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

onsemi 2N3415_D75Z

Name: 2N3415_D75Z
Brand: onsemi
SKU: 2N3415_D75Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N3415_D75Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2N3415_D75Z.pdf

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

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Product details

Overview

2N3415_D75Z from Fairchild Semiconductor is an NPN general-purpose bipolar junction transistor (BJT) designed for amplification and switching in low-to-medium power circuits, with a continuous collector current rating of 500 mA, V_CEO = 25 V, and DC current gain (h_FE) ranging from 180 to 540 at I_C = 2.0 mA. It is commonly used in audio preamplifiers, relay drivers, and signal conditioning stages.

For engineers reviewing the 2N3415_D75Z datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92 package thermal resistance (R_θJA = 200 °C/W), saturation voltage (V_CE(sat) ≤ 0.3 V at I_C = 50 mA), and guaranteed h_FE range across production lots.

Technical Context

The 2N3415_D75Z operates as a silicon NPN BJT fabricated using Fairchild's Process 10, optimized for stable DC current gain and low saturation voltage. Its breakdown ratings-V_CEO, V_CBO, and V_EBO-are all specified at 25 V, 25 V, and 5.0 V respectively, supporting reliable operation in 5–24 V logic-level and analog interface circuits.

Thermal design is constrained by R_θJA = 200 °C/W and P_D = 625 mW at T_A = 25°C, with linear derating of 5.0 mW/°C above ambient. Junction temperature must remain within –55°C to +150°C for rated performance and reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	25 V - Maximum safe collector-emitter voltage before breakdown under open-base conditions
I_C (continuous)	500 mA - Sustained collector current capability without thermal runaway in TO-92 package
h_FE	180–540 - DC current gain range at V_CE = 4.5 V, I_C = 2.0 mA; enables predictable biasing in Class-A amplifiers
V_CE(sat)	≤ 0.3 V - Low saturation voltage at I_C = 50 mA / I_B = 3.0 mA; minimizes power loss in switching applications
R_θJA	200 °C/W - Thermal resistance from junction to ambient; defines maximum allowable power dissipation at given ambient temperature
T_J range	–55°C to +150°C - Operating junction temperature window; supports industrial and automotive under-hood environments

Pinout & Package

Package: TO-92 - Molded plastic case with 3 leads, standardized for through-hole mounting and manual prototyping; lead spacing matches JEDEC TO-92 outline.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Reference node for base-emitter biasing; connects to ground or low-impedance return path in common-emitter configurations
Base (B)	Control input	Receives forward-biased current to drive transistor into active or saturation region; requires current-limiting resistor in digital switch designs
Collector (C)	Current source terminal	Delivers amplified output current; connects to load (e.g., relay coil, LED, or next-stage input) in standard amplifier or switch topologies

Key Features

Feature	Design Value
Guaranteed h_FE range	180–540 at I_C = 2.0 mA - Enables consistent DC bias point setting without individual device trimming
Low V_CE(sat)	≤ 0.3 V - Reduces conduction losses in high-duty-cycle switching, improving efficiency in driver stages
High V_CEO/V_CBO	25 V - Supports operation across 12 V and 24 V systems without external clamping components
TO-92 mechanical standardization	JEDEC-compliant footprint - Ensures compatibility with legacy PCB layouts, breadboards, and hand-soldering workflows

Applications

Audio Preamp Stage	Relay Driver Circuit
Use Scenario: Amplifying weak microphone or sensor signals prior to ADC sampling in embedded audio interfaces. IC Role / Device Role / Timing Role: NPN BJT configured in common-emitter topology to provide voltage gain and impedance transformation. Use Value: Stable h_FE range ensures repeatable gain calibration; low noise performance supports SNR > 65 dB in mid-band audio (300 Hz–3 kHz).	Use Scenario: Driving electromagnetic relays in programmable logic controllers (PLCs) and industrial I/O modules. IC Role / Device Role / Timing Role: Switching element that sinks relay coil current when base is asserted by microcontroller GPIO. Use Value: V_CE(sat) ≤ 0.3 V limits power dissipation to < 15 mW at 50 mA, eliminating need for heatsinking in compact enclosures.
LED Current Regulator	Signal Level Shifter
Use Scenario: Providing constant-current drive for indicator LEDs in panel-mounted instrumentation. IC Role / Device Role / Timing Role: Emitter-follower configured BJT with emitter resistor to set precise LED current independent of supply variation. Use Value: Tight h_FE distribution allows ±5% current accuracy without feedback; TO-92 package fits dense front-panel layouts.	Use Scenario: Translating 3.3 V logic outputs to 5 V or 12 V compatible levels for legacy peripherals. IC Role / Device Role / Timing Role: Active pull-up switch enabling bidirectional level translation in open-collector bus interfaces. Use Value: V_EBO = 5.0 V and low C_ob support clean edge transitions up to 1 MHz without added capacitance or delay.

Audio Preamp Stage

Relay Driver Circuit

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

IC Role / Device Role / Timing Role: NPN BJT configured in common-emitter topology to provide voltage gain and impedance transformation.

Use Value: Stable h_FE range ensures repeatable gain calibration; low noise performance supports SNR > 65 dB in mid-band audio (300 Hz–3 kHz).

Use Scenario: Driving electromagnetic relays in programmable logic controllers (PLCs) and industrial I/O modules.

IC Role / Device Role / Timing Role: Switching element that sinks relay coil current when base is asserted by microcontroller GPIO.

Use Value: V_CE(sat) ≤ 0.3 V limits power dissipation to < 15 mW at 50 mA, eliminating need for heatsinking in compact enclosures.

LED Current Regulator

Signal Level Shifter

Use Scenario: Providing constant-current drive for indicator LEDs in panel-mounted instrumentation.

IC Role / Device Role / Timing Role: Emitter-follower configured BJT with emitter resistor to set precise LED current independent of supply variation.

Use Value: Tight h_FE distribution allows ±5% current accuracy without feedback; TO-92 package fits dense front-panel layouts.

Use Scenario: Translating 3.3 V logic outputs to 5 V or 12 V compatible levels for legacy peripherals.

IC Role / Device Role / Timing Role: Active pull-up switch enabling bidirectional level translation in open-collector bus interfaces.

Use Value: V_EBO = 5.0 V and low C_ob support clean edge transitions up to 1 MHz without added capacitance or delay.

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
2N2222A	Higher V_CEO (40 V), lower max h_FE (100–300), same TO-92 package	Better suited for higher-voltage switching (e.g., 36 V automotive loads); less gain margin for low-signal amplification	Select 2N2222A when V_CC exceeds 25 V but h_FE stability below 200 is acceptable
BC547B	Lower I_C (100 mA), higher h_FE (200–450), same TO-92 footprint	Optimized for low-power signal amplification only; not rated for 500 mA switching loads	Choose BC547B for battery-powered sensor interfaces where gain consistency matters more than current drive

Compared with 2N3415_D75Z, the 2N2222A offers greater voltage headroom but reduced gain control, while the BC547B delivers tighter h_FE tolerance at the cost of current capability-making 2N3415_D75Z the balanced choice for 24 V, medium-current analog/digital hybrid circuits.

Availability

2N3415_D75Z is available at Aetrix Electronics and suitable for audio preamplifiers, relay drivers, and LED current regulators requiring stable component supply across industrial control, test equipment, and embedded instrumentation programs.

Supply support for 2N3415_D75Z 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 company specializing in power management, analog, and discrete devices, acquired by ON Semiconductor in 2016. Its legacy BJT portfolio remains widely deployed in industrial and consumer electronics.

The 2N3415_D75Z belongs to Fairchild's general-purpose NPN transistor family, engineered for robustness and repeatability in analog amplification and medium-current switching-targeting cost-sensitive, high-reliability applications where TO-92 form factor and proven process stability are critical.

FAQ

What is the maximum continuous collector current rating for the 2N3415_D75Z?

The 2N3415_D75Z has a maximum continuous collector current (I_C) rating of 500 mA at T_A = 25°C. This rating assumes proper thermal management; actual usable current decreases with rising ambient temperature due to its 5.0 mW/°C derating slope and R_θJA = 200 °C/W. Exceeding this limit risks thermal runaway or permanent degradation of the 2N3415_D75Z.

Does the 2N3415_D75Z have a specified h_FE range, and how is it tested?

Yes, the 2N3415_D75Z specifies a DC current gain (h_FE) range of 180 to 540, measured at V_CE = 4.5 V and I_C = 2.0 mA per the official Fairchild datasheet. This range reflects production lot variation and ensures predictable biasing in amplifier and switch designs without requiring post-manufacture sorting. The 2N3415_D75Z meets this specification under standard test conditions defined in the datasheet.

Can the 2N3415_D75Z be used in switching applications, and what is its typical V_CE(sat)?

Yes, the 2N3415_D75Z is explicitly qualified for switching use, with a typical V_CE(sat) of ≤ 0.3 V when I_C = 50 mA and I_B = 3.0 mA. This low saturation voltage minimizes power loss during on-state operation, making the 2N3415_D75Z suitable for driving relays, LEDs, and small solenoids in industrial control and instrumentation systems.

What is the package type and pin configuration of the 2N3415_D75Z?

The 2N3415_D75Z uses the industry-standard TO-92 plastic package with three leads arranged in emitter-base-collector (E-B-C) order when viewed with flat side facing outward and leads pointing down. This pinout is confirmed in the Fairchild Rev B datasheet and aligns with JEDEC TO-92 mechanical specifications, ensuring compatibility with existing footprints and assembly processes for the 2N3415_D75Z.

Is the 2N3415_D75Z suitable for automotive or extended temperature applications?

The 2N3415_D75Z supports an operating junction temperature range of –55°C to +150°C, meeting requirements for under-hood and industrial environments. However, it is not AEC-Q101 qualified, so while the 2N3415_D75Z can function reliably in non-safety-critical automotive subsystems (e.g., cabin lighting, HVAC controls), formal automotive qualification requires additional validation per system-level standards.

2N3415_D75Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Transistor Type:: NPN

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

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

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 3mA, 50mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 180 @ 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

2N3415_D75Z FAQ

1.How can I place an order for 2N3415_D75Z through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N3415_D75Z 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 2N3415_D75Z reliable?

The price and inventory of 2N3415_D75Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N3415_D75Z is usually 5 days.

3.What payment methods are accepted for 2N3415_D75Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N3415_D75Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N3415_D75Z?

2N3415_D75Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N3415_D75Z 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 2N3415_D75Z?

For technical support, including 2N3415_D75Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N3415_D75Z requirements.

6.How does Aetrix verify that 2N3415_D75Z is sourced from the original manufacturer or authorized distributors?

All 2N3415_D75Z 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 2N3415_D75Z meets industry standards.

7.What is the process for return or replacement of 2N3415_D75Z?

All 2N3415_D75Z units undergo pre-shipment inspection (PSI). If there is an issue with 2N3415_D75Z, 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 2N3415_D75Z part is unused and in its original packaging.

Return procedure for 2N3415_D75Z:

1.Submit a request within 90 days.

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

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