What is SMBJ36CA and Why is it Essential for Circuit Protection

SMBJ36CA acts as a type of TVS diode. This device protects sensitive circuits from voltage spikes, electrostatic discharge (ESD), electrical overstress (EOS), and lightning surges. Its bidirectional design allows it to handle both positive and negative voltage transients. Engineers choose SMBJ36CA for its fast response time and reliable performance in industrial, automotive, and general electronics.

Key Takeaways

• SMBJ36CA is a bidirectional TVS diode that protects electronic circuits from voltage spikes and surges in both directions, making it ideal for AC and DC circuits.

• It reacts extremely fast—within nanoseconds—to clamp dangerous voltages and prevent damage to sensitive components.

• The device handles high surge currents and power, with a peak pulse power rating of 600W, ensuring strong protection in harsh environments.

• Its low-profile surface-mount package fits easily on circuit boards and supports automated assembly, making it practical for many electronic designs.

• SMBJ36CA is widely used in industrial, automotive, and general electronics to improve reliability and safeguard devices from electrical threats.

SMBJ36CA Overview

What is SMBJ36CA

SMBJ36CA is a bidirectional TVS diode. Engineers use it to protect electronic circuits from sudden voltage spikes. This device can handle both positive and negative surges, which makes it ideal for AC circuits or situations where voltage can change direction. Unlike unidirectional TVS diodes, which only protect against one type of voltage spike, SMBJ36CA offers protection in both directions. This feature gives circuits more complete and balanced protection from electrical threats.

Tip: Bidirectional TVS diodes like SMBJ36CA are especially useful in environments where voltage can swing above or below normal levels.

The table below shows the main characteristics that define SMBJ36CA:

How It Works

SMBJ36CA protects circuits by reacting quickly to voltage spikes. When the voltage across the diode stays below its working voltage, the device acts like an open switch and does not affect the circuit. If a voltage spike pushes the voltage above the breakdown range, the diode switches to a low resistance state. This action clamps the voltage and keeps it from rising higher, which shields sensitive parts from damage.

The bidirectional design means SMBJ36CA can respond to spikes in either direction. This makes it a strong choice for protecting circuits that face unpredictable or alternating voltage surges. Its fast response time, measured in nanoseconds, ensures that it reacts before the spike can harm the circuit. The low leakage current also means it does not waste energy during normal operation.

Features

Electrical Specifications

Engineers rely on the SMBJ36CA for its strong electrical performance. This device can handle a peak pulse power of 600 Watts when tested with a 10/1000μs waveform. The working voltage stands at 36V, which means it protects circuits that operate at or below this level. When a voltage spike occurs, the diode clamps the voltage to a safe level, preventing damage to sensitive components. The maximum clamping voltage reaches up to 58.1V, which shows its ability to absorb high-energy surges.

The SMBJ36CA responds to voltage spikes in less than a nanosecond. This fast action helps shield circuits from sudden transients. The peak pulse current can reach 10.4A, making it suitable for environments where strong surges may happen. The device also features low leakage current, so it does not waste energy during normal operation.

The operating temperature range extends from -55°C to +175°C. This wide range allows the diode to perform well in extreme heat or cold. The hybrid encapsulation of ceramic and plastic materials helps the device stay stable and reliable, even when temperatures change quickly. This makes the SMBJ36CA a good choice for industrial, automotive, and aerospace uses.

Note: The wide temperature range and fast response time make this diode ideal for protecting electronics in harsh environments.

Package and Design

The SMBJ36CA uses the DO-214AA (SMB) package. This surface-mount design allows for easy placement on printed circuit boards. The low-profile package saves space and supports automated assembly processes. The bidirectional protection feature means the device can guard against both positive and negative voltage spikes, which is important for AC circuits and systems with unpredictable surges.

Semtech Corporation supplies the SMBJ36CA and ensures the device meets industry standards. Their product offers reliable surge protection, fast response, and compliance with RoHS and WEEE environmental standards. The design focuses on durability and quality, so the diode can withstand repeated surges without losing effectiveness.

Engineers can find the SMBJ36CA from trusted suppliers, making it easy to source for new designs or repairs.

Protection Mechanism

Fast Response

SMBJ36CA acts quickly when a voltage spike appears in a circuit. The device detects sudden changes in voltage and responds almost instantly. This fast reaction is a key feature of transient voltage suppressor diodes. When a surge or spike occurs, the diode switches from a high-resistance state to a low-resistance state. This change happens in less than a nanosecond. Because of this speed, the diode can stop harmful voltage before it reaches sensitive parts of the circuit.

Many overvoltage protection devices react more slowly. SMBJ36CA stands out because it can suppress voltage transients much faster. This quick action helps prevent damage from events like electrostatic discharge (ESD) and electrical overstress (EOS). Engineers trust this device to protect important electronics, especially in environments where voltage spikes happen often.

Tip: Fast response time means better protection for delicate electronic components.

Clamping Action

When a surge event occurs, SMBJ36CA clamps the voltage to a safe level. The device uses avalanche diode technology to limit the voltage spike. It keeps the voltage from rising above a maximum clamping voltage of 58.1 volts. This action diverts excess current away from the protected circuit. The table below shows the main electrical characteristics during a surge:

The clamping action protects against ESD, EOS, and large surges. By keeping the voltage within safe limits, the diode prevents permanent damage to electronic devices. This makes SMBJ36CA a reliable choice for circuit protection in many applications.

SMBJ36CA Applications

Industrial Uses

Many industrial systems face frequent voltage transients and electrical surges. Engineers use SMBJ36CA to protect computers, consumer electronics, I/O interfaces, and VCC buses in these environments. The device meets strict standards for ESD and EFT protection, which helps keep sensitive equipment safe. The table below shows common industrial applications and their protection needs:

SMBJ36CA improves equipment reliability by clamping voltage spikes, reacting quickly, and handling high surge currents. These features help keep industrial machines running without interruption.

Automotive Uses

Automotive electronics face unique challenges from voltage surges and ESD. The SMBJ36CA protects sensitive automotive systems by clamping dangerous voltage spikes and switching to a low-impedance state during transients. This action shields circuits from load dumps, ESD, and other electrical threats. The device meets standards like IEC 61000-4-2 and ISO 10605, which are important for automotive safety and reliability.

• Used in automotive systems for ESD and surge protection

• Protects communication lines such as CAN buses

• Guards sensitive components like transceivers and termination resistors

• Meets strict automotive and aerospace reliability standards

Note: Fast response and high peak pulse power make this device ideal for harsh automotive environments.

General Electronics

Many consumer and portable devices benefit from SMBJ36CA integration. The device protects USB and HDMI interfaces, floor sweeping robots, and other general electronic products from voltage spikes and ESD. Its small size and surface-mount package make it easy to add to modern circuit boards.

• USB and HDMI interfaces

• Floor sweeping robots

• Portable electronic equipment

• Other general electronic products

Reliable surge and ESD protection help these devices last longer and work safely in everyday use.

Engineers value this TVS diode for its fast response, high reliability, and wide application range. The table below compares its performance with similar devices, showing strong ratings for peak pulse power, temperature, and leakage current.

For more technical details, engineers should review the official datasheet.

FAQ

What does SMBJ36CA protect against?

SMBJ36CA protects circuits from voltage spikes, ESD, electrical overstress, and lightning surges. It keeps sensitive electronics safe by clamping dangerous voltages quickly.

Can SMBJ36CA be used in both AC and DC circuits?

Yes. SMBJ36CA works in both AC and DC circuits because of its bidirectional design. It handles voltage spikes in either direction.

How does SMBJ36CA respond to a voltage spike?

SMBJ36CA detects a spike and switches to a low-resistance state in less than a nanosecond. This action clamps the voltage and protects the circuit.

What package type does SMBJ36CA use?

SMBJ36CA uses the DO-214AA (SMB) surface-mount package. This design fits well on modern printed circuit boards and supports automated assembly.

Where can engineers find more technical details?

Engineers can review the official datasheet for full specifications and application notes. Most major electronic component suppliers provide these documents online.

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