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TO-92 · S8050
ActiveNPN Medium-Power BJT
S8050
Diodes Incorporated · TO-92 · NPN Medium-Power BJT
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Overview
The S8050 (sold by Diodes Incorporated as SS8050, and by onsemi, Samsung-descended and many Asian vendors under the same number) is the standard NPN medium-power low-voltage transistor in TO-92, and it is the part behind countless Class-B push-pull audio output stages, relay drivers and small motor switches. It is rated 25V collector-emitter, 40V collector-base and 6V emitter-base, with 1.5A continuous collector current and 1W of dissipation at TA = 25°C (derate 8mW/°C, RθJA 125°C/W).
DC current gain is 85 to 300 at VCE = 1V and IC = 100mA, with a guaranteed minimum of 40 at 800mA, and vendors sort the part into gain bands (B: 85-160, C: 120-200, D: 160-300) so matched pairs can be specified. Saturation voltage is 0.5V maximum at IC = 800mA with IB = 80mA, and the 100MHz gain-bandwidth product is ample for audio and switching duty.
Sourcing reality: the S8050/S8550 pair is one of the most second-sourced and most counterfeited transistor families in Asia. Diodes Inc, onsemi, JCET-era Chinese fabs and unmarked no-name parts all circulate, and gain band, VCEO and saturation vary widely between them. For production, specify the vendor and band (for example SS8050DBU) and verify hFE at 100mA plus VCE(sat) at 800mA on incoming inspection. Shenzhen stock is extremely deep, MOQ 2,000 pcs fan-fold or 10,000 pcs bulk box.
Key Features
- 25V / 1.5A NPN medium-power transistor in TO-92
- hFE 85-300 at IC = 100mA, sorted into B/C/D bands
- 1W dissipation at TA = 25°C
- VCE(sat) 0.5V max at 800mA
- Complementary pair with S8550
Typical Applications
- Class-B push-pull audio output stages (with S8550)
- Relay, solenoid and small motor switching up to 1.5A
- Driver stage ahead of power transistors
- Voltage regulators and constant-current sources
- Toy, radio and portable audio amplifiers
- H-bridge low-side and high-side helper switches
Specifications
- Polarity / Channel Type
- NPN
- Collector-Emitter Voltage (VCEO)
- 25 V
- Collector-Base Voltage (VCBO)
- 40 V
- Continuous Collector Current (IC)
- 1.5 A
- DC Current Gain hFE (VCE = 1 V, IC = 100 mA)
- 85 to 300
- VCE(sat) max (IC = 800 mA, IB = 80 mA)
- 0.5 V
- Gain-Bandwidth Product (fT)
- 100 MHz
- Power Dissipation (PD, TA = 25 °C)
- 1 W
- Pins
- 3
- RoHS
- Compliant
Procurement Tips
Always order a stated gain band and vendor code (for example SS8050DBU) and require an hFE sample report per lot; unmarked generic S8050 bags are the single most common source of mismatched push-pull pairs in Asian contract manufacturing.
Frequently Asked Questions
S8050 vs SS8050 - same part?
Same device family; SS8050 is the vendor ordering prefix used by Diodes Incorporated and onsemi (for example SS8050DBU), while S8050 is the generic Asian marking. Ratings are identical (25V, 1.5A, 1W). Specify the vendor code on your BOM to lock down gain band and quality.
S8050 vs 2N2222 / PN2222A - which for a 1A load?
S8050. It is rated 1.5A continuous with 1W dissipation and keeps hFE above 40 at 800mA, while PN2222A is a 600mA part whose gain collapses above 500mA. For loads between 0.5A and 1.5A in TO-92, S8050 is the correct choice.
What do the gain bands B, C and D mean?
Vendors bin hFE measured at VCE = 1V, IC = 100mA: B is 85-160, C is 120-200, D is 160-300. For push-pull audio pairs specify the same band on both NPN and PNP to keep the stage balanced; for switching, any band works if you size base drive for the worst case.
Can the S8050 dissipate 1W continuously?
Only with copper help. The 1W figure assumes TA = 25°C on the specified FR-4 land pattern; RθJA is 125°C/W, so 1W raises the junction 125°C above ambient. In a 50°C enclosure you must stay under about 0.6W, or add heatsinking and airflow.
Why is the S8050 so counterfeit-prone and how do I check?
Its huge volume in radios, toys and chargers makes it a favorite for remarked and no-name dies. Curve-trace hFE at IC = 100mA (genuine: 85-300 in the stated band), check VCE(sat) at 800mA/80mA (under 0.5V), and verify VCEO above 25V. Fakes often read hFE under 50 or saturate above 1V.
What is the MOQ and lead time?
MOQ is 2,000 pcs fan-fold (CTA/DTA) or 10,000 pcs bulk box (BBU/CBU/DBU) for Diodes Inc SS8050; 100 pcs loose for prototypes. Shenzhen stock ships same day to 2 days; authorized replenishment is 6-10 weeks.
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