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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi SS8050DBU

Name: SS8050DBU
Brand: onsemi
SKU: SS8050DBU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SS8050DBU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: SS8050DBU.pdf

Description:: TRANS NPN 25V 1.5A TO-92-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,379

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Product details

Overview

SS8050DBU from onsemi is an NPN epitaxial silicon transistor in TO-92-3 (case 135AN) package, rated for 1.5 A collector current, 25 V V_CEO, and 1 W power dissipation at 25°C. It delivers DC current gain (h_FE) of 160–300 at I_C = 100 mA, V_CE = 1 V, and is optimized for Class B push-pull audio amplifier stages in portable radios.

For engineers reviewing the SS8050DBU datasheet, pinout, applications, or equivalent options, key selection criteria include its h_FE classification (D-grade), saturation voltage (V_CE(sat) ≤ 0.5 V @ I_C = 800 mA), thermal resistance (R_JA = 125 °C/W), and Pb-free, RoHS-compliant construction in TO-92-3.

Technical Context

This transistor operates as a general-purpose switching and linear amplification device with verified breakdown ratings: V_CBO = 40 V, V_CEO = 25 V, and V_EBO = 6 V. Its f_T = 100 MHz at V_CE = 10 V, I_C = 50 mA supports mid-frequency signal amplification tasks.

Thermal performance is defined by R_JA = 125 °C/W on standard FR-4 PCB (76 mm × 114 mm × 1.57 mm), with 8 mW/°C derating above 25°C ambient. Output capacitance C_ob = 9.0 pF at V_CB = 10 V enables stable operation in RF-coupled preamp stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	25 V - Maximum safe collector-emitter voltage before avalanche breakdown under open-base conditions.
I_C	1.5 A - Continuous DC collector current rating; supports high-current switching in relay drivers and power stage buffers.
h_FE (I_C = 100 mA)	160–300 - D-grade DC current gain range ensures predictable base drive requirements in amplifier bias networks.
V_CE(sat)	≤ 0.5 V @ I_C = 800 mA, I_B = 80 mA - Low saturation voltage minimizes conduction loss in switching applications.
f_T	100 MHz - Current gain bandwidth product validates suitability for VHF preamplifier and oscillator buffer use.
R_JA	125 °C/W - Thermal resistance defines junction-to-ambient temperature rise per watt; requires adequate PCB copper area for 1 W operation.
C_ob	9.0 pF @ V_CB = 10 V - Output capacitance impacts high-frequency stability and Miller effect in common-emitter configurations.

Pinout & Package

SS8050DBU is housed in TO-92-3 plastic package (case 135AN), with leadform per mechanical drawing 98AON13880G. Dimensions: 4.825 mm × 4.76 mm footprint, axial leads, E-B-C pin order when viewed with flat side facing user and leads downward.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or low-impedance return path; sets reference for base-emitter forward bias.
2 (Base)	Control input	Receives current-limited drive to modulate collector current; requires series resistor to limit I_B per h_FE target.
3 (Collector)	Current source terminal	Delivers amplified load current; must be connected to supply rail through load (e.g., speaker, relay coil, LED string).

Key Features

Feature	Design Value
D-grade h_FE binning	Guaranteed 160–300 h_FE at I_C = 100 mA, enabling consistent gain matching in dual-transistor amplifier pairs.
Low V_CE(sat)	≤ 0.5 V under 800 mA load ensures <1.2 W total power loss in saturated switching, improving thermal margin.
RoHS-compliant Pb-free	Meets EU Directive 2011/65/EU and halogen-free/BFR-free requirements for environmentally regulated end equipment.
TO-92-3 mechanical standardization	Compatible with legacy through-hole assembly tooling and automated insertion systems using case 135AN footprint.

Applications

Portable Audio Amplifiers	DC Motor Drivers
Use Scenario: Class B push-pull output stage in battery-powered AM/FM radios and headphone amplifiers. IC Role / Device Role / Timing Role: NPN switching/amplification transistor paired with complementary SS8550 PNP device. Use Value: Delivers 2 W output power with low crossover distortion due to tight h_FE matching and low V_CE(sat).	Use Scenario: Unidirectional H-bridge half-bridge driver for small brushed DC motors (e.g., toy vehicles, fans). IC Role / Device Role / Timing Role: High-side or low-side switch controlling motor current flow via microcontroller GPIO. Use Value: Supports 1.5 A peak motor stall current while maintaining <0.5 V dropout, reducing heat generation in compact enclosures.
LED Constant-Current Drivers	Relay Interface Circuits
Use Scenario: Linear current regulator for high-brightness white LEDs in emergency lighting and signage. IC Role / Device Role / Timing Role: Pass element in emitter-follower configuration with feedback resistor setting I_LED. Use Value: Stable 100–800 mA current control across 5–20 V supply range, leveraging h_FE-based current mirroring.	Use Scenario: Microcontroller-driven interface to 12 V/24 V electromagnetic relays in industrial control panels. IC Role / Device Role / Timing Role: Saturated switch isolating logic-level MCU outputs from inductive relay coils. Use Value: Fast turn-off with minimal stored charge (C_ob = 9.0 pF) reduces relay release delay and flyback spike duration.

Portable Audio Amplifiers

DC Motor Drivers

Use Scenario: Class B push-pull output stage in battery-powered AM/FM radios and headphone amplifiers.

IC Role / Device Role / Timing Role: NPN switching/amplification transistor paired with complementary SS8550 PNP device.

Use Value: Delivers 2 W output power with low crossover distortion due to tight h_FE matching and low V_CE(sat).

Use Scenario: Unidirectional H-bridge half-bridge driver for small brushed DC motors (e.g., toy vehicles, fans).

IC Role / Device Role / Timing Role: High-side or low-side switch controlling motor current flow via microcontroller GPIO.

Use Value: Supports 1.5 A peak motor stall current while maintaining <0.5 V dropout, reducing heat generation in compact enclosures.

LED Constant-Current Drivers

Relay Interface Circuits

Use Scenario: Linear current regulator for high-brightness white LEDs in emergency lighting and signage.

IC Role / Device Role / Timing Role: Pass element in emitter-follower configuration with feedback resistor setting I_LED.

Use Value: Stable 100–800 mA current control across 5–20 V supply range, leveraging h_FE-based current mirroring.

Use Scenario: Microcontroller-driven interface to 12 V/24 V electromagnetic relays in industrial control panels.

IC Role / Device Role / Timing Role: Saturated switch isolating logic-level MCU outputs from inductive relay coils.

Use Value: Fast turn-off with minimal stored charge (C_ob = 9.0 pF) reduces relay release delay and flyback spike duration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT8050-D-TP (Micro Commercial)	Same h_FE grade (160–300), identical TO-92-3 package, but R_JA = 200 °C/W (higher thermal resistance).	Limited to <0.5 W continuous dissipation without heatsinking; unsuitable for sustained 1 W Class B audio output.	Select only for low-duty-cycle switching where thermal mass limits average power.
BC817-40 (Nexperia)	SMD SOT-23 package, lower I_C = 500 mA, h_FE = 250–630 at I_C = 100 mA, V_CEO = 45 V.	Not pin-compatible; requires PCB redesign; better suited for space-constrained digital logic interfacing than audio power stages.	Choose for surface-mount designs prioritizing board density over analog linearity or power handling.

Compared with MMBT8050-D-TP and BC817-40, SS8050DBU provides superior thermal performance (R_JA = 125 °C/W), higher current capability (1.5 A), and proven suitability for audio amplifier output stages-making it the preferred choice for through-hole, thermally demanding, medium-power linear applications.

Availability

SS8050DBU is available at Aetrix Electronics and suitable for portable audio amplifiers, relay interface circuits, LED constant-current drivers, and DC motor drivers requiring stable component supply and full RoHS compliance.

Supply support for SS8050DBU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and consumer markets.

The SS8050DBU belongs to onsemi's general-purpose bipolar transistor product line, designed specifically for cost-sensitive, medium-power linear amplification and switching applications in portable and industrial electronics.

FAQ

What is the h_FE range guaranteed for SS8050DBU?

The SS8050DBU is binned to the D-grade h_FE classification, guaranteeing a DC current gain of 160–300 when measured at V_CE = 1 V and I_C = 100 mA. This range is confirmed in the official onsemi datasheet (Rev. 2, February 2022) and applies specifically to the SS8050DBU top mark "S8050D". The SS8050DBU's h_FE consistency supports matched-pair designs in push-pull amplifier configurations.

Is SS8050DBU pin-compatible with SS8550?

Yes, SS8050DBU is complementary and mechanically pin-compatible with the PNP SS8550, sharing the same TO-92-3 (case 135AN) package and E-B-C pinout. This allows direct pairing in Class B push-pull amplifier stages without layout changes. However, SS8050DBU is NPN while SS8550 is PNP, so polarity and biasing must be reversed in circuit design. Both devices are specified for 1.5 A I_C and share identical absolute maximum ratings except for polarity-dependent voltages.

What is the maximum power dissipation of SS8050DBU at 70°C ambient?

At 70°C ambient, SS8050DBU's maximum power dissipation is derated from 1 W (at 25°C) by 8 mW/°C × (70 − 25) = 360 mW, resulting in a safe operating limit of 640 mW. This calculation follows the thermal characteristics table in the onsemi SS8050/D datasheet. Exceeding this limit risks junction temperature exceeding 150°C, potentially degrading reliability or causing thermal shutdown in unregulated circuits.

Does SS8050DBU support audio frequency amplification up to 20 kHz?

Yes, SS8050DBU supports full-audio-band amplification up to 20 kHz with low distortion. Its f_T = 100 MHz and typical h_FE > 160 at I_C = 10 mA ensure sufficient gain margin well beyond audible frequencies. Measured performance in Figure 2 and Figure 6 of the onsemi datasheet confirms stable h_FE response and low phase shift across 20 Hz–20 kHz when biased appropriately. The SS8050DBU is explicitly cited for "2 W output amplifier of portable radios" in its features list.

What is the meaning of the "DBU" suffix in SS8050DBU?

The "DBU" suffix in SS8050DBU indicates two specific attributes: "D" denotes the h_FE classification grade (160–300), and "BU" signifies packaging in bulk (10,000 units per box) in Pb-free TO-92-3 case 135AN. This ordering code is defined in the "Ordering Information" section of the onsemi SS8050/D datasheet. The SS8050DBU top mark is "S8050D", confirming both the D-grade gain bin and Pb-free compliance.

SS8050DBU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1.5 A

Voltage - Collector Emitter Breakdown (Max):: 25 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 80mA, 800mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 160 @ 100mA, 1V

Power - Max:: 1 W

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

SS8050DBU FAQ

1.How can I place an order for SS8050DBU through Aetrix?

Please submit a Request for Quotation (RFQ) for SS8050DBU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SS8050DBU reliable?

The price and inventory of SS8050DBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS8050DBU is usually 5 days.

3.What payment methods are accepted for SS8050DBU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS8050DBU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SS8050DBU?

SS8050DBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SS8050DBU order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SS8050DBU?

For technical support, including SS8050DBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS8050DBU requirements.

6.How does Aetrix verify that SS8050DBU is sourced from the original manufacturer or authorized distributors?

All SS8050DBU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SS8050DBU meets industry standards.

7.What is the process for return or replacement of SS8050DBU?

All SS8050DBU units undergo pre-shipment inspection (PSI). If there is an issue with SS8050DBU, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SS8050DBU part is unused and in its original packaging.

Return procedure for SS8050DBU:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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