NCE3400 vs NCE2305 vs NCE2302 — NCE SOT-23 MOSFET Selection Guide | ICMASS

NCE3400 vs NCE2305 vs NCE2302: Full Parameter Comparison

Which MOSFET for Which Job?

Key Differences Explained

1. N-Channel vs P-Channel: The Topology Decision

This is the first question you should ask. Not "which has better specs" — all N-channel MOSFETs have better specs than P-channel MOSFETs of the same die size. The question is: what does your circuit topology demand?

N-channel (NCE3400, NCE2302): Switch on the low side — between the load and ground. Turn on by driving the gate high. Best R_DS(on) for the money. Use for DC-DC converters, motor drivers, LED drivers, battery protection (low-side). P-channel (NCE2305): Switch on the high side — between the supply rail and the load. Turn on by driving the gate low. Higher R_DS(on) for the same die area, but you don't need a charge pump or bootstrap circuit. Use for load switches, reverse polarity protection, peripheral power gating.

2. Voltage Headroom: 20V vs 30V

The NCE3400's 30V V_DS rating gives you design margin that the 20V parts don't have. In a 5V circuit, 20V seems like plenty of headroom — and it usually is, until a load dump, hot-plug transient, or inductor flyback pushes the drain above 20V for a microsecond. The NCE3400 gives you 10V of margin above the 20V parts. The NCE2302 and NCE2305 are perfectly safe in 5V systems with good layout; the NCE3400 is safer in anything that might see a transient.

3. Switching Speed: NCE2302 Is in a Different League

The NCE2302's 4.0nC gate charge is less than half the NCE3400's 10nC. In a PWM application, that translates directly to lower gate drive current, faster edges, and less switching loss. See the Q_G bars above: the NCE2302 needs 40% of the drive energy that the NCE3400 requires for each switching cycle. At 500kHz, that's the difference between a cool-running MOSFET and one that needs a heatsink. The trade-off: the NCE2302 gives up voltage rating (20V vs 30V) and current capacity (2.9A vs 5.8A) to achieve those numbers.

When to Choose Which

Choose NCE3400 When:

• You're switching the low side and need the lowest R_DS(on) (24mΩ)
• Your load current is above 3A (up to 5.8A)
• Your circuit might see voltage transients above 20V
• You need one MOSFET that covers most designs — the NCE3400 is the safest default
• Applications: DC-DC converters, motor drivers, battery protection (1S–2S), general low-side switching

Choose NCE2305 When:

• You need to switch the high side (positive rail) without a gate driver IC
• Your supply is 5V or below — within the ±12V V_GS safe range
• You want reverse polarity protection with near-zero voltage drop
• Load current is under 3A (4.1A abs max)
• Applications: USB power switches, peripheral power gating, reverse-battery protection, high-side load switches

Choose NCE2302 When:

• You need high-frequency PWM (200kHz+) with minimal gate drive current
• Your design is 5V or below and current is under 2A continuous
• You want the lowest-cost NCE SOT-23 MOSFET that still delivers logic-level drive
• Gate charge matters more to you than raw current capacity
• Applications: LED PWM dimming, small motor speed control, high-frequency DC-DC, cost-sensitive battery protection

Why Buy NCE SOT-23 MOSFETs from ICMASS?

All three in stock, one shipment. Most designs use at least two types of MOSFETs — N-channel for the heavy lifting, P-channel for the high-side switches. We stock the full NCE SOT-23 family plus alternatives from AO, Vishay, and ON Semiconductor. One order covers your entire MOSFET BOM.

Batch-tested for gate leakage and V_GS(th) shift. NCE MOSFETs are widely sourced across Shenzhen distribution. We verify incoming lots against factory specs before they enter inventory.

Cross-reference support. Not sure which of these three fits your design? Tell us your topology, supply voltage, load current, and switching frequency. We'll tell you which MOSFET to use — and stock the alternatives if you need them.

Shenzhen stock, same-day dispatch before 15:00 CST. Contact ICMASS for current pricing on your quantity. Volume pricing typically ranges from $0.015–$0.06/unit depending on model and order size.

Frequently Asked Questions

Q1: Can I use the NCE2305 for low-side switching too?

A: You can, but you shouldn't. A P-channel MOSFET on the low side works, but the gate drive logic is inverted (low = ON, high = OFF) and you get worse R_DS(on) for the same money. If you're switching the low side, use an N-channel part. The NCE2305's entire reason to exist is high-side switching. Using it anywhere else is paying the P-channel penalty for no benefit.

Q2: Can I just use NCE3400 for everything?

A: For low-side switching, yes — it's the safest default. The NCE3400 covers 80% of SOT-23 MOSFET applications. The 30V/5.8A rating with 24mΩ R_DS(on) is the best all-around spec in the NCE SOT-23 family. The two reasons not to: (1) if you need high-side switching, you want the NCE2305; (2) if you're doing 200kHz+ PWM at low current, the NCE2302 switches faster and costs less.

Q3: Why is the NCE2305 R_DS(on) so much higher?

A: It's P-channel. This is physics, not a design flaw. In silicon, electrons (N-channel carriers) move roughly 2.5× faster than holes (P-channel carriers). To match an N-channel MOSFET's R_DS(on), a P-channel part needs about 2.5× the die area — which won't fit in SOT-23. Every P-channel MOSFET in this package class has R_DS(on) in the 40–80mΩ range. You're trading on-resistance for topology simplicity.

Q4: Are any of these MOSFETs pin-compatible with each other?

A: Yes — all three use the same SOT-23 pinout (Pin 1=Gate, Pin 2=Source, Pin 3=Drain). You can swap between them without PCB changes. But verify the gate drive polarity: N-channel and P-channel require opposite gate signals. Swapping an N-channel for a P-channel without changing the gate drive logic will leave the FET permanently on or permanently off.

Q5: Which one for a 3.3V MCU driving a 5V peripheral?

A: NCE2305 if the peripheral is on the high side; NCE2302 if it's on the low side. Both have V_GS(th) under 1V, so a 3.3V GPIO drives either one fully on. For high-side switching, the NCE2305 with Gate=0V gives V_GS=-5V. For low-side switching, the NCE2302 with Gate=3.3V gives V_GS=3.3V — past the 2.5V point where R_DS(on) flattens out. The NCE3400 also works on the low side but is overkill for a 5V/100mA peripheral.

Q6: Can I parallel different models, like NCE3400 + NCE2302?

A: Technically yes for N-channel + N-channel, but not recommended. When you parallel MOSFETs with different R_DS(on) and gate charge, the one with lower R_DS(on) carries more current and switches slower — creating imbalance. For best results, parallel two of the same model. Never parallel an N-channel with a P-channel — they'll fight each other.

Related Products

• NCE3400 — N-Ch 30V/5.8A, the workhorse
• NCE2305 — P-Ch -20V/-4.1A, high-side specialist
• NCE2302 — N-Ch 20V/2.9A, speed king
• AO3400A — N-Ch 30V/5.8A, ±20V V_GS alternative
• AO3401A — P-Ch -30V/-4.2A, wider voltage P-ch alternative