NCE2302 — N-Channel 20V/2.9A Enhancement Mode Power MOSFET (SOT-23)

What Are the Technical Specifications of NCE2302?

R_DS(on) at each gate drive level. At 33mΩ typical at 4.5V, the NCE2302 competes with MOSFETs rated for double the current. The key trade-off: 20V V_DS max means this is strictly for 5V-and-below designs.

Bar width = typical R_DS(on) relative to 40mΩ. The gap between typical and max is narrow — this is a mature, well-characterized part with tight process control.

Why the NCE2302 punches above its weight class. The 4.0nC gate charge and 300pF input capacitance mean this part switches with almost no drive current. Compare to similar MOSFETs in its class — the NCE2302 needs half the gate drive energy of a typical 20V SOT-23 MOSFET.

When Should You Use (and NOT Use) the NCE2302?

✅ Use NCE2302 when:

• Switching up to 2A from a 5V or 3.3V rail. At 2A and 40mΩ (worst case, 4.5V drive), the NCE2302 dissipates 160mW — well within the 1W package limit. At 2.9A, dissipation rises to 336mW, still safe but warm. This is a 2A part in practice, and the datasheet's 2.9A is achievable with good PCB copper.
• High-frequency PWM above 200kHz. With 4.0nC gate charge, a 10mA gate driver switches the NCE2302 in 400ns. That's practical for 500kHz+ PWM. The 300pF C_ISS means even a weak MCU GPIO (5mA drive) can switch this part at 100kHz without a dedicated gate driver.
• Single-cell Li-Ion protection (sub-3A). For 1S packs below 3A, the NCE2302 is adequate and costs less than the NCE3400. The 20V V_DS rating covers any single-cell scenario.
• LED drivers, small motor drivers, peripheral power gating. Any application under 2A where board space, cost, or switching speed matter. The NCE2302 is the cheapest NCE SOT-23 MOSFET that still delivers logic-level drive and reasonable R_DS(on).

❌ Don't use NCE2302 when:

• V_DS can exceed 20V. 20V is the absolute maximum — there's no margin for ringing or transients. For anything above a 5V rail, step up to NCE3400 (30V) or 2N7002-TP (60V, but only 115mA).
• Load current exceeds 2A continuous. Above 2A, the NCE3400 (5.8A rating, 24mΩ) is the safer choice. The NCE2302 will survive 2.9A, but thermal margin shrinks to near zero on a typical 2-layer board.
• You need the lowest possible R_DS(on). 33mΩ is good, but the NCE3400 delivers 24mΩ (27% lower) for a similar price. In battery-powered designs where every millivolt of drop counts, pay the extra cent for the NCE3400.
• Gate drive is 1.8V. V_GS(th) max is 1.2V, so 1.8V might barely turn it on, but R_DS(on) at 1.8V is unspecified and likely very high. Use BSS138 or add a level shifter.

What Are the Alternatives to NCE2302?

The NCE SOT-23 family: three parts, three jobs.

The NCE2302 is the speed king of the family — less than half the gate charge of the NCE3400. For high-frequency PWM applications, this is the one you want. The trade-off: lower voltage rating and higher R_DS(on).

What Are the Typical Applications of NCE2302?

Battery Protection (1S, sub-3A). Same topology as NCE3400 but scaled down. The NCE2302 sits between BAT− and P−. At 2A load and 40mΩ, voltage drop is 80mV. The 20V V_DS rating is sufficient for single-cell. If you're building a 1S protection board for a sub-$10 product, the NCE2302 saves a fraction of a cent per unit over the NCE3400 — and at volume, fractions of a cent add up.

Why Buy NCE2302 from ICMASS?

Full batch traceability. We verify date codes and lot numbers against NCE Power factory records. The NCE2302's 20V V_DS rating makes it vulnerable to ESD and overvoltage damage during handling — we test incoming lots for gate leakage and V_GS(th) shift before they enter inventory.

NCE SOT-23 family in one shipment. The NCE2302 is usually one of several MOSFETs on a BOM — alongside the NCE3400 for higher-current paths and the NCE2305 for high-side switching. We stock all three. One order, one shipment, one invoice.

Shenzhen stock, same-day dispatch before 15:00 CST. DHL/FedEx to North America and Europe in 5–10 days. Contact us for current pricing on your quantity — volume pricing typically ranges from $0.015–$0.04/unit depending on order size.

Frequently Asked Questions About NCE2302

Q1: NCE2302 vs NCE3400 — when do I pay the extra cent?

A: Pay it when you need >20V, >2A, or the lowest R_DS(on). The NCE3400 gives you 30V V_DS (vs 20V), 5.8A (vs 2.9A), and 24mΩ (vs 33mΩ). For 5V/2A designs, the NCE2302 is adequate and cheaper. For anything that might ever see a voltage transient above 20V, or any current above 2A continuous, the NCE3400's extra margin is worth the few cents. If you're unsure, default to the NCE3400 — the BOM cost difference is smaller than the cost of a field failure.

Q2: Can the NCE2302 really switch at 500kHz?

A: Yes, and this is where it shines. With 4.0nC gate charge and 300pF input capacitance, a 10mA gate driver charges the gate in ~400ns. At 500kHz (2µs period), turn-on and turn-off transitions occupy about 40% of the period — you'll see switching loss, but it's manageable with good layout. Compare to the NCE3400 (10nC): at 500kHz, switching loss dominates and the part runs hot. If you're pushing PWM above 200kHz, the NCE2302 is the best choice in the NCE SOT-23 lineup.

Q3: How much current can the NCE2302 really handle?

A: 2A comfortably, 2.9A with good thermal design. At 2A, worst-case R_DS(on) of 60mΩ (at 2.5V drive) gives 240mW — about 30°C rise above ambient with typical SOT-23 PCB copper. At 2.9A, worst-case dissipation jumps to 500mW — about 63°C rise. The part will survive but your PCB won't love it. For anything above 2A continuous, the NCE3400 is the safer bet.

Q4: Is the NCE2302 avalanche-rated?

A: The standard datasheet does not specify E_AS. The 20V V_DS rating leaves little headroom for inductive kickback anyway. If your application switches inductive loads, add external clamping or choose an avalanche-rated part.

Q5: Why does the NCE2302 have such low gate charge?

A: Smaller die area. The NCE2302 is rated for 2.9A — about half the NCE3400's 5.8A. The silicon die is physically smaller, which means less gate capacitance. The 20V rating also allows a thinner gate oxide than a 30V part. Smaller die + lower voltage rating = lower Q_G. It's not magic, it's physics — and it's the reason this part is so good at high-frequency switching.

Q6: Can I use the NCE2302 in a 2S (7.4V) Li-Ion pack?

A: No — 7.4V nominal means 8.4V fully charged, and transients can push past 10V. While 10V is still under the 20V V_DS rating, a 2S pack with charger transients and load dump can easily exceed 20V for microseconds. For 2S and above, use the NCE3400 (30V) or a dedicated battery protection IC. The NCE2302 is strictly for single-cell and 5V-rail applications.

Q7: NCE2302 vs SI2302DS — any reason to pick the SI part?

A: Only if it's already in your BOM or significantly cheaper. Spec-wise, the NCE2302 has lower R_DS(on) (33mΩ vs ~45mΩ), lower gate charge (4.0nC vs ~5nC), and nearly identical voltage/current ratings. The NCE2302 is the objectively better part. The SI2302DS is ubiquitous and well-characterized, which matters in some regulated industries, but for new designs there's no technical reason to choose it over the NCE2302.

Q8: Does this part need a gate resistor for EMI?

A: Yes — but a small one. With only 300pF input capacitance, the NCE2302 turns on extremely fast even with a weak gate driver. That sharp edge radiates. A 10–47Ω series gate resistor slows the edge just enough to pass EMI without noticeably impacting efficiency below 300kHz. At 500kHz+, keep it at 10Ω or less.

Related Products

• NCE3400 — 30V/5.8A N-Ch MOSFET, SOT-23, step-up for higher voltage/current
• NCE2305 — -20V/-4.1A P-Ch MOSFET, SOT-23, high-side switching complement
• SI2302DS — 20V/2.8A N-Ch MOSFET, SOT-23, near-equivalent alternative
• BSS138 — 50V/200mA N-Ch MOSFET, signal-level HV switching
• 2N7002-TP — 60V/115mA N-Ch MOSFET, SOT-23, highest voltage in SOT-23