SM712.TCT Asymmetrical TVS Diode for Extended Common-Mode RS-485
PROTECTION PRODUCTS
The SM712 transient voltage suppressor (TVS) diode is designed for asymmetrical (12V to -7V ) protection in multi-point data transmission standard RS-485 applications. The SM712 may be used to protect devices from transient voltages resulting from electrostatic discharge (ESD), electrical fast transients (EFT), and lightning.
The SM712 features 400 Watts (tp = 8/20µs) of power handling capability to accommodate the higher transient voltage levels which may be expected in extended common mode applications. This provides higher equipment reliability and eliminates the “guess work” required when using zener diodes that are not rated to handle such transient conditions.
The SM712 replaces four discrete components by integrating two 12V and two 7V TVS diodes in a single package. The integrated design aids in reducing voltage over-shoot associated with trace inductance. The low clamping voltage of the SM712 minimizes the stress on the protected transceiver. The SOT23 package allows flexibility in the design of “crowded” circuit boards.
Features
400 watts peak pulse power (tp = 8/20µs)
Transient protection for asymmetrical data lines to
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 12A (8/20µs) Protects two +12V to -7V lines
Low capacitance
Low clamping voltage
Solid-state silicon avalanche technology
Mechanical Characteristics
JEDEC SOT23 package
Molding compound flammability rating: UL 94V-0
Marking : 712
Packaging : Tape and Reel per EIA 481
Applications
Protection of RS-485 transceivers with extended common-mode range
Security systems
Automatic Teller Machines
HFC systems
Networks
PROTECTION PRODUCTS PROTECTION PRODUCTS
PROTECTION PRODUCTS
Absolute Maximum Rating
| Rating | Symbol | Value | Units |
| Peak Pulse Power (t p = P 8/20µs) | Ppk | 400 | Watts |
| Peak Pulse Current (t p = I 8/20µ) | Ipp | 17 | A |
| L T ead Soldering Temper | Tl | 260 (10 sec.) | °C |
| Operation Temperating | Tj | - 55 to +125 | °C |
| STtorage Temperature | Tstg | -55 to +150 | °C |
Electrical Characteristics
| SM712 |
| | Pins 1 to 3 and 2 to 3 (12V TVS) | Pins 3 to 1 and 3 to 2 (7V TVS) | |
| Parameter | symbol | Conditions | Min | TYP | MAX | MIN | TYP | MAX | Units |
| R V everse Stand-Off Voltage | Vrwm | Pin 3 to 1 or Pin 2 to 1 | | | 12 | | | 7 | V |
| R V everse Breakdown Voltage | Vbr | 1Pr=1Ma | 13.3 | | | 7.5 | | | V |
| Reverse Leaka | Ir | Vr=Vrwm | | | 1 | | | 20 | μA |
| Clamping Voltag | VC | Ipp=5A tp = 8/20µs | | | 20 | | | 10 | |
| Clamping Voltag | VC | I PP = 17A, tp = 8/20µs | | | 26 | | | 12 | |
| Junction Capacita | C1 | VR = 0V, f = 1MH | | | 75 | | | 75 | PF |
| VR = VRWM, 5 f = 1MHz | | 45 | | | 45 | | PF |
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| Part Number | Qty | D/C | Package |
| LTC1559CS-5#TRPBF | 12500 | 17+ | SOIC |
| LTC1560-1IS8#PBF | 12500 | 17+ | SOIC |
| LTC1562ACG#PBF | 12500 | 17+ | SSOP |
| LTC1562ACG#TRPBF | 12500 | 17+ | SSOP |
| LTC1562AIG#PBF | 12500 | 17+ | SSOP |
| LTC1562AIG#TRPBF | 12500 | 17+ | SSOP |
| LTC1562CG#PBF | 12500 | 17+ | SSOP |
| LTC1562CG#TRPBF | 12500 | 17+ | SSOP |
| LTC1562CN#PBF | 12500 | 17+ | PDIP |
| LTC1562IG#PBF | 12500 | 17+ | SSOP |
| LTC1569CS8-7#PBF | 12500 | 17+ | SOIC |
| LTC1574CS#PBF | 12500 | 17+ | SOIC |
| LTC1574CS#TRPBF | 12500 | 17+ | SOIC |
| LTC1574CS-3.3#PBF | 12500 | 17+ | SOIC |
| LTC1574CS-3.3#TRPBF | 12500 | 17+ | SOIC |
| LTC1574CS-5#PBF | 12500 | 17+ | SOIC |
| LTC1574CS-5#TRPBF | 12500 | 17+ | SOIC |
| LTC1588CG#PBF | 12500 | 17+ | SSOP |
| LTC1588CG#TRPBF | 12500 | 17+ | SSOP |
| LTC1588IG#PBF | 12500 | 17+ | SSOP |
| LTC1588IG#TRPBF | 12500 | 17+ | SSOP |
| LTC1589CG#PBF | 12500 | 17+ | SSOP |
| LTC1589CG#TRPBF | 12500 | 17+ | SSOP |
| LTC1589IG#PBF | 12500 | 17+ | SSOP |
| LTC1589IG#TRPBF | 12500 | 17+ | SSOP |
| LTC1605-1IG#TRPBF | 12500 | 17+ | SSOP |
| LTC1605-1IN#PBF | 12500 | 17+ | PDIP |
| LTC1605-2IN#PBF | 12500 | 17+ | PDIP |
| LTC1605ACG#PBF | 12500 | 17+ | SSOP |
| LTC1605IG#PBF | 12500 | 17+ | SSOP |
| LTC1606ACSW#TRPBF | 12500 | 17+ | SOIC |
| LTC1606IG#TRPBF | 12500 | 17+ | SSOP |
| LTC1608IG#PBF | 12500 | 17+ | SSOP |
| LTC1608IG#TRPBF | 12500 | 17+ | SSOP |
| LTC1609ACSW#PBF | 12500 | 17+ | SOIC |
| LTC1623CS8#PBF | 12500 | 17+ | SOIC |
| LTC1623CS8#TRPBF | 12500 | 17+ | SOIC |
| LTC1623IS8#PBF | 12500 | 17+ | SOIC |
| LTC1623IS8#TRPBF | 12500 | 17+ | SOIC |
| LTC1624CS8#TRPBF | 12500 | 17+ | SOIC |
| LTC1628IG#PBF | 12500 | 17+ | SSOP |
| LTC1628IG#TRPBF | 12500 | 17+ | SSOP |
| LTC1628IUH#PBF | 12500 | 17+ | QFN |
| LTC1629CG-PG#PBF | 12500 | 17+ | SSOP |
| LTC1629IG-PG#TRPBF | 12500 | 17+ | SSOP |
| LTC1643AHIGN#PBF | 12500 | 17+ | SSOP |
| LTC1643AHIGN#TRPBF | 12500 | 17+ | SSOP |
| LTC1643AL-1CGN#TRPBF | 12500 | 17+ | SSOP |
| LTC1643ALCGN#PBF | 12500 | 17+ | SSOP |
| LTC1644IGN#PBF | 12500 | 17+ | SSOP |
| LTC1645CS8#TRPBF | 2500 | 17+ | SO-8 |
| LTC1646CGN#PBF | 12500 | 17+ | SSOP |
| LTC1646CGN#TRPBF | 12500 | 17+ | SSOP |
| LTC1647-1IS8#PBF | 12500 | 17+ | SOIC |
| LTC1647-2CS8#PBF | 3680 | 17+ | SOP-8 |
| LTC1647-2IS8#PBF | 12500 | 17+ | SOIC |
| LTC1647-3IGN#TRPBF | 12500 | 17+ | SSOP |
| LTC1650ACS#PBF | 12500 | 17+ | SOIC |
| LTC1650ACS#TRPBF | 12500 | 17+ | SOIC |
| LTC1650CN#PBF | 12500 | 17+ | PDIP |
| LTC1655IS8#TRPBF | 12500 | 17+ | SOIC |
| LTC1657IGN#PBF | 12500 | 17+ | SSOP |
| LTC1657LCGN#TRPBF | 12500 | 17+ | SSOP |
| LTC1657LIGN#TRPBF | 12500 | 17+ | SSOP |
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SM712.TCT Asymmetrical TVS Diode for Extended Common Mode RS-485 Images
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