Product Overview
National Semiconductor PN4250 PNP Small Signal Transistor, TO-92 Plastic Package
Condition
New. The photographed piece is a black three-lead TO-92 plastic package carrying National Semiconductor's script N logo, PN over 4250, and a factory code line reading 117 with a trailing slash. All three leads are straight, full length and unclipped, with no solder, no flux residue and no bend marks. Lead plating reads dull grey in both photos, which is how bare surplus semiconductor leads normally look after shelf time. Stock here is one piece, and these photos are the spec for that piece.
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Product Overview
The PN4250 is a PNP bipolar junction transistor in the three-lead TO-92 plastic package, intended for low level small signal work rather than power switching. Our listing records give it a 625 mW dissipation rating and an operating temperature range of -55 C to 150 C. The body of the photographed piece is marked PN4250 under National Semiconductor's script N, so the number on the part is the number to match when you are sourcing against an old schematic or a parts list that simply calls for a PN4250 and does not name a maker. Collector-emitter voltage, gain grouping and frequency figures are not confirmed here - verify those against the PN4250 datasheet before you design it in.
Key Features
- Device type: PNP bipolar junction transistor (BJT), low level
- Power dissipation: 625 mW per our listing records
- Operating temperature range: -55 C to 150 C per our listing records
- Package: TO-92 three-lead plastic, through-hole, confirmed from the photos
- Body markings: National Semiconductor script N logo, PN 4250, and a 117 factory code line
- Leads: three, straight, full length, unclipped, unsoldered
- Condition: New, one piece in stock, the exact piece shown in both photos
Applications
- Audio restorer rebuilding a 1970s or 1980s preamp stage whose parts list calls out a PN4250 by number
- Bench technician replacing a single failed PNP small signal driver on a discrete control board
- Hobbyist breadboarding a discrete PNP stage who wants one correct through-hole device instead of a mixed bag
- Restorer or archivist matching an original National Semiconductor device to a period-correct build
Frequently Asked Questions
What exactly is printed on this transistor?
Three things, all legible in the close-up photo: National Semiconductor's script N logo, the part number split across two lines as PN and 4250, and a third line reading 117 with a trailing slash. We read that last line as a factory code rather than part of the device number. The number you order and cross-reference is PN4250.
Which electrical ratings are actually confirmed?
Two, and both come from our own listing records rather than from a measurement here: 625 mW dissipation and an operating temperature range of -55 C to 150 C. Everything else a designer would want - collector-emitter and collector-base voltage, hFE gain group, transition frequency - is not confirmed by us. Check the PN4250 datasheet before committing it to a design.
What is the pinout?
Not confirmed on our side. TO-92 lead order is not universal across device families, and getting it wrong on a PNP small signal part is an easy way to lose an afternoon. Verify the pinout against the PN4250 datasheet with the flat marked face of the package oriented the way the sheet shows before you solder.
Is this the genuine National Semiconductor part or a second source?
The photographed piece carries National Semiconductor's script N mark on the body, so it is the National device. That statement covers the piece in these photos, which is also the only piece in stock.
Why buy this one photographed transistor instead of chasing a surplus lot?
Because you get this specific device: one in stock, both photos taken of it, markings readable before you order, and no guessing about what else is in the bag. A surplus lot or an auction pallet is a bet on mixed types, unreadable house markings and a count you did not choose. Here the number on the body is the number you ordered. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
A script N on a package the size of a pencil eraser, from the years when a small signal PNP was a decision somebody made on paper and then soldered by hand. If a board on your bench still asks for a 4250, this one has been waiting a long time to answer it.
