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

onsemi MJF6668G

Name: MJF6668G
Brand: onsemi
SKU: MJF6668G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJF6668G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: MJF6668G.pdf

Description:: TRANS PNP DARL 100V 10A TO-220FP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJF6668G from onsemi is a PNP complementary silicon power Darlington transistor in an electrically isolated TO-220 Fullpack (Case 221D) package, rated for 100 V_CEO, 10 A continuous collector current, and 40 W total power dissipation at T_C = 25°C. It delivers high DC current gain (h_FE = 100–15,000 depending on operating point), low V_CE(sat) (≤3.0 V at I_C = 10 A), and 4500 V_RMS isolation voltage - designed for high-reliability switching and linear amplification where heatsink isolation is mandatory.

For engineers reviewing the MJF6668G datasheet, pinout, applications, or equivalent options, this device is selected for thermally demanding, safety-critical power control circuits requiring galvanic separation between collector and heatsink - including industrial motor drives, solid-state relays, and regulated DC power supplies with reinforced insulation requirements.

Technical Context

The MJF6668G implements a monolithic Darlington pair with integrated base-emitter resistor network (≈8 kΩ) and emitter-follower output stage, enabling high current gain without external bias components. Its isolated overmold construction eliminates need for insulating washers while maintaining UL recognition at 3500 V_RMS.

Thermal performance is defined by R_JC = 4.0 °C/W (junction-to-case) and R_JA = 62.5 °C/W (junction-to-ambient), with safe operating area limited by secondary breakdown and thermal derating above 25°C. Electrical behavior includes V_BE(sat) up to 4.5 V at I_C = 10 A and C_ob = 300 pF at V_CB = 10 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	100 V - Maximum collector-emitter voltage before breakdown under open-base conditions; defines maximum blocking capability in switching applications.
I_C (continuous)	10 A - Continuous collector current rating at T_C = 25°C; determines steady-state load drive capacity with adequate heatsinking.
P_D @ T_C = 25°C	40 W - Total power dissipation limit when case temperature is maintained at 25°C; requires mechanical mounting torque ≥6 in·lbs for full rating.
V_CE(sat)	≤3.0 V at I_C = 10 A, I_B = 0.1 A - Saturation voltage defining conduction loss and heat generation during on-state operation.
h_FE	100–15,000 - DC current gain range across operating points; enables low-base-drive-current control of high-load currents.
V_ISOL	4500 V_RMS (t = 0.3 sec) - Isolation voltage between leads and heatsink; satisfies reinforced insulation requirements per UL E69369.
R_JC	4.0 °C/W - Junction-to-case thermal resistance; critical for calculating junction temperature rise when mounted on heatsink with thermal grease.

Pinout & Package

Package: TO-220 Fullpack (Case 221D), Pb-free, UL Recognized (File #E69369), electrically isolated plastic overmold. Mounting surface is dielectric; no insulating washer required.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input node for Darlington pair	Receives base current to initiate conduction; internal ≈8 kΩ resistor connects to emitter for turn-off assurance.
2 (Collector)	Main high-side current path terminal	Connected to high-voltage rail in PNP configuration; electrically isolated from heatsink surface per UL requirements.
3 (Emitter)	Power output and reference node	Serves as common return path; tied to system ground or low-side rail; provides low-impedance output for load connection.

Key Features

Feature	Design Value
Electrically isolated package	Eliminates need for mica washers or silicone pads - reduces BOM cost, assembly time, and thermal interface resistance.
UL Recognition (E69369)	Validated 3500 V_RMS isolation compliance - enables use in safety-critical industrial and medical auxiliary power systems.
High h_FE Darlington architecture	Enables direct microcontroller GPIO drive (e.g., 5 V logic) without external driver stages for ≤10 A loads.
Low V_CE(sat) at high current	3.0 V max at 10 A ensures <30 W conduction loss - improves efficiency and simplifies thermal design vs. standard bipolar transistors.
Pb-free and RoHS compliant	Meets global environmental regulations; compatible with lead-free reflow and wave soldering processes (TL = 260°C).

Applications

Industrial Motor Control	Solid-State Relay (SSR)
Use Scenario: Driving 24–48 VDC brushed motors in programmable logic controller (PLC) output modules with floating chassis requirements. IC Role / Device Role / Timing Role: High-current PNP switch controlling motor direction and braking via emitter-follower configuration. Use Value: 4500 V_RMS isolation prevents ground-loop faults and enables safe operation on ungrounded control panels.	Use Scenario: Replacing electromechanical relays in HVAC zone controllers where silent, bounce-free switching and >100,000 cycle life are required. IC Role / Device Role / Timing Role: Main load-switching element in zero-crossing or random-turn-on SSR designs. Use Value: High h_FE allows direct optocoupler output drive; low V_CE(sat) minimizes self-heating during sustained on-state operation.
Regulated DC Power Supply	Overcurrent Protection Circuit
Use Scenario: Pass transistor in 5–30 V, 5–10 A linear regulator for test equipment requiring ultra-low noise and fast transient response. IC Role / Device Role / Timing Role: Series pass element operating in active region with feedback-controlled base current. Use Value: 150°C max junction temperature and stable h_FE over temperature enable reliable regulation under full-load, high-ambient conditions.	Use Scenario: Current-limiting switch in battery management systems protecting Li-ion packs from short-circuit events. IC Role / Device Role / Timing Role: Fast-acting crowbar or foldback limiter triggered by sense-resistor voltage comparator. Use Value: 15 A peak collector current rating supports brief fault currents; 4.0 °C/W R_JC enables rapid thermal shutdown coordination with external sensors.

Industrial Motor Control

Solid-State Relay (SSR)

Use Scenario: Driving 24–48 VDC brushed motors in programmable logic controller (PLC) output modules with floating chassis requirements.

IC Role / Device Role / Timing Role: High-current PNP switch controlling motor direction and braking via emitter-follower configuration.

Use Value: 4500 V_RMS isolation prevents ground-loop faults and enables safe operation on ungrounded control panels.

Use Scenario: Replacing electromechanical relays in HVAC zone controllers where silent, bounce-free switching and >100,000 cycle life are required.

IC Role / Device Role / Timing Role: Main load-switching element in zero-crossing or random-turn-on SSR designs.

Use Value: High h_FE allows direct optocoupler output drive; low V_CE(sat) minimizes self-heating during sustained on-state operation.

Regulated DC Power Supply

Overcurrent Protection Circuit

Use Scenario: Pass transistor in 5–30 V, 5–10 A linear regulator for test equipment requiring ultra-low noise and fast transient response.

IC Role / Device Role / Timing Role: Series pass element operating in active region with feedback-controlled base current.

Use Value: 150°C max junction temperature and stable h_FE over temperature enable reliable regulation under full-load, high-ambient conditions.

Use Scenario: Current-limiting switch in battery management systems protecting Li-ion packs from short-circuit events.

IC Role / Device Role / Timing Role: Fast-acting crowbar or foldback limiter triggered by sense-resistor voltage comparator.

Use Value: 15 A peak collector current rating supports brief fault currents; 4.0 °C/W R_JC enables rapid thermal shutdown coordination with external sensors.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MJF6668	Same die and package but not Pb-free; lacks RoHS compliance marking and lead-free solder compatibility.	Acceptable only in legacy non-RoHS production environments; incompatible with modern lead-free assembly lines.	Select MJF6668G for new designs requiring environmental compliance and 260°C soldering capability.
STMicroelectronics BDW94C	PNP Darlington in TO-220, 100 V/12 A, but non-isolated package requiring insulating washer; R_JC = 3.5 °C/W.	Higher current rating but adds thermal interface resistance and assembly complexity; UL not recognized.	Choose MJF6668G when isolation, certification, and simplified mounting outweigh marginal current gain.

Compared with MJF6668 (non-Pb-free) and BDW94C (non-isolated), the MJF6668G uniquely combines UL-recognized electrical isolation, RoHS compliance, and drop-in compatibility with legacy 2N6668 footprint - delivering lower system-level BOM and assembly cost without sacrificing thermal or safety performance.

Availability

MJF6668G is available at Aetrix Electronics and suitable for industrial motor control, solid-state relay design, and regulated DC power supply development requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MJF6668G 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

The MJF6668G belongs to onsemi's Complementary Power Darlingtons product line, engineered specifically for isolated-package switching and amplification in safety-critical, thermally constrained systems where electrical separation from heatsinks is mandatory.

FAQ

What is the maximum isolation voltage rating for the MJF6668G?

The MJF6668G is rated for 4500 V_RMS isolation voltage (t = 0.3 sec, RH ≤ 30%, T_A = 25°C), verified per Figure 14 test setup with all leads shorted to heatsink. This exceeds its UL Recognition level of 3500 V_RMS (File #E69369), confirming robust dielectric strength for reinforced insulation in industrial equipment.

Can the MJF6668G be used as a direct replacement for the 2N6668?

Yes - the MJF6668G is electrically similar to the 2N6668 and shares identical pinout (Base–Collector–Emitter), voltage/current ratings, and Darlington topology. However, MJF6668G adds UL-recognized isolation and Pb-free compliance, making it a functionally equivalent yet enhanced upgrade for new designs requiring safety certification and RoHS adherence.

What is the recommended mounting torque for the MJF6668G?

onsemi specifies a minimum mounting torque of ≥6 in·lbs using a 4-40 screw with compression washer to achieve full 40 W power dissipation. Torque must not exceed 10 in·lbs to prevent cracking of the isolated overmold; destructive testing shows failure occurs above 20 in·lbs. Proper torque ensures optimal thermal transfer and maintains isolation integrity.

Does the MJF6668G require an external base resistor?

No - the MJF6668G integrates an internal base-emitter resistor (≈8 kΩ) that provides turn-off bias, eliminating the need for an external pull-down resistor. This simplifies circuit design and improves reliability in microcontroller-driven switching applications where GPIO leakage or floating states could otherwise cause unintended conduction.

What is the thermal resistance junction-to-case (R_JC) for the MJF6668G?

The MJF6668G has a maximum R_JC of 4.0 °C/W, measured with thermocouple contacting the bottom insulated surface beneath the die, mounted on a heatsink with thermal grease and ≥6 in·lbs torque. This value is essential for calculating junction temperature rise under real-world thermal conditions and ensuring operation within the –65°C to +150°C T_J range.

MJF6668G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 10 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 3V @ 100mA, 10A

Current - Collector Cutoff (Max):: 10µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 3000 @ 3A, 4V

Power - Max:: 2 W

Frequency - Transition:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

MJF6668G FAQ

1.How can I place an order for MJF6668G through Aetrix?

Please submit a Request for Quotation (RFQ) for MJF6668G 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 MJF6668G reliable?

The price and inventory of MJF6668G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJF6668G is usually 5 days.

3.What payment methods are accepted for MJF6668G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJF6668G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJF6668G?

MJF6668G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJF6668G 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 MJF6668G?

For technical support, including MJF6668G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJF6668G requirements.

6.How does Aetrix verify that MJF6668G is sourced from the original manufacturer or authorized distributors?

All MJF6668G 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 MJF6668G meets industry standards.

7.What is the process for return or replacement of MJF6668G?

All MJF6668G units undergo pre-shipment inspection (PSI). If there is an issue with MJF6668G, 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 MJF6668G part is unused and in its original packaging.

Return procedure for MJF6668G:

1.Submit a request within 90 days.

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

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