SHENZHEN GANGXINLI ELECTRONICS CO.,LTD
Professional Electronic Component Distributor!
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SHENZHEN GANGXINLI ELECTRONICS CO.,LTD
Professional Electronic Component Distributor!
2026/1/21
The 1SMA5931BT3G is a surface-mount single zener diode from onsemi’s 1SMA59xxBT3G series.It features a nominal zener voltage of 18V and 1.5W maximum power,designed for voltage regulation and overvoltage protection in various electronic circuits.
Category:Discrete Semiconductor Products,Diodes,Zener,Single Zener Diodes
Mfr:onsemi
Series:1SMA59xxBT3G
Packaging:Tape & Reel
Part Status:Active
Voltage - Zener (Nom) (Vz):18 V
Tolerance:±5%
Power - Max:1.5 W
Impedance (Max) (Zzt):12 Ohms
Current - Reverse Leakage @ Vr:500 nA @ 13.7 V
Voltage - Forward (Vf) (Max) @ If:1.2 V @ 200 mA
Operating Temperature:-65°C ~ 150°C
Mounting Type:Surface Mount
Package / Case:DO-214AC, SMA
Base Product Number:1SMA5931
Precise Voltage Regulation:Delivers a stable nominal zener voltage of 18V with a tight ±5% tolerance and maximum 12 Ohms impedance (Zzt), ensuring consistent voltage output even in fluctuating circuit conditions.
Low Reverse Leakage:Features a low reverse leakage current of only 500 nA @ 13.7 V, reducing power consumption and improving the overall efficiency of the circuit it is integrated into.
Low Forward Voltage:Has a maximum forward voltage (Vf) of 1.2 V @ 200 mA, minimizing voltage drop during forward conduction and reducing energy loss in the system.
High Power Rating:Boasts a 1.5W maximum power dissipation, enabling it to handle higher power loads and maintain stable performance in continuous operation scenarios.
ESD Protection:Equipped with Class 3 ESD protection (>16 kV) per the human body model (HBM), effectively safeguarding the diode and surrounding components from electrostatic discharge damage during assembly and use.
Lead-Free Compliance:Designed with lead-free materials, complying with RoHS and other environmental standards, meeting the requirements of green manufacturing and global environmental regulations.
High Reliability:Manufactured by onsemi, a reputable semiconductor manufacturer, with strict quality control,ensuring long-term stable operation and low failure rates in various applications.
Power Supply Stabilization:Used in small-signal power supplies for Arduino development boards, stabilizing the 18V input voltage to protect the board’s control chip from voltage fluctuations.
Sensor Power Protection:Integrated into the power circuit of temperature sensors (e.g., DS18B20) in industrial control systems, clamping overvoltage spikes to prevent sensor damage and ensure accurate temperature detection.
Motor Driver Protection:Installed in the power loop of 18V DC motor drivers (e.g., L298N modules) for small robots, shielding the driver chip from voltage surges generated by motor startup and shutdown.
Voltage Reference Source:Serves as a stable 18V reference in the analog-to-digital conversion (ADC) circuit of a portable multimeter, ensuring the accuracy of voltage measurement results.
Audio Amplifier Protection:Used in the power supply circuit of small audio amplifiers (e.g., TDA2822M), stabilizing the voltage to avoid noise and distortion caused by voltage instability in the audio output.
Battery Charger Protection:Integrated into the charging circuit of 18V lithium-ion battery packs for portable power tools, preventing overcharging by clamping the charging voltage at a safe 18V level.
LED Driver Stabilization:Installed in the power circuit of 18V LED strip drivers, stabilizing the output voltage to ensure consistent brightness of the LED strip and extend its service life.
The 1SMA5931BT3G is a compact,reliable 18 V Zener diode offering precise voltage regulation,low power consumption,and effective overvoltage protection,making it ideal for industrial, consumer, automotive, and medical electronics.