Product Overview
2N3903 NPN Small-Signal Transistor, TO-92, 40V 200mA General-Purpose Amplifier and Switch
Condition
Unused new old stock (NOS), made by Harris Semiconductor. Markings legible: Harris logo, 2N 3903, J 052. Leads straight and bright. Sold each.
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Product Overview
Harris 2N3903, a silicon NPN bipolar transistor built as a general-purpose amplifier and switch in the TO-92 plastic package. It is the lower-gain JEDEC grade beside the 2N3904.
Key Features
- Silicon NPN bipolar junction transistor, general-purpose amplifier and switch
- VCEO 40 V, VCBO 60 V, VEBO 6.0 V
- Collector current 200 mA continuous; power dissipation 625 mW
- DC current gain hFE 50 minimum at 10 mA (VCE 1 V)
- Transition frequency fT 250 MHz minimum
- TO-92 plastic package, three in-line leads, 19 mm overall length including leads
Applications
- Replacing a 2N3903 called out in a vintage board's parts list with a Harris-marked part of the same number
- Switching an LED, small relay or buzzer from a logic output within the 200 mA collector rating
- Building a small-signal audio or sensor preamp stage on the breadboard
Frequently Asked Questions
Is the 2N3903 NPN or PNP?
NPN. The PNP counterpart in the same general-purpose family is the 2N3905.
Can a 2N3903 stand in for a 2N3904?
They fill the same small-signal role, but the 2N3903 is the lower-gain grade: hFE 50 minimum at 10 mA, against 100 minimum for the 2N3904. A circuit that leans on high gain wants the 2N3904.
The square H logo belongs to Harris, a maker that no longer builds small-signal silicon, while the 2N3903 number it wears is still in production today. This one has never seen a circuit, and the next board that needs it is yours.
