BJT & Bipolar Transistors

A Bipolar Transistor or BJT (Bipolar Junction Transistor) is a solid state, three-pin device made from three layers of silicon. A BJT is designed to amplify current, bipolar transistors can also function as a switch. There are two main types of transistor, PNP (positive negative positive) or NPN (negative positive negative).
How a Bipolar transistor is made
A bipolar transistor is made by joining two signal diodes back to back creating two PN junctions connected in series, sharing a common P or N terminal. By nature, silicon does not normally conduct electricity well. However, when silicon is treated with certain chemicals or impurities we can make the material and electrons behave in a different way. This process is called doping. The doping process improves the semiconductors ability to conduct electricity.
What does a bipolar transistor do?
As we said before a bipolar transistor has two possible functions, switching, and amplification. Due to the devices three layers of doped semiconductor material, supplying the transistor with a signal voltage enables the discrete component to act as an insulator or a conductor. This clever change provides the transistors with two basic functions, switching (digital) electronics or amplification (analog) electronics.
Types of transistor
Transistors are available in panel, surface and through hole mounting options in plastic package or metal can versions. All have three terminals or pins, the Base, the Collector, and the Emitter.
Where are bipolar transistors used?
Transistors are one of the most widely used discrete components in electronic designs and circuits. Transistors are used for the amplification of all types of electrical signals in circuits made up of individual components rather than ICs (integrated circuits).

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Description Price Transistor Type Maximum DC Collector Current Maximum Collector Emitter Voltage Package Type Mounting Type Maximum Power Dissipation Minimum DC Current Gain Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Automotive Standard
RS庫存編號 146-2331
製造零件編號BC338-25 A1
HK$0.317
Each (On a Tape of 4000)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 160 Single 30 V 5 V - 3 1 -
RS庫存編號 796-9684
製造零件編號BC338-25 A1
HK$1.235
/個 (每包:250個)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 160 Single 30 V 5 V - 3 1 -
RS庫存編號 796-9681
製造零件編號BC338-16 A1
HK$1.15
/個 (每包:250個)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 100 Single 30 V 5 V - 3 1 -
RS庫存編號 170-4153
製造零件編號BC338-16 A1
HK$0.344
Each (On a Tape of 4000)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 100 Single 30 V 5 V - 3 1 -
RS庫存編號 796-9690
製造零件編號BC546B A1
HK$0.988
/個 (每包:250個)
單位
NPN 100 mA 65 V TO-92 Through Hole 500 mW 200 Single 80 V 6 V - 3 1 -
RS庫存編號 170-4155
製造零件編號BC546B A1
HK$0.30
Each (On a Tape of 4000)
單位
NPN 100 mA 65 V TO-92 Through Hole 500 mW 200 Single 80 V 6 V - 3 1 -
RS庫存編號 796-9672
製造零件編號BC337-40 A1
HK$1.15
/個 (每包:250個)
單位
NPN 800 mA 45 V TO-92 Through Hole 625 mW 250 Single 50 V 5 V - 3 1 -
RS庫存編號 146-2332
製造零件編號BC546C A1
HK$0.293
Each (On a Tape of 4000)
單位
NPN 100 mA 65 V TO-92 Through Hole 500 mW 420 Single 80 V 6 V - 3 1 -
RS庫存編號 170-4150
製造零件編號BC337-40 A1
HK$0.317
Each (On a Tape of 4000)
單位
NPN 800 mA 45 V TO-92 Through Hole 625 mW 250 Single 50 V 5 V - 3 1 -
RS庫存編號 796-9694
製造零件編號BC546C A1
HK$1.284
/個 (每包:250個)
單位
NPN 100 mA 65 V TO-92 Through Hole 500 mW 420 Single 80 V 6 V - 3 1 -
RS庫存編號 169-9291
製造零件編號BC847B RF
HK$0.252
個 (在毎卷:3000)
單位
NPN 100 mA 45 V SOT-23 Surface Mount 250 mW 200 Single 50 V 6 V 100 MHz 3 1 -
RS庫存編號 748-4991
製造零件編號BC847B RF
HK$0.48
/個 (每包:200個)
單位
NPN 100 mA 45 V SOT-23 Surface Mount 250 mW 200 Single 50 V 6 V 100 MHz 3 1 -
RS庫存編號 796-9678
製造零件編號BC337-25 A1
HK$1.15
/個 (每包:250個)
單位
NPN 800 mA 45 V TO-92 Through Hole 625 mW 160 Single 50 V 5 V - 3 1 -
RS庫存編號 170-4154
製造零件編號BC338-40 A1
HK$0.344
Each (On a Tape of 4000)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 250 Single 30 V 5 V - 3 1 -
RS庫存編號 796-9688
製造零件編號BC338-40 A1
HK$1.339
/個 (每包:250個)
單位
NPN 800 mA 25 V TO-92 Through Hole 625 mW 250 Single 30 V 5 V - 3 1 -
RS庫存編號 170-4152
製造零件編號BC337-25 A1
HK$0.317
Each (On a Tape of 4000)
單位
NPN 800 mA 45 V TO-92 Through Hole 625 mW 160 Single 50 V 5 V - 3 1 -
RS庫存編號 796-9754
製造零件編號BC807-40 RF
HK$1.093
/個 (每包:250個)
單位
PNP 500 mA 45 V SOT-23 Surface Mount 300 mW 250 Single - - - 3 1 -
RS庫存編號 796-9767
製造零件編號BC817-40 RFG
HK$1.08
/個 (每包:250個)
單位
NPN 500 mA 45 V SOT-23 Surface Mount 300 mW 100 Single 50 V 5 V - 3 1 -
RS庫存編號 796-9739
製造零件編號BC550C A1
HK$1.074
/個 (每包:250個)
單位
NPN 100 mA 45 V TO-92 Through Hole 500 mW 420 Single 50 V 6 V - 3 1 -
RS庫存編號 796-9713
製造零件編號BC548B A1
HK$0.988
/個 (每包:250個)
單位
NPN 100 mA 30 V TO-92 Through Hole 500 mW 200 Single 30 V 6 V - 3 1 -