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

onsemi 2N3393

Name: 2N3393
Brand: onsemi
SKU: 2N3393
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N3393

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2N3393.pdf

Description:: TRANS NPN 25V 0.5A TO-92-3

Quantity:: RFQ Add To RFQ list

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Inventory:5,607

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Product details

Overview

2N3393 from Fairchild Semiconductor is an NPN general-purpose amplifier transistor designed for low-to-medium power linear amplification and switching applications up to 300 mA collector current. It features V_CEO = 25 V, V_CBO = 25 V, V_EBO = 5.0 V, I_C = 500 mA continuous, and h_FE = 90–180 at I_C = 2.0 mA, used in audio preamplifiers, signal conditioning stages, and discrete logic interface circuits.

For engineers reviewing the 2N3393 datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package, guaranteed h_FE range, thermal resistance (R_θJA = 200 °C/W), noise figure (5.0 dB for 2N3391A only - not applicable to 2N3393), and compatibility with legacy discrete amplifier designs requiring stable DC gain and moderate bandwidth.

Technical Context

The 2N3393 operates as a silicon NPN bipolar junction transistor fabricated using Fairchild's Process 10. Its DC current gain (h_FE) is specified at 90–180 under V_CE = 4.5 V and I_C = 2.0 mA, with small-signal h_fe reaching up to 400 at same bias. Output capacitance (C_ob) is 2.0–10 pF at V_CB = 10 V and f = 1.0 MHz.

It supports continuous operation from −55 °C to +150 °C junction temperature, with absolute maximum ratings including P_D = 625 mW at T_A = 25 °C, derating 5.0 mW/°C above ambient. Thermal resistance from junction to case is 83.3 °C/W, confirming suitability for through-hole PCB mounting without heatsinking in low-duty-cycle applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	25 V - Maximum safe collector-emitter voltage before breakdown; defines usable supply rail headroom in amplifier or switch topologies.
I_C (continuous)	500 mA - Absolute max collector current; enables use in medium-current driver stages, e.g., relay or LED drivers.
h_FE	90–180 - DC current gain range at 2.0 mA collector current; ensures predictable base drive requirements in linear and saturated switching modes.
P_D	625 mW at 25 °C - Total power dissipation limit; sets thermal design boundary for ambient-temperature PCB layouts.
R_θJA	200 °C/W - Junction-to-ambient thermal resistance; indicates need for adequate copper pour or airflow in sustained >200 mW operation.
C_ob	2.0–10 pF - Output capacitance at 10 V reverse bias; impacts high-frequency roll-off and stability in RF-coupled or wideband amplifier stages.

Pinout & Package

2N3393 is housed in a standard TO-92 plastic package with straight leads and no lead clip. Pin identification follows the flat-side orientation: Emitter (E), Collector (C), Base (B) - left-to-right when flat side faces viewer and leads point downward.

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current sink terminal	Reference node for biasing; connects to ground or low-impedance return path in common-emitter configurations.
C (Collector)	Current source terminal	Connects to load or supply rail; carries full output current and dissipates majority of device power.
B (Base)	Control input terminal	Receives current-limited drive signal; requires series resistor to limit I_B and ensure saturation or linear operation.

Key Features

Feature	Design Value
NPN silicon BJT architecture	Enables standard common-emitter amplifier topology with predictable gain and phase response.
Guaranteed h_FE range (90–180)	Reduces variation in base drive design across production lots; simplifies bias network calculation.
TO-92 through-hole package	Supports manual prototyping, wave soldering, and mechanical robustness in industrial control modules.
−55 °C to +150 °C operating range	Validates use in extended-temperature environments such as automotive under-hood or outdoor instrumentation.

Applications

Audio Preamp Stage	Discrete Logic Level Shifter
Use Scenario: Amplifying weak microphone or sensor signals prior to ADC sampling in embedded audio recorders. IC Role / Device Role / Timing Role: NPN transconductance amplifier in common-emitter configuration with emitter degeneration. Use Value: Delivers stable 20–200× voltage gain with low distortion at <100 µA quiescent current, leveraging its h_FE consistency and low C_ob.	Use Scenario: Converting 3.3 V logic outputs to drive 5 V TTL-compatible inputs in mixed-voltage microcontroller systems. IC Role / Device Role / Timing Role: Saturated switch translating logic HIGH/LOW states with minimal propagation delay. Use Value: Achieves reliable turn-on with I_B ≥ 100 µA and full saturation at I_C ≤ 300 mA, avoiding logic misreads due to incomplete switching.
DC Motor Speed Control	LED Driver for Indicator Panels
Use Scenario: PWM-driven low-power DC motor (e.g., cooling fan or actuator) in HVAC control boards. IC Role / Device Role / Timing Role: Low-side switching element modulating average current through motor winding. Use Value: Handles 300 mA continuous coil current with <1 V saturation voltage (V_CE(sat) not explicitly listed but typical for family), minimizing heat generation.	Use Scenario: Driving multi-color status LEDs on industrial HMI panels requiring independent brightness control. IC Role / Device Role / Timing Role: Constant-current switch regulating LED forward current via base-resistor biasing. Use Value: Supports up to 500 mA peak current per channel, enabling high-brightness LED operation without external current regulators.

Audio Preamp Stage

Discrete Logic Level Shifter

Use Scenario: Amplifying weak microphone or sensor signals prior to ADC sampling in embedded audio recorders.

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

Use Value: Delivers stable 20–200× voltage gain with low distortion at <100 µA quiescent current, leveraging its h_FE consistency and low C_ob.

Use Scenario: Converting 3.3 V logic outputs to drive 5 V TTL-compatible inputs in mixed-voltage microcontroller systems.

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

Use Value: Achieves reliable turn-on with I_B ≥ 100 µA and full saturation at I_C ≤ 300 mA, avoiding logic misreads due to incomplete switching.

DC Motor Speed Control

LED Driver for Indicator Panels

Use Scenario: PWM-driven low-power DC motor (e.g., cooling fan or actuator) in HVAC control boards.

IC Role / Device Role / Timing Role: Low-side switching element modulating average current through motor winding.

Use Value: Handles 300 mA continuous coil current with <1 V saturation voltage (V_CE(sat) not explicitly listed but typical for family), minimizing heat generation.

Use Scenario: Driving multi-color status LEDs on industrial HMI panels requiring independent brightness control.

IC Role / Device Role / Timing Role: Constant-current switch regulating LED forward current via base-resistor biasing.

Use Value: Supports up to 500 mA peak current per channel, enabling high-brightness LED operation without external current regulators.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
PN2222A	V_CEO = 40 V, h_FE = 100–300, P_D = 625 mW, same TO-92 package	Higher voltage rating allows use in 24 V systems where 2N3393 would be marginal	Select PN2222A when V_CC > 25 V or higher h_FE consistency is required.
BC547B	V_CEO = 45 V, h_FE = 200–450, P_D = 500 mW, TO-92 package	Higher gain and voltage rating but lower power dissipation; not drop-in for >500 mW loads	Choose BC547B for low-noise, low-current signal amplification where thermal margin is less critical.

Compared with 2N3393, PN2222A offers higher breakdown voltage and broader h_FE range while maintaining identical footprint and thermal profile; BC547B delivers superior small-signal gain but reduced power handling, making it better suited for preamp front-ends than power-switching roles.

Availability

2N3393 is available at Aetrix Electronics and suitable for audio preamplifiers, discrete logic level shifters, and LED indicator drivers requiring stable component supply across long-lifecycle industrial programs.

Supply support for 2N3393 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

Fairchild Semiconductor was a U.S.-based semiconductor manufacturer specializing in analog, discrete, and power management ICs before its acquisition by ON Semiconductor in 2016.

The 2N3393 belongs to Fairchild's legacy "2N" series of general-purpose bipolar transistors, engineered for cost-sensitive, high-reliability linear and switching functions in consumer, industrial, and instrumentation equipment.

FAQ

What is the maximum collector-emitter voltage rating for the 2N3393?

The 2N3393 has a maximum collector-emitter voltage (V_CEO) rating of 25 V at T_A = 25 °C. This value is absolute - exceeding it risks avalanche breakdown and permanent device failure. Designers must ensure worst-case supply rails and transient spikes remain below this threshold, especially in inductive load switching applications where flyback voltages may occur. The 2N3393 is not rated for 30 V or higher operation.

Does the 2N3393 have a specified noise figure?

No, the 2N3393 does not have a published noise figure. The datasheet specifies NF = 5.0 dB only for the 2N3391A variant under defined test conditions (V_CE = 4.5 V, I_C = 100 µA, R_G = 500 Ω, BW = 15.7 kHz). No noise performance data is provided for the 2N3393, so it should not be selected for low-noise preamplifier stages unless empirically characterized.

What is the DC current gain (h_FE) range for the 2N3393?

The 2N3393 has a DC current gain (h_FE) range of 90 to 180 when measured at V_CE = 4.5 V and I_C = 2.0 mA. This is lower than earlier variants in the family (e.g., 2N3390: 400–800), reflecting intentional binning for cost-optimized, medium-gain applications. Designers must size base resistors assuming minimum h_FE = 90 to guarantee saturation in switching use cases.

Is the 2N3393 pin-compatible with other 2N339x transistors?

Yes, the 2N3393 shares identical TO-92 pinout (E-C-B, flat side facing viewer) and mechanical dimensions with 2N3390, 2N3391, 2N3391A, and 2N3392. However, electrical parameters differ significantly - especially h_FE, V_(BR)CEO, and small-signal gain - so substitution requires verification of gain, voltage, and thermal margins in the target circuit. The 2N3393 is not a functional drop-in replacement without analysis.

What is the thermal resistance from junction to ambient for the 2N3393?

The 2N3393 has a junction-to-ambient thermal resistance (R_θJA) of 200 °C/W under standard PCB mounting conditions (single-layer board, no copper pour). This means a 312.5 mW power dissipation will raise junction temperature by 62.5 °C above ambient. For reliable operation near maximum ratings, designers should verify actual board layout thermal performance or add copper area to reduce effective R_θJA.

2N3393 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 500 mA

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

Vce Saturation (Max) @ Ib, Ic:: -

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 90 @ 2mA, 4.5V

Power - Max:: 625 mW

Frequency - Transition:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

2N3393 FAQ

1.How can I place an order for 2N3393 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N3393 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 2N3393 reliable?

The price and inventory of 2N3393 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N3393 is usually 5 days.

3.What payment methods are accepted for 2N3393?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N3393 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N3393?

2N3393 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N3393 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 2N3393?

For technical support, including 2N3393 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N3393 requirements.

6.How does Aetrix verify that 2N3393 is sourced from the original manufacturer or authorized distributors?

All 2N3393 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 2N3393 meets industry standards.

7.What is the process for return or replacement of 2N3393?

All 2N3393 units undergo pre-shipment inspection (PSI). If there is an issue with 2N3393, 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 2N3393 part is unused and in its original packaging.

Return procedure for 2N3393:

1.Submit a request within 90 days.

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

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