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onsemi MJF18004
- Part No.:
- MJF18004
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
MJF18004.pdf
- Description:
- TRANS NPN 450V 5A TO-220FP
- Quantity:
- Payment:
- Shipping:
Inventory:6,749
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Product details
Overview
MJF18004 from onsemi is an NPN bipolar power transistor designed for high-voltage switching in 220 V line-operated switch-mode power supplies and electronic light ballasts. It delivers 5.0 A continuous collector current, sustains 450 V collector-emitter voltage, and features UL recognition at 3500 VRMS (File #E69369) in its isolated TO-220 Fullpak package.
For engineers reviewing the MJF18004 datasheet, pinout, applications, or equivalent options, key selection criteria include its 35 W total device dissipation at TC = 25°C, 3.55 °C/W junction-to-case thermal resistance, fast switching performance (ton ≤ 110 ns, toff ≤ 2.5 µs at 125°C), and isolation-rated construction for safety-critical AC/DC converters.
Technical Context
The MJF18004 employs a state-of-the-art die optimized for high-efficiency switching with low base drive requirements-enabled by high and flat DC current gain (hFE = 12–22 at IC = 1–2 A, TC = 125°C) and absence of current tail during turn-off. Its design eliminates need for a coil in the base turn-off circuit.
It operates across −65°C to +150°C junction temperature range and is fully characterized at 125°C. The device supports resistive and inductive load switching with clamped VCC up to 300 V, and its safe operating area (SOA) is validated under both forward-bias (DC and pulsed) and reverse-bias (inductive turn-off) conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Collector Current (IC) | 5.0 A continuous - supports medium-power SMPS output stages without parallel devices |
| VCEO | 450 Vdc - enables direct use in 220 VAC line-fed topologies with margin |
| VCES | 1000 Vdc - ensures robustness against inductive voltage spikes in ballast and flyback designs |
| PD @ TC = 25°C | 35 W - defines maximum steady-state power handling with adequate heatsinking |
| RJC | 3.55 °C/W - determines thermal path efficiency from junction to case mounting surface |
| Switching Time (toff) | 1.0–2.5 µs at 125°C - enables high-frequency operation (>100 kHz) with low switching loss |
| hFE (IC = 2.0 A) | 14–22 (TC = 25°C), 6.0–11 (TC = 125°C) - ensures stable base drive sizing across temperature |
| UL Recognition | 3500 VRMS (File #E69369) - certifies isolation integrity for safety-compliant AC/DC designs |
Pinout & Package
Package: TO-220 Fullpak (Case 221D), fully isolated construction with creepage/clearance compliant for 3500 VRMS isolation testing per UL File #E69369. Mounting requires screw or clip with torque ≤10 in·lbs to preserve isolation integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input requiring ~0.4 A peak base current for 2 A collector drive; low VBE(sat) (0.92–1.25 V) reduces driver loss |
| 2 | Emitter | Common reference node; electrically isolated from heatsink - must be connected externally for circuit return |
| 3 | Collector | Main power output terminal; rated for 450 V sustained and 1000 V breakdown - connects to primary-side switching node |
| 4 | Emitter | Second emitter connection - internally tied to Pin 2; provides redundant bonding for high-current stability and thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| No current tail during turn-off | Eliminates need for base coil or active pull-down, simplifying driver design and reducing component count |
| High hFE flatness over temperature | Enables consistent base drive across −65°C to +150°C, improving reliability in wide-temperature lighting and industrial SMPS |
| UL-recognized isolation | Validated 3500 VRMS isolation allows direct use in Class I and II AC/DC systems without additional barrier certification |
| Optimized SOA for inductive loads | Reverse-bias SOA validated under clamped 300 V conditions - supports reliable operation in electronic ballasts and flyback converters |
| Pb-free & RoHS compliant | Meets global environmental compliance requirements for commercial and industrial end equipment |
Applications
| LED Driver Ballast | AC/DC Switch-Mode Power Supply |
|---|---|
Use Scenario: High-efficiency electronic ballast driving fluorescent or HID lamps from 220 VAC mains. IC Role / Device Role / Timing Role: Main switching transistor in resonant half-bridge or flyback topology, operating at 20–60 kHz. Use Value: Fast switching (toff ≤ 2.5 µs) and high VCES (1000 V) prevent avalanche failure during lamp ignition transients. | Use Scenario: Primary-side switch in offline 35–75 W AC/DC adapters and open-frame power supplies. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer in discontinuous conduction mode (DCM) flyback. Use Value: 450 V VCEO and UL-recognized isolation enable compact, safety-certified designs meeting IEC 62368-1 creepage requirements. |
| Industrial Control Power Module | UPS Inverter Stage |
Use Scenario: Auxiliary power supply within programmable logic controllers (PLCs) and motor drives. IC Role / Device Role / Timing Role: Regulated DC-DC converter switch supplying isolated 5 V/12 V control rails. Use Value: 35 W PD and 3.55 °C/W RJC support thermally constrained PCB layouts without forced air cooling. | Use Scenario: Low-cost inverter stage in line-interactive UPS systems converting 12–24 VDC battery to 220 VAC square-wave output. IC Role / Device Role / Timing Role: High-current switching element in push-pull or half-bridge configuration. Use Value: 5.0 A IC rating and robust SOA allow sustained 2–3 A load currents with minimal derating at elevated ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN bipolar power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJE18004 | Same die, non-isolated TO-220AB package (RJC = 1.65 °C/W, PD = 75 W); no UL isolation rating | Suitable only where heatsink isolation is not required and higher power dissipation is needed | Select MJE18004 when thermal performance is prioritized over safety isolation and board-level creepage can be managed externally |
| ST13007 | Lower VCEO (400 V), lower hFE (min 8 at IC = 2 A), no UL recognition; TO-220 package | Limited to lower-input-voltage SMPS (<200 VAC) and non-safety-critical auxiliary supplies | Choose ST13007 only for cost-sensitive, non-certified designs where 450 V margin and UL compliance are not required |
Compared with MJE18004 and ST13007, the MJF18004 uniquely combines UL-recognized isolation, 450 V VCEO headroom, and 35 W dissipation in a single package-making it the only option among the three qualified for safety-certified 220 VAC-connected lighting and power systems without external isolation barriers.
Availability
MJF18004 is available at Aetrix Electronics and suitable for LED driver ballasts, AC/DC switch-mode power supplies, and industrial control power modules requiring stable component supply, long-term lifecycle support, and certified isolation performance.
Supply support for MJF18004 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, medical, and IoT applications.
The MJF18004 belongs to onsemi's high-voltage bipolar power transistor product line, engineered specifically for reliability and efficiency in 220 V line-operated switch-mode power supplies and electronic lighting ballasts.
FAQ
What is the maximum continuous collector current rating for the MJF18004?
The MJF18004 has a maximum continuous collector current (IC) rating of 5.0 A at TC = 25°C. This rating decreases with rising case temperature, derating at 0.28 W/°C above 25°C. At TC = 100°C, the usable IC drops to approximately 3.1 A based on thermal limits. The device also supports 10 A peak collector current (ICM) for pulse widths ≤5 ms and duty cycle ≤10%.
Does the MJF18004 require a base turn-off coil like older bipolar transistors?
No, the MJF18004 does not require a base turn-off coil. Its die design eliminates current tail during turn-off, enabling clean, fast switching using simple resistor-based or active base drive circuits. This feature is explicitly confirmed in the datasheet under "Features" and verified by dynamic saturation voltage measurements showing rapid VCE(dsat) recovery after IB removal.
What is the significance of UL Recognition File #E69369 for the MJF18004?
UL Recognition File #E69369 certifies that the MJF18004's TO-220 Fullpak (Case 221D) package meets 3500 VRMS isolation withstand voltage under standardized test conditions (Figures 22a–c). This allows designers to use the MJF18004 in safety-critical AC/DC applications without needing additional isolation barriers, streamlining compliance with IEC 62368-1 and other regulatory standards.
How does the thermal resistance of the MJF18004 compare to the MJE18004?
The MJF18004 has a junction-to-case thermal resistance (RJC) of 3.55 °C/W, significantly higher than the MJE18004's 1.65 °C/W. This reflects the MJF18004's fully isolated construction, which adds thermal barrier layers. As a result, the MJF18004's total device dissipation is rated at 35 W (vs. 75 W for MJE18004), requiring more careful heatsink design-but delivering critical isolation where needed.
Can the MJF18004 be used in inductive load switching applications such as electronic ballasts?
Yes, the MJF18004 is explicitly qualified for inductive load switching. Its datasheet includes full characterization of inductive switching parameters-including storage time (tsi), fall time (tfi), and crossover time (tc)-under clamped 300 V conditions at 125°C. The reverse-bias safe operating area (RBSOA) is validated per Figure 16, confirming suitability for electronic lamp ballasts and flyback converters.
MJF18004 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SWITCHMODE™
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 5 A
- Voltage - Collector Emitter Breakdown (Max):
- 450 V
- Vce Saturation (Max) @ Ib, Ic:
- 750mV @ 500mA, 2.5A
- Current - Collector Cutoff (Max):
- 100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 14 @ 300mA, 5V
- Power - Max:
- 35 W
- Frequency - Transition:
- 13MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220FP
MJF18004 FAQ
1.How can I place an order for MJF18004 through Aetrix?
Please submit a Request for Quotation (RFQ) for MJF18004 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 MJF18004 reliable?
The price and inventory of MJF18004 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJF18004 is usually 5 days.
3.What payment methods are accepted for MJF18004?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJF18004 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MJF18004?
MJF18004 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MJF18004 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 MJF18004?
For technical support, including MJF18004 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJF18004 requirements.
6.How does Aetrix verify that MJF18004 is sourced from the original manufacturer or authorized distributors?
All MJF18004 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 MJF18004 meets industry standards.
7.What is the process for return or replacement of MJF18004?
All MJF18004 units undergo pre-shipment inspection (PSI). If there is an issue with MJF18004, 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 MJF18004 part is unused and in its original packaging.
Return procedure for MJF18004:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MJF18004 Tags
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