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 Transistor Configuration Maximum Collector Base Voltage Maximum Emitter Base Voltage Maximum Operating Frequency Pin Count Number of Elements per Chip Dimensions Maximum Base Emitter Saturation Voltage
RS Stock No. 146-2331
Mfr. Part No.BC338-25 A1
PHP1.684
Each (On a Tape of 4000)
units
NPN 800 mA 25 V TO-92 Through Hole 625 mW Single 30 V 5 V - 3 1 5.1 x 4.1 x 4.7mm -
RS Stock No. 170-8033
Mfr. Part No.BCX54-16,135
BrandNexperia
PHP3.126
Each (On a Reel of 4000)
units
NPN 1 A 45 V SOT-89 Surface Mount 1.35 W Single 45 V 5 V 180 MHz 3 + Tab 1 4.6 x 2.6 x 1.6mm -
RS Stock No. 166-0432
Mfr. Part No.PBSS9110T,215
BrandNexperia
PHP3.78
Each (On a Reel of 3000)
units
PNP 1 A 100 V SOT-23 (TO-236AB) Surface Mount 480 mW Single 120 V 5 V 100 MHz 3 1 1 x 3 x 1.4mm 1.1 V
RS Stock No. 122-2371
Mfr. Part No.MMBT2222AT-7-F
PHP2.99
Each (On a Reel of 3000)
units
NPN 600 mA 40 V SOT-523 (SC-89) Surface Mount 150 mW Single 75 V 6 V 300 MHz 3 1 1.7 x 0.85 x 0.8mm 2 V
RS Stock No. 165-8567
Mfr. Part No.BSR41
BrandNexperia
PHP11.809
Each (On a Reel of 1000)
units
NPN 1 A 60 V SOT-89 Surface Mount 1.35 W Single 70 V 5 V 100 MHz 3 1 4.6 x 2.6 x 1.6mm 1.2 V
RS Stock No. 166-0084
Mfr. Part No.BF820,215
BrandNexperia
PHP3.634
Each (On a Reel of 3000)
units
NPN 50 mA 300 V SOT-23 Surface Mount 250 mW Single 300 V 5 V - 3 1 3 x 1.4 x 1mm -
RS Stock No. 179-1099
Mfr. Part No.BCW60B,215
BrandNexperia
PHP1.94
Each (On a Reel of 3000)
units
NPN 100 mA 32 V SOT-23 Surface Mount 250 mW Single 32 V 5 V - 3 1 3 x 1.4 x 1mm 1.05 V
RS Stock No. 823-1482
Mfr. Part No.MMDT2222A-7-F
PHP15.17
Each (In a Pack of 50)
units
NPN 600 mA 40 V SOT-363 (SC-88) Surface Mount 200 mW Isolated 75 V 6 V 300 MHz 6 2 2.2 x 1.35 x 1mm 2 V
RS Stock No. 790-5476
Mfr. Part No.NSS60600MZ4T1G
PHP23.84
Each (In a Pack of 20)
units
PNP 6 A 60 V SOT-223 Surface Mount 800 mW Single -100 V dc -6 V 1 MHz 3 + Tab 1 6.7 x 3.7 x 1.65mm -1 V
RS Stock No. 790-5498
Mfr. Part No.TIP41BG
PHP24.077
Each (In a Pack of 10)
units
NPN 6 A 80 V TO-220 Through Hole 65 W Single 80 V dc 5 V 1 MHz 3 1 10.28 x 4.82 x 15.75mm -
RS Stock No. 801-5609
Mfr. Part No.PBSS4021PT,215
BrandNexperia
PHP18.64
Each (In a Pack of 20)
units
PNP 3.5 A 20 V SOT-23 Surface Mount 1.1 W Single -20 V -5 V 100 MHz 3 1 3 x 1.4 x 1.1mm -1 V
RS Stock No. 774-0698
Mfr. Part No.2SB1216S-TL-E
PHP42.31
Each (On a Tape of 5)
units
PNP 4 A 100 V TP-FA Surface Mount 20 W Single -120 V -6 V 1 MHz 4 1 6.5 x 5.5 x 2.3mm -1.2 V
RS Stock No. 166-1431
Mfr. Part No.BCM857BS,115
BrandNexperia
PHP5.253
Each (On a Reel of 3000)
units
PNP 100 mA 45 V UMT Surface Mount 300 mW Isolated 50 V 5 V 175 MHz 6 2 1 x 2.2 x 1.35mm 0.92 V
RS Stock No. 857-8176
Mfr. Part No.BC848BL3E6327XTMA1
BrandInfineon
PHP3.389
Each (On a Reel of 15000)
units
NPN 100 mA 30 V TSLP Surface Mount 250 mW Single 30 V 6 V 250 MHz 3 1 1 x 0.6 x 0.35mm 900 mV
RS Stock No. 153-1976
Mfr. Part No.PHPT61006PYX
BrandNexperia
PHP26.62
Each (In a Pack of 25)
units
PNP -6 A -100 V LFPAK56, SOT669 Surface Mount 25 W Single -100 V -8 V 116 MHz 4 + Tab 1 5 x 4.1 x 1.05mm -1.25 V
RS Stock No. 121-9421
Mfr. Part No.FZT758TA
PHP18.962
Each (On a Reel of 1000)
units
PNP 500 mA 400 V SOT-223 Surface Mount 2 W Single 400 V 5 V 50 MHz 3 + Tab 1 1.65 x 6.7 x 3.7mm 0.9 V
RS Stock No. 669-7534
Mfr. Part No.FMMT620TA
PHP24.10
Each (In a Pack of 10)
units
NPN 1.5 A 80 V SOT-23 Surface Mount 806 mW Single 80 V 6 V 160 MHz 3 1 1 x 3.05 x 1.4mm 1 V
RS Stock No. 122-0656
Mfr. Part No.ZXTP25100BFHTA
PHP13.377
Each (On a Reel of 3000)
units
PNP 2 A 100 V SOT-23 Surface Mount 1.81 W Single -140 V -7 V 200 MHz 3 1 3.05 x 1.4 x 1mm -1 V
RS Stock No. 806-1347
Mfr. Part No.PZTA56
PHP15.59
Each (On a Tape of 50)
units
PNP 500 mA 80 V SOT-223 Surface Mount 1 W Single -80 V -4 V 100 MHz 3 + Tab 1 6.7 x 3.7 x 1.7mm -1.2 V
RS Stock No. 178-7143
Mfr. Part No.BCW72,215
BrandNexperia
PHP2.10
Each (On a Reel of 3000)
units
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