Product Overview
BZX84C15 15V Zener Diode in SOT-23, Y4 Marking Code, Unused Stock on Original Tape
Condition
Unused, New Old Stock; clean and in excellent condition. The pieces are still seated in their original black embossed carrier tape under clear cover tape, and the photographs show a short cut length of that tape. Each body carries the same Y4 code on top, followed by a small arrow-like third glyph that repeats on every piece but is too fine to resolve with certainty at this scale, and the terminals read bright and unsoldered through the cover film. No maker's logo or wordmark is legible on a package this small. Sold each: you receive one diode per unit ordered, cut from tape like the strip shown, and the photos are representative of the stock rather than a promise of the exact piece pulled.
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Product Overview
The BZX84C15 is a 15V zener diode in a three-lead SOT-23 surface-mount package, and on a body this size the manufacturer prints the marking code Y4 rather than the full part number - which is what you see on every piece in these photos, each Y4 trailed by a small arrow-like glyph that does not read cleanly. It is the small-signal workhorse used for low-power regulation, a fixed reference point, and clamping a rail or an input pin before something downstream sees a voltage it was not designed for. Nominal zener voltage is 15V at a 5 mA test current with a ±5% tolerance band, so a real device sits somewhere between 13.8V and 15.6V. It arrives on tape, ready for pick-and-place or for a steady hand with a fine tip and tweezers.
Key Features
- Zener voltage (VZ): 15V nominal
- Tolerance: ±5%, roughly 13.8V to 15.6V
- Test current (IZT): 5 mA
- Power dissipation: 225 to 300 mW
- Dynamic impedance (ZZT): approximately 30 ohms at IZT
- Reverse leakage: approximately 0.1 µA at 11V
- Package: SOT-23, three-lead surface mount
- Device marking: Y4, followed by a small trailing glyph
- Operating temperature range: -65°C to +150°C
- Supplied on original embossed carrier tape
Applications
- Board repair technician replacing a failed 15V clamp on a densely populated SMD control card
- Hardware engineer prototyping a 15V gate-drive or op-amp rail and needing a fixed reference that does not eat board space
- Instrument builder protecting an analog input pin against overvoltage spikes from field wiring
- Kit assembler stocking a few SOT-23 zeners in the parts drawer instead of a full reel
Frequently Asked Questions
Is the Y4 code on the package the same thing as BZX84C15?
Yes. SOT-23 devices are too small to carry a full part number, so manufacturers use a short marking code, and Y4 is the code that identifies this 15V member of the BZX84 zener family. If your build is marking-critical, check the Y4 code against the marking table in the datasheet you are designing to before you commit the board.
Who made these, and what does that change?
Not confirmed. The only legible marking on the package is the Y4 code and the small trailing glyph that follows it, and the tape carries no printed maker's label in these photos, so we do not name a manufacturer. The BZX84C15 type is second-sourced widely and the figures listed above are the standard published values for it - verify against your chosen manufacturer's datasheet before use.
How are they packaged, and what do I actually receive?
They come to you in their original carrier tape, cover film intact, cut to the quantity you order. One diode per unit ordered. That matters more with surface-mount parts than through-hole ones: tape keeps the terminals clean, keeps the parts oriented the same way, and keeps them from disappearing into a bench mat.
Can I hand-solder a SOT-23 zener, or do I need a reflow oven?
Hand-soldering a three-lead SOT-23 is routine bench work with a fine tip, flux, and tweezers - tack one terminal, align the body, then solder the remaining two. It also runs fine through paste and reflow if that is your process. Orientation follows your board's footprint, so match the cathode to the pad your layout expects.
Why buy three or four of these here instead of a reel of 3,000 somewhere else?
Because almost nobody needs 3,000 zeners. Distributors sell surface-mount parts in cut tape with minimums and line-item fees, and the surplus alternative is a mystery bag of unmarked SOT-23s that you get to identify yourself. Here you buy the exact count your repair or prototype calls for - one for the failed clamp, four for a small run - marked, on original tape, from stock we can see and photograph. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
The Y4 on its back, and the small glyph riding behind it, are the entire nameplate; at SOT-23 scale there is no room for a part number, so a short marking code has to carry the whole identity. Peel one off the tape, set it on the pad, and let it hold your rail at 15 volts while the rest of the board takes the credit.
