STN851-A footprint, schematic symbol and 3D model by STMicroelectronics

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Part Number STN851-A
Manufacturer STMicroelectronics
Pin Count 4
Part Category Transistor BJT NPN
Package Category SOT223 (3-Pin)
Footprint Name SOT223 (3-Pin) - STN851-A
Released Date Sep 1, 2022
Last Modified Date Jan 8, 2026 2:31 PM UTC
Pinout / Pin List Click Here (Member Only)

STN851-A Details

Manufacturer Part Number:
STN851-A
Brand Name:
STMicroelectronics
Rohs Code:
Yes
Part Life Cycle Code:
Active
Package Description:
ROHS COMPLIANT PACKAGE-4
Pin Count:
4
Country Of Origin:
Mainland China
ECCN Code:
EAR99
Factory Lead Time:
14 Weeks
Manufacturer:
STMicroelectronics
YTEOL:
1
Case Connection:
COLLECTOR
Collector Current-Max (IC):
5 A
Collector-Emitter Voltage-Max:
60 V
Configuration:
SINGLE
DC Current Gain-Min (hFE):
30
JESD-30 Code:
R-PDSO-G4
Number of Elements:
1
Number of Terminals:
4
Operating Temperature-Max:
150 °C
Package Body Material:
PLASTIC/EPOXY
Package Shape:
RECTANGULAR
Package Style:
SMALL OUTLINE
Polarity/Channel Type:
NPN
Power Dissipation-Max (Abs):
1.6 W
Qualification Status:
Not Qualified
Surface Mount:
YES
Terminal Form:
GULL WING
Terminal Position:
DUAL
Transistor Application:
SWITCHING
Transistor Element Material:
SILICON
Transition Frequency-Nom (fT):
130 MHz

STN851-A Frequently Asked Questions (FAQs)

A 2-layer or 4-layer PCB with a solid ground plane and thermal vias is recommended. Ensure a minimum of 1mm clearance around the device for airflow and heat dissipation.
Implement a thermal management system, such as a heat sink or fan, to maintain a junction temperature below 150°C. Also, ensure proper PCB design and component selection to minimize thermal resistance.
Use X7R or X5R ceramic capacitors with a voltage rating of 10V or higher. For input capacitors, use 10uF to 22uF values, and for output capacitors, use 4.7uF to 10uF values.
Use a low-dropout linear regulator (LDO) or a switching regulator with a high power conversion efficiency. Also, optimize the PCB design to minimize power losses and reduce the quiescent current.
Use TVS (Transient Voltage Suppressor) diodes or ESD protection arrays at the input and output pins. Ensure a minimum of 1kV ESD protection rating and follow the manufacturer's guidelines for implementation.

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STN851-A Overview

Use the download button to access the STN851-A schematic symbol and PCB footprint.

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About STMicroelectronics

STMicroelectronics (ST) is a global semiconductor company that designs, manufactures, and markets a broad range of integrated circuits (ICs), discrete devices, and other electronic components. STMicroelectronics offers a diverse portfolio of semiconductor products covering a wide range of applications and industries. Their product categories include microcontrollers, analog and mixed-signal ICs, MEMS (Micro-Electro-Mechanical Systems) sensors, power management ICs, RF (Radio Frequency) transceivers, aut

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