Product Overview
Motorola 2N4403 PNP Small Signal Transistor in TO-92 - 40V, 625 mW, Unused Stock
Condition
New, unused stock. The photographed piece is a black plastic TO-92 case with the flat face marked 2N4403 over the Motorola M logo and the code 317 below it. All three leads are straight, full length, and bright with no bends, kinks, corrosion, or solder on them, and the case shows no chips or scuffs. The second photograph is the plain rounded back of the case, which carries only the molded circular tooling mark and no printing. The two photographs were taken under different lighting, so the same case reads matte grey in one and gloss black in the other. The photographed piece is one representative example; the photographs are the spec for the piece shown, and markings such as the date code can vary from piece to piece.
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Product Overview
The 2N4403 is a PNP bipolar junction transistor built for general purpose amplifier and switching work, rated 40V with 625 mW of power dissipation, in the three-lead TO-92 plastic package that has been the standard small signal footprint on through-hole boards for decades. It is the PNP half of the long-running 2N4401 and 2N4403 complementary pair, so it sits on the high side of a load, sinks a relay or lamp driver from a positive rail, or forms the pull-up leg of a discrete push-pull stage. These are Motorola parts, marked as such on the case, from the era when Motorola's discrete semiconductor line was standard issue in industrial control, instrumentation, and consumer audio. Sold each, so you can buy the count your board actually calls for.
Key Features
- Device type: PNP bipolar junction transistor (BJT)
- Part number: 2N4403, marked on the case
- Manufacturer: Motorola, M logo on the case face
- Voltage: 40V
- Power dissipation: 625 mW
- Package: TO-92 plastic, three straight radial leads
- Intended use: general purpose amplifier and switching applications
- Condition: new and unused, leads bright and untrimmed
- Sold each, 26 pieces on the shelf at the time of listing
- Full electrical characteristics not confirmed here - verify against the 2N4403 datasheet before use
Applications
- Bench technician repairing a 1980s control board and needing an original-marked Motorola PNP rather than a modern substitute
- Audio hobbyist building a discrete preamp or headphone stage where the 2N4401 and 2N4403 pair is called out in the schematic
- Prototyper on a breadboard driving a small relay, LED string, or buzzer from the high side of a positive rail
- Instructor stocking a teaching kit that needs a plain, well-documented PNP for transistor switching labs
Frequently Asked Questions
Are these tested, or sold on the markings?
They are sold as new unused stock on the strength of the case markings and a visual check of the leads and body. We do not curve-trace every piece. What you see in the photographs - clean case, clear 2N4403 marking, straight bright leads - is what we are representing.
Will the piece I receive carry the same 317 code as the photograph?
Not necessarily. The photographs show one representative piece from the shelf, and they are the spec for that piece only - we cannot promise an unphotographed piece carries identical markings, including the date or trace code. If you need a specific code for a matched set or a restoration, ask before ordering.
Is this the PNP that goes with a 2N4401?
Yes, the 2N4403 is the PNP complement commonly paired with the NPN 2N4401 in complementary designs. Pinout and full electrical parameters are not confirmed by us - check the 2N4403 datasheet against your schematic before you commit a board.
Can I use it in place of a 2N3906 or another small signal PNP?
Often, but that is your call to make against the datasheet. The 2N4403 carries a higher current rating than the common 2N3906 family, so it is usually the more capable substitution rather than the other way round. Compare the parameters your circuit depends on before swapping.
Why buy four or ten of these here instead of a bag of 100 somewhere else?
Because most repairs need three pieces, not a hundred. We sell these each, so you buy the count your board calls for and skip the forced lot that sits in a drawer for the next ten years. Shipping is $8 flat rate and free once your order passes $28, so a handful of small parts still comes in under what a bulk lot costs, and orders leave our Idaho warehouse the same or next business day.
Somewhere in a cabinet built in the Reagan years, a PNP just like this one has been quietly turning a relay on and off since before its owner was born. Pull the dead one, put this one in, and let the machine go back to being boring.
