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

onsemi MJE18204

Name: MJE18204
Brand: onsemi
SKU: MJE18204
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MJE18204

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: MJE18204.pdf

Description:: TRANS NPN 600V 5A TO-220FP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MJE18204 from ON Semiconductor is a SWITCHMODE™ NPN bipolar power transistor optimized for electronic light ballast and switching power supply applications. It delivers 5 A continuous collector current, 1200 V C-E sustaining voltage (VCER), and 75 W dissipation at TC = 25°C in TO-220AB package. Its high hFE (up to 35 at 25°C), fast switching (ton ≤ 175 ns, toff ≤ 2.5 µs), and no-current-tail turn-off enable high-efficiency ballast control.

For engineers reviewing the MJE18204 datasheet, pinout, applications, or equivalent options, key selection criteria include its 1200 V VCES rating, isolated vs. non-isolated TO-220 variants (MJE18204 vs. MJF18204), thermal resistance (RθJC = 1.65°C/W), dynamic saturation voltage (VCE(dsat) = 2.5 V @ 25°C), and suitability for inductive switching with clamped 300 V operation.

Technical Context

The MJE18204 employs an application-specific die architecture engineered for high-voltage, medium-power switching in fluorescent lamp ballasts and offline SMPS. It features flat DC current gain across temperature (hFE ≥ 5 at 125°C), low base drive requirements, and robust safe operating area (SOA) validated up to 1200 V with inductive loads under clamped conditions.

Its switching performance is characterized under both resistive (VCC = 300 V, PW = 20 µs) and inductive (VZ = 300 V, LC = 200 µH) loads, with storage time (ts) as low as 1.35 µs at 25°C and crossover time (tc) ≤ 250 ns - critical for minimizing conduction losses in high-frequency ballast drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	600 Vdc - Maximum collector-emitter voltage with base open; defines primary breakdown limit in linear operation.
V_CES	1200 Vdc - Sustaining voltage under switching conditions; enables use in 600–800 V bus applications with margin.
I_C (cont)	5 Adc - Continuous collector current rating; supports 40–60 W ballast output stages without forced cooling.
P_D @ T_C=25°C	75 W - Thermal-limited power dissipation; requires heatsink with R_θJA ≤ 62.5°C/W for ambient operation.
h_FE	10–35 - DC current gain range at I_C = 1–5 A; ensures stable base drive design across temperature and production lot.
t_off	1.75–2.5 µs - Turn-off time under resistive load; enables >200 kHz ballast operation with minimal tail current loss.
R_θJC	1.65°C/W - Junction-to-case thermal resistance; dictates minimum heatsink interface conductance for thermal management.

Pinout & Package

Package: TO-220AB (Case 221A–09), non-isolated, standard leadframe. Mounting hole accepts 4-40 screw; maximum torque 10 in·lbs to preserve isolation integrity.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Low-impedance return path; connected to ground or negative rail in common-emitter switch configuration.
2 (Base)	Control input	Receives drive current (IB ≤ 4 A peak); low V_BE(sat) (0.83 V) reduces driver power loss.
3 (Collector)	High-voltage output terminal	Connects to lamp inductor or SMPS transformer primary; rated for 1200 V transient stress.

Key Features

Feature	Design Value
No coil required for fast turn-off	Eliminates external base-turnoff inductor, reducing BOM count and layout complexity in ballast drivers.
Full characterization at 125°C	Guarantees parametric stability over full industrial temperature range; avoids derating surprises in enclosed fixtures.
6 Sigma manufacturing	Tight h_FE and V_CE(sat) distributions reduce need for binning and improve batch-to-batch consistency.
Clamped SOA validation	Reverse-bias SOA verified at 300 V clamp, enabling reliable operation in inductive flyback circuits without avalanche stress.
Two package options	MJE18204 (TO-220AB, non-isolated) and MJF18204 (TO-220 Fullpack, isolated) support flexible thermal/mechanical integration.

Applications

Fluorescent Lamp Electronic Ballast	Offline Switch-Mode Power Supply
Use Scenario: High-frequency (20–60 kHz) resonant inverter driving 32–40 W T8/T5 lamps in commercial lighting fixtures. IC Role / Device Role / Timing Role: Main switching transistor in half-bridge topology; handles 300–400 V DC bus and lamp ignition transients. Use Value: Low storage time (ts ≤ 2 µs) and flat h_FE ensure consistent zero-voltage switching (ZVS) timing across temperature, extending lamp life.	Use Scenario: 50–100 W AC/DC adapter or industrial auxiliary supply using flyback or forward converter. IC Role / Device Role / Timing Role: Primary-side power switch; operates in discontinuous conduction mode (DCM) with 65–130 kHz PWM. Use Value: 1200 V V_CES rating provides margin against reflected transients and line surges, improving reliability in unregulated mains environments.
Inductive Load Motor Driver Stage	High-Voltage DC-DC Converter
Use Scenario: Low-duty-cycle (<10%) gate driver stage for solenoid or relay control in HVAC or industrial controls. IC Role / Device Role / Timing Role: High-side switch controlling inductive load; subjected to L·di/dt-induced voltage spikes during turn-off. Use Value: Robust reverse-bias SOA and 1200 V V_CBO prevent failure during inductive kickback without snubber networks.	Use Scenario: 400–800 V input to 24–48 V output DC-DC stage in telecom or EV charging infrastructure. IC Role / Device Role / Timing Role: Primary switch in phase-shifted full-bridge or LLC resonant converter; handles high dv/dt and repetitive avalanche stress. Use Value: Dynamic saturation voltage (V_CE(dsat) = 2.5 V @ 25°C) minimizes conduction loss at high current, improving efficiency above 90%.

Fluorescent Lamp Electronic Ballast

Offline Switch-Mode Power Supply

Use Scenario: High-frequency (20–60 kHz) resonant inverter driving 32–40 W T8/T5 lamps in commercial lighting fixtures.

IC Role / Device Role / Timing Role: Main switching transistor in half-bridge topology; handles 300–400 V DC bus and lamp ignition transients.

Use Value: Low storage time (ts ≤ 2 µs) and flat h_FE ensure consistent zero-voltage switching (ZVS) timing across temperature, extending lamp life.

Use Scenario: 50–100 W AC/DC adapter or industrial auxiliary supply using flyback or forward converter.

IC Role / Device Role / Timing Role: Primary-side power switch; operates in discontinuous conduction mode (DCM) with 65–130 kHz PWM.

Use Value: 1200 V V_CES rating provides margin against reflected transients and line surges, improving reliability in unregulated mains environments.

Inductive Load Motor Driver Stage

High-Voltage DC-DC Converter

Use Scenario: Low-duty-cycle (<10%) gate driver stage for solenoid or relay control in HVAC or industrial controls.

IC Role / Device Role / Timing Role: High-side switch controlling inductive load; subjected to L·di/dt-induced voltage spikes during turn-off.

Use Value: Robust reverse-bias SOA and 1200 V V_CBO prevent failure during inductive kickback without snubber networks.

Use Scenario: 400–800 V input to 24–48 V output DC-DC stage in telecom or EV charging infrastructure.

IC Role / Device Role / Timing Role: Primary switch in phase-shifted full-bridge or LLC resonant converter; handles high dv/dt and repetitive avalanche stress.

Use Value: Dynamic saturation voltage (V_CE(dsat) = 2.5 V @ 25°C) minimizes conduction loss at high current, improving efficiency above 90%.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-voltage switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STW30NF20	N-channel MOSFET (200 V, 30 A); lower gate drive loss but lower voltage rating than MJE18204.	Suitable for <400 V bus applications only; cannot replace MJE18204 in 600+ V ballast designs.	Select only if system voltage ≤ 200 V and gate drive simplicity is prioritized over voltage headroom.
BU508A	PNP complementary device (1500 V, 8 A); same package but opposite polarity and higher current.	Requires circuit redesign (e.g., high-side vs. low-side switch); not drop-in compatible.	Use only in complementary pair configurations or where PNP topology is mandated by existing schematic.

Compared with STW30NF20 and BU508A, the MJE18204 uniquely balances 1200 V capability, 5 A current, and bipolar drive compatibility in TO-220AB - making it irreplaceable in legacy ballast designs requiring NPN high-voltage switching without MOSFET gate charge trade-offs.

Availability

MJE18204 is available at Aetrix Electronics and suitable for electronic ballast, switching power supply, and industrial motor control applications requiring stable component supply and long-term manufacturability.

Supply support for MJE18204 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and consumer markets.

The MJE18204 belongs to ON Semiconductor's SWITCHMODE™ bipolar power transistor product line, designed specifically for high-reliability, high-voltage switching in lighting and power conversion systems where ruggedness and parametric consistency are critical.

FAQ

What is the maximum junction temperature rating for the MJE18204?

The MJE18204 has an operating junction temperature range of –65°C to +150°C. This wide range allows deployment in sealed luminaires and industrial enclosures without active cooling, provided thermal design maintains T_J ≤ 150°C under worst-case power dissipation and ambient conditions.

Does the MJE18204 require a base turn-off coil in electronic ballast circuits?

No, the MJE18204 does not require a base turn-off coil. Its internal die design eliminates current tail during turn-off, enabling direct base drive with simple transistor or IC-based gate drivers - reducing component count and board space in compact ballast PCBs.

How does the MJE18204 differ from the MJF18204 variant?

The MJE18204 uses a standard TO-220AB package (non-isolated), while the MJF18204 uses an isolated TO-220 Fullpack (Case 221D–02) with 4500 V RMS isolation. Both share identical electrical specs, but MJF18204 allows direct heatsink mounting without insulating hardware, simplifying thermal design in high-isolation systems.

What is the typical dynamic saturation voltage of the MJE18204 at 125°C?

The MJE18204 exhibits a dynamic saturation voltage (V_CE(dsat)) of 7.5 V at 125°C under I_C = 2 A and I_B1 = 660 mA drive. This value reflects real-world switching loss during high-temperature operation and must be factored into thermal modeling for sustained duty cycles.

Can the MJE18204 be used in avalanche mode for energy recovery?

No, the MJE18204 is not rated for repetitive avalanche operation. Its safe operating area is verified under clamped conditions only. Avalanche use risks parametric shift or catastrophic failure; external clamping (e.g., TVS diode or RCD snubber) is mandatory for inductive load protection.

MJE18204 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 600 V

Vce Saturation (Max) @ Ib, Ic:: 1.25V @ 400mA, 2A

Current - Collector Cutoff (Max):: 200µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 18 @ 500mA, 3V

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

MJE18204 FAQ

1.How can I place an order for MJE18204 through Aetrix?

Please submit a Request for Quotation (RFQ) for MJE18204 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 MJE18204 reliable?

The price and inventory of MJE18204 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJE18204 is usually 5 days.

3.What payment methods are accepted for MJE18204?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJE18204 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJE18204?

MJE18204 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJE18204 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 MJE18204?

For technical support, including MJE18204 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJE18204 requirements.

6.How does Aetrix verify that MJE18204 is sourced from the original manufacturer or authorized distributors?

All MJE18204 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 MJE18204 meets industry standards.

7.What is the process for return or replacement of MJE18204?

All MJE18204 units undergo pre-shipment inspection (PSI). If there is an issue with MJE18204, 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 MJE18204 part is unused and in its original packaging.

Return procedure for MJE18204:

1.Submit a request within 90 days.

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

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