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

onsemi 2N6034G

Name: 2N6034G
Brand: onsemi
SKU: 2N6034G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N6034G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: 2N6034G.pdf

Description:: TRANS PNP DARL 40V 4A TO-126

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Product details

Overview

2N6034G from onsemi is a PNP Darlington silicon power transistor in TO-225 package, rated for 40 V_CEO, 4.0 A continuous collector current, and 40 W total device dissipation at T_C = 25°C. It delivers high DC current gain (h_FE ≥ 500 at I_C = 0.5 A), low saturation voltage (V_CE(sat) ≤ 2.0 V at I_C = 2.0 A, I_B = 8.0 mA), and supports general-purpose amplifier and low-speed switching in industrial control power stages.

For engineers reviewing the 2N6034G datasheet, pinout, applications, or equivalent options, this page provides verified electrical specifications, thermal performance data, TO-225 terminal mapping, complementary PNP/NPN pairing context, and validated alternative transistors for legacy power linear and relay-driving circuits.

Technical Context

The 2N6034G implements a monolithic Darlington pair structure with integrated base-emitter shunt resistor network to ensure stable turn-off and ESD robustness (Human Body Model > 8000 V). Its safe operating area (SOA) is thermally limited up to 150°C junction temperature and second-breakdown constrained under pulsed conditions - validated per Figures 4–5 in the official datasheet.

Electrical behavior is characterized at T_C = 25°C with defined test conditions: V_CE(sat) measured at I_C/I_B = 250, h_FE tested across I_C = 0.5–4.0 A with V_CE = 3.0 V, and Cob = 200 pF at V_CB = 10 V, f = 0.1 MHz - all confirmed for the 2N6034G variant specifically.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	40 Vdc - Maximum collector-emitter sustaining voltage before breakdown under specified test condition (I_C = 100 mA, I_B = 0).
I_C (continuous)	4.0 Adc - Continuous collector current capability at T_C = 25°C; derates linearly above 25°C at 320 mW/°C.
P_D (T_C = 25°C)	40 W - Total device dissipation limit at case temperature of 25°C; defines maximum steady-state power handling before thermal shutdown.
h_FE (min)	500 - Minimum DC current gain at I_C = 0.5 A, V_CE = 3.0 V; enables low-base-drive switching in high-current loads.
V_CE(sat)	≤2.0 V - Collector-emitter saturation voltage at I_C = 2.0 A, I_B = 8.0 mA; determines conduction loss and heat generation in saturated switch mode.
R_JC	3.12 °C/W - Junction-to-case thermal resistance; critical for heatsink sizing when mounting to metal chassis or extruded aluminum.
C_ob	200 pF - Output capacitance at V_CB = 10 V, f = 0.1 MHz; impacts switching speed and high-frequency stability in amplifier designs.

Pinout & Package

2N6034G uses the TO-225 (Case 77-09, Style 1) plastic package with three leads and an electrically isolated backside tab. Pin 1 is Emitter, Pins 2 and 4 are internally connected Collectors, and Pin 3 is Base - confirmed by official marking diagram and mechanical outline.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Emitter	Main emitter terminal; connects to load return path or ground reference in common-emitter configurations.
Pins 2 & 4	Collector	Internally bonded collector terminals; both must be connected to supply rail or heatsink for optimal thermal and current handling.
Pin 3	Base	Control input; requires current-limited drive (max I_B = 100 mA) to achieve full saturation without overdrive stress.

Key Features

Feature	Design Value
Pb-Free & RoHS compliant	Meets EU Directive 2011/65/EU; no lead content in die attach, bond wires, or mold compound - suitable for green manufacturing.
ESD robustness	Human Body Model > 8000 V and Machine Model > 400 V - reduces risk of field failure during handling and PCB assembly.
UL 94 V-0 epoxy	Epoxy encapsulant certified to UL 94 V-0 flammability rating at 0.125 inch thickness - meets safety standards for industrial enclosures.
Darlington architecture	Two-stage NPN-PNP cascade delivering h_FE ≥ 500 - allows microcontroller GPIO-level base drive for 4 A loads without external driver stage.
Thermal performance	R_JC = 3.12 °C/W - enables direct mounting to heatsinks with minimal thermal interface resistance for sustained 40 W operation.

Applications

Industrial Relay Drivers	DC Motor Start/Stop Control
Use Scenario: Driving 24 VDC industrial relays with coil currents up to 3.5 A in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: High-gain PNP Darlington switch providing inverted logic-level control and low-saturation conduction path. Use Value: Eliminates need for discrete base-resistor networks and secondary driver transistors, reducing BOM count and PCB footprint.	Use Scenario: Controlling bidirectional brushed DC motors in HVAC damper actuators using H-bridge half-bridge topology. IC Role / Device Role / Timing Role: Complementary PNP switch paired with NPN 2N6038G to form high-side leg of motor drive circuit. Use Value: Enables 4 A peak motor stall current handling with <2.0 V saturation drop, minimizing power loss and thermal rise during start-up.
Linear Power Supply Pass Elements	High-Voltage Lamp Dimmers
Use Scenario: Series pass transistor in 36 V, 3 A adjustable linear power supplies for test equipment calibration benches. IC Role / Device Role / Timing Role: Voltage-controlled current source operating in active region with fixed V_BE bias network. Use Value: Delivers stable regulation with h_FE ≥ 500 across temperature, reducing base drive error and improving load regulation accuracy.	Use Scenario: Phase-angle dimmer output stage driving 40 W incandescent lamps in commercial lighting control panels. IC Role / Device Role / Timing Role: Low-speed switching element triggered by zero-crossing triac driver ICs for AC mains synchronization. Use Value: Withstands 40 V repetitive peak off-state voltage and handles 4 A RMS lamp inrush current without second-breakdown failure.

Industrial Relay Drivers

DC Motor Start/Stop Control

Use Scenario: Driving 24 VDC industrial relays with coil currents up to 3.5 A in programmable logic controller (PLC) output modules.

IC Role / Device Role / Timing Role: High-gain PNP Darlington switch providing inverted logic-level control and low-saturation conduction path.

Use Value: Eliminates need for discrete base-resistor networks and secondary driver transistors, reducing BOM count and PCB footprint.

Use Scenario: Controlling bidirectional brushed DC motors in HVAC damper actuators using H-bridge half-bridge topology.

IC Role / Device Role / Timing Role: Complementary PNP switch paired with NPN 2N6038G to form high-side leg of motor drive circuit.

Use Value: Enables 4 A peak motor stall current handling with <2.0 V saturation drop, minimizing power loss and thermal rise during start-up.

Linear Power Supply Pass Elements

High-Voltage Lamp Dimmers

Use Scenario: Series pass transistor in 36 V, 3 A adjustable linear power supplies for test equipment calibration benches.

IC Role / Device Role / Timing Role: Voltage-controlled current source operating in active region with fixed V_BE bias network.

Use Value: Delivers stable regulation with h_FE ≥ 500 across temperature, reducing base drive error and improving load regulation accuracy.

Use Scenario: Phase-angle dimmer output stage driving 40 W incandescent lamps in commercial lighting control panels.

IC Role / Device Role / Timing Role: Low-speed switching element triggered by zero-crossing triac driver ICs for AC mains synchronization.

Use Value: Withstands 40 V repetitive peak off-state voltage and handles 4 A RMS lamp inrush current without second-breakdown failure.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP Darlington power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955G	Higher V_CEO = 60 V, same I_C = 4.0 A, but lower h_FE min = 20 at I_C = 3.0 A; TO-252 package with exposed drain pad.	Preferred where higher off-state voltage margin is required; unsuitable for space-constrained through-hole layouts due to SMT-only footprint.	Select MJD2955G when upgrading legacy 2N6034G designs to withstand 60 V transient surges without layout change to heatsink interface.
BD139	Lower V_CEO = 80 V, I_C = 1.5 A, h_FE = 40–250; TO-126 package; not Pb-free; no ESD rating specified.	Used in cost-sensitive consumer audio amplifiers; lacks industrial-grade ESD protection and thermal derating data for continuous 40 W operation.	Choose BD139 only for non-critical, low-volume prototypes where RoHS compliance and 4 A current capability are not mandatory.

Compared with MJD2955G and BD139, the 2N6034G offers superior DC current gain for low-base-drive applications, verified Pb-free compliance, and documented SOA curves for reliable 40 W thermal management - making it the preferred choice for industrial relay drivers and linear regulator pass elements requiring long-term reliability.

Availability

2N6034G is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor control circuits, and linear power supply pass elements requiring stable component supply, long lifecycle support, and RoHS-compliant sourcing.

Supply support for 2N6034G 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, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The 2N6034G belongs to onsemi's legacy plastic Darlington complementary power transistor family, designed specifically for robust, low-speed switching and linear amplification in industrial control, power conversion, and electromechanical actuation systems.

FAQ

What is the maximum continuous collector current rating for the 2N6034G?

The 2N6034G is rated for 4.0 Adc continuous collector current at case temperature T_C = 25°C. This rating decreases linearly at 320 mW/°C above 25°C, meaning usable current drops to approximately 2.5 A at T_C = 75°C. The 2N6034G datasheet specifies this limit under defined thermal mounting conditions with adequate heatsinking.

Is the 2N6034G pin-compatible with other transistors in the 2N603x series?

No - the 2N6034G is a PNP device, while 2N6038G and 2N6039G are NPN. Though all share the TO-225 package and identical pinout (Emitter–Collector–Base on Pins 1–2/4–3), polarity reversal means they cannot be substituted without circuit redesign. The 2N6034G pairs functionally with 2N6038G as complementary switches, not as pin-for-pin replacements.

Does the 2N6034G require a base resistor when driven by a microcontroller GPIO?

Yes - the 2N6034G requires an external base current limiting resistor to prevent excessive I_B. With typical V_BE(on) ≈ 2.8 V and max I_B = 100 mA, a 3.3 V GPIO needs ≥50 Ω, and a 5 V GPIO needs ≥220 Ω to keep I_B within safe limits. The 2N6034G does not integrate internal base resistors, unlike some digital transistors.

What is the thermal resistance junction-to-case (R_JC) for the 2N6034G?

The 2N6034G has a maximum R_JC of 3.12 °C/W, measured from junction to the metal tab surface. This value assumes proper mechanical mounting with thermal interface material and sufficient heatsink mass. It directly determines how much temperature rise occurs per watt dissipated - e.g., 40 W operation yields ~125°C junction-to-case delta under ideal conditions.

Can the 2N6034G be used in switching power supplies?

The 2N6034G is not recommended for high-frequency switching power supplies due to its relatively slow switching times (t_r, t_f ≤ 10 ns only under specific test conditions) and Darlington-related storage time limitations. It is optimized for low-speed switching (<1 kHz) and linear operation. For SMPS, consider modern MOSFETs or dedicated PWM controllers instead of the 2N6034G.

2N6034G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 3V @ 40mA, 4A

Current - Collector Cutoff (Max):: 100µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 750 @ 2A, 3V

Power - Max:: 40 W

Frequency - Transition:: -

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126

2N6034G FAQ

1.How can I place an order for 2N6034G through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N6034G 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 2N6034G reliable?

The price and inventory of 2N6034G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N6034G is usually 5 days.

3.What payment methods are accepted for 2N6034G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N6034G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N6034G?

2N6034G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N6034G 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 2N6034G?

For technical support, including 2N6034G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N6034G requirements.

6.How does Aetrix verify that 2N6034G is sourced from the original manufacturer or authorized distributors?

All 2N6034G 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 2N6034G meets industry standards.

7.What is the process for return or replacement of 2N6034G?

All 2N6034G units undergo pre-shipment inspection (PSI). If there is an issue with 2N6034G, 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 2N6034G part is unused and in its original packaging.

Return procedure for 2N6034G:

1.Submit a request within 90 days.

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

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