Good-Ark MOSFET: A Practical Guide For B2B Semiconductor Sourcing

A MOSFET is not selected on the on-resistance in the summary line; it is selected on that resistance hot, on the avalanche energy it can absorb, and on the derating curve that connects the two. A real 600 V part shows why: 0.395 Ω typical and 0.450 Ω maximum at 25 °C, but a continuous drain current of 9 A at a 25 °C case against 5.7 A at 100 °C.

Last updated: October 11, 2026

Key Takeaways

• R_DS(on) rises with junction temperature, so the hot value and the curve behind it decide the conduction loss, not the 25 °C typical figure.
• The current rating belongs to a case temperature: 9 A at 25 °C becomes 5.7 A at 100 °C on the same device.
• Avalanche testing and dv/dt ruggedness are specifications to request, because they describe what the part survives when the circuit misbehaves.
• Gate-charge and output-capacitance behaviour set the switching loss and the drive requirement, and they are part of sourcing, not only of design.
• Package and thermal impedance table the same die differently — a fact worth stating in the procurement file rather than discovering at validation.

The Ratings That Decide a Sourcing Decision

Read the summary line, then read everything that qualifies it. The STMicroelectronics STD12N60M2 is an N-channel 600 V MOSFET in a DPAK package, built on the manufacturer’s MDmesh M2 technology, marked 12N60M2, and supplied on tape and reel.

Parameter	Specified value	Why a buyer should care
Drain-source voltage VDS	600 V	Sets the rail class, with margin for the switching transient
On-resistance RDS(on)	0.395 Ω typical, 0.450 Ω maximum	Conduction loss — and the maximum is what a worst-case budget must use
Continuous drain current ID	9 A at TC = 25 °C; 5.7 A at TC = 100 °C	The derating statement, and the realistic operating figure
Pulsed drain current IDM	36 A	Start-up and fault transients
Total power dissipation	85 W at TC = 25 °C	The thermal budget the heatsink has to serve
Gate-source voltage	±25 V	The drive window, and the clamp the gate needs
dv/dt	15 V/ns peak diode recovery; 50 V/ns MOSFET ruggedness	How the part behaves in a fast-switching loop
Ruggedness and protection	100 % avalanche tested; Zener-protected	Evidence rather than an adjective

The Conduction-Loss Arithmetic, Done Hot

Two multiplications show why the hot value matters.

• At 3 A with the 25 °C maximum resistance of 0.450 Ω: P = 3² × 0.450 = 4.05 W.
• At the same current with a resistance 1.5 × higher at temperature: P = 9 × 0.675 = 6.08 W — half again as much heat for the same load.
• Against the 85 W dissipation rating at a 25 °C case, both figures look comfortable; against the 5.7 A current rating at a 100 °C case, the design has far less margin than the 9 A headline suggests.

The 1.5 × resistance multiplier is a stated assumption, not a datasheet value — the datasheet’s own R_DS(on)-versus-temperature curve is the authority — and the point of the model is the direction: conduction loss is not a single number, and the review should be done at the junction temperature the enclosure produces, at the current the circuit actually runs.

What to Put in the Procurement File

A MOSFET sourcing decision is reviewable when the documents behind the claims are named.

• Datasheet for the exact part and package, including the R_DS(on)-versus-temperature and gate-charge curves.
• Avalanche test evidence — the manufacturer states 100 % avalanche tested on this part, which is a claim that comes with data rather than with a promise.
• dv/dt ruggedness and diode recovery ratings, because a fast loop will exercise both.
• Thermal impedance curves and the package drawing, so the assembly and the copper area can be checked against the condition the ratings assume.
• Qualification evidence for the target market, AEC-Q101 for automotive programmes.
• Lifecycle position and a second source, because a power MOSFET in an industrial platform will be bought for years.

Those six items are also the structure of a fair comparison between suppliers: the same documents, requested for each candidate, read against the same application conditions.

FAQ

Why should R_DS(on) be read hot?

Because it rises with junction temperature, and the conduction loss rises with it. A budget built from the 25 °C maximum understates the heat the part will produce in an enclosure at operating temperature.

What does a drain-current rating at a case temperature mean?

It is a thermal statement, not a property of the die. The example part carries 9 A at a 25 °C case and 5.7 A at 100 °C, so the figure to design with is the one at the case temperature your heatsink can hold.

Why do avalanche and dv/dt ratings matter to a buyer?

They describe what the part survives when the circuit does not behave ideally — a switching transient, a diode recovery event, or energy dumped by an inductive load. A part that is avalanche tested has evidence behind it; one that is not leaves the question open.

How do gate charge and output capacitance affect sourcing?

They set the drive requirement and the switching loss, so they decide whether a lower-resistance part actually improves the design. A part with lower on-resistance and higher gate charge can lose more in the gate drive than it gains in conduction.

What should be requested with the sample?

The datasheet for the exact ordering code, the thermal impedance and package drawings, the avalanche and dv/dt test conditions, and the qualification evidence for the target market — so that the sample evaluation and the production release rest on the same documents.

Related Articles

• Power MOSFET selection guide
• SiC semiconductor selection
• Automotive MOSFET design-in
• The loss equation every power design starts with
• Talk to a Good-Ark engineer

Official Resources

• Good-Ark MOSFET and discrete device families
• Good-Ark package and outline dimensions
• Good-Ark qualification certificates

References

• STMicroelectronics, STD12N60M2 — N-channel 600 V, 0.395 Ω typical, 9 A MDmesh M2 Power MOSFET in a DPAK package, DS10854 Rev 3 — source of the 600 V rating, 0.395 Ω typical and 0.450 Ω maximum on-resistance, 9 A at a 25 °C case and 5.7 A at 100 °C, 36 A pulsed current, 85 W dissipation at a 25 °C case, the ±25 V gate-source rating, the 15 V/ns diode-recovery and 50 V/ns MOSFET dv/dt figures, the avalanche-tested and Zener-protected statements, and the DPAK package and marking. st.com — STD12N60M2 datasheet (PDF)
• STMicroelectronics, STPSC10H065 — SiC power Schottky diode — comparison device for the wide-bandgap option discussed alongside the MOSFET, including its 650 V class and package options. st.com — STPSC10H065 datasheet (PDF)

Continue through this engineering topic

For the complete selection, design, verification, and troubleshooting path, explore the MOSFET IGBT and Transistor Hub.

• Practical guide: What Is a General Purpose PNP Transistor?
• Practical guide: What Is a Pre-Biased Transistor?
• Practical guide: What Is a Digital Switching Transistor?
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