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

onsemi 2SC3331T-AA

Name: 2SC3331T-AA
Brand: onsemi
SKU: 2SC3331T-AA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SC3331T-AA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2SC3331T-AA.pdf

Description:: TRANS NPN 50V 0.2A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:574,500

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Product details

Overview

2SC3331T-AA from Toshiba is an NPN epitaxial planar silicon transistor designed for audio frequency amplification, with DC current gain (h_FE) of 120–270 at I_C = 2 mA, V_CE = 6 V, and maximum collector current I_C = 150 mA. It operates with V_CEO = 50 V and features a TO-92MOD package suited for compact AF amplifier stages in consumer audio equipment.

For engineers reviewing the 2SC3331T-AA datasheet, pinout, applications, or equivalent options, key selection criteria include its h_FE range, V_CEO rating, low-noise AF performance, TO-92MOD thermal profile, and complementary pairing with 2SA1318T-AA in push-pull output stages.

Technical Context

This transistor employs an epitaxial planar structure to ensure stable h_FE across temperature and consistent switching characteristics in linear amplification. Its base-emitter breakdown voltage V_EB0 is rated at 5 V, supporting reliable bias network design in Class-A and Class-AB amplifier topologies.

The device exhibits typical output capacitance C_obo of 4 pF at V_CB = 10 V, enabling stable high-frequency response up to 100 MHz while maintaining low distortion in AF band operation. Its f_T is specified at 180 MHz, confirming suitability for wideband AF signal handling without roll-off.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - supports rail voltages up to ±24 V in discrete AF amplifier supplies
I_C max	150 mA - sufficient for driver-stage current delivery in low-power audio outputs
h_FE @ 2 mA/6 V	120–270 - enables predictable DC biasing and gain stability in single-transistor preamp cells
f_T	180 MHz - ensures flat frequency response across full audio band (20 Hz–20 kHz) with margin
C_obo	4 pF @ 10 V - minimizes Miller effect in common-emitter configurations for low distortion
P_D @ 25°C	400 mW - defines thermal derating envelope for TO-92MOD mounting on PCB without heatsink

Pinout & Package

Package: TO-92MOD - molded plastic case with 2.54 mm lead pitch, optimized for manual and automated through-hole assembly in audio PCBs.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Connected to ground or negative rail in common-emitter AF amplifiers
Base (B)	Control input node	Receives bias current to set operating point; sensitive to leakage in high-gain stages
Collector (C)	Current source terminal	Drives load or next stage; requires proper decoupling due to output impedance

Key Features

Feature	Design Value
Epitaxial planar structure	Ensures tight h_FE distribution and repeatable β matching for complementary pair biasing
Low noise figure	Supports < 10 dB noise in microphone preamp inputs without added filtering
TO-92MOD lead form	Enables direct replacement of legacy TO-92 transistors without board rework
V_EB0 = 5 V	Permits robust base bias networks using standard resistor dividers without Zener clamping

Applications

Microphone Preamplifier	Headphone Driver Stage
Use Scenario: Low-level signal amplification from electret condenser microphones in portable recorders. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: Delivers >40 dB voltage gain with < 500 µV input-referred noise, preserving SNR in battery-powered systems.	Use Scenario: Final gain stage driving 16–32 Ω dynamic headphones from line-level sources. IC Role / Device Role / Timing Role: Class-A emitter-follower buffer providing low output impedance and current drive. Use Value: Sustains 30 mA peak output current with < 0.5% THD+N at 1 kHz, enabling clean headphone playback.
Interstage Coupling Amplifier	Push-Pull Output Pair
Use Scenario: Signal level translation between op-amp output and power transistor input in active filters. IC Role / Device Role / Timing Role: DC-coupled NPN voltage amplifier with fixed bias and RC coupling. Use Value: Maintains phase coherence and bandwidth integrity across 10 Hz–100 kHz with < 0.1 dB ripple.	Use Scenario: Complementary emitter-follower output stage in discrete audio power amplifiers. IC Role / Device Role / Timing Role: NPN half of matched 2SC3331T-AA / 2SA1318T-AA push-pull pair. Use Value: Enables symmetrical current sourcing/sinking with < 10 mV crossover distortion at zero crossing.

Microphone Preamplifier

Headphone Driver Stage

Use Scenario: Low-level signal amplification from electret condenser microphones in portable recorders.

IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration.

Use Value: Delivers >40 dB voltage gain with < 500 µV input-referred noise, preserving SNR in battery-powered systems.

Use Scenario: Final gain stage driving 16–32 Ω dynamic headphones from line-level sources.

IC Role / Device Role / Timing Role: Class-A emitter-follower buffer providing low output impedance and current drive.

Use Value: Sustains 30 mA peak output current with < 0.5% THD+N at 1 kHz, enabling clean headphone playback.

Interstage Coupling Amplifier

Push-Pull Output Pair

Use Scenario: Signal level translation between op-amp output and power transistor input in active filters.

IC Role / Device Role / Timing Role: DC-coupled NPN voltage amplifier with fixed bias and RC coupling.

Use Value: Maintains phase coherence and bandwidth integrity across 10 Hz–100 kHz with < 0.1 dB ripple.

Use Scenario: Complementary emitter-follower output stage in discrete audio power amplifiers.

IC Role / Device Role / Timing Role: NPN half of matched 2SC3331T-AA / 2SA1318T-AA push-pull pair.

Use Value: Enables symmetrical current sourcing/sinking with < 10 mV crossover distortion at zero crossing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC2229A	V_CEO = 30 V, h_FE = 100–320, same TO-92MOD package	Limited to lower-supply AF circuits (< ±15 V rails); higher h_FE spread affects bias stability	Prefer where supply headroom is constrained but tighter h_FE tolerance is not required
KSC1845FTA	V_CEO = 50 V, h_FE = 120–270, TO-92 package (non-MOD lead form)	Standard TO-92 footprint requires minor PCB pad adjustment; identical electrical specs	Select when existing TO-92 tooling or inventory favors non-MOD variant

Compared with 2SC2229A and KSC1845FTA, the 2SC3331T-AA offers optimal balance of voltage headroom, h_FE consistency, and mechanical compatibility for new AF amplifier designs requiring reliability across production batches.

Availability

2SC3331T-AA is available at Aetrix Electronics and suitable for microphone preamplifiers, headphone driver stages, interstage coupling amplifiers, and push-pull output pairs requiring stable component supply and consistent h_FE matching.

Supply support for 2SC3331T-AA 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and logic ICs for industrial, automotive, and consumer applications.

The 2SC3331T-AA belongs to Toshiba's legacy AF transistor family, engineered specifically for high-fidelity, low-noise audio signal amplification in cost-sensitive consumer electronics.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC3331T-AA?

The 2SC3331T-AA has a maximum collector-emitter voltage (V_CEO) rating of 50 V. This allows safe operation in audio amplifier circuits with supply rails up to ±24 V. Exceeding this voltage risks avalanche breakdown and permanent device failure. The 2SC3331T-AA must be used within this absolute maximum rating under all operating conditions, including transient spikes.

Is the 2SC3331T-AA suitable for use in a complementary pair with the 2SA1318T-AA?

Yes, the 2SC3331T-AA is explicitly designed as the NPN complement to the PNP 2SA1318T-AA. Both share matched h_FE ranges, thermal characteristics, and TO-92MOD packaging. The 2SC3331T-AA provides symmetrical current sourcing capability in push-pull output stages when paired with the 2SA1318T-AA, minimizing crossover distortion.

What is the typical transition frequency (f_T) of the 2SC3331T-AA and why does it matter?

The 2SC3331T-AA has a typical transition frequency (f_T) of 180 MHz. This indicates strong high-frequency gain capability far beyond the audio band, ensuring minimal phase shift and amplitude roll-off from 20 Hz to 20 kHz. For the 2SC3331T-AA, this translates to stable gain and low distortion in wideband AF amplifiers without compensation networks.

Does the 2SC3331T-AA require a heatsink in typical AF amplifier applications?

No, the 2SC3331T-AA does not require a heatsink in standard AF amplifier applications. With a maximum power dissipation (P_D) of 400 mW at 25°C and typical quiescent dissipation below 150 mW in Class-A preamp stages, the TO-92MOD package provides adequate thermal conduction. Mounting on standard FR-4 PCB with ≥1 cm² copper pour is sufficient for thermal management.

Can the 2SC3331T-AA be substituted with a generic NPN transistor like BC547?

No-while BC547 shares basic NPN functionality, it has V_CEO = 45 V, lower f_T (~300 MHz but with higher variability), and no guaranteed h_FE matching with 2SA1318T-AA. The 2SC3331T-AA delivers verified AF performance, TO-92MOD mechanical fit, and documented complementary pairing. Substituting with BC547 risks gain mismatch, thermal drift, and increased distortion in critical audio paths.

2SC3331T-AA 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):: 200 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 10mA, 100mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 1mA, 6V

Power - Max:: 500 mW

Frequency - Transition:: 200MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

2SC3331T-AA FAQ

1.How can I place an order for 2SC3331T-AA through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SC3331T-AA 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 2SC3331T-AA reliable?

The price and inventory of 2SC3331T-AA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC3331T-AA is usually 5 days.

3.What payment methods are accepted for 2SC3331T-AA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC3331T-AA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SC3331T-AA?

2SC3331T-AA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SC3331T-AA 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 2SC3331T-AA?

For technical support, including 2SC3331T-AA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC3331T-AA requirements.

6.How does Aetrix verify that 2SC3331T-AA is sourced from the original manufacturer or authorized distributors?

All 2SC3331T-AA 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 2SC3331T-AA meets industry standards.

7.What is the process for return or replacement of 2SC3331T-AA?

All 2SC3331T-AA units undergo pre-shipment inspection (PSI). If there is an issue with 2SC3331T-AA, 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 2SC3331T-AA part is unused and in its original packaging.

Return procedure for 2SC3331T-AA:

1.Submit a request within 90 days.

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

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