onsemi MJE18206

Overview

MJE18206 from ON Semiconductor (formerly Motorola) is an NPN bipolar power transistor optimized for electronic ballast and high-voltage switch-mode power supply applications. It delivers 8 A continuous collector current, 600 V V_CEO, 1200 V V_CES, and 100 W power dissipation at T_C = 25°C in a TO-220AB package - enabling robust operation in fluorescent lamp ballasts and industrial AC/DC converters.

For engineers reviewing the MJE18206 datasheet, pinout, applications, or equivalent options, this device is selected for high-efficiency, high-voltage switching where fast turn-off without base coil, low V_CE(sat) at 3 A, and full characterization at 125°C are critical design requirements.

Technical Context

The MJE18206 features a high-voltage planar epitaxial die structure with rugged SOA performance up to 1200 V and 8 A under inductive switching conditions. Its forced β of 5–10 enables predictable drive requirements in resonant ballast topologies.

Designed for clamped-inductive loads (e.g., L = 200 µH, V_clamp = 300 V), it exhibits 2.25 µs storage time and 300 ns fall time at I_C = 3 A, T_J = 25°C - supporting >50 kHz operation in electronic lighting systems.

Key Specifications

Pinout & Package

Package: TO-220AB (Case 221A–06), non-isolated, plastic, 4-pin configuration with dual collector leads for enhanced current handling and thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJE13007 and BU508A, the MJE18206 provides superior thermal management (1.25 °C/W), verified 125°C operation, and extended SOA - making it the preferred choice for high-reliability, high-frequency electronic ballasts and industrial power supplies demanding long-term parametric stability.

Availability

MJE18206 is available at Aetrix Electronics and suitable for electronic ballast design, industrial switch-mode power supplies, and induction heating driver stages requiring stable component supply, traceable lot history, and lifecycle continuity.

Supply support for MJE18206 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 leader focused on energy-efficient electronics, with roots in Motorola's pioneering power transistor development.

The MJE18206 belongs to Motorola's high-voltage bipolar power transistor family, engineered specifically for electronic lighting ballasts and high-reliability industrial power conversion - emphasizing rugged SOA, thermal stability, and manufacturability under strict process control.

FAQ

What is the maximum junction temperature rating for the MJE18206?

The MJE18206 has a specified operating junction temperature range of –65°C to +150°C. All electrical characteristics - including V_CEO(sus), h_FE, and t_off - are fully characterized at 125°C, ensuring validated performance at elevated thermal stress points typical in enclosed ballast and power supply environments. The MJE18206 must be thermally managed to maintain T_J ≤ 150°C under worst-case load and ambient conditions.

Does the MJE18206 require a base drive coil for fast turn-off?

No, the MJE18206 does not require a base drive coil for fast turn-off. Its internal die design and optimized carrier lifetime enable rapid minority-carrier extraction with active base reverse drive (e.g., I_B2 = 1.5 A), eliminating the need for external inductive snubbers. This feature is explicitly highlighted in the original Motorola datasheet as a key advantage for electronic ballast applications, directly reducing component count and layout complexity in the MJE18206-based design.

What is the safe operating area (SOA) limit for the MJE18206 at 100 µs pulse width?

The MJE18206 SOA curve (Figure 17) specifies a maximum allowable collector current of approximately 7 A at V_CE = 300 V for a 100 µs pulse width under forward-bias conditions. This limit is derived from second-breakdown constraints and assumes T_C = 25°C. For longer pulses or elevated case temperatures, derating per Figure 19 is required. The MJE18206's extended SOA supports reliable operation in high-peak-current lighting and power supply transient events.

Is the MJE18206 pin-compatible with the MJF18206?

No, the MJE18206 is not pin-compatible with the MJF18206. While both share identical electrical specifications, the MJF18206 uses an isolated TO-220 package (Case 221D–02) with internal insulation between leads and case, whereas the MJE18206 uses a standard non-isolated TO-220AB package (Case 221A–06). Their pinouts differ: MJE18206 has four pins (Base, Collector, Emitter, Collector), while MJF18206 has three pins (Base, Collector, Emitter) with insulated mounting tab. Substituting one for the other requires PCB and heatsink redesign.

What is the typical Cob (output capacitance) of the MJE18206 at 10 V V_CB?

The typical output capacitance (C_ob) of the MJE18206 is 200 pF, measured at V_CB = 10 Vdc and f = 1 MHz, as specified in the Electrical Characteristics table on page 3–770 of the Motorola datasheet. This value directly impacts switching speed and EMI generation in high-frequency ballast and SMPS designs; designers must account for C_ob in snubber network calculations and gate drive strength sizing for the MJE18206.