NCE9435 vs NCE9926 vs NCE30H10K — NCE Power MOSFET Selection Guide

NCE9435 vs NCE9926 vs NCE30H10K: Side-by-Side Comparison

The whole line in one table: current class goes 5A → 6A×2 → 100A; gate drive difficulty goes 4.5V → 2.5V → 10V-plus-driver.

The 9435 is the only one that does high-side without a driver; the 9926 is the only one rated at 2.5V drive; the 30H10K is the only one whose R_DS(on) is a fraction of the others.

Key Differences

Polarity: P-Channel vs N-Channel

The 9435 is P-Channel: source to the rail, drain to the load, gate pulled low to switch on. It's the natural high-side part because the gate references the rail — no charge pump needed.

The 9926 and 30H10K are N-Channel: they switch the low side (or need a driver/level shifter for high side). N-Channel wins on R_DS(on) per die area, which is why the power stage is N-Channel.

Gate Drive: 4.5V vs 2.5V vs 10V

The 9926 is specified at 2.5V — 1.8V and 3.3V logic turn it fully on. The 9435 needs 4.5V minimum for its rated R_DS(on); a 3.3V pin switches it, but at 2–3× the resistance.

The 30H10K is a driver's part: 70nC gate charge and 3V threshold mean a GPIO holds it in the linear region and roasts it. Budget a gate driver delivering 10V with 2–4A peak.

Current Class: 5A vs 6A×2 vs 100A

At 10A, conduction loss is 5.3W on the 9435, 2.8W on a 9926 channel, and 0.55W on the 30H10K — a 10× spread. The 30H10K's 100A rating assumes a cool case and a copper pour on the tab; the SOP-8 parts are package-limited regardless of die capability.

Package: SOP-8 vs SOP-8 vs TO-252

Both SOP-8 parts dissipate through their drain pins — a few watts at most. The TO-252 has an exposed tab that is Drain and doubles as the thermal path — that's how 110W becomes physically possible. Same trench process, different heat budgets.

When to Choose NCE9435

• High-side switching without a gate driver. Rail-referenced gate, GPIO-compatible at 5V — the only one of the three that does this.
• Reverse polarity protection. Body diode blocks wrong polarity, channel carries the load with millivolts of drop.
• Loads up to ~4A. Past that, the SOP-8 thermal budget runs out — step up to the 30H10K with a driver, or a bigger P-Channel.
• 24V-class rails. -30V covers 24V systems; just clamp the gate within ±20V.

When to Choose NCE9926

• Battery protection (DW01-class). Two channels tied drain-to-drain give true bidirectional blocking — the standard 1S topology.
• Switching from 1.8V–3.3V logic. The only one of the three with R_DS(on) specified at 2.5V.
• Low-voltage rails (20V max). 5V/3.3V gating, dual loads, two switches in one footprint.
• Loads of 2–4A per channel. The package is the limit — 1.25W P_D.

When to Choose NCE30H10K

• Motor drive, inverter, or BMS discharge paths. Real current — 10A to 100A peaks.
• A gate driver exists (or is budgeted). 70nC and 3V threshold demand 10V drive with 2–4A peak current.
• Your board can shed 10–50W. The TO-252 tab is Drain — solder it to a serious copper pour or a heatsink.
• 30V-class rails with flyback margin. For 24V systems that ring, consider the 40V-class NCE40H12K instead.

Frequently Asked Questions

Q1: High-side switch — P-Channel or N-Channel?

A: P-Channel (9435) when you want a simple rail-referenced gate; N-Channel with a driver when you need lower loss. High-side N-Channel requires the gate 10V above the floating source — a charge pump or level shifter. For loads under ~4A, the 9435's simplicity wins; above that, an N-Channel power stage with a proper driver is the standard answer.

Q2: Which one for battery protection?

A: The NCE9926 — its two independent channels tied drain-to-drain give true bidirectional blocking. One channel opens on over-charge, the other on over-discharge, and each body diode blocks the direction it would otherwise leak. The 9435 and 30H10K are single-channel and can't do this alone.

Q3: My MCU is 3.3V — which can it drive?

A: The NCE9926, rated at 2.5V drive. The 9435 needs 4.5V for its specified R_DS(on) — at 3.3V it switches but at 2–3× the resistance. The 30H10K is not a logic-level part at all: 70nC and 3V threshold demand a driver.

Q4: Can I use the 30H10K where a 9435 fits?

A: Only if you rework the drive and the layout. Same 30V rating, but the 30H10K is N-Channel low-side with a 10V gate requirement and a TO-252 tab that needs a copper pour. The 9435 is P-Channel high-side with a 4.5V gate. They solve different problems — the polarity alone changes the whole circuit.

Q5: Why does the 9926's 2.5V spec matter so much?

A: Because most parts are only specified at 4.5V or 10V — at 3.3V their R_DS(on) is uncharacterized. The 9926 guarantees 37mΩ at 2.5V, so a 3.3V logic rail fully enhances it. On the 9435, 3.3V drive is exactly where the "unspecified resistance" problem starts.

Q6: How do I pick when the load is 5A?

A: 5A is the uncomfortable middle — the 9435 is at its edge, a 9926 channel needs headroom, and the 30H10K is overkill. At 5A the 9435 dissipates 1.3W (2.5W budget) — workable with good copper. If the design is battery-powered with logic drive, a 9926 channel at 5A is 0.7W — fine. If the system has a driver already, the 30H10K at 0.14W is the coolest answer.

Q7: Can I parallel 9926 channels to match a 30H10K?

A: Technically yes, practically no. Three paralleled 9926 channels give 84mΩ total — still 15× the 30H10K's 5.5mΩ, with three times the package area and gate drive complexity. For real current, use the power-stage part. The 9926's parallelism benefit is only for redundancy or current sharing at its own class.