onsemi BC547BRL1G

Overview

BC547BRL1G from onsemi is an NPN silicon general-purpose amplifier transistor in TO-92 package, rated for 45 V_CEO, 100 mA continuous collector current, and DC current gain (h_FE) of 200–450 at I_C = 2 mA, used in low-power linear amplification and switching circuits in consumer electronics and industrial signal conditioning.

For engineers reviewing the BC547BRL1G datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO rating, h_FE range at operating bias, saturation voltage at defined I_C/I_B, thermal resistance, and Pb-free tape-and-reel packaging compliance for automated assembly.

Technical Context

The BC547BRL1G operates as a discrete bipolar junction transistor with fixed NPN polarity, optimized for medium-gain analog amplification and digital switching. Its h_FE binning (B-grade) guarantees minimum 200 and typical 290 at I_C = 2 mA, V_CE = 5 V, and its f_T of 300 MHz supports audio-frequency and low-speed digital signal handling.

Thermal design is constrained by R_JA = 200 °C/W (free-air) and R_JC = 83.3 °C/W, requiring careful PCB copper area allocation for power dissipation up to 625 mW at 25°C ambient. The device features V_BE(sat) ≤ 0.7 V and V_CE(sat) ≤ 0.25 V at I_C = 10 mA / I_B = 0.5 mA, enabling efficient low-voltage switching.

Key Specifications

Pinout & Package

BC547BRL1G uses the TO-92 (Case 29, Style 17) through-hole plastic package with bent leads and Pb-free finish. Dimensions: 4.45–5.20 mm (L) × 4.32–5.33 mm (W) × 3.18–4.19 mm (H). Lead pitch: 2.54 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC547CRL1G and MMBT3904LT1G, the BC547BRL1G offers balanced gain, proven reliability in legacy through-hole designs, and direct compatibility with existing TO-92 tooling and repair workflows-making it optimal for cost-sensitive, medium-volume industrial controls and educational kits.

Availability

BC547BRL1G is available at Aetrix Electronics and suitable for audio pre-amplifiers, microcontroller interface circuits, temperature sensor signal conditioning, and low-voltage power rail enable functions requiring stable component supply, long-term obsolescence management, and RoHS-compliant manufacturing.

Supply support for BC547BRL1G 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 IoT applications.

The BC547BRL1G belongs to onsemi's legacy general-purpose bipolar transistor family, designed for broad utility in discrete analog and digital circuit building blocks-emphasizing manufacturability, consistency, and long-lifecycle support across decades of electronics design.

FAQ

What is the maximum collector-emitter voltage rating for BC547BRL1G?

The BC547BRL1G has a maximum collector-emitter voltage (V_CEO) rating of 45 V DC. This value is tested and guaranteed per onsemi's datasheet under standard conditions (I_C = 1.0 mA, I_B = 0). Exceeding 45 V risks avalanche breakdown and permanent device failure. Designers should maintain at least 20% derating margin (i.e., ≤36 V) in safety-critical or high-temperature applications. The BC547BRL1G datasheet confirms this rating on page 1 under Maximum Ratings.

Does BC547BRL1G support lead-free soldering processes?

Yes, BC547BRL1G is explicitly marked as Pb-free in onsemi's ordering information and carries the "G" suffix per industry convention. It complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and is qualified for lead-free reflow profiles up to 260°C peak temperature. The device uses matte tin plating on leads and meets RoHS Directive 2011/65/EU. Full process guidelines are detailed in onsemi's Soldering and Mounting Techniques Reference Manual (SOLDERRM/D).

What is the DC current gain (h_FE) range for BC547BRL1G at 2 mA collector current?

The BC547BRL1G has a guaranteed h_FE range of 200 to 450 when measured at I_C = 2.0 mA, V_CE = 5.0 V, and T_A = 25°C. This bin "B" specification is confirmed in the Electrical Characteristics table on page 2 of the BC546B/BC547A,B,C/BC548B,C datasheet. Typical h_FE is 290 under those conditions, making BC547BRL1G suitable for designs requiring predictable, medium-gain amplification without excessive base drive.

Can BC547BRL1G be used in switching applications, and what is its saturation voltage?

Yes, BC547BRL1G is widely used in low-speed switching applications. Its collector-emitter saturation voltage (V_CE(sat)) is specified as ≤0.25 V at I_C = 10 mA and I_B = 0.5 mA, and ≤0.6 V at I_C = 100 mA and I_B = 5.0 mA. These values ensure low conduction losses-e.g., <2.5 mW at 10 mA-making BC547BRL1G effective for driving LEDs, relays, and logic-level MOSFET gates in battery-powered or thermally constrained systems.

What package type and orientation does BC547BRL1G use, and how are its pins numbered?

BC547BRL1G uses the TO-92 (Case 29, Style 17) package with bent leads and Pb-free finish. When viewing the flat side of the package with leads pointing downward, pin 1 is Collector, pin 2 is Base, and pin 3 is Emitter-per the mechanical drawing on page 5 of the datasheet. This pinout is standardized across onsemi's BC546–BC548 series and differs from Style 1 (E-B-C) or Style 2 (B-E-C); correct orientation is essential to avoid circuit malfunction.