FR015L3EZ Circuit Protection

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Transient voltage suppression (TVS) devices are designed to protect sensitive electronics from high-voltage transients by storing, diverting, or dissipating energy from the transient. Mixed technology TVS devices include multilayer varistors (MLV) and silicon avalanche diodes (SAD). FR015L3EZ is a SAD-based unidirectional TVS diode from Bourns. It is a robust 15 kA surge protection device designed to protect against transients on I/O lines and power supplies.

Application Field

The FR015L3EZ is designed for I/O line protection, typically used to protect microprocessors in electronic circuits from transients caused by electrostatic discharges, power line surges, and cable transients. It is suitable for all applications which require I/O line protection up to 15 kA (8/20 μs) surge levels.

Working Principle

The FR015L3EZ combines SAD and two clamping networks of diodes, thus enabling lightning-level surge protection while providing low capacitance. The device has a low clamping voltage which is typically 15 V, and an inverse current which is typically 15 A. When the diode is reverse-biased, the avalanche effect is triggered when the transient voltage reaches the breakdown voltage, typically at 15 V. When this happens, the diode switches from an open-circuit state to a low resistance clamping state, thus absorbing and suppressing the transient energy. Meanwhile, the two series diodes provide additional clamping and prevent voltage overshoot.

When subjected to a high-voltage transient, the device works as follows: When the transient reaches the breakdown voltage (typically 15 V), the SAD switches from an open-circuit to a low-resistance clamping state, dissipating the transient energy. If the voltage continues to increase, the two series clamping diodes will start to conduct, thus providing greater clamping capability. When the transient energy is dissipated, the diodes revert to their open-circuit states and the device returns to its original quiescent state.

Conclusion

The FR015L3EZ is a mixed technology TVS device designed to protect I/O lines from transients up to 15 kA. The device combines a SAD and two clamping networks of diodes to absorb transient energy and suppress voltage overshoots. Its low clamping voltage makes it an ideal solution for microprocessor protection applications. The device is highly reliable and is designed to meet stringent ESD and surge protection requirements.

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