Skip to main content

We use cookies to understand how you use our site and improve your experience. See our Privacy Policy.

BC548

NPN Silicon Amplifier Transistor

The BC548 is a npn silicon amplifier transistor from onsemi. View the full BC548 datasheet below including key specifications, electrical characteristics.

BC548 shares its datasheet with BC546, whose page lists every part number it covers.

Official BC548 datasheet (PDF) — the source this page was extracted from.

Manufacturer

onsemi

Category

BJTs

Package

TO-92

BC548 Key Specifications

ParameterValue
PolarityNPN
Noise Figure (NF)2.0 dB typ, 10 dB max
DC Current Gain (HFE)110 to 800 (IC=2.0mA, VCE=5.0V; varies by gain group)
Output Capacitance (Cobo)1.7 pF typ, 4.5 pF max
Collector Cutoff Current (ICES)15 nA max (VCE=35V, VBE=0)
Base-Emitter On Voltage (VBE(On))0.55V to 0.7V (IC=2.0mA, VCE=5.0V)
Current-Gain-Bandwidth Product (FT)150 MHz min, 300 MHz typ (IC=10mA, VCE=5V)
Emitter-Base Breakdown Voltage (V(BR)EBO)6.0V min
Collector-Base Breakdown Voltage (V(BR)CBO)30V min (BC548)
Collector-Emitter Breakdown Voltage (V(BR)CEO)30V min (BC548)
Collector-Emitter Saturation Voltage (VCE(Sat))0.25V max (IC=10mA, IB=0.5mA)

BC548 Overview

Part: BC546B, BC547A/B/C, BC548B/C — onsemi

Type: NPN Silicon Amplifier Transistors

Description: NPN silicon bipolar amplifier transistors in a TO-92 package with collector-emitter breakdown voltages ranging from 30 V to 65 V and a transition frequency of up to 300 MHz.

Key Specs:

  • Collector-emitter breakdown voltage V(BR)CEO (IC = 1.0 mA, IB = 0): 65 V min (BC546), 45 V min (BC547), 30 V min (BC548)
  • Collector-base breakdown voltage V(BR)CBO (IC = 100 μAdc): 80 V min (BC546), 50 V min (BC547), 30 V min (BC548)
  • Emitter-base breakdown voltage V(BR)EBO (IE = 10 μA, IC = 0): 6.0 V min
  • Collector cutoff current ICES (VCE = 30 V, TA = 125 °C): 4.0 μA max
  • DC current gain hFE (IC = 2.0 mA, VCE = 5.0 V): 110–220 (BC547A), 200–450 (BC546B/547B/548B), 420–800 (BC547C/BC548C)
  • Collector-emitter saturation voltage VCE(sat) (IC = 10 mA, IB = 0.5 mA): 0.09 V typ, 0.25 V max
  • Current-gain–bandwidth product fT (IC = 10 mA, VCE = 5.0 V, f = 100 MHz): 150 MHz min, 300 MHz typ
  • Output capacitance Cobo (VCB = 10 V, IC = 0, f = 1.0 MHz): 1.7 pF typ, 4.5 pF max
  • Noise figure NF (IC = 0.2 mA, VCE = 5.0 V, RS = 2 kΩ, f = 1.0 kHz, Δf = 200 Hz): 2.0 dB typ, 10 dB max

Features:

  • Pb-Free packages available

Applications:

  • General-purpose amplification

Package:

  • TO-92 (TO-226)

BC548 Features

  • Pb -Free Packages are Available*

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected.

*For additional information on our Pb -Free strategy and soldering details, please download the onsemi Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.

BC548 Electrical Characteristics

CharacteristicSymbolMinTypMaxUnit
OFF CHARACTERISTICS
Collector - Emitter Breakdown Voltage (I C = 1.0 mA, I B = 0)BC546 BC547 BC548 V (BR)CEO65 45 30- - -- - -V
Collector - Base Breakdown Voltage (I C = 100 m Adc)BC546 BC547 BC548 V (BR)CBO80 50 30- - -- - -V
Emitter - Base Breakdown Voltage (I E = 10 m A, I C = 0)BC546 BC547 BC548 V (BR)EBO6.0 6.0 6.0- - -- - -V
Collector Cutoff Current (V CE = 70 V, V BE = 0) (V CE = 50 V, V BE = 0) (V CE = 35 V, V BE = 0) (V CE = 30 V, T A = 125 ° C)BC546 BC547 BC548 BC546/547/548 I CES- - - -0.2 0.2 0.2 -15 15 15 4.0nA m A
ON CHARACTERISTICS
DC Current Gain (I C = 10 m A, V CE = 5.0 V) (I C = 2.0 mA, V CE = 5.0 V) (I C = 100 mA, V CE = 5.0 V)BC547A BC546B/547B/548B BC548C BC546 BC547 BC548 BC547A BC546B/547B/548B BC547C/BC548C BC547A/548A BC546B/547B/548B BC548C h FE- - - 110 110 110 110 200 420 - - -90 150 270 - - - 180 290 520 120 180 300- - - 450 800 800 220 450 800 - - --
Collector - Emitter Saturation Voltage (I C = 10 mA, I B = 0.5 mA) (I C = 100 mA, I B = 5.0 mA) (I C = 10 mA, I B = See Note 1)V CE(sat)- - -0.09 0.2 0.30.25 0.6 0.6V
Base - Emitter Saturation Voltage (I C = 10 mA, I B = 0.5 mA)V BE(sat)-0.7-V
Base - Emitter On Voltage (I C = 2.0 mA, V CE = 5.0 V)V BE(on)0.55- -0.7 0.77V
(I C = 10 mA, V CE = 5.0 V)-300 300-
SMALL - SIGNAL CHARACTERISTICS
Current - Gain - Bandwidth Product (I C = 10 mA, V CE = 5.0 V, f = 100 MHz)BC546 BC547 BC548 f T150 150 150300- -MHz
Output Capacitance (V CB = 10 V, I C = 0, f = 1.0 MHz)C obo-1.74.5pF
Input Capacitance (V EB = 0.5 V, I C = 0, f = 1.0 MHz)C ibo-10-pF
Small - Signal Current Gain (I C = 2.0 mA, V CE = 5.0 V, f = 1.0 kHz) BC546 BC547/548 BC547ABC546B/547B/548B BC547C/548C h fe125 125 125 240 450- - 220 330 600500 900 260 500 900-
Noise Figure (I C = 0.2 mA, V CE = 5.0 V, R S = 2 k W , f = 1.0 kHz, D f = 200 Hz) BC546 BC547BC548 NF- - -2.0 2.0 2.010 10 10dB

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part NumberManufacturerPackage
BC546onsemiTO-92
BC547onsemiTO-92

Other BJTs

  • DTC114ECA – GOODWORK, NPN Digital Transistor with Bias Resistors
  • BC847 – onsemi, NPN General-Purpose Transistor
  • 2N2219A – onsemi, NPN High Speed Switching Transistor
  • 2N2222 – onsemi, NPN Silicon Amplifier Transistor
  • 2N2222A – onsemi, NPN High Speed Switching Transistor
  • 2N3906 – onsemi, PNP Silicon General Purpose Transistor
  • 2N4921G – onsemi, NPN Medium-Power Silicon Transistor
  • 2N4922G – onsemi, Medium-Power NPN Silicon Transistor

All BJTs datasheetsAll onsemi datasheets (337)

Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.

Ask your AI agent about the BC548

Connect SheetsData to Claude, Cursor, Codex or any MCP client and your agent reads this datasheet for you: pinout, limits, register maps and design checks, with the numbers taken from the PDF.

claude mcp add --transport http sheetsdata https://mcp.sheetsdata.com/mcp

Then ask: "Can the BC548 run from my 12 V rail? Check it against the datasheet limits."

Create a free account $2 of usage every month, no card needed.