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

onsemi MJE18004

Name: MJE18004
Brand: onsemi
SKU: MJE18004
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJE18004

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: MJE18004.pdf

Description:: TRANS NPN 450V 5A TO-220

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Product details

Overview

MJE18004 from onsemi is a switch-mode 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, achieves 0.25 V typical V_CE(sat) at 1.0 A/0.1 A drive, operates up to 150 °C junction temperature, and features fast turn-off time of 1.0 µs at 125 °C.

For engineers reviewing the MJE18004 datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (TO-220AB), thermal resistance (1.65 °C/W junction-to-case), dynamic saturation voltage behavior, safe operating area limits, and validated alternatives for switching power supply design validation and component substitution.

Technical Context

The MJE18004 employs a state-of-the-art die optimized for high-efficiency switching in off-line SMPS topologies, with flat DC current gain (h_FE = 12–22 at 1–2 A) across temperature and low base drive requirements. Its architecture eliminates need for external turn-off coils due to absence of current tail.

It supports resistive and inductive load switching with characterized timing parameters including 75 ns turn-on and 1.5 µs turn-off (IC = 2.0 A, TC = 125 °C), and is fully characterized at 125 °C for robust thermal design in enclosed or high-ambient environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Collector Current (Continuous)	5.0 A - Supports primary-side switching in 100–200 W SMPS designs without parallel devices
V_CEO Rating	450 Vdc - Enables direct use in 220 VAC line-operated supplies with margin against transients
V_CE(sat) (1.0 A, 0.1 A)	0.25 V typ - Minimizes conduction loss and heatsink requirements in high-duty-cycle operation
Turn-Off Time (t_off)	1.0 µs max @ 125 °C - Enables >100 kHz switching while maintaining efficiency and EMI control
R_JC	1.65 °C/W - Allows 75 W dissipation at 25 °C case temperature; critical for thermal layout planning
h_FE (IC = 2.0 A)	14–22 - Ensures stable forced beta ≥5 for reliable gate/base drive sizing in hard-switched converters
Output Capacitance (C_ob)	50–65 pF - Low capacitance reduces switching loss and improves zero-voltage switching compatibility

Pinout & Package

Package: TO-220AB (Case 221A-09), non-isolated, standard through-hole mounting. Mounting tab is electrically connected to collector.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input requiring 0.1–0.4 A peak drive for 1–2 A collector current; low V_BE(sat) (0.82–0.92 V) reduces driver loss
2	Collector	Main power output terminal; connected to heatsink tab - must be isolated from chassis if floating topology used
3	Emitter	Power return path; referenced to ground in common-emitter configuration; low-inductance layout essential for fast switching
4	Collector	Second collector connection for enhanced current handling and thermal spreading; tied internally to Pin 2

Key Features

Feature	Design Value
High and flat h_FE at 125 °C	Ensures consistent base drive requirements across full industrial temperature range, simplifying driver design
No current tail during turn-off	Eliminates need for external turn-off coil or active clamp circuitry, reducing BOM count and layout complexity
Full characterization at 125 °C	Provides guaranteed parametric performance under worst-case thermal conditions, enabling derating-free design
Pb-Free and RoHS compliant	Meets global environmental compliance mandates without sacrificing electrical or thermal performance
62.5 °C/W R_JA	Enables natural-convection operation in compact enclosures when heatsinked properly per Figure 22a/b/c

Applications

Switch-Mode Power Supply (SMPS)	Electronic Fluorescent Lamp (EFL) Ballast
Use Scenario: Primary-side switching transistor in 100–200 W offline flyback or forward converter powering industrial control systems. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer from AC line to transformer primary; operates at 60–100 kHz with hard switching. Use Value: 450 V V_CEO and 1.0 µs t_off enable reliable operation with margin against 380 VDC bus spikes and fast transient response.	Use Scenario: Resonant half-bridge switch driving lamp electrodes in commercial lighting fixtures with dimming capability. IC Role / Device Role / Timing Role: High-speed, high-voltage switch in self-oscillating or controlled-frequency ballast circuits; handles repetitive 20–60 kHz switching with inductive loads. Use Value: Low C_ob (50–65 pF) and fast t_fi (90–175 ns) minimize dead-time losses and improve resonant frequency stability.
AC-DC Adapter for Appliances	UPS Inverter Stage
Use Scenario: Main switching element in universal-input (90–264 VAC) adapters for white goods and HVAC controllers. IC Role / Device Role / Timing Role: Primary-side power switch in quasi-resonant or fixed-frequency PWM controller-based adapter designs. Use Value: 75 W P_D at T_C = 25 °C and 1.65 °C/W R_JC support compact heatsinking in space-constrained enclosures.	Use Scenario: DC bus switching device in line-interactive UPS inverters delivering clean 230 VAC output during battery mode. IC Role / Device Role / Timing Role: High-reliability power switch in H-bridge or half-bridge inverter stage handling 1–2 kVA loads. Use Value: −65 to 150 °C operating range and 1000 V V_CES ensure robustness against bus overvoltage and cold-start stress.

Switch-Mode Power Supply (SMPS)

Electronic Fluorescent Lamp (EFL) Ballast

Use Scenario: Primary-side switching transistor in 100–200 W offline flyback or forward converter powering industrial control systems.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer from AC line to transformer primary; operates at 60–100 kHz with hard switching.

Use Value: 450 V V_CEO and 1.0 µs t_off enable reliable operation with margin against 380 VDC bus spikes and fast transient response.

Use Scenario: Resonant half-bridge switch driving lamp electrodes in commercial lighting fixtures with dimming capability.

IC Role / Device Role / Timing Role: High-speed, high-voltage switch in self-oscillating or controlled-frequency ballast circuits; handles repetitive 20–60 kHz switching with inductive loads.

Use Value: Low C_ob (50–65 pF) and fast t_fi (90–175 ns) minimize dead-time losses and improve resonant frequency stability.

AC-DC Adapter for Appliances

UPS Inverter Stage

Use Scenario: Main switching element in universal-input (90–264 VAC) adapters for white goods and HVAC controllers.

IC Role / Device Role / Timing Role: Primary-side power switch in quasi-resonant or fixed-frequency PWM controller-based adapter designs.

Use Value: 75 W P_D at T_C = 25 °C and 1.65 °C/W R_JC support compact heatsinking in space-constrained enclosures.

Use Scenario: DC bus switching device in line-interactive UPS inverters delivering clean 230 VAC output during battery mode.

IC Role / Device Role / Timing Role: High-reliability power switch in H-bridge or half-bridge inverter stage handling 1–2 kVA loads.

Use Value: −65 to 150 °C operating range and 1000 V V_CES ensure robustness against bus overvoltage and cold-start stress.

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
MJF18004	Isolated TO-220 (Case 221D); 35 W P_D; 3.55 °C/W R_JC; UL Recognized (3500 V_RMS)	Required where primary-secondary isolation is mandated by safety standards (e.g., Class II appliances)	Select MJF18004 when creepage/clearance and reinforced insulation are required; not drop-in due to different pinout and thermal profile
BUL1102	Lower V_CEO (400 V); higher R_JC (2.0 °C/W); slower t_off (2.5 µs); same TO-220AB package	Suitable for lower-power (<120 W) or lower-line-voltage (115 VAC) SMPS where 450 V margin is unnecessary	Choose BUL1102 only if design operates below 350 VDC bus and thermal budget allows higher junction rise

Compared with MJF18004, MJE18004 offers higher power dissipation and faster switching but lacks isolation; compared with BUL1102, it delivers superior voltage rating and thermal performance at identical footprint, making it optimal for 220 VAC high-reliability SMPS.

Availability

MJE18004 is available at Aetrix Electronics and suitable for switch-mode power supplies, electronic ballasts, and AC-DC adapters requiring stable component supply, long-term manufacturability, and traceable Pb-free sourcing.

Supply support for MJE18004 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, cloud, and consumer markets.

The MJE18004 belongs to onsemi's high-voltage bipolar power transistor product line, engineered specifically for rugged, high-efficiency switching in line-operated power conversion systems demanding reliability under thermal and electrical stress.

FAQ

What is the maximum collector-emitter sustaining voltage (V_CEO(sus)) for the MJE18004?

The MJE18004 has a guaranteed minimum V_CEO(sus) of 450 Vdc at IC = 100 mA and L = 25 mH, as specified in the datasheet's OFF CHARACTERISTICS table. This rating ensures reliable blocking capability in 220 VAC-derived DC bus applications with transient margin. The MJE18004 maintains this rating across its full operating temperature range.

Does the MJE18004 require an external turn-off coil in base drive circuitry?

No, the MJE18004 does not require an external turn-off coil. Its internal die design eliminates current tail during turn-off, enabling clean, rapid switching with simple resistor-based or active base drive. This feature is explicitly cited in the datasheet's Features section and confirmed by measured t_off values down to 1.0 µs at 125 °C - a key advantage of the MJE18004 over legacy bipolar transistors.

What is the thermal resistance junction-to-case (R_JC) for the MJE18004?

The MJE18004 has a maximum R_JC of 1.65 °C/W, as stated in the THERMAL CHARACTERISTICS table. This value applies to the TO-220AB package (Case 221A-09) under standard mounting conditions with thermal compound and proper screw torque (6–8 in·lbs). It enables 75 W total device dissipation at T_C = 25 °C, directly informing heatsink selection for the MJE18004.

Can the MJE18004 be used in inductive load switching applications like electronic ballasts?

Yes, the MJE18004 is explicitly characterized for inductive load switching, with published data for t_si, t_fi, and t_c under clamped conditions (V_Z = 300 V, L = 200 µH). Its low storage time (1.1–2.5 µs) and fast fall time (70–175 ns) make it well-suited for resonant and self-oscillating electronic fluorescent lamp ballasts, as confirmed in the Applications section of the MJE18004 datasheet.

What is the DC current gain (h_FE) range of the MJE18004 at 2.0 A collector current?

At IC = 2.0 A, V_CE = 1.0 Vdc, and T_C = 25 °C, the MJE18004 exhibits h_FE between 14 and 22 (min to max). At 125 °C, the minimum h_FE drops to 6.0, ensuring predictable forced beta ≥5 for robust base drive design across the full industrial temperature range - a critical parameter confirmed in the ELECTRICAL CHARACTERISTICS table for the MJE18004.

MJE18004 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: SWITCHMODE™

Package/Case:: TO-220-3

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:: 75 W

Frequency - Transition:: 13MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

MJE18004 FAQ

1.How can I place an order for MJE18004 through Aetrix?

Please submit a Request for Quotation (RFQ) for MJE18004 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 MJE18004 reliable?

The price and inventory of MJE18004 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE18004 is usually 5 days.

3.What payment methods are accepted for MJE18004?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE18004 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJE18004?

MJE18004 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJE18004 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 MJE18004?

For technical support, including MJE18004 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE18004 requirements.

6.How does Aetrix verify that MJE18004 is sourced from the original manufacturer or authorized distributors?

All MJE18004 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 MJE18004 meets industry standards.

7.What is the process for return or replacement of MJE18004?

All MJE18004 units undergo pre-shipment inspection (PSI). If there is an issue with MJE18004, 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 MJE18004 part is unused and in its original packaging.

Return procedure for MJE18004:

1.Submit a request within 90 days.

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

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