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BSS138-7-F

N-Ch logic-level MOSFET 50V 200mA 3.5Ohm, low Vth, AEC-Q101, SOT-23-3

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Manufacturer Part：

BSS138-7-F

Package：

SOT-23-3 (2.9 x 1.3 x 0.95 mm)

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Description

Product Overview

The BSS138-7-F from Diodes Incorporated is an N-Channel enhancement mode logic-level MOSFET rated at 50V, 200mA with 3.5Ohm maximum on-resistance. It features low gate threshold voltage, fast switching speed, and AEC-Q101 qualification in a tiny SOT-23-3 package, ideal for level shifting and switching applications.

Key Specifications

Manufacturer Diodes Incorporated
Channel Type N-Channel Enhancement
VDS (Drain-Source Voltage) 50V
VGS (Gate-Source Voltage) +-20V
ID (Continuous Drain Current) 200mA @ TA=25C
RDS(on) Max 3.5Ohm @ VGS=10V, ID=220mA
VGS(th) 0.5V to 1.5V (typ 1.2V)
Input Capacitance 50pF @ VDS=10V
Power Dissipation 300mW @ TA=25C
Package SOT-23-3
Operating Temperature -55C to +150C

Features

  • Low on-resistance: 3.5Ohm max at VGS=10V
  • Low gate threshold voltage: 0.5V to 1.5V
  • Low input capacitance: 50pF max
  • Fast switching speed: 20ns max delay times
  • Low input/output leakage current
  • Logic-level gate drive compatible
  • AEC-Q101 qualified for automotive reliability
  • Lead-free, halogen-free, and antimony-free
  • RoHS compliant (Green device)

Applications

  • I2C and SPI voltage level shifting
  • System and load switching
  • Low-power switching applications
  • Logic-level signal driving
  • Battery-powered portable devices

The Diodes Incorporated BSS138-7-F is an N-Channel enhancement mode MOSFET designed for low-power switching and level-shifting applications. With a low gate threshold voltage of 0.5V to 1.5V, the device can be driven directly from 1.8V, 2.5V, or 3.3V logic signals, making it ideal for bidirectional voltage level translation on I2C and SPI buses. The 50V drain-source rating provides ample margin for typical interface voltage translation scenarios. The SOT-23-3 surface-mount package occupies minimal board space while providing 300mW power dissipation capability. The device is AEC-Q101 qualified, making it suitable for automotive applications. It is lead-free, halogen-free, and fully RoHS compliant as a Green device.

The BSS138-7-F operates as a voltage-controlled N-Channel enhancement-mode MOSFET: 1) Gate Control: When VGS exceeds the threshold voltage (0.5-1.5V), an inversion layer forms in the P-body, creating a conductive channel between drain and source. The low threshold voltage enables logic-level gate drive from low-voltage microcontrollers. 2) Conduction: At VGS=10V, RDS(on) is 1.4Ohm typical (3.5Ohm max), providing efficient current conduction for low-power switching applications. At lower VGS values, RDS(on) increases but remains sufficient for level-shifting applications where current is minimal. 3) Level Shifting: When used in a common-gate configuration with a pull-up resistor on the drain, the BSS138 can translate logic signals between different voltage domains. When one side drives low, the MOSFET conducts and pulls the other side low; when released, both sides are pulled high by their respective pull-up resistors. 4) Switching: The low 50pF input capacitance and 20ns switching delays enable fast signal transitions for I2C speeds up to 400kHz and beyond.

Pin Name Type Function
1 Gate Input MOSFET gate (control terminal)
2 Source Output MOSFET source
3 Drain Output MOSFET drain
  • Bidirectional I2C and SPI voltage level shifting between 1.8V/2.5V/3.3V/5V domains
  • System and load switching in battery-powered portable devices
  • Logic-level signal driving and interfacing
  • Low-power relay and LED driving
  • General-purpose switching in consumer and automotive electronics
Manufacturer Part Number Package Notes
onsemi BSS138LT1G SOT-23-3 Direct equivalent, AEC-Q101
Nexperia BSS138P,215 SOT-23-3 Direct equivalent
TI BSS138N SOT-23-3 50V, 220mA, logic level
Infineon BSR138NH6327XTSA1 SOT-23-3 60V, similar function
Diodes Inc BSS138W-7-F SOT-323 Smaller package version
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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