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BSS84LT1G

P-Channel MOSFET, -50V, -130mA, 10Ω RDS(on), SOT-23 logic-level switch

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Manufacturer Part：

BSS84LT1G

Package：

SOT-23-3 (2.9×1.3×1.0 mm)

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Description

Product Overview

The onsemi BSS84LT1G is a P-channel enhancement-mode MOSFET in a compact SOT-23 surface-mount package. With a -50 V drain-source voltage rating, -130 mA continuous drain current, and 10 Ω on-resistance at VGS = -5 V, it is designed for low-power switching and load control in space-constrained applications. The device uses DMOS technology for reliable enhancement-mode operation.

Key Specifications

Channel Type P-Channel Enhancement
VDS (Drain-Source Voltage) -50 V
ID (Continuous Drain Current) -130 mA
RDS(on) @ VGS = -5 V 10 Ω max
RDS(on) @ VGS = -10 V 5 Ω typ
VGS(th) (Gate Threshold) -0.9 V ~ -2.0 V
Qg (Total Gate Charge) 2.2 nC @ VGS = -10 V
Ciss (Input Capacitance) 36 pF
Power Dissipation 225 mW
Package SOT-23-3 (TO-236)
Operating Temperature -55°C ~ +150°C
Forward Transconductance 50 mS

Features

  • Compact SOT-23 surface-mount package for space-constrained designs
  • Voltage-controlled P-channel small signal switch
  • High-density cell design for low on-resistance
  • Logic-level gate drive compatible
  • Low gate charge (2.2 nC) for fast switching
  • Enhancement-mode operation for normally-off safety

Applications

  • Low-current high-side load switching
  • Battery-powered device power control
  • Level shifting and signal gating
  • Load management in portable electronics
  • Logic-level power routing in MCU circuits

The BSS84LT1G from onsemi is a P-channel enhancement-mode small signal MOSFET manufactured using proprietary high cell density DMOS technology. This process minimizes on-state resistance while providing rugged and reliable performance with fast switching characteristics. The device is rated for -50 V drain-source voltage and -130 mA continuous drain current, with RDS(on) of 10 Ω maximum at VGS = -5 V. It can deliver pulsed currents up to -520 mA, making it suitable for switching applications requiring brief high-current bursts. The SOT-23 package offers a compact footprint ideal for high-density PCB layouts in portable and battery-powered equipment.

The BSS84LT1G operates as a voltage-controlled P-channel switch. When the gate-to-source voltage (VGS) exceeds the threshold voltage (approximately -0.9 V to -2.0 V), an inversion channel forms between the P+ source and P+ drain regions through the N-type body, allowing current to flow from source to drain. The RDS(on) decreases with increasing |VGS|, reaching a typical value of 5 Ω at VGS = -10 V. The DMOS cell structure provides a high channel density that minimizes on-resistance per unit area. The enhancement-mode operation ensures the device is normally off (no conduction at VGS = 0), providing a safe default state for power control applications. The low gate charge of 2.2 nC enables fast switching transitions with minimal drive current requirements.

Pin Name Type Function
1 G (Gate) Input Gate control terminal, voltage-driven
2 S (Source) Power Source terminal, typically connected to VCC
3 D (Drain) Output Drain terminal, connected to load
  • High-side load switching: Controlling power to sensors, LEDs, or peripherals from MCU GPIO pins in battery-powered devices
  • Level shifting: Translating logic signals between different voltage domains using P-channel pull-up configuration
  • Power gating: Disconnecting subsystems in ultra-low-power designs to minimize standby current
  • Battery protection: Simple overcurrent or reverse-polarity detection in portable electronics
  • Audio muting: Fast analog signal switching in headphone/speaker mute circuits
Manufacturer Part Number Package Notes
onsemi BVSS84LT1G SOT-23 AEC-Q101 qualified automotive grade
Nexperia BSS84,215 SOT-23 Direct equivalent, same specifications
Infineon BSR14 SOT-23 Similar P-ch, -60V, -180mA
Diodes Inc BSS84-7-F SOT-23 Direct equivalent from Diodes Inc
Toshiba SSM3J332R SOT-23 Lower RDS(on) (1.5Ω), -12V rated
onsemi BSS84LT3G SOT-23 Tape and reel packaging variant
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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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