SM712H LEIDITECH
Document overview
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Technical content
Features
Ultra low leakage: nA level Operating voltage: 7Vor12V Low clamping voltage Complies with following standards: – IEC 61000-4-2 (ESD) immunity test Air discharge: ±30kV Contact discharge: ±30kV – IEC61000-4-4 (EFT) 40A (5/50ns) RoHS Compliant Dimensions SOT-23 Pin Configuration Mechanical Characteristics Package: SOT-23 Lead Finish: Lead Free UL Flammability Classification Rating 94V-0 Quantity Per Reel:3,000pcs Reel Size:7 inch Absolute Maximum Ratings (Tamb=25°C unless otherwise specified) Parameter Symbol Value Unit Peak Pulse Power (8/20µs) Ppp 600-1000 W ESD per IEC 61000−4−2 (Air) V ESD ± 30 Kv ESD per IEC 61000−4−2 (Contact) ± 30 Operating Temperature Range T J -55 to +125 Storage Temperature Range T STJ -55 to +150
Applications
Protection of RS-485 transceivers with extended common-mode range Security systems Automatic Teller Machines HFC systems Networks Rev : www.leiditech.com 01.06.2018 1/4 – IEC61000-4-5 (Lightning) 36A for 12V & 7V (8/20μs) SM712H
Fig1. 8/20µs Pulse Waveform 0 5 10 15 20 25 30 120 t r 100 Peak Value I PP t d =t I PP TEST WAVEFORM PARAMETERS t r s t d =20 s t - Time ( I PP - Peak Pulse Current - % of I PP Fig3. Power Derating Curve 0 25 50 75 100 125 150 110 100 % of Rated Power A mbient Temperature T A º Fig2. ESD Pulse Waveform (according to IEC 61000-4-2) 60ns 10% Percent of Peak Pulse Current % 30ns tr = 0.7~1ns Time (ns) 90% 100%
Electrical Characteristics
(TA=25°C unless otherwise specified) Part Number Device Marking V RWM (V) V BR (V) I T (mA) V C @5A Vc I R μA (Max) C (Pf) (Typ.) (Max) (@A) SM712H Pin 3 to Pin 1/Pin 2 7 7.5 1 10 17 36 0.1 75 Pin 1 / Pin 2 to Pin 3 12 13.3 1 19 28 36 0.1 75 H712 Rev : www.leiditech.com 01.06.2018 2/4 SM712H
EIA RS-485 specifies a ±7V ground difference between devices on the bus. This permits the bus voltage to range from +12V (5V + 7V) to -7V (0 - 7V). The SM712H is designed to protect two RS -485 data lines in extended common mode applications. The SM712H may be used to protect devices from transient voltages resulting from ESD, EFT, and light ning. The device is designed with asymmetrical operating voltages for optimum protection. The TVS diodes at pins 1 and 2 have a working voltage of 12volts. These pins are connected to the differential data line pairs. The TVS diodes at pin 3 have a working voltage of 7volts. Pin 3 is connected to ground. The internal TVS diodes of theSM712H will protect the transceiver input from positive transient voltage spikes greater than 12V and negative spikes greater than 7V. ASM712 SM05 SM712H on RS -485 Data Lines Application SM712H SM712H Rev : www.leiditech.com 01.06.2018 3/4
Shanghai Leiditech Electronic Co.,Ltd Email: sale1@leiditech.com Tel : +86- 021 50828806 Fax : +86- 021 50477059 Rev : www.leiditech.com 01.06.2018 4/4 SM712H SYM DIMENSIONS MILLIMETERS INCHES MIN NOM MAX MIN NOM MAX A1 0.00 - - 0.10 0.000 - - 0.004 A2 0.90 - - 1.05 0.035 - - 0.041 E1 2.25 - - 2.55 0.089 0.100 e 0.95TYP 0.037TYP e1 1.80 - - 2.00 0.071 - - 0.079 L 0.55REF 0.022REF L1 0.30 - - 0.50 0.012 - - 0.020 Suggested Land Pattern SYM DIMENSIONS INCHES MILLIMETERS C 0.087 (2.20) E 0.037 0.95 E1 0.075 1.90 G 0.031 0.80 X 0.039 1.00 Y 0.055 1.40 Z 0.141 3.60