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

onsemi SS8050CTA

Name: SS8050CTA
Brand: onsemi
SKU: SS8050CTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SS8050CTA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: SS8050CTA.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:28,780

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Product details

Overview

SS8050CTA from onsemi is an NPN epitaxial silicon transistor in TO-92-3 (case 135AR) 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 120–200 at I_C = 100 mA and is optimized for Class B push-pull audio amplifier stages in portable radios.

For engineers reviewing the SS8050CTA datasheet, pinout, applications, or equivalent options, key selection criteria include its V_CEO/I_C rating, h_FE classification (C-grade), saturation voltage (V_CE(sat) ≤ 0.5 V @ 800 mA), thermal resistance (R_JA = 125 °C/W), and Pb-free TO-92-3 leadformed package compatibility with automated assembly.

Technical Context

This discrete NPN bipolar junction transistor operates in linear or switching mode with verified breakdown voltages: 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 confirms suitability for low-to-mid RF amplification and fast-switching applications up to ~10 MHz.

The device exhibits defined h_FE bins-C grade spans 120–200-and specified saturation characteristics: V_CE(sat) ≤ 0.5 V and V_BE(sat) ≤ 1.2 V at I_C = 800 mA / I_B = 80 mA. Output capacitance C_ob = 9.0 pF at V_CB = 10 V supports stable high-frequency bias networks.

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 limit; defines maximum load drive capability in switching or linear operation.
h_FE (C grade)	120–200 - Verified DC current gain range at V_CE = 1 V, I_C = 100 mA; enables predictable base drive sizing.
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; sets upper frequency limit for small-signal amplification.
C_ob	9.0 pF @ V_CB = 10 V - Collector-base junction capacitance; impacts high-frequency stability and Miller effect in amplifier designs.
R_JA	125 °C/W - Junction-to-ambient thermal resistance on standard FR-4 PCB; determines temperature rise under 1 W dissipation.

Pinout & Package

SS8050CTA uses the TO-92-3 package (case 135AR), a leadformed through-hole plastic package with 4.83 mm × 4.76 mm footprint and standardized pin orientation when viewed with flat side facing outward and leads down.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path from transistor	Connected to ground or low-side reference; polarity defines NPN operation and current direction.
2 (Base)	Control terminal for minority-carrier injection	Receives forward-biased current to modulate collector current; requires current-limiting resistor in most circuits.
3 (Collector)	Current entry path into transistor	Connected to load or supply rail; handles full output current and must be routed for thermal/EMI control.

Key Features

Feature	Design Value
Complementary pairing	Matched performance with SS8550 PNP for push-pull amplifier stages without gain mismatch.
C-grade h_FE bin	120–200 h_FE at 100 mA ensures consistent base drive requirements across production lots.
Pb-free, RoHS-compliant	Meets EU RoHS Directive 2011/65/EU and halogen-free/BFR-free requirements for industrial and consumer PCBs.
TO-92-3 leadformed (135AR)	Pre-bent leads enable direct insertion into wave-solder or selective solder fixtures; reduces manual handling.

Applications

Portable Audio Amplifiers	DC-DC Converter Switches
Use Scenario: Class B push-pull output stage in battery-powered AM/FM radios and mini speakers. IC Role / Device Role / Timing Role: NPN switching/amplifying element delivering audio signal swing across speaker load. Use Value: Low V_CE(sat) (≤0.5 V) preserves battery runtime; 100 MHz f_T supports clean mid-band audio reproduction.	Use Scenario: Low-side switch in 5–24 V step-down converter topologies driving MOSFET gates or small solenoids. IC Role / Device Role / Timing Role: Fast-turning discrete switch controlling duty-cycle-dependent energy transfer. Use Value: Verified 1.5 A I_C rating and 125 °C/W R_JA support reliable operation at 100 kHz switching frequencies.
LED Driver Circuits	Signal-Level Logic Interfaces
Use Scenario: Constant-current driver for multi-LED arrays in signage or indicator panels. IC Role / Device Role / Timing Role: Linear current regulator with emitter-degeneration resistor feedback. Use Value: Tight h_FE bin (120–200) enables precise current setting; 25 V V_CEO accommodates common 12–24 V bus rails.	Use Scenario: Level-shifting interface between 3.3 V microcontrollers and 5 V peripheral logic. IC Role / Device Role / Timing Role: Saturated switch translating TTL/CMOS logic states with minimal propagation delay. Use Value: V_BE(sat) ≤ 1.2 V ensures full turn-on with 3.3 V GPIO; 9.0 pF C_ob limits capacitive loading on driving source.

Portable Audio Amplifiers

DC-DC Converter Switches

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

IC Role / Device Role / Timing Role: NPN switching/amplifying element delivering audio signal swing across speaker load.

Use Value: Low V_CE(sat) (≤0.5 V) preserves battery runtime; 100 MHz f_T supports clean mid-band audio reproduction.

Use Scenario: Low-side switch in 5–24 V step-down converter topologies driving MOSFET gates or small solenoids.

IC Role / Device Role / Timing Role: Fast-turning discrete switch controlling duty-cycle-dependent energy transfer.

Use Value: Verified 1.5 A I_C rating and 125 °C/W R_JA support reliable operation at 100 kHz switching frequencies.

LED Driver Circuits

Signal-Level Logic Interfaces

Use Scenario: Constant-current driver for multi-LED arrays in signage or indicator panels.

IC Role / Device Role / Timing Role: Linear current regulator with emitter-degeneration resistor feedback.

Use Value: Tight h_FE bin (120–200) enables precise current setting; 25 V V_CEO accommodates common 12–24 V bus rails.

Use Scenario: Level-shifting interface between 3.3 V microcontrollers and 5 V peripheral logic.

IC Role / Device Role / Timing Role: Saturated switch translating TTL/CMOS logic states with minimal propagation delay.

Use Value: V_BE(sat) ≤ 1.2 V ensures full turn-on with 3.3 V GPIO; 9.0 pF C_ob limits capacitive loading on driving source.

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
SS8050CBU	Same die, TO-92-3 case 135AN (non-leadformed); 10,000 units/bulk box	Requires straight-lead insertion and post-solder trimming; less suitable for wave-solder automation	Select SS8050CBU only if bulk packaging and manual/robotic placement without leadforming is preferred.
MPSA42	Higher V_CEO = 300 V, lower I_C = 500 mA, TO-92 package, h_FE = 50–250	Designed for high-voltage switching (e.g., flyback snubbers), not audio amplification or medium-current loads	Choose MPSA42 only when >100 V collector voltage is required; not a functional replacement for SS8050CTA in 25 V applications.

Compared with SS8050CBU, SS8050CTA offers leadformed leads for automated assembly but identical electrical specs; versus MPSA42, SS8050CTA provides higher current drive and lower saturation voltage at the cost of reduced breakdown voltage-making it optimal for 24 V-class portable electronics rather than HV interfaces.

Availability

SS8050CTA is available at Aetrix Electronics and suitable for portable audio amplifiers, DC-DC converter switches, and LED driver circuits requiring stable component supply, RoHS compliance, and TO-92-3 leadformed form factor.

Supply support for SS8050CTA 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 cloud power markets.

The SS8050 series belongs to onsemi's general-purpose bipolar transistor portfolio, designed specifically for cost-sensitive, high-volume applications in portable audio, power conversion, and interface circuitry where reliability, consistency, and Pb-free compliance are mandatory.

FAQ

What is the package type and lead configuration of SS8050CTA?

SS8050CTA uses the TO-92-3 package (case 135AR) with pre-leadformed (bent) leads optimized for wave-soldering and automated through-hole assembly. Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector when viewing the flat side with leads pointing downward. This differs from the straight-lead SS8050CBU (case 135AN).

What h_FE range does SS8050CTA guarantee, and how is it binned?

SS8050CTA is marked "S8050C" and belongs to the C-grade h_FE bin, guaranteeing a DC current gain of 120–200 at V_CE = 1 V and I_C = 100 mA. This binning ensures predictable base drive design across production lots and matches complementary SS8550 PNP devices for push-pull stages.

Can SS8050CTA replace SS8050DBU in a design?

SS8050CTA and SS8050DBU share identical die and electrical specifications but differ in h_FE bin (C vs. D) and packaging: SS8050CTA is C-grade in TO-92-3 case 135AR (fan-fold, leadformed), while SS8050DBU is D-grade (h_FE = 160–300) in case 135AN (bulk, straight leads). Substitution requires validation of gain sensitivity in the target circuit.

What is the maximum power dissipation of SS8050CTA, and how does thermal derating work?

SS8050CTA has a maximum power dissipation of 1 W at T_A = 25°C, derating linearly by 8 mW/°C above that temperature. With R_JA = 125 °C/W on a standard FR-4 board, junction temperature rises 125°C per watt-so sustained 1 W operation requires ambient ≤ 25°C or active cooling to avoid exceeding the 150°C maximum junction temperature.

Is SS8050CTA suitable for switching applications above 100 kHz?

Yes-SS8050CTA's f_T = 100 MHz and low C_ob = 9.0 pF support reliable switching up to ~10 MHz in small-signal contexts. For hard-switching above 100 kHz, verify turn-on/turn-off times and saturation behavior under actual load conditions; its V_CE(sat) ≤ 0.5 V at 800 mA helps minimize switching losses in medium-current DC-DC stages.

SS8050CTA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Cut Tape (CT)

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:: 120 @ 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

SS8050CTA FAQ

1.How can I place an order for SS8050CTA through Aetrix?

Please submit a Request for Quotation (RFQ) for SS8050CTA 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 SS8050CTA reliable?

The price and inventory of SS8050CTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS8050CTA is usually 5 days.

3.What payment methods are accepted for SS8050CTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS8050CTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SS8050CTA?

SS8050CTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SS8050CTA 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 SS8050CTA?

For technical support, including SS8050CTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS8050CTA requirements.

6.How does Aetrix verify that SS8050CTA is sourced from the original manufacturer or authorized distributors?

All SS8050CTA 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 SS8050CTA meets industry standards.

7.What is the process for return or replacement of SS8050CTA?

All SS8050CTA units undergo pre-shipment inspection (PSI). If there is an issue with SS8050CTA, 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 SS8050CTA part is unused and in its original packaging.

Return procedure for SS8050CTA:

1.Submit a request within 90 days.

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

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