SMBJ28CE3/TR13 Circuit Protection

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TVS diodes are specialized components used to protect sensitive digital or analog circuits from voltage transients induced by inductive loads, electrostatic discharge (ESD) events or other short-duration voltage disturbances. The SMBJ28CE3/TR13 is a popular unidirectional type of TVS diode, also known by its trade name Transil, from the French manufacturer STMicroelectronics.

In terms of its application field, the SMBJ28CE3/TR13 provides effective bidirectional transient suppression on telecommunications lines, data bus ports, television receivers, automotive and railway electronics, and other circuits, as a surge protector. The component has a wide operating temperature range of -55°C to +150°C, ensuring it remains operational in harsh conditions.

The diode’s working principle is based on the delivery of transient voltage suppression. When a voltage transient occurs, this diode responds very quickly to clamp the voltage down to a safe level, absorbing the excess energy and keeping the voltage in a specified operating range. The device also features a very low junction capacitance, leading to an improved signal integrity, plus low leakage current during normal operation, and an aging-resistant breakdown voltage.

The device’s construction consists of a rugged glass-passivated junction die, encapsulated in a SOD-123 (small outline diode-123) format. It can handle high peak power of up to 600W, and will work at an operating voltage close to its clamping voltage (VC). When the voltage applied to the diode surpasses VC, the internal resistance of the device decreases considerably, allowing it to protect the circuit from over-voltage.

A wide range of equivalent models, with different voltage ratings and surge/power handling capabilities, are available in the market for applications where higher power or higher surge handling is required. All of them, however, incorporate the same basic form and function seen in the SMBJ28CE3/TR13.

In conclusion, the SMBJ28CE3/TR13 is a popular unidirectional type of TVS diode, providing effective bidirectional transient suppression on various circuits, and protecting electronic components from voltage transients induced by inductive loads, electrostatic discharges, or other short-duration voltage disturbances. Its wide temperature range, high peak power, low capacitance and leakage current, and substantial aging-resistant breakdown voltage, makes it the ideal surge protector for a wide range of applications.

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