S8550 PNP Transistors, SS8550 Variants and Assortment Kits
Compare S8550 and SS8550 PNP bipolar transistor selections with complementary NPN choices and mixed component kits. The current listings include through-hole TO-92 packs, SOT-23 surface-mount options, an SS8550 SOT-89 option, paired transistor packs and assorted transistor books. Use the selected variant and its packing list, not a shared title, to identify what you will receive.
Single-model and paired choices
- TO-92: several pages let you choose S8550 or SS8550 in packs labeled 20, 50 or 100 pieces. The same menus also offer S8050 or SS8050 NPN devices and S9011/S9012-family alternatives; choosing those does not supply S8550. One listing offers 25, 50 or 100 pairs of SS8050 and SS8550: a pair is two different transistor types, not two PNP transistors.
- SOT-23: options name S8550 with marking 2TY and SS8550 with marking Y2, in 50-, 100- and 200-piece selections or a full-reel option labeled 3,000 pieces on a shared page. A separate SS8550 SOT-89 listing is labeled 10 pieces. Match the actual package and device designation rather than assuming S8550 and SS8550 share ratings or footprints.
- Shared model menus: some SOT-23 listings also offer MMBT3906, MMBT5401, S9012, BC856B and other PNP types, alongside NPN devices, TL431 references, voltage regulators, diodes and MOSFETs. A printing code such as 2TY or Y2 is useful for screening the selected option but cannot alone establish manufacturer, electrical rating or interchangeability.
Assortments and quantities
TO-92 kits include ten-value sets of 100 or 200 total pieces, 18-value / 180-piece, 15-value / 600-piece and 24-value / 480- or 840-piece configurations. One ten-value / 200-piece kit explicitly lists 20 S8550 among 20 pieces of each of ten types, not 200 S8550. The SOT-23 sample book offers 36 kinds at 25 or 50 pieces per kind, labeled 900 or 1,800 pieces, and lists S8550 and SS8550 separately alongside other devices. Other SMD kits mix transistors with diodes, MOSFETs or reference devices, and some named kit variants may omit S8550 altogether. Check each selected kit's model list, count per model, and box or bag quantity.
Selection checklist
- Choose the exact S8550 or SS8550 option, its PNP polarity, package and quantity. Option names such as “Color” or “Voltage” can encode model and count rather than physical color or voltage.
- Compare the selected manufacturer's datasheet for pin assignment, collector-emitter voltage, collector current, gain at the operating point, saturation behavior and thermal dissipation. Do not apply a title's ratings to all models or packages on a shared page.
- For a PCB replacement, match TO-92 versus SOT-23 versus SOT-89 footprint and lead orientation. S8050/SS8050 NPN devices are not drop-in substitutes for PNP S8550/SS8550.
- For kits, distinguish a single-model pack, an NPN/PNP pair and a multi-value assortment. Confirm per-model contents where the product's title, generic classification and selected option disagree.
Frequently asked questions
Are S8550 and SS8550 the same part?
Do not assume so. Listings distinguish the designations and offer different package and marking choices. Check the actual manufacturer's datasheets for the selected devices before substitution.
Does a 200-piece assortment contain 200 S8550 transistors?
No when it is the specified ten-value kit: the listed breakdown is 20 of each type, including 20 S8550. Other kits have different contents, so check the selected listing.
Can S8050 replace S8550?
No. The listings distinguish S8050 as NPN and S8550 as PNP. Verify polarity, pinout and operating specifications for your circuit.
Does every SMD sample kit include S8550?
No blanket guarantee. The 36-kind sample book lists S8550 and SS8550, but other mixed kits and named options differ. Confirm the exact selected kit's model breakdown.
