BSS138N

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BSS138N

DIODE SIL SIC 60V 0.6A SOT-23

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Spezifikationen

Part Status Active
FET Type N-Channel
Technology MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) 50 V
Current - Continuous Drain (Id) @ 25°C 500mA (Ta)
Drive Voltage (Max Rds On, Min Rds On) 2.75V, 10V
Rds On (Max) @ Id, Vgs 3.5Ohm @ 500mA, 10V
Vgs(th) (Max) @ Id 1V @ 250µA
Gate Charge (Qg) (Max) @ Vgs 4.6 nC @ 4.5 V
Vgs (Max) ±20V
Input Capacitance (Ciss) (Max) @ Vds 330 pF @ 15 V
Power Dissipation (Max) 1.3W (Ta)
Operating Temperature -55°C ~ 150°C (TJ)
Mounting Type Surface Mount
Supplier Device Package SOT-23
Package TO-236-3, SC-59, SOT-23-3
Packaging Tape & Reel (TR)

Übersicht

Description

BSS138N is a small-signal N-channel MOSFET in a SOT-23 package, used as a switch and in bidirectional level shifters.
Key specs (typical):
- Vds: around 50V
- Id: about 180 mA
- Rds(on): ~3–6 Ω at Vgs = 4.5V
- Vgs(th): ~0.8–1.5V
Common uses:
- General-purpose switching (low to moderate current)
- Bidirectional level shifting for I2C and GPIO between different voltages
- Small signal switching in compact circuits
How it works (level shifting):
- Gate tied to the lower-voltage rail (V_L)
- Source on the low-voltage side, drain on the high-voltage side
- Each side has its own pull-up to its supply
- When idle, MOSFET is off; when one side pulls low, Vgs rises and the device conducts, pulling the other side low
Notes:
- inexpensive and widely available
- not for high-current or high-speed power switching; orientation matters in some uses.

Features

BSS138N features:
- N-channel enhancement-mode MOSFET
- VDS: ~50 V; ID: ≈ 180 mA
- RDS(on): ~3.5 Ω (typ) at VGS = 4.5 V
- Gate threshold: ~0.8–2.0 V (logic-level gate)
- Fully on with low gate drive (2.5–4.5 V)
- Small-signal, fast switching with low input capacitance
- Package: SOT-23 (surface-mount)
- Wide operating temp range: typically -55°C to +150°C
- Common uses: I2C level shifting, small load switching, general-purpose switching/n-small-signal roles

Package

BSS138N is an N-channel MOSFET packaged in a SOT-23 (3-pin) surface-mount package.

Pinout

- Pin count: 3 pins (G, D, S) in a SOT-23 package.
- Function: N-channel enhancement-mode MOSFET used as a small-signal switch; widely used as a bidirectional level shifter for open-drain buses like I2C.

Manufacturer

There isn’t a single exclusive manufacturer for the BSS138N. It’s a standard N‑channel MOSFET produced by multiple vendors, with Fairchild Semiconductor (now ON Semiconductor) historically associated with it, and other makers such as Vishay, ROHM, NXP, and Renesas also supplying it.
Kind of company: a semiconductor company that designs, fabricates, and sells electronic components (transistors, diodes, ICs, etc.).

Application

- Bidirectional voltage-level translation for open-drain buses (e.g., I2C) between different voltage domains (commonly 3.3V/5V).
- General-purpose, low-current N-channel MOSFET switch/buffer in low-power digital circuits.
- Used in compact sensor, display, and MCU interfaces for simple signal gating and isolation.

Equivalent

Equivalents (50 V, logic‑level N‑channel MOSFETs in SOT‑23):
- BSS138 (same family)
- 2N7002
- 2N7002K
- Si2302
- IRLML2502
- IRLML6344
Note: Rds(on) and gate threshold vary by part and vendor. Check datasheets for Vds, Id, and Rds(on) to fit your design.

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