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

onsemi 2N3704_D75Z

Name: 2N3704_D75Z
Brand: onsemi
SKU: 2N3704_D75Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N3704_D75Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2N3704_D75Z.pdf

Description:: TRANS NPN 30V 0.5A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2N3704_D75Z from Fairchild Semiconductor is an NPN epitaxial silicon transistor designed for general-purpose amplification and switching up to 300mA collector current, with V_CEO = 30V, h_FE = 100–300 at I_C = 50mA, and f_T = 100MHz - used in low-voltage audio preamplifiers and digital logic interface stages.

For engineers reviewing the 2N3704_D75Z datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain consistency across temperature, saturation voltage under 1.0V at I_C/I_B = 20, and TO-92 thermal resistance of 200°C/W for ambient-limited linear operation.

Technical Context

This discrete NPN bipolar junction transistor operates in active, saturation, and cutoff regions with verified DC gain linearity from 1mA to 100mA. Its 100MHz f_T supports small-signal amplification up to mid-VHF, while V_CE(sat) ≤ 1.0V at I_C = 100mA / I_B = 5mA enables efficient low-side switching in 5V logic-controlled loads.

Thermal design relies on R_θJA = 200°C/W in free-air TO-92 mounting; maximum continuous power dissipation is 625mW at T_A = 25°C, derating 5.0mW/°C above that. Junction temperature must remain ≤150°C per absolute maximum rating.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration
h_FE	100–300 - DC current gain range at V_CE = 5V, I_C = 50mA, defining base drive sizing margin
V_CE(sat)	0.5–1.0V - collector-emitter voltage drop in saturation, directly impacting switch conduction loss
f_T	100MHz - transition frequency where \|h_fe\| = 1, limiting usable bandwidth in RF amplifier stages
R_θJA	200°C/W - junction-to-ambient thermal resistance in standard TO-92 mounting, governing heatsinking requirements
P_D	625mW - maximum steady-state power dissipation at 25°C ambient, critical for linear amplifier bias design

Pinout & Package

2N3704_D75Z is housed in a through-hole TO-92 package (JEDEC TO-92 variant), with standardized lead orientation: Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base. Package dimensions conform to Fairchild Rev. B specification: body height 4.58±0.20mm, lead spacing 1.27±0.20mm, and overall length 14.47±0.40mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path in NPN configuration	Connected to ground or low-impedance return; determines emitter degeneration resistor placement
2 (Collector)	Current entry path under forward-active bias	Drives load or next stage; requires voltage headroom ≥ V_CEO and heatsink if P_D > 300mW
3 (Base)	Control terminal for minority-carrier injection	Receives current-limited drive; base resistor value set by h_FE min and required I_C

Key Features

Feature	Design Value
NPN epitaxial construction	Enables stable h_FE and low leakage (I_CBO ≤ 100nA) across -55°C to +150°C operating range
100MHz transition frequency	Supports amplification of signals up to ~10MHz with usable gain, suitable for IF and audio-frequency stages
V_CE(sat) ≤ 1.0V @ I_C/I_B = 20	Reduces conduction loss in switching applications, enabling efficient 5V-tolerant digital output buffering
TO-92 mechanical standardization	Ensures compatibility with legacy PCB footprints, wave-soldering fixtures, and hand-soldering tooling

Applications

Audio Preamp Stage	Digital Logic Level Shifter
Use Scenario: Amplifying microphone-level signals (1–10mV) to line-level (0.3–1V) in battery-powered portable recorders. IC Role / Device Role / Timing Role: Small-signal NPN amplifier in common-emitter configuration with emitter degeneration. Use Value: h_FE ≥ 100 ensures sufficient gain stability across production lots and temperature; f_T = 100MHz avoids high-frequency roll-off in 20kHz audio band.	Use Scenario: Converting 3.3V CMOS logic outputs to drive 5V TTL-compatible inputs in mixed-voltage microcontroller systems. IC Role / Device Role / Timing Role: Active-low level-shifting switch with base driven by MCU GPIO. Use Value: V_CE(sat) ≤ 1.0V guarantees output low < 0.8V at 5V rail, meeting TTL input threshold; TO-92 allows manual prototyping without SMT rework.
Low-Power Relay Driver	Current Mirror Reference
Use Scenario: Switching 12V/100mA electromechanical relays from 5V microcontroller outputs in industrial control panels. IC Role / Device Role / Timing Role: Low-side saturated switch with base resistor network limiting I_B to ensure I_C ≥ 100mA. Use Value: Verified V_CEO = 30V provides 1.5× margin over 12V relay coil flyback spikes; R_θJA = 200°C/W permits continuous duty without heatsink at ambient ≤ 40°C.	Use Scenario: Building matched current sources in analog sensor signal conditioning circuits requiring <5% current error. IC Role / Device Role / Timing Role: Transistor pair in monolithic or discrete current mirror topology with emitter resistors. Use Value: Tight h_FE spread (100–300) and low I_CBO (≤100nA) minimize ratio error and temperature drift in precision mirror configurations.

Audio Preamp Stage

Digital Logic Level Shifter

Use Scenario: Amplifying microphone-level signals (1–10mV) to line-level (0.3–1V) in battery-powered portable recorders.

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

Use Value: h_FE ≥ 100 ensures sufficient gain stability across production lots and temperature; f_T = 100MHz avoids high-frequency roll-off in 20kHz audio band.

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

IC Role / Device Role / Timing Role: Active-low level-shifting switch with base driven by MCU GPIO.

Use Value: V_CE(sat) ≤ 1.0V guarantees output low < 0.8V at 5V rail, meeting TTL input threshold; TO-92 allows manual prototyping without SMT rework.

Low-Power Relay Driver

Current Mirror Reference

Use Scenario: Switching 12V/100mA electromechanical relays from 5V microcontroller outputs in industrial control panels.

IC Role / Device Role / Timing Role: Low-side saturated switch with base resistor network limiting I_B to ensure I_C ≥ 100mA.

Use Value: Verified V_CEO = 30V provides 1.5× margin over 12V relay coil flyback spikes; R_θJA = 200°C/W permits continuous duty without heatsink at ambient ≤ 40°C.

Use Scenario: Building matched current sources in analog sensor signal conditioning circuits requiring <5% current error.

IC Role / Device Role / Timing Role: Transistor pair in monolithic or discrete current mirror topology with emitter resistors.

Use Value: Tight h_FE spread (100–300) and low I_CBO (≤100nA) minimize ratio error and temperature drift in precision mirror configurations.

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
BC547B	Higher h_FE range (200–450), lower V_CEO (45V), same TO-92 package	Preferred in higher-gain, lower-current (<50mA) linear amplifiers; less robust for 100mA switching	Select BC547B when gain stability at low I_C is prioritized over saturation performance at high current
MPS2222A	Higher P_D (1W), higher I_C (600mA), same V_CEO (30V), TO-92 compatible but larger footprint	Suitable for higher-power switching (e.g., solenoid drivers); requires PCB layout adjustment	Choose MPS2222A only when 2N3704_D75Z thermal limits are exceeded and board space allows larger TO-92 variant

Compared with BC547B and MPS2222A, 2N3704_D75Z offers balanced gain-bandwidth-thermal trade-offs for cost-sensitive, medium-current (50–100mA) linear and switching roles where strict TO-92 footprint compliance and predictable V_CE(sat) are primary constraints.

Availability

2N3704_D75Z is available at Aetrix Electronics and suitable for audio preamplifiers, digital logic level shifters, and low-power relay drivers requiring stable component supply and long-term obsolescence management.

Supply support for 2N3704_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 manufacturer specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.

The 2N3704_D75Z belongs to Fairchild's legacy general-purpose bipolar transistor product line, engineered for reliability in consumer, industrial, and educational electronics where proven performance and manufacturability outweigh cutting-edge specs.

FAQ

What is the maximum collector current rating for 2N3704_D75Z?

The 2N3704_D75Z has a continuous collector current rating of 500mA per Absolute Maximum Ratings, though its typical use case targets ≤300mA for reliable operation within thermal limits. At I_C = 100mA, V_CE(sat) remains ≤1.0V, and junction temperature stays within 150°C with proper ambient management. Always verify actual power dissipation using P = V_CE × I_C + V_BE × I_B in your circuit.

Does 2N3704_D75Z have a documented h_FE range at low collector currents?

Yes, the 2N3704_D75Z datasheet specifies h_FE = 100–300 at V_CE = 5.0V and I_C = 50mA. While no official minimum is given at I_C < 10mA, typical curves show h_FE ≥ 70 down to 1mA, making it usable in low-current amplifier and detector applications. For guaranteed low-I_C gain, consult Fairchild's PN100 reference device.

Can 2N3704_D75Z be used in switching power supply feedback circuits?

No - the 2N3704_D75Z is not recommended for switching power supply feedback due to lack of specified fast-switching parameters (e.g., t_on/t_off, storage time) and limited f_T margin above 100kHz. Its design targets audio and low-speed digital applications. For SMPS optocoupler drivers or error amplifiers, consider purpose-built transistors like PC817X or TL431-based solutions instead of 2N3704_D75Z.

What is the emitter-base breakdown voltage of 2N3704_D75Z?

The emitter-base breakdown voltage (V_EBO) of 2N3704_D75Z is 5.0V, measured at I_E = 100µA with collector open. This limits base drive voltage to ≤4.5V in normal operation to avoid damaging the BE junction. Exceeding this rating risks permanent degradation of h_FE and increased leakage; always include a series base resistor to constrain I_B during turn-on transients.

Is 2N3704_D75Z RoHS compliant?

The original 2N3704_D75Z was manufactured prior to RoHS enforcement and contains leaded solder in its TO-92 package. Modern RoHS-compliant equivalents (e.g., MMBT3704) exist but differ in packaging and qualification. If RoHS compliance is mandatory, confirm material declarations with Aetrix Electronics' latest shipment documentation or request certified test reports for the specific lot of 2N3704_D75Z you intend to procure.

2N3704_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):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 5mA, 100mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 50mA, 5V

Power - Max:: 625 mW

Frequency - Transition:: 100MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

2N3704_D75Z FAQ

1.How can I place an order for 2N3704_D75Z through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N3704_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 2N3704_D75Z reliable?

The price and inventory of 2N3704_D75Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N3704_D75Z is usually 5 days.

3.What payment methods are accepted for 2N3704_D75Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N3704_D75Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N3704_D75Z?

2N3704_D75Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N3704_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 2N3704_D75Z?

For technical support, including 2N3704_D75Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N3704_D75Z requirements.

6.How does Aetrix verify that 2N3704_D75Z is sourced from the original manufacturer or authorized distributors?

All 2N3704_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 2N3704_D75Z meets industry standards.

7.What is the process for return or replacement of 2N3704_D75Z?

All 2N3704_D75Z units undergo pre-shipment inspection (PSI). If there is an issue with 2N3704_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 2N3704_D75Z part is unused and in its original packaging.

Return procedure for 2N3704_D75Z:

1.Submit a request within 90 days.

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

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