onsemi MJE13009G

Overview

MJE13009G from onsemi is an NPN silicon power transistor designed for high-voltage, high-speed switching in inductive circuits where fall time is critical-specifically rated for 400 V_CEO(sus), 12 A continuous collector current, and 100 W total device dissipation at T_C = 25°C. It targets switch-mode applications including switching regulators, inverters, motor controls, solenoid/relay drivers, and CRT deflection circuits.

For engineers reviewing the MJE13009G datasheet, pinout, applications, or equivalent options, key selection criteria include its reverse-bias safe operating area (SOA) at T_C = 100°C, 120 ns typical fall time under inductive clamped conditions, 700 V blocking capability (V_CEV), and Pb-free TO-220AB package compatibility with industrial thermal management requirements.

Technical Context

The MJE13009G operates as a high-voltage NPN bipolar junction transistor optimized for fast turn-off in inductive switching circuits. Its design emphasizes controlled energy handling during reverse-biased turn-off, validated by clamped inductive SOA curves up to 12 A and 300 V at T_C = 100°C, with voltage storage time (t_sv) of 920 ns (typ) and crossover time (t_c) of 120 ns (typ) at 8 A.

It features a pulsed forward-bias SOA validated at T_C = 25°C and second-breakdown-limited operation, requiring strict adherence to base-emitter reverse bias (1.5–9 V) during turn-off to maintain rated V_CEV = 700 V. Thermal resistance is specified as R_JC = 1.25°C/W, enabling direct heatsink mounting for sustained 100 W dissipation at case temperature ≤25°C.

Key Specifications

Pinout & Package

Package: TO-220AB (Case 221A-09), single-ended vertical mount, metal tab electrically connected to collector, RoHS-compliant Pb-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BUW12 and MJE13007G, the MJE13009G delivers 2 A higher continuous current, 20 W higher power dissipation, and 150 ns faster typical fall time-making it the preferred choice for 400–500 W switch-mode systems operating at elevated ambient temperatures.

Availability

MJE13009G is available at Aetrix Electronics and suitable for switching regulators, inverters, and motor controls requiring stable component supply with long-term industrial lifecycle support.

Supply support for MJE13009G 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 MJE13009G belongs to onsemi's Switch-mode Series of NPN silicon power transistors, engineered specifically for high-voltage, high-speed inductive switching where fall time and reverse-bias SOA performance are critical to system efficiency and reliability.

FAQ

What is the maximum safe operating voltage for MJE13009G in switching applications?

The MJE13009G has a collector-emitter sustaining voltage V_CEO(sus) of 400 Vdc, which applies during active conduction with zero base current. For blocking mode-when the base-emitter junction is reverse-biased-it achieves V_CEV = 700 Vdc, verified at V_BE(off) = 1.5–9 V. This 700 V rating is critical for surviving leakage inductance spikes in flyback and forward converters. Exceeding these voltages risks avalanche breakdown or second breakdown failure.

How does MJE13009G achieve fast fall time in inductive circuits?

The MJE13009G achieves a typical fall time (t_f) of 0.2 µs under clamped inductive conditions by optimizing minority carrier lifetime and base region doping. Its design mandates reverse base-emitter bias (−1.5 to −9 V) during turn-off to rapidly extract stored charge, reducing voltage storage time (t_sv) to 920 ns (typ) at 8 A/100°C. This mechanism is validated in the reverse-bias SOA curves and requires proper gate/base driver design with active pull-down capability.

Can MJE13009G be used in parallel configurations?

Yes, the MJE13009G supports parallel operation due to its positive thermal coefficient of V_CE(sat), which promotes current sharing as junction temperature rises. However, each device requires individual base drive resistors (typically 1–2 Ω) and matched layout to minimize parasitic inductance. The TO-220AB package's low R_JC = 1.25°C/W also aids thermal balancing. Derate total current by 15% for two devices and 25% for three or more in shared heatsink configurations.

What thermal management is required for full 100 W dissipation of MJE13009G?

To sustain 100 W dissipation, the MJE13009G requires a heatsink that maintains case temperature (T_C) at or below 25°C. With R_JC = 1.25°C/W and typical R_CS (case-to-sink) ≈ 0.2°C/W using thermal grease, the heatsink-to-ambient thermal resistance (R_SA) must be ≤0.45°C/W. This typically demands a finned aluminum heatsink ≥150 cm² surface area with forced airflow ≥1 m/s. Without active cooling, derating to ≤40 W is recommended for natural convection.

Is MJE13009G suitable for automotive under-hood applications?

The MJE13009G is rated for junction temperature from −65°C to +150°C and qualified per industrial standards, but it is not AEC-Q101 qualified for automotive under-hood use. Its 100°C-rated reverse-bias SOA and 700 V blocking support engine control modules or HVAC actuators if externally validated for vibration, ESD, and lifetime reliability. For production automotive designs, onsemi's AEC-Q101-qualified alternatives like the NSS12201LT1G should be considered instead of the MJE13009G.