Yangjie Technology S8050-H
Full Technical Specifications
11 Parameters| Parameter / Attribute | Specification / Value |
|---|---|
| Mounting | Through Hole |
| FET type | NPN |
| Voltage - collector emitter breakdown | 25 V |
| Current - collector (Ic) | 500 mA |
| Current - collector cutoff | 100nA |
| DC current gain (hFE) (Min) @ ic, vce | 200 @ 50mA, 1V |
| Power - max | 300 mW |
| Frequency - transition | 150MHz |
| Operating temperature | 150°C(TJ) |
| Package | Tape & Reel (TR) |
| Vce saturation (Max) @ ib, ic | 600mV @ 50mA, 500mA |
Need Stock or a Drop-in Second-Source for S8050-H?
Package: TO-92 / SOT-23 · Pin-compatible replacements with immediate Shenzhen spot stock
The S8050 / S8550 pair is the transistor of Chinese mass production - relays, chargers, LED drivers, small audio stages, appliance boards. Every fab makes it, it costs almost nothing, and that is exactly the problem: vendor specifications drift (collector-emitter ratings quoted at 20V by some makers and 25V by others), the SS prefix versions pass over twice the current in the same body, and the TO-92 lead order (E-B-C) is the mirror of the European small-signal parts it gets cross-referenced against (C-B-E). Substitution on this pair is a pinout and vendor-grade exercise, not an electrical one.
Verified Pin-Compatible Replacements (4 verified alternatives)
The Same Part, Twice the Current
Shenzhen Spot Stock (24-48h Dispatch)
The "large current" grade of the same transistor: rated about 1.5A where the plain S8050 passes 700mA class, with the same E-B-C lead order.
Same voltage class (25V typical, vendor-dependent); dissipation rises with the bigger die.
The Same Pinout, Different Curves
Shenzhen Spot Stock (24-48h Dispatch)
E-B-C lead order like the S8050 - physically drops in - with 40V / 200mA ratings and different gain curves (hFE 100-300 at 10mA).
VCEO 40V; IC 200mA - less than a third of the S8050 current.
Better Spec, Mirrored Wiring
Shenzhen Spot Stock (24-48h Dispatch)
Electrically the natural European equivalent: 45V / 800mA - equal or better than the S8050 on both axes - but the TO-92 lead order is C-B-E, the reverse arrangement.
VCEO 45V versus the S8050 25V class: a genuine upgrade in margin.
The PNP Half of the Pair
Shenzhen Spot Stock (24-48h Dispatch)
The PNP complement: -25V class, 700mA, same E-B-C order - designed to sit opposite the S8050 in push-pull and complementary drive stages.
Same voltage class as the NPN, vendor-dependent as always.
Buyer & Quality Checklist for Sourcing Alternatives
- The lead order is E-B-C (emitter first) - the same arrangement as 2N3904 and the mirror of BC547 / BC337 (C-B-E). Every cross-reference direction on this pair must answer the pinout question before the electrical one.
- Specification drift is real on this family: collector-emitter ratings are quoted at 20V by some makers and 25V by others. For anything mains-derived or inductive, measure margins against the vendor datasheet you actually bought, not the number in memory.
- The SS prefix (SS8050 / SS8550) is the 1.5A grade in the same body - worth checking when a plain part failed hot, and worth verifying on the printed marking before assuming it.
- hFE spreads from roughly 85 to 400 across makers; in complementary pairs order both halves from one fab lot, and in analog stages check the gain against the schematic note.
- The SOT-23 versions are the same transistor in chip form with industry marking codes (J3Y-style for the S8050 family) - the marking is fab-specific, so identify by code table of the actual maker.
- For relay and inductive loads, keep the flyback diode and verify the base resistor for the actual gain class fitted - the same board can saturate one 400-hFE part and cook one 85-hFE part.
Frequently Asked Technical Questions
Q: What is the difference between S8050 and SS8050?
A: Current grade: the plain S8050 passes about 700mA, the SS8050 about 1.5A, in the same TO-92 body and the same E-B-C pinout. The prefix letters are the entire difference - check the printed marking.
Q: Can I replace an S8050 with a BC337?
A: Electrically the BC337 is equal or better (45V / 800mA), but the TO-92 lead order is reversed: BC337 is C-B-E against the S8050 E-B-C. A straight insertion swaps emitter and collector. Either re-form the leads or use 2N3904 / SS8050 to keep the socket order.
Q: Is S8550 the PNP version of S8050?
A: Yes - a complementary pair at mirrored polarities with the same E-B-C order, used together in push-pull stages. Note the numbers differ by one character; fitting the PNP half into the NPN position (or the reverse) is a dead board on power-up.