Homedatasheet1SMC78A

1SMC78A Datasheet

Zener Transient Voltage Suppressors
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TECHNICAL DATA GENERAL DATA APPLICABLE TO ALL SERIES IN THIS GROUP
PLASTIC SURFACE MOUNT ZENER OVERVOLTAGE TRANSIENT SUPPRESSORS 6.8�91 VOLTS 1500 WATT PEAK POWER

The SMC series is designed to protect voltage sensitive components from high voltage, high energy transients. They have excellent clamping capability, high surge capability, low zener impedance and fast response time. The SMC series is supplied in Motorola's exclusive, cost-effective, highly reliable Surmetic package and is ideally suited for use in communication systems, numerical controls, process controls, medical equipment, business machines, power supplies and many other industrial/consumer applications.

Specification Features: Standard Zener Breakdown Voltage Range 91 V Stand-off Voltage Range 78 V Peak Power 1500 Watts 1 ms Maximum Clamp Voltage @ Peak Pulse Current Low Leakage 5 �A Above V UL Recognition Maximum Temperature Coefficient Specified Available in Tape and Reel Response Time Typically 1 ns

Mechanical Characteristics: CASE: Void-free, transfer-molded, thermosetting plastic FINISH: All external surfaces are corrosion resistant and leads are readily solderable POLARITY: Cathode indicated by molded polarity notch. When operated in zener mode, will be positive with respect to anode MOUNTING POSITION: Any LEADS: Modified L-Bend providing more contact area to bond pads MAXIMUM CASE TEMPERATURE FOR SOLDERING PURPOSES: 260�C for 10 seconds WAFER FAB LOCATION: Phoenix, Arizona ASSEMBLY/TEST LOCATION: Seremban, Malaysia MAXIMUM RATINGS

Rating Peak Power Dissipation TL 25�C Forward Surge Current = 25�C Thermal Resistance from Junction to Lead (typical) Operating and Storage Temperature Range

NOTES: 1. Nonrepetitive current pulse per Figure 2 and derated above = 25�C per Figure 3. NOTES: 2. 1/2 sine wave (or equivalent square wave), = 8.3 ms, duty cycle = 4 pulses per minute maximum.

Surge current waveform per Figure 2 and derate per Figure 3 of the General Data 1500 Watt at the beginning of this group. T3 suffix designates tape and reel of 2500 units.

Note 1: A transient suppressor is normally selected according to the reverse "Stand Off Voltage" (VR) which should be equal to or greater than the DC or continuous peak operating voltage level. * VBR measured at pulse test current at an ambient temperaure of 25�C.

ABBREVIATIONS AND SYMBOLS VR Stand Off Voltage. Applied reverse voltage to assure a non-conductive condition (See Note 1). V(BR)min This is the minimum breakdown voltage the device will exhibit and is used to assure that conduction does not occur prior to this voltage level 25�C. VC Maximum Clamping Voltage. The maximum peak voltage appearing across the transient suppressor when

subjected to the peak pusle current in a one millisecond time interval. The peak pulse series resistance and thermal rise. Peak Pulse Current See Figure 2 Peak Pulse Power Reverse Leakage

100 NONREPETITIVE PULSE WAVEFORM SHOWN IN FIGURE 100 10 VALUE tr PEAK VALUE � IRSM PULSE WIDTH (tP) IS DEFINED AS THAT POINT WHERE THE PEAK CURRENT DECAYS 50% OF IRSM. 10 �s

The entire series has Underwriters Laboratory Recognition for the classification of protectors (QVGV2) under the UL standard for safety 497B and File #116110. Many competitors only have one or two devices recognized or have recognition in a non-protective category. Some competitors have no recognition at all. With the UL497B recognition, our parts successfully passed several tests including Strike Voltage Breakdown test, Endurance Conditioning, Temperature test, Dielectric Voltage-Withstand test, Discharge test and several more. Whereas, some competitors have only passed a flammability test for the package material, we have been recognized for much more to be included in their Protector category.


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Manufacturer information

ON SEMICONDUCTOR

ON Semiconductor - ON Semiconductor (Nasdaq: ON) is driving energy efficient innovations, empowering customers to reduce global energy use. The company offers a comprehensive portfolio of energy efficient power and signal management, logic, discrete and custom solutions to help design engineers solve their unique design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power supply applications. ON Semiconductor operates a responsive, reliable, world-class supply chain and quality program, and a network of manufacturing facilities, sales offices and design centers in key markets throughout North America, Europe, and the Asia Pacific regions.

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