Specs side by side
2 parts compared · 19 differing specs across 19 total parameters.
| Parameter | ||
|---|---|---|
| Operating temperature | - | -55°C ~ 150°C (TJ) |
| Drain To Source Voltage | - | 30 V |
| Drive Voltage (max Rds On, Min Rds On) | - | 2.5V, 10V |
| Case | SOT-23 (+ TO-92 for 2N7000) | 3-SMD, SOT-23-3 Variant |
| Package | - | Tape & Reel (TR) |
| Component Category | Small-Signal N-Channel MOSFETs | - |
| Current - Continuous Drain (id) @ 25°C | - | 5.8A (Ta) |
| Fet Type | - | N-Channel |
| Gate Charge (qg) (max) @ Vgs | - | 7 nC @ 4.5 V |
| Input Capacitance (ciss) (max) @ Vds | - | 630 pF @ 15 V |
| Market Reality | These two SOT-23 MOSFETs are the level shifters and small switches of modern boards: the standard parts behind I2C bus translation, 3.3V-to-5V interfacing, small load switching and a hundred interfaces that needed something better than a resistor. The pair reads as one drawer and is not one part: the classic 2N7002 is the 60V general switcher whose threshold spec assumed a real gate drive, while the BSS138 is the low-threshold original marketed precisely for 1.8V and 3.3V logic. The variants blur the line constantly - the 2N7002K generation moved thresholds down toward BSS138 territory, and the BSS138K moved voltage up toward 60V - which is exactly why the substitution discipline here is reading the threshold margin and the on-resistance at the actual gate voltage, not the family glance. | - |
| Mounting | - | Surface Mount |
| Power Dissipation | - | 1.4W (Ta) |
| Rds On (max) @ Id, Vgs | - | 28mOhm @ 5.8A, 10V |
| Role In Circuit | Original Reference Part | - |
| Sourcing Status | Active Shenzhen Spot Sourcing (24–48h) | - |
| Technology | - | MOSFET (Metal Oxide) |
| Vgs | - | ±12V |
| Vgs(th) (max) @ Id | - | 1.45V @ 250µA |
Parts
- 2N7002 / BSS138 · onsemi
- AO3400 · alpha-omega-semiconductor-inc