• 1SMA5918BT3G SMA-2
1SMA5918BT3G SMA-2


Diode Zener Single 5.1V 5% 500mW 2-Pin SMA T/R


  • 90-day after-sales guarantee
  • 365 Days Quality Guarantee
  • Genuine Product Guarantee
  • 7*24 hours service quarantee

Quick Inquiry

Please submit RFQ for 1SMA5918BT3G or email to us: Email: [email protected], we will contact you in 12 hours.

Overview of 1SMA5918BT3G

The 1SMA5918BT3G is a Zener diode designed for voltage regulation and protection applications.This diode features a breakdown voltage of 18V and a maximum power dissipation of 1.5W,making it suitable for various circuit protection and voltage regulation tasks.


(Note:The pin configuration below is a general representation.Refer to the specific datasheet for precise details.)

  • A: Anode Connection
  • K: Cathode Connection
  • No Connection: NC

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the 1SMA5918BT3G Zener diode for a visual representation.

Key Features

  • Zener Diode: The 1SMA5918BT3G is a Zener diode that provides voltage regulation characteristics.
  • Breakdown Voltage: This diode has a breakdown voltage of 18V, offering protection against voltage spikes.
  • Power Dissipation: With a maximum power dissipation of 1.5W, it can handle moderate power levels.
  • Compact Package: Available in a space-saving SMB package for easy integration into circuits.
  • Wide Operating Temperature Range: Operates effectively within a temperature range of -55°C to +150°C.

Note: For detailed technical specifications, please refer to the 1SMA5918BT3G datasheet.


  • Voltage Regulation: Ideal for providing stable voltage levels in electronic circuits.
  • Overvoltage Protection: Use the 1SMA5918BT3G to protect sensitive components from voltage spikes.
  • Signal Clipping: Can be used for signal clipping and voltage limit applications.


The 1SMA5918BT3G Zener diode regulates voltage effectively, providing stability and protection in various electronic systems.

Usage Guide

  • Connection: Connect the Anode(A) to the higher voltage side and Cathode(K) to the lower voltage side.
  • Protection: Utilize the Zener diode to regulate voltage and protect downstream components from overvoltage conditions.

Frequently Asked Questions

Q: What is the breakdown voltage of the 1SMA5918BT3G?
A: The breakdown voltage of the 1SMA5918BT3G is 18V, offering protection against voltages above this level.

Q: Can the 1SMA5918BT3G be used for power regulation?
A: Yes, the 1SMA5918BT3G can be used for power regulation by maintaining a stable voltage level across its terminals.


For similar functionalities, consider these alternatives to the 1SMA5918BT3G:

  • 1N4742A: This Zener diode offers a breakdown voltage of 12V, suitable for applications requiring lower voltage protection.
  • 1N5378B: With a breakdown voltage of 75V, this Zener diode provides higher voltage protection capabilities compared to the 1SMA5918BT3G.



The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Status Active Compliance PbAHP
Package Type SMA-2 Case Outline 403D-02
MSL Type 1 MSL Temp (°C) 260
Container Type REEL Container Qty. 5000
ON Target N VZ Typ (V) 5.1
P Max (W) 1.5 Pricing ($/Unit) $0.0848Sample

Warranty & Returns

Warranty, Returns, and Additional Information

  • QA & Return Policy

    Parts Quality Guarantee: 365 days

    Returns for refund: within 90 days

    Returns for Exchange: within 90 days

  • Shipping and Package

    Shipping:For example, FedEx, SF, UPS, or DHL.UPS, or DHL.

    Parts Packaging Guarantee: Featuring 100% ESD anti-static protection, our packaging incorporates high toughness and superior buffering capabilities.

  • Payment

    For example, channels like VISA, MasterCard, UnionPay, Western Union, PayPal, and more.

    If you have specific payment channel preferences or requirements, please get in touch with our sales team for assistance.