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BSS138LT1G

N-ch logic-level MOSFET, 50V, 200mA, 3.5Ohm, low Vth, SOT-23

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Manufacturer Part：

BSS138LT1G

Package：

SOT-23-3 (TO-236) (2.9 x 1.3 x 1.0 mm)

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Description

Product Overview

The BSS138LT1G from onsemi is an N-channel enhancement mode logic-level MOSFET in a SOT-23-3 package. Rated at 50V VDS and 200mA with low threshold voltage (0.85V-1.5V), it is specifically designed for low-voltage level shifting and switching in portable and battery-powered products.

Key Specifications

VDS (Max) 50V
ID (Continuous) 200mA
RDS(on) Max 3.5 Ohm @ VGS=5V, 200mA
RDS(on) @ 2.75V 10 Ohm max
VGS(th) 0.85V ~ 1.5V
Forward Transconductance 100 mS (min)
Power Dissipation 225mW
Package SOT-23-3 (TO-236)

Features

  • Low threshold voltage for 1.8V-3.3V logic drive
  • 50V drain-source voltage for level shifting
  • Compact SOT-23 footprint
  • AEC-Q101 qualified version available (BVSS138L)
  • Pb-free, halogen-free, RoHS compliant

Applications

  • I2C and SPI level translation (1.8V to 3.3V)
  • Logic-level signal switching
  • DC-DC converter gate drive
  • Power management in portable devices
  • PCMCIA card and cellular phone circuits

The BSS138LT1G is an N-channel small-signal MOSFET from onsemi with an exceptionally low gate threshold voltage (0.85V to 1.5V), making it ideal for direct drive from 1.8V and 2.5V logic levels. The 50V drain-source rating enables it to translate signals between different voltage domains, particularly popular for I2C and SPI bus level shifting between 1.8V/2.5V/3.3V rails. The SOT-23-3 package provides a compact footprint for space-constrained designs. An AEC-Q101 qualified version (BVSS138L) is available for automotive applications.

The BSS138L operates as a voltage-controlled N-channel MOSFET with an enhancement mode gate structure. The low threshold voltage (VGS(th) 0.85-1.5V) means the channel begins conducting at very low gate voltages, enabling direct interface with low-voltage digital logic. In level-shifting applications, the MOSFET is connected with drain pulled up to the higher voltage rail via a resistor, and source tied to the lower voltage rail. When the low-voltage input drives the gate, the MOSFET conducts, pulling the drain toward the source voltage, effectively translating the logic level. The open-drain configuration makes it ideal for bidirectional I2C level shifting.

Pin Name Type Function
1 Gate Input Gate control terminal
2 Source Power Source terminal
3 Drain Output Drain terminal
  • I2C/SMBus bidirectional level shifting (1.8V to 3.3V)
  • SPI UART logic level translation
  • Low-voltage digital signal switching
  • DC-DC converter low-power switching element
  • Battery-powered portable device power gating
Manufacturer Part Number Package Notes
Nexperia BSS138PW SOT-323 Same die, smaller package
Infineon BSV81 SOT-23 N-ch, 50V, 220mA
onsemi 2N7002LT1G SOT-23 N-ch, 60V, 115mA, higher Vth
Diodes Inc MMBF170 SOT-23 N-ch, 60V, 500mA
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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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