; above that temperature, power must be linearly derated by 5.0 mW/°C. This means at 75°C ambient, usable power drops to 375 mW - a critical constraint in enclosed or high-temperature environments.

Does BC547BRL1 have the same pinout as BC547B and other TO-92 NPN transistors?

Yes, BC547BRL1 uses the standard TO-92 Style 17 pinout: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter - identical to BC547B, BC547C, and most legacy NPN TO-92 transistors including 2N3904. This pin compatibility allows direct substitution in existing PCB layouts without modification, provided voltage, gain, and thermal requirements are met.

BC547BRL1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 500µA, 10mA

Current - Collector Cutoff (Max):: 15nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 2mA, 5V

Power - Max:: 625 mW

Frequency - Transition:: 300MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

BC547BRL1 FAQ

1.How can I place an order for BC547BRL1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC547BRL1 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 BC547BRL1 reliable?

The price and inventory of BC547BRL1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC547BRL1 is usually 5 days.

3.What payment methods are accepted for BC547BRL1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC547BRL1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC547BRL1?

BC547BRL1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC547BRL1 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 BC547BRL1?

For technical support, including BC547BRL1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC547BRL1 requirements.

6.How does Aetrix verify that BC547BRL1 is sourced from the original manufacturer or authorized distributors?

All BC547BRL1 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 BC547BRL1 meets industry standards.

7.What is the process for return or replacement of BC547BRL1?

All BC547BRL1 units undergo pre-shipment inspection (PSI). If there is an issue with BC547BRL1, 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 BC547BRL1 part is unused and in its original packaging.

Return procedure for BC547BRL1:

1.Submit a request within 90 days.

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

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