SMLJ78CA

Voltage - Reverse Standoff (Typ):	78V
Voltage - Breakdown (Min):	86.7V
Voltage - Clamping (Max) @ Ipp:	126V
Current - Peak Pulse (10/1000µs):	22.8A
Power - Peak Pulse:	3000W (3kW)
Power Line Protection:	No
Applications:	General Purpose
Capacitance @ Frequency:	--
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	DO-214AB, SMC
Supplier Device Package:	SMC (DO-214AB)
Series:	SMLJ
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	Zener
Bidirectional Channels:	1

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TVS-Diodes

The SMLJ78CA are TVS (transient voltage suppressor) diodes used to provide electrostatic discharge (ESD) protection in sensitive electronic devices. These devices are often tasked with protecting circuit elements from the accompanying ESD and surges in voltage that can be caused by the static electricity generated by humans. The SMLJ78CA, specifically operates as a bidirectional transient voltage suppressor diode, meaning it works when current is travelling from either the anode or cathode to the other.

Features and Benefits

The SMLJ78CAs feature include a break-down voltage of 78 volts, at which it becomes active, protecting the Electronic Component from voltages higher than that. It also features a low cloning voltage, non-linear capacitance, fast response time, and a peak power of 800W which ensures fast surge protection.This diode feature found in the SMLJ78CA is unique in that it provides the user the assurance that all transistors and chips are safe from ESD related damage. Furthermore, this device is designed to be incorporated into other components; thus, supplying easy integration and use.The small 5 mm packaging of the device makes for easy installation into hard to reach spots and makes sure to provide the same level of protection it has in the larger device packages, but in the device’s smaller form.

Working Principle

The working principle of the SMLJ78CA is based off the PN junction diode which become active when a voltage higher than its breakdown voltage (BV) is applied to it.When an ESD event is applied to the TVS-Diode a large amount of energy will be stored in the device\'s capacitance, leading to the device entering a conducting state for a short period of time. During this state, the device will act like a low forward voltage drop diode, allowing current to travel from both the anode and cathode to the other.It is this forward voltage, as the device dissipates the energy stored in its capacitance, that is ultimately responsible for protecting the circuit.

Application Field

The SMLJ78CA diodes are also highly popular amongst industrial, telecommunications, consumer electronics, and medical equipment, as they are capable of providing ESD protection of up to ±25kV contact discharge.The features of this particular model of TVS-Diodes lend itself to being highly effective in protecting low voltage devices, such as mobile phones, PC cards, and other portable devices, from ESD related phenomena.Since the device features a breakdown voltage of 78V, it ensures that all of the transistors and chips in the device remain safe providing a maximum level of protection.The advantages of this TVS Diode include an excellent protection nature ensuring no circuit failure, low cost and very small size hence easy to integrate into devices, fast switch time and low forward voltage drop. These characteristics will make sure that all circuits are perfectly safe from ESD events.Furthermore, the SMLJ78CA TVS-Diodes also feature an impressive peak power of 800 W, a very important characteristic for today’s high speed electronics and computers.

Conclusion

The SMLJ78CA are an excellent option for providing ESD protection in today’s electronics industry. We all know the long-term damage static electricity can cause and the importance of protecting one’s valuable (and expensive) equipment against it. The low cost, small size, descent forward voltage drop, among other aspects, make the SMLJ78CA a highly sought after choice among engineers in all industries.

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