NCE3400 — N-Channel 30V/5.8A Enhancement Mode Power MOSFET (SOT-23)

What Are the Technical Specifications of NCE3400?

R_DS(on) at each gate drive level — see the saturation knee. The biggest jump in performance happens between 2.5V and 4.5V. After 4.5V you're deep in the flat part of the curve — more gate voltage buys you almost nothing.

Bar width = typical R_DS(on) relative to 28mΩ (longest). The gap between typical and max widens at low V_GS — budget for worst case when driving from 2.5V.

Gate voltage operating zones — one axis, three regions. The ±12V V_GS absolute maximum is tighter than the industry-typical ±20V. Know where your gate drive sits on this axis before you commit the BOM.

When Should You Use (and NOT Use) the NCE3400?

✅ Use NCE3400 when:

• 3.3V MCU direct drive — no level shifter needed. The 0.9V typical V_GS(th) means a 3.3V GPIO turns it on hard. One less IC on the BOM.
• Single-cell Li-Ion battery protection. 30V V_DSS covers any 1S scenario. 28mΩ at 2.5V keeps voltage drop under 150mV at 5A.
• USB load switching at 5V/2A. Drops only 56mV at 2A with 4.5V gate drive. Within USB spec with margin.
• DC-DC synchronous rectifier (sub-5A, sub-200kHz). Low gate charge keeps switching losses manageable; low R_DS(on) minimizes conduction loss.
• LED matrix row drivers, peripheral power gating. SOT-23 fits between rows on dense layouts.

❌ Don't use NCE3400 when:

• V_DS exceeds 30V (even transient). No avalanche rating specified. Step up to NCE6005AN (60V, SOT-23) or AO3400A (30V with E_AS rating).
• Gate drive is 12V or higher. ±12V V_GSS max. Either add a zener clamp or use AO3400A (±20V).
• Continuous current above 4A in still air. The 5.8A rating assumes 25°C case. Real PCB = 3–4A practical ceiling. For 5A+ sustained, parallel two devices or use SOP-8.
• Switching above 500kHz. 10nC gate charge dominates at high frequency. Use BSS138 or GaN for >500kHz.

What Are the Alternatives to NCE3400?

Head-to-head on the two specs that drive most substitution decisions.

NCE3400 vs AO3400A — the gate voltage decision. Same voltage, same current, same package. The AO3400A wins on gate robustness (±20V vs ±12V) and has an avalanche rating. The NCE3400 typically shows slightly lower R_DS(on) at 2.5V. If your gate drive is 3.3V and well-controlled, NCE3400 gives marginally better conduction. If the gate rail is 12V or might overshoot, pick the AO3400A.

NCE3400 vs STT6N3LLH6 — worth the upgrade. The ST part trims Q_G to 3.6nC — nearly 3× lower. In any design where switching loss is the thermal bottleneck, that alone justifies the higher unit cost.

What Are the Typical Applications of NCE3400?

USB Load Switch. At 5V and 2A, the NCE3400 drops 56mV with 4.5V gate drive. Add a 10kΩ gate pulldown and a 10Ω series gate resistor for controlled slew rate — three components, no dedicated load-switch IC needed.

LED Matrix Row Driver. A 16×16 matrix at 20mA per column puts 320mA through the row FET. The NCE3400 is overkill on current, but its low and consistent R_DS(on) means uniform row voltage — which means uniform brightness across all rows.

Why Buy NCE3400 from ICMASS?

Full batch traceability. NCE MOSFETs are widely sourced. We verify date codes and lot numbers against NCE Power factory records. Out-of-spec V_GS(th) or R_DS(on) gets caught during incoming inspection, not during your production test.

Cross-reference and substitution support. Not sure whether your design needs NCE3400, AO3400A, or a different SOT-23 MOSFET? Send us your operating voltage, load current, switching frequency, and gate drive voltage — we'll tell you which part fits. We stock the full NCE SOT-23 family plus the major alternatives.

BOM consolidation. Most designs using an NCE3400 also need voltage regulators, Schottky diodes, bypass capacitors, and current-sense resistors. One shipment from ICMASS covers the full BOM, Shenzhen to your factory door.

Shenzhen stock, same-day dispatch. Orders placed before 15:00 CST ship same day via DHL/FedEx. Contact us for current pricing on your quantity — volume pricing typically ranges from $0.02–$0.06/unit depending on order size and manufacturer allocation.

Frequently Asked Questions About NCE3400

Q1: Can NCE3400 replace an AO3400A directly?

A: Usually yes, but check your gate drive voltage first. Both are 30V/5.8A in SOT-23 with near-identical pinout. The critical difference: NCE3400 has ±12V V_GS max while AO3400A tolerates ±20V. At 3.3V or 5V gate drive, they're interchangeable. At 12V, the NCE3400 needs a gate clamp. On the other hand, the NCE3400 typically shows slightly lower R_DS(on) at 2.5V — so in 3.3V designs, it actually beats the AO3400A on conduction.

Q2: How much gate voltage does the NCE3400 actually need?

A: It starts turning on around 0.9V, but you need at least 2.5V for full enhancement. At 2.5V, R_DS(on) is 28mΩ typical. At 3.3V, you're safely saturated. At 1.8V, it's barely on and R_DS(on) shoots up — don't use this MOSFET with 1.8V logic without a level shifter.

Q3: What is the maximum current the NCE3400 can really handle?

A: 5.8A on the datasheet, but 3–4A in practice for continuous DC. The 5.8A rating assumes the case is held at 25°C. In still air on a standard 2-layer 1oz board, expect 3–4A before junction temperature exceeds 100°C. For pulsed applications, the 30A (10µs) rating is usable — keep average power under 1.4W.

Q4: Why does the NCE3400 have ±12V gate limit instead of ±20V?

A: Thinner gate oxide — a deliberate trade-off for better low-voltage performance. NCE Power optimized for low V_GS(th) and low R_DS(on) at 2.5V drive. Thinner oxide = lower threshold, but also lower voltage tolerance. Competing parts with ±20V rating have thicker oxide, pushing V_GS(th) higher (1.5–2.5V). It's not a defect — it's a different optimization target. For 3.3V/5V designs, the NCE3400's choice is the right one.

Q5: Is the NCE3400 avalanche-rated?

A: No — the standard datasheet does not specify E_AS. If your application switches inductive loads without clamping, either add external protection or choose a rated part like the AO3400A. For resistive loads, DC-DC converters with proper snubbing, and battery protection circuits, the lack of an E_AS spec is irrelevant.

Q6: Does the NCE3400 need a gate resistor?

A: Yes — a small one for EMI control. With ~825pF C_ISS, the NCE3400 isn't prone to parasitic oscillation. But a 10–100Ω series gate resistor slows the turn-on edge enough to reduce radiated EMI without meaningfully impacting efficiency below 200kHz. At 500kHz+, keep it small (10Ω) to avoid excessive switching loss.

Q7: NCE3400 vs SI2302 — which one for battery protection?

A: NCE3400 — higher current, lower R_DS(on), more voltage margin. The SI2302 is 20V/2.8A with R_DS(on) ~45mΩ. For 3–5A protection, the NCE3400 runs cooler and drops less voltage. The 30V rating also provides margin against charger transients. The SI2302 costs slightly less — use it for sub-2A designs only.

Q8: Can I parallel two NCE3400s for more current?

A: Yes — MOSFETs parallel naturally thanks to positive temperature coefficient on R_DS(on). One heats up → R_DS(on) rises → current shifts to the cooler device. Keep the layout symmetric and add individual gate resistors (10–22Ω) to each MOSFET to prevent high-frequency gate ringing. Two in parallel = roughly half the R_DS(on) and double the current capacity.

Related Products

• NCE2305 — 20V/4A N-Ch MOSFET, SOT-23, lower voltage cousin
• NCE2302 — 20V/3A N-Ch MOSFET, SOT-23, entry-level logic-level switching
• AO3400A — 30V/5.8A N-Ch MOSFET, SOT-23, ±20V V_GS alternative
• 2N7002-TP — 60V/115mA N-Ch MOSFET, SOT-23, high-voltage low-current
• LM7805L-TA3-T — 5V/1A linear regulator, common companion in power supply BOMs