SI2300DS vs SI2304DS vs SI2305DS vs AO3407 — Which SOT-23 MOSFET Should You Choose?
2026/7/13 13:08:50
SI2300DS vs SI2304DS vs SI2305DS vs AO3407 - Which SOT-23 MOSFET Should You Choose?
Quick Summary
N-channel: SI2304DS is the sweet spot for 3.3V/5V logic - 35mΩ Rds(on) handles 2A continuously. SI2300DS is only needed for 1.8V logic where the slightly lower Vgs(th) matters.
P-channel: AO3407 outperforms SI2305DS in every spec (30V vs 20V, 4.2A vs 3.5A, 35mΩ vs 45mΩ) at roughly the same price. Default to AO3407 unless you already have SI2305DS in your BOM.
How Do These SOT-23 MOSFETs Compare on Key Parameters?
| Parameter | SI2300DS (N) | SI2304DS (N) | SI2305DS (P) | AO3407 (P) |
|---|---|---|---|---|
| Vds | 20V | 20V | -20V | -30V |
| Id (continuous) | 2.8A | 4.2A | -3.5A | -4.2A |
| Rds(on) @ 4.5V | 125mΩ | 45mΩ | 45mΩ | 35mΩ |
| Vgs(th) min | 0.65V | 0.7V | -0.4V | -1.0V |
| Package | SOT-23 | SOT-23 | SOT-23 | SOT-23 |
| Price (1k) | $0.06 | $0.07 | $0.07 | $0.08 |
When to Choose Each
| Use Case | Winner | Why |
|---|---|---|
| 1.8V logic switching | SI2300DS | Lowest Vgs(th) at 0.65V |
| 3.3V/5V N-ch load switch | SI2304DS | 35mΩ, 4.2A, same price as SI2300DS |
| High-side switch (3.7V) | AO3407 | 30V rating gives headroom |
| Cost-sensitive high volume | SI2304DS / SI2305DS | $0.07/ea at 1K |
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