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onsemi 2N6045
- Part No.:
- 2N6045
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
2N6045.pdf
- Description:
- TRANS NPN DARL 100V 8A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:8,233
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Product details
Overview
2N6045 from onsemi is an NPN Darlington power transistor in TO-220 package, designed for medium-power linear amplification and low-speed switching. It delivers 8 A continuous collector current, sustains 100 V collector-emitter voltage (VCEO(sus)), and achieves DC current gain (hFE) up to 20,000 at IC = 3.0 A - enabling high-current drive with minimal base drive in industrial motor controls and relay drivers.
For engineers reviewing the 2N6045 datasheet, pinout, applications, or equivalent options, this page provides verified electrical specifications, thermal derating behavior, saturation voltage performance at rated current, built-in base-emitter shunt resistor topology, and validated alternative options for complementary switching designs.
Technical Context
The 2N6045 is a monolithic silicon Darlington pair with integrated base-emitter shunt resistors, eliminating external bias network requirements. Its architecture supports high DC gain while maintaining robust second-breakdown immunity up to 150 °C junction temperature.
It operates within a –65 °C to +150 °C junction range, features UL 94 V-0 compliant epoxy packaging, and meets ESD ratings of >8 kV (HBM Class 3B) and >400 V (MM Class C). Thermal resistance from junction-to-case is 1.67 °C/W, supporting heatsink-mounted operation at full 75 W dissipation when TC = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | 100 V min - enables use in 80 V rail systems with margin against transients |
| IC (continuous) | 8.0 A - supports direct driving of solenoids, lamp loads, and small motors without external current boosting |
| hFE | 1000–20,000 - allows microcontroller-level base current (e.g., 12 mA) to switch 3–8 A loads |
| VCE(sat) | 2.0 V max @ IC = 3.0 A, IB = 12 mA - limits conduction loss to ≤6 W at full load |
| PD @ TC = 25 °C | 75 W - requires mechanical mounting to heatsink; derates linearly at 0.60 W/°C above 25 °C |
| RθJC | 1.67 °C/W - defines minimum heatsink thermal resistance needed to maintain TJ ≤ 150 °C |
| TJ range | –65 °C to +150 °C - qualified for industrial and automotive under-hood ambient environments |
Pinout & Package
2N6045 uses the standard TO-220 package (Case 221A, Style 1), with emitter, base, and collector leads arranged in vertical order (E-B-C) when viewed with tab facing outward and leads down. The metal tab is electrically connected to the collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (Tab) | Main current output path, thermally coupled to package | Must be mounted to heatsink with insulating washer if isolated from chassis ground; carries full load current |
| Base | Control input for Darlington pair | Internal shunt resistor pulls base low when drive is removed - prevents unintended turn-on during floating conditions |
| Emitter | Current return path and reference node | Connected to system ground or low-side return; voltage drop here affects sensing accuracy in feedback loops |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington with internal base-emitter shunt | Eliminates need for external pull-down resistor - reduces BOM count and PCB footprint in relay/solenoid driver stages |
| High hFE (up to 20,000) | Enables direct GPIO-level drive from 3.3 V or 5 V microcontrollers without intermediate buffer stages |
| VCEO(sus) = 100 V min | Supports 24 V and 48 V industrial control rails with headroom for inductive kickback suppression |
| UL 94 V-0 epoxy encapsulation | Meets flammability safety requirements for enclosed industrial equipment and power supplies |
| Pb-free and RoHS-compliant construction | Complies with EU Directive 2011/65/EU and supports lead-free reflow soldering profiles |
Applications
| Industrial Motor Control | DC Power Relay Driver |
|---|---|
Use Scenario: Driving 24 V DC brushed motors in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: High-gain NPN Darlington switch providing low-impedance path between motor supply and ground. Use Value: Delivers 8 A peak current with <2.0 V saturation drop, minimizing heat generation and enabling compact heatsink design in space-constrained DIN-rail enclosures. |
Use Scenario: Controlling 12–48 V coil relays in building automation panels. IC Role / Device Role / Timing Role: Low-speed switching element interfacing microcontroller GPIO to relay coil. Use Value: Internal base shunt resistor ensures reliable turn-off during MCU reset or brown-out, preventing relay chatter or unintended actuation. |
| Linear Regulator Pass Element | High-Current LED Dimming |
Use Scenario: As series pass transistor in adjustable 5–30 V, 5 A linear regulators for test equipment. IC Role / Device Role / Timing Role: Voltage-controlled current source operating in active region with feedback loop compensation. Use Value: High hFE reduces base drive error current, improving regulation accuracy and reducing thermal stress on error amplifier. |
Use Scenario: Constant-current dimming of high-brightness LED strings in signage and architectural lighting. IC Role / Device Role / Timing Role: Low-frequency PWM-controlled current sink modulating LED brightness. Use Value: 100 V VCEO(sus) accommodates string voltages up to 80 V, while 8 A rating supports multi-string parallel configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BD679A | Lower VCEO(sus) = 80 V; hFE = 750–5000; TO-126 package | Limited to ≤60 V systems; smaller footprint but lower power handling (40 W) | Choose BD679A only for space-constrained, lower-voltage (<60 V) designs where 4 A max current suffices. |
| TIP122 | VCEO(sus) = 100 V; hFE = 1000–8000; TO-220 package; no internal shunt resistor | Requires external 10 kΩ base pull-down; slightly lower gain reduces drive margin at high temperature | Select TIP122 when cost sensitivity outweighs layout simplicity, and external base resistor placement is acceptable. |
Compared with BD679A and TIP122, the 2N6045 offers superior DC gain stability across temperature, integrated turn-off assurance via internal shunt, and higher continuous current capability - making it preferred for industrial-grade reliability in 24–48 V control systems requiring ≥5 A sustained load switching.
Availability
2N6045 is available at Aetrix Electronics and suitable for industrial motor control, DC relay driving, and linear regulator applications requiring stable component supply, long-lifecycle support, and traceable Pb-free sourcing.
Supply support for 2N6045 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 2N6045 belongs to onsemi's legacy plastic medium-power complementary transistor family, engineered for ruggedized general-purpose amplification and low-speed switching in industrial control, power supplies, and electromechanical interface circuits.
FAQ
What is the maximum continuous collector current rating for the 2N6045?
The 2N6045 is rated for 8.0 A continuous collector current (IC) at case temperature TC = 25 °C. This rating assumes proper heatsinking; derating applies at higher temperatures - 0.60 W/°C reduction in power dissipation above 25 °C. At TC = 100 °C, usable continuous current drops to approximately 4.5 A based on thermal limits.
Does the 2N6045 have an internal base-emitter shunt resistor?
Yes, the 2N6045 features monolithic construction with a built-in base-emitter shunt resistor. This design ensures reliable turn-off when base drive is removed, eliminating the need for an external pull-down resistor and preventing false triggering in noisy industrial environments - a key differentiator versus standard Darlingtons like the TIP122.
What is the collector-emitter sustaining voltage (VCEO(sus)) specification for the 2N6045?
The 2N6045 has a minimum collector-emitter sustaining voltage VCEO(sus) of 100 Vdc at IC = 100 mAdc and IB = 0. This rating reflects its ability to block voltage under open-base conditions and supports use in 48 V and 72 V nominal systems with transient margin, unlike the 60 V-rated 2N6043 in the same family.
Can the 2N6045 be used in linear regulator applications?
Yes, the 2N6045 is suitable as a series pass element in linear regulators delivering up to 5 A at adjustable output voltages from 5 V to 30 V. Its high hFE minimizes base drive error current, and its 75 W power rating allows operation with adequate heatsinking - though thermal design must ensure TJ remains ≤150 °C under worst-case dropout and load conditions.
Is the 2N6045 RoHS-compliant and halogen-free?
Yes, the 2N6045G variant is explicitly marked as Pb-free and RoHS-compliant per EU Directive 2011/65/EU. The epoxy package meets UL 94 V-0 flammability standards at 0.125 inch thickness, and all materials conform to onsemi's halogen-free policy - confirmed in the official datasheet revision history and ordering information.
2N6045 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 8 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 2V @ 12mA, 3A
- Current - Collector Cutoff (Max):
- 20µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 1000 @ 3A, 4V
- Power - Max:
- 75 W
- Frequency - Transition:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
2N6045 FAQ
1.How can I place an order for 2N6045 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2N6045 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 2N6045 reliable?
The price and inventory of 2N6045 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N6045 is usually 5 days.
3.What payment methods are accepted for 2N6045?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N6045 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2N6045?
2N6045 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2N6045 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 2N6045?
For technical support, including 2N6045 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N6045 requirements.
6.How does Aetrix verify that 2N6045 is sourced from the original manufacturer or authorized distributors?
All 2N6045 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 2N6045 meets industry standards.
7.What is the process for return or replacement of 2N6045?
All 2N6045 units undergo pre-shipment inspection (PSI). If there is an issue with 2N6045, 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 2N6045 part is unused and in its original packaging.
Return procedure for 2N6045:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2N6045 Tags
-
MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
onsemi
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MMBT2222A-TP
Micro Commercial Co
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
onsemi
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