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Q: Is the AO4480 a direct drop-in replacement for the NCE4015S?

Yes - same SO-8 pinout and same 40V class, with the RDS(on) advantage on the NCE side. The 4015S guarantees 10mΩ max at 10V against the AO4480's 11.5mΩ, and 15mΩ at 4.5V against 15.5mΩ. Watch the gate charge: 60nC vs 22nC, so a driver change is the usual companion to the swap.

Q: Can I use two NCE4012S in parallel to replace one NCE4015S?

Yes - and the math is cleaner than it looks. Two 4012S dies in parallel give ~6mΩ effective against the 4015S's 10mΩ, and the total gate charge is 60nC - the same as a single 4015S. You pay in footprint and matching; you win in RDS(on) and part availability.

Q: Does swapping within this SO-8 class change the PCB?

No - all three share pins 1-3 Source, 4 Gate, 5-8 Drain. What changes is the drive requirement (gate charge) and the thermal expectation (conduction loss). Keep the drain copper the same and re-check the driver, and the swap is a BOM line.

Q: Can a 3.3V MCU drive these replacements directly?

No - none of them specify RDS(on) below 4.5V. The AO4480's threshold runs to 3V and the NCE parts to 2.5V, so a 3.3V rail starts conduction but guarantees nothing. Pick a 2.5V-specified part or add a gate driver for 3.3V systems.

Q: How do I tell a genuine NCE4015S from a look-alike?

Check the marking and measure RDS(on) at both drive points. Genuine parts read within the 10mΩ (10V/10A) and 15mΩ (4.5V/8A) maxes; re-marked or suffix-branded parts from smaller dies fail the 4.5V/8A check badly. The marking reads NCE4015S with no brand suffix.

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NCE4015S Equivalent, Alternative & Replacement Guide

2026/9/4 13:08:54

The NCE4015S is a 40V/15A trench N-Channel MOSFET in SOP-8 - 10mΩ max at 10V, 15mΩ max at 4.5V, 60nC gate charge, from Wuxi NCE Power. It sits at the top of NCE's 40V SO-8 line, the die that 24V boards at 8-12A land on.

Why would you be looking for a replacement? Three reasons, from what we see in Shenzhen (2025–2026): the AO4480 legacy socket is closing (distributor listings mark it not-for-new-designs), your BOM wants a second source, or the 4015S itself is on allocation and you need a drop-in for a production run.

The honest one-line answer: the AO4480 is the nearest legacy equivalent (better R_DS(on) on the 4015S), the NCE4012S is the budget step-down for loads under 8A, and two NCE4012S in parallel replace a 4015S socket at the same total gate charge.

NCE4015S vs AO4480 vs NCE4012S: Full Comparison

Parameter	NCE4015S	AO4480 (legacy)	NCE4012S
Manufacturer	Wuxi NCE Power	AOS	Wuxi NCE Power
Drain-Source Voltage (V_DS)	40V	40V	40V
Continuous Drain Current (I_D)	15A (10.6A @ 100°C)	14A	12A (8.5A @ 100°C)
Pulsed Drain Current (I_DM)	70A	-	60A
R_DS(on) max @ 10V	10mΩ (typ 6.1)	11.5mΩ (typ ~8)	12mΩ (typ 8.4)
R_DS(on) max @ 4.5V	15mΩ (typ 11.4)	15.5mΩ	18mΩ (typ 12.3)
4.5V row test current	8A	-	8A
Gate Threshold V_GS(th)	1.2-2.5V (typ 1.8V)	1.0-3.0V (typ 2.0V)	1.2-2.5V (typ 1.6V)
Total Gate Charge (Q_g)	60nC	22nC	30nC
Input Capacitance (C_iss)	3090pF	1920pF	1780pF
Max Power Dissipation (P_D)	3.1W	3.1W	3W
Thermal Resistance R_θJA	40°C/W (t≤10s)	-	41.7°C/W (t≤10s)
Body Diode Recovery	trr 31ns / Qrr 33nC	not published	trr 29ns / Qrr 26nC
Avalanche	characterized (E_AS test circuit)	not published	characterized (E_AS test circuit)
Availability status	In production	not-for-new-designs at distributors	In production
Pinout	1-3 S / 4 G / 5-8 D	1-3 S / 4 G / 5-8 D	1-3 S / 4 G / 5-8 D

The one-line read: the 4015S is a genuine AO4480 upgrade - better R_DS(on) at both drive voltages, published diode recovery, characterized avalanche - at the cost of nearly 3× the gate charge. The 4012S trades a little conduction for half the gate charge.

When to Use the AO4480 Route (AOS Legacy)

Why does a board stay on the AOS socket at all? Because some boards are brand-locked and some drivers are light - the AO4480's 22nC is the friendliest gate load of the three.

Existing AO4480 boards that must stay AOS-branded - the legacy part still flows through distribution, but it's marked not-for-new-designs, so new sockets need a plan.
Gate-charge-sensitive boards where the 4015S's 60nC is too heavy - the AO4480's 22nC is the lightest load of the three; if your driver is a bare GPIO at higher frequency, this matters.
Boards where the design never used more than 12-14A and wants the closest parametric twin - same 40V class, same SO-8 pinout, R_DS(on) within 15%.

When to Use the NCE4012S (Budget Step-Down)

Loads under 8A sustained - at 8A the 4012S burns 0.77W against the 4015S's 0.64W; the difference is a warm finger, not a redesign.
Driver-limited boards - 30nC against the 4015S's 60nC halves the gate drive burden.
Shortage contingency - when the 4015S is on allocation, the 4012S is the same family, same pinout, same marking family, and usually the same reel stock.

When NOT to Use This SO-8 Class at All

Sustained current past ~12A on one part. The 150-mil SO-8 lead frame is the ceiling. Step to a 5×6 leadless part (AON-series, CSD-class) with its thermal slug, or to a TO-252 stage.
3.3V-logic drive. None of these parts specify R_DS(on) below 4.5V. Use a 2.5V-specified part or add a gate driver.
Unclamped automotive load dump. 40V absorbs 12V overshoot but not an ISO 7637-2 test-5 pulse - keep the TVS.
Boards that need a guaranteed numeric avalanche budget - the NCE dies are characterized but publish the E_AS value graphically; if your spec requires a tabulated mJ, ask the factory for the test data before you commit.

Pinout & Layout Notes

Same pinout, all three: pins 1–3 Source, pin 4 Gate, pins 5–8 Drain. A board laid out for the AO4480 takes the NCE4015S or NCE4012S without a footprint change - the swap is a BOM line and a driver check.

The layout rules are shared too: ≥100mm² of drain copper and thermal vias are the rated operating condition for this class - the datasheet R_θJA numbers are 10-second FR4 figures.

Real continuous current collapses without copper, and it doesn't matter what the sticker says if the pour is thin - Fairchild's AN-1032 documents the curve.

When you swap AO4480 → NCE4015S, check the gate trace first - the 4015S asks for nearly 3× the charge per cycle.

A weak GPIO trace that worked at 22nC just switches slower at 60nC. But why does it matter? Only if you switch fast or drive a long trace; a TC4420-class driver fixes both.

The package story: an SO-8 moves heat through its lead frame into the PCB; a 5×6 leadless part dumps it through an exposed slug straight into the copper pour. Past ~12A sustained, the slug wins and the footprint has to change.

R_DS(on) max @ 10V - the NCE top die beats the legacy socket:

NCE4015S10mΩ

AO4480 (legacy)11.5mΩ

NCE4012S (step-down)12mΩ

Conduction loss at any current tracks these bars: the 4015S runs ~15% cooler than the AO4480 and ~17% cooler than the 4012S at the same load.

Total gate charge - the price of the lower R_DS(on):

AO4480 (legacy)22nC

NCE4012S30nC

NCE4015S60nC

Every switching cycle pays the gate charge, and you'll pay it at whatever frequency the board runs. A slow load switch never notices; a high-frequency board with a weak driver should pick by this row first.

Other Alternatives Worth Knowing

AO4484 (AOS): The same manufacturer's own "similar" part - 40V/12.5A class at ~8.5mΩ max at 10V. Why would a board stay with AOS at all? Brand lock, and the fact that this part beats the NCE top die on paper.

It's the answer for boards that must stay AOS-sourced and want headroom over the AO4480. Verify the avalanche and diode rows against your application - the 4015S's characterized avalanche isn't a given on every AOS datasheet.

FDS4480-class (legacy Fairchild): A 40V SO-8, ~12mΩ-class part from the older cross-reference tables - the 4015S and 4012S both beat its R_DS(on) row. Only relevant for BOMs that must stay brand-locked to the old family.

Domestic compat-claim parts (HN4004-class): Chinese cross-reference posts list 40V/10A-class parts as claiming the NCE4015S socket (dianyuan thread 2463493).

Here's the thing to check: a 10A-class die claiming a 15A sticker socket is exactly the sticker-vs-die gap this family warns about. Treat vendor compat claims as an invitation to read the datasheet, not as a spec.

5×6 power-package class: AON-series and similar leadless parts with exposed slugs carry 40V at 30A+ with far better thermal paths. They are the real answer past the SO-8 envelope - at the cost of a footprint change.

Look-alike suffix parts: Parts marketed as "NCE4015S" with a brand suffix (VB-style and TP-style re-brands) are not Wuxi NCE origin. They carry different dies and different guarantee rows - check the marking and measure R_DS(on) before they enter a BOM.

Frequently Asked Questions

Q1: Is the AO4480 a direct drop-in replacement for the NCE4015S?

A: Yes - same SO-8 pinout and same 40V class, with the R_DS(on) advantage on the NCE side. The 4015S guarantees 10mΩ max at 10V against the AO4480's 11.5mΩ, and 15mΩ at 4.5V against 15.5mΩ. Watch the gate charge: 60nC vs 22nC, so a driver change is the usual companion to the swap.

Q2: Why is everyone looking to replace the AO4480?

A: Because distributor listings mark it not-for-new-designs - the legacy socket is closing. The part still flows, but new boards designed on it inherit an end-of-life trajectory. The NCE 40V SO-8 line (4009S/4012S/4015S) is the pin-compatible domestic answer with better R_DS(on) rows on the top die.

Q3: Which replacement keeps the gate drive the lightest?

A: The AO4480 itself at 22nC - and the NCE4012S at 30nC if you're moving off AOS. The 4015S charges 60nC per cycle, so a board whose driver is a bare 5V GPIO at high frequency should step down to the 4012S rather than up to the top die.

Q4: Can I use two NCE4012S in parallel to replace one NCE4015S?

A: Yes - and the math is cleaner than it looks. Two 4012S dies in parallel give ~6mΩ effective against the 4015S's 10mΩ, and the total gate charge is 60nC - the same as a single 4015S. You pay in footprint and matching; you win in R_DS(on) and part availability.

Q5: Does swapping within this SO-8 class change the PCB?

A: No - all three share pins 1-3 Source, 4 Gate, 5-8 Drain. What changes is the drive requirement (gate charge) and the thermal expectation (conduction loss). Keep the drain copper the same and re-check the driver, and the swap is a BOM line.

Q6: Can a 3.3V MCU drive these replacements directly?

A: No - none of them specify R_DS(on) below 4.5V. The AO4480's threshold runs to 3V and the NCE parts to 2.5V, so a 3.3V rail starts conduction but guarantees nothing. Pick a 2.5V-specified part or add a gate driver for 3.3V systems.

Q7: How do I tell a genuine NCE4015S from a look-alike?

A: Check the marking and measure R_DS(on) at both drive points. Genuine parts read within the 10mΩ (10V/10A) and 15mΩ (4.5V/8A) maxes; re-marked or suffix-branded parts from smaller dies fail the 4.5V/8A check badly. The marking reads NCE4015S with no brand suffix.

Q8: Which replacement survives an unclamped inductive event?

A: The NCE parts - both the 4015S and the 4012S publish a characterized avalanche rating with an E_AS test circuit. The AO4480 listings we have verified show no avalanche rating. For relay, solenoid, and motor kick that can slip past the flyback diode, the characterized NCE dies are the safer replacement.